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udp: relax atomic operation on sk->sk_rmem_alloc

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atomic_add_return() is more expensive than atomic_add()
and seems overkill in UDP rx fast path.

Signed-off-by: Eric Dumazet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
This commit is contained in:
Eric Dumazet authored and Jakub Kicinski committed 2024-03-29 15:03:10 -07:00
1 parent 6055796995
commit 6a1f12dd85
1 file changed
+1 -6
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net/ipv4/udp.c
+1 -6
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@@ -1516,12 +1516,7 @@ int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb)
size = skb->truesize;
udp_set_dev_scratch(skb);
/* we drop only if the receive buf is full and the receive
* queue contains some other skb
*/
rmem = atomic_add_return(size, &sk->sk_rmem_alloc);
if (rmem > (size + (unsigned int)sk->sk_rcvbuf))
goto uncharge_drop;
atomic_add(size, &sk->sk_rmem_alloc);
spin_lock(&list->lock);
err = udp_rmem_schedule(sk, size);