From 3d2573f7ebe507e372a23cdd3c8b03305d6e90aa Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Sun, 24 Sep 2006 20:11:58 -0700 Subject: [PATCH] [TCP]: default congestion control menu 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 Signed-off-by: David S. Miller --- net/ipv4/Kconfig | 45 +++++++++++++++++++++++++++++++++----- net/ipv4/sysctl_net_ipv4.c | 6 +++++ net/ipv4/tcp_cong.c | 2 +- 3 files changed, 47 insertions(+), 6 deletions(-) diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index 1650b64415aa..1bbc3689cd8a 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -448,7 +448,7 @@ config INET_TCP_DIAG 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 @@ -459,9 +459,7 @@ config TCP_CONG_ADVANCED 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" @@ -574,12 +572,49 @@ config TCP_CONG_VENO 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" diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 19b2071ff319..e82a5be894b5 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -129,6 +129,12 @@ static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name, 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[] = { { diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c index 7ff2e4273a7c..af0aca1e6be6 100644 --- a/net/ipv4/tcp_cong.c +++ b/net/ipv4/tcp_cong.c @@ -48,7 +48,7 @@ int tcp_register_congestion_control(struct tcp_congestion_ops *ca) 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); -- 2.30.2