+#!/bin/sh
+NPROCS="$(grep -c "^processor.*:" /proc/cpuinfo)"
+[ "$NPROCS" -gt 1 ] || exit
+
+PROC_MASK="$(( (1 << $NPROCS) - 1 ))"
+
+find_irq_cpu() {
+ local dev="$1"
+ local match="$(grep -m 1 "$dev\$" /proc/interrupts)"
+ local cpu=0
+
+ [ -n "$match" ] && {
+ set -- $match
+ shift
+ for cur in $(seq 1 $NPROCS); do
+ [ "$1" -gt 0 ] && {
+ cpu=$(($cur - 1))
+ break
+ }
+ shift
+ done
+ }
+
+ echo "$cpu"
+}
+
+set_hex_val() {
+ local file="$1"
+ local val="$2"
+ val="$(printf %x "$val")"
+ [ -n "$DEBUG" ] && echo "$file = $val"
+ echo "$val" > "$file"
+}
+
+packet_steering="$(uci get "network.@globals[0].packet_steering")"
+[ "$packet_steering" != 1 ] && exit 0
+
+exec 512>/var/lock/smp_tune.lock
+flock 512 || exit 1
+
+[ -e "/usr/libexec/platform/packet-steering.sh" ] && {
+ /usr/libexec/platform/packet-steering.sh
+ exit 0
+}
+
+for dev in /sys/class/net/*; do
+ [ -d "$dev" ] || continue
+
+ # ignore virtual interfaces
+ [ -n "$(ls "${dev}/" | grep '^lower_')" ] && continue
+ [ -d "${dev}/device" ] || continue
+
+ device="$(readlink "${dev}/device")"
+ device="$(basename "$device")"
+ irq_cpu="$(find_irq_cpu "$device")"
+ irq_cpu_mask="$((1 << $irq_cpu))"
+
+ for q in ${dev}/queues/tx-*; do
+ set_hex_val "$q/xps_cpus" "$PROC_MASK"
+ done
+
+ # ignore dsa slave ports for RPS
+ subsys="$(readlink "${dev}/device/subsystem")"
+ subsys="$(basename "$subsys")"
+ [ "$subsys" = "mdio_bus" ] && continue
+
+ for q in ${dev}/queues/rx-*; do
+ set_hex_val "$q/rps_cpus" "$PROC_MASK"
+ done
+done