netdev - [net-next V2 1/9] net/mlx5e: Switch to using napi_build

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Date:   Sat, 18 Feb 2023 01:05:05 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Gal Pressman <gal@...dia.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Alexander Lobakin <aleksander.lobakin@...el.com>
Subject: [net-next V2 1/9] net/mlx5e: Switch to using napi_build_skb()

From: Tariq Toukan <tariqt@...dia.com>

Use napi_build_skb() which uses NAPI percpu caches to obtain
skbuff_head instead of inplace allocation.

napi_build_skb() calls napi_skb_cache_get(), which returns a cached
skb, or allocates a bulk of NAPI_SKB_CACHE_BULK (16) if cache is empty.

Performance test:
TCP single stream, single ring, single core, default MTU (1500B).

Before: 26.5 Gbits/sec
After:  30.1 Gbits/sec (+13.6%)

Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Gal Pressman <gal@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
index b2c7ec4692f0..0af02cc0d5ad 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
@@ -1556,7 +1556,7 @@ struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
 				       u32 frag_size, u16 headroom,
 				       u32 cqe_bcnt, u32 metasize)
 {
-	struct sk_buff *skb = build_skb(va, frag_size);
+	struct sk_buff *skb = napi_build_skb(va, frag_size);
 
 	if (unlikely(!skb)) {
 		rq->stats->buff_alloc_err++;
-- 
2.39.1