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tcp: remove indirect calls for icsk->icsk_af_ops->send_check

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Mitigate RETPOLINE costs in __tcp_transmit_skb()
by using INDIRECT_CALL_INET() wrapper.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2020-06-19 12:12:35 -07:00 • committed by David S. Miller
parent 05e22e8395
commit dd2e0b86fc
4 changed files with 14 additions and 10 deletions
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5
net/ipv4/tcp_output.c
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@ -1066,6 +1066,7 @@ static void tcp_update_skb_after_send(struct sock *sk, struct sk_buff *skb,
INDIRECT_CALLABLE_DECLARE(int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl));
INDIRECT_CALLABLE_DECLARE(int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl));
INDIRECT_CALLABLE_DECLARE(void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb));
/* This routine actually transmits TCP packets queued in by
* tcp_do_sendmsg(). This is used by both the initial
@ -1210,7 +1211,9 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
}
#endif
icsk->icsk_af_ops->send_check(sk, skb);
INDIRECT_CALL_INET(icsk->icsk_af_ops->send_check,
tcp_v6_send_check, tcp_v4_send_check,
sk, skb);
if (likely(tcb->tcp_flags & TCPHDR_ACK))
tcp_event_ack_sent(sk, tcp_skb_pcount(skb), rcv_nxt);