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tcp: fixing TLP's FIN recovery

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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>
This commit is contained in:
Per Hurtig 2014-06-12 17:08:32 +02:00 • committed by David S. Miller
commit bef1909ee3
1 changed files with 1 additions and 3 deletions
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4
net/ipv4/tcp_output.c
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@ -2131,9 +2131,7 @@ void tcp_send_loss_probe(struct sock *sk)
if (WARN_ON(!skb || !tcp_skb_pcount(skb))) if (WARN_ON(!skb || !tcp_skb_pcount(skb)))
goto rearm_timer; goto rearm_timer;
/* Probe with zero data doesn't trigger fast recovery. */ err = __tcp_retransmit_skb(sk, skb);
if (skb->len > 0)
err = __tcp_retransmit_skb(sk, skb);
/* Record snd_nxt for loss detection. */ /* Record snd_nxt for loss detection. */
if (likely(!err)) if (likely(!err))