[TCP]: Add TCP BIC congestion control module.

TCP BIC congestion control reworked to use the new congestion control 
infrastructure. This version is more up to date than the BIC
code in 2.6.12; it incorporates enhancements from BICTCP 1.1, 
to handle low latency links.

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

net/ipv4/Kconfig

@@ -433,5 +433,26 @@ config IP_TCPDIAG
 config IP_TCPDIAG_IPV6
 	def_bool (IP_TCPDIAG=y && IPV6=y) || (IP_TCPDIAG=m && IPV6)
 
+# TCP Reno is builtin (required as fallback)
+menu "TCP congestion control"
+	depends on INET
+
+config TCP_CONG_BIC
+	tristate "Binary Increase Congestion (BIC) control"
+	depends on INET
+	default y
+	---help---
+	BIC-TCP is a sender-side only change that ensures a linear RTT
+	fairness under large windows while offering both scalability and
+	bounded TCP-friendliness. The protocol combines two schemes
+	called additive increase and binary search increase. When the
+	congestion window is large, additive increase with a large
+	increment ensures linear RTT fairness as well as good
+	scalability. Under small congestion windows, binary search
+	increase provides TCP friendliness.
+	See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
+
+endmenu
+
 source "net/ipv4/ipvs/Kconfig"