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From: Larysa Zaremba <larysa.zaremba@intel.com>
To: bpf@vger.kernel.org
Cc: Larysa Zaremba <larysa.zaremba@intel.com>,
	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, sdf@google.com,
	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>,
	Simon Horman <simon.horman@corigine.com>,
	Tariq Toukan <tariqt@mellanox.com>,
	Saeed Mahameed <saeedm@mellanox.com>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Subject: [xdp-hints] [PATCH bpf-next v6 11/18] ice: put XDP meta sources assignment under a static key condition
Date: Thu, 12 Oct 2023 19:05:17 +0200	[thread overview]
Message-ID: <20231012170524.21085-12-larysa.zaremba@intel.com> (raw)
In-Reply-To: <20231012170524.21085-1-larysa.zaremba@intel.com>

Usage of XDP hints requires putting additional information after the
xdp_buff. In basic case, only the descriptor has to be copied on a
per-packet basis, because xdp_buff permanently resides before per-ring
metadata (cached time and VLAN protocol ID).

However, in ZC mode, xdp_buffs come from a pool, so memory after such
buffer does not contain any reliable information, so everything has to be
copied, damaging the performance.

Introduce a static key to enable meta sources assignment only when attached
XDP program is device-bound.

This patch eliminates a 6% performance drop in ZC mode, which was a result
of addition of XDP hints to the driver.

Signed-off-by: Larysa Zaremba <larysa.zaremba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice.h      |  1 +
 drivers/net/ethernet/intel/ice/ice_main.c | 14 ++++++++++++++
 drivers/net/ethernet/intel/ice/ice_txrx.c |  3 ++-
 drivers/net/ethernet/intel/ice/ice_xsk.c  |  3 +++
 4 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index 3d0f15f8b2b8..76d22be878a4 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -210,6 +210,7 @@ enum ice_feature {
 };
 
 DECLARE_STATIC_KEY_FALSE(ice_xdp_locking_key);
+DECLARE_STATIC_KEY_FALSE(ice_xdp_meta_key);
 
 struct ice_channel {
 	struct list_head list;
diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 47e8920e1727..ee0df86d34b7 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -48,6 +48,9 @@ MODULE_PARM_DESC(debug, "netif level (0=none,...,16=all)");
 DEFINE_STATIC_KEY_FALSE(ice_xdp_locking_key);
 EXPORT_SYMBOL(ice_xdp_locking_key);
 
+DEFINE_STATIC_KEY_FALSE(ice_xdp_meta_key);
+EXPORT_SYMBOL(ice_xdp_meta_key);
+
 /**
  * ice_hw_to_dev - Get device pointer from the hardware structure
  * @hw: pointer to the device HW structure
@@ -2634,6 +2637,11 @@ static int ice_xdp_alloc_setup_rings(struct ice_vsi *vsi)
 	return -ENOMEM;
 }
 
+static bool ice_xdp_prog_has_meta(struct bpf_prog *prog)
+{
+	return prog && prog->aux->dev_bound;
+}
+
 /**
  * ice_vsi_assign_bpf_prog - set or clear bpf prog pointer on VSI
  * @vsi: VSI to set the bpf prog on
@@ -2644,10 +2652,16 @@ static void ice_vsi_assign_bpf_prog(struct ice_vsi *vsi, struct bpf_prog *prog)
 	struct bpf_prog *old_prog;
 	int i;
 
+	if (ice_xdp_prog_has_meta(prog))
+		static_branch_inc(&ice_xdp_meta_key);
+
 	old_prog = xchg(&vsi->xdp_prog, prog);
 	ice_for_each_rxq(vsi, i)
 		WRITE_ONCE(vsi->rx_rings[i]->xdp_prog, vsi->xdp_prog);
 
+	if (ice_xdp_prog_has_meta(old_prog))
+		static_branch_dec(&ice_xdp_meta_key);
+
 	if (old_prog)
 		bpf_prog_put(old_prog);
 }
diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 4fd7614f243d..19fc182d1f4c 100644
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -572,7 +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);
+	if (static_branch_unlikely(&ice_xdp_meta_key))
+		ice_xdp_meta_set_desc(xdp, eop_desc);
 
 	act = bpf_prog_run_xdp(xdp_prog, xdp);
 	switch (act) {
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 39775bb6cec1..f92d7d33fde6 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -773,6 +773,9 @@ static void ice_prepare_pkt_ctx_zc(struct xdp_buff *xdp,
 				   union ice_32b_rx_flex_desc *eop_desc,
 				   struct ice_rx_ring *rx_ring)
 {
+	if (!static_branch_unlikely(&ice_xdp_meta_key))
+		return;
+
 	XSK_CHECK_PRIV_TYPE(struct ice_xdp_buff);
 	((struct ice_xdp_buff *)xdp)->pkt_ctx = rx_ring->pkt_ctx;
 	ice_xdp_meta_set_desc(xdp, eop_desc);
-- 
2.41.0


  parent reply	other threads:[~2023-10-12 17:12 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-12 17:05 [xdp-hints] [PATCH bpf-next v6 00/18] XDP metadata via kfuncs for ice + VLAN hint Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 01/18] ice: make RX hash reading code more reusable Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 02/18] ice: make RX HW timestamp " Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 03/18] ice: Make ptype internal to descriptor info processing Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 04/18] ice: Introduce ice_xdp_buff Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 05/18] ice: Support HW timestamp hint Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 06/18] ice: Support RX hash XDP hint Larysa Zaremba
2023-10-20 15:27   ` [xdp-hints] " Maciej Fijalkowski
2023-10-23 10:04     ` Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 07/18] ice: Support XDP hints in AF_XDP ZC mode Larysa Zaremba
2023-10-17 16:13   ` [xdp-hints] " Maciej Fijalkowski
2023-10-17 16:37     ` Magnus Karlsson
2023-10-17 16:45       ` Maciej Fijalkowski
2023-10-17 17:03         ` Larysa Zaremba
2023-10-18 10:43           ` Maciej Fijalkowski
2023-10-20 15:29   ` Maciej Fijalkowski
2023-10-23  9:37     ` Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 08/18] xdp: Add VLAN tag hint Larysa Zaremba
2023-10-18 23:59   ` [xdp-hints] " Jakub Kicinski
2023-10-19  8:05     ` Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 09/18] ice: Implement " Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 10/18] ice: use VLAN proto from ring packet context in skb path Larysa Zaremba
2023-10-12 17:05 ` Larysa Zaremba [this message]
2023-10-20 16:32   ` [xdp-hints] Re: [PATCH bpf-next v6 11/18] ice: put XDP meta sources assignment under a static key condition Maciej Fijalkowski
2023-10-23  9:35     ` Larysa Zaremba
2023-10-28 19:55       ` Maciej Fijalkowski
2023-10-31 14:22         ` Larysa Zaremba
2023-11-02 13:23           ` Maciej Fijalkowski
2023-11-02 13:48             ` Larysa Zaremba
2023-10-31 17:32         ` Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 12/18] veth: Implement VLAN tag XDP hint Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 13/18] net: make vlan_get_tag() return -ENODATA instead of -EINVAL Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 14/18] mlx5: implement VLAN tag XDP hint Larysa Zaremba
2023-10-17 12:40   ` [xdp-hints] " Tariq Toukan
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 15/18] selftests/bpf: Allow VLAN packets in xdp_hw_metadata Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 16/18] selftests/bpf: Add flags and VLAN hint to xdp_hw_metadata Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 17/18] selftests/bpf: Use AF_INET for TX in xdp_metadata Larysa Zaremba
2023-10-12 17:05 ` [xdp-hints] [PATCH bpf-next v6 18/18] selftests/bpf: Check VLAN tag and proto " Larysa Zaremba

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