[xdp-hints] [PATCH bpf-next v7 00/18] XDP metadata via kfuncs for ice + VLAN hint

[xdp-hints] [PATCH bpf-next v7 00/18] XDP metadata via kfuncs for ice + VLAN hint

[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 VLAN tag with protocol XDP hint, it now be accessed by
XDP and userspace (AF_XDP) programs. They can also be checked with xdp_metadata
test and xdp_hw_metadata program.

Impact of these patches on ice performance:
ZC:
* Full hints implementation decreases pps in ZC mode by less than 3%
  (64B, rxdrop)

skb (packets with invalid IP, dropped by stack):
* Overall, patchset improves peak performance in skb mode by about 0.5%

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

v6:
https://lore.kernel.org/bpf/20231012170524.21085-1-larysa.zaremba@intel.com/
Intermediate RFC v2:
https://lore.kernel.org/bpf/20230927075124.23941-1-larysa.zaremba@intel.com/
Intermediate RFC v1:
https://lore.kernel.org/bpf/20230824192703.712881-1-larysa.zaremba@intel.com/
v5:
https://lore.kernel.org/bpf/20230811161509.19722-1-larysa.zaremba@intel.com/
v4:
https://lore.kernel.org/bpf/20230728173923.1318596-1-larysa.zaremba@intel.com/
v3:
https://lore.kernel.org/bpf/20230719183734.21681-1-larysa.zaremba@intel.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 v6:
* add ability to fill cb of all xdp_buffs in xsk_buff_pool
* place just pointer to packet context in ice_xdp_buff
* add const qualifiers in veth implementation
* generate uapi for VLAN hint

Changes since v5:
* drop checksum hint from the patchset entirely
* Alex's patch that lifts the data_meta size limitation is no longer
  required in this patchset, so will be sent separately
* new patch: hide some ice hints code behind a static key
* fix several bugs in ZC mode (ice)
* change argument order in VLAN hint kfunc (tci, proto -> proto, tci)
* cosmetic changes
* analyze performance impact

Changes since v4:
* Drop the concept of partial checksum from the hint design
* Drop the concept of checksum level from the hint design

Changes since v3:
* use XDP_CHECKSUM_VALID_LVL0 + csum_level instead of csum_level + 1
* fix spelling mistakes
* read XDP timestamp unconditionally
* add TO_STR() macro

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

Larysa Zaremba (17):
  ice: make RX hash reading code more reusable
  ice: make RX HW timestamp reading 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
  veth: Implement VLAN tag XDP hint
  net: make vlan_get_tag() return -ENODATA instead of -EINVAL
  mlx5: implement VLAN tag XDP hint
  selftests/bpf: Allow VLAN packets in xdp_hw_metadata
  selftests/bpf: Add flags and VLAN hint to xdp_hw_metadata
  selftests/bpf: Use AF_INET for TX in xdp_metadata
  selftests/bpf: Check VLAN tag and proto in xdp_metadata

Maciej Fijalkowski (1):
  xsk: add functions to fill control buffer

 Documentation/netlink/specs/netdev.yaml       |   4 +
 Documentation/networking/xdp-rx-metadata.rst  |   8 +-
 drivers/net/ethernet/intel/ice/ice.h          |   2 +
 drivers/net/ethernet/intel/ice/ice_base.c     |  14 +
 .../net/ethernet/intel/ice/ice_lan_tx_rx.h    | 412 +++++++++---------
 drivers/net/ethernet/intel/ice/ice_main.c     |  21 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  22 +-
 drivers/net/ethernet/intel/ice/ice_ptp.h      |  16 +-
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  19 +-
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  32 +-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 209 ++++++++-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h |  18 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c      |  29 +-
 .../net/ethernet/mellanox/mlx5/core/en/xdp.c  |  15 +
 drivers/net/veth.c                            |  19 +
 include/linux/if_vlan.h                       |   4 +-
 include/linux/mlx5/device.h                   |   2 +-
 include/net/xdp.h                             |   9 +
 include/net/xdp_sock_drv.h                    |  17 +
 include/net/xsk_buff_pool.h                   |   2 +
 include/uapi/linux/netdev.h                   |   5 +-
 net/core/xdp.c                                |  33 ++
 net/xdp/xsk_buff_pool.c                       |  12 +
 tools/include/uapi/linux/netdev.h             |   5 +-
 tools/net/ynl/generated/netdev-user.c         |   1 +
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 184 ++++----
 .../selftests/bpf/progs/xdp_hw_metadata.c     |  38 +-
 .../selftests/bpf/progs/xdp_metadata.c        |   5 +
 tools/testing/selftests/bpf/testing_helpers.h |   3 +
 tools/testing/selftests/bpf/xdp_hw_metadata.c |  38 +-
 tools/testing/selftests/bpf/xdp_metadata.h    |  34 +-
 31 files changed, 825 insertions(+), 407 deletions(-)

-- 
2.41.0

[xdp-hints] [PATCH bpf-next v7 01/18] 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 | 36 +++++++++++++------
 1 file changed, 25 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 7e06373e14d9..17530359aaf8 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -63,28 +63,42 @@ 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 (unlikely(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 +200,7 @@ 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] Re: [PATCH bpf-next v7 01/18] ice: make RX hash reading code more reusable

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:43PM +0100, Larysa Zaremba wrote:
> 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>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> ---
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 36 +++++++++++++------
>  1 file changed, 25 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 7e06373e14d9..17530359aaf8 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -63,28 +63,42 @@ 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 (unlikely(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 +200,7 @@ 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 v7 02/18] 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      | 20 ++++++-----------
 drivers/net/ethernet/intel/ice/ice_ptp.h      | 16 +++++++++-----
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 22 ++++++++++++++++++-
 3 files changed, 38 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 1eddcbe89b0c..a435f89b262f 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -2103,30 +2103,26 @@ 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 in ns
  * @rx_desc: Receive descriptor
- * @skb: Particular skb to send timestamp with
+ * @rx_ring: Ring to get the cached 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,
+			struct ice_rx_ring *rx_ring)
 {
-	struct skb_shared_hwtstamps *hwtstamps;
 	u64 ts_ns, cached_time;
 	u32 ts_high;
 
 	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
-		return;
+		return 0;
 
 	cached_time = READ_ONCE(rx_ring->cached_phctime);
 
 	/* 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
@@ -2137,9 +2133,7 @@ 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 8f6f94392756..0274da964fe3 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -298,9 +298,8 @@ 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,
+			struct ice_rx_ring *rx_ring);
 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);
@@ -330,9 +329,14 @@ 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,
+		    struct ice_rx_ring *rx_ring)
+{
+	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 17530359aaf8..c4dbbb246946 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -184,6 +184,26 @@ 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 = ice_ptp_get_rx_hwts(rx_desc, rx_ring);
+
+	*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
@@ -208,7 +228,7 @@ 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] Re: [PATCH bpf-next v7 02/18] ice: make RX HW timestamp reading code more reusable

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:44PM +0100, Larysa Zaremba wrote:
> 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>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> ---
>  drivers/net/ethernet/intel/ice/ice_ptp.c      | 20 ++++++-----------
>  drivers/net/ethernet/intel/ice/ice_ptp.h      | 16 +++++++++-----
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 22 ++++++++++++++++++-
>  3 files changed, 38 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> index 1eddcbe89b0c..a435f89b262f 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -2103,30 +2103,26 @@ 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 in ns
>   * @rx_desc: Receive descriptor
> - * @skb: Particular skb to send timestamp with
> + * @rx_ring: Ring to get the cached 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,
> +			struct ice_rx_ring *rx_ring)
>  {
> -	struct skb_shared_hwtstamps *hwtstamps;
>  	u64 ts_ns, cached_time;
>  	u32 ts_high;
>  
>  	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
> -		return;
> +		return 0;
>  
>  	cached_time = READ_ONCE(rx_ring->cached_phctime);
>  
>  	/* 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
> @@ -2137,9 +2133,7 @@ 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 8f6f94392756..0274da964fe3 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.h
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
> @@ -298,9 +298,8 @@ 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,
> +			struct ice_rx_ring *rx_ring);
>  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);
> @@ -330,9 +329,14 @@ 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,
> +		    struct ice_rx_ring *rx_ring)
> +{
> +	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 17530359aaf8..c4dbbb246946 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -184,6 +184,26 @@ 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 = ice_ptp_get_rx_hwts(rx_desc, rx_ring);
> +
> +	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
> +		.hwtstamp	= ns_to_ktime(ts_ns),
> +	};

could this just be

	skb_hwtstamps(skb)->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
> @@ -208,7 +228,7 @@ 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] Re: [PATCH bpf-next v7 02/18] ice: make RX HW timestamp reading code more reusable

[Larysa Zaremba]

On Thu, Nov 16, 2023 at 04:19:37PM +0100, Maciej Fijalkowski wrote:
> On Wed, Nov 15, 2023 at 06:52:44PM +0100, Larysa Zaremba wrote:
> > 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>
> 
> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> 
> > ---
> >  drivers/net/ethernet/intel/ice/ice_ptp.c      | 20 ++++++-----------
> >  drivers/net/ethernet/intel/ice/ice_ptp.h      | 16 +++++++++-----
> >  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 22 ++++++++++++++++++-
> >  3 files changed, 38 insertions(+), 20 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
> > index 1eddcbe89b0c..a435f89b262f 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> > @@ -2103,30 +2103,26 @@ 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 in ns
> >   * @rx_desc: Receive descriptor
> > - * @skb: Particular skb to send timestamp with
> > + * @rx_ring: Ring to get the cached 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,
> > +			struct ice_rx_ring *rx_ring)
> >  {
> > -	struct skb_shared_hwtstamps *hwtstamps;
> >  	u64 ts_ns, cached_time;
> >  	u32 ts_high;
> >  
> >  	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
> > -		return;
> > +		return 0;
> >  
> >  	cached_time = READ_ONCE(rx_ring->cached_phctime);
> >  
> >  	/* 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
> > @@ -2137,9 +2133,7 @@ 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 8f6f94392756..0274da964fe3 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_ptp.h
> > +++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
> > @@ -298,9 +298,8 @@ 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,
> > +			struct ice_rx_ring *rx_ring);
> >  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);
> > @@ -330,9 +329,14 @@ 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,
> > +		    struct ice_rx_ring *rx_ring)
> > +{
> > +	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 17530359aaf8..c4dbbb246946 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > @@ -184,6 +184,26 @@ 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 = ice_ptp_get_rx_hwts(rx_desc, rx_ring);
> > +
> > +	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
> > +		.hwtstamp	= ns_to_ktime(ts_ns),
> > +	};
> 
> could this just be
> 
> 	skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns);
> 
> ?
>

Seem so. The previous logic was basically:

memset(skb_hwtstamps(skb), 0, sizeof(*skb_hwtstamps(skb)));
skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ts_ns);

So it was changed to a more nice-looking '= {}' construct after Olek's review.
Honestly, I've thought memset serves some purpose, but after actually looking at 
the structures it does not seem so. Also, not only intel drivers do such thing, 
seems like some historical artifact.

TLDR: will change :)

> > +}
> > +
> >  /**
> >   * ice_process_skb_fields - Populate skb header fields from Rx descriptor
> >   * @rx_ring: Rx descriptor ring packet is being transacted on
> > @@ -208,7 +228,7 @@ 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 v7 03/18] 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.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
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 c4dbbb246946..1fc1794b8e80 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -204,12 +204,21 @@ 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
@@ -218,8 +227,10 @@ 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 99954508184f..906e383e864a 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -864,7 +864,6 @@ 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, ntc);
 
@@ -944,10 +943,7 @@ 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 v7 04/18] ice: Introduce ice_xdp_buff

[Larysa Zaremba]

In order to use XDP hints via kfuncs we need to put
RX descriptor and miscellaneous data next to xdp_buff.
Same as in hints implementations in other drivers, we achieve
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 CL4, as it isn't used often. This still
leaves 192 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     | 18 +++++++++++++++---
 drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 10 ++++++++++
 3 files changed, 30 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..9efb42f99415 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -257,6 +257,14 @@ enum ice_rx_dtype {
 	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
 };
 
+struct ice_xdp_buff {
+	struct xdp_buff xdp_buff;
+	const union ice_32b_rx_flex_desc *eop_desc;
+};
+
+/* 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 +306,6 @@ 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 +317,16 @@ 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 xdp_buff xdp;
+	};
 	/* CL3 - 3rd cacheline starts here */
 	struct bpf_prog *xdp_prog;
 	u16 rx_offset;
@@ -332,6 +343,7 @@ struct ice_rx_ring {
 	/* CL4 - 4th cacheline starts here */
 	struct ice_channel *ch;
 	struct ice_tx_ring *xdp_ring;
+	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
 	struct xsk_buff_pool *xsk_pool;
 	dma_addr_t dma;			/* physical address of ring */
 	u64 cached_phctime;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
index e1d49e1235b3..81b8856d8e13 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->eop_desc = eop_desc;
+}
 #endif /* !_ICE_TXRX_LIB_H_ */
-- 
2.41.0

[xdp-hints] Re: [PATCH bpf-next v7 04/18] ice: Introduce ice_xdp_buff

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:46PM +0100, Larysa Zaremba wrote:
> In order to use XDP hints via kfuncs we need to put
> RX descriptor and miscellaneous data next to xdp_buff.
> Same as in hints implementations in other drivers, we achieve
> 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 CL4, as it isn't used often. This still
> leaves 192 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     | 18 +++++++++++++++---
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 10 ++++++++++
>  3 files changed, 30 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..9efb42f99415 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx.h
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
> @@ -257,6 +257,14 @@ enum ice_rx_dtype {
>  	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
>  };
>  
> +struct ice_xdp_buff {
> +	struct xdp_buff xdp_buff;
> +	const union ice_32b_rx_flex_desc *eop_desc;
> +};
> +
> +/* Required for compatibility with xdp_buffs from xsk_pool */
> +static_assert(offsetof(struct ice_xdp_buff, xdp_buff) == 0);

That should go to xsk core as a macro and should be used by ZC drivers
that support hints. Useful stuff similar to XSK_CEHCK_PRIV_TYPE() but
check is from the other end.

> +
>  /* indices into GLINT_ITR registers */
>  #define ICE_RX_ITR	ICE_IDX_ITR0
>  #define ICE_TX_ITR	ICE_IDX_ITR1
> @@ -298,7 +306,6 @@ 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 +317,16 @@ 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 xdp_buff xdp;
> +	};
>  	/* CL3 - 3rd cacheline starts here */
>  	struct bpf_prog *xdp_prog;
>  	u16 rx_offset;
> @@ -332,6 +343,7 @@ struct ice_rx_ring {
>  	/* CL4 - 4th cacheline starts here */
>  	struct ice_channel *ch;
>  	struct ice_tx_ring *xdp_ring;
> +	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
>  	struct xsk_buff_pool *xsk_pool;
>  	dma_addr_t dma;			/* physical address of ring */
>  	u64 cached_phctime;
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
> index e1d49e1235b3..81b8856d8e13 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->eop_desc = eop_desc;
> +}
>  #endif /* !_ICE_TXRX_LIB_H_ */
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v7 04/18] ice: Introduce ice_xdp_buff

[Larysa Zaremba]

On Thu, Nov 16, 2023 at 01:52:24PM +0100, Maciej Fijalkowski wrote:
> On Wed, Nov 15, 2023 at 06:52:46PM +0100, Larysa Zaremba wrote:
> > In order to use XDP hints via kfuncs we need to put
> > RX descriptor and miscellaneous data next to xdp_buff.
> > Same as in hints implementations in other drivers, we achieve
> > 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 CL4, as it isn't used often. This still
> > leaves 192 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     | 18 +++++++++++++++---
> >  drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 10 ++++++++++
> >  3 files changed, 30 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..9efb42f99415 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_txrx.h
> > +++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
> > @@ -257,6 +257,14 @@ enum ice_rx_dtype {
> >  	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
> >  };
> >  
> > +struct ice_xdp_buff {
> > +	struct xdp_buff xdp_buff;
> > +	const union ice_32b_rx_flex_desc *eop_desc;
> > +};
> > +
> > +/* Required for compatibility with xdp_buffs from xsk_pool */
> > +static_assert(offsetof(struct ice_xdp_buff, xdp_buff) == 0);
> 
> That should go to xsk core as a macro and should be used by ZC drivers
> that support hints. Useful stuff similar to XSK_CEHCK_PRIV_TYPE() but
> check is from the other end.

Seems like there will be a v8 anyway, so I might as well do this :)

> 
> > +
> >  /* indices into GLINT_ITR registers */
> >  #define ICE_RX_ITR	ICE_IDX_ITR0
> >  #define ICE_TX_ITR	ICE_IDX_ITR1
> > @@ -298,7 +306,6 @@ 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 +317,16 @@ 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 xdp_buff xdp;
> > +	};
> >  	/* CL3 - 3rd cacheline starts here */
> >  	struct bpf_prog *xdp_prog;
> >  	u16 rx_offset;
> > @@ -332,6 +343,7 @@ struct ice_rx_ring {
> >  	/* CL4 - 4th cacheline starts here */
> >  	struct ice_channel *ch;
> >  	struct ice_tx_ring *xdp_ring;
> > +	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
> >  	struct xsk_buff_pool *xsk_pool;
> >  	dma_addr_t dma;			/* physical address of ring */
> >  	u64 cached_phctime;
> > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
> > index e1d49e1235b3..81b8856d8e13 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->eop_desc = eop_desc;
> > +}
> >  #endif /* !_ICE_TXRX_LIB_H_ */
> > -- 
> > 2.41.0
> > 

[xdp-hints] Re: [PATCH bpf-next v7 04/18] ice: Introduce ice_xdp_buff

[Larysa Zaremba]

On Thu, Nov 16, 2023 at 03:55:19AM +0100, Larysa Zaremba wrote:
> On Thu, Nov 16, 2023 at 01:52:24PM +0100, Maciej Fijalkowski wrote:
> > On Wed, Nov 15, 2023 at 06:52:46PM +0100, Larysa Zaremba wrote:
> > > In order to use XDP hints via kfuncs we need to put
> > > RX descriptor and miscellaneous data next to xdp_buff.
> > > Same as in hints implementations in other drivers, we achieve
> > > 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 CL4, as it isn't used often. This still
> > > leaves 192 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     | 18 +++++++++++++++---
> > >  drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 10 ++++++++++
> > >  3 files changed, 30 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..9efb42f99415 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_txrx.h
> > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
> > > @@ -257,6 +257,14 @@ enum ice_rx_dtype {
> > >  	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
> > >  };
> > >  
> > > +struct ice_xdp_buff {
> > > +	struct xdp_buff xdp_buff;
> > > +	const union ice_32b_rx_flex_desc *eop_desc;
> > > +};
> > > +
> > > +/* Required for compatibility with xdp_buffs from xsk_pool */
> > > +static_assert(offsetof(struct ice_xdp_buff, xdp_buff) == 0);
> > 
> > That should go to xsk core as a macro and should be used by ZC drivers
> > that support hints. Useful stuff similar to XSK_CEHCK_PRIV_TYPE() but
> > check is from the other end.
> 
> Seems like there will be a v8 anyway, so I might as well do this :)
>

After going back and forth about this for a few days, I think this is not a good 
idea to include such change into the series.

But I do have to change the comment, this assert is mostly needed, 
because my code converts ice_xdp_buff <-> xdp_buff on multiple occasions (and 
this flooding code with container_of is not a solution).

Currently, XSK_CHECK_PRIV_TYPE() performs the most important task of ensuring 
nothing outside cb[] is overwritten, just fine. Offset check macro could be 
added in a separate patch to the xdp header (instead of xsk_buff_pool.h),  ice 
isn't the only driver relying on xdp_buff inheritance. This will happen only if
I (or someone else) can make such generic macro not look ugly, though.

> > 
> > > +
> > >  /* indices into GLINT_ITR registers */
> > >  #define ICE_RX_ITR	ICE_IDX_ITR0
> > >  #define ICE_TX_ITR	ICE_IDX_ITR1
> > > @@ -298,7 +306,6 @@ 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 +317,16 @@ 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 xdp_buff xdp;
> > > +	};
> > >  	/* CL3 - 3rd cacheline starts here */
> > >  	struct bpf_prog *xdp_prog;
> > >  	u16 rx_offset;
> > > @@ -332,6 +343,7 @@ struct ice_rx_ring {
> > >  	/* CL4 - 4th cacheline starts here */
> > >  	struct ice_channel *ch;
> > >  	struct ice_tx_ring *xdp_ring;
> > > +	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
> > >  	struct xsk_buff_pool *xsk_pool;
> > >  	dma_addr_t dma;			/* physical address of ring */
> > >  	u64 cached_phctime;
> > > diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.h b/drivers/net/ethernet/intel/ice/ice_txrx_lib.h
> > > index e1d49e1235b3..81b8856d8e13 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->eop_desc = eop_desc;
> > > +}
> > >  #endif /* !_ICE_TXRX_LIB_H_ */
> > > -- 
> > > 2.41.0
> > > 
> 

[xdp-hints] [PATCH bpf-next v7 05/18] ice: Support HW timestamp hint

[Larysa Zaremba]

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

Also, introduce packet context, where hints-related data will be stored.
ice_xdp_buff contains only a pointer to this structure, to avoid copying it
in ZC mode later in the series.

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_base.c     |  1 +
 drivers/net/ethernet/intel/ice/ice_main.c     |  1 +
 drivers/net/ethernet/intel/ice/ice_ptp.c      |  6 ++---
 drivers/net/ethernet/intel/ice/ice_ptp.h      |  4 +--
 drivers/net/ethernet/intel/ice/ice_txrx.h     | 10 +++++++-
 drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 25 ++++++++++++++++++-
 7 files changed, 42 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 351e0d36df44..366c82a87e56 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -989,4 +989,6 @@ 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_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index 7fa43827a3f0..2d83f3c029e7 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -575,6 +575,7 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
 
 	xdp_init_buff(&ring->xdp, ice_rx_pg_size(ring) / 2, &ring->xdp_rxq);
 	ring->xdp.data = NULL;
+	ring->xdp_ext.pkt_ctx = &ring->pkt_ctx;
 	err = ice_setup_rx_ctx(ring);
 	if (err) {
 		dev_err(dev, "ice_setup_rx_ctx failed for RxQ %d, err %d\n",
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 6607fa6fe556..cfb6beadcc60 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -3397,6 +3397,7 @@ 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 a435f89b262f..667264c8dc8b 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -2105,12 +2105,12 @@ int ice_ptp_set_ts_config(struct ice_pf *pf, struct ifreq *ifr)
 /**
  * ice_ptp_get_rx_hwts - Get packet Rx timestamp in ns
  * @rx_desc: Receive descriptor
- * @rx_ring: Ring to get the cached time
+ * @pkt_ctx: Packet context to get the cached time
  *
  * The driver receives a notification in the receive descriptor with timestamp.
  */
 u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
-			struct ice_rx_ring *rx_ring)
+			const struct ice_pkt_ctx *pkt_ctx)
 {
 	u64 ts_ns, cached_time;
 	u32 ts_high;
@@ -2118,7 +2118,7 @@ u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
 	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
 		return 0;
 
-	cached_time = READ_ONCE(rx_ring->cached_phctime);
+	cached_time = READ_ONCE(pkt_ctx->cached_phctime);
 
 	/* Do not report a timestamp if we don't have a cached PHC time */
 	if (!cached_time)
diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
index 0274da964fe3..30b382ed204d 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.h
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
@@ -299,7 +299,7 @@ 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);
 
 u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
-			struct ice_rx_ring *rx_ring);
+			const struct ice_pkt_ctx *pkt_ctx);
 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);
@@ -332,7 +332,7 @@ static inline bool ice_ptp_process_ts(struct ice_pf *pf)
 
 static inline u64
 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
-		    struct ice_rx_ring *rx_ring)
+		    const struct ice_pkt_ctx *pkt_ctx)
 {
 	return 0;
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index 9efb42f99415..3d77c058c6de 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -257,9 +257,14 @@ enum ice_rx_dtype {
 	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
 };
 
+struct ice_pkt_ctx {
+	u64 cached_phctime;
+};
+
 struct ice_xdp_buff {
 	struct xdp_buff xdp_buff;
 	const union ice_32b_rx_flex_desc *eop_desc;
+	const struct ice_pkt_ctx *pkt_ctx;
 };
 
 /* Required for compatibility with xdp_buffs from xsk_pool */
@@ -328,6 +333,10 @@ struct ice_rx_ring {
 		struct xdp_buff xdp;
 	};
 	/* CL3 - 3rd cacheline starts here */
+	union {
+		struct ice_pkt_ctx pkt_ctx;
+		u64 cached_phctime;
+	};
 	struct bpf_prog *xdp_prog;
 	u16 rx_offset;
 
@@ -346,7 +355,6 @@ struct ice_rx_ring {
 	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
 	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 1fc1794b8e80..d57019b85641 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -197,7 +197,7 @@ 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 = ice_ptp_get_rx_hwts(rx_desc, rx_ring);
+	u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, &rx_ring->pkt_ctx);
 
 	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
 		.hwtstamp	= ns_to_ktime(ts_ns),
@@ -509,3 +509,26 @@ 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;
+
+	*ts_ns = ice_ptp_get_rx_hwts(xdp_ext->eop_desc,
+				     xdp_ext->pkt_ctx);
+	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] Re: [PATCH bpf-next v7 05/18] ice: Support HW timestamp hint

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:47PM +0100, Larysa Zaremba wrote:
> Use previously refactored code and create a function
> that allows XDP code to read HW timestamp.
> 
> Also, introduce packet context, where hints-related data will be stored.
> ice_xdp_buff contains only a pointer to this structure, to avoid copying it
> in ZC mode later in the series.
> 
> 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>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> ---
>  drivers/net/ethernet/intel/ice/ice.h          |  2 ++
>  drivers/net/ethernet/intel/ice/ice_base.c     |  1 +
>  drivers/net/ethernet/intel/ice/ice_main.c     |  1 +
>  drivers/net/ethernet/intel/ice/ice_ptp.c      |  6 ++---
>  drivers/net/ethernet/intel/ice/ice_ptp.h      |  4 +--
>  drivers/net/ethernet/intel/ice/ice_txrx.h     | 10 +++++++-
>  drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 25 ++++++++++++++++++-
>  7 files changed, 42 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
> index 351e0d36df44..366c82a87e56 100644
> --- a/drivers/net/ethernet/intel/ice/ice.h
> +++ b/drivers/net/ethernet/intel/ice/ice.h
> @@ -989,4 +989,6 @@ 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_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
> index 7fa43827a3f0..2d83f3c029e7 100644
> --- a/drivers/net/ethernet/intel/ice/ice_base.c
> +++ b/drivers/net/ethernet/intel/ice/ice_base.c
> @@ -575,6 +575,7 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
>  
>  	xdp_init_buff(&ring->xdp, ice_rx_pg_size(ring) / 2, &ring->xdp_rxq);
>  	ring->xdp.data = NULL;
> +	ring->xdp_ext.pkt_ctx = &ring->pkt_ctx;
>  	err = ice_setup_rx_ctx(ring);
>  	if (err) {
>  		dev_err(dev, "ice_setup_rx_ctx failed for RxQ %d, err %d\n",
> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> index 6607fa6fe556..cfb6beadcc60 100644
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -3397,6 +3397,7 @@ 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 a435f89b262f..667264c8dc8b 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.c
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
> @@ -2105,12 +2105,12 @@ int ice_ptp_set_ts_config(struct ice_pf *pf, struct ifreq *ifr)
>  /**
>   * ice_ptp_get_rx_hwts - Get packet Rx timestamp in ns
>   * @rx_desc: Receive descriptor
> - * @rx_ring: Ring to get the cached time
> + * @pkt_ctx: Packet context to get the cached time
>   *
>   * The driver receives a notification in the receive descriptor with timestamp.
>   */
>  u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
> -			struct ice_rx_ring *rx_ring)
> +			const struct ice_pkt_ctx *pkt_ctx)
>  {
>  	u64 ts_ns, cached_time;
>  	u32 ts_high;
> @@ -2118,7 +2118,7 @@ u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
>  	if (!(rx_desc->wb.time_stamp_low & ICE_PTP_TS_VALID))
>  		return 0;
>  
> -	cached_time = READ_ONCE(rx_ring->cached_phctime);
> +	cached_time = READ_ONCE(pkt_ctx->cached_phctime);
>  
>  	/* Do not report a timestamp if we don't have a cached PHC time */
>  	if (!cached_time)
> diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.h b/drivers/net/ethernet/intel/ice/ice_ptp.h
> index 0274da964fe3..30b382ed204d 100644
> --- a/drivers/net/ethernet/intel/ice/ice_ptp.h
> +++ b/drivers/net/ethernet/intel/ice/ice_ptp.h
> @@ -299,7 +299,7 @@ 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);
>  
>  u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
> -			struct ice_rx_ring *rx_ring);
> +			const struct ice_pkt_ctx *pkt_ctx);
>  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);
> @@ -332,7 +332,7 @@ static inline bool ice_ptp_process_ts(struct ice_pf *pf)
>  
>  static inline u64
>  ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
> -		    struct ice_rx_ring *rx_ring)
> +		    const struct ice_pkt_ctx *pkt_ctx)
>  {
>  	return 0;
>  }
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
> index 9efb42f99415..3d77c058c6de 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx.h
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
> @@ -257,9 +257,14 @@ enum ice_rx_dtype {
>  	ICE_RX_DTYPE_SPLIT_ALWAYS	= 2,
>  };
>  
> +struct ice_pkt_ctx {
> +	u64 cached_phctime;
> +};
> +
>  struct ice_xdp_buff {
>  	struct xdp_buff xdp_buff;
>  	const union ice_32b_rx_flex_desc *eop_desc;
> +	const struct ice_pkt_ctx *pkt_ctx;
>  };
>  
>  /* Required for compatibility with xdp_buffs from xsk_pool */
> @@ -328,6 +333,10 @@ struct ice_rx_ring {
>  		struct xdp_buff xdp;
>  	};
>  	/* CL3 - 3rd cacheline starts here */
> +	union {
> +		struct ice_pkt_ctx pkt_ctx;
> +		u64 cached_phctime;
> +	};
>  	struct bpf_prog *xdp_prog;
>  	u16 rx_offset;
>  
> @@ -346,7 +355,6 @@ struct ice_rx_ring {
>  	struct ice_rx_ring *next;	/* pointer to next ring in q_vector */
>  	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 1fc1794b8e80..d57019b85641 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -197,7 +197,7 @@ 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 = ice_ptp_get_rx_hwts(rx_desc, rx_ring);
> +	u64 ts_ns = ice_ptp_get_rx_hwts(rx_desc, &rx_ring->pkt_ctx);
>  
>  	*skb_hwtstamps(skb) = (struct skb_shared_hwtstamps){
>  		.hwtstamp	= ns_to_ktime(ts_ns),
> @@ -509,3 +509,26 @@ 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;
> +
> +	*ts_ns = ice_ptp_get_rx_hwts(xdp_ext->eop_desc,
> +				     xdp_ext->pkt_ctx);
> +	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 v7 06/18] 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 d57019b85641..26a2c218e96d 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -529,6 +529,79 @@ 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->eop_desc);
+	*rss_type = ice_xdp_rx_hash_type(xdp_ext->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 349c36fb5fd8..eb77040b4825 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -427,6 +427,7 @@ 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,
@@ -442,11 +443,13 @@ 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 v7 07/18] xsk: add functions to fill control buffer

[Larysa Zaremba]

From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

Commit 94ecc5ca4dbf ("xsk: Add cb area to struct xdp_buff_xsk") has added
a buffer for custom data to xdp_buff_xsk. Particularly, this memory is used
for data, consumed by XDP hints kfuncs. It does not always change on
a per-packet basis and some parts can be set for example, at the same time
as RX queue info.

Add functions to fill all cbs in xsk_buff_pool with the same metadata.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 include/net/xdp_sock_drv.h  | 17 +++++++++++++++++
 include/net/xsk_buff_pool.h |  2 ++
 net/xdp/xsk_buff_pool.c     | 12 ++++++++++++
 3 files changed, 31 insertions(+)

diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
index 1f6fc8c7a84c..6239c37dba5d 100644
--- a/include/net/xdp_sock_drv.h
+++ b/include/net/xdp_sock_drv.h
@@ -14,6 +14,12 @@
 
 #ifdef CONFIG_XDP_SOCKETS
 
+struct xsk_cb_desc {
+	void *src;
+	u8 off;
+	u8 bytes;
+};
+
 void xsk_tx_completed(struct xsk_buff_pool *pool, u32 nb_entries);
 bool xsk_tx_peek_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
 u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 max);
@@ -47,6 +53,12 @@ static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
 	xp_set_rxq_info(pool, rxq);
 }
 
+static inline void xsk_pool_fill_cb(struct xsk_buff_pool *pool,
+				    struct xsk_cb_desc *desc)
+{
+	xp_fill_cb(pool, desc);
+}
+
 static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
 {
 #ifdef CONFIG_NET_RX_BUSY_POLL
@@ -250,6 +262,11 @@ static inline void xsk_pool_set_rxq_info(struct xsk_buff_pool *pool,
 {
 }
 
+static inline void xsk_pool_fill_cb(struct xsk_buff_pool *pool,
+				    struct xsk_cb_desc *desc)
+{
+}
+
 static inline unsigned int xsk_pool_get_napi_id(struct xsk_buff_pool *pool)
 {
 	return 0;
diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
index b0bdff26fc88..f17793ee35d6 100644
--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -12,6 +12,7 @@
 
 struct xsk_buff_pool;
 struct xdp_rxq_info;
+struct xsk_cb_desc;
 struct xsk_queue;
 struct xdp_desc;
 struct xdp_umem;
@@ -132,6 +133,7 @@ static inline void xp_init_xskb_dma(struct xdp_buff_xsk *xskb, struct xsk_buff_p
 
 /* AF_XDP ZC drivers, via xdp_sock_buff.h */
 void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq);
+void xp_fill_cb(struct xsk_buff_pool *pool, struct xsk_cb_desc *desc);
 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 	       unsigned long attrs, struct page **pages, u32 nr_pages);
 void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs);
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index 49cb9f9a09be..a94581041c2c 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -123,6 +123,18 @@ void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq)
 }
 EXPORT_SYMBOL(xp_set_rxq_info);
 
+void xp_fill_cb(struct xsk_buff_pool *pool, struct xsk_cb_desc *desc)
+{
+	u32 i;
+
+	for (i = 0; i < pool->heads_cnt; i++) {
+		struct xdp_buff_xsk *xskb = &pool->heads[i];
+
+		memcpy(xskb->cb + desc->off, desc->src, desc->bytes);
+	}
+}
+EXPORT_SYMBOL(xp_fill_cb);
+
 static void xp_disable_drv_zc(struct xsk_buff_pool *pool)
 {
 	struct netdev_bpf bpf;
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v7 08/18] 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_buff_pool.
Space for metadata sources right after such buffers was already reserved
in commit 94ecc5ca4dbf ("xsk: Add cb area to struct xdp_buff_xsk").

Some things (such as pointer to packet context) do not change on a
per-packet basis, so they can be set at the same time as RX queue info.
On the other hand, RX descriptor is unique for each packet, but is already
known when setting DMA addresses. This minimizes performance impact of
hints on regular packet processing.

Update AF_XDP ZC packet processing to support XDP hints.

Co-developed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_base.c | 13 +++++++++++++
 drivers/net/ethernet/intel/ice/ice_xsk.c  | 17 +++++++++++------
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index 2d83f3c029e7..d3396c1c87a9 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -519,6 +519,18 @@ static int ice_setup_rx_ctx(struct ice_rx_ring *ring)
 	return 0;
 }
 
+static void ice_xsk_pool_fill_cb(struct ice_rx_ring *ring)
+{
+	void *ctx_ptr = &ring->pkt_ctx;
+	struct xsk_cb_desc desc = {};
+
+	desc.src = &ctx_ptr;
+	desc.off = offsetof(struct ice_xdp_buff, pkt_ctx) -
+		   sizeof(struct xdp_buff);
+	desc.bytes = sizeof(ctx_ptr);
+	xsk_pool_fill_cb(ring->xsk_pool, &desc);
+}
+
 /**
  * ice_vsi_cfg_rxq - Configure an Rx queue
  * @ring: the ring being configured
@@ -553,6 +565,7 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
 			if (err)
 				return err;
 			xsk_pool_set_rxq_info(ring->xsk_pool, &ring->xdp_rxq);
+			ice_xsk_pool_fill_cb(ring);
 
 			dev_info(dev, "Registered XDP mem model MEM_TYPE_XSK_BUFF_POOL on Rx ring %d\n",
 				 ring->q_index);
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 906e383e864a..a690e34ea8ae 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -433,7 +433,7 @@ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
 
 /**
  * ice_fill_rx_descs - pick buffers from XSK buffer pool and use it
- * @pool: XSK Buffer pool to pull the buffers from
+ * @rx_ring: rx ring
  * @xdp: SW ring of xdp_buff that will hold the buffers
  * @rx_desc: Pointer to Rx descriptors that will be filled
  * @count: The number of buffers to allocate
@@ -445,19 +445,24 @@ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
  *
  * Returns the amount of allocated Rx descriptors
  */
-static u16 ice_fill_rx_descs(struct xsk_buff_pool *pool, struct xdp_buff **xdp,
+static u16 ice_fill_rx_descs(struct ice_rx_ring *rx_ring, struct xdp_buff **xdp,
 			     union ice_32b_rx_flex_desc *rx_desc, u16 count)
 {
 	dma_addr_t dma;
 	u16 buffs;
 	int i;
 
-	buffs = xsk_buff_alloc_batch(pool, xdp, count);
+	buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, count);
 	for (i = 0; i < buffs; i++) {
 		dma = xsk_buff_xdp_get_dma(*xdp);
 		rx_desc->read.pkt_addr = cpu_to_le64(dma);
 		rx_desc->wb.status_error0 = 0;
 
+		/* Put private info that changes on a per-packet basis
+		 * into xdp_buff_xsk->cb.
+		 */
+		ice_xdp_meta_set_desc(*xdp, rx_desc);
+
 		rx_desc++;
 		xdp++;
 	}
@@ -488,8 +493,7 @@ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
 	xdp = ice_xdp_buf(rx_ring, ntu);
 
 	if (ntu + count >= rx_ring->count) {
-		nb_buffs_extra = ice_fill_rx_descs(rx_ring->xsk_pool, xdp,
-						   rx_desc,
+		nb_buffs_extra = ice_fill_rx_descs(rx_ring, xdp, rx_desc,
 						   rx_ring->count - ntu);
 		if (nb_buffs_extra != rx_ring->count - ntu) {
 			ntu += nb_buffs_extra;
@@ -502,7 +506,7 @@ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
 		ice_release_rx_desc(rx_ring, 0);
 	}
 
-	nb_buffs = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, count);
+	nb_buffs = ice_fill_rx_descs(rx_ring, xdp, rx_desc, count);
 
 	ntu += nb_buffs;
 	if (ntu == rx_ring->count)
@@ -752,6 +756,7 @@ 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}
  */
-- 
2.41.0

[xdp-hints] Re: [PATCH bpf-next v7 08/18] ice: Support XDP hints in AF_XDP ZC mode

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:50PM +0100, Larysa Zaremba wrote:
> In AF_XDP ZC, xdp_buff is not stored on ring,
> instead it is provided by xsk_buff_pool.
> Space for metadata sources right after such buffers was already reserved
> in commit 94ecc5ca4dbf ("xsk: Add cb area to struct xdp_buff_xsk").
> 
> Some things (such as pointer to packet context) do not change on a
> per-packet basis, so they can be set at the same time as RX queue info.
> On the other hand, RX descriptor is unique for each packet, but is already
> known when setting DMA addresses. This minimizes performance impact of
> hints on regular packet processing.
> 
> Update AF_XDP ZC packet processing to support XDP hints.
> 
> Co-developed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> ---
>  drivers/net/ethernet/intel/ice/ice_base.c | 13 +++++++++++++
>  drivers/net/ethernet/intel/ice/ice_xsk.c  | 17 +++++++++++------
>  2 files changed, 24 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
> index 2d83f3c029e7..d3396c1c87a9 100644
> --- a/drivers/net/ethernet/intel/ice/ice_base.c
> +++ b/drivers/net/ethernet/intel/ice/ice_base.c
> @@ -519,6 +519,18 @@ static int ice_setup_rx_ctx(struct ice_rx_ring *ring)
>  	return 0;
>  }
>  
> +static void ice_xsk_pool_fill_cb(struct ice_rx_ring *ring)
> +{
> +	void *ctx_ptr = &ring->pkt_ctx;
> +	struct xsk_cb_desc desc = {};
> +
> +	desc.src = &ctx_ptr;
> +	desc.off = offsetof(struct ice_xdp_buff, pkt_ctx) -
> +		   sizeof(struct xdp_buff);

Took me a while to figure out this offset calculation:D

> +	desc.bytes = sizeof(ctx_ptr);
> +	xsk_pool_fill_cb(ring->xsk_pool, &desc);
> +}
> +
>  /**
>   * ice_vsi_cfg_rxq - Configure an Rx queue
>   * @ring: the ring being configured
> @@ -553,6 +565,7 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
>  			if (err)
>  				return err;
>  			xsk_pool_set_rxq_info(ring->xsk_pool, &ring->xdp_rxq);

A good place for XSK_CHECK_PRIV_TYPE() ?

> +			ice_xsk_pool_fill_cb(ring);
>  
>  			dev_info(dev, "Registered XDP mem model MEM_TYPE_XSK_BUFF_POOL on Rx ring %d\n",
>  				 ring->q_index);
> diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
> index 906e383e864a..a690e34ea8ae 100644
> --- a/drivers/net/ethernet/intel/ice/ice_xsk.c
> +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
> @@ -433,7 +433,7 @@ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
>  
>  /**
>   * ice_fill_rx_descs - pick buffers from XSK buffer pool and use it
> - * @pool: XSK Buffer pool to pull the buffers from
> + * @rx_ring: rx ring
>   * @xdp: SW ring of xdp_buff that will hold the buffers
>   * @rx_desc: Pointer to Rx descriptors that will be filled
>   * @count: The number of buffers to allocate
> @@ -445,19 +445,24 @@ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
>   *
>   * Returns the amount of allocated Rx descriptors
>   */
> -static u16 ice_fill_rx_descs(struct xsk_buff_pool *pool, struct xdp_buff **xdp,
> +static u16 ice_fill_rx_descs(struct ice_rx_ring *rx_ring, struct xdp_buff **xdp,

Might be lack of caffeine on my side, but I don't see a reason for passing
rx_ring down to ice_fill_rx_descs() ?

I see I introduced this in the code example previously but it must have
been some leftover from previous hacking...

Help!

>  			     union ice_32b_rx_flex_desc *rx_desc, u16 count)
>  {
>  	dma_addr_t dma;
>  	u16 buffs;
>  	int i;
>  
> -	buffs = xsk_buff_alloc_batch(pool, xdp, count);
> +	buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, count);
>  	for (i = 0; i < buffs; i++) {
>  		dma = xsk_buff_xdp_get_dma(*xdp);
>  		rx_desc->read.pkt_addr = cpu_to_le64(dma);
>  		rx_desc->wb.status_error0 = 0;
>  
> +		/* Put private info that changes on a per-packet basis
> +		 * into xdp_buff_xsk->cb.
> +		 */
> +		ice_xdp_meta_set_desc(*xdp, rx_desc);
> +
>  		rx_desc++;
>  		xdp++;
>  	}
> @@ -488,8 +493,7 @@ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
>  	xdp = ice_xdp_buf(rx_ring, ntu);
>  
>  	if (ntu + count >= rx_ring->count) {
> -		nb_buffs_extra = ice_fill_rx_descs(rx_ring->xsk_pool, xdp,
> -						   rx_desc,
> +		nb_buffs_extra = ice_fill_rx_descs(rx_ring, xdp, rx_desc,
>  						   rx_ring->count - ntu);
>  		if (nb_buffs_extra != rx_ring->count - ntu) {
>  			ntu += nb_buffs_extra;
> @@ -502,7 +506,7 @@ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
>  		ice_release_rx_desc(rx_ring, 0);
>  	}
>  
> -	nb_buffs = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, count);
> +	nb_buffs = ice_fill_rx_descs(rx_ring, xdp, rx_desc, count);
>  
>  	ntu += nb_buffs;
>  	if (ntu == rx_ring->count)
> @@ -752,6 +756,7 @@ 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

leftover comment from previous approach

>   *
>   * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
>   */
> -- 
> 2.41.0
> 

[xdp-hints] Re: [PATCH bpf-next v7 08/18] ice: Support XDP hints in AF_XDP ZC mode

[Larysa Zaremba]

On Thu, Nov 16, 2023 at 01:49:36PM +0100, Maciej Fijalkowski wrote:
> On Wed, Nov 15, 2023 at 06:52:50PM +0100, Larysa Zaremba wrote:
> > In AF_XDP ZC, xdp_buff is not stored on ring,
> > instead it is provided by xsk_buff_pool.
> > Space for metadata sources right after such buffers was already reserved
> > in commit 94ecc5ca4dbf ("xsk: Add cb area to struct xdp_buff_xsk").
> > 
> > Some things (such as pointer to packet context) do not change on a
> > per-packet basis, so they can be set at the same time as RX queue info.
> > On the other hand, RX descriptor is unique for each packet, but is already
> > known when setting DMA addresses. This minimizes performance impact of
> > hints on regular packet processing.
> > 
> > Update AF_XDP ZC packet processing to support XDP hints.
> > 
> > Co-developed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> > Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > ---
> >  drivers/net/ethernet/intel/ice/ice_base.c | 13 +++++++++++++
> >  drivers/net/ethernet/intel/ice/ice_xsk.c  | 17 +++++++++++------
> >  2 files changed, 24 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
> > index 2d83f3c029e7..d3396c1c87a9 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_base.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_base.c
> > @@ -519,6 +519,18 @@ static int ice_setup_rx_ctx(struct ice_rx_ring *ring)
> >  	return 0;
> >  }
> >  
> > +static void ice_xsk_pool_fill_cb(struct ice_rx_ring *ring)
> > +{
> > +	void *ctx_ptr = &ring->pkt_ctx;
> > +	struct xsk_cb_desc desc = {};
> > +
> > +	desc.src = &ctx_ptr;
> > +	desc.off = offsetof(struct ice_xdp_buff, pkt_ctx) -
> > +		   sizeof(struct xdp_buff);
> 
> Took me a while to figure out this offset calculation:D
>

Do you have a suggestion, how to make it easier to understand?
 
> > +	desc.bytes = sizeof(ctx_ptr);
> > +	xsk_pool_fill_cb(ring->xsk_pool, &desc);
> > +}
> > +
> >  /**
> >   * ice_vsi_cfg_rxq - Configure an Rx queue
> >   * @ring: the ring being configured
> > @@ -553,6 +565,7 @@ int ice_vsi_cfg_rxq(struct ice_rx_ring *ring)
> >  			if (err)
> >  				return err;
> >  			xsk_pool_set_rxq_info(ring->xsk_pool, &ring->xdp_rxq);
> 
> A good place for XSK_CHECK_PRIV_TYPE() ?

Seems so, have not noticed that it was missing :(

> 
> > +			ice_xsk_pool_fill_cb(ring);
> >  
> >  			dev_info(dev, "Registered XDP mem model MEM_TYPE_XSK_BUFF_POOL on Rx ring %d\n",
> >  				 ring->q_index);
> > diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
> > index 906e383e864a..a690e34ea8ae 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_xsk.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
> > @@ -433,7 +433,7 @@ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
> >  
> >  /**
> >   * ice_fill_rx_descs - pick buffers from XSK buffer pool and use it
> > - * @pool: XSK Buffer pool to pull the buffers from
> > + * @rx_ring: rx ring
> >   * @xdp: SW ring of xdp_buff that will hold the buffers
> >   * @rx_desc: Pointer to Rx descriptors that will be filled
> >   * @count: The number of buffers to allocate
> > @@ -445,19 +445,24 @@ int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
> >   *
> >   * Returns the amount of allocated Rx descriptors
> >   */
> > -static u16 ice_fill_rx_descs(struct xsk_buff_pool *pool, struct xdp_buff **xdp,
> > +static u16 ice_fill_rx_descs(struct ice_rx_ring *rx_ring, struct xdp_buff **xdp,
> 
> Might be lack of caffeine on my side, but I don't see a reason for passing
> rx_ring down to ice_fill_rx_descs() ?
> 
> I see I introduced this in the code example previously but it must have
> been some leftover from previous hacking...
> 
> Help!

It is lack of caffeine on both sides. I have missed the fact that indeed, we do 
not need rx_ring here.

> 
> >  			     union ice_32b_rx_flex_desc *rx_desc, u16 count)
> >  {
> >  	dma_addr_t dma;
> >  	u16 buffs;
> >  	int i;
> >  
> > -	buffs = xsk_buff_alloc_batch(pool, xdp, count);
> > +	buffs = xsk_buff_alloc_batch(rx_ring->xsk_pool, xdp, count);
> >  	for (i = 0; i < buffs; i++) {
> >  		dma = xsk_buff_xdp_get_dma(*xdp);
> >  		rx_desc->read.pkt_addr = cpu_to_le64(dma);
> >  		rx_desc->wb.status_error0 = 0;
> >  
> > +		/* Put private info that changes on a per-packet basis
> > +		 * into xdp_buff_xsk->cb.
> > +		 */
> > +		ice_xdp_meta_set_desc(*xdp, rx_desc);
> > +
> >  		rx_desc++;
> >  		xdp++;
> >  	}
> > @@ -488,8 +493,7 @@ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
> >  	xdp = ice_xdp_buf(rx_ring, ntu);
> >  
> >  	if (ntu + count >= rx_ring->count) {
> > -		nb_buffs_extra = ice_fill_rx_descs(rx_ring->xsk_pool, xdp,
> > -						   rx_desc,
> > +		nb_buffs_extra = ice_fill_rx_descs(rx_ring, xdp, rx_desc,
> >  						   rx_ring->count - ntu);
> >  		if (nb_buffs_extra != rx_ring->count - ntu) {
> >  			ntu += nb_buffs_extra;
> > @@ -502,7 +506,7 @@ static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
> >  		ice_release_rx_desc(rx_ring, 0);
> >  	}
> >  
> > -	nb_buffs = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, count);
> > +	nb_buffs = ice_fill_rx_descs(rx_ring, xdp, rx_desc, count);
> >  
> >  	ntu += nb_buffs;
> >  	if (ntu == rx_ring->count)
> > @@ -752,6 +756,7 @@ 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
> 
> leftover comment from previous approach
> 

Will fix.

> >   *
> >   * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
> >   */
> > -- 
> > 2.41.0
> > 

[xdp-hints] Re: [PATCH bpf-next v7 08/18] ice: Support XDP hints in AF_XDP ZC mode

[Maciej Fijalkowski]

On Thu, Nov 16, 2023 at 04:01:01AM +0100, Larysa Zaremba wrote:
> On Thu, Nov 16, 2023 at 01:49:36PM +0100, Maciej Fijalkowski wrote:
> > On Wed, Nov 15, 2023 at 06:52:50PM +0100, Larysa Zaremba wrote:
> > > In AF_XDP ZC, xdp_buff is not stored on ring,
> > > instead it is provided by xsk_buff_pool.
> > > Space for metadata sources right after such buffers was already reserved
> > > in commit 94ecc5ca4dbf ("xsk: Add cb area to struct xdp_buff_xsk").
> > > 
> > > Some things (such as pointer to packet context) do not change on a
> > > per-packet basis, so they can be set at the same time as RX queue info.
> > > On the other hand, RX descriptor is unique for each packet, but is already
> > > known when setting DMA addresses. This minimizes performance impact of
> > > hints on regular packet processing.
> > > 
> > > Update AF_XDP ZC packet processing to support XDP hints.
> > > 
> > > Co-developed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> > > Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
> > > Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
> > > ---
> > >  drivers/net/ethernet/intel/ice/ice_base.c | 13 +++++++++++++
> > >  drivers/net/ethernet/intel/ice/ice_xsk.c  | 17 +++++++++++------
> > >  2 files changed, 24 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
> > > index 2d83f3c029e7..d3396c1c87a9 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_base.c
> > > +++ b/drivers/net/ethernet/intel/ice/ice_base.c
> > > @@ -519,6 +519,18 @@ static int ice_setup_rx_ctx(struct ice_rx_ring *ring)
> > >  	return 0;
> > >  }
> > >  
> > > +static void ice_xsk_pool_fill_cb(struct ice_rx_ring *ring)
> > > +{
> > > +	void *ctx_ptr = &ring->pkt_ctx;
> > > +	struct xsk_cb_desc desc = {};
> > > +
> > > +	desc.src = &ctx_ptr;
> > > +	desc.off = offsetof(struct ice_xdp_buff, pkt_ctx) -
> > > +		   sizeof(struct xdp_buff);
> > 
> > Took me a while to figure out this offset calculation:D
> >
> 
> Do you have a suggestion, how to make it easier to understand?
>  

Not really, thought about moving the xdp_buff size subtraction to
xp_fill_cb but that would limit its usage. Let us keep it this way, I was
just probably being slow.

[xdp-hints] [PATCH bpf-next v7 09/18] xdp: Add VLAN tag hint

[Larysa Zaremba]

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

VLAN tag is represented by 2 variables:
- protocol ID, which is passed to bpf code in BE
- VLAN TCI, in host byte order

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 Documentation/netlink/specs/netdev.yaml      |  4 +++
 Documentation/networking/xdp-rx-metadata.rst |  8 ++++-
 include/net/xdp.h                            |  6 ++++
 include/uapi/linux/netdev.h                  |  5 ++-
 net/core/xdp.c                               | 33 ++++++++++++++++++++
 tools/include/uapi/linux/netdev.h            |  5 ++-
 tools/net/ynl/generated/netdev-user.c        |  1 +
 7 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/Documentation/netlink/specs/netdev.yaml b/Documentation/netlink/specs/netdev.yaml
index 14511b13f305..32d619285c5e 100644
--- a/Documentation/netlink/specs/netdev.yaml
+++ b/Documentation/netlink/specs/netdev.yaml
@@ -55,6 +55,10 @@ definitions:
         name: hash
         doc:
           Device is capable of exposing receive packet hash via bpf_xdp_metadata_rx_hash().
+      -
+        name: vlan-tag
+        doc:
+          Device is capable of exposing receive packet VLAN tag via bpf_xdp_metadata_rx_vlan_tag().
 
 attribute-sets:
   -
diff --git a/Documentation/networking/xdp-rx-metadata.rst b/Documentation/networking/xdp-rx-metadata.rst
index 205696780b78..bb53b00d1b2c 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/net/xdp.h b/include/net/xdp.h
index eb77040b4825..ef79f124dbcf 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -399,6 +399,10 @@ void xdp_attachment_setup(struct xdp_attachment_info *info,
 			   NETDEV_XDP_RX_METADATA_HASH, \
 			   bpf_xdp_metadata_rx_hash, \
 			   xmo_rx_hash) \
+	XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_VLAN_TAG, \
+			   NETDEV_XDP_RX_METADATA_VLAN_TAG, \
+			   bpf_xdp_metadata_rx_vlan_tag, \
+			   xmo_rx_vlan_tag) \
 
 enum xdp_rx_metadata {
 #define XDP_METADATA_KFUNC(name, _, __, ___) name,
@@ -460,6 +464,8 @@ 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, __be16 *vlan_proto,
+				   u16 *vlan_tci);
 };
 
 #ifdef CONFIG_NET
diff --git a/include/uapi/linux/netdev.h b/include/uapi/linux/netdev.h
index 2943a151d4f1..5437226d940d 100644
--- a/include/uapi/linux/netdev.h
+++ b/include/uapi/linux/netdev.h
@@ -44,13 +44,16 @@ enum netdev_xdp_act {
  *   timestamp via bpf_xdp_metadata_rx_timestamp().
  * @NETDEV_XDP_RX_METADATA_HASH: Device is capable of exposing receive packet
  *   hash via bpf_xdp_metadata_rx_hash().
+ * @NETDEV_XDP_RX_METADATA_VLAN_TAG: Device is capable of exposing receive
+ *   packet VLAN tag via bpf_xdp_metadata_rx_vlan_tag().
  */
 enum netdev_xdp_rx_metadata {
 	NETDEV_XDP_RX_METADATA_TIMESTAMP = 1,
 	NETDEV_XDP_RX_METADATA_HASH = 2,
+	NETDEV_XDP_RX_METADATA_VLAN_TAG = 4,
 
 	/* private: */
-	NETDEV_XDP_RX_METADATA_MASK = 3,
+	NETDEV_XDP_RX_METADATA_MASK = 7,
 };
 
 enum {
diff --git a/net/core/xdp.c b/net/core/xdp.c
index b6f1d6dab3f2..4869c1c2d8f3 100644
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -736,6 +736,39 @@ __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_proto: Destination pointer for VLAN Tag protocol identifier (TPID).
+ * @vlan_tci: Destination pointer for VLAN TCI (VID + DEI + PCP)
+ *
+ * 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,
+					     __be16 *vlan_proto, u16 *vlan_tci)
+{
+	return -EOPNOTSUPP;
+}
+
 __bpf_kfunc_end_defs();
 
 BTF_SET8_START(xdp_metadata_kfunc_ids)
diff --git a/tools/include/uapi/linux/netdev.h b/tools/include/uapi/linux/netdev.h
index 2943a151d4f1..5437226d940d 100644
--- a/tools/include/uapi/linux/netdev.h
+++ b/tools/include/uapi/linux/netdev.h
@@ -44,13 +44,16 @@ enum netdev_xdp_act {
  *   timestamp via bpf_xdp_metadata_rx_timestamp().
  * @NETDEV_XDP_RX_METADATA_HASH: Device is capable of exposing receive packet
  *   hash via bpf_xdp_metadata_rx_hash().
+ * @NETDEV_XDP_RX_METADATA_VLAN_TAG: Device is capable of exposing receive
+ *   packet VLAN tag via bpf_xdp_metadata_rx_vlan_tag().
  */
 enum netdev_xdp_rx_metadata {
 	NETDEV_XDP_RX_METADATA_TIMESTAMP = 1,
 	NETDEV_XDP_RX_METADATA_HASH = 2,
+	NETDEV_XDP_RX_METADATA_VLAN_TAG = 4,
 
 	/* private: */
-	NETDEV_XDP_RX_METADATA_MASK = 3,
+	NETDEV_XDP_RX_METADATA_MASK = 7,
 };
 
 enum {
diff --git a/tools/net/ynl/generated/netdev-user.c b/tools/net/ynl/generated/netdev-user.c
index b5ffe8cd1144..4e6eb2c7baa4 100644
--- a/tools/net/ynl/generated/netdev-user.c
+++ b/tools/net/ynl/generated/netdev-user.c
@@ -48,6 +48,7 @@ const char *netdev_xdp_act_str(enum netdev_xdp_act value)
 static const char * const netdev_xdp_rx_metadata_strmap[] = {
 	[0] = "timestamp",
 	[1] = "hash",
+	[2] = "vlan-tag",
 };
 
 const char *netdev_xdp_rx_metadata_str(enum netdev_xdp_rx_metadata value)
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v7 10/18] 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 often refers to VLAN proto and VLAN TCI combined,
while in the code we clearly store only VLAN TCI.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c     | 20 ++++++++++++++
 drivers/net/ethernet/intel/ice/ice_txrx.c     |  6 ++---
 drivers/net/ethernet/intel/ice/ice_txrx.h     |  6 ++++-
 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, 59 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index cfb6beadcc60..485c561c129c 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6041,6 +6041,23 @@ 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
@@ -6083,6 +6100,9 @@ ice_set_vlan_offload_features(struct ice_vsi *vsi, netdev_features_t features)
 	if (strip_err || insert_err)
 		return -EIO;
 
+	ice_set_rx_rings_vlan_proto(vsi, enable_stripping ?
+				    htons(vlan_ethertype) : 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 3d77c058c6de..886ac8450e78 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 {
 	u64 cached_phctime;
+	__be16 vlan_proto;
 };
 
 struct ice_xdp_buff {
@@ -335,7 +336,10 @@ struct ice_rx_ring {
 	/* CL3 - 3rd cacheline starts here */
 	union {
 		struct ice_pkt_ctx pkt_ctx;
-		u64 cached_phctime;
+		struct {
+			u64 cached_phctime;
+			__be16 vlan_proto;
+		};
 	};
 	struct bpf_prog *xdp_prog;
 	u16 rx_offset;
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
index 26a2c218e96d..63bf9f882363 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -601,7 +601,33 @@ 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_proto: destination address for VLAN protocol
+ * @vlan_tci: destination address for VLAN TCI
+ *
+ * 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, __be16 *vlan_proto,
+			       u16 *vlan_tci)
+{
+	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->eop_desc);
+	if (!*vlan_tci)
+		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 81b8856d8e13..3893af1c11f3 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 a690e34ea8ae..aeaf6692696e 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -868,7 +868,7 @@ 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, ntc);
 
@@ -946,10 +946,10 @@ 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);
 	}
 
 	rx_ring->next_to_clean = ntc;
-- 
2.41.0

[xdp-hints] Re: [PATCH bpf-next v7 10/18] ice: Implement VLAN tag hint

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:52PM +0100, Larysa Zaremba wrote:
> 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 often refers to VLAN proto and VLAN TCI combined,
> while in the code we clearly store only VLAN TCI.
> 
> Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> ---
>  drivers/net/ethernet/intel/ice/ice_main.c     | 20 ++++++++++++++
>  drivers/net/ethernet/intel/ice/ice_txrx.c     |  6 ++---
>  drivers/net/ethernet/intel/ice/ice_txrx.h     |  6 ++++-
>  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, 59 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> index cfb6beadcc60..485c561c129c 100644
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -6041,6 +6041,23 @@ 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
> @@ -6083,6 +6100,9 @@ ice_set_vlan_offload_features(struct ice_vsi *vsi, netdev_features_t features)
>  	if (strip_err || insert_err)
>  		return -EIO;
>  
> +	ice_set_rx_rings_vlan_proto(vsi, enable_stripping ?
> +				    htons(vlan_ethertype) : 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 3d77c058c6de..886ac8450e78 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 {
>  	u64 cached_phctime;
> +	__be16 vlan_proto;
>  };
>  
>  struct ice_xdp_buff {
> @@ -335,7 +336,10 @@ struct ice_rx_ring {
>  	/* CL3 - 3rd cacheline starts here */
>  	union {
>  		struct ice_pkt_ctx pkt_ctx;
> -		u64 cached_phctime;
> +		struct {
> +			u64 cached_phctime;
> +			__be16 vlan_proto;
> +		};
>  	};
>  	struct bpf_prog *xdp_prog;
>  	u16 rx_offset;
> diff --git a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> index 26a2c218e96d..63bf9f882363 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -601,7 +601,33 @@ 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_proto: destination address for VLAN protocol
> + * @vlan_tci: destination address for VLAN TCI
> + *
> + * 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, __be16 *vlan_proto,
> +			       u16 *vlan_tci)
> +{
> +	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->eop_desc);
> +	if (!*vlan_tci)
> +		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 81b8856d8e13..3893af1c11f3 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 a690e34ea8ae..aeaf6692696e 100644
> --- a/drivers/net/ethernet/intel/ice/ice_xsk.c
> +++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
> @@ -868,7 +868,7 @@ 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, ntc);
>  
> @@ -946,10 +946,10 @@ 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);
>  	}
>  
>  	rx_ring->next_to_clean = ntc;
> -- 
> 2.41.0
> 

[xdp-hints] [PATCH bpf-next v7 11/18] 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 often refers to VLAN proto and VLAN TCI combined,
while in the code we clearly store only VLAN TCI.

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 63bf9f882363..a1f5243299c5 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
@@ -246,21 +246,17 @@ 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->vlan_proto)
+		__vlan_hwaccel_put_tag(skb, rx_ring->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 3893af1c11f3..762047508619 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] Re: [PATCH bpf-next v7 11/18] ice: use VLAN proto from ring packet context in skb path

[Maciej Fijalkowski]

On Wed, Nov 15, 2023 at 06:52:53PM +0100, Larysa Zaremba wrote:
> 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 often refers to VLAN proto and VLAN TCI combined,
> while in the code we clearly store only VLAN TCI.
> 
> 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 63bf9f882363..a1f5243299c5 100644
> --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> @@ -246,21 +246,17 @@ 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->vlan_proto)
> +		__vlan_hwaccel_put_tag(skb, rx_ring->vlan_proto,

Umm... 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 3893af1c11f3..762047508619 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] Re: [PATCH bpf-next v7 11/18] ice: use VLAN proto from ring packet context in skb path

[Larysa Zaremba]

On Fri, Nov 17, 2023 at 09:10:44AM +0100, Maciej Fijalkowski wrote:
> On Wed, Nov 15, 2023 at 06:52:53PM +0100, Larysa Zaremba wrote:
> > 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 often refers to VLAN proto and VLAN TCI combined,
> > while in the code we clearly store only VLAN TCI.
> > 
> > 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 63bf9f882363..a1f5243299c5 100644
> > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > @@ -246,21 +246,17 @@ 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->vlan_proto)
> > +		__vlan_hwaccel_put_tag(skb, rx_ring->vlan_proto,
> 
> Umm... pkt_ctx.vlan_proto ?
> 

This compiles both ways. I have put pkt_ctx into a union.

> > +				       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 3893af1c11f3..762047508619 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] Re: [PATCH bpf-next v7 11/18] ice: use VLAN proto from ring packet context in skb path

[Maciej Fijalkowski]

On Fri, Nov 17, 2023 at 03:07:37PM +0100, Larysa Zaremba wrote:
> On Fri, Nov 17, 2023 at 09:10:44AM +0100, Maciej Fijalkowski wrote:
> > On Wed, Nov 15, 2023 at 06:52:53PM +0100, Larysa Zaremba wrote:
> > > 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 often refers to VLAN proto and VLAN TCI combined,
> > > while in the code we clearly store only VLAN TCI.
> > > 
> > > 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 63bf9f882363..a1f5243299c5 100644
> > > --- a/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > +++ b/drivers/net/ethernet/intel/ice/ice_txrx_lib.c
> > > @@ -246,21 +246,17 @@ 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->vlan_proto)
> > > +		__vlan_hwaccel_put_tag(skb, rx_ring->vlan_proto,
> > 
> > Umm... pkt_ctx.vlan_proto ?
> > 
> 
> This compiles both ways. I have put pkt_ctx into a union.

Right, missed that.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

> 
> > > +				       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 3893af1c11f3..762047508619 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 v7 12/18] veth: Implement VLAN tag XDP hint

[Larysa Zaremba]

In order to test VLAN tag hint in hardware-independent selftests, implement
newly added hint in veth driver.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/veth.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 9980517ed8b0..b6617784e7d3 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1743,6 +1743,24 @@ 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, __be16 *vlan_proto,
+				u16 *vlan_tci)
+{
+	const struct veth_xdp_buff *_ctx = (void *)ctx;
+	const 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 const struct net_device_ops veth_netdev_ops = {
 	.ndo_init            = veth_dev_init,
 	.ndo_open            = veth_open,
@@ -1767,6 +1785,7 @@ 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,
 };
 
 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v7 13/18] 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>
Acked-by: Stanislav Fomichev <sdf@google.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 3028af87716e..c1645c86eed9 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 v7 14/18] mlx5: implement VLAN tag XDP hint

[Larysa Zaremba]

Implement the newly added .xmo_rx_vlan_tag() hint function.

Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c | 15 +++++++++++++++
 include/linux/mlx5/device.h                      |  2 +-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
index 7decc81ed33a..9a9f78d1c6c7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c
@@ -256,9 +256,24 @@ static int mlx5e_xdp_rx_hash(const struct xdp_md *ctx, u32 *hash,
 	return 0;
 }
 
+static int mlx5e_xdp_rx_vlan_tag(const struct xdp_md *ctx, __be16 *vlan_proto,
+				 u16 *vlan_tci)
+{
+	const struct mlx5e_xdp_buff *_ctx = (void *)ctx;
+	const struct mlx5_cqe64 *cqe = _ctx->cqe;
+
+	if (!cqe_has_vlan(cqe))
+		return -ENODATA;
+
+	*vlan_proto = htons(ETH_P_8021Q);
+	*vlan_tci = be16_to_cpu(cqe->vlan_info);
+	return 0;
+}
+
 const struct xdp_metadata_ops mlx5e_xdp_metadata_ops = {
 	.xmo_rx_timestamp		= mlx5e_xdp_rx_timestamp,
 	.xmo_rx_hash			= mlx5e_xdp_rx_hash,
+	.xmo_rx_vlan_tag		= mlx5e_xdp_rx_vlan_tag,
 };
 
 /* returns true if packet was consumed by xdp */
diff --git a/include/linux/mlx5/device.h b/include/linux/mlx5/device.h
index 820bca965fb6..01275c6e8468 100644
--- a/include/linux/mlx5/device.h
+++ b/include/linux/mlx5/device.h
@@ -918,7 +918,7 @@ static inline u8 get_cqe_tls_offload(struct mlx5_cqe64 *cqe)
 	return (cqe->tls_outer_l3_tunneled >> 3) & 0x3;
 }
 
-static inline bool cqe_has_vlan(struct mlx5_cqe64 *cqe)
+static inline bool cqe_has_vlan(const struct mlx5_cqe64 *cqe)
 {
 	return cqe->l4_l3_hdr_type & 0x1;
 }
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v7 15/18] 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.

Acked-by: Stanislav Fomichev <sdf@google.com>
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 f6d1cc9ad892..8767d919c881 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 v7 16/18] selftests/bpf: Add flags and VLAN hint to xdp_hw_metadata

[Larysa Zaremba]

Add VLAN hint 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.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../selftests/bpf/progs/xdp_hw_metadata.c     | 28 +++++++++++---
 tools/testing/selftests/bpf/xdp_hw_metadata.c | 38 ++++++++++++++++---
 tools/testing/selftests/bpf/xdp_metadata.h    | 26 ++++++++++++-
 3 files changed, 79 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
index 8767d919c881..330ece2eabdb 100644
--- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
+++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
@@ -20,6 +20,9 @@ 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,
+					__be16 *vlan_proto,
+					__u16 *vlan_tci) __ksym;
 
 SEC("xdp.frags")
 int rx(struct xdp_md *ctx)
@@ -84,15 +87,28 @@ int rx(struct xdp_md *ctx)
 		return XDP_PASS;
 	}
 
+	meta->hint_valid = 0;
+
+	meta->xdp_timestamp = bpf_ktime_get_tai_ns();
 	err = bpf_xdp_metadata_rx_timestamp(ctx, &meta->rx_timestamp);
-	if (!err)
-		meta->xdp_timestamp = bpf_ktime_get_tai_ns();
+	if (err)
+		meta->rx_timestamp_err = err;
+	else
+		meta->hint_valid |= XDP_META_FIELD_TS;
+
+	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_proto,
+					   &meta->rx_vlan_tci);
+	if (err)
+		meta->rx_vlan_tag_err = err;
+	else
+		meta->hint_valid |= XDP_META_FIELD_VLAN_TAG;
 
 	__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 c3ba40d0b9de..141dea82c46c 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>
@@ -152,21 +155,34 @@ 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);
+}
+
 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;
@@ -181,8 +197,18 @@ 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);
+	}
 }
 
 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..87318ad1117a 100644
--- a/tools/testing/selftests/bpf/xdp_metadata.h
+++ b/tools/testing/selftests/bpf/xdp_metadata.h
@@ -17,12 +17,36 @@
 #define ETH_P_8021AD 0x88A8
 #endif
 
+#ifndef BIT
+#define BIT(nr)			(1 << (nr))
+#endif
+
+/* Non-existent checksum status */
+#define XDP_CHECKSUM_MAGIC	BIT(2)
+
+enum xdp_meta_field {
+	XDP_META_FIELD_TS	= BIT(0),
+	XDP_META_FIELD_RSS	= BIT(1),
+	XDP_META_FIELD_VLAN_TAG	= BIT(2),
+};
+
 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 {
+			__be16 rx_vlan_proto;
+			__u16 rx_vlan_tci;
+		};
+		__s32 rx_vlan_tag_err;
+	};
+	enum xdp_meta_field hint_valid;
 };
-- 
2.41.0

[xdp-hints] [PATCH bpf-next v7 17/18] 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.

Acked-by: Stanislav Fomichev <sdf@google.com>
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 4439ba9392f8..4fcdda02c75e 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 v7 17/18] selftests/bpf: Use AF_INET for TX in xdp_metadata

[Stanislav Fomichev]

On 11/15, 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.

Btw, I've been thinking a bit about how we can make this test work for both
your VLANs and my upcoming af_xdp tx side. And seems like the best
way, probably, is to have two tx paths exercised: veth and af_xdp.
For veth, we'll verify everything+vlans, for af_xdp we'll verify
everything except the vlans.

Originally I was assuming that I'll switch this part back to af_xdp, but
I don't think having tx vlan offload makes sense (because af_xdp
userspace can just prepare the correct header from the start).

So if you're doing a respin, maybe see if we can keep af_xdp tx part
but make it skip the vlans verification?

generate_packet_af_xdp();
verify_xsk_metadata(/*verify_vlans=*/false);
geenrate_packet_veth();
verify_xsk_metadata(/*verify_vlans=*/true);

?

[xdp-hints] Re: [PATCH bpf-next v7 17/18] selftests/bpf: Use AF_INET for TX in xdp_metadata

[Larysa Zaremba]

On Mon, Nov 20, 2023 at 01:15:41PM -0800, Stanislav Fomichev via xdp-hints wrote:
> Date: Mon, 20 Nov 2023 13:15:41 -0800
> From: Stanislav Fomichev <sdf@google.com>
> To: Larysa Zaremba <larysa.zaremba@intel.com>
> CC: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
>  andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
>  john.fastabend@gmail.com, kpsingh@kernel.org, haoluo@google.com,
>  jolsa@kernel.org, David Ahern <dsahern@gmail.com>, Jakub Kicinski
>  <kuba@kernel.org>, Willem de Bruijn <willemb@google.com>, Jesper Dangaard
>  Brouer <hawk@kernel.org>, Anatoly Burakov <anatoly.burakov@intel.com>,
>  Alexander Lobakin <alexandr.lobakin@intel.com>, Magnus Karlsson
>  <magnus.karlsson@gmail.com>, Maryam Tahhan <mtahhan@redhat.com>,
>  xdp-hints@xdp-project.net, netdev@vger.kernel.org, Willem de Bruijn
>  <willemdebruijn.kernel@gmail.com>, Alexei Starovoitov
>  <alexei.starovoitov@gmail.com>, Tariq Toukan <tariqt@mellanox.com>, Saeed
>  Mahameed <saeedm@mellanox.com>, Maciej Fijalkowski
>  <maciej.fijalkowski@intel.com>
> Subject: [xdp-hints] Re: [PATCH bpf-next v7 17/18] selftests/bpf: Use
>  AF_INET for TX in xdp_metadata
> 
> On 11/15, 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.
> 
> Btw, I've been thinking a bit about how we can make this test work for both
> your VLANs and my upcoming af_xdp tx side. And seems like the best
> way, probably, is to have two tx paths exercised: veth and af_xdp.
> For veth, we'll verify everything+vlans, for af_xdp we'll verify
> everything except the vlans.
> 
> Originally I was assuming that I'll switch this part back to af_xdp, but
> I don't think having tx vlan offload makes sense (because af_xdp
> userspace can just prepare the correct header from the start).
> 
> So if you're doing a respin, maybe see if we can keep af_xdp tx part
> but make it skip the vlans verification?
> 
> generate_packet_af_xdp();
> verify_xsk_metadata(/*verify_vlans=*/false);
> geenrate_packet_veth();
> verify_xsk_metadata(/*verify_vlans=*/true);
> 
> ?

Sounds good to me, will do so.

[xdp-hints] [PATCH bpf-next v7 18/18] 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.

Also, add TO_STR() macro for convenience.

Acked-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 .../selftests/bpf/prog_tests/xdp_metadata.c   | 21 +++++++++++++++++--
 .../selftests/bpf/progs/xdp_metadata.c        |  5 +++++
 tools/testing/selftests/bpf/testing_helpers.h |  3 +++
 3 files changed, 27 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 4fcdda02c75e..21b8e0e95019 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_metadata.c
@@ -38,7 +38,14 @@
 #define TX_MAC "00:00:00:00:00:01"
 #define RX_MAC "00:00:00:00:00:02"
 
+#define VLAN_ID 59
+#define VLAN_PROTO "802.1Q"
+#define VLAN_PID htons(ETH_P_8021Q)
+#define TX_NAME_VLAN TX_NAME "." TO_STR(VLAN_ID)
+#define RX_NAME_VLAN RX_NAME "." TO_STR(VLAN_ID)
+
 #define XDP_RSS_TYPE_L4 BIT(3)
+#define VLAN_VID_MASK 0xfff
 
 struct xsk {
 	void *umem_area;
@@ -215,6 +222,12 @@ 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 +261,14 @@ 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 " TO_STR(VLAN_ID));
+	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..2c6c46ef8502 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,
+					__be16 *vlan_proto,
+					__u16 *vlan_tci) __ksym;
 
 SEC("xdp")
 int rx(struct xdp_md *ctx)
@@ -57,6 +60,8 @@ 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_proto,
+				     &meta->rx_vlan_tci);
 
 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
 }
diff --git a/tools/testing/selftests/bpf/testing_helpers.h b/tools/testing/selftests/bpf/testing_helpers.h
index 5b7a55136741..35284faff4f2 100644
--- a/tools/testing/selftests/bpf/testing_helpers.h
+++ b/tools/testing/selftests/bpf/testing_helpers.h
@@ -9,6 +9,9 @@
 #include <bpf/libbpf.h>
 #include <time.h>
 
+#define __TO_STR(x) #x
+#define TO_STR(x) __TO_STR(x)
+
 int parse_num_list(const char *s, bool **set, int *set_len);
 __u32 link_info_prog_id(const struct bpf_link *link, struct bpf_link_info *info);
 int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
-- 
2.41.0