[xdp-hints] [PATCH bpf-next v3 00/21] XDP metadata via kfuncs for ice

[xdp-hints] [PATCH bpf-next v3 00/21] XDP metadata via kfuncs for ice

[Larysa Zaremba]

This series introduces XDP hints via kfuncs [0] to the ice driver.

Series brings the following existing hints to the ice driver:
 - HW timestamp
 - RX hash with type

Series also introduces new hints and adds their implementation
to ice and veth:
 - VLAN tag with protocol
 - Checksum status

The data above can now be accessed by XDP and userspace (AF_XDP) programs.
They can also be checked with xdp_metadata test and xdp_hw_metadata program.

[0] https://patchwork.kernel.org/project/netdevbpf/cover/20230119221536.3349901-1-sdf@google.com/

v2:
https://lore.kernel.org/bpf/20230703181226.19380-1-larysa.zaremba@intel.com/
v1:
https://lore.kernel.org/all/20230512152607.992209-1-larysa.zaremba@intel.com/

Changes since v2:
- redesign checksum hint, so now it gives full status
- rename vlan_tag -> vlan_tci, where applicable
- use open_netns() and close_netns() in xdp_metadata
- improve VLAN hint documentation
- replace CFI with DEI
- use VLAN_VID_MASK in xdp_metadata
- make vlan_get_tag() return -ENODATA
- remove unused rx_ptype in ice_xsk.c
- fix ice timestamp code division between patches

Changes since v1:
- directly return RX hash, RX timestamp and RX checksum status
  in skb-common functions
- use intermediate enum value for checksum status in ice
- get rid of ring structure dependency in ice kfunc implementation
- make variables const, when possible, in ice implementation
- use -ENODATA instead of -EOPNOTSUPP for driver implementation
- instead of having 2 separate functions for c-tag and s-tag,
  use 1 function that outputs both VLAN tag and protocol ID
- improve documentation for introduced hints
- update xdp_metadata selftest to test new hints
- implement new hints in veth, so they can be tested in xdp_metadata
- parse VLAN tag in xdp_hw_metadata

Aleksander Lobakin (1):
  net, xdp: allow metadata > 32

Larysa Zaremba (20):
  ice: make RX hash reading code more reusable
  ice: make RX HW timestamp reading code more reusable
  ice: make RX checksum checking code more reusable
  ice: Make ptype internal to descriptor info processing
  ice: Introduce ice_xdp_buff
  ice: Support HW timestamp hint
  ice: Support RX hash XDP hint
  ice: Support XDP hints in AF_XDP ZC mode
  xdp: Add VLAN tag hint
  ice: Implement VLAN tag hint
  ice: use VLAN proto from ring packet context in skb path
  xdp: Add checksum hint
  ice: Implement checksum hint
  selftests/bpf: Allow VLAN packets in xdp_hw_metadata
  selftests/bpf: Add flags and new hints to xdp_hw_metadata
  veth: Implement VLAN tag and checksum XDP hint
  net: make vlan_get_tag() return -ENODATA instead of -EINVAL
  selftests/bpf: Use AF_INET for TX in xdp_metadata
  selftests/bpf: Check VLAN tag and proto in xdp_metadata
  selftests/bpf: check checksum state in xdp_metadata

 Documentation/networking/xdp-rx-metadata.rst  |  11 +-
 drivers/net/ethernet/intel/ice/ice.h          |   2 +
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |   2 +-
 .../net/ethernet/intel/ice/ice_lan_tx_rx.h    | 412 +++++++++---------
 drivers/net/ethernet/intel/ice/ice_lib.c      |   2 +-
 drivers/net/ethernet/intel/ice/ice_main.c     |  23 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  27 +-
 drivers/net/ethernet/intel/ice/ice_ptp.h      |  15 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  19 +-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  29 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 346 ++++++++++++---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h |  18 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  26 +-
 drivers/net/veth.c                            |  46 ++
 include/linux/if_vlan.h                       |   4 +-
 include/linux/netdevice.h                     |   5 +
 include/linux/skbuff.h                        |  13 +-
 include/net/xdp.h                             |  58 ++-
 kernel/bpf/offload.c                          |   4 +
 net/core/xdp.c                                |  57 +++
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 213 +++++----
 .../selftests/bpf/progs/xdp_hw_metadata.c     |  47 +-
 .../selftests/bpf/progs/xdp_metadata.c        |  10 +
 tools/testing/selftests/bpf/xdp_hw_metadata.c |  79 +++-
 tools/testing/selftests/bpf/xdp_metadata.h    |  39 +-
 25 files changed, 1063 insertions(+), 444 deletions(-)

-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 01/21] ice: make RX hash reading code more reusable

[Larysa Zaremba]

Previously, we only needed RX hash in skb path,
hence all related code was written with skb in mind.
But with the addition of XDP hints via kfuncs to the ice driver,
the same logic will be needed in .xmo_() callbacks.

Separate generic process of reading RX hash from a descriptor
into a separate function.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 37 +++++++++++++------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index c8322fb6f2b3..8f7f6d78f7bf 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -63,28 +63,43 @@ static enum pkt_hash_types ice_ptype_to_htype(u16 ptype)
 }
 
 /**
- * ice_rx_hash - set the hash value in the skb
+ * ice_get_rx_hash - get RX hash value from descriptor
+ * @rx_desc: specific descriptor
+ *
+ * Returns hash, if present, 0 otherwise.
+ */
+static u32
+ice_get_rx_hash(const union ice_32b_rx_flex_desc *rx_desc)
+{
+	const struct ice_32b_rx_flex_desc_nic *nic_mdid;
+
+	if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC)
+		return 0;
+
+	nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
+	return le32_to_cpu(nic_mdid->rss_hash);
+}
+
+/**
+ * ice_rx_hash_to_skb - set the hash value in the skb
  * @rx_ring: descriptor ring
  * @rx_desc: specific descriptor
  * @skb: pointer to current skb
  * @rx_ptype: the ptype value from the descriptor
  */
 static void
-ice_rx_hash(struct ice_rx_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc,
-	    struct sk_buff *skb, u16 rx_ptype)
+ice_rx_hash_to_skb(const struct ice_rx_ring *rx_ring,
+		   const union ice_32b_rx_flex_desc *rx_desc,
+		   struct sk_buff *skb, u16 rx_ptype)
 {
-	struct ice_32b_rx_flex_desc_nic *nic_mdid;
 	u32 hash;
 
 	if (!(rx_ring->netdev->features & NETIF_F_RXHASH))
 		return;
 
-	if (rx_desc->wb.rxdid != ICE_RXDID_FLEX_NIC)
-		return;
-
-	nic_mdid = (struct ice_32b_rx_flex_desc_nic *)rx_desc;
-	hash = le32_to_cpu(nic_mdid->rss_hash);
-	skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
+	hash = ice_get_rx_hash(rx_desc);
+	if (likely(hash))
+		skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
 }
 
 /**
@@ -186,7 +201,7 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 		       union ice_32b_rx_flex_desc *rx_desc,
 		       struct sk_buff *skb, u16 ptype)
 {
-	ice_rx_hash(rx_ring, rx_desc, skb, ptype);
+	ice_rx_hash_to_skb(rx_ring, rx_desc, skb, ptype);
 
 	/* modifies the skb - consumes the enet header */
 	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 02/21] ice: make RX HW timestamp reading code more reusable

[Larysa Zaremba]

Previously, we only needed RX HW timestamp in skb path,
hence all related code was written with skb in mind.
But with the addition of XDP hints via kfuncs to the ice driver,
the same logic will be needed in .xmo_() callbacks.

Put generic process of reading RX HW timestamp from a descriptor
into a separate function.
Move skb-related code into another source file.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c      | 24 ++++++------------
 drivers/net/ethernet/intel/ice/ice_ptp.h      | 15 ++++++-----
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 25 ++++++++++++++++++-
 3 files changed, 41 insertions(+), 23 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 81d96a40d5a7..a31333972c68 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -2147,30 +2147,24 @@ int ice_ptp_set_ts_config(struct ice_pf *pf, struct ifreq *ifr)
 }
 
 /**
- * ice_ptp_rx_hwtstamp - Check for an Rx timestamp
- * @rx_ring: Ring to get the VSI info
+ * ice_ptp_get_rx_hwts - Get packet Rx timestamp
  * @rx_desc: Receive descriptor
- * @skb: Particular skb to send timestamp with
+ * @cached_time: Cached PHC time
  *
  * The driver receives a notification in the receive descriptor with timestamp.
- * The timestamp is in ns, so we must convert the result first.
  */
-void
-ice_ptp_rx_hwtstamp(struct ice_rx_ring *rx_ring,
-		    union ice_32b_rx_flex_desc *rx_desc, struct sk_buff *skb)
+u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
+			u64 cached_time)
 {
-	struct skb_shared_hwtstamps *hwtstamps;
-	u64 ts_ns, cached_time;
 	u32 ts_high;
+	u64 ts_ns;
 
 	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
-		return;
-
-	cached_time = READ_ONCE(rx_ring->cached_phctime);
+		return 0;
 
 	/* Do not report a timestamp if we don't have a cached PHC time */
 	if (!cached_time)
-		return;
+		return 0;
 
 	/* Use ice_ptp_extend_32b_ts directly, using the ring-specific cached
 	 * PHC value, rather than accessing the PF. This also allows us to
@@ -2181,9 +2175,7 @@ ice_ptp_rx_hwtstamp(struct ice_rx_ring *rx_ring,
 	ts_high = le32_to_cpu(rx_desc->wb.flex_ts.ts_high);
 	ts_ns = ice_ptp_extend_32b_ts(cached_time, ts_high);
 
-	hwtstamps = skb_hwtstamps(skb);
-	memset(hwtstamps, 0, sizeof(*hwtstamps));
-	hwtstamps->hwtstamp = ns_to_ktime(ts_ns);
+	return ts_ns;
 }
 
 /**
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 995a57019ba7..523eefbfdf95 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -268,9 +268,8 @@ void ice_ptp_extts_event(struct ice_pf *pf);
 s8 ice_ptp_request_ts(struct ice_ptp_tx *tx, struct sk_buff *skb);
 enum ice_tx_tstamp_work ice_ptp_process_ts(struct ice_pf *pf);
 
-void
-ice_ptp_rx_hwtstamp(struct ice_rx_ring *rx_ring,
-		    union ice_32b_rx_flex_desc *rx_desc, struct sk_buff *skb);
+u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
+			u64 cached_time);
 void ice_ptp_reset(struct ice_pf *pf);
 void ice_ptp_prepare_for_reset(struct ice_pf *pf);
 void ice_ptp_init(struct ice_pf *pf);
@@ -304,9 +303,13 @@ static inline bool ice_ptp_process_ts(struct ice_pf *pf)
 {
 	return true;
 }
-static inline void
-ice_ptp_rx_hwtstamp(struct ice_rx_ring *rx_ring,
-		    union ice_32b_rx_flex_desc *rx_desc, struct sk_buff *skb) { }
+
+static inline u64
+ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc, u64 cached_time)
+{
+	return 0;
+}
+
 static inline void ice_ptp_reset(struct ice_pf *pf) { }
 static inline void ice_ptp_prepare_for_reset(struct ice_pf *pf) { }
 static inline void ice_ptp_init(struct ice_pf *pf) { }
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 8f7f6d78f7bf..b2f241b73934 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -185,6 +185,29 @@ ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,
 	ring->vsi->back->hw_csum_rx_error++;
 }
 
+/**
+ * ice_ptp_rx_hwts_to_skb - Put RX timestamp into skb
+ * @rx_ring: Ring to get the VSI info
+ * @rx_desc: Receive descriptor
+ * @skb: Particular skb to send timestamp with
+ *
+ * The timestamp is in ns, so we must convert the result first.
+ */
+static void
+ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
+		       const union ice_32b_rx_flex_desc *rx_desc,
+		       struct sk_buff *skb)
+{
+	u64 ts_ns, cached_time;
+
+	cached_time = READ_ONCE(rx_ring->cached_phctime);
+	ts_ns = ice_ptp_get_rx_hwts(rx_desc, cached_time);
+
+	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
+		.hwtstamp	= ns_to_ktime(ts_ns),
+	};
+}
+
 /**
  * ice_process_skb_fields - Populate skb header fields from Rx descriptor
  * @rx_ring: Rx descriptor ring packet is being transacted on
@@ -209,7 +232,7 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 	ice_rx_csum(rx_ring, skb, rx_desc, ptype);
 
 	if (rx_ring->ptp_rx)
-		ice_ptp_rx_hwtstamp(rx_ring, rx_desc, skb);
+		ice_ptp_rx_hwts_to_skb(rx_ring, rx_desc, skb);
 }
 
 /**
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 03/21] ice: make RX checksum checking code more reusable

[Larysa Zaremba]

Previously, we only needed RX checksum flags in skb path,
hence all related code was written with skb in mind.
But with the addition of XDP hints via kfuncs to the ice driver,
the same logic will be needed in .xmo_() callbacks.

Put generic process of determining checksum status into
a separate function.

Now we cannot operate directly on skb, when deducing
checksum status, therefore introduce an intermediate enum for checksum
status. Fortunately, in ice, we have only 4 possibilities: checksum
validated at level 0, validated at level 1, no checksum, checksum error.
Use 3 bits for more convenient conversion.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 105 ++++++++++++------
 1 file changed, 69 insertions(+), 36 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index b2f241b73934..8b155a502b3b 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -102,18 +102,41 @@ ice_rx_hash_to_skb(const struct ice_rx_ring *rx_ring,
 		skb_set_hash(skb, hash, ice_ptype_to_htype(rx_ptype));
 }
 
+enum ice_rx_csum_status {
+	ICE_RX_CSUM_LVL_0	= 0,
+	ICE_RX_CSUM_LVL_1	= BIT(0),
+	ICE_RX_CSUM_NONE	= BIT(1),
+	ICE_RX_CSUM_ERROR	= BIT(2),
+	ICE_RX_CSUM_FAIL	= ICE_RX_CSUM_NONE | ICE_RX_CSUM_ERROR,
+};
+
 /**
- * ice_rx_csum - Indicate in skb if checksum is good
- * @ring: the ring we care about
- * @skb: skb currently being received and modified
+ * ice_rx_csum_lvl - Get checksum level from status
+ * @status: driver-specific checksum status
+ */
+static u8 ice_rx_csum_lvl(enum ice_rx_csum_status status)
+{
+	return status & ICE_RX_CSUM_LVL_1;
+}
+
+/**
+ * ice_rx_csum_ip_summed - Checksum status from driver-specific to generic
+ * @status: driver-specific checksum status
+ */
+static u8 ice_rx_csum_ip_summed(enum ice_rx_csum_status status)
+{
+	return status & ICE_RX_CSUM_NONE ? CHECKSUM_NONE : CHECKSUM_UNNECESSARY;
+}
+
+/**
+ * ice_get_rx_csum_status - Deduce checksum status from descriptor
  * @rx_desc: the receive descriptor
  * @ptype: the packet type decoded by hardware
  *
- * skb->protocol must be set before this function is called
+ * Returns driver-specific checksum status
  */
-static void
-ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,
-	    union ice_32b_rx_flex_desc *rx_desc, u16 ptype)
+static enum ice_rx_csum_status
+ice_get_rx_csum_status(const union ice_32b_rx_flex_desc *rx_desc, u16 ptype)
 {
 	struct ice_rx_ptype_decoded decoded;
 	u16 rx_status0, rx_status1;
@@ -124,20 +147,12 @@ ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,
 
 	decoded = ice_decode_rx_desc_ptype(ptype);
 
-	/* Start with CHECKSUM_NONE and by default csum_level = 0 */
-	skb->ip_summed = CHECKSUM_NONE;
-	skb_checksum_none_assert(skb);
-
-	/* check if Rx checksum is enabled */
-	if (!(ring->netdev->features & NETIF_F_RXCSUM))
-		return;
-
 	/* check if HW has decoded the packet and checksum */
 	if (!(rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_L3L4P_S)))
-		return;
+		return ICE_RX_CSUM_NONE;
 
 	if (!(decoded.known && decoded.outer_ip))
-		return;
+		return ICE_RX_CSUM_NONE;
 
 	ipv4 = (decoded.outer_ip == ICE_RX_PTYPE_OUTER_IP) &&
 	       (decoded.outer_ip_ver == ICE_RX_PTYPE_OUTER_IPV4);
@@ -146,43 +161,61 @@ ice_rx_csum(struct ice_rx_ring *ring, struct sk_buff *skb,
 
 	if (ipv4 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_IPE_S) |
 				   BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EIPE_S))))
-		goto checksum_fail;
+		return ICE_RX_CSUM_FAIL;
 
 	if (ipv6 && (rx_status0 & (BIT(ICE_RX_FLEX_DESC_STATUS0_IPV6EXADD_S))))
-		goto checksum_fail;
+		return ICE_RX_CSUM_FAIL;
 
 	/* check for L4 errors and handle packets that were not able to be
 	 * checksummed due to arrival speed
 	 */
 	if (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_L4E_S))
-		goto checksum_fail;
+		return ICE_RX_CSUM_FAIL;
 
 	/* check for outer UDP checksum error in tunneled packets */
 	if ((rx_status1 & BIT(ICE_RX_FLEX_DESC_STATUS1_NAT_S)) &&
 	    (rx_status0 & BIT(ICE_RX_FLEX_DESC_STATUS0_XSUM_EUDPE_S)))
-		goto checksum_fail;
-
-	/* If there is an outer header present that might contain a checksum
-	 * we need to bump the checksum level by 1 to reflect the fact that
-	 * we are indicating we validated the inner checksum.
-	 */
-	if (decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT)
-		skb->csum_level = 1;
+		return ICE_RX_CSUM_FAIL;
 
 	/* Only report checksum unnecessary for TCP, UDP, or SCTP */
 	switch (decoded.inner_prot) {
 	case ICE_RX_PTYPE_INNER_PROT_TCP:
 	case ICE_RX_PTYPE_INNER_PROT_UDP:
 	case ICE_RX_PTYPE_INNER_PROT_SCTP:
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-		break;
-	default:
-		break;
+		/* If there is an outer header present that might contain
+		 * a checksum we need to bump the checksum level by 1 to reflect
+		 * the fact that we have validated the inner checksum.
+		 */
+		return decoded.tunnel_type >= ICE_RX_PTYPE_TUNNEL_IP_GRENAT ?
+		       ICE_RX_CSUM_LVL_1 : ICE_RX_CSUM_LVL_0;
 	}
-	return;
 
-checksum_fail:
-	ring->vsi->back->hw_csum_rx_error++;
+	return ICE_RX_CSUM_NONE;
+}
+
+/**
+ * ice_rx_csum_into_skb - Indicate in skb if checksum is good
+ * @ring: the ring we care about
+ * @skb: skb currently being received and modified
+ * @rx_desc: the receive descriptor
+ * @ptype: the packet type decoded by hardware
+ */
+static void
+ice_rx_csum_into_skb(struct ice_rx_ring *ring, struct sk_buff *skb,
+		     const union ice_32b_rx_flex_desc *rx_desc, u16 ptype)
+{
+	enum ice_rx_csum_status csum_status;
+
+	/* check if Rx checksum is enabled */
+	if (!(ring->netdev->features & NETIF_F_RXCSUM))
+		return;
+
+	csum_status = ice_get_rx_csum_status(rx_desc, ptype);
+	if (csum_status & ICE_RX_CSUM_ERROR)
+		ring->vsi->back->hw_csum_rx_error++;
+
+	skb->ip_summed = ice_rx_csum_ip_summed(csum_status);
+	skb->csum_level = ice_rx_csum_lvl(csum_status);
 }
 
 /**
@@ -229,7 +262,7 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 	/* modifies the skb - consumes the enet header */
 	skb->protocol = eth_type_trans(skb, rx_ring->netdev);
 
-	ice_rx_csum(rx_ring, skb, rx_desc, ptype);
+	ice_rx_csum_into_skb(rx_ring, skb, rx_desc, ptype);
 
 	if (rx_ring->ptp_rx)
 		ice_ptp_rx_hwts_to_skb(rx_ring, rx_desc, skb);
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 04/21] ice: Make ptype internal to descriptor info processing

[Larysa Zaremba]

Currently, rx_ptype variable is used only as an argument
to ice_process_skb_fields() and is computed
just before the function call.

Therefore, there is no reason to pass this value as an argument.
Instead, remove this argument and compute the value directly inside
ice_process_skb_fields() function.

Also, separate its calculation into a short function, so the code
can later be reused in .xmo_() callbacks.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  6 +-----
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 15 +++++++++++++--
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h |  2 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  6 +-----
 4 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 52d0a126eb61..40f2f6dabb81 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1181,7 +1181,6 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 		unsigned int size;
 		u16 stat_err_bits;
 		u16 vlan_tag = 0;
-		u16 rx_ptype;
 
 		/* get the Rx desc from Rx ring based on 'next_to_clean' */
 		rx_desc = ICE_RX_DESC(rx_ring, ntc);
@@ -1286,10 +1285,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 		total_rx_bytes += skb->len;
 
 		/* populate checksum, VLAN, and protocol */
-		rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &
-			ICE_RX_FLEX_DESC_PTYPE_M;
-
-		ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
+		ice_process_skb_fields(rx_ring, rx_desc, skb);
 
 		ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb);
 		/* send completed skb up the stack */
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 8b155a502b3b..07241f4229b7 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -241,12 +241,21 @@ ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
 	};
 }
 
+/**
+ * ice_get_ptype - Read HW packet type from the descriptor
+ * @rx_desc: RX descriptor
+ */
+static u16 ice_get_ptype(const union ice_32b_rx_flex_desc *rx_desc)
+{
+	return le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &
+	       ICE_RX_FLEX_DESC_PTYPE_M;
+}
+
 /**
  * ice_process_skb_fields - Populate skb header fields from Rx descriptor
  * @rx_ring: Rx descriptor ring packet is being transacted on
  * @rx_desc: pointer to the EOP Rx descriptor
  * @skb: pointer to current skb being populated
- * @ptype: the packet type decoded by hardware
  *
  * This function checks the ring, descriptor, and packet information in
  * order to populate the hash, checksum, VLAN, protocol, and
@@ -255,8 +264,10 @@ ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
 void
 ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 		       union ice_32b_rx_flex_desc *rx_desc,
-		       struct sk_buff *skb, u16 ptype)
+		       struct sk_buff *skb)
 {
+	u16 ptype = ice_get_ptype(rx_desc);
+
 	ice_rx_hash_to_skb(rx_ring, rx_desc, skb, ptype);
 
 	/* modifies the skb - consumes the enet header */
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
index 115969ecdf7b..e1d49e1235b3 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
@@ -148,7 +148,7 @@ void ice_release_rx_desc(struct ice_rx_ring *rx_ring, u16 val);
 void
 ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 		       union ice_32b_rx_flex_desc *rx_desc,
-		       struct sk_buff *skb, u16 ptype);
+		       struct sk_buff *skb);
 void
 ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag);
 #endif /* !_ICE_TXRX_LIB_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index a7fe2b4ce655..4212172a758d 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -781,7 +781,6 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
 		struct sk_buff *skb;
 		u16 stat_err_bits;
 		u16 vlan_tag = 0;
-		u16 rx_ptype;
 
 		rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean);
 
@@ -851,10 +850,7 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
 
 		vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
 
-		rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &
-				       ICE_RX_FLEX_DESC_PTYPE_M;
-
-		ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
+		ice_process_skb_fields(rx_ring, rx_desc, skb);
 		ice_receive_skb(rx_ring, skb, vlan_tag);
 	}
 
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 05/21] ice: Introduce ice_xdp_buff

[Larysa Zaremba]

In order to use XDP hints via kfuncs we need to put
RX descriptor and ring pointers just next to xdp_buff.
Same as in hints implementations in other drivers, we archieve
this through putting xdp_buff into a child structure.

Currently, xdp_buff is stored in the ring structure,
so replace it with union that includes child structure.
This way enough memory is available while existing XDP code
remains isolated from hints.

Minimum size of the new child structure (ice_xdp_buff) is exactly
64 bytes (single cache line). To place it at the start of a cache line,
move 'next' field from CL1 to CL3, as it isn't used often. This still
leaves 128 bits available in CL3 for packet context extensions.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  7 +++--
 drivers/net/ethernet/intel/ice/ice_txrx.h     | 26 ++++++++++++++++---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 10 +++++++
 3 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 40f2f6dabb81..4e6546d9cf85 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -557,13 +557,14 @@ ice_rx_frame_truesize(struct ice_rx_ring *rx_ring, const unsigned int size)
  * @xdp_prog: XDP program to run
  * @xdp_ring: ring to be used for XDP_TX action
  * @rx_buf: Rx buffer to store the XDP action
+ * @eop_desc: Last descriptor in packet to read metadata from
  *
  * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
  */
 static void
 ice_run_xdp(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
 	    struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring,
-	    struct ice_rx_buf *rx_buf)
+	    struct ice_rx_buf *rx_buf, union ice_32b_rx_flex_desc *eop_desc)
 {
 	unsigned int ret = ICE_XDP_PASS;
 	u32 act;
@@ -571,6 +572,8 @@ ice_run_xdp(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
 	if (!xdp_prog)
 		goto exit;
 
+	ice_xdp_meta_set_desc(xdp, eop_desc);
+
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
 	switch (act) {
 	case XDP_PASS:
@@ -1240,7 +1243,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 		if (ice_is_non_eop(rx_ring, rx_desc))
 			continue;
 
-		ice_run_xdp(rx_ring, xdp, xdp_prog, xdp_ring, rx_buf);
+		ice_run_xdp(rx_ring, xdp, xdp_prog, xdp_ring, rx_buf, rx_desc);
 		if (rx_buf->act == ICE_XDP_PASS)
 			goto construct_skb;
 		total_rx_bytes += xdp_get_buff_len(xdp);
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 166413fc33f4..d0ab2c4c0c91 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -257,6 +257,18 @@ enum ice_rx_dtype {
 	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
 };
 
+struct ice_pkt_ctx {
+	const union ice_32b_rx_flex_desc *eop_desc;
+};
+
+struct ice_xdp_buff {
+	struct xdp_buff xdp_buff;
+	struct ice_pkt_ctx pkt_ctx;
+};
+
+/* Required for compatibility with xdp_buffs from xsk_pool */
+static_assert(offsetof(struct ice_xdp_buff, xdp_buff) == 0);
+
 /* indices into GLINT_ITR registers */
 #define ICE_RX_ITR	ICE_IDX_ITR0
 #define ICE_TX_ITR	ICE_IDX_ITR1
@@ -298,7 +310,6 @@ enum ice_dynamic_itr {
 /* descriptor ring, associated with a VSI */
 struct ice_rx_ring {
 	/* CL1 - 1st cacheline starts here */
-	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
 	void *desc;			/* Descriptor ring memory */
 	struct device *dev;		/* Used for DMA mapping */
 	struct net_device *netdev;	/* netdev ring maps to */
@@ -310,12 +321,19 @@ struct ice_rx_ring {
 	u16 count;			/* Number of descriptors */
 	u16 reg_idx;			/* HW register index of the ring */
 	u16 next_to_alloc;
-	/* CL2 - 2nd cacheline starts here */
+
 	union {
 		struct ice_rx_buf *rx_buf;
 		struct xdp_buff **xdp_buf;
 	};
-	struct xdp_buff xdp;
+	/* CL2 - 2nd cacheline starts here */
+	union {
+		struct ice_xdp_buff xdp_ext;
+		struct {
+			struct xdp_buff xdp;
+			struct ice_pkt_ctx pkt_ctx;
+		};
+	};
 	/* CL3 - 3rd cacheline starts here */
 	struct bpf_prog *xdp_prog;
 	u16 rx_offset;
@@ -325,6 +343,8 @@ struct ice_rx_ring {
 	u16 next_to_clean;
 	u16 first_desc;
 
+	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
+
 	/* stats structs */
 	struct ice_ring_stats *ring_stats;
 
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
index e1d49e1235b3..145883eec129 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
@@ -151,4 +151,14 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 		       struct sk_buff *skb);
 void
 ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag);
+
+static inline void
+ice_xdp_meta_set_desc(struct xdp_buff *xdp,
+		      union ice_32b_rx_flex_desc *eop_desc)
+{
+	struct ice_xdp_buff *xdp_ext = container_of(xdp, struct ice_xdp_buff,
+						    xdp_buff);
+
+	xdp_ext->pkt_ctx.eop_desc = eop_desc;
+}
 #endif /* !_ICE_TXRX_LIB_H_ */
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 06/21] ice: Support HW timestamp hint

[Larysa Zaremba]

Use previously refactored code and create a function
that allows XDP code to read HW timestamp.

Also, move cached_phctime into packet context, this way this data still
stays in the ring structure, just at the different address.

HW timestamp is the first supported hint in the driver,
so also add xdp_metadata_ops.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice.h          |  2 ++
 drivers/net/ethernet/intel/ice/ice_ethtool.c  |  2 +-
 drivers/net/ethernet/intel/ice/ice_lib.c      |  2 +-
 drivers/net/ethernet/intel/ice/ice_main.c     |  1 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  3 ++-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  2 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 26 ++++++++++++++++++-
 7 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 4ba3d99439a0..7a973a2229f1 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -943,4 +943,6 @@ static inline void ice_clear_rdma_cap(struct ice_pf *pf)
 	set_bit(ICE_FLAG_UNPLUG_AUX_DEV, pf->flags);
 	clear_bit(ICE_FLAG_RDMA_ENA, pf->flags);
 }
+
+extern const struct xdp_metadata_ops ice_xdp_md_ops;
 #endif /* _ICE_H_ */
diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 8d5cbbd0b3d5..3c3b9cbfbcd3 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -2837,7 +2837,7 @@ ice_set_ringparam(struct net_device *netdev, struct ethtool_ringparam *ring,
 		/* clone ring and setup updated count */
 		rx_rings[i] = *vsi->rx_rings[i];
 		rx_rings[i].count = new_rx_cnt;
-		rx_rings[i].cached_phctime = pf->ptp.cached_phc_time;
+		rx_rings[i].pkt_ctx.cached_phctime = pf->ptp.cached_phc_time;
 		rx_rings[i].desc = NULL;
 		rx_rings[i].rx_buf = NULL;
 		/* this is to allow wr32 to have something to write to
diff --git a/drivers/net/ethernet/intel/ice/ice_lib.c b/drivers/net/ethernet/intel/ice/ice_lib.c
index 00e3afd507a4..eb69b0ac7956 100644
--- a/drivers/net/ethernet/intel/ice/ice_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_lib.c
@@ -1445,7 +1445,7 @@ static int ice_vsi_alloc_rings(struct ice_vsi *vsi)
 		ring->netdev = vsi->netdev;
 		ring->dev = dev;
 		ring->count = vsi->num_rx_desc;
-		ring->cached_phctime = pf->ptp.cached_phc_time;
+		ring->pkt_ctx.cached_phctime = pf->ptp.cached_phc_time;
 		WRITE_ONCE(vsi->rx_rings[i], ring);
 	}
 
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 19a5e7f3a075..dac523d5e579 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3384,6 +3384,7 @@ static void ice_set_ops(struct ice_vsi *vsi)
 
 	netdev->netdev_ops = &ice_netdev_ops;
 	netdev->udp_tunnel_nic_info = &pf->hw.udp_tunnel_nic;
+	netdev->xdp_metadata_ops = &ice_xdp_md_ops;
 	ice_set_ethtool_ops(netdev);
 
 	if (vsi->type != ICE_VSI_PF)
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index a31333972c68..26fad7038996 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -1038,7 +1038,8 @@ static int ice_ptp_update_cached_phctime(struct ice_pf *pf)
 		ice_for_each_rxq(vsi, j) {
 			if (!vsi->rx_rings[j])
 				continue;
-			WRITE_ONCE(vsi->rx_rings[j]->cached_phctime, systime);
+			WRITE_ONCE(vsi->rx_rings[j]->pkt_ctx.cached_phctime,
+				   systime);
 		}
 	}
 	clear_bit(ICE_CFG_BUSY, pf->state);
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index d0ab2c4c0c91..4237702a58a9 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -259,6 +259,7 @@ enum ice_rx_dtype {
 
 struct ice_pkt_ctx {
 	const union ice_32b_rx_flex_desc *eop_desc;
+	u64 cached_phctime;
 };
 
 struct ice_xdp_buff {
@@ -354,7 +355,6 @@ struct ice_rx_ring {
 	struct ice_tx_ring *xdp_ring;
 	struct xsk_buff_pool *xsk_pool;
 	dma_addr_t dma;			/* physical address of ring */
-	u64 cached_phctime;
 	u16 rx_buf_len;
 	u8 dcb_tc;			/* Traffic class of ring */
 	u8 ptp_rx;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 07241f4229b7..463d9e5cbe05 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -233,7 +233,7 @@ ice_ptp_rx_hwts_to_skb(struct ice_rx_ring *rx_ring,
 {
 	u64 ts_ns, cached_time;
 
-	cached_time = READ_ONCE(rx_ring->cached_phctime);
+	cached_time = READ_ONCE(rx_ring->pkt_ctx.cached_phctime);
 	ts_ns = ice_ptp_get_rx_hwts(rx_desc, cached_time);
 
 	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
@@ -546,3 +546,27 @@ void ice_finalize_xdp_rx(struct ice_tx_ring *xdp_ring, unsigned int xdp_res,
 			spin_unlock(&xdp_ring->tx_lock);
 	}
 }
+
+/**
+ * ice_xdp_rx_hw_ts - HW timestamp XDP hint handler
+ * @ctx: XDP buff pointer
+ * @ts_ns: destination address
+ *
+ * Copy HW timestamp (if available) to the destination address.
+ */
+static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns)
+{
+	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+	u64 cached_time;
+
+	cached_time = READ_ONCE(xdp_ext->pkt_ctx.cached_phctime);
+	*ts_ns = ice_ptp_get_rx_hwts(xdp_ext->pkt_ctx.eop_desc, cached_time);
+	if (!*ts_ns)
+		return -ENODATA;
+
+	return 0;
+}
+
+const struct xdp_metadata_ops ice_xdp_md_ops = {
+	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
+};
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 07/21] ice: Support RX hash XDP hint

[Larysa Zaremba]

RX hash XDP hint requests both hash value and type.
Type is XDP-specific, so we need a separate way to map
these values to the hardware ptypes, so create a lookup table.

Instead of creating a new long list, reuse contents
of ice_decode_rx_desc_ptype[] through preprocessor.

Current hash type enum does not contain ICMP packet type,
but ice devices support it, so also add a new type into core code.

Then use previously refactored code and create a function
that allows XDP code to read RX hash.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../net/ethernet/intel/ice/ice_lan_tx_rx.h    | 412 +++++++++---------
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c |  73 ++++
 include/net/xdp.h                             |   3 +
 3 files changed, 284 insertions(+), 204 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h b/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h
index 89f986a75cc8..d384ddfcb83e 100644
--- a/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h
+++ b/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h
@@ -673,6 +673,212 @@ struct ice_tlan_ctx {
  *      Use the enum ice_rx_l2_ptype to decode the packet type
  * ENDIF
  */
+#define ICE_PTYPES								\
+	/* L2 Packet types */							\
+	ICE_PTT_UNUSED_ENTRY(0),						\
+	ICE_PTT(1, L2, NONE, NOF, NONE, NONE, NOF, NONE, PAY2),			\
+	ICE_PTT_UNUSED_ENTRY(2),						\
+	ICE_PTT_UNUSED_ENTRY(3),						\
+	ICE_PTT_UNUSED_ENTRY(4),						\
+	ICE_PTT_UNUSED_ENTRY(5),						\
+	ICE_PTT(6, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),			\
+	ICE_PTT(7, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),			\
+	ICE_PTT_UNUSED_ENTRY(8),						\
+	ICE_PTT_UNUSED_ENTRY(9),						\
+	ICE_PTT(10, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),		\
+	ICE_PTT(11, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),		\
+	ICE_PTT_UNUSED_ENTRY(12),						\
+	ICE_PTT_UNUSED_ENTRY(13),						\
+	ICE_PTT_UNUSED_ENTRY(14),						\
+	ICE_PTT_UNUSED_ENTRY(15),						\
+	ICE_PTT_UNUSED_ENTRY(16),						\
+	ICE_PTT_UNUSED_ENTRY(17),						\
+	ICE_PTT_UNUSED_ENTRY(18),						\
+	ICE_PTT_UNUSED_ENTRY(19),						\
+	ICE_PTT_UNUSED_ENTRY(20),						\
+	ICE_PTT_UNUSED_ENTRY(21),						\
+										\
+	/* Non Tunneled IPv4 */							\
+	ICE_PTT(22, IP, IPV4, FRG, NONE, NONE, NOF, NONE, PAY3),		\
+	ICE_PTT(23, IP, IPV4, NOF, NONE, NONE, NOF, NONE, PAY3),		\
+	ICE_PTT(24, IP, IPV4, NOF, NONE, NONE, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(25),						\
+	ICE_PTT(26, IP, IPV4, NOF, NONE, NONE, NOF, TCP,  PAY4),		\
+	ICE_PTT(27, IP, IPV4, NOF, NONE, NONE, NOF, SCTP, PAY4),		\
+	ICE_PTT(28, IP, IPV4, NOF, NONE, NONE, NOF, ICMP, PAY4),		\
+										\
+	/* IPv4 --> IPv4 */							\
+	ICE_PTT(29, IP, IPV4, NOF, IP_IP, IPV4, FRG, NONE, PAY3),		\
+	ICE_PTT(30, IP, IPV4, NOF, IP_IP, IPV4, NOF, NONE, PAY3),		\
+	ICE_PTT(31, IP, IPV4, NOF, IP_IP, IPV4, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(32),						\
+	ICE_PTT(33, IP, IPV4, NOF, IP_IP, IPV4, NOF, TCP,  PAY4),		\
+	ICE_PTT(34, IP, IPV4, NOF, IP_IP, IPV4, NOF, SCTP, PAY4),		\
+	ICE_PTT(35, IP, IPV4, NOF, IP_IP, IPV4, NOF, ICMP, PAY4),		\
+										\
+	/* IPv4 --> IPv6 */							\
+	ICE_PTT(36, IP, IPV4, NOF, IP_IP, IPV6, FRG, NONE, PAY3),		\
+	ICE_PTT(37, IP, IPV4, NOF, IP_IP, IPV6, NOF, NONE, PAY3),		\
+	ICE_PTT(38, IP, IPV4, NOF, IP_IP, IPV6, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(39),						\
+	ICE_PTT(40, IP, IPV4, NOF, IP_IP, IPV6, NOF, TCP,  PAY4),		\
+	ICE_PTT(41, IP, IPV4, NOF, IP_IP, IPV6, NOF, SCTP, PAY4),		\
+	ICE_PTT(42, IP, IPV4, NOF, IP_IP, IPV6, NOF, ICMP, PAY4),		\
+										\
+	/* IPv4 --> GRE/NAT */							\
+	ICE_PTT(43, IP, IPV4, NOF, IP_GRENAT, NONE, NOF, NONE, PAY3),		\
+										\
+	/* IPv4 --> GRE/NAT --> IPv4 */						\
+	ICE_PTT(44, IP, IPV4, NOF, IP_GRENAT, IPV4, FRG, NONE, PAY3),		\
+	ICE_PTT(45, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, NONE, PAY3),		\
+	ICE_PTT(46, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(47),						\
+	ICE_PTT(48, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, TCP,  PAY4),		\
+	ICE_PTT(49, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, SCTP, PAY4),		\
+	ICE_PTT(50, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, ICMP, PAY4),		\
+										\
+	/* IPv4 --> GRE/NAT --> IPv6 */						\
+	ICE_PTT(51, IP, IPV4, NOF, IP_GRENAT, IPV6, FRG, NONE, PAY3),		\
+	ICE_PTT(52, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, NONE, PAY3),		\
+	ICE_PTT(53, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(54),						\
+	ICE_PTT(55, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, TCP,  PAY4),		\
+	ICE_PTT(56, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, SCTP, PAY4),		\
+	ICE_PTT(57, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, ICMP, PAY4),		\
+										\
+	/* IPv4 --> GRE/NAT --> MAC */						\
+	ICE_PTT(58, IP, IPV4, NOF, IP_GRENAT_MAC, NONE, NOF, NONE, PAY3),	\
+										\
+	/* IPv4 --> GRE/NAT --> MAC --> IPv4 */					\
+	ICE_PTT(59, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, FRG, NONE, PAY3),	\
+	ICE_PTT(60, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, NONE, PAY3),	\
+	ICE_PTT(61, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(62),						\
+	ICE_PTT(63, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, TCP,  PAY4),	\
+	ICE_PTT(64, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, SCTP, PAY4),	\
+	ICE_PTT(65, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, ICMP, PAY4),	\
+										\
+	/* IPv4 --> GRE/NAT -> MAC --> IPv6 */					\
+	ICE_PTT(66, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, FRG, NONE, PAY3),	\
+	ICE_PTT(67, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, NONE, PAY3),	\
+	ICE_PTT(68, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(69),						\
+	ICE_PTT(70, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, TCP,  PAY4),	\
+	ICE_PTT(71, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, SCTP, PAY4),	\
+	ICE_PTT(72, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, ICMP, PAY4),	\
+										\
+	/* IPv4 --> GRE/NAT --> MAC/VLAN */					\
+	ICE_PTT(73, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, NONE, NOF, NONE, PAY3),	\
+										\
+	/* IPv4 ---> GRE/NAT -> MAC/VLAN --> IPv4 */				\
+	ICE_PTT(74, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, FRG, NONE, PAY3),	\
+	ICE_PTT(75, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, NONE, PAY3),	\
+	ICE_PTT(76, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(77),						\
+	ICE_PTT(78, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, TCP,  PAY4),	\
+	ICE_PTT(79, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, SCTP, PAY4),	\
+	ICE_PTT(80, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, ICMP, PAY4),	\
+										\
+	/* IPv4 -> GRE/NAT -> MAC/VLAN --> IPv6 */				\
+	ICE_PTT(81, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, FRG, NONE, PAY3),	\
+	ICE_PTT(82, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, NONE, PAY3),	\
+	ICE_PTT(83, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(84),						\
+	ICE_PTT(85, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, TCP,  PAY4),	\
+	ICE_PTT(86, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, SCTP, PAY4),	\
+	ICE_PTT(87, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, ICMP, PAY4),	\
+										\
+	/* Non Tunneled IPv6 */							\
+	ICE_PTT(88, IP, IPV6, FRG, NONE, NONE, NOF, NONE, PAY3),		\
+	ICE_PTT(89, IP, IPV6, NOF, NONE, NONE, NOF, NONE, PAY3),		\
+	ICE_PTT(90, IP, IPV6, NOF, NONE, NONE, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(91),						\
+	ICE_PTT(92, IP, IPV6, NOF, NONE, NONE, NOF, TCP,  PAY4),		\
+	ICE_PTT(93, IP, IPV6, NOF, NONE, NONE, NOF, SCTP, PAY4),		\
+	ICE_PTT(94, IP, IPV6, NOF, NONE, NONE, NOF, ICMP, PAY4),		\
+										\
+	/* IPv6 --> IPv4 */							\
+	ICE_PTT(95, IP, IPV6, NOF, IP_IP, IPV4, FRG, NONE, PAY3),		\
+	ICE_PTT(96, IP, IPV6, NOF, IP_IP, IPV4, NOF, NONE, PAY3),		\
+	ICE_PTT(97, IP, IPV6, NOF, IP_IP, IPV4, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(98),						\
+	ICE_PTT(99, IP, IPV6, NOF, IP_IP, IPV4, NOF, TCP,  PAY4),		\
+	ICE_PTT(100, IP, IPV6, NOF, IP_IP, IPV4, NOF, SCTP, PAY4),		\
+	ICE_PTT(101, IP, IPV6, NOF, IP_IP, IPV4, NOF, ICMP, PAY4),		\
+										\
+	/* IPv6 --> IPv6 */							\
+	ICE_PTT(102, IP, IPV6, NOF, IP_IP, IPV6, FRG, NONE, PAY3),		\
+	ICE_PTT(103, IP, IPV6, NOF, IP_IP, IPV6, NOF, NONE, PAY3),		\
+	ICE_PTT(104, IP, IPV6, NOF, IP_IP, IPV6, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(105),						\
+	ICE_PTT(106, IP, IPV6, NOF, IP_IP, IPV6, NOF, TCP,  PAY4),		\
+	ICE_PTT(107, IP, IPV6, NOF, IP_IP, IPV6, NOF, SCTP, PAY4),		\
+	ICE_PTT(108, IP, IPV6, NOF, IP_IP, IPV6, NOF, ICMP, PAY4),		\
+										\
+	/* IPv6 --> GRE/NAT */							\
+	ICE_PTT(109, IP, IPV6, NOF, IP_GRENAT, NONE, NOF, NONE, PAY3),		\
+										\
+	/* IPv6 --> GRE/NAT -> IPv4 */						\
+	ICE_PTT(110, IP, IPV6, NOF, IP_GRENAT, IPV4, FRG, NONE, PAY3),		\
+	ICE_PTT(111, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, NONE, PAY3),		\
+	ICE_PTT(112, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(113),						\
+	ICE_PTT(114, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, TCP,  PAY4),		\
+	ICE_PTT(115, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, SCTP, PAY4),		\
+	ICE_PTT(116, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, ICMP, PAY4),		\
+										\
+	/* IPv6 --> GRE/NAT -> IPv6 */						\
+	ICE_PTT(117, IP, IPV6, NOF, IP_GRENAT, IPV6, FRG, NONE, PAY3),		\
+	ICE_PTT(118, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, NONE, PAY3),		\
+	ICE_PTT(119, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, UDP,  PAY4),		\
+	ICE_PTT_UNUSED_ENTRY(120),						\
+	ICE_PTT(121, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, TCP,  PAY4),		\
+	ICE_PTT(122, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, SCTP, PAY4),		\
+	ICE_PTT(123, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, ICMP, PAY4),		\
+										\
+	/* IPv6 --> GRE/NAT -> MAC */						\
+	ICE_PTT(124, IP, IPV6, NOF, IP_GRENAT_MAC, NONE, NOF, NONE, PAY3),	\
+										\
+	/* IPv6 --> GRE/NAT -> MAC -> IPv4 */					\
+	ICE_PTT(125, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, FRG, NONE, PAY3),	\
+	ICE_PTT(126, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, NONE, PAY3),	\
+	ICE_PTT(127, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(128),						\
+	ICE_PTT(129, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, TCP,  PAY4),	\
+	ICE_PTT(130, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, SCTP, PAY4),	\
+	ICE_PTT(131, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, ICMP, PAY4),	\
+										\
+	/* IPv6 --> GRE/NAT -> MAC -> IPv6 */					\
+	ICE_PTT(132, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, FRG, NONE, PAY3),	\
+	ICE_PTT(133, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, NONE, PAY3),	\
+	ICE_PTT(134, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(135),						\
+	ICE_PTT(136, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, TCP,  PAY4),	\
+	ICE_PTT(137, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, SCTP, PAY4),	\
+	ICE_PTT(138, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, ICMP, PAY4),	\
+										\
+	/* IPv6 --> GRE/NAT -> MAC/VLAN */					\
+	ICE_PTT(139, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, NONE, NOF, NONE, PAY3),	\
+										\
+	/* IPv6 --> GRE/NAT -> MAC/VLAN --> IPv4 */				\
+	ICE_PTT(140, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, FRG, NONE, PAY3),	\
+	ICE_PTT(141, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, NONE, PAY3),	\
+	ICE_PTT(142, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(143),						\
+	ICE_PTT(144, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, TCP,  PAY4),	\
+	ICE_PTT(145, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, SCTP, PAY4),	\
+	ICE_PTT(146, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, ICMP, PAY4),	\
+										\
+	/* IPv6 --> GRE/NAT -> MAC/VLAN --> IPv6 */				\
+	ICE_PTT(147, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, FRG, NONE, PAY3),	\
+	ICE_PTT(148, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, NONE, PAY3),	\
+	ICE_PTT(149, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, UDP,  PAY4),	\
+	ICE_PTT_UNUSED_ENTRY(150),						\
+	ICE_PTT(151, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, TCP,  PAY4),	\
+	ICE_PTT(152, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, SCTP, PAY4),	\
+	ICE_PTT(153, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, ICMP, PAY4),
+
+#define ICE_NUM_DEFINED_PTYPES	154
 
 /* macro to make the table lines short, use explicit indexing with [PTYPE] */
 #define ICE_PTT(PTYPE, OUTER_IP, OUTER_IP_VER, OUTER_FRAG, T, TE, TEF, I, PL)\
@@ -695,212 +901,10 @@ struct ice_tlan_ctx {
 
 /* Lookup table mapping in the 10-bit HW PTYPE to the bit field for decoding */
 static const struct ice_rx_ptype_decoded ice_ptype_lkup[BIT(10)] = {
-	/* L2 Packet types */
-	ICE_PTT_UNUSED_ENTRY(0),
-	ICE_PTT(1, L2, NONE, NOF, NONE, NONE, NOF, NONE, PAY2),
-	ICE_PTT_UNUSED_ENTRY(2),
-	ICE_PTT_UNUSED_ENTRY(3),
-	ICE_PTT_UNUSED_ENTRY(4),
-	ICE_PTT_UNUSED_ENTRY(5),
-	ICE_PTT(6, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),
-	ICE_PTT(7, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),
-	ICE_PTT_UNUSED_ENTRY(8),
-	ICE_PTT_UNUSED_ENTRY(9),
-	ICE_PTT(10, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),
-	ICE_PTT(11, L2, NONE, NOF, NONE, NONE, NOF, NONE, NONE),
-	ICE_PTT_UNUSED_ENTRY(12),
-	ICE_PTT_UNUSED_ENTRY(13),
-	ICE_PTT_UNUSED_ENTRY(14),
-	ICE_PTT_UNUSED_ENTRY(15),
-	ICE_PTT_UNUSED_ENTRY(16),
-	ICE_PTT_UNUSED_ENTRY(17),
-	ICE_PTT_UNUSED_ENTRY(18),
-	ICE_PTT_UNUSED_ENTRY(19),
-	ICE_PTT_UNUSED_ENTRY(20),
-	ICE_PTT_UNUSED_ENTRY(21),
-
-	/* Non Tunneled IPv4 */
-	ICE_PTT(22, IP, IPV4, FRG, NONE, NONE, NOF, NONE, PAY3),
-	ICE_PTT(23, IP, IPV4, NOF, NONE, NONE, NOF, NONE, PAY3),
-	ICE_PTT(24, IP, IPV4, NOF, NONE, NONE, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(25),
-	ICE_PTT(26, IP, IPV4, NOF, NONE, NONE, NOF, TCP,  PAY4),
-	ICE_PTT(27, IP, IPV4, NOF, NONE, NONE, NOF, SCTP, PAY4),
-	ICE_PTT(28, IP, IPV4, NOF, NONE, NONE, NOF, ICMP, PAY4),
-
-	/* IPv4 --> IPv4 */
-	ICE_PTT(29, IP, IPV4, NOF, IP_IP, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(30, IP, IPV4, NOF, IP_IP, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(31, IP, IPV4, NOF, IP_IP, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(32),
-	ICE_PTT(33, IP, IPV4, NOF, IP_IP, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(34, IP, IPV4, NOF, IP_IP, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(35, IP, IPV4, NOF, IP_IP, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv4 --> IPv6 */
-	ICE_PTT(36, IP, IPV4, NOF, IP_IP, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(37, IP, IPV4, NOF, IP_IP, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(38, IP, IPV4, NOF, IP_IP, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(39),
-	ICE_PTT(40, IP, IPV4, NOF, IP_IP, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(41, IP, IPV4, NOF, IP_IP, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(42, IP, IPV4, NOF, IP_IP, IPV6, NOF, ICMP, PAY4),
-
-	/* IPv4 --> GRE/NAT */
-	ICE_PTT(43, IP, IPV4, NOF, IP_GRENAT, NONE, NOF, NONE, PAY3),
-
-	/* IPv4 --> GRE/NAT --> IPv4 */
-	ICE_PTT(44, IP, IPV4, NOF, IP_GRENAT, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(45, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(46, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(47),
-	ICE_PTT(48, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(49, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(50, IP, IPV4, NOF, IP_GRENAT, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv4 --> GRE/NAT --> IPv6 */
-	ICE_PTT(51, IP, IPV4, NOF, IP_GRENAT, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(52, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(53, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(54),
-	ICE_PTT(55, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(56, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(57, IP, IPV4, NOF, IP_GRENAT, IPV6, NOF, ICMP, PAY4),
-
-	/* IPv4 --> GRE/NAT --> MAC */
-	ICE_PTT(58, IP, IPV4, NOF, IP_GRENAT_MAC, NONE, NOF, NONE, PAY3),
-
-	/* IPv4 --> GRE/NAT --> MAC --> IPv4 */
-	ICE_PTT(59, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(60, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(61, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(62),
-	ICE_PTT(63, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(64, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(65, IP, IPV4, NOF, IP_GRENAT_MAC, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv4 --> GRE/NAT -> MAC --> IPv6 */
-	ICE_PTT(66, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(67, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(68, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(69),
-	ICE_PTT(70, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(71, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(72, IP, IPV4, NOF, IP_GRENAT_MAC, IPV6, NOF, ICMP, PAY4),
-
-	/* IPv4 --> GRE/NAT --> MAC/VLAN */
-	ICE_PTT(73, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, NONE, NOF, NONE, PAY3),
-
-	/* IPv4 ---> GRE/NAT -> MAC/VLAN --> IPv4 */
-	ICE_PTT(74, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(75, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(76, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(77),
-	ICE_PTT(78, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(79, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(80, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv4 -> GRE/NAT -> MAC/VLAN --> IPv6 */
-	ICE_PTT(81, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(82, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(83, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(84),
-	ICE_PTT(85, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(86, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(87, IP, IPV4, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, ICMP, PAY4),
-
-	/* Non Tunneled IPv6 */
-	ICE_PTT(88, IP, IPV6, FRG, NONE, NONE, NOF, NONE, PAY3),
-	ICE_PTT(89, IP, IPV6, NOF, NONE, NONE, NOF, NONE, PAY3),
-	ICE_PTT(90, IP, IPV6, NOF, NONE, NONE, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(91),
-	ICE_PTT(92, IP, IPV6, NOF, NONE, NONE, NOF, TCP,  PAY4),
-	ICE_PTT(93, IP, IPV6, NOF, NONE, NONE, NOF, SCTP, PAY4),
-	ICE_PTT(94, IP, IPV6, NOF, NONE, NONE, NOF, ICMP, PAY4),
-
-	/* IPv6 --> IPv4 */
-	ICE_PTT(95, IP, IPV6, NOF, IP_IP, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(96, IP, IPV6, NOF, IP_IP, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(97, IP, IPV6, NOF, IP_IP, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(98),
-	ICE_PTT(99, IP, IPV6, NOF, IP_IP, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(100, IP, IPV6, NOF, IP_IP, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(101, IP, IPV6, NOF, IP_IP, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv6 --> IPv6 */
-	ICE_PTT(102, IP, IPV6, NOF, IP_IP, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(103, IP, IPV6, NOF, IP_IP, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(104, IP, IPV6, NOF, IP_IP, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(105),
-	ICE_PTT(106, IP, IPV6, NOF, IP_IP, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(107, IP, IPV6, NOF, IP_IP, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(108, IP, IPV6, NOF, IP_IP, IPV6, NOF, ICMP, PAY4),
-
-	/* IPv6 --> GRE/NAT */
-	ICE_PTT(109, IP, IPV6, NOF, IP_GRENAT, NONE, NOF, NONE, PAY3),
-
-	/* IPv6 --> GRE/NAT -> IPv4 */
-	ICE_PTT(110, IP, IPV6, NOF, IP_GRENAT, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(111, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(112, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(113),
-	ICE_PTT(114, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(115, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(116, IP, IPV6, NOF, IP_GRENAT, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv6 --> GRE/NAT -> IPv6 */
-	ICE_PTT(117, IP, IPV6, NOF, IP_GRENAT, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(118, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(119, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(120),
-	ICE_PTT(121, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(122, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(123, IP, IPV6, NOF, IP_GRENAT, IPV6, NOF, ICMP, PAY4),
-
-	/* IPv6 --> GRE/NAT -> MAC */
-	ICE_PTT(124, IP, IPV6, NOF, IP_GRENAT_MAC, NONE, NOF, NONE, PAY3),
-
-	/* IPv6 --> GRE/NAT -> MAC -> IPv4 */
-	ICE_PTT(125, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(126, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(127, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(128),
-	ICE_PTT(129, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(130, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(131, IP, IPV6, NOF, IP_GRENAT_MAC, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv6 --> GRE/NAT -> MAC -> IPv6 */
-	ICE_PTT(132, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(133, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(134, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(135),
-	ICE_PTT(136, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(137, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(138, IP, IPV6, NOF, IP_GRENAT_MAC, IPV6, NOF, ICMP, PAY4),
-
-	/* IPv6 --> GRE/NAT -> MAC/VLAN */
-	ICE_PTT(139, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, NONE, NOF, NONE, PAY3),
-
-	/* IPv6 --> GRE/NAT -> MAC/VLAN --> IPv4 */
-	ICE_PTT(140, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, FRG, NONE, PAY3),
-	ICE_PTT(141, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, NONE, PAY3),
-	ICE_PTT(142, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(143),
-	ICE_PTT(144, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, TCP,  PAY4),
-	ICE_PTT(145, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, SCTP, PAY4),
-	ICE_PTT(146, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV4, NOF, ICMP, PAY4),
-
-	/* IPv6 --> GRE/NAT -> MAC/VLAN --> IPv6 */
-	ICE_PTT(147, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, FRG, NONE, PAY3),
-	ICE_PTT(148, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, NONE, PAY3),
-	ICE_PTT(149, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, UDP,  PAY4),
-	ICE_PTT_UNUSED_ENTRY(150),
-	ICE_PTT(151, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, TCP,  PAY4),
-	ICE_PTT(152, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, SCTP, PAY4),
-	ICE_PTT(153, IP, IPV6, NOF, IP_GRENAT_MAC_VLAN, IPV6, NOF, ICMP, PAY4),
+	ICE_PTYPES
 
 	/* unused entries */
-	[154 ... 1023] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+	[ICE_NUM_DEFINED_PTYPES ... 1023] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 };
 
 static inline struct ice_rx_ptype_decoded ice_decode_rx_desc_ptype(u16 ptype)
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 463d9e5cbe05..b11cfaedb81c 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -567,6 +567,79 @@ static int ice_xdp_rx_hw_ts(const struct xdp_md *ctx, u64 *ts_ns)
 	return 0;
 }
 
+/* Define a ptype index -> XDP hash type lookup table.
+ * It uses the same ptype definitions as ice_decode_rx_desc_ptype[],
+ * avoiding possible copy-paste errors.
+ */
+#undef ICE_PTT
+#undef ICE_PTT_UNUSED_ENTRY
+
+#define ICE_PTT(PTYPE, OUTER_IP, OUTER_IP_VER, OUTER_FRAG, T, TE, TEF, I, PL)\
+	[PTYPE] = XDP_RSS_L3_##OUTER_IP_VER | XDP_RSS_L4_##I | XDP_RSS_TYPE_##PL
+
+#define ICE_PTT_UNUSED_ENTRY(PTYPE) [PTYPE] = 0
+
+/* A few supplementary definitions for when XDP hash types do not coincide
+ * with what can be generated from ptype definitions
+ * by means of preprocessor concatenation.
+ */
+#define XDP_RSS_L3_NONE		XDP_RSS_TYPE_NONE
+#define XDP_RSS_L4_NONE		XDP_RSS_TYPE_NONE
+#define XDP_RSS_TYPE_PAY2	XDP_RSS_TYPE_L2
+#define XDP_RSS_TYPE_PAY3	XDP_RSS_TYPE_NONE
+#define XDP_RSS_TYPE_PAY4	XDP_RSS_L4
+
+static const enum xdp_rss_hash_type
+ice_ptype_to_xdp_hash[ICE_NUM_DEFINED_PTYPES] = {
+	ICE_PTYPES
+};
+
+#undef XDP_RSS_L3_NONE
+#undef XDP_RSS_L4_NONE
+#undef XDP_RSS_TYPE_PAY2
+#undef XDP_RSS_TYPE_PAY3
+#undef XDP_RSS_TYPE_PAY4
+
+#undef ICE_PTT
+#undef ICE_PTT_UNUSED_ENTRY
+
+/**
+ * ice_xdp_rx_hash_type - Get XDP-specific hash type from the RX descriptor
+ * @eop_desc: End of Packet descriptor
+ */
+static enum xdp_rss_hash_type
+ice_xdp_rx_hash_type(const union ice_32b_rx_flex_desc *eop_desc)
+{
+	u16 ptype = ice_get_ptype(eop_desc);
+
+	if (unlikely(ptype >= ICE_NUM_DEFINED_PTYPES))
+		return 0;
+
+	return ice_ptype_to_xdp_hash[ptype];
+}
+
+/**
+ * ice_xdp_rx_hash - RX hash XDP hint handler
+ * @ctx: XDP buff pointer
+ * @hash: hash destination address
+ * @rss_type: XDP hash type destination address
+ *
+ * Copy RX hash (if available) and its type to the destination address.
+ */
+static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
+			   enum xdp_rss_hash_type *rss_type)
+{
+	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+
+	*hash = ice_get_rx_hash(xdp_ext->pkt_ctx.eop_desc);
+	*rss_type = ice_xdp_rx_hash_type(xdp_ext->pkt_ctx.eop_desc);
+	if (!likely(*hash))
+		return -ENODATA;
+
+	return 0;
+}
+
 const struct xdp_metadata_ops ice_xdp_md_ops = {
 	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
+	.xmo_rx_hash			= ice_xdp_rx_hash,
 };
diff --git a/include/net/xdp.h b/include/net/xdp.h
index d1c5381fc95f..6381560efae2 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -417,6 +417,7 @@ enum xdp_rss_hash_type {
 	XDP_RSS_L4_UDP		= BIT(5),
 	XDP_RSS_L4_SCTP		= BIT(6),
 	XDP_RSS_L4_IPSEC	= BIT(7), /* L4 based hash include IPSEC SPI */
+	XDP_RSS_L4_ICMP		= BIT(8),
 
 	/* Second part: RSS hash type combinations used for driver HW mapping */
 	XDP_RSS_TYPE_NONE            = 0,
@@ -432,11 +433,13 @@ enum xdp_rss_hash_type {
 	XDP_RSS_TYPE_L4_IPV4_UDP     = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
 	XDP_RSS_TYPE_L4_IPV4_SCTP    = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
 	XDP_RSS_TYPE_L4_IPV4_IPSEC   = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
+	XDP_RSS_TYPE_L4_IPV4_ICMP    = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_ICMP,
 
 	XDP_RSS_TYPE_L4_IPV6_TCP     = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
 	XDP_RSS_TYPE_L4_IPV6_UDP     = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
 	XDP_RSS_TYPE_L4_IPV6_SCTP    = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
 	XDP_RSS_TYPE_L4_IPV6_IPSEC   = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
+	XDP_RSS_TYPE_L4_IPV6_ICMP    = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_ICMP,
 
 	XDP_RSS_TYPE_L4_IPV6_TCP_EX  = XDP_RSS_TYPE_L4_IPV6_TCP  | XDP_RSS_L3_DYNHDR,
 	XDP_RSS_TYPE_L4_IPV6_UDP_EX  = XDP_RSS_TYPE_L4_IPV6_UDP  | XDP_RSS_L3_DYNHDR,
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 08/21] ice: Support XDP hints in AF_XDP ZC mode

[Larysa Zaremba]

In AF_XDP ZC, xdp_buff is not stored on ring,
instead it is provided by xsk_pool.
Space for metadata sources right after such buffers was already reserved
in commit 94ecc5ca4dbf ("xsk: Add cb area to struct xdp_buff_xsk").
This makes the implementation rather straightforward.

Update AF_XDP ZC packet processing to support XDP hints.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_xsk.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 4212172a758d..cde91a413661 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -705,16 +705,25 @@ static int ice_xmit_xdp_tx_zc(struct xdp_buff *xdp,
  * @xdp: xdp_buff used as input to the XDP program
  * @xdp_prog: XDP program to run
  * @xdp_ring: ring to be used for XDP_TX action
+ * @rx_desc: packet descriptor
  *
  * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
  */
 static int
 ice_run_xdp_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
-	       struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring)
+	       struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring,
+	       union ice_32b_rx_flex_desc *rx_desc)
 {
 	int err, result = ICE_XDP_PASS;
 	u32 act;
 
+	/* We can safely convert xdp_buff_xsk to ice_xdp_buff,
+	 * because there are XSK_PRIV_MAX bytes reserved in xdp_buff_xsk
+	 * right after xdp_buff, for our private use.
+	 * Macro insures we do not go above the limit.
+	 */
+	XSK_CHECK_PRIV_TYPE(struct ice_xdp_buff);
+	ice_xdp_meta_set_desc(xdp, rx_desc);
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
 
 	if (likely(act == XDP_REDIRECT)) {
@@ -812,7 +821,8 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
 		xsk_buff_set_size(xdp, size);
 		xsk_buff_dma_sync_for_cpu(xdp, rx_ring->xsk_pool);
 
-		xdp_res = ice_run_xdp_zc(rx_ring, xdp, xdp_prog, xdp_ring);
+		xdp_res = ice_run_xdp_zc(rx_ring, xdp, xdp_prog, xdp_ring,
+					 rx_desc);
 		if (likely(xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR))) {
 			xdp_xmit |= xdp_res;
 		} else if (xdp_res == ICE_XDP_EXIT) {
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 09/21] xdp: Add VLAN tag hint

[Larysa Zaremba]

Implement functionality that enables drivers to expose VLAN tag
to XDP code.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 Documentation/networking/xdp-rx-metadata.rst |  8 ++++-
 include/linux/netdevice.h                    |  2 ++
 include/net/xdp.h                            |  2 ++
 kernel/bpf/offload.c                         |  2 ++
 net/core/xdp.c                               | 34 ++++++++++++++++++++
 5 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
index 25ce72af81c2..ea6dd79a21d3 100644
--- a/Documentation/networking/xdp-rx-metadata.rst
+++ b/Documentation/networking/xdp-rx-metadata.rst
@@ -18,7 +18,13 @@ Currently, the following kfuncs are supported. In the future, as more
 metadata is supported, this set will grow:
 
 .. kernel-doc:: net/core/xdp.c
-   :identifiers: bpf_xdp_metadata_rx_timestamp bpf_xdp_metadata_rx_hash
+   :identifiers: bpf_xdp_metadata_rx_timestamp
+
+.. kernel-doc:: net/core/xdp.c
+   :identifiers: bpf_xdp_metadata_rx_hash
+
+.. kernel-doc:: net/core/xdp.c
+   :identifiers: bpf_xdp_metadata_rx_vlan_tag
 
 An XDP program can use these kfuncs to read the metadata into stack
 variables for its own consumption. Or, to pass the metadata on to other
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index b828c7a75be2..1749f4f75c64 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1658,6 +1658,8 @@ struct xdp_metadata_ops {
 	int	(*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
 	int	(*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash,
 			       enum xdp_rss_hash_type *rss_type);
+	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
+				   __be16 *vlan_proto);
 };
 
 /**
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 6381560efae2..89c58f56ffc6 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -389,6 +389,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
 			   bpf_xdp_metadata_rx_timestamp) \
 	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
 			   bpf_xdp_metadata_rx_hash) \
+	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
+			   bpf_xdp_metadata_rx_vlan_tag) \
 
 enum {
 #define XDP_METADATA_KFUNC(name, _) name,
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 8a26cd8814c1..986e7becfd42 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -848,6 +848,8 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
 		p = ops->xmo_rx_timestamp;
 	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
 		p = ops->xmo_rx_hash;
+	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_VLAN_TAG))
+		p = ops->xmo_rx_vlan_tag;
 out:
 	up_read(&bpf_devs_lock);
 
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 8362130bf085..8b55419d332e 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -738,6 +738,40 @@ __bpf_kfunc int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, u32 *hash,
 	return -EOPNOTSUPP;
 }
 
+/**
+ * bpf_xdp_metadata_rx_vlan_tag - Get XDP packet outermost VLAN tag
+ * @ctx: XDP context pointer.
+ * @vlan_tci: Destination pointer for VLAN TCI (VID + DEI + PCP)
+ * @vlan_proto: Destination pointer for VLAN Tag protocol identifier (TPID).
+ *
+ * In case of success, ``vlan_proto`` contains *Tag protocol identifier (TPID)*,
+ * usually ``ETH_P_8021Q`` or ``ETH_P_8021AD``, but some networks can use
+ * custom TPIDs. ``vlan_proto`` is stored in **network byte order (BE)**
+ * and should be used as follows:
+ * ``if (vlan_proto == bpf_htons(ETH_P_8021Q)) do_something();``
+ *
+ * ``vlan_tci`` contains the remaining 16 bits of a VLAN tag.
+ * Driver is expected to provide those in **host byte order (usually LE)**,
+ * so the bpf program should not perform byte conversion.
+ * According to 802.1Q standard, *VLAN TCI (Tag control information)*
+ * is a bit field that contains:
+ * *VLAN identifier (VID)* that can be read with ``vlan_tci & 0xfff``,
+ * *Drop eligible indicator (DEI)* - 1 bit,
+ * *Priority code point (PCP)* - 3 bits.
+ * For detailed meaning of DEI and PCP, please refer to other sources.
+ *
+ * Return:
+ * * Returns 0 on success or ``-errno`` on error.
+ * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
+ * * ``-ENODATA``    : VLAN tag was not stripped or is not available
+ */
+__bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
+					     u16 *vlan_tci,
+					     __be16 *vlan_proto)
+{
+	return -EOPNOTSUPP;
+}
+
 __diag_pop();
 
 BTF_SET8_START(xdp_metadata_kfunc_ids)
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 10/21] ice: Implement VLAN tag hint

[Larysa Zaremba]

Implement .xmo_rx_vlan_tag callback to allow XDP code to read
packet's VLAN tag.

At the same time, use vlan_tci instead of vlan_tag in touched code,
because vlan_tag is misleading.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c     | 22 ++++++++++++++++
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  6 ++---
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  1 +
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 26 +++++++++++++++++++
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h |  4 +--
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  6 ++---
 6 files changed, 57 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index dac523d5e579..cdfe257a5aa8 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -5937,6 +5937,23 @@ ice_fix_features(struct net_device *netdev, netdev_features_t features)
 	return features;
 }
 
+/**
+ * ice_set_rx_rings_vlan_proto - update rings with new stripped VLAN proto
+ * @vsi: PF's VSI
+ * @vlan_ethertype: VLAN ethertype (802.1Q or 802.1ad) in network byte order
+ *
+ * Store current stripped VLAN proto in ring packet context,
+ * so it can be accessed more efficiently by packet processing code.
+ */
+static void
+ice_set_rx_rings_vlan_proto(struct ice_vsi *vsi, __be16 vlan_ethertype)
+{
+	u16 i;
+
+	ice_for_each_alloc_rxq(vsi, i)
+		vsi->rx_rings[i]->pkt_ctx.vlan_proto = vlan_ethertype;
+}
+
 /**
  * ice_set_vlan_offload_features - set VLAN offload features for the PF VSI
  * @vsi: PF's VSI
@@ -5979,6 +5996,11 @@ ice_set_vlan_offload_features(struct ice_vsi *vsi, netdev_features_t features)
 	if (strip_err || insert_err)
 		return -EIO;
 
+	if (enable_stripping)
+		ice_set_rx_rings_vlan_proto(vsi, htons(vlan_ethertype));
+	else
+		ice_set_rx_rings_vlan_proto(vsi, 0);
+
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 4e6546d9cf85..4fd7614f243d 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1183,7 +1183,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 		struct sk_buff *skb;
 		unsigned int size;
 		u16 stat_err_bits;
-		u16 vlan_tag = 0;
+		u16 vlan_tci;
 
 		/* get the Rx desc from Rx ring based on 'next_to_clean' */
 		rx_desc = ICE_RX_DESC(rx_ring, ntc);
@@ -1278,7 +1278,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 			continue;
 		}
 
-		vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
+		vlan_tci = ice_get_vlan_tci(rx_desc);
 
 		/* pad the skb if needed, to make a valid ethernet frame */
 		if (eth_skb_pad(skb))
@@ -1292,7 +1292,7 @@ int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 
 		ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb);
 		/* send completed skb up the stack */
-		ice_receive_skb(rx_ring, skb, vlan_tag);
+		ice_receive_skb(rx_ring, skb, vlan_tci);
 
 		/* update budget accounting */
 		total_rx_pkts++;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 4237702a58a9..41e0b14e6643 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -260,6 +260,7 @@ enum ice_rx_dtype {
 struct ice_pkt_ctx {
 	const union ice_32b_rx_flex_desc *eop_desc;
 	u64 cached_phctime;
+	__be16 vlan_proto;
 };
 
 struct ice_xdp_buff {
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index b11cfaedb81c..4ad6db83674e 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -639,7 +639,33 @@ static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
 	return 0;
 }
 
+/**
+ * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler
+ * @ctx: XDP buff pointer
+ * @vlan_tci: destination address for VLAN tag
+ * @vlan_proto: destination address for VLAN protocol
+ *
+ * Copy VLAN tag (if was stripped) and corresponding protocol
+ * to the destination address.
+ */
+static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
+			       __be16 *vlan_proto)
+{
+	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+
+	*vlan_proto = xdp_ext->pkt_ctx.vlan_proto;
+	if (!*vlan_proto)
+		return -ENODATA;
+
+	*vlan_tci = ice_get_vlan_tci(xdp_ext->pkt_ctx.eop_desc);
+	if (!*vlan_tag)
+		return -ENODATA;
+
+	return 0;
+}
+
 const struct xdp_metadata_ops ice_xdp_md_ops = {
 	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
 	.xmo_rx_hash			= ice_xdp_rx_hash,
+	.xmo_rx_vlan_tag		= ice_xdp_rx_vlan_tag,
 };
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
index 145883eec129..b7205826fea8 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
@@ -84,7 +84,7 @@ ice_build_ctob(u64 td_cmd, u64 td_offset, unsigned int size, u64 td_tag)
 }
 
 /**
- * ice_get_vlan_tag_from_rx_desc - get VLAN from Rx flex descriptor
+ * ice_get_vlan_tci - get VLAN TCI from Rx flex descriptor
  * @rx_desc: Rx 32b flex descriptor with RXDID=2
  *
  * The OS and current PF implementation only support stripping a single VLAN tag
@@ -92,7 +92,7 @@ ice_build_ctob(u64 td_cmd, u64 td_offset, unsigned int size, u64 td_tag)
  * one is found return the tag, else return 0 to mean no VLAN tag was found.
  */
 static inline u16
-ice_get_vlan_tag_from_rx_desc(union ice_32b_rx_flex_desc *rx_desc)
+ice_get_vlan_tci(const union ice_32b_rx_flex_desc *rx_desc)
 {
 	u16 stat_err_bits;
 
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index cde91a413661..8765f8347058 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -789,7 +789,7 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
 		struct xdp_buff *xdp;
 		struct sk_buff *skb;
 		u16 stat_err_bits;
-		u16 vlan_tag = 0;
+		u16 vlan_tci;
 
 		rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean);
 
@@ -858,10 +858,10 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
 		total_rx_bytes += skb->len;
 		total_rx_packets++;
 
-		vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
+		vlan_tci = ice_get_vlan_tci(rx_desc);
 
 		ice_process_skb_fields(rx_ring, rx_desc, skb);
-		ice_receive_skb(rx_ring, skb, vlan_tag);
+		ice_receive_skb(rx_ring, skb, vlan_tci);
 	}
 
 	entries_to_alloc = ICE_DESC_UNUSED(rx_ring);
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 11/21] ice: use VLAN proto from ring packet context in skb path

[Larysa Zaremba]

VLAN proto, used in ice XDP hints implementation is stored in ring packet
context. Utilize this value in skb VLAN processing too instead of checking
netdev features.

At the same time, use vlan_tci instead of vlan_tag in touched code,
because vlan_tag is misleading.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 14 +++++---------
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h |  2 +-
 2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 4ad6db83674e..54685d0747aa 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -283,21 +283,17 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
  * ice_receive_skb - Send a completed packet up the stack
  * @rx_ring: Rx ring in play
  * @skb: packet to send up
- * @vlan_tag: VLAN tag for packet
+ * @vlan_tci: VLAN TCI for packet
  *
  * This function sends the completed packet (via. skb) up the stack using
  * gro receive functions (with/without VLAN tag)
  */
 void
-ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag)
+ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci)
 {
-	netdev_features_t features = rx_ring->netdev->features;
-	bool non_zero_vlan = !!(vlan_tag & VLAN_VID_MASK);
-
-	if ((features & NETIF_F_HW_VLAN_CTAG_RX) && non_zero_vlan)
-		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
-	else if ((features & NETIF_F_HW_VLAN_STAG_RX) && non_zero_vlan)
-		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), vlan_tag);
+	if (vlan_tci & VLAN_VID_MASK && rx_ring->pkt_ctx.vlan_proto)
+		__vlan_hwaccel_put_tag(skb, rx_ring->pkt_ctx.vlan_proto,
+				       vlan_tci);
 
 	napi_gro_receive(&rx_ring->q_vector->napi, skb);
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
index b7205826fea8..8487884bf5c4 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
@@ -150,7 +150,7 @@ ice_process_skb_fields(struct ice_rx_ring *rx_ring,
 		       union ice_32b_rx_flex_desc *rx_desc,
 		       struct sk_buff *skb);
 void
-ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tag);
+ice_receive_skb(struct ice_rx_ring *rx_ring, struct sk_buff *skb, u16 vlan_tci);
 
 static inline void
 ice_xdp_meta_set_desc(struct xdp_buff *xdp,
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Larysa Zaremba]

Implement functionality that enables drivers to expose to XDP code checksum
information that consists of:

- Checksum status - bitfield that consists of
  - number of consecutive validated checksums. This is almost the same as
    csum_level in skb, but starts with 1. Enum names for those bits still
    use checksum level concept, so it is less confusing for driver
    developers.
  - Is checksum partial? This bit cannot coexist with any other
  - Is there a complete checksum available?
- Additional checksum data, a union of:
  - checksum start and offset, if checksum is partial
  - complete checksum, if available

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 Documentation/networking/xdp-rx-metadata.rst |  3 ++
 include/linux/netdevice.h                    |  3 ++
 include/net/xdp.h                            | 46 ++++++++++++++++++++
 kernel/bpf/offload.c                         |  2 +
 net/core/xdp.c                               | 23 ++++++++++
 5 files changed, 77 insertions(+)

diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
index ea6dd79a21d3..7f056a44f682 100644
--- a/Documentation/networking/xdp-rx-metadata.rst
+++ b/Documentation/networking/xdp-rx-metadata.rst
@@ -26,6 +26,9 @@ metadata is supported, this set will grow:
 .. kernel-doc:: net/core/xdp.c
    :identifiers: bpf_xdp_metadata_rx_vlan_tag
 
+.. kernel-doc:: net/core/xdp.c
+   :identifiers: bpf_xdp_metadata_rx_csum
+
 An XDP program can use these kfuncs to read the metadata into stack
 variables for its own consumption. Or, to pass the metadata on to other
 consumers, an XDP program can store it into the metadata area carried
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1749f4f75c64..4f6da36ac123 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
 			       enum xdp_rss_hash_type *rss_type);
 	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
 				   __be16 *vlan_proto);
+	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
+			       enum xdp_csum_status *csum_status,
+			       union xdp_csum_info *csum_info);
 };
 
 /**
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 89c58f56ffc6..2b7a7d678ff4 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
 			   bpf_xdp_metadata_rx_hash) \
 	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
 			   bpf_xdp_metadata_rx_vlan_tag) \
+	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
+			   bpf_xdp_metadata_rx_csum) \
 
 enum {
 #define XDP_METADATA_KFUNC(name, _) name,
@@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
 	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
 };
 
+union xdp_csum_info {
+	/* Checksum referred to by ``csum_start + csum_offset`` is considered
+	 * valid, but was never calculated, TX device has to do this,
+	 * starting from csum_start packet byte.
+	 * Any preceding checksums are also considered valid.
+	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
+	 */
+	struct {
+		u16 csum_start;
+		u16 csum_offset;
+	};
+
+	/* Checksum, calculated over the whole packet.
+	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
+	 */
+	u32 checksum;
+};
+
+enum xdp_csum_status {
+	/* HW had parsed several transport headers and validated their
+	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
+	 * 3 least significat bytes contain number of consecutive checksum,
+	 * starting with the outermost, reported by hardware as valid.
+	 * ``sk_buff`` checksum level (``csum_level``) notation is provided
+	 * for driver developers.
+	 */
+	XDP_CHECKSUM_VALID_LVL0		= 1,	/* 1 outermost checksum */
+	XDP_CHECKSUM_VALID_LVL1		= 2,	/* 2 outermost checksums */
+	XDP_CHECKSUM_VALID_LVL2		= 3,	/* 3 outermost checksums */
+	XDP_CHECKSUM_VALID_LVL3		= 4,	/* 4 outermost checksums */
+	XDP_CHECKSUM_VALID_NUM_MASK	= GENMASK(2, 0),
+	XDP_CHECKSUM_VALID		= XDP_CHECKSUM_VALID_NUM_MASK,
+
+	/* Occurs if packet is sent virtually (between Linux VMs / containers)
+	 * This status cannot coexist with any other.
+	 * Refer to ``csum_start`` and ``csum_offset`` in ``xdp_csum_info``
+	 * for more information.
+	 */
+	XDP_CHECKSUM_PARTIAL	= BIT(3),
+
+	/* Checksum, calculated over the entire packet is provided */
+	XDP_CHECKSUM_COMPLETE	= BIT(4),
+};
+
 #ifdef CONFIG_NET
 u32 bpf_xdp_metadata_kfunc_id(int id);
 bool bpf_dev_bound_kfunc_id(u32 btf_id);
diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
index 986e7becfd42..f60a6add5273 100644
--- a/kernel/bpf/offload.c
+++ b/kernel/bpf/offload.c
@@ -850,6 +850,8 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
 		p = ops->xmo_rx_hash;
 	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_VLAN_TAG))
 		p = ops->xmo_rx_vlan_tag;
+	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_CSUM))
+		p = ops->xmo_rx_csum;
 out:
 	up_read(&bpf_devs_lock);
 
diff --git a/net/core/xdp.c b/net/core/xdp.c
index 8b55419d332e..d4ea54046afc 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -772,6 +772,29 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
 	return -EOPNOTSUPP;
 }
 
+/**
+ * bpf_xdp_metadata_rx_csum - Get checksum status with additional info.
+ * @ctx: XDP context pointer.
+ * @csum_status: Destination for checksum status.
+ * @csum_info: Destination for complete checksum or partial checksum offset.
+ *
+ * Status (@csum_status) is a bitfield that informs, what checksum
+ * processing was performed. Additional results of such processing,
+ * such as complete checksum or partial checksum offsets,
+ * are passed as info (@csum_info).
+ *
+ * Return:
+ * * Returns 0 on success or ``-errno`` on error.
+ * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
+ * * ``-ENODATA``    : Checksum status is unknown
+ */
+__bpf_kfunc int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
+					 enum xdp_csum_status *csum_status,
+					 union xdp_csum_info *csum_info)
+{
+	return -EOPNOTSUPP;
+}
+
 __diag_pop();
 
 BTF_SET8_START(xdp_metadata_kfunc_ids)
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Larysa Zaremba]

Implement .xmo_rx_csum callback to allow XDP code to determine,
whether HW has validated any checksums.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 54685d0747aa..6647a7e55ac8 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
 	return 0;
 }
 
+/**
+ * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
+ * @ctx: XDP buff pointer
+ * @csum_status: destination address
+ * @csum_info: destination address
+ *
+ * Copy HW checksum level (if was checked) to the destination address.
+ */
+static int ice_xdp_rx_csum(const struct xdp_md *ctx,
+			   enum xdp_csum_status *csum_status,
+			   union xdp_csum_info *csum_info)
+{
+	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
+	const union ice_32b_rx_flex_desc *eop_desc;
+	enum ice_rx_csum_status status;
+	u16 ptype;
+
+	eop_desc = xdp_ext->pkt_ctx.eop_desc;
+	ptype = ice_get_ptype(eop_desc);
+
+	status = ice_get_rx_csum_status(eop_desc, ptype);
+	if (status & ICE_RX_CSUM_NONE)
+		return -ENODATA;
+
+	*csum_status = ice_rx_csum_lvl(status) + 1;
+	return 0;
+}
+
 const struct xdp_metadata_ops ice_xdp_md_ops = {
 	.xmo_rx_timestamp		= ice_xdp_rx_hw_ts,
 	.xmo_rx_hash			= ice_xdp_rx_hash,
 	.xmo_rx_vlan_tag		= ice_xdp_rx_vlan_tag,
+	.xmo_rx_csum			= ice_xdp_rx_csum,
 };
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 14/21] selftests/bpf: Allow VLAN packets in xdp_hw_metadata

[Larysa Zaremba]

Make VLAN c-tag and s-tag XDP hint testing more convenient
by not skipping VLAN-ed packets.

Allow both 802.1ad and 802.1Q headers.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 tools/testing/selftests/bpf/progs/xdp_hw_metadata.c | 10 +++++++++-
 tools/testing/selftests/bpf/xdp_metadata.h          |  8 ++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index b2dfd7066c6e..63d7de6c6bbb 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
@@ -26,15 +26,23 @@ int rx(struct xdp_md *ctx)
 {
 	void *data, *data_meta, *data_end;
 	struct ipv6hdr *ip6h = NULL;
-	struct ethhdr *eth = NULL;
 	struct udphdr *udp = NULL;
 	struct iphdr *iph = NULL;
 	struct xdp_meta *meta;
+	struct ethhdr *eth;
 	int err;
 
 	data = (void *)(long)ctx->data;
 	data_end = (void *)(long)ctx->data_end;
 	eth = data;
+
+	if (eth + 1 < data_end && (eth->h_proto == bpf_htons(ETH_P_8021AD) ||
+				   eth->h_proto == bpf_htons(ETH_P_8021Q)))
+		eth = (void *)eth + sizeof(struct vlan_hdr);
+
+	if (eth + 1 < data_end && eth->h_proto == bpf_htons(ETH_P_8021Q))
+		eth = (void *)eth + sizeof(struct vlan_hdr);
+
 	if (eth + 1 < data_end) {
 		if (eth->h_proto == bpf_htons(ETH_P_IP)) {
 			iph = (void *)(eth + 1);
diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
index 938a729bd307..6664893c2c77 100644
--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h
@@ -9,6 +9,14 @@
 #define ETH_P_IPV6 0x86DD
 #endif
 
+#ifndef ETH_P_8021Q
+#define ETH_P_8021Q 0x8100
+#endif
+
+#ifndef ETH_P_8021AD
+#define ETH_P_8021AD 0x88A8
+#endif
+
 struct xdp_meta {
 	__u64 rx_timestamp;
 	__u64 xdp_timestamp;
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 15/21] net, xdp: allow metadata > 32

[Larysa Zaremba]

From: Aleksander Lobakin <aleksander.lobakin@intel.com>

When using XDP hints, metadata sometimes has to be much bigger
than 32 bytes. Relax the restriction, allow metadata larger than 32 bytes
and make __skb_metadata_differs() work with bigger lengths.

Now size of metadata is only limited by the fact it is stored as u8
in skb_shared_info, so maximum possible value is 255. Other important
conditions, such as having enough space for xdp_frame building, are already
checked in bpf_xdp_adjust_meta().

The requirement of having its length aligned to 4 bytes is still
valid.

Signed-off-by: Aleksander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 include/linux/skbuff.h | 13 ++++++++-----
 include/net/xdp.h      |  7 ++++++-
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 91ed66952580..cd49cdd71019 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -4209,10 +4209,13 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a,
 {
 	const void *a = skb_metadata_end(skb_a);
 	const void *b = skb_metadata_end(skb_b);
-	/* Using more efficient varaiant than plain call to memcmp(). */
-#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
 	u64 diffs = 0;
 
+	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) ||
+	    BITS_PER_LONG != 64)
+		goto slow;
+
+	/* Using more efficient variant than plain call to memcmp(). */
 	switch (meta_len) {
 #define __it(x, op) (x -= sizeof(u##op))
 #define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op))
@@ -4232,11 +4235,11 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a,
 		fallthrough;
 	case  4: diffs |= __it_diff(a, b, 32);
 		break;
+	default:
+slow:
+		return memcmp(a - meta_len, b - meta_len, meta_len);
 	}
 	return diffs;
-#else
-	return memcmp(a - meta_len, b - meta_len, meta_len);
-#endif
 }
 
 static inline bool skb_metadata_differs(const struct sk_buff *skb_a,
diff --git a/include/net/xdp.h b/include/net/xdp.h
index 2b7a7d678ff4..b65f67da1a22 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -370,7 +370,12 @@ xdp_data_meta_unsupported(const struct xdp_buff *xdp)
 
 static inline bool xdp_metalen_invalid(unsigned long metalen)
 {
-	return (metalen & (sizeof(__u32) - 1)) || (metalen > 32);
+	typeof(metalen) meta_max;
+
+	meta_max = type_max(typeof_member(struct skb_shared_info, meta_len));
+	BUILD_BUG_ON(!__builtin_constant_p(meta_max));
+
+	return !IS_ALIGNED(metalen, sizeof(u32)) || metalen > meta_max;
 }
 
 struct xdp_attachment_info {
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 16/21] selftests/bpf: Add flags and new hints to xdp_hw_metadata

[Larysa Zaremba]

Add hints added in the previous patches (VLAN tag and checksum)
to the xdp_hw_metadata program.

Also, to make metadata layout more straightforward, add flags field
to pass information about validity of every separate hint separately.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../selftests/bpf/progs/xdp_hw_metadata.c     | 37 +++++++--
 tools/testing/selftests/bpf/xdp_hw_metadata.c | 79 +++++++++++++++++--
 tools/testing/selftests/bpf/xdp_metadata.h    | 31 +++++++-
 3 files changed, 135 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index 63d7de6c6bbb..75a61317668d 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
@@ -20,6 +20,12 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
 					 __u64 *timestamp) __ksym;
 extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
 				    enum xdp_rss_hash_type *rss_type) __ksym;
+extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
+					__u16 *vlan_tci,
+					__be16 *vlan_proto) __ksym;
+extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
+				    enum xdp_csum_status *csum_status,
+				    union xdp_csum_info *csum_info) __ksym;
 
 SEC("xdp")
 int rx(struct xdp_md *ctx)
@@ -84,15 +90,36 @@ int rx(struct xdp_md *ctx)
 		return XDP_PASS;
 	}
 
+	meta->hint_valid = 0;
+
 	err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
-	if (!err)
+	if (err) {
+		meta->rx_timestamp_err = err;
+	} else {
+		meta->hint_valid |= XDP_META_FIELD_TS;
 		meta->xdp_timestamp = bpf_ktime_get_tai_ns();
+	}
+
+	err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash,
+				       &meta->rx_hash_type);
+	if (err)
+		meta->rx_hash_err = err;
 	else
-		meta->rx_timestamp = 0; /* Used by AF_XDP as not avail signal */
+		meta->hint_valid |= XDP_META_FIELD_RSS;
 
-	err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
-	if (err < 0)
-		meta->rx_hash_err = err; /* Used by AF_XDP as no hash signal */
+	err = bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci,
+					   &meta->rx_vlan_proto);
+	if (err)
+		meta->rx_vlan_tag_err = err;
+	else
+		meta->hint_valid |= XDP_META_FIELD_VLAN_TAG;
+
+	err = bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
+				       (void *)&meta->rx_csum_info);
+	if (err)
+		meta->rx_csum_err = err;
+	else
+		meta->hint_valid |= XDP_META_FIELD_CSUM;
 
 	__sync_add_and_fetch(&pkts_redir, 1);
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
index 613321eb84c1..a045de7dc910 100644
--- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
@@ -19,6 +19,9 @@
 #include "xsk.h"
 
 #include <error.h>
+#include <linux/kernel.h>
+#include <linux/bits.h>
+#include <linux/bitfield.h>
 #include <linux/errqueue.h>
 #include <linux/if_link.h>
 #include <linux/net_tstamp.h>
@@ -150,21 +153,70 @@ static __u64 gettime(clockid_t clock_id)
 	return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
 }
 
+#define VLAN_PRIO_MASK		GENMASK(15, 13) /* Priority Code Point */
+#define VLAN_DEI_MASK		GENMASK(12, 12) /* Drop Eligible Indicator */
+#define VLAN_VID_MASK		GENMASK(11, 0)	/* VLAN Identifier */
+static void print_vlan_tci(__u16 tag)
+{
+	__u16 vlan_id = FIELD_GET(VLAN_VID_MASK, tag);
+	__u8 pcp = FIELD_GET(VLAN_PRIO_MASK, tag);
+	bool dei = FIELD_GET(VLAN_DEI_MASK, tag);
+
+	printf("PCP=%u, DEI=%d, VID=0x%X\n", pcp, dei, vlan_id);
+}
+
+#define XDP_CHECKSUM_VALID_NUM_MASK	GENMASK(2, 0)
+#define XDP_CHECKSUM_PARTIAL		BIT(3)
+#define XDP_CHECKSUM_COMPLETE		BIT(4)
+
+struct partial_csum_info {
+	__u16 csum_start;
+	__u16 csum_offset;
+};
+
+static void print_csum_state(__u32 status, __u32 info)
+{
+	u8 csum_num = status & XDP_CHECKSUM_VALID_NUM_MASK;
+
+	printf("Checksum status: ");
+	if (status != XDP_CHECKSUM_PARTIAL &&
+	    status & ~(XDP_CHECKSUM_COMPLETE | XDP_CHECKSUM_VALID_NUM_MASK))
+		printf("cannot be interpreted, status=0x%X\n", status);
+
+	if (status == XDP_CHECKSUM_PARTIAL) {
+		struct partial_csum_info *partial_info = (void *)&info;
+
+		printf("partial, csum_start=%u, csum_offset=%u\n",
+		       partial_info->csum_start, partial_info->csum_offset);
+		return;
+	}
+
+	if (status & XDP_CHECKSUM_COMPLETE)
+		printf("complete, checksum=0x%X%s", info,
+		       csum_num ? ", " : "\n");
+
+	if (csum_num > 1)
+		printf("%u consecutive checksums are verified\n", csum_num);
+	else if (csum_num)
+		printf("outermost checksum is verified\n");
+}
+
 static void verify_xdp_metadata(void *data, clockid_t clock_id)
 {
 	struct xdp_meta *meta;
 
 	meta = data - sizeof(*meta);
 
-	if (meta->rx_hash_err < 0)
-		printf("No rx_hash err=%d\n", meta->rx_hash_err);
-	else
+	if (meta->hint_valid & XDP_META_FIELD_RSS)
 		printf("rx_hash: 0x%X with RSS type:0x%X\n",
 		       meta->rx_hash, meta->rx_hash_type);
+	else
+		printf("No rx_hash, err=%d\n", meta->rx_hash_err);
+
+	if (meta->hint_valid & XDP_META_FIELD_TS) {
+		printf("rx_timestamp:  %llu (sec:%0.4f)\n", meta->rx_timestamp,
+		       (double)meta->rx_timestamp / NANOSEC_PER_SEC);
 
-	printf("rx_timestamp:  %llu (sec:%0.4f)\n", meta->rx_timestamp,
-	       (double)meta->rx_timestamp / NANOSEC_PER_SEC);
-	if (meta->rx_timestamp) {
 		__u64 usr_clock = gettime(clock_id);
 		__u64 xdp_clock = meta->xdp_timestamp;
 		__s64 delta_X = xdp_clock - meta->rx_timestamp;
@@ -179,8 +231,23 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id)
 		       usr_clock, (double)usr_clock / NANOSEC_PER_SEC,
 		       (double)delta_X2U / NANOSEC_PER_SEC,
 		       (double)delta_X2U / 1000);
+	} else {
+		printf("No rx_timestamp, err=%d\n", meta->rx_timestamp_err);
 	}
 
+	if (meta->hint_valid & XDP_META_FIELD_VLAN_TAG) {
+		printf("rx_vlan_proto: 0x%X\n", ntohs(meta->rx_vlan_proto));
+		printf("rx_vlan_tci: ");
+		print_vlan_tci(meta->rx_vlan_tci);
+	} else {
+		printf("No rx_vlan_tci or rx_vlan_proto, err=%d\n",
+		       meta->rx_vlan_tag_err);
+	}
+
+	if (meta->hint_valid & XDP_META_FIELD_CSUM)
+		print_csum_state(meta->rx_csum_status, meta->rx_csum_info);
+	else
+		printf("Checksum was not checked, err=%d\n", meta->rx_csum_err);
 }
 
 static void verify_skb_metadata(int fd)
diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
index 6664893c2c77..95e7b53d6bfb 100644
--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h
@@ -17,12 +17,41 @@
 #define ETH_P_8021AD 0x88A8
 #endif
 
+#ifndef BIT
+#define BIT(nr)			(1 << (nr))
+#endif
+
+enum xdp_meta_field {
+	XDP_META_FIELD_TS	= BIT(0),
+	XDP_META_FIELD_RSS	= BIT(1),
+	XDP_META_FIELD_VLAN_TAG	= BIT(2),
+	XDP_META_FIELD_CSUM	= BIT(3),
+};
+
 struct xdp_meta {
-	__u64 rx_timestamp;
+	union {
+		__u64 rx_timestamp;
+		__s32 rx_timestamp_err;
+	};
 	__u64 xdp_timestamp;
 	__u32 rx_hash;
 	union {
 		__u32 rx_hash_type;
 		__s32 rx_hash_err;
 	};
+	union {
+		struct {
+			__u16 rx_vlan_tci;
+			__be16 rx_vlan_proto;
+		};
+		__s32 rx_vlan_tag_err;
+	};
+	union {
+		struct {
+			__u32 rx_csum_status;
+			__u32 rx_csum_info;
+		};
+		__s32 rx_csum_err;
+	};
+	enum xdp_meta_field hint_valid;
 };
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 17/21] veth: Implement VLAN tag and checksum XDP hint

[Larysa Zaremba]

In order to test VLAN tag and checksum XDP hints in hardware-independent
selfttests, implement newly added XDP hints in veth driver.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/veth.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 614f3e3efab0..86239549120d 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1732,6 +1732,50 @@ static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
 	return 0;
 }
 
+static int veth_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
+				__be16 *vlan_proto)
+{
+	struct veth_xdp_buff *_ctx = (void *)ctx;
+	struct sk_buff *skb = _ctx->skb;
+	int err;
+
+	if (!skb)
+		return -ENODATA;
+
+	err = __vlan_hwaccel_get_tag(skb, vlan_tci);
+	if (err)
+		return err;
+
+	*vlan_proto = skb->vlan_proto;
+	return err;
+}
+
+static int veth_xdp_rx_csum(const struct xdp_md *ctx,
+			    enum xdp_csum_status *csum_status,
+			    union xdp_csum_info *csum_info)
+{
+	struct veth_xdp_buff *_ctx = (void *)ctx;
+	struct sk_buff *skb = _ctx->skb;
+
+	if (!skb)
+		return -ENODATA;
+
+	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+		*csum_status = skb->csum_level + 1;
+	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		*csum_status = XDP_CHECKSUM_PARTIAL;
+		csum_info->csum_start = skb_checksum_start_offset(skb);
+		csum_info->csum_offset = skb->csum_offset;
+	} else if (skb->ip_summed == CHECKSUM_COMPLETE) {
+		*csum_status = XDP_CHECKSUM_COMPLETE;
+		csum_info->checksum = skb->csum;
+	} else {
+		return -ENODATA;
+	}
+
+	return 0;
+}
+
 static const struct net_device_ops veth_netdev_ops = {
 	.ndo_init            = veth_dev_init,
 	.ndo_open            = veth_open,
@@ -1756,6 +1800,8 @@ static const struct net_device_ops veth_netdev_ops = {
 static const struct xdp_metadata_ops veth_xdp_metadata_ops = {
 	.xmo_rx_timestamp		= veth_xdp_rx_timestamp,
 	.xmo_rx_hash			= veth_xdp_rx_hash,
+	.xmo_rx_vlan_tag		= veth_xdp_rx_vlan_tag,
+	.xmo_rx_csum			= veth_xdp_rx_csum,
 };
 
 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 18/21] net: make vlan_get_tag() return -ENODATA instead of -EINVAL

[Larysa Zaremba]

__vlan_hwaccel_get_tag() is used in veth XDP hints implementation,
its return value (-EINVAL if skb is not VLAN tagged) is passed to bpf code,
but XDP hints specification requires drivers to return -ENODATA, if a hint
cannot be provided for a particular packet.

Solve this inconsistency by changing error return value of
__vlan_hwaccel_get_tag() from -EINVAL to -ENODATA, do the same thing to
__vlan_get_tag(), because this function is supposed to follow the same
convention. This, in turn, makes -ENODATA the only non-zero value
vlan_get_tag() can return. We can do this with no side effects, because
none of the users of the 3 above-mentioned functions rely on the exact
value.

Suggested-by: Jesper Dangaard Brouer <jbrouer@redhat.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 include/linux/if_vlan.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 6ba71957851e..fb35d7dd77a2 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -540,7 +540,7 @@ static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
 	struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
 
 	if (!eth_type_vlan(veth->h_vlan_proto))
-		return -EINVAL;
+		return -ENODATA;
 
 	*vlan_tci = ntohs(veth->h_vlan_TCI);
 	return 0;
@@ -561,7 +561,7 @@ static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
 		return 0;
 	} else {
 		*vlan_tci = 0;
-		return -EINVAL;
+		return -ENODATA;
 	}
 }
 
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 19/21] selftests/bpf: Use AF_INET for TX in xdp_metadata

[Larysa Zaremba]

The easiest way to simulate stripped VLAN tag in veth is to send a packet
from VLAN interface, attached to veth. Unfortunately, this approach is
incompatible with AF_XDP on TX side, because VLAN interfaces do not have
such feature.

Replace AF_XDP packet generation with sending the same datagram via
AF_INET socket.

This does not change the packet contents or hints values with one notable
exception: rx_hash_type, which previously was expected to be 0, now is
expected be at least XDP_RSS_TYPE_L4.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 167 +++++++-----------
 1 file changed, 59 insertions(+), 108 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 626c461fa34d..1877e5c6d6c7 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -20,7 +20,7 @@
 
 #define UDP_PAYLOAD_BYTES 4
 
-#define AF_XDP_SOURCE_PORT 1234
+#define UDP_SOURCE_PORT 1234
 #define AF_XDP_CONSUMER_PORT 8080
 
 #define UMEM_NUM 16
@@ -33,6 +33,12 @@
 #define RX_ADDR "10.0.0.2"
 #define PREFIX_LEN "8"
 #define FAMILY AF_INET
+#define TX_NETNS_NAME "xdp_metadata_tx"
+#define RX_NETNS_NAME "xdp_metadata_rx"
+#define TX_MAC "00:00:00:00:00:01"
+#define RX_MAC "00:00:00:00:00:02"
+
+#define XDP_RSS_TYPE_L4 BIT(3)
 
 struct xsk {
 	void *umem_area;
@@ -119,90 +125,28 @@ static void close_xsk(struct xsk *xsk)
 	munmap(xsk->umem_area, UMEM_SIZE);
 }
 
-static void ip_csum(struct iphdr *iph)
+static int generate_packet_udp(void)
 {
-	__u32 sum = 0;
-	__u16 *p;
-	int i;
-
-	iph->check = 0;
-	p = (void *)iph;
-	for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
-		sum += p[i];
-
-	while (sum >> 16)
-		sum = (sum & 0xffff) + (sum >> 16);
-
-	iph->check = ~sum;
-}
-
-static int generate_packet(struct xsk *xsk, __u16 dst_port)
-{
-	struct xdp_desc *tx_desc;
-	struct udphdr *udph;
-	struct ethhdr *eth;
-	struct iphdr *iph;
-	void *data;
-	__u32 idx;
-	int ret;
-
-	ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx);
-	if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve"))
-		return -1;
-
-	tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
-	tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE;
-	printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
-	data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);
-
-	eth = data;
-	iph = (void *)(eth + 1);
-	udph = (void *)(iph + 1);
-
-	memcpy(eth->h_dest, "\x00\x00\x00\x00\x00\x02", ETH_ALEN);
-	memcpy(eth->h_source, "\x00\x00\x00\x00\x00\x01", ETH_ALEN);
-	eth->h_proto = htons(ETH_P_IP);
-
-	iph->version = 0x4;
-	iph->ihl = 0x5;
-	iph->tos = 0x9;
-	iph->tot_len = htons(sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES);
-	iph->id = 0;
-	iph->frag_off = 0;
-	iph->ttl = 0;
-	iph->protocol = IPPROTO_UDP;
-	ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
-	ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
-	ip_csum(iph);
-
-	udph->source = htons(AF_XDP_SOURCE_PORT);
-	udph->dest = htons(dst_port);
-	udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
-	udph->check = 0;
-
-	memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);
-
-	tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
-	xsk_ring_prod__submit(&xsk->tx, 1);
-
-	ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
-	if (!ASSERT_GE(ret, 0, "sendto"))
-		return ret;
-
-	return 0;
-}
-
-static void complete_tx(struct xsk *xsk)
-{
-	__u32 idx;
-	__u64 addr;
-
-	if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
-		addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);
-
-		printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);
-		xsk_ring_cons__release(&xsk->comp, 1);
-	}
+	char udp_payload[UDP_PAYLOAD_BYTES];
+	struct sockaddr_in rx_addr;
+	int sock_fd, err = 0;
+
+	/* Build a packet */
+	memset(udp_payload, 0xAA, UDP_PAYLOAD_BYTES);
+	rx_addr.sin_addr.s_addr = inet_addr(RX_ADDR);
+	rx_addr.sin_family = AF_INET;
+	rx_addr.sin_port = htons(UDP_SOURCE_PORT);
+
+	sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+	if (!ASSERT_GE(sock_fd, 0, "socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)"))
+		return sock_fd;
+
+	err = sendto(sock_fd, udp_payload, UDP_PAYLOAD_BYTES, MSG_DONTWAIT,
+		     (void *)&rx_addr, sizeof(rx_addr));
+	ASSERT_GE(err, 0, "sendto");
+
+	close(sock_fd);
+	return err;
 }
 
 static void refill_rx(struct xsk *xsk, __u64 addr)
@@ -268,7 +212,8 @@ static int verify_xsk_metadata(struct xsk *xsk)
 	if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
 		return -1;
 
-	ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");
+	if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
+		return -1;
 
 	xsk_ring_cons__release(&xsk->rx, 1);
 	refill_rx(xsk, comp_addr);
@@ -284,36 +229,38 @@ void test_xdp_metadata(void)
 	struct nstoken *tok = NULL;
 	__u32 queue_id = QUEUE_ID;
 	struct bpf_map *prog_arr;
-	struct xsk tx_xsk = {};
 	struct xsk rx_xsk = {};
 	__u32 val, key = 0;
 	int retries = 10;
 	int rx_ifindex;
-	int tx_ifindex;
 	int sock_fd;
 	int ret;
 
-	/* Setup new networking namespace, with a veth pair. */
+	/* Setup new networking namespaces, with a veth pair. */
 
-	SYS(out, "ip netns add xdp_metadata");
-	tok = open_netns("xdp_metadata");
+	SYS(out, "ip netns add " TX_NETNS_NAME);
+	SYS(out, "ip netns add " RX_NETNS_NAME);
+
+	tok = open_netns(TX_NETNS_NAME);
 	SYS(out, "ip link add numtxqueues 1 numrxqueues 1 " TX_NAME
 	    " type veth peer " RX_NAME " numtxqueues 1 numrxqueues 1");
-	SYS(out, "ip link set dev " TX_NAME " address 00:00:00:00:00:01");
-	SYS(out, "ip link set dev " RX_NAME " address 00:00:00:00:00:02");
+	SYS(out, "ip link set " RX_NAME " netns " RX_NETNS_NAME);
+
+	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
 	SYS(out, "ip link set dev " TX_NAME " up");
-	SYS(out, "ip link set dev " RX_NAME " up");
 	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
-	SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
 
-	rx_ifindex = if_nametoindex(RX_NAME);
-	tx_ifindex = if_nametoindex(TX_NAME);
+	/* Avoid ARP calls */
+	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
+	close_netns(tok);
 
-	/* Setup separate AF_XDP for TX and RX interfaces. */
+	tok = open_netns(RX_NETNS_NAME);
+	SYS(out, "ip link set dev " RX_NAME " address " RX_MAC);
+	SYS(out, "ip link set dev " RX_NAME " up");
+	SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
+	rx_ifindex = if_nametoindex(RX_NAME);
 
-	ret = open_xsk(tx_ifindex, &tx_xsk);
-	if (!ASSERT_OK(ret, "open_xsk(TX_NAME)"))
-		goto out;
+	/* Setup AF_XDP for RX interface. */
 
 	ret = open_xsk(rx_ifindex, &rx_xsk);
 	if (!ASSERT_OK(ret, "open_xsk(RX_NAME)"))
@@ -353,19 +300,20 @@ void test_xdp_metadata(void)
 	ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
 	if (!ASSERT_GE(ret, 0, "bpf_map_update_elem"))
 		goto out;
+	close_netns(tok);
 
 	/* Send packet destined to RX AF_XDP socket. */
-	if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
-		       "generate AF_XDP_CONSUMER_PORT"))
+	tok = open_netns(TX_NETNS_NAME);
+	if (!ASSERT_GE(generate_packet_udp(), 0, "generate UDP packet"))
 		goto out;
+	close_netns(tok);
 
 	/* Verify AF_XDP RX packet has proper metadata. */
+	tok = open_netns(RX_NETNS_NAME);
 	if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk), 0,
 		       "verify_xsk_metadata"))
 		goto out;
 
-	complete_tx(&tx_xsk);
-
 	/* Make sure freplace correctly picks up original bound device
 	 * and doesn't crash.
 	 */
@@ -382,12 +330,15 @@ void test_xdp_metadata(void)
 
 	if (!ASSERT_OK(xdp_metadata2__attach(bpf_obj2), "attach freplace"))
 		goto out;
+	close_netns(tok);
 
 	/* Send packet to trigger . */
-	if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
-		       "generate freplace packet"))
+	tok = open_netns(TX_NETNS_NAME);
+	if (!ASSERT_GE(generate_packet_udp(), 0, "generate freplace packet"))
 		goto out;
+	close_netns(tok);
 
+	tok = open_netns(RX_NETNS_NAME);
 	while (!retries--) {
 		if (bpf_obj2->bss->called)
 			break;
@@ -397,10 +348,10 @@ void test_xdp_metadata(void)
 
 out:
 	close_xsk(&rx_xsk);
-	close_xsk(&tx_xsk);
 	xdp_metadata2__destroy(bpf_obj2);
 	xdp_metadata__destroy(bpf_obj);
 	if (tok)
 		close_netns(tok);
-	SYS_NOFAIL("ip netns del xdp_metadata");
+	SYS_NOFAIL("ip netns del " RX_NETNS_NAME);
+	SYS_NOFAIL("ip netns del " TX_NETNS_NAME);
 }
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto in xdp_metadata

[Larysa Zaremba]

Verify, whether VLAN tag and proto are set correctly.

To simulate "stripped" VLAN tag on veth, send test packet from VLAN
interface.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 22 +++++++++++++++++--
 .../selftests/bpf/progs/xdp_metadata.c        |  4 ++++
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 1877e5c6d6c7..6665cf0c59cc 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -38,7 +38,15 @@
 #define TX_MAC "00:00:00:00:00:01"
 #define RX_MAC "00:00:00:00:00:02"
 
+#define VLAN_ID 59
+#define VLAN_ID_STR "59"
+#define VLAN_PROTO "802.1Q"
+#define VLAN_PID htons(ETH_P_8021Q)
+#define TX_NAME_VLAN TX_NAME "." VLAN_ID_STR
+#define RX_NAME_VLAN RX_NAME "." VLAN_ID_STR
+
 #define XDP_RSS_TYPE_L4 BIT(3)
+#define VLAN_VID_MASK 0xfff
 
 struct xsk {
 	void *umem_area;
@@ -215,6 +223,12 @@ static int verify_xsk_metadata(struct xsk *xsk)
 	if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
 		return -1;
 
+	if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
+		return -1;
+
+	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
+		return -1;
+
 	xsk_ring_cons__release(&xsk->rx, 1);
 	refill_rx(xsk, comp_addr);
 
@@ -248,10 +262,14 @@ void test_xdp_metadata(void)
 
 	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
 	SYS(out, "ip link set dev " TX_NAME " up");
-	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
+
+	SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
+		 " type vlan proto " VLAN_PROTO " id " VLAN_ID_STR);
+	SYS(out, "ip link set dev " TX_NAME_VLAN " up");
+	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
 
 	/* Avoid ARP calls */
-	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
+	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
 	close_netns(tok);
 
 	tok = open_netns(RX_NETNS_NAME);
diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
index d151d406a123..d3111649170e 100644
--- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
@@ -23,6 +23,9 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
 					 __u64 *timestamp) __ksym;
 extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
 				    enum xdp_rss_hash_type *rss_type) __ksym;
+extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
+					__u16 *vlan_tci,
+					__be16 *vlan_proto) __ksym;
 
 SEC("xdp")
 int rx(struct xdp_md *ctx)
@@ -57,6 +60,7 @@ int rx(struct xdp_md *ctx)
 		meta->rx_timestamp = 1;
 
 	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
+	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
 
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
 }
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v3 21/21] selftests/bpf: check checksum state in xdp_metadata

[Larysa Zaremba]

Verify, whether kfunc in xdp_metadata test correctly returns partial
checksum status and offsets.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 30 +++++++++++++++++++
 .../selftests/bpf/progs/xdp_metadata.c        |  6 ++++
 2 files changed, 36 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
index 6665cf0c59cc..c0ce66703696 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -47,6 +47,7 @@
 
 #define XDP_RSS_TYPE_L4 BIT(3)
 #define VLAN_VID_MASK 0xfff
+#define XDP_CHECKSUM_PARTIAL BIT(3)
 
 struct xsk {
 	void *umem_area;
@@ -168,6 +169,32 @@ static void refill_rx(struct xsk *xsk, __u64 addr)
 	}
 }
 
+struct partial_csum_info {
+	__u16 csum_start;
+	__u16 csum_offset;
+};
+
+static bool assert_checksum_ok(struct xdp_meta *meta)
+{
+	struct partial_csum_info *info;
+	u32 csum_start, csum_offset;
+
+	if (!ASSERT_EQ(meta->rx_csum_status, XDP_CHECKSUM_PARTIAL,
+		       "rx_csum_status"))
+		return false;
+
+	csum_start = sizeof(struct ethhdr) + sizeof(struct iphdr);
+	csum_offset = offsetof(struct udphdr, check);
+	info = (void *)&meta->rx_csum_info;
+
+	if (!ASSERT_EQ(info->csum_start, csum_start, "rx csum_start"))
+		return false;
+	if (!ASSERT_EQ(info->csum_offset, csum_offset, "rx csum_offset"))
+		return false;
+
+	return true;
+}
+
 static int verify_xsk_metadata(struct xsk *xsk)
 {
 	const struct xdp_desc *rx_desc;
@@ -229,6 +256,9 @@ static int verify_xsk_metadata(struct xsk *xsk)
 	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
 		return -1;
 
+	if (!assert_checksum_ok(meta))
+		return -1;
+
 	xsk_ring_cons__release(&xsk->rx, 1);
 	refill_rx(xsk, comp_addr);
 
diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
index d3111649170e..e79667a0726e 100644
--- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
@@ -26,6 +26,9 @@ extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
 extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
 					__u16 *vlan_tci,
 					__be16 *vlan_proto) __ksym;
+extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
+				    enum xdp_csum_status *csum_status,
+				    union xdp_csum_info *csum_info) __ksym;
 
 SEC("xdp")
 int rx(struct xdp_md *ctx)
@@ -62,6 +65,9 @@ int rx(struct xdp_md *ctx)
 	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
 	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
 
+	bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
+				 (void *)&meta->rx_csum_info);
+
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
 }
 
-- 
2.41.0

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Alexei Starovoitov]

On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> Implement .xmo_rx_csum callback to allow XDP code to determine,
> whether HW has validated any checksums.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> index 54685d0747aa..6647a7e55ac8 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
>  	return 0;
>  }
>  
> +/**
> + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> + * @ctx: XDP buff pointer
> + * @csum_status: destination address
> + * @csum_info: destination address
> + *
> + * Copy HW checksum level (if was checked) to the destination address.
> + */
> +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> +			   enum xdp_csum_status *csum_status,
> +			   union xdp_csum_info *csum_info)
> +{
> +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> +	const union ice_32b_rx_flex_desc *eop_desc;
> +	enum ice_rx_csum_status status;
> +	u16 ptype;
> +
> +	eop_desc = xdp_ext->pkt_ctx.eop_desc;
> +	ptype = ice_get_ptype(eop_desc);
> +
> +	status = ice_get_rx_csum_status(eop_desc, ptype);
> +	if (status & ICE_RX_CSUM_NONE)
> +		return -ENODATA;
> +
> +	*csum_status = ice_rx_csum_lvl(status) + 1;
> +	return 0;
> +}

and xdp_csum_info from previous patch left uninitialized?
What was the point adding it then?

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Willem de Bruijn]

Larysa Zaremba wrote:
> Implement functionality that enables drivers to expose to XDP code checksum
> information that consists of:
> 
> - Checksum status - bitfield that consists of
>   - number of consecutive validated checksums. This is almost the same as
>     csum_level in skb, but starts with 1. Enum names for those bits still
>     use checksum level concept, so it is less confusing for driver
>     developers.
>   - Is checksum partial? This bit cannot coexist with any other
>   - Is there a complete checksum available?
> - Additional checksum data, a union of:
>   - checksum start and offset, if checksum is partial
>   - complete checksum, if available
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> ---
>  Documentation/networking/xdp-rx-metadata.rst |  3 ++
>  include/linux/netdevice.h                    |  3 ++
>  include/net/xdp.h                            | 46 ++++++++++++++++++++
>  kernel/bpf/offload.c                         |  2 +
>  net/core/xdp.c                               | 23 ++++++++++
>  5 files changed, 77 insertions(+)
> 
> diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> index ea6dd79a21d3..7f056a44f682 100644
> --- a/Documentation/networking/xdp-rx-metadata.rst
> +++ b/Documentation/networking/xdp-rx-metadata.rst
> @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
>  .. kernel-doc:: net/core/xdp.c
>     :identifiers: bpf_xdp_metadata_rx_vlan_tag
>  
> +.. kernel-doc:: net/core/xdp.c
> +   :identifiers: bpf_xdp_metadata_rx_csum
> +
>  An XDP program can use these kfuncs to read the metadata into stack
>  variables for its own consumption. Or, to pass the metadata on to other
>  consumers, an XDP program can store it into the metadata area carried
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 1749f4f75c64..4f6da36ac123 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
>  			       enum xdp_rss_hash_type *rss_type);
>  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
>  				   __be16 *vlan_proto);
> +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> +			       enum xdp_csum_status *csum_status,
> +			       union xdp_csum_info *csum_info);
>  };
>  
>  /**
> diff --git a/include/net/xdp.h b/include/net/xdp.h
> index 89c58f56ffc6..2b7a7d678ff4 100644
> --- a/include/net/xdp.h
> +++ b/include/net/xdp.h
> @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
>  			   bpf_xdp_metadata_rx_hash) \
>  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
>  			   bpf_xdp_metadata_rx_vlan_tag) \
> +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> +			   bpf_xdp_metadata_rx_csum) \
>  
>  enum {
>  #define XDP_METADATA_KFUNC(name, _) name,
> @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
>  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
>  };
>  
> +union xdp_csum_info {
> +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> +	 * valid, but was never calculated, TX device has to do this,
> +	 * starting from csum_start packet byte.
> +	 * Any preceding checksums are also considered valid.
> +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> +	 */
> +	struct {
> +		u16 csum_start;
> +		u16 csum_offset;
> +	};
> +
> +	/* Checksum, calculated over the whole packet.
> +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> +	 */
> +	u32 checksum;
> +};
> +
> +enum xdp_csum_status {
> +	/* HW had parsed several transport headers and validated their
> +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> +	 * 3 least significat bytes contain number of consecutive checksum,

typo: significant

(I did not scan for typos, just came across this when trying to understand
the skb->csum_level + 1 trick. Probably good to run a spell check).

> +	 * starting with the outermost, reported by hardware as valid.
> +	 * ``sk_buff`` checksum level (``csum_level``) notation is provided
> +	 * for driver developers.
> +	 */
> +	XDP_CHECKSUM_VALID_LVL0		= 1,	/* 1 outermost checksum */
> +	XDP_CHECKSUM_VALID_LVL1		= 2,	/* 2 outermost checksums */
> +	XDP_CHECKSUM_VALID_LVL2		= 3,	/* 3 outermost checksums */
> +	XDP_CHECKSUM_VALID_LVL3		= 4,	/* 4 outermost checksums */
> +	XDP_CHECKSUM_VALID_NUM_MASK	= GENMASK(2, 0),
> +	XDP_CHECKSUM_VALID		= XDP_CHECKSUM_VALID_NUM_MASK,
> +
> +	/* Occurs if packet is sent virtually (between Linux VMs / containers)
> +	 * This status cannot coexist with any other.
> +	 * Refer to ``csum_start`` and ``csum_offset`` in ``xdp_csum_info``
> +	 * for more information.
> +	 */
> +	XDP_CHECKSUM_PARTIAL	= BIT(3),
> +
> +	/* Checksum, calculated over the entire packet is provided */
> +	XDP_CHECKSUM_COMPLETE	= BIT(4),
> +};
> +
>  #ifdef CONFIG_NET
>  u32 bpf_xdp_metadata_kfunc_id(int id);
>  bool bpf_dev_bound_kfunc_id(u32 btf_id);
> diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
> index 986e7becfd42..f60a6add5273 100644
> --- a/kernel/bpf/offload.c
> +++ b/kernel/bpf/offload.c
> @@ -850,6 +850,8 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
>  		p = ops->xmo_rx_hash;
>  	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_VLAN_TAG))
>  		p = ops->xmo_rx_vlan_tag;
> +	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_CSUM))
> +		p = ops->xmo_rx_csum;
>  out:
>  	up_read(&bpf_devs_lock);
>  
> diff --git a/net/core/xdp.c b/net/core/xdp.c
> index 8b55419d332e..d4ea54046afc 100644
> --- a/net/core/xdp.c
> +++ b/net/core/xdp.c
> @@ -772,6 +772,29 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
>  	return -EOPNOTSUPP;
>  }
>  
> +/**
> + * bpf_xdp_metadata_rx_csum - Get checksum status with additional info.
> + * @ctx: XDP context pointer.
> + * @csum_status: Destination for checksum status.
> + * @csum_info: Destination for complete checksum or partial checksum offset.
> + *
> + * Status (@csum_status) is a bitfield that informs, what checksum
> + * processing was performed. Additional results of such processing,
> + * such as complete checksum or partial checksum offsets,
> + * are passed as info (@csum_info).
> + *
> + * Return:
> + * * Returns 0 on success or ``-errno`` on error.
> + * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
> + * * ``-ENODATA``    : Checksum status is unknown
> + */
> +__bpf_kfunc int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> +					 enum xdp_csum_status *csum_status,
> +					 union xdp_csum_info *csum_info)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
>  __diag_pop();
>  
>  BTF_SET8_START(xdp_metadata_kfunc_ids)
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Willem de Bruijn]

Alexei Starovoitov wrote:
> On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > whether HW has validated any checksums.
> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > ---
> >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> >  1 file changed, 29 insertions(+)
> > 
> > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > index 54685d0747aa..6647a7e55ac8 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> >  	return 0;
> >  }
> >  
> > +/**
> > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > + * @ctx: XDP buff pointer
> > + * @csum_status: destination address
> > + * @csum_info: destination address
> > + *
> > + * Copy HW checksum level (if was checked) to the destination address.
> > + */
> > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > +			   enum xdp_csum_status *csum_status,
> > +			   union xdp_csum_info *csum_info)
> > +{
> > +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > +	const union ice_32b_rx_flex_desc *eop_desc;
> > +	enum ice_rx_csum_status status;
> > +	u16 ptype;
> > +
> > +	eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > +	ptype = ice_get_ptype(eop_desc);
> > +
> > +	status = ice_get_rx_csum_status(eop_desc, ptype);
> > +	if (status & ICE_RX_CSUM_NONE)
> > +		return -ENODATA;
> > +
> > +	*csum_status = ice_rx_csum_lvl(status) + 1;
> > +	return 0;
> > +}
> 
> and xdp_csum_info from previous patch left uninitialized?
> What was the point adding it then?

I suppose this driver only returns CHECKSUM_NONE or
CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.

In general the layout makes sense to me, and +1 on supporting
other drivers that do return CHECKSUM_COMPLETE or CHECKSUM_PARTIAL
rigth from the start.

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Zaremba, Larysa]

On Wed, Jul 19, 2023 at 05:51:17PM -0400, Willem de Bruijn wrote:
> Alexei Starovoitov wrote:
> > On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > > whether HW has validated any checksums.
> > > 
> > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > ---
> > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> > >  1 file changed, 29 insertions(+)
> > > 
> > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > index 54685d0747aa..6647a7e55ac8 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > >  	return 0;
> > >  }
> > >  
> > > +/**
> > > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > > + * @ctx: XDP buff pointer
> > > + * @csum_status: destination address
> > > + * @csum_info: destination address
> > > + *
> > > + * Copy HW checksum level (if was checked) to the destination address.
> > > + */
> > > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > > +			   enum xdp_csum_status *csum_status,
> > > +			   union xdp_csum_info *csum_info)
> > > +{
> > > +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > > +	const union ice_32b_rx_flex_desc *eop_desc;
> > > +	enum ice_rx_csum_status status;
> > > +	u16 ptype;
> > > +
> > > +	eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > > +	ptype = ice_get_ptype(eop_desc);
> > > +
> > > +	status = ice_get_rx_csum_status(eop_desc, ptype);
> > > +	if (status & ICE_RX_CSUM_NONE)
> > > +		return -ENODATA;
> > > +
> > > +	*csum_status = ice_rx_csum_lvl(status) + 1;
> > > +	return 0;
> > > +}
> > 
> > and xdp_csum_info from previous patch left uninitialized?
> > What was the point adding it then?
> 
> I suppose this driver only returns CHECKSUM_NONE or
> CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.
> 

Yes, correct, current ice HW cannot produce complete checksum,
so only CHECKSUM_UNNECESSARY for known protocols, CHECKSUM_NONE otherwise,
nothing to initialize csum_info with in either case.

xdp_csum_info is initialized in veth implementation though, but only 
csum_start/offset, so complete XDP checksum has no users in this patchset.
Is this a problem?

In previous version I had CHECKSUM_UNNECESSARY-only kfunc, but I think everyone 
has agreed, csum hint kfunc should give more comprehensive output.

> In general the layout makes sense to me, and +1 on supporting
> other drivers that do return CHECKSUM_COMPLETE or CHECKSUM_PARTIAL
> rigth from the start.
> 

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Zaremba, Larysa]

On Wed, Jul 19, 2023 at 05:42:04PM -0400, Willem de Bruijn wrote:
> Larysa Zaremba wrote:
> > Implement functionality that enables drivers to expose to XDP code checksum
> > information that consists of:
> > 
> > - Checksum status - bitfield that consists of
> >   - number of consecutive validated checksums. This is almost the same as
> >     csum_level in skb, but starts with 1. Enum names for those bits still
> >     use checksum level concept, so it is less confusing for driver
> >     developers.
> >   - Is checksum partial? This bit cannot coexist with any other
> >   - Is there a complete checksum available?
> > - Additional checksum data, a union of:
> >   - checksum start and offset, if checksum is partial
> >   - complete checksum, if available
> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > ---
> >  Documentation/networking/xdp-rx-metadata.rst |  3 ++
> >  include/linux/netdevice.h                    |  3 ++
> >  include/net/xdp.h                            | 46 ++++++++++++++++++++
> >  kernel/bpf/offload.c                         |  2 +
> >  net/core/xdp.c                               | 23 ++++++++++
> >  5 files changed, 77 insertions(+)
> > 
> > diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> > index ea6dd79a21d3..7f056a44f682 100644
> > --- a/Documentation/networking/xdp-rx-metadata.rst
> > +++ b/Documentation/networking/xdp-rx-metadata.rst
> > @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
> >  .. kernel-doc:: net/core/xdp.c
> >     :identifiers: bpf_xdp_metadata_rx_vlan_tag
> >  
> > +.. kernel-doc:: net/core/xdp.c
> > +   :identifiers: bpf_xdp_metadata_rx_csum
> > +
> >  An XDP program can use these kfuncs to read the metadata into stack
> >  variables for its own consumption. Or, to pass the metadata on to other
> >  consumers, an XDP program can store it into the metadata area carried
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index 1749f4f75c64..4f6da36ac123 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
> >  			       enum xdp_rss_hash_type *rss_type);
> >  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> >  				   __be16 *vlan_proto);
> > +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> > +			       enum xdp_csum_status *csum_status,
> > +			       union xdp_csum_info *csum_info);
> >  };
> >  
> >  /**
> > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > index 89c58f56ffc6..2b7a7d678ff4 100644
> > --- a/include/net/xdp.h
> > +++ b/include/net/xdp.h
> > @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
> >  			   bpf_xdp_metadata_rx_hash) \
> >  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> >  			   bpf_xdp_metadata_rx_vlan_tag) \
> > +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> > +			   bpf_xdp_metadata_rx_csum) \
> >  
> >  enum {
> >  #define XDP_METADATA_KFUNC(name, _) name,
> > @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
> >  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
> >  };
> >  
> > +union xdp_csum_info {
> > +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> > +	 * valid, but was never calculated, TX device has to do this,
> > +	 * starting from csum_start packet byte.
> > +	 * Any preceding checksums are also considered valid.
> > +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> > +	 */
> > +	struct {
> > +		u16 csum_start;
> > +		u16 csum_offset;
> > +	};
> > +
> > +	/* Checksum, calculated over the whole packet.
> > +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> > +	 */
> > +	u32 checksum;
> > +};
> > +
> > +enum xdp_csum_status {
> > +	/* HW had parsed several transport headers and validated their
> > +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> > +	 * 3 least significat bytes contain number of consecutive checksum,
> 
> typo: significant
> 
> (I did not scan for typos, just came across this when trying to understand
> the skb->csum_level + 1 trick. Probably good to run a spell check).
> 

Thanks! Will fix.

> > +	 * starting with the outermost, reported by hardware as valid.
> > +	 * ``sk_buff`` checksum level (``csum_level``) notation is provided
> > +	 * for driver developers.
> > +	 */
> > +	XDP_CHECKSUM_VALID_LVL0		= 1,	/* 1 outermost checksum */
> > +	XDP_CHECKSUM_VALID_LVL1		= 2,	/* 2 outermost checksums */
> > +	XDP_CHECKSUM_VALID_LVL2		= 3,	/* 3 outermost checksums */
> > +	XDP_CHECKSUM_VALID_LVL3		= 4,	/* 4 outermost checksums */
> > +	XDP_CHECKSUM_VALID_NUM_MASK	= GENMASK(2, 0),
> > +	XDP_CHECKSUM_VALID		= XDP_CHECKSUM_VALID_NUM_MASK,
> > +
> > +	/* Occurs if packet is sent virtually (between Linux VMs / containers)
> > +	 * This status cannot coexist with any other.
> > +	 * Refer to ``csum_start`` and ``csum_offset`` in ``xdp_csum_info``
> > +	 * for more information.
> > +	 */
> > +	XDP_CHECKSUM_PARTIAL	= BIT(3),
> > +
> > +	/* Checksum, calculated over the entire packet is provided */
> > +	XDP_CHECKSUM_COMPLETE	= BIT(4),
> > +};
> > +
> >  #ifdef CONFIG_NET
> >  u32 bpf_xdp_metadata_kfunc_id(int id);
> >  bool bpf_dev_bound_kfunc_id(u32 btf_id);
> > diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
> > index 986e7becfd42..f60a6add5273 100644
> > --- a/kernel/bpf/offload.c
> > +++ b/kernel/bpf/offload.c
> > @@ -850,6 +850,8 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
> >  		p = ops->xmo_rx_hash;
> >  	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_VLAN_TAG))
> >  		p = ops->xmo_rx_vlan_tag;
> > +	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_CSUM))
> > +		p = ops->xmo_rx_csum;
> >  out:
> >  	up_read(&bpf_devs_lock);
> >  
> > diff --git a/net/core/xdp.c b/net/core/xdp.c
> > index 8b55419d332e..d4ea54046afc 100644
> > --- a/net/core/xdp.c
> > +++ b/net/core/xdp.c
> > @@ -772,6 +772,29 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> >  	return -EOPNOTSUPP;
> >  }
> >  
> > +/**
> > + * bpf_xdp_metadata_rx_csum - Get checksum status with additional info.
> > + * @ctx: XDP context pointer.
> > + * @csum_status: Destination for checksum status.
> > + * @csum_info: Destination for complete checksum or partial checksum offset.
> > + *
> > + * Status (@csum_status) is a bitfield that informs, what checksum
> > + * processing was performed. Additional results of such processing,
> > + * such as complete checksum or partial checksum offsets,
> > + * are passed as info (@csum_info).
> > + *
> > + * Return:
> > + * * Returns 0 on success or ``-errno`` on error.
> > + * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
> > + * * ``-ENODATA``    : Checksum status is unknown
> > + */
> > +__bpf_kfunc int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> > +					 enum xdp_csum_status *csum_status,
> > +					 union xdp_csum_info *csum_info)
> > +{
> > +	return -EOPNOTSUPP;
> > +}
> > +
> >  __diag_pop();
> >  
> >  BTF_SET8_START(xdp_metadata_kfunc_ids)
> > -- 
> > 2.41.0
> > 
> 
> 

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 09:57:05AM +0000, Zaremba, Larysa wrote:
> On Wed, Jul 19, 2023 at 05:42:04PM -0400, Willem de Bruijn wrote:
> > Larysa Zaremba wrote:
> > > Implement functionality that enables drivers to expose to XDP code checksum
> > > information that consists of:
> > > 
> > > - Checksum status - bitfield that consists of
> > >   - number of consecutive validated checksums. This is almost the same as
> > >     csum_level in skb, but starts with 1. Enum names for those bits still
> > >     use checksum level concept, so it is less confusing for driver
> > >     developers.
> > >   - Is checksum partial? This bit cannot coexist with any other
> > >   - Is there a complete checksum available?
> > > - Additional checksum data, a union of:
> > >   - checksum start and offset, if checksum is partial
> > >   - complete checksum, if available
> > > 
> > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > ---
> > >  Documentation/networking/xdp-rx-metadata.rst |  3 ++
> > >  include/linux/netdevice.h                    |  3 ++
> > >  include/net/xdp.h                            | 46 ++++++++++++++++++++
> > >  kernel/bpf/offload.c                         |  2 +
> > >  net/core/xdp.c                               | 23 ++++++++++
> > >  5 files changed, 77 insertions(+)
> > > 
> > > diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> > > index ea6dd79a21d3..7f056a44f682 100644
> > > --- a/Documentation/networking/xdp-rx-metadata.rst
> > > +++ b/Documentation/networking/xdp-rx-metadata.rst
> > > @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
> > >  .. kernel-doc:: net/core/xdp.c
> > >     :identifiers: bpf_xdp_metadata_rx_vlan_tag
> > >  
> > > +.. kernel-doc:: net/core/xdp.c
> > > +   :identifiers: bpf_xdp_metadata_rx_csum
> > > +
> > >  An XDP program can use these kfuncs to read the metadata into stack
> > >  variables for its own consumption. Or, to pass the metadata on to other
> > >  consumers, an XDP program can store it into the metadata area carried
> > > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > index 1749f4f75c64..4f6da36ac123 100644
> > > --- a/include/linux/netdevice.h
> > > +++ b/include/linux/netdevice.h
> > > @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
> > >  			       enum xdp_rss_hash_type *rss_type);
> > >  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> > >  				   __be16 *vlan_proto);
> > > +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> > > +			       enum xdp_csum_status *csum_status,
> > > +			       union xdp_csum_info *csum_info);
> > >  };
> > >  
> > >  /**
> > > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > > index 89c58f56ffc6..2b7a7d678ff4 100644
> > > --- a/include/net/xdp.h
> > > +++ b/include/net/xdp.h
> > > @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
> > >  			   bpf_xdp_metadata_rx_hash) \
> > >  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> > >  			   bpf_xdp_metadata_rx_vlan_tag) \
> > > +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> > > +			   bpf_xdp_metadata_rx_csum) \
> > >  
> > >  enum {
> > >  #define XDP_METADATA_KFUNC(name, _) name,
> > > @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
> > >  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
> > >  };
> > >  
> > > +union xdp_csum_info {
> > > +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> > > +	 * valid, but was never calculated, TX device has to do this,
> > > +	 * starting from csum_start packet byte.
> > > +	 * Any preceding checksums are also considered valid.
> > > +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> > > +	 */
> > > +	struct {
> > > +		u16 csum_start;
> > > +		u16 csum_offset;
> > > +	};
> > > +
> > > +	/* Checksum, calculated over the whole packet.
> > > +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> > > +	 */
> > > +	u32 checksum;
> > > +};
> > > +
> > > +enum xdp_csum_status {
> > > +	/* HW had parsed several transport headers and validated their
> > > +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> > > +	 * 3 least significat bytes contain number of consecutive checksum,
> > 
> > typo: significant
> > 
> > (I did not scan for typos, just came across this when trying to understand
> > the skb->csum_level + 1 trick. Probably good to run a spell check).
> >

Oh, and about skb->csum_level + 1, maybe this way it would be more 
understandable: XDP_CHECKSUM_VALID_LVL0 + skb->csum_level?

Using number of valid checksums (starts with 1) instead of checksum level 
(starts with 0) is a debatable decision, but I have decided to go with it under 
2 assumptions:

- the only reason checksum level in skb starts with 0 is to use less bits
- checksum number would be more intuitive for XDP/AF_XDP application developers

I encourage everyone to share their opinion on that.
 
> 
> Thanks! Will fix.
> 
> > > +	 * starting with the outermost, reported by hardware as valid.
> > > +	 * ``sk_buff`` checksum level (``csum_level``) notation is provided
> > > +	 * for driver developers.
> > > +	 */
> > > +	XDP_CHECKSUM_VALID_LVL0		= 1,	/* 1 outermost checksum */
> > > +	XDP_CHECKSUM_VALID_LVL1		= 2,	/* 2 outermost checksums */
> > > +	XDP_CHECKSUM_VALID_LVL2		= 3,	/* 3 outermost checksums */
> > > +	XDP_CHECKSUM_VALID_LVL3		= 4,	/* 4 outermost checksums */
> > > +	XDP_CHECKSUM_VALID_NUM_MASK	= GENMASK(2, 0),
> > > +	XDP_CHECKSUM_VALID		= XDP_CHECKSUM_VALID_NUM_MASK,
> > > +
> > > +	/* Occurs if packet is sent virtually (between Linux VMs / containers)
> > > +	 * This status cannot coexist with any other.
> > > +	 * Refer to ``csum_start`` and ``csum_offset`` in ``xdp_csum_info``
> > > +	 * for more information.
> > > +	 */
> > > +	XDP_CHECKSUM_PARTIAL	= BIT(3),
> > > +
> > > +	/* Checksum, calculated over the entire packet is provided */
> > > +	XDP_CHECKSUM_COMPLETE	= BIT(4),
> > > +};
> > > +
> > >  #ifdef CONFIG_NET
> > >  u32 bpf_xdp_metadata_kfunc_id(int id);
> > >  bool bpf_dev_bound_kfunc_id(u32 btf_id);
> > > diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
> > > index 986e7becfd42..f60a6add5273 100644
> > > --- a/kernel/bpf/offload.c
> > > +++ b/kernel/bpf/offload.c
> > > @@ -850,6 +850,8 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
> > >  		p = ops->xmo_rx_hash;
> > >  	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_VLAN_TAG))
> > >  		p = ops->xmo_rx_vlan_tag;
> > > +	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_CSUM))
> > > +		p = ops->xmo_rx_csum;
> > >  out:
> > >  	up_read(&bpf_devs_lock);
> > >  
> > > diff --git a/net/core/xdp.c b/net/core/xdp.c
> > > index 8b55419d332e..d4ea54046afc 100644
> > > --- a/net/core/xdp.c
> > > +++ b/net/core/xdp.c
> > > @@ -772,6 +772,29 @@ __bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> > >  	return -EOPNOTSUPP;
> > >  }
> > >  
> > > +/**
> > > + * bpf_xdp_metadata_rx_csum - Get checksum status with additional info.
> > > + * @ctx: XDP context pointer.
> > > + * @csum_status: Destination for checksum status.
> > > + * @csum_info: Destination for complete checksum or partial checksum offset.
> > > + *
> > > + * Status (@csum_status) is a bitfield that informs, what checksum
> > > + * processing was performed. Additional results of such processing,
> > > + * such as complete checksum or partial checksum offsets,
> > > + * are passed as info (@csum_info).
> > > + *
> > > + * Return:
> > > + * * Returns 0 on success or ``-errno`` on error.
> > > + * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
> > > + * * ``-ENODATA``    : Checksum status is unknown
> > > + */
> > > +__bpf_kfunc int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> > > +					 enum xdp_csum_status *csum_status,
> > > +					 union xdp_csum_info *csum_info)
> > > +{
> > > +	return -EOPNOTSUPP;
> > > +}
> > > +
> > >  __diag_pop();
> > >  
> > >  BTF_SET8_START(xdp_metadata_kfunc_ids)
> > > -- 
> > > 2.41.0
> > > 
> > 
> > 
> 

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Willem de Bruijn]

Zaremba, Larysa wrote:
> On Thu, Jul 20, 2023 at 09:57:05AM +0000, Zaremba, Larysa wrote:
> > On Wed, Jul 19, 2023 at 05:42:04PM -0400, Willem de Bruijn wrote:
> > > Larysa Zaremba wrote:
> > > > Implement functionality that enables drivers to expose to XDP code checksum
> > > > information that consists of:
> > > > 
> > > > - Checksum status - bitfield that consists of
> > > >   - number of consecutive validated checksums. This is almost the same as
> > > >     csum_level in skb, but starts with 1. Enum names for those bits still
> > > >     use checksum level concept, so it is less confusing for driver
> > > >     developers.
> > > >   - Is checksum partial? This bit cannot coexist with any other
> > > >   - Is there a complete checksum available?
> > > > - Additional checksum data, a union of:
> > > >   - checksum start and offset, if checksum is partial
> > > >   - complete checksum, if available
> > > > 
> > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > ---
> > > >  Documentation/networking/xdp-rx-metadata.rst |  3 ++
> > > >  include/linux/netdevice.h                    |  3 ++
> > > >  include/net/xdp.h                            | 46 ++++++++++++++++++++
> > > >  kernel/bpf/offload.c                         |  2 +
> > > >  net/core/xdp.c                               | 23 ++++++++++
> > > >  5 files changed, 77 insertions(+)
> > > > 
> > > > diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> > > > index ea6dd79a21d3..7f056a44f682 100644
> > > > --- a/Documentation/networking/xdp-rx-metadata.rst
> > > > +++ b/Documentation/networking/xdp-rx-metadata.rst
> > > > @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
> > > >  .. kernel-doc:: net/core/xdp.c
> > > >     :identifiers: bpf_xdp_metadata_rx_vlan_tag
> > > >  
> > > > +.. kernel-doc:: net/core/xdp.c
> > > > +   :identifiers: bpf_xdp_metadata_rx_csum
> > > > +
> > > >  An XDP program can use these kfuncs to read the metadata into stack
> > > >  variables for its own consumption. Or, to pass the metadata on to other
> > > >  consumers, an XDP program can store it into the metadata area carried
> > > > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > > index 1749f4f75c64..4f6da36ac123 100644
> > > > --- a/include/linux/netdevice.h
> > > > +++ b/include/linux/netdevice.h
> > > > @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
> > > >  			       enum xdp_rss_hash_type *rss_type);
> > > >  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> > > >  				   __be16 *vlan_proto);
> > > > +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> > > > +			       enum xdp_csum_status *csum_status,
> > > > +			       union xdp_csum_info *csum_info);
> > > >  };
> > > >  
> > > >  /**
> > > > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > > > index 89c58f56ffc6..2b7a7d678ff4 100644
> > > > --- a/include/net/xdp.h
> > > > +++ b/include/net/xdp.h
> > > > @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
> > > >  			   bpf_xdp_metadata_rx_hash) \
> > > >  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> > > >  			   bpf_xdp_metadata_rx_vlan_tag) \
> > > > +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> > > > +			   bpf_xdp_metadata_rx_csum) \
> > > >  
> > > >  enum {
> > > >  #define XDP_METADATA_KFUNC(name, _) name,
> > > > @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
> > > >  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
> > > >  };
> > > >  
> > > > +union xdp_csum_info {
> > > > +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> > > > +	 * valid, but was never calculated, TX device has to do this,
> > > > +	 * starting from csum_start packet byte.
> > > > +	 * Any preceding checksums are also considered valid.
> > > > +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> > > > +	 */
> > > > +	struct {
> > > > +		u16 csum_start;
> > > > +		u16 csum_offset;
> > > > +	};
> > > > +
> > > > +	/* Checksum, calculated over the whole packet.
> > > > +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> > > > +	 */
> > > > +	u32 checksum;
> > > > +};
> > > > +
> > > > +enum xdp_csum_status {
> > > > +	/* HW had parsed several transport headers and validated their
> > > > +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> > > > +	 * 3 least significat bytes contain number of consecutive checksum,
> > > 
> > > typo: significant
> > > 
> > > (I did not scan for typos, just came across this when trying to understand
> > > the skb->csum_level + 1 trick. Probably good to run a spell check).
> > >
> 
> Oh, and about skb->csum_level + 1, maybe this way it would be more 
> understandable: XDP_CHECKSUM_VALID_LVL0 + skb->csum_level?

Agreed, that would help document the intent.
 
> Using number of valid checksums (starts with 1) instead of checksum level 
> (starts with 0) is a debatable decision, but I have decided to go with it under 
> 2 assumptions:
> 
> - the only reason checksum level in skb starts with 0 is to use less bits
> - checksum number would be more intuitive for XDP/AF_XDP application developers
> 
> I encourage everyone to share their opinion on that.

I assumed this offset by one was because csum_status zero implicitly
meant XDP_CHECKSUM_NONE. Is that not correct? That should probably
get an explicit name.

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Alexei Starovoitov]

On Thu, Jul 20, 2023 at 2:47 AM Zaremba, Larysa
<larysa.zaremba@intel.com> wrote:
>
> On Wed, Jul 19, 2023 at 05:51:17PM -0400, Willem de Bruijn wrote:
> > Alexei Starovoitov wrote:
> > > On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > > > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > > > whether HW has validated any checksums.
> > > >
> > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > ---
> > > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> > > >  1 file changed, 29 insertions(+)
> > > >
> > > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > index 54685d0747aa..6647a7e55ac8 100644
> > > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > > >   return 0;
> > > >  }
> > > >
> > > > +/**
> > > > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > > > + * @ctx: XDP buff pointer
> > > > + * @csum_status: destination address
> > > > + * @csum_info: destination address
> > > > + *
> > > > + * Copy HW checksum level (if was checked) to the destination address.
> > > > + */
> > > > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > > > +                    enum xdp_csum_status *csum_status,
> > > > +                    union xdp_csum_info *csum_info)
> > > > +{
> > > > + const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > > > + const union ice_32b_rx_flex_desc *eop_desc;
> > > > + enum ice_rx_csum_status status;
> > > > + u16 ptype;
> > > > +
> > > > + eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > > > + ptype = ice_get_ptype(eop_desc);
> > > > +
> > > > + status = ice_get_rx_csum_status(eop_desc, ptype);
> > > > + if (status & ICE_RX_CSUM_NONE)
> > > > +         return -ENODATA;
> > > > +
> > > > + *csum_status = ice_rx_csum_lvl(status) + 1;
> > > > + return 0;
> > > > +}
> > >
> > > and xdp_csum_info from previous patch left uninitialized?
> > > What was the point adding it then?
> >
> > I suppose this driver only returns CHECKSUM_NONE or
> > CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.
> >
>
> Yes, correct, current ice HW cannot produce complete checksum,
> so only CHECKSUM_UNNECESSARY for known protocols, CHECKSUM_NONE otherwise,
> nothing to initialize csum_info with in either case.
>
> xdp_csum_info is initialized in veth implementation though, but only
> csum_start/offset, so complete XDP checksum has no users in this patchset.
> Is this a problem?
>
> In previous version I had CHECKSUM_UNNECESSARY-only kfunc, but I think everyone
> has agreed, csum hint kfunc should give more comprehensive output.

csum kfunc supposed to be generic.
If for ICE it fills in one argument and for veth another then the whole
idea of generic api is not working.

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 08:14:52AM -0700, Alexei Starovoitov wrote:
> On Thu, Jul 20, 2023 at 2:47 AM Zaremba, Larysa
> <larysa.zaremba@intel.com> wrote:
> >
> > On Wed, Jul 19, 2023 at 05:51:17PM -0400, Willem de Bruijn wrote:
> > > Alexei Starovoitov wrote:
> > > > On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > > > > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > > > > whether HW has validated any checksums.
> > > > >
> > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > ---
> > > > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> > > > >  1 file changed, 29 insertions(+)
> > > > >
> > > > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > index 54685d0747aa..6647a7e55ac8 100644
> > > > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > >   return 0;
> > > > >  }
> > > > >
> > > > > +/**
> > > > > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > > > > + * @ctx: XDP buff pointer
> > > > > + * @csum_status: destination address
> > > > > + * @csum_info: destination address
> > > > > + *
> > > > > + * Copy HW checksum level (if was checked) to the destination address.
> > > > > + */
> > > > > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > > > > +                    enum xdp_csum_status *csum_status,
> > > > > +                    union xdp_csum_info *csum_info)
> > > > > +{
> > > > > + const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > > > > + const union ice_32b_rx_flex_desc *eop_desc;
> > > > > + enum ice_rx_csum_status status;
> > > > > + u16 ptype;
> > > > > +
> > > > > + eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > > > > + ptype = ice_get_ptype(eop_desc);
> > > > > +
> > > > > + status = ice_get_rx_csum_status(eop_desc, ptype);
> > > > > + if (status & ICE_RX_CSUM_NONE)
> > > > > +         return -ENODATA;
> > > > > +
> > > > > + *csum_status = ice_rx_csum_lvl(status) + 1;

I'll duplicate an improved version of this line from another thread in case it 
could help with the comprehension during review:

*csum_status = XDP_CHECKSUM_VALID_LVL0 + ice_rx_csum_lvl(status);

> > > > > + return 0;
> > > > > +}
> > > >
> > > > and xdp_csum_info from previous patch left uninitialized?
> > > > What was the point adding it then?
> > >
> > > I suppose this driver only returns CHECKSUM_NONE or
> > > CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.
> > >
> >
> > Yes, correct, current ice HW cannot produce complete checksum,
> > so only CHECKSUM_UNNECESSARY for known protocols, CHECKSUM_NONE otherwise,
> > nothing to initialize csum_info with in either case.
> >
> > xdp_csum_info is initialized in veth implementation though, but only
> > csum_start/offset, so complete XDP checksum has no users in this patchset.
> > Is this a problem?
> >
> > In previous version I had CHECKSUM_UNNECESSARY-only kfunc, but I think everyone
> > has agreed, csum hint kfunc should give more comprehensive output.
> 
> csum kfunc supposed to be generic.
> If for ICE it fills in one argument and for veth another then the whole
> idea of generic api is not working.

Both ice and veth fill in the csum_status, the need to fill in the csum_info is 
determined by the status. I don not see a problem with that.

Maybe you have an issue with putting a valid checksum number into a status 
instead of info? Please clarify.

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 09:55:16AM -0400, Willem de Bruijn wrote:
> Zaremba, Larysa wrote:
> > On Thu, Jul 20, 2023 at 09:57:05AM +0000, Zaremba, Larysa wrote:
> > > On Wed, Jul 19, 2023 at 05:42:04PM -0400, Willem de Bruijn wrote:
> > > > Larysa Zaremba wrote:
> > > > > Implement functionality that enables drivers to expose to XDP code checksum
> > > > > information that consists of:
> > > > > 
> > > > > - Checksum status - bitfield that consists of
> > > > >   - number of consecutive validated checksums. This is almost the same as
> > > > >     csum_level in skb, but starts with 1. Enum names for those bits still
> > > > >     use checksum level concept, so it is less confusing for driver
> > > > >     developers.
> > > > >   - Is checksum partial? This bit cannot coexist with any other
> > > > >   - Is there a complete checksum available?
> > > > > - Additional checksum data, a union of:
> > > > >   - checksum start and offset, if checksum is partial
> > > > >   - complete checksum, if available
> > > > > 
> > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > ---
> > > > >  Documentation/networking/xdp-rx-metadata.rst |  3 ++
> > > > >  include/linux/netdevice.h                    |  3 ++
> > > > >  include/net/xdp.h                            | 46 ++++++++++++++++++++
> > > > >  kernel/bpf/offload.c                         |  2 +
> > > > >  net/core/xdp.c                               | 23 ++++++++++
> > > > >  5 files changed, 77 insertions(+)
> > > > > 
> > > > > diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> > > > > index ea6dd79a21d3..7f056a44f682 100644
> > > > > --- a/Documentation/networking/xdp-rx-metadata.rst
> > > > > +++ b/Documentation/networking/xdp-rx-metadata.rst
> > > > > @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
> > > > >  .. kernel-doc:: net/core/xdp.c
> > > > >     :identifiers: bpf_xdp_metadata_rx_vlan_tag
> > > > >  
> > > > > +.. kernel-doc:: net/core/xdp.c
> > > > > +   :identifiers: bpf_xdp_metadata_rx_csum
> > > > > +
> > > > >  An XDP program can use these kfuncs to read the metadata into stack
> > > > >  variables for its own consumption. Or, to pass the metadata on to other
> > > > >  consumers, an XDP program can store it into the metadata area carried
> > > > > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > > > index 1749f4f75c64..4f6da36ac123 100644
> > > > > --- a/include/linux/netdevice.h
> > > > > +++ b/include/linux/netdevice.h
> > > > > @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
> > > > >  			       enum xdp_rss_hash_type *rss_type);
> > > > >  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > >  				   __be16 *vlan_proto);
> > > > > +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> > > > > +			       enum xdp_csum_status *csum_status,
> > > > > +			       union xdp_csum_info *csum_info);
> > > > >  };
> > > > >  
> > > > >  /**
> > > > > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > > > > index 89c58f56ffc6..2b7a7d678ff4 100644
> > > > > --- a/include/net/xdp.h
> > > > > +++ b/include/net/xdp.h
> > > > > @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
> > > > >  			   bpf_xdp_metadata_rx_hash) \
> > > > >  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> > > > >  			   bpf_xdp_metadata_rx_vlan_tag) \
> > > > > +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> > > > > +			   bpf_xdp_metadata_rx_csum) \
> > > > >  
> > > > >  enum {
> > > > >  #define XDP_METADATA_KFUNC(name, _) name,
> > > > > @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
> > > > >  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
> > > > >  };
> > > > >  
> > > > > +union xdp_csum_info {
> > > > > +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> > > > > +	 * valid, but was never calculated, TX device has to do this,
> > > > > +	 * starting from csum_start packet byte.
> > > > > +	 * Any preceding checksums are also considered valid.
> > > > > +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> > > > > +	 */
> > > > > +	struct {
> > > > > +		u16 csum_start;
> > > > > +		u16 csum_offset;
> > > > > +	};
> > > > > +
> > > > > +	/* Checksum, calculated over the whole packet.
> > > > > +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> > > > > +	 */
> > > > > +	u32 checksum;
> > > > > +};
> > > > > +
> > > > > +enum xdp_csum_status {
> > > > > +	/* HW had parsed several transport headers and validated their
> > > > > +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> > > > > +	 * 3 least significat bytes contain number of consecutive checksum,
> > > > 
> > > > typo: significant
> > > > 
> > > > (I did not scan for typos, just came across this when trying to understand
> > > > the skb->csum_level + 1 trick. Probably good to run a spell check).
> > > >
> > 
> > Oh, and about skb->csum_level + 1, maybe this way it would be more 
> > understandable: XDP_CHECKSUM_VALID_LVL0 + skb->csum_level?
> 
> Agreed, that would help document the intent.
>  
> > Using number of valid checksums (starts with 1) instead of checksum level 
> > (starts with 0) is a debatable decision, but I have decided to go with it under 
> > 2 assumptions:
> > 
> > - the only reason checksum level in skb starts with 0 is to use less bits
> > - checksum number would be more intuitive for XDP/AF_XDP application developers
> > 
> > I encourage everyone to share their opinion on that.
> 
> I assumed this offset by one was because csum_status zero implicitly
> meant XDP_CHECKSUM_NONE. Is that not correct? That should probably
> get an explicit name.
> 

Well, I was not sure, whether I should add XDP_CHECKSUM_NONE, because it would 
be equal to returning -ENODATA from kfunc, but after giving it some thought now, 
it is worth to have XDP_CHECKSUM_NONE for packets that have no checksum to 
check, like for hash there is XDP_RSS_TYPE_L2.

[xdp-hints] Re: [PATCH bpf-next v3 10/21] ice: Implement VLAN tag hint

[Simon Horman]

On Wed, Jul 19, 2023 at 08:37:23PM +0200, Larysa Zaremba wrote:

...

> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> index b11cfaedb81c..4ad6db83674e 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -639,7 +639,33 @@ static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
>  	return 0;
>  }
>  
> +/**
> + * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler
> + * @ctx: XDP buff pointer
> + * @vlan_tci: destination address for VLAN tag
> + * @vlan_proto: destination address for VLAN protocol
> + *
> + * Copy VLAN tag (if was stripped) and corresponding protocol
> + * to the destination address.
> + */
> +static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> +			       __be16 *vlan_proto)
> +{
> +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> +
> +	*vlan_proto = xdp_ext->pkt_ctx.vlan_proto;
> +	if (!*vlan_proto)
> +		return -ENODATA;
> +
> +	*vlan_tci = ice_get_vlan_tci(xdp_ext->pkt_ctx.eop_desc);
> +	if (!*vlan_tag)

Hi Larysa,

Should this be vlan_tci rather than vlan_tag?

> +		return -ENODATA;
> +
> +	return 0;
> +}
> +

...

[xdp-hints] Re: [PATCH bpf-next v3 09/21] xdp: Add VLAN tag hint

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> Implement functionality that enables drivers to expose VLAN tag
> to XDP code.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

Thank you for a super detailed kfunc kdoc!

> ---
>  Documentation/networking/xdp-rx-metadata.rst |  8 ++++-
>  include/linux/netdevice.h                    |  2 ++
>  include/net/xdp.h                            |  2 ++
>  kernel/bpf/offload.c                         |  2 ++
>  net/core/xdp.c                               | 34 ++++++++++++++++++++
>  5 files changed, 47 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> index 25ce72af81c2..ea6dd79a21d3 100644
> --- a/Documentation/networking/xdp-rx-metadata.rst
> +++ b/Documentation/networking/xdp-rx-metadata.rst
> @@ -18,7 +18,13 @@ Currently, the following kfuncs are supported. In the future, as more
>  metadata is supported, this set will grow:
>  
>  .. kernel-doc:: net/core/xdp.c
> -   :identifiers: bpf_xdp_metadata_rx_timestamp bpf_xdp_metadata_rx_hash
> +   :identifiers: bpf_xdp_metadata_rx_timestamp
> +
> +.. kernel-doc:: net/core/xdp.c
> +   :identifiers: bpf_xdp_metadata_rx_hash
> +
> +.. kernel-doc:: net/core/xdp.c
> +   :identifiers: bpf_xdp_metadata_rx_vlan_tag
>  
>  An XDP program can use these kfuncs to read the metadata into stack
>  variables for its own consumption. Or, to pass the metadata on to other
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index b828c7a75be2..1749f4f75c64 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1658,6 +1658,8 @@ struct xdp_metadata_ops {
>  	int	(*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
>  	int	(*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash,
>  			       enum xdp_rss_hash_type *rss_type);
> +	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> +				   __be16 *vlan_proto);
>  };
>  
>  /**
> diff --git a/include/net/xdp.h b/include/net/xdp.h
> index 6381560efae2..89c58f56ffc6 100644
> --- a/include/net/xdp.h
> +++ b/include/net/xdp.h
> @@ -389,6 +389,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
>  			   bpf_xdp_metadata_rx_timestamp) \
>  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
>  			   bpf_xdp_metadata_rx_hash) \
> +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> +			   bpf_xdp_metadata_rx_vlan_tag) \
>  
>  enum {
>  #define XDP_METADATA_KFUNC(name, _) name,
> diff --git a/kernel/bpf/offload.c b/kernel/bpf/offload.c
> index 8a26cd8814c1..986e7becfd42 100644
> --- a/kernel/bpf/offload.c
> +++ b/kernel/bpf/offload.c
> @@ -848,6 +848,8 @@ void *bpf_dev_bound_resolve_kfunc(struct bpf_prog *prog, u32 func_id)
>  		p = ops->xmo_rx_timestamp;
>  	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_HASH))
>  		p = ops->xmo_rx_hash;
> +	else if (func_id == bpf_xdp_metadata_kfunc_id(XDP_METADATA_KFUNC_RX_VLAN_TAG))
> +		p = ops->xmo_rx_vlan_tag;
>  out:
>  	up_read(&bpf_devs_lock);
>  
> diff --git a/net/core/xdp.c b/net/core/xdp.c
> index 8362130bf085..8b55419d332e 100644
> --- a/net/core/xdp.c
> +++ b/net/core/xdp.c
> @@ -738,6 +738,40 @@ __bpf_kfunc int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, u32 *hash,
>  	return -EOPNOTSUPP;
>  }
>  
> +/**
> + * bpf_xdp_metadata_rx_vlan_tag - Get XDP packet outermost VLAN tag
> + * @ctx: XDP context pointer.
> + * @vlan_tci: Destination pointer for VLAN TCI (VID + DEI + PCP)
> + * @vlan_proto: Destination pointer for VLAN Tag protocol identifier (TPID).
> + *
> + * In case of success, ``vlan_proto`` contains *Tag protocol identifier (TPID)*,
> + * usually ``ETH_P_8021Q`` or ``ETH_P_8021AD``, but some networks can use
> + * custom TPIDs. ``vlan_proto`` is stored in **network byte order (BE)**
> + * and should be used as follows:
> + * ``if (vlan_proto == bpf_htons(ETH_P_8021Q)) do_something();``
> + *
> + * ``vlan_tci`` contains the remaining 16 bits of a VLAN tag.
> + * Driver is expected to provide those in **host byte order (usually LE)**,
> + * so the bpf program should not perform byte conversion.
> + * According to 802.1Q standard, *VLAN TCI (Tag control information)*
> + * is a bit field that contains:
> + * *VLAN identifier (VID)* that can be read with ``vlan_tci & 0xfff``,
> + * *Drop eligible indicator (DEI)* - 1 bit,
> + * *Priority code point (PCP)* - 3 bits.
> + * For detailed meaning of DEI and PCP, please refer to other sources.
> + *
> + * Return:
> + * * Returns 0 on success or ``-errno`` on error.
> + * * ``-EOPNOTSUPP`` : device driver doesn't implement kfunc
> + * * ``-ENODATA``    : VLAN tag was not stripped or is not available
> + */
> +__bpf_kfunc int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> +					     u16 *vlan_tci,
> +					     __be16 *vlan_proto)
> +{
> +	return -EOPNOTSUPP;
> +}
> +
>  __diag_pop();
>  
>  BTF_SET8_START(xdp_metadata_kfunc_ids)
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Stanislav Fomichev]

On 07/20, Zaremba, Larysa wrote:
> On Thu, Jul 20, 2023 at 08:14:52AM -0700, Alexei Starovoitov wrote:
> > On Thu, Jul 20, 2023 at 2:47 AM Zaremba, Larysa
> > <larysa.zaremba@intel.com> wrote:
> > >
> > > On Wed, Jul 19, 2023 at 05:51:17PM -0400, Willem de Bruijn wrote:
> > > > Alexei Starovoitov wrote:
> > > > > On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > > > > > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > > > > > whether HW has validated any checksums.
> > > > > >
> > > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > > ---
> > > > > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> > > > > >  1 file changed, 29 insertions(+)
> > > > > >
> > > > > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > > index 54685d0747aa..6647a7e55ac8 100644
> > > > > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > > >   return 0;
> > > > > >  }
> > > > > >
> > > > > > +/**
> > > > > > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > > > > > + * @ctx: XDP buff pointer
> > > > > > + * @csum_status: destination address
> > > > > > + * @csum_info: destination address
> > > > > > + *
> > > > > > + * Copy HW checksum level (if was checked) to the destination address.
> > > > > > + */
> > > > > > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > > > > > +                    enum xdp_csum_status *csum_status,
> > > > > > +                    union xdp_csum_info *csum_info)
> > > > > > +{
> > > > > > + const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > > > > > + const union ice_32b_rx_flex_desc *eop_desc;
> > > > > > + enum ice_rx_csum_status status;
> > > > > > + u16 ptype;
> > > > > > +
> > > > > > + eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > > > > > + ptype = ice_get_ptype(eop_desc);
> > > > > > +
> > > > > > + status = ice_get_rx_csum_status(eop_desc, ptype);
> > > > > > + if (status & ICE_RX_CSUM_NONE)
> > > > > > +         return -ENODATA;
> > > > > > +
> > > > > > + *csum_status = ice_rx_csum_lvl(status) + 1;
> 
> I'll duplicate an improved version of this line from another thread in case it 
> could help with the comprehension during review:
> 
> *csum_status = XDP_CHECKSUM_VALID_LVL0 + ice_rx_csum_lvl(status);
> 
> > > > > > + return 0;
> > > > > > +}
> > > > >
> > > > > and xdp_csum_info from previous patch left uninitialized?
> > > > > What was the point adding it then?
> > > >
> > > > I suppose this driver only returns CHECKSUM_NONE or
> > > > CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.
> > > >
> > >
> > > Yes, correct, current ice HW cannot produce complete checksum,
> > > so only CHECKSUM_UNNECESSARY for known protocols, CHECKSUM_NONE otherwise,
> > > nothing to initialize csum_info with in either case.
> > >
> > > xdp_csum_info is initialized in veth implementation though, but only
> > > csum_start/offset, so complete XDP checksum has no users in this patchset.
> > > Is this a problem?
> > >
> > > In previous version I had CHECKSUM_UNNECESSARY-only kfunc, but I think everyone
> > > has agreed, csum hint kfunc should give more comprehensive output.
> > 
> > csum kfunc supposed to be generic.
> > If for ICE it fills in one argument and for veth another then the whole
> > idea of generic api is not working.
> 
> Both ice and veth fill in the csum_status, the need to fill in the csum_info is 
> determined by the status. I don not see a problem with that.
> 
> Maybe you have an issue with putting a valid checksum number into a status 
> instead of info? Please clarify.

+1, that seems to match skb interface

Regarding 'generic api not working' in general: I think we've discussed
that with this 'flexible' kfunc format we can allow non-generic kfuncs for
specific devices if we think that it makes sense to
differentiate/experiment/etc. Do you think it makes sense to go
non-generic route here?

[xdp-hints] Re: [PATCH bpf-next v3 14/21] selftests/bpf: Allow VLAN packets in xdp_hw_metadata

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> Make VLAN c-tag and s-tag XDP hint testing more convenient
> by not skipping VLAN-ed packets.
> 
> Allow both 802.1ad and 802.1Q headers.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>  tools/testing/selftests/bpf/progs/xdp_hw_metadata.c | 10 +++++++++-
>  tools/testing/selftests/bpf/xdp_metadata.h          |  8 ++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> index b2dfd7066c6e..63d7de6c6bbb 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> @@ -26,15 +26,23 @@ int rx(struct xdp_md *ctx)
>  {
>  	void *data, *data_meta, *data_end;
>  	struct ipv6hdr *ip6h = NULL;
> -	struct ethhdr *eth = NULL;
>  	struct udphdr *udp = NULL;
>  	struct iphdr *iph = NULL;
>  	struct xdp_meta *meta;
> +	struct ethhdr *eth;
>  	int err;
>  
>  	data = (void *)(long)ctx->data;
>  	data_end = (void *)(long)ctx->data_end;
>  	eth = data;
> +
> +	if (eth + 1 < data_end && (eth->h_proto == bpf_htons(ETH_P_8021AD) ||
> +				   eth->h_proto == bpf_htons(ETH_P_8021Q)))
> +		eth = (void *)eth + sizeof(struct vlan_hdr);
> +
> +	if (eth + 1 < data_end && eth->h_proto == bpf_htons(ETH_P_8021Q))
> +		eth = (void *)eth + sizeof(struct vlan_hdr);
> +
>  	if (eth + 1 < data_end) {
>  		if (eth->h_proto == bpf_htons(ETH_P_IP)) {
>  			iph = (void *)(eth + 1);
> diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
> index 938a729bd307..6664893c2c77 100644
> --- a/tools/testing/selftests/bpf/xdp_metadata.h
> +++ b/tools/testing/selftests/bpf/xdp_metadata.h
> @@ -9,6 +9,14 @@
>  #define ETH_P_IPV6 0x86DD
>  #endif
>  
> +#ifndef ETH_P_8021Q
> +#define ETH_P_8021Q 0x8100
> +#endif
> +
> +#ifndef ETH_P_8021AD
> +#define ETH_P_8021AD 0x88A8
> +#endif
> +
>  struct xdp_meta {
>  	__u64 rx_timestamp;
>  	__u64 xdp_timestamp;
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 16/21] selftests/bpf: Add flags and new hints to xdp_hw_metadata

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> Add hints added in the previous patches (VLAN tag and checksum)
> to the xdp_hw_metadata program.
> 
> Also, to make metadata layout more straightforward, add flags field
> to pass information about validity of every separate hint separately.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

with a small nit below

> ---
>  .../selftests/bpf/progs/xdp_hw_metadata.c     | 37 +++++++--
>  tools/testing/selftests/bpf/xdp_hw_metadata.c | 79 +++++++++++++++++--
>  tools/testing/selftests/bpf/xdp_metadata.h    | 31 +++++++-
>  3 files changed, 135 insertions(+), 12 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> index 63d7de6c6bbb..75a61317668d 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> @@ -20,6 +20,12 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
>  					 __u64 *timestamp) __ksym;
>  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
>  				    enum xdp_rss_hash_type *rss_type) __ksym;
> +extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> +					__u16 *vlan_tci,
> +					__be16 *vlan_proto) __ksym;
> +extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> +				    enum xdp_csum_status *csum_status,
> +				    union xdp_csum_info *csum_info) __ksym;
>  
>  SEC("xdp")
>  int rx(struct xdp_md *ctx)
> @@ -84,15 +90,36 @@ int rx(struct xdp_md *ctx)
>  		return XDP_PASS;
>  	}
>  
> +	meta->hint_valid = 0;
> +
>  	err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
> -	if (!err)
> +	if (err) {
> +		meta->rx_timestamp_err = err;
> +	} else {
> +		meta->hint_valid |= XDP_META_FIELD_TS;
>  		meta->xdp_timestamp = bpf_ktime_get_tai_ns();
> +	}

Maybe we can call bpf_ktime_get_tai_ns unconditionally? Then it will
match the rest formatting-wise (no {}).

meta->xdp_timestamp = bpf_ktime_get_tai_ns();

err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
if (err)
	meta->rx_timestamp_err = err;
else
	meta->hint_valid |= XDP_META_FIELD_TS;

WDYT?

> +
> +	err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash,
> +				       &meta->rx_hash_type);
> +	if (err)
> +		meta->rx_hash_err = err;
>  	else
> -		meta->rx_timestamp = 0; /* Used by AF_XDP as not avail signal */
> +		meta->hint_valid |= XDP_META_FIELD_RSS;
>  
> -	err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> -	if (err < 0)
> -		meta->rx_hash_err = err; /* Used by AF_XDP as no hash signal */
> +	err = bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci,
> +					   &meta->rx_vlan_proto);
> +	if (err)
> +		meta->rx_vlan_tag_err = err;
> +	else
> +		meta->hint_valid |= XDP_META_FIELD_VLAN_TAG;
> +
> +	err = bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
> +				       (void *)&meta->rx_csum_info);
> +	if (err)
> +		meta->rx_csum_err = err;
> +	else
> +		meta->hint_valid |= XDP_META_FIELD_CSUM;
>  
>  	__sync_add_and_fetch(&pkts_redir, 1);
>  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> index 613321eb84c1..a045de7dc910 100644
> --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> @@ -19,6 +19,9 @@
>  #include "xsk.h"
>  
>  #include <error.h>
> +#include <linux/kernel.h>
> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
>  #include <linux/errqueue.h>
>  #include <linux/if_link.h>
>  #include <linux/net_tstamp.h>
> @@ -150,21 +153,70 @@ static __u64 gettime(clockid_t clock_id)
>  	return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
>  }
>  
> +#define VLAN_PRIO_MASK		GENMASK(15, 13) /* Priority Code Point */
> +#define VLAN_DEI_MASK		GENMASK(12, 12) /* Drop Eligible Indicator */
> +#define VLAN_VID_MASK		GENMASK(11, 0)	/* VLAN Identifier */
> +static void print_vlan_tci(__u16 tag)
> +{
> +	__u16 vlan_id = FIELD_GET(VLAN_VID_MASK, tag);
> +	__u8 pcp = FIELD_GET(VLAN_PRIO_MASK, tag);
> +	bool dei = FIELD_GET(VLAN_DEI_MASK, tag);
> +
> +	printf("PCP=%u, DEI=%d, VID=0x%X\n", pcp, dei, vlan_id);
> +}
> +
> +#define XDP_CHECKSUM_VALID_NUM_MASK	GENMASK(2, 0)
> +#define XDP_CHECKSUM_PARTIAL		BIT(3)
> +#define XDP_CHECKSUM_COMPLETE		BIT(4)
> +
> +struct partial_csum_info {
> +	__u16 csum_start;
> +	__u16 csum_offset;
> +};
> +
> +static void print_csum_state(__u32 status, __u32 info)
> +{
> +	u8 csum_num = status & XDP_CHECKSUM_VALID_NUM_MASK;
> +
> +	printf("Checksum status: ");
> +	if (status != XDP_CHECKSUM_PARTIAL &&
> +	    status & ~(XDP_CHECKSUM_COMPLETE | XDP_CHECKSUM_VALID_NUM_MASK))
> +		printf("cannot be interpreted, status=0x%X\n", status);
> +
> +	if (status == XDP_CHECKSUM_PARTIAL) {
> +		struct partial_csum_info *partial_info = (void *)&info;
> +
> +		printf("partial, csum_start=%u, csum_offset=%u\n",
> +		       partial_info->csum_start, partial_info->csum_offset);
> +		return;
> +	}
> +
> +	if (status & XDP_CHECKSUM_COMPLETE)
> +		printf("complete, checksum=0x%X%s", info,
> +		       csum_num ? ", " : "\n");
> +
> +	if (csum_num > 1)
> +		printf("%u consecutive checksums are verified\n", csum_num);
> +	else if (csum_num)
> +		printf("outermost checksum is verified\n");
> +}
> +
>  static void verify_xdp_metadata(void *data, clockid_t clock_id)
>  {
>  	struct xdp_meta *meta;
>  
>  	meta = data - sizeof(*meta);
>  
> -	if (meta->rx_hash_err < 0)
> -		printf("No rx_hash err=%d\n", meta->rx_hash_err);
> -	else
> +	if (meta->hint_valid & XDP_META_FIELD_RSS)
>  		printf("rx_hash: 0x%X with RSS type:0x%X\n",
>  		       meta->rx_hash, meta->rx_hash_type);
> +	else
> +		printf("No rx_hash, err=%d\n", meta->rx_hash_err);
> +
> +	if (meta->hint_valid & XDP_META_FIELD_TS) {
> +		printf("rx_timestamp:  %llu (sec:%0.4f)\n", meta->rx_timestamp,
> +		       (double)meta->rx_timestamp / NANOSEC_PER_SEC);
>  
> -	printf("rx_timestamp:  %llu (sec:%0.4f)\n", meta->rx_timestamp,
> -	       (double)meta->rx_timestamp / NANOSEC_PER_SEC);
> -	if (meta->rx_timestamp) {
>  		__u64 usr_clock = gettime(clock_id);
>  		__u64 xdp_clock = meta->xdp_timestamp;
>  		__s64 delta_X = xdp_clock - meta->rx_timestamp;
> @@ -179,8 +231,23 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id)
>  		       usr_clock, (double)usr_clock / NANOSEC_PER_SEC,
>  		       (double)delta_X2U / NANOSEC_PER_SEC,
>  		       (double)delta_X2U / 1000);
> +	} else {
> +		printf("No rx_timestamp, err=%d\n", meta->rx_timestamp_err);
>  	}
>  
> +	if (meta->hint_valid & XDP_META_FIELD_VLAN_TAG) {
> +		printf("rx_vlan_proto: 0x%X\n", ntohs(meta->rx_vlan_proto));
> +		printf("rx_vlan_tci: ");
> +		print_vlan_tci(meta->rx_vlan_tci);
> +	} else {
> +		printf("No rx_vlan_tci or rx_vlan_proto, err=%d\n",
> +		       meta->rx_vlan_tag_err);
> +	}
> +
> +	if (meta->hint_valid & XDP_META_FIELD_CSUM)
> +		print_csum_state(meta->rx_csum_status, meta->rx_csum_info);
> +	else
> +		printf("Checksum was not checked, err=%d\n", meta->rx_csum_err);
>  }
>  
>  static void verify_skb_metadata(int fd)
> diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
> index 6664893c2c77..95e7b53d6bfb 100644
> --- a/tools/testing/selftests/bpf/xdp_metadata.h
> +++ b/tools/testing/selftests/bpf/xdp_metadata.h
> @@ -17,12 +17,41 @@
>  #define ETH_P_8021AD 0x88A8
>  #endif
>  
> +#ifndef BIT
> +#define BIT(nr)			(1 << (nr))
> +#endif
> +
> +enum xdp_meta_field {
> +	XDP_META_FIELD_TS	= BIT(0),
> +	XDP_META_FIELD_RSS	= BIT(1),
> +	XDP_META_FIELD_VLAN_TAG	= BIT(2),
> +	XDP_META_FIELD_CSUM	= BIT(3),
> +};
> +
>  struct xdp_meta {
> -	__u64 rx_timestamp;
> +	union {
> +		__u64 rx_timestamp;
> +		__s32 rx_timestamp_err;
> +	};
>  	__u64 xdp_timestamp;
>  	__u32 rx_hash;
>  	union {
>  		__u32 rx_hash_type;
>  		__s32 rx_hash_err;
>  	};
> +	union {
> +		struct {
> +			__u16 rx_vlan_tci;
> +			__be16 rx_vlan_proto;
> +		};
> +		__s32 rx_vlan_tag_err;
> +	};
> +	union {
> +		struct {
> +			__u32 rx_csum_status;
> +			__u32 rx_csum_info;
> +		};
> +		__s32 rx_csum_err;
> +	};
> +	enum xdp_meta_field hint_valid;
>  };
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 17/21] veth: Implement VLAN tag and checksum XDP hint

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> In order to test VLAN tag and checksum XDP hints in hardware-independent
> selfttests, implement newly added XDP hints in veth driver.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>  drivers/net/veth.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index 614f3e3efab0..86239549120d 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -1732,6 +1732,50 @@ static int veth_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
>  	return 0;
>  }
>  
> +static int veth_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> +				__be16 *vlan_proto)
> +{
> +	struct veth_xdp_buff *_ctx = (void *)ctx;
> +	struct sk_buff *skb = _ctx->skb;
> +	int err;
> +
> +	if (!skb)
> +		return -ENODATA;
> +
> +	err = __vlan_hwaccel_get_tag(skb, vlan_tci);
> +	if (err)
> +		return err;
> +
> +	*vlan_proto = skb->vlan_proto;
> +	return err;
> +}
> +
> +static int veth_xdp_rx_csum(const struct xdp_md *ctx,
> +			    enum xdp_csum_status *csum_status,
> +			    union xdp_csum_info *csum_info)
> +{
> +	struct veth_xdp_buff *_ctx = (void *)ctx;
> +	struct sk_buff *skb = _ctx->skb;
> +
> +	if (!skb)
> +		return -ENODATA;
> +
> +	if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
> +		*csum_status = skb->csum_level + 1;
> +	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
> +		*csum_status = XDP_CHECKSUM_PARTIAL;
> +		csum_info->csum_start = skb_checksum_start_offset(skb);
> +		csum_info->csum_offset = skb->csum_offset;
> +	} else if (skb->ip_summed == CHECKSUM_COMPLETE) {
> +		*csum_status = XDP_CHECKSUM_COMPLETE;
> +		csum_info->checksum = skb->csum;
> +	} else {
> +		return -ENODATA;
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct net_device_ops veth_netdev_ops = {
>  	.ndo_init            = veth_dev_init,
>  	.ndo_open            = veth_open,
> @@ -1756,6 +1800,8 @@ static const struct net_device_ops veth_netdev_ops = {
>  static const struct xdp_metadata_ops veth_xdp_metadata_ops = {
>  	.xmo_rx_timestamp		= veth_xdp_rx_timestamp,
>  	.xmo_rx_hash			= veth_xdp_rx_hash,
> +	.xmo_rx_vlan_tag		= veth_xdp_rx_vlan_tag,
> +	.xmo_rx_csum			= veth_xdp_rx_csum,
>  };
>  
>  #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 18/21] net: make vlan_get_tag() return -ENODATA instead of -EINVAL

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> __vlan_hwaccel_get_tag() is used in veth XDP hints implementation,
> its return value (-EINVAL if skb is not VLAN tagged) is passed to bpf code,
> but XDP hints specification requires drivers to return -ENODATA, if a hint
> cannot be provided for a particular packet.
> 
> Solve this inconsistency by changing error return value of
> __vlan_hwaccel_get_tag() from -EINVAL to -ENODATA, do the same thing to
> __vlan_get_tag(), because this function is supposed to follow the same
> convention. This, in turn, makes -ENODATA the only non-zero value
> vlan_get_tag() can return. We can do this with no side effects, because
> none of the users of the 3 above-mentioned functions rely on the exact
> value.
> 
> Suggested-by: Jesper Dangaard Brouer <jbrouer@redhat.com>
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>  include/linux/if_vlan.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
> index 6ba71957851e..fb35d7dd77a2 100644
> --- a/include/linux/if_vlan.h
> +++ b/include/linux/if_vlan.h
> @@ -540,7 +540,7 @@ static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
>  	struct vlan_ethhdr *veth = skb_vlan_eth_hdr(skb);
>  
>  	if (!eth_type_vlan(veth->h_vlan_proto))
> -		return -EINVAL;
> +		return -ENODATA;
>  
>  	*vlan_tci = ntohs(veth->h_vlan_TCI);
>  	return 0;
> @@ -561,7 +561,7 @@ static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
>  		return 0;
>  	} else {
>  		*vlan_tci = 0;
> -		return -EINVAL;
> +		return -ENODATA;
>  	}
>  }
>  
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 19/21] selftests/bpf: Use AF_INET for TX in xdp_metadata

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> The easiest way to simulate stripped VLAN tag in veth is to send a packet
> from VLAN interface, attached to veth. Unfortunately, this approach is
> incompatible with AF_XDP on TX side, because VLAN interfaces do not have
> such feature.
> 
> Replace AF_XDP packet generation with sending the same datagram via
> AF_INET socket.
> 
> This does not change the packet contents or hints values with one notable
> exception: rx_hash_type, which previously was expected to be 0, now is
> expected be at least XDP_RSS_TYPE_L4.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>  .../selftests/bpf/prog_tests/xdp_metadata.c   | 167 +++++++-----------
>  1 file changed, 59 insertions(+), 108 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> index 626c461fa34d..1877e5c6d6c7 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> @@ -20,7 +20,7 @@
>  
>  #define UDP_PAYLOAD_BYTES 4
>  
> -#define AF_XDP_SOURCE_PORT 1234
> +#define UDP_SOURCE_PORT 1234
>  #define AF_XDP_CONSUMER_PORT 8080
>  
>  #define UMEM_NUM 16
> @@ -33,6 +33,12 @@
>  #define RX_ADDR "10.0.0.2"
>  #define PREFIX_LEN "8"
>  #define FAMILY AF_INET
> +#define TX_NETNS_NAME "xdp_metadata_tx"
> +#define RX_NETNS_NAME "xdp_metadata_rx"
> +#define TX_MAC "00:00:00:00:00:01"
> +#define RX_MAC "00:00:00:00:00:02"
> +
> +#define XDP_RSS_TYPE_L4 BIT(3)
>  
>  struct xsk {
>  	void *umem_area;
> @@ -119,90 +125,28 @@ static void close_xsk(struct xsk *xsk)
>  	munmap(xsk->umem_area, UMEM_SIZE);
>  }
>  
> -static void ip_csum(struct iphdr *iph)
> +static int generate_packet_udp(void)
>  {
> -	__u32 sum = 0;
> -	__u16 *p;
> -	int i;
> -
> -	iph->check = 0;
> -	p = (void *)iph;
> -	for (i = 0; i < sizeof(*iph) / sizeof(*p); i++)
> -		sum += p[i];
> -
> -	while (sum >> 16)
> -		sum = (sum & 0xffff) + (sum >> 16);
> -
> -	iph->check = ~sum;
> -}
> -
> -static int generate_packet(struct xsk *xsk, __u16 dst_port)
> -{
> -	struct xdp_desc *tx_desc;
> -	struct udphdr *udph;
> -	struct ethhdr *eth;
> -	struct iphdr *iph;
> -	void *data;
> -	__u32 idx;
> -	int ret;
> -
> -	ret = xsk_ring_prod__reserve(&xsk->tx, 1, &idx);
> -	if (!ASSERT_EQ(ret, 1, "xsk_ring_prod__reserve"))
> -		return -1;
> -
> -	tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, idx);
> -	tx_desc->addr = idx % (UMEM_NUM / 2) * UMEM_FRAME_SIZE;
> -	printf("%p: tx_desc[%u]->addr=%llx\n", xsk, idx, tx_desc->addr);
> -	data = xsk_umem__get_data(xsk->umem_area, tx_desc->addr);
> -
> -	eth = data;
> -	iph = (void *)(eth + 1);
> -	udph = (void *)(iph + 1);
> -
> -	memcpy(eth->h_dest, "\x00\x00\x00\x00\x00\x02", ETH_ALEN);
> -	memcpy(eth->h_source, "\x00\x00\x00\x00\x00\x01", ETH_ALEN);
> -	eth->h_proto = htons(ETH_P_IP);
> -
> -	iph->version = 0x4;
> -	iph->ihl = 0x5;
> -	iph->tos = 0x9;
> -	iph->tot_len = htons(sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES);
> -	iph->id = 0;
> -	iph->frag_off = 0;
> -	iph->ttl = 0;
> -	iph->protocol = IPPROTO_UDP;
> -	ASSERT_EQ(inet_pton(FAMILY, TX_ADDR, &iph->saddr), 1, "inet_pton(TX_ADDR)");
> -	ASSERT_EQ(inet_pton(FAMILY, RX_ADDR, &iph->daddr), 1, "inet_pton(RX_ADDR)");
> -	ip_csum(iph);
> -
> -	udph->source = htons(AF_XDP_SOURCE_PORT);
> -	udph->dest = htons(dst_port);
> -	udph->len = htons(sizeof(*udph) + UDP_PAYLOAD_BYTES);
> -	udph->check = 0;
> -
> -	memset(udph + 1, 0xAA, UDP_PAYLOAD_BYTES);
> -
> -	tx_desc->len = sizeof(*eth) + sizeof(*iph) + sizeof(*udph) + UDP_PAYLOAD_BYTES;
> -	xsk_ring_prod__submit(&xsk->tx, 1);
> -
> -	ret = sendto(xsk_socket__fd(xsk->socket), NULL, 0, MSG_DONTWAIT, NULL, 0);
> -	if (!ASSERT_GE(ret, 0, "sendto"))
> -		return ret;
> -
> -	return 0;
> -}
> -
> -static void complete_tx(struct xsk *xsk)
> -{
> -	__u32 idx;
> -	__u64 addr;
> -
> -	if (ASSERT_EQ(xsk_ring_cons__peek(&xsk->comp, 1, &idx), 1, "xsk_ring_cons__peek")) {
> -		addr = *xsk_ring_cons__comp_addr(&xsk->comp, idx);
> -
> -		printf("%p: complete tx idx=%u addr=%llx\n", xsk, idx, addr);
> -		xsk_ring_cons__release(&xsk->comp, 1);
> -	}
> +	char udp_payload[UDP_PAYLOAD_BYTES];
> +	struct sockaddr_in rx_addr;
> +	int sock_fd, err = 0;
> +
> +	/* Build a packet */
> +	memset(udp_payload, 0xAA, UDP_PAYLOAD_BYTES);
> +	rx_addr.sin_addr.s_addr = inet_addr(RX_ADDR);
> +	rx_addr.sin_family = AF_INET;
> +	rx_addr.sin_port = htons(UDP_SOURCE_PORT);
> +
> +	sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
> +	if (!ASSERT_GE(sock_fd, 0, "socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)"))
> +		return sock_fd;
> +
> +	err = sendto(sock_fd, udp_payload, UDP_PAYLOAD_BYTES, MSG_DONTWAIT,
> +		     (void *)&rx_addr, sizeof(rx_addr));
> +	ASSERT_GE(err, 0, "sendto");
> +
> +	close(sock_fd);
> +	return err;
>  }
>  
>  static void refill_rx(struct xsk *xsk, __u64 addr)
> @@ -268,7 +212,8 @@ static int verify_xsk_metadata(struct xsk *xsk)
>  	if (!ASSERT_NEQ(meta->rx_hash, 0, "rx_hash"))
>  		return -1;
>  
> -	ASSERT_EQ(meta->rx_hash_type, 0, "rx_hash_type");
> +	if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
> +		return -1;
>  
>  	xsk_ring_cons__release(&xsk->rx, 1);
>  	refill_rx(xsk, comp_addr);
> @@ -284,36 +229,38 @@ void test_xdp_metadata(void)
>  	struct nstoken *tok = NULL;
>  	__u32 queue_id = QUEUE_ID;
>  	struct bpf_map *prog_arr;
> -	struct xsk tx_xsk = {};
>  	struct xsk rx_xsk = {};
>  	__u32 val, key = 0;
>  	int retries = 10;
>  	int rx_ifindex;
> -	int tx_ifindex;
>  	int sock_fd;
>  	int ret;
>  
> -	/* Setup new networking namespace, with a veth pair. */
> +	/* Setup new networking namespaces, with a veth pair. */
>  
> -	SYS(out, "ip netns add xdp_metadata");
> -	tok = open_netns("xdp_metadata");
> +	SYS(out, "ip netns add " TX_NETNS_NAME);
> +	SYS(out, "ip netns add " RX_NETNS_NAME);
> +
> +	tok = open_netns(TX_NETNS_NAME);
>  	SYS(out, "ip link add numtxqueues 1 numrxqueues 1 " TX_NAME
>  	    " type veth peer " RX_NAME " numtxqueues 1 numrxqueues 1");
> -	SYS(out, "ip link set dev " TX_NAME " address 00:00:00:00:00:01");
> -	SYS(out, "ip link set dev " RX_NAME " address 00:00:00:00:00:02");
> +	SYS(out, "ip link set " RX_NAME " netns " RX_NETNS_NAME);
> +
> +	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
>  	SYS(out, "ip link set dev " TX_NAME " up");
> -	SYS(out, "ip link set dev " RX_NAME " up");
>  	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
> -	SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
>  
> -	rx_ifindex = if_nametoindex(RX_NAME);
> -	tx_ifindex = if_nametoindex(TX_NAME);
> +	/* Avoid ARP calls */
> +	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
> +	close_netns(tok);
>  
> -	/* Setup separate AF_XDP for TX and RX interfaces. */
> +	tok = open_netns(RX_NETNS_NAME);
> +	SYS(out, "ip link set dev " RX_NAME " address " RX_MAC);
> +	SYS(out, "ip link set dev " RX_NAME " up");
> +	SYS(out, "ip addr add " RX_ADDR "/" PREFIX_LEN " dev " RX_NAME);
> +	rx_ifindex = if_nametoindex(RX_NAME);
>  
> -	ret = open_xsk(tx_ifindex, &tx_xsk);
> -	if (!ASSERT_OK(ret, "open_xsk(TX_NAME)"))
> -		goto out;
> +	/* Setup AF_XDP for RX interface. */
>  
>  	ret = open_xsk(rx_ifindex, &rx_xsk);
>  	if (!ASSERT_OK(ret, "open_xsk(RX_NAME)"))
> @@ -353,19 +300,20 @@ void test_xdp_metadata(void)
>  	ret = bpf_map_update_elem(bpf_map__fd(bpf_obj->maps.xsk), &queue_id, &sock_fd, 0);
>  	if (!ASSERT_GE(ret, 0, "bpf_map_update_elem"))
>  		goto out;
> +	close_netns(tok);
>  
>  	/* Send packet destined to RX AF_XDP socket. */
> -	if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
> -		       "generate AF_XDP_CONSUMER_PORT"))
> +	tok = open_netns(TX_NETNS_NAME);
> +	if (!ASSERT_GE(generate_packet_udp(), 0, "generate UDP packet"))
>  		goto out;
> +	close_netns(tok);
>  
>  	/* Verify AF_XDP RX packet has proper metadata. */
> +	tok = open_netns(RX_NETNS_NAME);
>  	if (!ASSERT_GE(verify_xsk_metadata(&rx_xsk), 0,
>  		       "verify_xsk_metadata"))
>  		goto out;
>  
> -	complete_tx(&tx_xsk);
> -
>  	/* Make sure freplace correctly picks up original bound device
>  	 * and doesn't crash.
>  	 */
> @@ -382,12 +330,15 @@ void test_xdp_metadata(void)
>  
>  	if (!ASSERT_OK(xdp_metadata2__attach(bpf_obj2), "attach freplace"))
>  		goto out;
> +	close_netns(tok);
>  
>  	/* Send packet to trigger . */
> -	if (!ASSERT_GE(generate_packet(&tx_xsk, AF_XDP_CONSUMER_PORT), 0,
> -		       "generate freplace packet"))
> +	tok = open_netns(TX_NETNS_NAME);
> +	if (!ASSERT_GE(generate_packet_udp(), 0, "generate freplace packet"))
>  		goto out;
> +	close_netns(tok);
>  
> +	tok = open_netns(RX_NETNS_NAME);
>  	while (!retries--) {
>  		if (bpf_obj2->bss->called)
>  			break;
> @@ -397,10 +348,10 @@ void test_xdp_metadata(void)
>  
>  out:
>  	close_xsk(&rx_xsk);
> -	close_xsk(&tx_xsk);
>  	xdp_metadata2__destroy(bpf_obj2);
>  	xdp_metadata__destroy(bpf_obj);
>  	if (tok)
>  		close_netns(tok);
> -	SYS_NOFAIL("ip netns del xdp_metadata");
> +	SYS_NOFAIL("ip netns del " RX_NETNS_NAME);
> +	SYS_NOFAIL("ip netns del " TX_NETNS_NAME);
>  }
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto in xdp_metadata

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> Verify, whether VLAN tag and proto are set correctly.
> 
> To simulate "stripped" VLAN tag on veth, send test packet from VLAN
> interface.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>  .../selftests/bpf/prog_tests/xdp_metadata.c   | 22 +++++++++++++++++--
>  .../selftests/bpf/progs/xdp_metadata.c        |  4 ++++
>  2 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> index 1877e5c6d6c7..6665cf0c59cc 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> @@ -38,7 +38,15 @@
>  #define TX_MAC "00:00:00:00:00:01"
>  #define RX_MAC "00:00:00:00:00:02"
>  
> +#define VLAN_ID 59
> +#define VLAN_ID_STR "59"

I was looking whether we have some str(x) macro in the selftests,
but doesn't look like we have any...

> +#define VLAN_PROTO "802.1Q"
> +#define VLAN_PID htons(ETH_P_8021Q)
> +#define TX_NAME_VLAN TX_NAME "." VLAN_ID_STR
> +#define RX_NAME_VLAN RX_NAME "." VLAN_ID_STR
> +
>  #define XDP_RSS_TYPE_L4 BIT(3)
> +#define VLAN_VID_MASK 0xfff
>  
>  struct xsk {
>  	void *umem_area;
> @@ -215,6 +223,12 @@ static int verify_xsk_metadata(struct xsk *xsk)
>  	if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
>  		return -1;
>  
> +	if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
> +		return -1;
> +
> +	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
> +		return -1;
> +
>  	xsk_ring_cons__release(&xsk->rx, 1);
>  	refill_rx(xsk, comp_addr);
>  
> @@ -248,10 +262,14 @@ void test_xdp_metadata(void)
>  
>  	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
>  	SYS(out, "ip link set dev " TX_NAME " up");
> -	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
> +
> +	SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
> +		 " type vlan proto " VLAN_PROTO " id " VLAN_ID_STR);
> +	SYS(out, "ip link set dev " TX_NAME_VLAN " up");
> +	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
>  
>  	/* Avoid ARP calls */
> -	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
> +	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
>  	close_netns(tok);
>  
>  	tok = open_netns(RX_NETNS_NAME);
> diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> index d151d406a123..d3111649170e 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> @@ -23,6 +23,9 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
>  					 __u64 *timestamp) __ksym;
>  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
>  				    enum xdp_rss_hash_type *rss_type) __ksym;
> +extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> +					__u16 *vlan_tci,
> +					__be16 *vlan_proto) __ksym;
>  
>  SEC("xdp")
>  int rx(struct xdp_md *ctx)
> @@ -57,6 +60,7 @@ int rx(struct xdp_md *ctx)
>  		meta->rx_timestamp = 1;
>  
>  	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> +	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
>  
>  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
>  }
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 21/21] selftests/bpf: check checksum state in xdp_metadata

[Stanislav Fomichev]

On 07/19, Larysa Zaremba wrote:
> Verify, whether kfunc in xdp_metadata test correctly returns partial
> checksum status and offsets.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Acked-by: Stanislav Fomichev <sdf@google.com>

> ---
>  .../selftests/bpf/prog_tests/xdp_metadata.c   | 30 +++++++++++++++++++
>  .../selftests/bpf/progs/xdp_metadata.c        |  6 ++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> index 6665cf0c59cc..c0ce66703696 100644
> --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> @@ -47,6 +47,7 @@
>  
>  #define XDP_RSS_TYPE_L4 BIT(3)
>  #define VLAN_VID_MASK 0xfff
> +#define XDP_CHECKSUM_PARTIAL BIT(3)
>  
>  struct xsk {
>  	void *umem_area;
> @@ -168,6 +169,32 @@ static void refill_rx(struct xsk *xsk, __u64 addr)
>  	}
>  }
>  
> +struct partial_csum_info {
> +	__u16 csum_start;
> +	__u16 csum_offset;
> +};
> +
> +static bool assert_checksum_ok(struct xdp_meta *meta)
> +{
> +	struct partial_csum_info *info;
> +	u32 csum_start, csum_offset;
> +
> +	if (!ASSERT_EQ(meta->rx_csum_status, XDP_CHECKSUM_PARTIAL,
> +		       "rx_csum_status"))
> +		return false;
> +
> +	csum_start = sizeof(struct ethhdr) + sizeof(struct iphdr);
> +	csum_offset = offsetof(struct udphdr, check);
> +	info = (void *)&meta->rx_csum_info;
> +
> +	if (!ASSERT_EQ(info->csum_start, csum_start, "rx csum_start"))
> +		return false;
> +	if (!ASSERT_EQ(info->csum_offset, csum_offset, "rx csum_offset"))
> +		return false;
> +
> +	return true;
> +}
> +
>  static int verify_xsk_metadata(struct xsk *xsk)
>  {
>  	const struct xdp_desc *rx_desc;
> @@ -229,6 +256,9 @@ static int verify_xsk_metadata(struct xsk *xsk)
>  	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
>  		return -1;
>  
> +	if (!assert_checksum_ok(meta))
> +		return -1;
> +
>  	xsk_ring_cons__release(&xsk->rx, 1);
>  	refill_rx(xsk, comp_addr);
>  
> diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> index d3111649170e..e79667a0726e 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> @@ -26,6 +26,9 @@ extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
>  extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
>  					__u16 *vlan_tci,
>  					__be16 *vlan_proto) __ksym;
> +extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> +				    enum xdp_csum_status *csum_status,
> +				    union xdp_csum_info *csum_info) __ksym;
>  
>  SEC("xdp")
>  int rx(struct xdp_md *ctx)
> @@ -62,6 +65,9 @@ int rx(struct xdp_md *ctx)
>  	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
>  	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
>  
> +	bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
> +				 (void *)&meta->rx_csum_info);
> +
>  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
>  }
>  
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v3 13/21] ice: Implement checksum hint

[Willem de Bruijn]

Stanislav Fomichev wrote:
> On 07/20, Zaremba, Larysa wrote:
> > On Thu, Jul 20, 2023 at 08:14:52AM -0700, Alexei Starovoitov wrote:
> > > On Thu, Jul 20, 2023 at 2:47 AM Zaremba, Larysa
> > > <larysa.zaremba@intel.com> wrote:
> > > >
> > > > On Wed, Jul 19, 2023 at 05:51:17PM -0400, Willem de Bruijn wrote:
> > > > > Alexei Starovoitov wrote:
> > > > > > On Wed, Jul 19, 2023 at 08:37:26PM +0200, Larysa Zaremba wrote:
> > > > > > > Implement .xmo_rx_csum callback to allow XDP code to determine,
> > > > > > > whether HW has validated any checksums.
> > > > > > >
> > > > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > > > ---
> > > > > > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 29 +++++++++++++++++++
> > > > > > >  1 file changed, 29 insertions(+)
> > > > > > >
> > > > > > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > > > index 54685d0747aa..6647a7e55ac8 100644
> > > > > > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > > > > > @@ -660,8 +660,37 @@ static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > > > >   return 0;
> > > > > > >  }
> > > > > > >
> > > > > > > +/**
> > > > > > > + * ice_xdp_rx_csum_lvl - Get level, at which HW has checked the checksum
> > > > > > > + * @ctx: XDP buff pointer
> > > > > > > + * @csum_status: destination address
> > > > > > > + * @csum_info: destination address
> > > > > > > + *
> > > > > > > + * Copy HW checksum level (if was checked) to the destination address.
> > > > > > > + */
> > > > > > > +static int ice_xdp_rx_csum(const struct xdp_md *ctx,
> > > > > > > +                    enum xdp_csum_status *csum_status,
> > > > > > > +                    union xdp_csum_info *csum_info)
> > > > > > > +{
> > > > > > > + const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > > > > > > + const union ice_32b_rx_flex_desc *eop_desc;
> > > > > > > + enum ice_rx_csum_status status;
> > > > > > > + u16 ptype;
> > > > > > > +
> > > > > > > + eop_desc = xdp_ext->pkt_ctx.eop_desc;
> > > > > > > + ptype = ice_get_ptype(eop_desc);
> > > > > > > +
> > > > > > > + status = ice_get_rx_csum_status(eop_desc, ptype);
> > > > > > > + if (status & ICE_RX_CSUM_NONE)
> > > > > > > +         return -ENODATA;
> > > > > > > +
> > > > > > > + *csum_status = ice_rx_csum_lvl(status) + 1;
> > 
> > I'll duplicate an improved version of this line from another thread in case it 
> > could help with the comprehension during review:
> > 
> > *csum_status = XDP_CHECKSUM_VALID_LVL0 + ice_rx_csum_lvl(status);
> > 
> > > > > > > + return 0;
> > > > > > > +}
> > > > > >
> > > > > > and xdp_csum_info from previous patch left uninitialized?
> > > > > > What was the point adding it then?
> > > > >
> > > > > I suppose this driver only returns CHECKSUM_NONE or
> > > > > CHECKSUM_UNNECESSARY? Also based on a grep of the driver dir.
> > > > >
> > > >
> > > > Yes, correct, current ice HW cannot produce complete checksum,
> > > > so only CHECKSUM_UNNECESSARY for known protocols, CHECKSUM_NONE otherwise,
> > > > nothing to initialize csum_info with in either case.
> > > >
> > > > xdp_csum_info is initialized in veth implementation though, but only
> > > > csum_start/offset, so complete XDP checksum has no users in this patchset.
> > > > Is this a problem?
> > > >
> > > > In previous version I had CHECKSUM_UNNECESSARY-only kfunc, but I think everyone
> > > > has agreed, csum hint kfunc should give more comprehensive output.
> > > 
> > > csum kfunc supposed to be generic.
> > > If for ICE it fills in one argument and for veth another then the whole
> > > idea of generic api is not working.
> > 
> > Both ice and veth fill in the csum_status, the need to fill in the csum_info is 
> > determined by the status. I don not see a problem with that.
> > 
> > Maybe you have an issue with putting a valid checksum number into a status 
> > instead of info? Please clarify.
> 
> +1, that seems to match skb interface
> 
> Regarding 'generic api not working' in general: I think we've discussed
> that with this 'flexible' kfunc format we can allow non-generic kfuncs for
> specific devices if we think that it makes sense to
> differentiate/experiment/etc. Do you think it makes sense to go
> non-generic route here?

I think we should expose the standard CHECKSUM_* behavior.

The current encoding captures all four types. Which type is returned
is not necessarily defined only by the device. Some devices can
return CHECKSUM_NONE for some packets, CHECKSUM_PARTIAL for others
and CHECKSUM_UNNECESSARY for a third set (e.g., mlx4). Specializing
the return type to the device would not simplify the struct.

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Willem de Bruijn]

Zaremba, Larysa wrote:
> On Thu, Jul 20, 2023 at 09:55:16AM -0400, Willem de Bruijn wrote:
> > Zaremba, Larysa wrote:
> > > On Thu, Jul 20, 2023 at 09:57:05AM +0000, Zaremba, Larysa wrote:
> > > > On Wed, Jul 19, 2023 at 05:42:04PM -0400, Willem de Bruijn wrote:
> > > > > Larysa Zaremba wrote:
> > > > > > Implement functionality that enables drivers to expose to XDP code checksum
> > > > > > information that consists of:
> > > > > > 
> > > > > > - Checksum status - bitfield that consists of
> > > > > >   - number of consecutive validated checksums. This is almost the same as
> > > > > >     csum_level in skb, but starts with 1. Enum names for those bits still
> > > > > >     use checksum level concept, so it is less confusing for driver
> > > > > >     developers.
> > > > > >   - Is checksum partial? This bit cannot coexist with any other
> > > > > >   - Is there a complete checksum available?
> > > > > > - Additional checksum data, a union of:
> > > > > >   - checksum start and offset, if checksum is partial
> > > > > >   - complete checksum, if available
> > > > > > 
> > > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > > ---
> > > > > >  Documentation/networking/xdp-rx-metadata.rst |  3 ++
> > > > > >  include/linux/netdevice.h                    |  3 ++
> > > > > >  include/net/xdp.h                            | 46 ++++++++++++++++++++
> > > > > >  kernel/bpf/offload.c                         |  2 +
> > > > > >  net/core/xdp.c                               | 23 ++++++++++
> > > > > >  5 files changed, 77 insertions(+)
> > > > > > 
> > > > > > diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> > > > > > index ea6dd79a21d3..7f056a44f682 100644
> > > > > > --- a/Documentation/networking/xdp-rx-metadata.rst
> > > > > > +++ b/Documentation/networking/xdp-rx-metadata.rst
> > > > > > @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
> > > > > >  .. kernel-doc:: net/core/xdp.c
> > > > > >     :identifiers: bpf_xdp_metadata_rx_vlan_tag
> > > > > >  
> > > > > > +.. kernel-doc:: net/core/xdp.c
> > > > > > +   :identifiers: bpf_xdp_metadata_rx_csum
> > > > > > +
> > > > > >  An XDP program can use these kfuncs to read the metadata into stack
> > > > > >  variables for its own consumption. Or, to pass the metadata on to other
> > > > > >  consumers, an XDP program can store it into the metadata area carried
> > > > > > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > > > > index 1749f4f75c64..4f6da36ac123 100644
> > > > > > --- a/include/linux/netdevice.h
> > > > > > +++ b/include/linux/netdevice.h
> > > > > > @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
> > > > > >  			       enum xdp_rss_hash_type *rss_type);
> > > > > >  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > > >  				   __be16 *vlan_proto);
> > > > > > +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> > > > > > +			       enum xdp_csum_status *csum_status,
> > > > > > +			       union xdp_csum_info *csum_info);
> > > > > >  };
> > > > > >  
> > > > > >  /**
> > > > > > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > > > > > index 89c58f56ffc6..2b7a7d678ff4 100644
> > > > > > --- a/include/net/xdp.h
> > > > > > +++ b/include/net/xdp.h
> > > > > > @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
> > > > > >  			   bpf_xdp_metadata_rx_hash) \
> > > > > >  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> > > > > >  			   bpf_xdp_metadata_rx_vlan_tag) \
> > > > > > +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> > > > > > +			   bpf_xdp_metadata_rx_csum) \
> > > > > >  
> > > > > >  enum {
> > > > > >  #define XDP_METADATA_KFUNC(name, _) name,
> > > > > > @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
> > > > > >  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
> > > > > >  };
> > > > > >  
> > > > > > +union xdp_csum_info {
> > > > > > +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> > > > > > +	 * valid, but was never calculated, TX device has to do this,
> > > > > > +	 * starting from csum_start packet byte.
> > > > > > +	 * Any preceding checksums are also considered valid.
> > > > > > +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> > > > > > +	 */
> > > > > > +	struct {
> > > > > > +		u16 csum_start;
> > > > > > +		u16 csum_offset;
> > > > > > +	};
> > > > > > +
> > > > > > +	/* Checksum, calculated over the whole packet.
> > > > > > +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> > > > > > +	 */
> > > > > > +	u32 checksum;
> > > > > > +};
> > > > > > +
> > > > > > +enum xdp_csum_status {
> > > > > > +	/* HW had parsed several transport headers and validated their
> > > > > > +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> > > > > > +	 * 3 least significat bytes contain number of consecutive checksum,
> > > > > 
> > > > > typo: significant
> > > > > 
> > > > > (I did not scan for typos, just came across this when trying to understand
> > > > > the skb->csum_level + 1 trick. Probably good to run a spell check).
> > > > >
> > > 
> > > Oh, and about skb->csum_level + 1, maybe this way it would be more 
> > > understandable: XDP_CHECKSUM_VALID_LVL0 + skb->csum_level?
> > 
> > Agreed, that would help document the intent.
> >  
> > > Using number of valid checksums (starts with 1) instead of checksum level 
> > > (starts with 0) is a debatable decision, but I have decided to go with it under 
> > > 2 assumptions:
> > > 
> > > - the only reason checksum level in skb starts with 0 is to use less bits
> > > - checksum number would be more intuitive for XDP/AF_XDP application developers
> > > 
> > > I encourage everyone to share their opinion on that.
> > 
> > I assumed this offset by one was because csum_status zero implicitly
> > meant XDP_CHECKSUM_NONE. Is that not correct? That should probably
> > get an explicit name.
> > 
> 
> Well, I was not sure, whether I should add XDP_CHECKSUM_NONE, because it would 
> be equal to returning -ENODATA from kfunc, but after giving it some thought now, 
> it is worth to have XDP_CHECKSUM_NONE for packets that have no checksum to 
> check, like for hash there is XDP_RSS_TYPE_L2.

On receive, CHECKSUM_NONE means that the packet has not been checked, not
necessarily that it has no checksum. Perhaps the device was unable to
parse the protocol.

(on transmit, it conveys that a transmit checksum is not required.)

[xdp-hints] Re: [PATCH bpf-next v3 10/21] ice: Implement VLAN tag hint

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 07:50:27PM +0100, Simon Horman wrote:
> On Wed, Jul 19, 2023 at 08:37:23PM +0200, Larysa Zaremba wrote:
> 
> ...
> 
> > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > index b11cfaedb81c..4ad6db83674e 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > @@ -639,7 +639,33 @@ static int ice_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
> >  	return 0;
> >  }
> >  
> > +/**
> > + * ice_xdp_rx_vlan_tag - VLAN tag XDP hint handler
> > + * @ctx: XDP buff pointer
> > + * @vlan_tci: destination address for VLAN tag
> > + * @vlan_proto: destination address for VLAN protocol
> > + *
> > + * Copy VLAN tag (if was stripped) and corresponding protocol
> > + * to the destination address.
> > + */
> > +static int ice_xdp_rx_vlan_tag(const struct xdp_md *ctx, u16 *vlan_tci,
> > +			       __be16 *vlan_proto)
> > +{
> > +	const struct ice_xdp_buff *xdp_ext = (void *)ctx;
> > +
> > +	*vlan_proto = xdp_ext->pkt_ctx.vlan_proto;
> > +	if (!*vlan_proto)
> > +		return -ENODATA;
> > +
> > +	*vlan_tci = ice_get_vlan_tci(xdp_ext->pkt_ctx.eop_desc);
> > +	if (!*vlan_tag)
> 
> Hi Larysa,
> 
> Should this be vlan_tci rather than vlan_tag?
> 

Yes! I have no idea, how this has happened >_<

> > +		return -ENODATA;
> > +
> > +	return 0;
> > +}
> > +
> 
> ...

[xdp-hints] Re: [PATCH bpf-next v3 16/21] selftests/bpf: Add flags and new hints to xdp_hw_metadata

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 03:00:48PM -0700, Stanislav Fomichev wrote:
> On 07/19, Larysa Zaremba wrote:
> > Add hints added in the previous patches (VLAN tag and checksum)
> > to the xdp_hw_metadata program.
> > 
> > Also, to make metadata layout more straightforward, add flags field
> > to pass information about validity of every separate hint separately.
> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> 
> Acked-by: Stanislav Fomichev <sdf@google.com>
> 
> with a small nit below
> 
> > ---
> >  .../selftests/bpf/progs/xdp_hw_metadata.c     | 37 +++++++--
> >  tools/testing/selftests/bpf/xdp_hw_metadata.c | 79 +++++++++++++++++--
> >  tools/testing/selftests/bpf/xdp_metadata.h    | 31 +++++++-
> >  3 files changed, 135 insertions(+), 12 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> > index 63d7de6c6bbb..75a61317668d 100644
> > --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> > +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> > @@ -20,6 +20,12 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
> >  					 __u64 *timestamp) __ksym;
> >  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
> >  				    enum xdp_rss_hash_type *rss_type) __ksym;
> > +extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> > +					__u16 *vlan_tci,
> > +					__be16 *vlan_proto) __ksym;
> > +extern int bpf_xdp_metadata_rx_csum(const struct xdp_md *ctx,
> > +				    enum xdp_csum_status *csum_status,
> > +				    union xdp_csum_info *csum_info) __ksym;
> >  
> >  SEC("xdp")
> >  int rx(struct xdp_md *ctx)
> > @@ -84,15 +90,36 @@ int rx(struct xdp_md *ctx)
> >  		return XDP_PASS;
> >  	}
> >  
> > +	meta->hint_valid = 0;
> > +
> >  	err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
> > -	if (!err)
> > +	if (err) {
> > +		meta->rx_timestamp_err = err;
> > +	} else {
> > +		meta->hint_valid |= XDP_META_FIELD_TS;
> >  		meta->xdp_timestamp = bpf_ktime_get_tai_ns();
> > +	}
> 
> Maybe we can call bpf_ktime_get_tai_ns unconditionally? Then it will
> match the rest formatting-wise (no {}).
> 
> meta->xdp_timestamp = bpf_ktime_get_tai_ns();
> 
> err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
> if (err)
> 	meta->rx_timestamp_err = err;
> else
> 	meta->hint_valid |= XDP_META_FIELD_TS;
> 
> WDYT?
>

Will do
 
> > +
> > +	err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash,
> > +				       &meta->rx_hash_type);
> > +	if (err)
> > +		meta->rx_hash_err = err;
> >  	else
> > -		meta->rx_timestamp = 0; /* Used by AF_XDP as not avail signal */
> > +		meta->hint_valid |= XDP_META_FIELD_RSS;
> >  
> > -	err = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> > -	if (err < 0)
> > -		meta->rx_hash_err = err; /* Used by AF_XDP as no hash signal */
> > +	err = bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci,
> > +					   &meta->rx_vlan_proto);
> > +	if (err)
> > +		meta->rx_vlan_tag_err = err;
> > +	else
> > +		meta->hint_valid |= XDP_META_FIELD_VLAN_TAG;
> > +
> > +	err = bpf_xdp_metadata_rx_csum(ctx, &meta->rx_csum_status,
> > +				       (void *)&meta->rx_csum_info);
> > +	if (err)
> > +		meta->rx_csum_err = err;
> > +	else
> > +		meta->hint_valid |= XDP_META_FIELD_CSUM;
> >  
> >  	__sync_add_and_fetch(&pkts_redir, 1);
> >  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> > diff --git a/tools/testing/selftests/bpf/xdp_hw_metadata.c b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> > index 613321eb84c1..a045de7dc910 100644
> > --- a/tools/testing/selftests/bpf/xdp_hw_metadata.c
> > +++ b/tools/testing/selftests/bpf/xdp_hw_metadata.c
> > @@ -19,6 +19,9 @@
> >  #include "xsk.h"
> >  
> >  #include <error.h>
> > +#include <linux/kernel.h>
> > +#include <linux/bits.h>
> > +#include <linux/bitfield.h>
> >  #include <linux/errqueue.h>
> >  #include <linux/if_link.h>
> >  #include <linux/net_tstamp.h>
> > @@ -150,21 +153,70 @@ static __u64 gettime(clockid_t clock_id)
> >  	return (__u64) t.tv_sec * NANOSEC_PER_SEC + t.tv_nsec;
> >  }
> >  
> > +#define VLAN_PRIO_MASK		GENMASK(15, 13) /* Priority Code Point */
> > +#define VLAN_DEI_MASK		GENMASK(12, 12) /* Drop Eligible Indicator */
> > +#define VLAN_VID_MASK		GENMASK(11, 0)	/* VLAN Identifier */
> > +static void print_vlan_tci(__u16 tag)
> > +{
> > +	__u16 vlan_id = FIELD_GET(VLAN_VID_MASK, tag);
> > +	__u8 pcp = FIELD_GET(VLAN_PRIO_MASK, tag);
> > +	bool dei = FIELD_GET(VLAN_DEI_MASK, tag);
> > +
> > +	printf("PCP=%u, DEI=%d, VID=0x%X\n", pcp, dei, vlan_id);
> > +}
> > +
> > +#define XDP_CHECKSUM_VALID_NUM_MASK	GENMASK(2, 0)
> > +#define XDP_CHECKSUM_PARTIAL		BIT(3)
> > +#define XDP_CHECKSUM_COMPLETE		BIT(4)
> > +
> > +struct partial_csum_info {
> > +	__u16 csum_start;
> > +	__u16 csum_offset;
> > +};
> > +
> > +static void print_csum_state(__u32 status, __u32 info)
> > +{
> > +	u8 csum_num = status & XDP_CHECKSUM_VALID_NUM_MASK;
> > +
> > +	printf("Checksum status: ");
> > +	if (status != XDP_CHECKSUM_PARTIAL &&
> > +	    status & ~(XDP_CHECKSUM_COMPLETE | XDP_CHECKSUM_VALID_NUM_MASK))
> > +		printf("cannot be interpreted, status=0x%X\n", status);
> > +
> > +	if (status == XDP_CHECKSUM_PARTIAL) {
> > +		struct partial_csum_info *partial_info = (void *)&info;
> > +
> > +		printf("partial, csum_start=%u, csum_offset=%u\n",
> > +		       partial_info->csum_start, partial_info->csum_offset);
> > +		return;
> > +	}
> > +
> > +	if (status & XDP_CHECKSUM_COMPLETE)
> > +		printf("complete, checksum=0x%X%s", info,
> > +		       csum_num ? ", " : "\n");
> > +
> > +	if (csum_num > 1)
> > +		printf("%u consecutive checksums are verified\n", csum_num);
> > +	else if (csum_num)
> > +		printf("outermost checksum is verified\n");
> > +}
> > +
> >  static void verify_xdp_metadata(void *data, clockid_t clock_id)
> >  {
> >  	struct xdp_meta *meta;
> >  
> >  	meta = data - sizeof(*meta);
> >  
> > -	if (meta->rx_hash_err < 0)
> > -		printf("No rx_hash err=%d\n", meta->rx_hash_err);
> > -	else
> > +	if (meta->hint_valid & XDP_META_FIELD_RSS)
> >  		printf("rx_hash: 0x%X with RSS type:0x%X\n",
> >  		       meta->rx_hash, meta->rx_hash_type);
> > +	else
> > +		printf("No rx_hash, err=%d\n", meta->rx_hash_err);
> > +
> > +	if (meta->hint_valid & XDP_META_FIELD_TS) {
> > +		printf("rx_timestamp:  %llu (sec:%0.4f)\n", meta->rx_timestamp,
> > +		       (double)meta->rx_timestamp / NANOSEC_PER_SEC);
> >  
> > -	printf("rx_timestamp:  %llu (sec:%0.4f)\n", meta->rx_timestamp,
> > -	       (double)meta->rx_timestamp / NANOSEC_PER_SEC);
> > -	if (meta->rx_timestamp) {
> >  		__u64 usr_clock = gettime(clock_id);
> >  		__u64 xdp_clock = meta->xdp_timestamp;
> >  		__s64 delta_X = xdp_clock - meta->rx_timestamp;
> > @@ -179,8 +231,23 @@ static void verify_xdp_metadata(void *data, clockid_t clock_id)
> >  		       usr_clock, (double)usr_clock / NANOSEC_PER_SEC,
> >  		       (double)delta_X2U / NANOSEC_PER_SEC,
> >  		       (double)delta_X2U / 1000);
> > +	} else {
> > +		printf("No rx_timestamp, err=%d\n", meta->rx_timestamp_err);
> >  	}
> >  
> > +	if (meta->hint_valid & XDP_META_FIELD_VLAN_TAG) {
> > +		printf("rx_vlan_proto: 0x%X\n", ntohs(meta->rx_vlan_proto));
> > +		printf("rx_vlan_tci: ");
> > +		print_vlan_tci(meta->rx_vlan_tci);
> > +	} else {
> > +		printf("No rx_vlan_tci or rx_vlan_proto, err=%d\n",
> > +		       meta->rx_vlan_tag_err);
> > +	}
> > +
> > +	if (meta->hint_valid & XDP_META_FIELD_CSUM)
> > +		print_csum_state(meta->rx_csum_status, meta->rx_csum_info);
> > +	else
> > +		printf("Checksum was not checked, err=%d\n", meta->rx_csum_err);
> >  }
> >  
> >  static void verify_skb_metadata(int fd)
> > diff --git a/tools/testing/selftests/bpf/xdp_metadata.h b/tools/testing/selftests/bpf/xdp_metadata.h
> > index 6664893c2c77..95e7b53d6bfb 100644
> > --- a/tools/testing/selftests/bpf/xdp_metadata.h
> > +++ b/tools/testing/selftests/bpf/xdp_metadata.h
> > @@ -17,12 +17,41 @@
> >  #define ETH_P_8021AD 0x88A8
> >  #endif
> >  
> > +#ifndef BIT
> > +#define BIT(nr)			(1 << (nr))
> > +#endif
> > +
> > +enum xdp_meta_field {
> > +	XDP_META_FIELD_TS	= BIT(0),
> > +	XDP_META_FIELD_RSS	= BIT(1),
> > +	XDP_META_FIELD_VLAN_TAG	= BIT(2),
> > +	XDP_META_FIELD_CSUM	= BIT(3),
> > +};
> > +
> >  struct xdp_meta {
> > -	__u64 rx_timestamp;
> > +	union {
> > +		__u64 rx_timestamp;
> > +		__s32 rx_timestamp_err;
> > +	};
> >  	__u64 xdp_timestamp;
> >  	__u32 rx_hash;
> >  	union {
> >  		__u32 rx_hash_type;
> >  		__s32 rx_hash_err;
> >  	};
> > +	union {
> > +		struct {
> > +			__u16 rx_vlan_tci;
> > +			__be16 rx_vlan_proto;
> > +		};
> > +		__s32 rx_vlan_tag_err;
> > +	};
> > +	union {
> > +		struct {
> > +			__u32 rx_csum_status;
> > +			__u32 rx_csum_info;
> > +		};
> > +		__s32 rx_csum_err;
> > +	};
> > +	enum xdp_meta_field hint_valid;
> >  };
> > -- 
> > 2.41.0
> > 
> 

[xdp-hints] Re: [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto in xdp_metadata

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 03:14:15PM -0700, Stanislav Fomichev wrote:
> On 07/19, Larysa Zaremba wrote:
> > Verify, whether VLAN tag and proto are set correctly.
> > 
> > To simulate "stripped" VLAN tag on veth, send test packet from VLAN
> > interface.
> > 
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> 
> Acked-by: Stanislav Fomichev <sdf@google.com>
> 
> > ---
> >  .../selftests/bpf/prog_tests/xdp_metadata.c   | 22 +++++++++++++++++--
> >  .../selftests/bpf/progs/xdp_metadata.c        |  4 ++++
> >  2 files changed, 24 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > index 1877e5c6d6c7..6665cf0c59cc 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > @@ -38,7 +38,15 @@
> >  #define TX_MAC "00:00:00:00:00:01"
> >  #define RX_MAC "00:00:00:00:00:02"
> >  
> > +#define VLAN_ID 59
> > +#define VLAN_ID_STR "59"
> 
> I was looking whether we have some str(x) macro in the selftests,
> but doesn't look like we have any...
> 

I could add one, if you could hint me at the file, where it would need to go.
Or just add it locally for now?

> > +#define VLAN_PROTO "802.1Q"
> > +#define VLAN_PID htons(ETH_P_8021Q)
> > +#define TX_NAME_VLAN TX_NAME "." VLAN_ID_STR
> > +#define RX_NAME_VLAN RX_NAME "." VLAN_ID_STR
> > +
> >  #define XDP_RSS_TYPE_L4 BIT(3)
> > +#define VLAN_VID_MASK 0xfff
> >  
> >  struct xsk {
> >  	void *umem_area;
> > @@ -215,6 +223,12 @@ static int verify_xsk_metadata(struct xsk *xsk)
> >  	if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
> >  		return -1;
> >  
> > +	if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
> > +		return -1;
> > +
> > +	if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
> > +		return -1;
> > +
> >  	xsk_ring_cons__release(&xsk->rx, 1);
> >  	refill_rx(xsk, comp_addr);
> >  
> > @@ -248,10 +262,14 @@ void test_xdp_metadata(void)
> >  
> >  	SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
> >  	SYS(out, "ip link set dev " TX_NAME " up");
> > -	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
> > +
> > +	SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
> > +		 " type vlan proto " VLAN_PROTO " id " VLAN_ID_STR);
> > +	SYS(out, "ip link set dev " TX_NAME_VLAN " up");
> > +	SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
> >  
> >  	/* Avoid ARP calls */
> > -	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
> > +	SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
> >  	close_netns(tok);
> >  
> >  	tok = open_netns(RX_NETNS_NAME);
> > diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > index d151d406a123..d3111649170e 100644
> > --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > @@ -23,6 +23,9 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
> >  					 __u64 *timestamp) __ksym;
> >  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
> >  				    enum xdp_rss_hash_type *rss_type) __ksym;
> > +extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> > +					__u16 *vlan_tci,
> > +					__be16 *vlan_proto) __ksym;
> >  
> >  SEC("xdp")
> >  int rx(struct xdp_md *ctx)
> > @@ -57,6 +60,7 @@ int rx(struct xdp_md *ctx)
> >  		meta->rx_timestamp = 1;
> >  
> >  	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> > +	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
> >  
> >  	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> >  }
> > -- 
> > 2.41.0
> > 
> 

[xdp-hints] Re: [PATCH bpf-next v3 12/21] xdp: Add checksum hint

[Zaremba, Larysa]

On Thu, Jul 20, 2023 at 06:27:41PM -0400, Willem de Bruijn wrote:
> Zaremba, Larysa wrote:
> > On Thu, Jul 20, 2023 at 09:55:16AM -0400, Willem de Bruijn wrote:
> > > Zaremba, Larysa wrote:
> > > > On Thu, Jul 20, 2023 at 09:57:05AM +0000, Zaremba, Larysa wrote:
> > > > > On Wed, Jul 19, 2023 at 05:42:04PM -0400, Willem de Bruijn wrote:
> > > > > > Larysa Zaremba wrote:
> > > > > > > Implement functionality that enables drivers to expose to XDP code checksum
> > > > > > > information that consists of:
> > > > > > > 
> > > > > > > - Checksum status - bitfield that consists of
> > > > > > >   - number of consecutive validated checksums. This is almost the same as
> > > > > > >     csum_level in skb, but starts with 1. Enum names for those bits still
> > > > > > >     use checksum level concept, so it is less confusing for driver
> > > > > > >     developers.
> > > > > > >   - Is checksum partial? This bit cannot coexist with any other
> > > > > > >   - Is there a complete checksum available?
> > > > > > > - Additional checksum data, a union of:
> > > > > > >   - checksum start and offset, if checksum is partial
> > > > > > >   - complete checksum, if available
> > > > > > > 
> > > > > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > > > > > ---
> > > > > > >  Documentation/networking/xdp-rx-metadata.rst |  3 ++
> > > > > > >  include/linux/netdevice.h                    |  3 ++
> > > > > > >  include/net/xdp.h                            | 46 ++++++++++++++++++++
> > > > > > >  kernel/bpf/offload.c                         |  2 +
> > > > > > >  net/core/xdp.c                               | 23 ++++++++++
> > > > > > >  5 files changed, 77 insertions(+)
> > > > > > > 
> > > > > > > diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
> > > > > > > index ea6dd79a21d3..7f056a44f682 100644
> > > > > > > --- a/Documentation/networking/xdp-rx-metadata.rst
> > > > > > > +++ b/Documentation/networking/xdp-rx-metadata.rst
> > > > > > > @@ -26,6 +26,9 @@ metadata is supported, this set will grow:
> > > > > > >  .. kernel-doc:: net/core/xdp.c
> > > > > > >     :identifiers: bpf_xdp_metadata_rx_vlan_tag
> > > > > > >  
> > > > > > > +.. kernel-doc:: net/core/xdp.c
> > > > > > > +   :identifiers: bpf_xdp_metadata_rx_csum
> > > > > > > +
> > > > > > >  An XDP program can use these kfuncs to read the metadata into stack
> > > > > > >  variables for its own consumption. Or, to pass the metadata on to other
> > > > > > >  consumers, an XDP program can store it into the metadata area carried
> > > > > > > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > > > > > index 1749f4f75c64..4f6da36ac123 100644
> > > > > > > --- a/include/linux/netdevice.h
> > > > > > > +++ b/include/linux/netdevice.h
> > > > > > > @@ -1660,6 +1660,9 @@ struct xdp_metadata_ops {
> > > > > > >  			       enum xdp_rss_hash_type *rss_type);
> > > > > > >  	int	(*xmo_rx_vlan_tag)(const struct xdp_md *ctx, u16 *vlan_tci,
> > > > > > >  				   __be16 *vlan_proto);
> > > > > > > +	int	(*xmo_rx_csum)(const struct xdp_md *ctx,
> > > > > > > +			       enum xdp_csum_status *csum_status,
> > > > > > > +			       union xdp_csum_info *csum_info);
> > > > > > >  };
> > > > > > >  
> > > > > > >  /**
> > > > > > > diff --git a/include/net/xdp.h b/include/net/xdp.h
> > > > > > > index 89c58f56ffc6..2b7a7d678ff4 100644
> > > > > > > --- a/include/net/xdp.h
> > > > > > > +++ b/include/net/xdp.h
> > > > > > > @@ -391,6 +391,8 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
> > > > > > >  			   bpf_xdp_metadata_rx_hash) \
> > > > > > >  	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
> > > > > > >  			   bpf_xdp_metadata_rx_vlan_tag) \
> > > > > > > +	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_CSUM, \
> > > > > > > +			   bpf_xdp_metadata_rx_csum) \
> > > > > > >  
> > > > > > >  enum {
> > > > > > >  #define XDP_METADATA_KFUNC(name, _) name,
> > > > > > > @@ -448,6 +450,50 @@ enum xdp_rss_hash_type {
> > > > > > >  	XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
> > > > > > >  };
> > > > > > >  
> > > > > > > +union xdp_csum_info {
> > > > > > > +	/* Checksum referred to by ``csum_start + csum_offset`` is considered
> > > > > > > +	 * valid, but was never calculated, TX device has to do this,
> > > > > > > +	 * starting from csum_start packet byte.
> > > > > > > +	 * Any preceding checksums are also considered valid.
> > > > > > > +	 * Available, if ``status == XDP_CHECKSUM_PARTIAL``.
> > > > > > > +	 */
> > > > > > > +	struct {
> > > > > > > +		u16 csum_start;
> > > > > > > +		u16 csum_offset;
> > > > > > > +	};
> > > > > > > +
> > > > > > > +	/* Checksum, calculated over the whole packet.
> > > > > > > +	 * Available, if ``status & XDP_CHECKSUM_COMPLETE``.
> > > > > > > +	 */
> > > > > > > +	u32 checksum;
> > > > > > > +};
> > > > > > > +
> > > > > > > +enum xdp_csum_status {
> > > > > > > +	/* HW had parsed several transport headers and validated their
> > > > > > > +	 * checksums, same as ``CHECKSUM_UNNECESSARY`` in ``sk_buff``.
> > > > > > > +	 * 3 least significat bytes contain number of consecutive checksum,
> > > > > > 
> > > > > > typo: significant
> > > > > > 
> > > > > > (I did not scan for typos, just came across this when trying to understand
> > > > > > the skb->csum_level + 1 trick. Probably good to run a spell check).
> > > > > >
> > > > 
> > > > Oh, and about skb->csum_level + 1, maybe this way it would be more 
> > > > understandable: XDP_CHECKSUM_VALID_LVL0 + skb->csum_level?
> > > 
> > > Agreed, that would help document the intent.
> > >  
> > > > Using number of valid checksums (starts with 1) instead of checksum level 
> > > > (starts with 0) is a debatable decision, but I have decided to go with it under 
> > > > 2 assumptions:
> > > > 
> > > > - the only reason checksum level in skb starts with 0 is to use less bits
> > > > - checksum number would be more intuitive for XDP/AF_XDP application developers
> > > > 
> > > > I encourage everyone to share their opinion on that.
> > > 
> > > I assumed this offset by one was because csum_status zero implicitly
> > > meant XDP_CHECKSUM_NONE. Is that not correct? That should probably
> > > get an explicit name.
> > > 
> > 
> > Well, I was not sure, whether I should add XDP_CHECKSUM_NONE, because it would 
> > be equal to returning -ENODATA from kfunc, but after giving it some thought now, 
> > it is worth to have XDP_CHECKSUM_NONE for packets that have no checksum to 
> > check, like for hash there is XDP_RSS_TYPE_L2.
> 
> On receive, CHECKSUM_NONE means that the packet has not been checked, not
> necessarily that it has no checksum. Perhaps the device was unable to
> parse the protocol.
> 
> (on transmit, it conveys that a transmit checksum is not required.)

Oh, my bad, I have re-read the docs and for packets without checksum, 
CHECKSUM_UNNECESSARY instead conveys "CRC in OK". In such case, 
XDP_CHECKSUM_NONE becomes a full equivalent of returning -ENODATA from kfunc, so 
I do not think XDP_CHECKSUM_NONE enum is worth including, because it coud lead 
to new people writing programs in such way:

if (bpf_xdp_metadata_rx_csum(ctx, &csum_status, &rx_csum_info))
	fallback();

if (csum_status == XDP_CHECKSUM_NONE)
	fallback();
[...]

[xdp-hints] Re: [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto in xdp_metadata

[Stanislav Fomichev]

On Fri, Jul 21, 2023 at 12:47 AM Zaremba, Larysa
<larysa.zaremba@intel.com> wrote:
>
> On Thu, Jul 20, 2023 at 03:14:15PM -0700, Stanislav Fomichev wrote:
> > On 07/19, Larysa Zaremba wrote:
> > > Verify, whether VLAN tag and proto are set correctly.
> > >
> > > To simulate "stripped" VLAN tag on veth, send test packet from VLAN
> > > interface.
> > >
> > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> >
> > Acked-by: Stanislav Fomichev <sdf@google.com>
> >
> > > ---
> > >  .../selftests/bpf/prog_tests/xdp_metadata.c   | 22 +++++++++++++++++--
> > >  .../selftests/bpf/progs/xdp_metadata.c        |  4 ++++
> > >  2 files changed, 24 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > > index 1877e5c6d6c7..6665cf0c59cc 100644
> > > --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > > +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > > @@ -38,7 +38,15 @@
> > >  #define TX_MAC "00:00:00:00:00:01"
> > >  #define RX_MAC "00:00:00:00:00:02"
> > >
> > > +#define VLAN_ID 59
> > > +#define VLAN_ID_STR "59"
> >
> > I was looking whether we have some str(x) macro in the selftests,
> > but doesn't look like we have any...
> >
>
> I could add one, if you could hint me at the file, where it would need to go.
> Or just add it locally for now?

Up to you. I feel like it's fine as is.

I was expecting to find something like the following in
tools/testing/selftests/bpf/testing_helpers.h:

#define __TO_STR(x) #x
#define TO_STR(x) __TO_STR(x)

We have similar patterns in:
tools/testing/selftests/bpf/sdt.h (_SDT_ARG_CONSTRAINT_STRING)
tools/testing/selftests/kvm/x86_64/smm_test.c (XSTR)
tools/tracing/rtla/src/utils.c (STR)

But nothing "generic" it seems...

> > > +#define VLAN_PROTO "802.1Q"
> > > +#define VLAN_PID htons(ETH_P_8021Q)
> > > +#define TX_NAME_VLAN TX_NAME "." VLAN_ID_STR
> > > +#define RX_NAME_VLAN RX_NAME "." VLAN_ID_STR
> > > +
> > >  #define XDP_RSS_TYPE_L4 BIT(3)
> > > +#define VLAN_VID_MASK 0xfff
> > >
> > >  struct xsk {
> > >     void *umem_area;
> > > @@ -215,6 +223,12 @@ static int verify_xsk_metadata(struct xsk *xsk)
> > >     if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
> > >             return -1;
> > >
> > > +   if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
> > > +           return -1;
> > > +
> > > +   if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
> > > +           return -1;
> > > +
> > >     xsk_ring_cons__release(&xsk->rx, 1);
> > >     refill_rx(xsk, comp_addr);
> > >
> > > @@ -248,10 +262,14 @@ void test_xdp_metadata(void)
> > >
> > >     SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
> > >     SYS(out, "ip link set dev " TX_NAME " up");
> > > -   SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
> > > +
> > > +   SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
> > > +            " type vlan proto " VLAN_PROTO " id " VLAN_ID_STR);
> > > +   SYS(out, "ip link set dev " TX_NAME_VLAN " up");
> > > +   SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
> > >
> > >     /* Avoid ARP calls */
> > > -   SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
> > > +   SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
> > >     close_netns(tok);
> > >
> > >     tok = open_netns(RX_NETNS_NAME);
> > > diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > > index d151d406a123..d3111649170e 100644
> > > --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > > +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > > @@ -23,6 +23,9 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
> > >                                      __u64 *timestamp) __ksym;
> > >  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
> > >                                 enum xdp_rss_hash_type *rss_type) __ksym;
> > > +extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> > > +                                   __u16 *vlan_tci,
> > > +                                   __be16 *vlan_proto) __ksym;
> > >
> > >  SEC("xdp")
> > >  int rx(struct xdp_md *ctx)
> > > @@ -57,6 +60,7 @@ int rx(struct xdp_md *ctx)
> > >             meta->rx_timestamp = 1;
> > >
> > >     bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> > > +   bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
> > >
> > >     return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> > >  }
> > > --
> > > 2.41.0
> > >
> >

[xdp-hints] Re: [PATCH bpf-next v3 20/21] selftests/bpf: Check VLAN tag and proto in xdp_metadata

[Larysa Zaremba]

On Fri, Jul 21, 2023 at 09:44:17AM -0700, Stanislav Fomichev wrote:
> On Fri, Jul 21, 2023 at 12:47 AM Zaremba, Larysa
> <larysa.zaremba@intel.com> wrote:
> >
> > On Thu, Jul 20, 2023 at 03:14:15PM -0700, Stanislav Fomichev wrote:
> > > On 07/19, Larysa Zaremba wrote:
> > > > Verify, whether VLAN tag and proto are set correctly.
> > > >
> > > > To simulate "stripped" VLAN tag on veth, send test packet from VLAN
> > > > interface.
> > > >
> > > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > >
> > > Acked-by: Stanislav Fomichev <sdf@google.com>
> > >
> > > > ---
> > > >  .../selftests/bpf/prog_tests/xdp_metadata.c   | 22 +++++++++++++++++--
> > > >  .../selftests/bpf/progs/xdp_metadata.c        |  4 ++++
> > > >  2 files changed, 24 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > > > index 1877e5c6d6c7..6665cf0c59cc 100644
> > > > --- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > > > +++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
> > > > @@ -38,7 +38,15 @@
> > > >  #define TX_MAC "00:00:00:00:00:01"
> > > >  #define RX_MAC "00:00:00:00:00:02"
> > > >
> > > > +#define VLAN_ID 59
> > > > +#define VLAN_ID_STR "59"
> > >
> > > I was looking whether we have some str(x) macro in the selftests,
> > > but doesn't look like we have any...
> > >
> >
> > I could add one, if you could hint me at the file, where it would need to go.
> > Or just add it locally for now?
> 
> Up to you. I feel like it's fine as is.
>

I need to send v4 with some minor changes anyway, so will add in v4.

> I was expecting to find something like the following in
> tools/testing/selftests/bpf/testing_helpers.h:
> 
> #define __TO_STR(x) #x
> #define TO_STR(x) __TO_STR(x)
> 
> We have similar patterns in:
> tools/testing/selftests/bpf/sdt.h (_SDT_ARG_CONSTRAINT_STRING)
> tools/testing/selftests/kvm/x86_64/smm_test.c (XSTR)
> tools/tracing/rtla/src/utils.c (STR)
> 
> But nothing "generic" it seems...
> 
> > > > +#define VLAN_PROTO "802.1Q"
> > > > +#define VLAN_PID htons(ETH_P_8021Q)
> > > > +#define TX_NAME_VLAN TX_NAME "." VLAN_ID_STR
> > > > +#define RX_NAME_VLAN RX_NAME "." VLAN_ID_STR
> > > > +
> > > >  #define XDP_RSS_TYPE_L4 BIT(3)
> > > > +#define VLAN_VID_MASK 0xfff
> > > >
> > > >  struct xsk {
> > > >     void *umem_area;
> > > > @@ -215,6 +223,12 @@ static int verify_xsk_metadata(struct xsk *xsk)
> > > >     if (!ASSERT_NEQ(meta->rx_hash_type & XDP_RSS_TYPE_L4, 0, "rx_hash_type"))
> > > >             return -1;
> > > >
> > > > +   if (!ASSERT_EQ(meta->rx_vlan_tci & VLAN_VID_MASK, VLAN_ID, "rx_vlan_tci"))
> > > > +           return -1;
> > > > +
> > > > +   if (!ASSERT_EQ(meta->rx_vlan_proto, VLAN_PID, "rx_vlan_proto"))
> > > > +           return -1;
> > > > +
> > > >     xsk_ring_cons__release(&xsk->rx, 1);
> > > >     refill_rx(xsk, comp_addr);
> > > >
> > > > @@ -248,10 +262,14 @@ void test_xdp_metadata(void)
> > > >
> > > >     SYS(out, "ip link set dev " TX_NAME " address " TX_MAC);
> > > >     SYS(out, "ip link set dev " TX_NAME " up");
> > > > -   SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME);
> > > > +
> > > > +   SYS(out, "ip link add link " TX_NAME " " TX_NAME_VLAN
> > > > +            " type vlan proto " VLAN_PROTO " id " VLAN_ID_STR);
> > > > +   SYS(out, "ip link set dev " TX_NAME_VLAN " up");
> > > > +   SYS(out, "ip addr add " TX_ADDR "/" PREFIX_LEN " dev " TX_NAME_VLAN);
> > > >
> > > >     /* Avoid ARP calls */
> > > > -   SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME);
> > > > +   SYS(out, "ip -4 neigh add " RX_ADDR " lladdr " RX_MAC " dev " TX_NAME_VLAN);
> > > >     close_netns(tok);
> > > >
> > > >     tok = open_netns(RX_NETNS_NAME);
> > > > diff --git a/tools/testing/selftests/bpf/progs/xdp_metadata.c b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > > > index d151d406a123..d3111649170e 100644
> > > > --- a/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > > > +++ b/tools/testing/selftests/bpf/progs/xdp_metadata.c
> > > > @@ -23,6 +23,9 @@ extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
> > > >                                      __u64 *timestamp) __ksym;
> > > >  extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
> > > >                                 enum xdp_rss_hash_type *rss_type) __ksym;
> > > > +extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
> > > > +                                   __u16 *vlan_tci,
> > > > +                                   __be16 *vlan_proto) __ksym;
> > > >
> > > >  SEC("xdp")
> > > >  int rx(struct xdp_md *ctx)
> > > > @@ -57,6 +60,7 @@ int rx(struct xdp_md *ctx)
> > > >             meta->rx_timestamp = 1;
> > > >
> > > >     bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
> > > > +   bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_tci, &meta->rx_vlan_proto);
> > > >
> > > >     return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
> > > >  }
> > > > --
> > > > 2.41.0
> > > >
> > >