From 84565070e442583ec67fb08a5962c80203e491c3 Mon Sep 17 00:00:00 2001
From: John Heffner <jheffner@psc.edu>
Date: Mon, 2 Apr 2007 13:56:32 -0700
Subject: [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>
---
 net/ipv4/tcp_output.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index dc151139b5a..688b95594f2 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;
-- 
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