netdev - [PATCH net-2.6 1/1] [TCP]: Fix left

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Date:	Tue, 12 Jun 2007 11:50:29 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	David Miller <davem@...emloft.net>
cc:	Netdev <netdev@...r.kernel.org>
Subject: [PATCH net-2.6 1/1] [TCP]: Fix left_out setting during FRTO

Without FRTO, the tcp_try_to_open is never called with
lost_out > 0 (see tcp_time_to_recover). However, when FRTO is
enabled, the !tp->lost condition is not used until end of FRTO
because that way TCP avoids premature entry to fast recovery
during FRTO.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---

This case was found during left_out drop audit (only relevant to
net-2.6 since tcp-2.6 does a right thing after left_out drop).

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 74683d8..ed4a1bd 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2037,7 +2037,7 @@ static void tcp_try_to_open(struct sock *sk, int flag)
 {
 	struct tcp_sock *tp = tcp_sk(sk);

-	tp->left_out = tp->sacked_out;
+	tcp_sync_left_out(tp);

 	if (tp->retrans_out == 0)
 		tp->retrans_stamp = 0;
-- 
1.5.0.6