[TCP]: Add TCP Westwood congestion control module.

This is the existing 2.6.12 Westwood code moved from tcp_input
to the new congestion framework. A lot of the inline functions
have been eliminated to try and make it clearer.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 0 deletions

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 712ebacacb62..adbe855d931a 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -452,6 +452,21 @@ config TCP_CONG_BIC
         increase provides TCP friendliness.
         See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
 
+config TCP_CONG_WESTWOOD
+        tristate "TCP Westwood+"
+        depends on INET
+        default m
+        ---help---
+        TCP Westwood+ is a sender-side only modification of the TCP Reno
+        protocol stack that optimizes the performance of TCP congestion
+        control. It is based on end-to-end bandwidth estimation to set
+        congestion window and slow start threshold after a congestion
+        episode. Using this estimation, TCP Westwood+ adaptively sets a
+        slow start threshold and a congestion window which takes into
+        account the bandwidth used  at the time congestion is experienced.
+        TCP Westwood+ significantly increases fairness wrt TCP Reno in
+        wired networks and throughput over wireless links.
+
 endmenu
 
 source "net/ipv4/ipvs/Kconfig"