tcp: fixing TLP's FIN recovery
authorPer Hurtig <per.hurtig@kau.se>
Thu, 12 Jun 2014 15:08:32 +0000 (17:08 +0200)
committerDavid S. Miller <davem@davemloft.net>
Thu, 12 Jun 2014 18:05:51 +0000 (11:05 -0700)
Fix to a problem observed when losing a FIN segment that does not
contain data.  In such situations, TLP is unable to recover from
*any* tail loss and instead adds at least PTO ms to the
retransmission process, i.e., RTO = RTO + PTO.

Signed-off-by: Per Hurtig <per.hurtig@kau.se>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Nandita Dukkipati <nanditad@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_output.c

index ad7549f1d0ad3799a894b7d9a9a74299efdb06e9..819bf0c8fbdeefe20db07c70c2852c4e528bcfa9 100644 (file)
@@ -2131,9 +2131,7 @@ void tcp_send_loss_probe(struct sock *sk)
        if (WARN_ON(!skb || !tcp_skb_pcount(skb)))
                goto rearm_timer;
 
-       /* Probe with zero data doesn't trigger fast recovery. */
-       if (skb->len > 0)
-               err = __tcp_retransmit_skb(sk, skb);
+       err = __tcp_retransmit_skb(sk, skb);
 
        /* Record snd_nxt for loss detection. */
        if (likely(!err))