linux-kernel - [PATCH bpf-next 8/9] veth: use napi_skb_cache_get_bulk() instead of xdp_alloc_skb

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Message-ID: <20240830162508.1009458-9-aleksander.lobakin@intel.com>
Date: Fri, 30 Aug 2024 18:25:07 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Daniel Xu <dxu@...uu.xyz>,
	John Fastabend <john.fastabend@...il.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next 8/9] veth: use napi_skb_cache_get_bulk() instead of xdp_alloc_skb_bulk()

Now that we can bulk-allocate skbs from the NAPI cache, use that
function to do that in veth as well instead of direct allocation from
the kmem caches. veth already uses NAPI for Rx processing, so this is
safe from the context perspective. veth also uses GRO, so using NAPI
caches makes real difference here.

Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
 drivers/net/veth.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 18148e068aa0..774f226666c8 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -684,8 +684,7 @@ static void veth_xdp_rcv_bulk_skb(struct veth_rq *rq, void **frames,
 	void *skbs[VETH_XDP_BATCH];
 	int i;
 
-	if (xdp_alloc_skb_bulk(skbs, n_xdpf,
-			       GFP_ATOMIC | __GFP_ZERO) < 0) {
+	if (unlikely(!napi_skb_cache_get_bulk(skbs, n_xdpf))) {
 		for (i = 0; i < n_xdpf; i++)
 			xdp_return_frame(frames[i]);
 		stats->rx_drops += n_xdpf;
-- 
2.46.0