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net: avoid dirtying sk->sk_napi_id 

sk_napi_id is located in a cache line that can be kept read mostly.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2021-10-25 09:48:18 -07:00 committed by Jakub Kicinski
parent ef57c1610d
commit 2b13af8ade
1 changed files with 2 additions and 1 deletions
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3
include/net/busy_poll.h
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@ -130,7 +130,8 @@ static inline void skb_mark_napi_id(struct sk_buff *skb,
static inline void sk_mark_napi_id(struct sock *sk, const struct sk_buff *skb)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
if (unlikely(READ_ONCE(sk->sk_napi_id) != skb->napi_id))
WRITE_ONCE(sk->sk_napi_id, skb->napi_id);
#endif
sk_rx_queue_set(sk, skb);
}