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tcp: avoid dst->ops->check() call in tcp_v{4,6}_do_rcv()

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If incoming skb dst matches the socket cached one,
there is no need to call again dst->ops->check().

Network layer already validated the skb dst for us,
usually from tcp_v{4,6}_early_demux().

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260306154322.1086539-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-03-06 15:43:22 +00:00 committed by Jakub Kicinski
parent 6927430735
commit 82f36517a1
2 changed files with 2 additions and 2 deletions
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2
net/ipv4/tcp_ipv4.c
View File

@ -1855,7 +1855,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
sock_rps_save_rxhash(sk, skb);
sk_mark_napi_id(sk, skb);
if (dst) {
if (dst && unlikely(dst != skb_dst(skb))) {
if (sk->sk_rx_dst_ifindex != skb->skb_iif ||
!INDIRECT_CALL_1(dst->ops->check, ipv4_dst_check,
dst, 0)) {

2
net/ipv6/tcp_ipv6.c
View File

@ -1596,7 +1596,7 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
sock_rps_save_rxhash(sk, skb);
sk_mark_napi_id(sk, skb);
if (dst) {
if (dst && unlikely(dst != skb_dst(skb))) {
if (sk->sk_rx_dst_ifindex != skb->skb_iif ||
INDIRECT_CALL_1(dst->ops->check, ip6_dst_check,
dst, sk->sk_rx_dst_cookie) == NULL) {