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kernel: add kmod-tcp-bbr 

This adds support for BBR (Bottleneck Bandwidth and RTT) TCP
congestion control. Applications (e.g. webservers, VPN client/server)
which initiate connections from router side can benefit from this.

This provide an easier way for users to use BBR by selecting /
installing kmod-tcp-bbr instead of altering kernel config and
compiling firmware by themselves.

Signed-off-by: Keith Wong <keithwky@gmail.com>
(backported from 79c233daa4)
openwrt-18.06
Keith Wong 2018-04-12 11:21:08 +08:00 committed by Jo-Philipp Wich
parent 39420c3ead
commit 9afbe27bd0
3 changed files with 40 additions and 0 deletions
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5
package/kernel/linux/files/sysctl-tcp-bbr-k4_9.conf Normal file
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@ -0,0 +1,5 @@
# Do not edit, changes to this file will be lost on upgrades
# /etc/sysctl.conf can be used to customize sysctl settings
net.ipv4.tcp_congestion_control=bbr
net.core.default_qdisc=fq

4
package/kernel/linux/files/sysctl-tcp-bbr.conf Normal file
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@ -0,0 +1,4 @@
# Do not edit, changes to this file will be lost on upgrades
# /etc/sysctl.conf can be used to customize sysctl settings
net.ipv4.tcp_congestion_control=bbr

31
package/kernel/linux/modules/netsupport.mk
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@ -777,6 +777,37 @@ endef
$(eval $(call KernelPackage,sched))
define KernelPackage/tcp-bbr
SUBMENU:=$(NETWORK_SUPPORT_MENU)
TITLE:=BBR TCP congestion control
DEPENDS:=@!LINUX_3_18 @!LINUX_4_1 @!LINUX_4_4 +LINUX_4_9:kmod-sched
KCONFIG:= \
CONFIG_TCP_CONG_ADVANCED=y \
CONFIG_TCP_CONG_BBR
FILES:=$(LINUX_DIR)/net/ipv4/tcp_bbr.ko
AUTOLOAD:=$(call AutoLoad,74,tcp_bbr)
endef
define KernelPackage/tcp-bbr/description
Kernel module for BBR (Bottleneck Bandwidth and RTT) TCP congestion
control. It requires the fq ("Fair Queue") pacing packet scheduler.
For kernel 4.13+, TCP internal pacing is implemented as fallback.
endef
ifdef CONFIG_LINUX_4_9
TCP_BBR_SYSCTL_CONF:=sysctl-tcp-bbr-k4_9.conf
else
TCP_BBR_SYSCTL_CONF:=sysctl-tcp-bbr.conf
endif
define KernelPackage/tcp-bbr/install
$(INSTALL_DIR) $(1)/etc/sysctl.d
$(INSTALL_DATA) ./files/$(TCP_BBR_SYSCTL_CONF) $(1)/etc/sysctl.d/12-tcp-bbr.conf
endef
$(eval $(call KernelPackage,tcp-bbr))
define KernelPackage/ax25
SUBMENU:=$(NETWORK_SUPPORT_MENU)
TITLE:=AX25 support