Change how default TCP congestion control is chosen. Don't just use
last installed module, instead allow selection during configuration,
and make sure and use the default regardless of load order.
Signed-off-by: Stephen Hemminger <[EMAIL PROTECTED]>
---
net/ipv4/Kconfig | 45 ++++++++++++++++++++++++++++++++++++++++-----
net/ipv4/sysctl_net_ipv4.c | 6 ++++++
net/ipv4/tcp_cong.c | 2 +-
3 files changed, 47 insertions(+), 6 deletions(-)
--- net-2.6.19.orig/net/ipv4/Kconfig 2006-09-19 16:13:02.000000000 -0700
+++ net-2.6.19/net/ipv4/Kconfig 2006-09-20 11:17:45.000000000 -0700
@@ -447,7 +447,7 @@
depends on INET_DIAG
def_tristate INET_DIAG
-config TCP_CONG_ADVANCED
+menuconfig TCP_CONG_ADVANCED
bool "TCP: advanced congestion control"
---help---
Support for selection of various TCP congestion control
@@ -458,9 +458,7 @@
If unsure, say N.
-# TCP Reno is builtin (required as fallback)
-menu "TCP congestion control"
- depends on TCP_CONG_ADVANCED
+if TCP_CONG_ADVANCED
config TCP_CONG_BIC
tristate "Binary Increase Congestion (BIC) control"
@@ -573,12 +571,49 @@
loss packets.
See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
-endmenu
+choice
+ prompt "Default TCP congestion control"
+ default DEFAULT_BIC
+ help
+ Select the TCP congestion control that will be used by default
+ for all connections.
+
+ config DEFAULT_BIC
+ bool "Bic" if TCP_CONG_BIC=y
+
+ config DEFAULT_CUBIC
+ bool "Cubic" if TCP_CONG_CUBIC=y
+
+ config DEFAULT_HTCP
+ bool "Htcp" if TCP_CONG_HTCP=y
+
+ config DEFAULT_VEGAS
+ bool "Vegas" if TCP_CONG_VEGAS=y
+
+ config DEFAULT_WESTWOOD
+ bool "Westwood" if TCP_CONG_WESTWOOD=y
+
+ config DEFAULT_RENO
+ bool "Reno"
+
+endchoice
+
+endif
config TCP_CONG_BIC
tristate
depends on !TCP_CONG_ADVANCED
default y
+config DEFAULT_TCP_CONG
+ string
+ default "bic" if DEFAULT_BIC
+ default "cubic" if DEFAULT_CUBIC
+ default "htcp" if DEFAULT_HTCP
+ default "vegas" if DEFAULT_VEGAS
+ default "westwood" if DEFAULT_WESTWOOD
+ default "reno" if DEFAULT_RENO
+ default "bic"
+
source "net/ipv4/ipvs/Kconfig"
--- net-2.6.19.orig/net/ipv4/sysctl_net_ipv4.c 2006-09-19 16:13:02.000000000
-0700
+++ net-2.6.19/net/ipv4/sysctl_net_ipv4.c 2006-09-19 16:13:05.000000000
-0700
@@ -129,6 +129,12 @@
return ret;
}
+static int __init tcp_congestion_default(void)
+{
+ return tcp_set_default_congestion_control(CONFIG_DEFAULT_TCP_CONG);
+}
+
+late_initcall(tcp_congestion_default);
ctl_table ipv4_table[] = {
{
--- net-2.6.19.orig/net/ipv4/tcp_cong.c 2006-09-19 16:13:02.000000000 -0700
+++ net-2.6.19/net/ipv4/tcp_cong.c 2006-09-19 16:13:05.000000000 -0700
@@ -48,7 +48,7 @@
printk(KERN_NOTICE "TCP %s already registered\n", ca->name);
ret = -EEXIST;
} else {
- list_add_rcu(&ca->list, &tcp_cong_list);
+ list_add_tail_rcu(&ca->list, &tcp_cong_list);
printk(KERN_INFO "TCP %s registered\n", ca->name);
}
spin_unlock(&tcp_cong_list_lock);
-
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