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 1951eaabee958236b75de466b078baa8f17a3efa..c99bbe2c5355e2f18d608c7516aa1a6764195a6a 100644 (file)
--- 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;