Import a clean-room implementation of the VEGAS congestion control algorithm

based on the paper "TCP Vegas: end to end congestion avoidance on a global
internet" by Brakmo and Peterson. It is implemented as a kernel module
compatible with the recently committed modular congestion control framework.

VEGAS uses network delay as a congestion indicator and unlike regular loss-based
algorithms, attempts to keep the network operating with stable queuing delays
and no congestion losses. By keeping network buffers used along the path within
a set range, queuing delays are kept low while maintaining high throughput.

In collaboration with:	David Hayes <dahayes at swin edu au> and
				Grenville Armitage <garmitage at swin edu au>
Sponsored by:	FreeBSD Foundation
Reviewed by:	bz and others along the way
MFC after:	3 months

2 files changed, 11 insertions, 1 deletions

diff --git a/sys/modules/cc/Makefile b/sys/modules/cc/Makefile
index 9743e7928e90..31554b06ab30 100644
--- a/sys/modules/cc/Makefile
+++ b/sys/modules/cc/Makefile
@@ -1,6 +1,7 @@
 # $FreeBSD$
 
 SUBDIR=	cc_cubic \
-	cc_htcp
+	cc_htcp \
+	cc_vegas
 
 .include <bsd.subdir.mk>
diff --git a/sys/modules/cc/cc_vegas/Makefile b/sys/modules/cc/cc_vegas/Makefile
new file mode 100644
index 000000000000..075bd41e4a2a
--- /dev/null
+++ b/sys/modules/cc/cc_vegas/Makefile
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+.include <bsd.own.mk>
+
+.PATH: ${.CURDIR}/../../../netinet/cc
+KMOD=	cc_vegas
+SRCS=	cc_vegas.c
+
+.include <bsd.kmod.mk>