From: Per Hurtig <per.hurtig@kau.se>
To: netdev@vger.kernel.org
Cc: Per Hurtig <per.hurtig@kau.se>,
eric.dumazet@gmail.com, anna.brunstrom@kau.se,
mohammad.rajiullah@kau.se, ncardwell@google.com,
nanditad@google.com, sergei.shtylyov@cogentembedded.com
Subject: [PATCH] tcp: fixing TLP's FIN recovery
Date: Sat, 7 Jun 2014 16:34:40 +0200 [thread overview]
Message-ID: <1402151680-11434-1-git-send-email-per.hurtig@kau.se> (raw)
In-Reply-To: <539319F6.2090907@cogentembedded.com>
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>
---
net/ipv4/tcp_output.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index d463c35..6573765 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2130,8 +2130,10 @@ 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)
+ /* Probe with zero data doesn't trigger fast recovery, if FIN
+ * flag is not set.
+ */
+ if ((skb->len > 0) || (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN))
err = __tcp_retransmit_skb(sk, skb);
/* Record snd_nxt for loss detection. */
--
1.9.1
next prev parent reply other threads:[~2014-06-07 14:35 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-06 18:46 tcp: fixing TLP's FIN recovery Per Hurtig
2014-06-06 19:07 ` Eric Dumazet
2014-06-07 11:10 ` [PATCH] " Per Hurtig
2014-06-07 13:56 ` Sergei Shtylyov
2014-06-07 14:34 ` Per Hurtig [this message]
2014-06-08 2:58 ` Eric Dumazet
2014-06-08 7:41 ` Per Hurtig
2014-06-08 16:35 ` Eric Dumazet
2014-06-09 7:04 ` Nandita Dukkipati
2014-06-09 7:02 ` Nandita Dukkipati
2014-06-09 13:13 ` Per Hurtig
2014-06-09 14:33 ` Eric Dumazet
2014-06-09 14:39 ` Eric Dumazet
2014-06-09 14:42 ` Per Hurtig
2014-06-09 15:04 ` Eric Dumazet
2014-06-09 15:56 ` Per Hurtig
2014-06-09 16:15 ` Eric Dumazet
2014-06-09 16:24 ` Eric Dumazet
2014-06-09 18:33 ` Eric Dumazet
2014-06-12 14:21 ` Weiping Pan
2014-06-12 14:32 ` Eric Dumazet
2014-06-12 15:08 ` [PATCH v2 1/1] " Per Hurtig
2014-06-12 15:28 ` Eric Dumazet
2014-06-12 17:36 ` Nandita Dukkipati
2014-06-12 17:46 ` Neal Cardwell
2014-06-12 18:06 ` David Miller
2014-10-07 15:03 ` Josh Hunt
2014-10-07 20:17 ` David Miller
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