package/network/config/netifd/files/etc/hotplug.d/net/20-smp-packet-steering

   1 #!/bin/sh
   2 [ "$ACTION" = add ] || exit
   3
   4 NPROCS="$(grep -c "^processor.*:" /proc/cpuinfo)"
   5 [ "$NPROCS" -gt 1 ] || exit
   6
   7 PROC_MASK="$(( (1 << $NPROCS) - 1 ))"
   8
   9 find_irq_cpu() {
  10         local dev="$1"
  11         local match="$(grep -m 1 "$dev\$" /proc/interrupts)"
  12         local cpu=0
  13
  14         [ -n "$match" ] && {
  15                 set -- $match
  16                 shift
  17                 for cur in $(seq 1 $NPROCS); do
  18                         [ "$1" -gt 0 ] && {
  19                                 cpu=$(($cur - 1))
  20                                 break
  21                         }
  22                         shift
  23                 done
  24         }
  25
  26         echo "$cpu"
  27 }
  28
  29 set_hex_val() {
  30         local file="$1"
  31         local val="$2"
  32         val="$(printf %x "$val")"
  33         [ -n "$DEBUG" ] && echo "$file = $val"
  34         echo "$val" > "$file"
  35 }
  36
  37 packet_steering="$(uci get "network.@globals[0].packet_steering")"
  38 [ "$packet_steering" != 1 ] && exit 0
  39
  40 exec 512>/var/lock/smp_tune.lock
  41 flock 512 || exit 1
  42
  43 for dev in /sys/class/net/*; do
  44         [ -d "$dev" ] || continue
  45
  46         # ignore virtual interfaces
  47         [ -n "$(ls "${dev}/" | grep '^lower_')" ] && continue
  48         [ -d "${dev}/device" ] || continue
  49
  50         device="$(readlink "${dev}/device")"
  51         device="$(basename "$device")"
  52         irq_cpu="$(find_irq_cpu "$device")"
  53         irq_cpu_mask="$((1 << $irq_cpu))"
  54
  55         for q in ${dev}/queues/tx-*; do
  56                 set_hex_val "$q/xps_cpus" "$PROC_MASK"
  57         done
  58
  59         # ignore dsa slave ports for RPS
  60         subsys="$(readlink "${dev}/device/subsystem")"
  61         subsys="$(basename "$subsys")"
  62         [ "$subsys" = "mdio_bus" ] && continue
  63
  64         for q in ${dev}/queues/rx-*; do
  65                 set_hex_val "$q/rps_cpus" "$PROC_MASK"
  66         done
  67 done