tcp: refresh tp timestamp before tcp_mtu_probe()

[ Upstream commit ee1836aec4f5a977c1699a311db4d9027ef21ac8 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 40f7c8ee9ba6ccd786881c3594217874d7ad5b83..9798460b61ab1d4c6c87c4beef0a41c55c6edbc4 100644 (file)
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2271,6 +2271,7 @@ 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);
@@ -2282,7 +2283,6 @@ 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;