From: John Heffner <jheffner@psc.edu>
Date: Tue, 10 Apr 2007 20:36:40 +0000 (-0700)
Subject: Fix TCP receiver side SWS handling.
X-Git-Tag: v2.6.20.7~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12da1b6a092a13c2cf4903fd0d39c139d511ef96;p=thirdparty%2Fkernel%2Fstable.git

Fix TCP receiver side SWS handling.

[TCP]: Do receiver-side SWS avoidance for rcvbuf < MSS.

Signed-off-by: John Heffner <jheffner@psc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 1951eaabee958..c99bbe2c5355e 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -1607,6 +1607,9 @@ u32 __tcp_select_window(struct sock *sk)
 		 */
 		if (window <= free_space - mss || window > free_space)
 			window = (free_space/mss)*mss;
+		else if (mss == full_space &&
+		         free_space > window + full_space/2)
+			window = free_space;
 	}
 
 	return window;