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net: advance skb_defer_disable_key check in napi_consume_skb

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When net.core.skb_defer_max is adjusted to zero, napi_consume_skb()
shouldn't go into that deeper in skb_attempt_defer_free() because it adds
an additional pair of local_bh_enable/disable() which is evidently not
needed. Advancing the check of the static key saves more cycles and
benefits non defer case.

Signed-off-by: Jason Xing <kernelxing@tencent.com>
Link: https://patch.msgid.link/20260402034114.65766-1-kerneljasonxing@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jason Xing 2026-04-02 11:41:14 +08:00 committed by Jakub Kicinski
parent 1ef05ed263
commit 8a4e3ab61d
1 changed files with 3 additions and 1 deletions
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4
net/core/skbuff.c
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@ -94,6 +94,7 @@
#include "dev.h"
#include "devmem.h"
#include "net-sysfs.h"
#include "netmem_priv.h"
#include "sock_destructor.h"
@ -1519,7 +1520,8 @@ void napi_consume_skb(struct sk_buff *skb, int budget)
DEBUG_NET_WARN_ON_ONCE(!in_softirq());
if (skb->alloc_cpu != smp_processor_id() && !skb_shared(skb)) {
if (!static_branch_unlikely(&skb_defer_disable_key) &&
skb->alloc_cpu != smp_processor_id() && !skb_shared(skb)) {
skb_release_head_state(skb);
return skb_attempt_defer_free(skb);
}