package/network/config/netifd/files/usr/libexec/network/packet-steering.sh

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