netdev - [PATCH] [TCP]: Correct reordering detection change (no FRTO case)

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Message-ID: <Pine.LNX.4.64.0702231802140.19465@kivilampi-30.cs.helsinki.fi>
Date:	Fri, 23 Feb 2007 18:09:10 +0200 (EET)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	David Miller <davem@...emloft.net>
cc:	netdev@...r.kernel.org
Subject: [PATCH] [TCP]: Correct reordering detection change (no FRTO case)

The reordering detection must work also when FRTO has not been
used at all which was the original intention of mine, just the
expression of the idea was flawed.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---
Applies on the top of tcp-2.6 branch as you would probably have
guessed.

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index bb3f234..f6ba07f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1240,7 +1240,7 @@ tcp_sacktag_write_queue(struct sock *sk,
 	tp->left_out = tp->sacked_out + tp->lost_out;
 
 	if ((reord < tp->fackets_out) && icsk->icsk_ca_state != TCP_CA_Loss &&
-	    (tp->frto_highmark && after(tp->snd_una, tp->frto_highmark)))
+	    (!tp->frto_highmark || after(tp->snd_una, tp->frto_highmark)))
 		tcp_update_reordering(sk, ((tp->fackets_out + 1) - reord), 0);
 
 #if FASTRETRANS_DEBUG > 0
-- 
1.4.2