Commit ee1836ae authored Oct 26, 2017 by Eric Dumazet Committed by David S. Miller Oct 28, 2017

tcp: refresh tp timestamp before tcp_mtu_probe()



In the unlikely event tcp_mtu_probe() is sending a packet, we
want tp->tcp_mstamp being as accurate as possible.

This means we need to call tcp_mstamp_refresh() a bit earlier in
tcp_write_xmit().

Fixes: 385e2070 ("tcp: use tp->tcp_mstamp in output path")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 63b9ab65

net/ipv4/tcp_output.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2239,6 +2239,7 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,

		sent_pkts = 0;

		tcp_mstamp_refresh(tp);
		if (!push_one) {
		/* Do MTU probing. */
		result = tcp_mtu_probe(sk);
		@@ -2250,7 +2251,6 @@ static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
		}

		max_segs = tcp_tso_segs(sk, mss_now);
		tcp_mstamp_refresh(tp);
		while ((skb = tcp_send_head(sk))) {
		unsigned int limit;