tcp: refresh tp timestamp before tcp_mtu_probe()
authorEric Dumazet <edumazet@google.com>
Fri, 27 Oct 2017 04:21:40 +0000 (21:21 -0700)
committerDavid S. Miller <davem@davemloft.net>
Sat, 28 Oct 2017 10:08:04 +0000 (19:08 +0900)
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: 385e20706fac ("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>
net/ipv4/tcp_output.c

index 1151870..ae60dd3 100644 (file)
@@ -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;