[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>

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 712ebac..adbe855 100644 (file)
--- 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"

diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index 1d1cac5..dedfbe6 100644 (file)
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_IP_VS) += ipvs/
 obj-$(CONFIG_IP_TCPDIAG) += tcp_diag.o 
 obj-$(CONFIG_IP_ROUTE_MULTIPATH_CACHED) += multipath.o
 obj-$(CONFIG_TCP_CONG_BIC) += tcp_bic.o
+obj-$(CONFIG_TCP_CONG_WESTWOOD) += tcp_westwood.o
 
 obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
                      xfrm4_output.o

diff --cc net/ipv4/tcp_westwood.c
Simple merge