From 8ea3e439115a50b1927a4d035b2f84c46fc61c42 Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Thu, 13 Apr 2017 08:40:53 -0700 Subject: [PATCH] Subject: net: allow configuring default qdisc Since 3.12 it has been possible to configure the default queuing discipline via sysctl. This patch adds ability to configure the default queue discipline in kernel configuration. This is useful for environments where configuring the value from userspace is difficult to manage. The default is still the same as before (pfifo_fast) and it is possible to change after kernel init with sysctl. This is similar to how TCP congestion control works. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/sched/Kconfig | 45 +++++++++++++++++++++++++++++++++++++++++++++ net/sched/sch_api.c | 9 +++++++++ 2 files changed, 54 insertions(+) diff --git a/net/sched/Kconfig b/net/sched/Kconfig index 403790cce7d2..9fb84f0de6af 100644 --- a/net/sched/Kconfig +++ b/net/sched/Kconfig @@ -352,6 +352,51 @@ config NET_SCH_PLUG To compile this code as a module, choose M here: the module will be called sch_plug. +menuconfig NET_SCH_DEFAULT + bool "Allow override default queue discipline" + ---help--- + Support for selection of default queuing discipline. + + Nearly all users can safely say no here, and the default + of pfifo_fast will be used. Many distributions already set + the default value via /proc/sys/net/core/default_qdisc. + + If unsure, say N. + +if NET_SCH_DEFAULT + +choice + prompt "Default queuing discipline" + default DEFAULT_PFIFO_FAST + help + Select the queueing discipline that will be used by default + for all network devices. + + config DEFAULT_FQ + bool "Fair Queue" if NET_SCH_FQ + + config DEFAULT_CODEL + bool "Controlled Delay" if NET_SCH_CODEL + + config DEFAULT_FQ_CODEL + bool "Fair Queue Controlled Delay" if NET_SCH_FQ_CODEL + + config DEFAULT_SFQ + bool "Stochastic Fair Queue" if NET_SCH_SFQ + + config DEFAULT_PFIFO_FAST + bool "Priority FIFO Fast" +endchoice + +config DEFAULT_NET_SCH + string + default "pfifo_fast" if DEFAULT_PFIFO_FAST + default "fq" if DEFAULT_FQ + default "fq_codel" if DEFAULT_FQ_CODEL + default "sfq" if DEFAULT_SFQ + default "pfifo_fast" +endif + comment "Classification" config NET_CLS diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index fcb5ae581c04..9b09ef9f944d 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -251,6 +251,15 @@ int qdisc_set_default(const char *name) return ops ? 0 : -ENOENT; } +#ifdef CONFIG_NET_SCH_DEFAULT +/* Set default value from kernel config */ +static int __init sch_default_qdisc(void) +{ + return qdisc_set_default(CONFIG_DEFAULT_NET_SCH); +} +late_initcall(sch_default_qdisc); +#endif + /* We know handle. Find qdisc among all qdisc's attached to device * (root qdisc, all its children, children of children etc.) * Note: caller either uses rtnl or rcu_read_lock() -- 2.20.1