Merge pull request #7023 from luizluca/switchdev_poller
switchdev_poller: add new package (RFC)
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Rosen Penev
GitHub
commit
3afa70ddea
3 changed files with 217 additions and 0 deletions
40
net/switchdev-poller/Makefile
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40
net/switchdev-poller/Makefile
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#
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# Copyright (C) 2018-2019 Luiz Angelo Daros de Luca
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#
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# This is free software, licensed under the GNU General Public License v2.
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#
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include $(TOPDIR)/rules.mk
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PKG_NAME:=switchdev-poller
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PKG_VERSION:=1.0.1
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PKG_RELEASE:=1
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PKG_MAINTAINER:=Luiz Angelo Daros de Luca <luizluca@gmail.com>
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PKG_LICENSE:=GPLv2
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PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
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include $(INCLUDE_DIR)/package.mk
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define Package/switchdev-poller
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SECTION:=net
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CATEGORY:=Network
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DEPENDS:=+swconfig
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TITLE:=Poll switchdev port to bring CPU ports up/down
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PKGARCH:=all
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endef
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define Package/switchdev-poller/description
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This service monitors switchdev ports and brings down CPU ports when
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all related non-CPU vlan ports are also down. Otherwise, it brings
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the port up.
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endef
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define Build/Compile
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endef
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define Package/switchdev-poller/install
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$(CP) ./files/* $(1)
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endef
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$(eval $(call BuildPackage,switchdev-poller))
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18
net/switchdev-poller/files/etc/init.d/switchdev-poller
Executable file
18
net/switchdev-poller/files/etc/init.d/switchdev-poller
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#!/bin/sh /etc/rc.common
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# Copyright (C) 2018-2019 Luiz Angelo Daros de Luca <luizluca@gmail.com>
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START=99
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USE_PROCD=1
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start_service() {
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procd_open_instance switchdev-poller
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procd_set_param command /usr/lib/switchdev-poller/switchdev-poller
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procd_set_param stdout 1
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procd_set_param stderr 0 # enable for extra debug info
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procd_set_param respawn 3600 5 5
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procd_close_instance
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}
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service_triggers() {
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procd_add_reload_trigger network
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}
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159
net/switchdev-poller/files/usr/lib/switchdev-poller/switchdev-poller
Executable file
159
net/switchdev-poller/files/usr/lib/switchdev-poller/switchdev-poller
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#!/bin/sh
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# shellcheck disable=SC2039,SC1091
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# https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, SC2039: In POSIX sh, string replacement is undefined.
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# https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, string indexing is undefined.
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# https://www.shellcheck.net/wiki/SC1091 -- Not following: /lib/functions.sh:...
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# Copyright (C) 2018 Luiz Angelo Daros de Luca <luizluca@gmail.com>
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#
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# Pools switchdev for port changes
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#
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[ -n "$NICED" ] && NICED=1 exec nice -n 19 "$0" "$@"
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. /usr/share/libubox/jshn.sh
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. /lib/functions.sh
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cpu_ports=""
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json_init
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json_load "$(cat /etc/board.json)"
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switches=
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json_get_keys switches switch
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json_select switch
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for switch in $switches; do
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echo Loading $switch >&2
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json_select "$switch"
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if json_is_a ports array; then
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ports=
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json_get_keys ports ports
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json_select ports
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for port in $ports; do
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echo Checking port "$port" in "$switch" >&2
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json_select "$port"
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num=
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json_get_vars num device
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if [ -n "$device" ]; then
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echo "Port ${switch}_$num is CPU port as $device" >&2
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cpu_ports="$cpu_ports ${switch}_$num=$device"
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fi
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json_select ..
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done
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json_select ..
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fi
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json_select ..
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done
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each_switch_vlan() {
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switch=
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vlan=
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ports=
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config_get switch "$1" device
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config_get vlan "$1" vlan
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config_get ports "$1" ports
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[ -n "$vlan" ] || { echo "No vlan for '$1'" >&2; return 1; }
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[ -n "$switch" ] || { echo "No device for '$1'" >&2; return 1; }
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vlan_ifnames=""
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vlan_non_cpu_ports=""
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echo Checking vlan "$vlan" in $switch >&2
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for port in $ports; do
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case $port in
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*t) tagged=1; port=${port:0:-1} ;;
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*) tagged= ;;
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esac
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echo "Checking port $port in $switch used by vlan $vlan" >&2
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cpu_port_ifname=""
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for cpu_port in $cpu_ports; do
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device=${cpu_port#*=}
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cpu_switchport=${cpu_port%=*}
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[ "${cpu_switchport}" = "${switch}_${port}" ] || continue
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echo "Port $port in $switch used by $vlan is a CPU port at $device" >&2
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for device_tagged in $device_tagged; do
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[ "${tagged}" = 1 ] && not_tagged=0 || not_tagged=1
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if [ "$device_tagged" = "$device=${not_tagged}" ]; then
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echo "Cannot control CPU port ${cpu_switchport} when it is used both as tagged and not tagged"
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exit 1
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fi
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done
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device_tagged="${device_tagged} ${device}=${tagged:-0}"
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cpu_port_ifname=${device}${tagged+.$vlan}
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done
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if [ -n "$cpu_port_ifname" ]; then
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vlan_ifnames="$vlan_ifnames $cpu_port_ifname"
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continue
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fi
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vlan_non_cpu_ports="$vlan_non_cpu_ports ${port}"
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done
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vlan_non_cpu_switch_ports="${vlan_non_cpu_ports// /:${switch}_}"
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vlan_non_cpu_switch_ports="${vlan_non_cpu_switch_ports:1}"
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vlan_non_cpu_ports="${vlan_non_cpu_ports:1}"
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for vlan_ifname in $vlan_ifnames; do
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devices2ports="$devices2ports $vlan_ifname=${vlan_non_cpu_switch_ports}"
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echo "Monitoring $switch (ports ${vlan_non_cpu_ports// /,}) for $vlan_ifname"
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done
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}
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device_tagged=""
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devices2ports=""
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config_load network
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config_foreach each_switch_vlan switch_vlan
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cleanup() {
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for device2ports in $devices2ports; do
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device=${device2ports%=*}
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ip link show dev ${device}_down >/dev/null 2>&1 && {
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echo "Bringing up $device on exit..."
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ip link set dev ${device}_down name ${device}
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ip link set dev ${device} up >/dev/null 2>&1;
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}
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done
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echo "Stopped poller"
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exit
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}
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trap cleanup INT TERM
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echo "Starting poller"
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while true; do (
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for device2ports in $devices2ports; do
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device=${device2ports%=*}
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switch_ports=${device2ports#*=}
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switch_ports=${switch_ports//:/ }
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should_be_up=false
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for switch_port in $switch_ports; do
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state=$(eval echo \$${switch_port})
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if [ -z "${state}" ]; then
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switch=${switch_port%_*}
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port=${switch_port#*_}
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echo "Polling $switch_port..." >&2
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swconfig dev $switch port $port get link | grep -q 'link:up' &&
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state=up || state=down
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eval "$switch_port=$state"
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echo "State of $switch_port, used by $device, is $state" >&2
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else
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echo "State of $switch_port, used by $device, is $state (cached)" >&2
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fi
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[ $state = up ] && should_be_up=true
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done
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if $should_be_up; then
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ip link show dev ${device}_down >/dev/null 2>&1 && {
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echo "Bringing up $device..."
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ip link set dev ${device}_down name ${device}
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ip link set dev ${device} up >/dev/null 2>&1;
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}
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else
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ip link show dev ${device} >/dev/null 2>&1 && {
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echo "Bringing down $device..."
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ip link set dev ${device} down >/dev/null 2>&1;
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ip link set dev ${device} name ${device}_down
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}
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fi
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done )
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sleep 3
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done
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