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net: do not delay zero-copy skbs in skb_attempt_defer_free() 

After the blamed commit, TCP tx zero copy notifications could be
arbitrarily delayed and cause regressions in applications waiting
for them.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: e20dfbad8a ("net: fix napi_consume_skb() with alien skbs")
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20260216193653.627617-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-02-16 19:36:53 +00:00 committed by Jakub Kicinski
parent 6e980df452
commit 0943404b1f
1 changed files with 6 additions and 1 deletions
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7
net/core/skbuff.c
View File

@ -7266,10 +7266,15 @@ void skb_attempt_defer_free(struct sk_buff *skb)
{
struct skb_defer_node *sdn;
unsigned long defer_count;
int cpu = skb->alloc_cpu;
unsigned int defer_max;
bool kick;
int cpu;
/* zero copy notifications should not be delayed. */
if (skb_zcopy(skb))
goto nodefer;
cpu = skb->alloc_cpu;
if (cpu == raw_smp_processor_id() ||
WARN_ON_ONCE(cpu >= nr_cpu_ids) ||
!cpu_online(cpu)) {