[TCP]: Add H-TCP congestion control module.

H-TCP is a congestion control algorithm developed at the Hamilton Institute, by
Douglas Leith and Robert Shorten. It is extending the standard Reno algorithm
with mode switching is thus a relatively simple modification.

H-TCP is defined in a layered manner as it is still a research platform. The
basic form includes the modification of beta according to the ratio of maxRTT
to min RTT and the alpha=2*factor*(1-beta) relation, where factor is dependant
on the time since last congestion.

The other layers improve convergence by adding appropriate factors to alpha.

The following patch implements the H-TCP algorithm in it's basic form.

Signed-Off-By: Baruch Even <baruch@ev-en.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 6c105b6..73a25b5 100644 (file)
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -467,6 +467,18 @@ config TCP_CONG_WESTWOOD
        TCP Westwood+ significantly increases fairness wrt TCP Reno in
        wired networks and throughput over wireless links.
 
+config TCP_CONG_HTCP
+        tristate "H-TCP"
+       depends on INET
+        default m
+       ---help---
+       H-TCP is a send-side only modifications of the TCP Reno
+       protocol stack that optimizes the performance of TCP
+       congestion control for high speed network links. It uses a
+       modeswitch to change the alpha and beta parameters of TCP Reno
+       based on network conditions and in a way so as to be fair with
+       other Reno and H-TCP flows.
+
 config TCP_CONG_HSTCP
        tristate "High Speed TCP"
        depends on INET && EXPERIMENTAL
@@ -499,6 +511,7 @@ config TCP_CONG_VEGAS
        window. TCP Vegas should provide less packet loss, but it is
        not as aggressive as TCP Reno.
 
+
 endmenu
 
 source "net/ipv4/ipvs/Kconfig"

diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index a801a97..e96ed17 100644 (file)
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_TCP_CONG_BIC) += tcp_bic.o
 obj-$(CONFIG_TCP_CONG_WESTWOOD) += tcp_westwood.o
 obj-$(CONFIG_TCP_CONG_HSTCP) += tcp_highspeed.o
 obj-$(CONFIG_TCP_CONG_HYBLA) += tcp_hybla.o
+obj-$(CONFIG_TCP_CONG_HTCP) += tcp_htcp.o
 obj-$(CONFIG_TCP_CONG_VEGAS) += tcp_vegas.o
 
 obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \

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