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net: sock_dequeue_err_skb() optimization

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Exit early if the list is empty.

Some applications using TCP zerocopy are calling
recvmsg( ... MSG_ERRQUEUE) and hit this case quite often,
probably because busy polling only deals with sk_receive_queue.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20231005114504.642589-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2023-10-05 11:45:04 +00:00 committed by Jakub Kicinski
parent a1fb841f9d
commit 48533eca60
1 changed files with 3 additions and 0 deletions
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3
net/core/skbuff.c
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@ -5162,6 +5162,9 @@ struct sk_buff *sock_dequeue_err_skb(struct sock *sk)
bool icmp_next = false;
unsigned long flags;
if (skb_queue_empty_lockless(q))
return NULL;
spin_lock_irqsave(&q->lock, flags);
skb = __skb_dequeue(q);
if (skb && (skb_next = skb_peek(q))) {