#!/bin/sh /etc/rc.common
# shellcheck disable=3043

START=40
USE_PROCD=1
NAME=skb_recycler

ucidef_set_skb_recycler() {
  uci import << EOF
package $NAME
config $NAME 'opt'
EOF

}

skb_recycler_config() {

  . /lib/config/uci.sh

  local CFG
  local max_skbs
  local max_spare_skbs
  local enable
  local memtotal
  CFG="$1"

  config_get max_skbs "${CFG}" max_skbs
  config_get max_spare_skbs "${CFG}" max_spare_skbs
  config_get enable "${CFG}" enable

  memtotal=$(awk '/MemTotal/{print $2}' /proc/meminfo)

  [ -z "$max_skbs" ] && {
    [ $memtotal -le 512000 ] && max_skbs=512 || max_skbs=1024
    uci_set $NAME "${CFG}" max_skbs "$max_skbs"
    uci_commit "$NAME"
  }

  [ -z "$max_spare_skbs" ] && {
    [ $memtotal -le 512000 ] && max_spare_skbs=128 || max_spare_skbs=256
    uci_set $NAME "${CFG}" max_spare_skbs "$max_spare_skbs"
    uci_commit "$NAME"
  }

  [ -z "$enable" ] && {
    [ $memtotal -le 256000 ] && enable=0 || enable=1
    uci_set $NAME "${CFG}" enable "$enable"
    uci_commit "$NAME"
  }

  [ "$enable" -eq 0 ] && enable_disable="Disabling" || enable_disable="Enabling"

  if [ -r "/proc/net/$NAME/skb_recycler_enable" ]; then
    logger -t "$NAME" -p user.notice "$enable_disable $NAME"
    echo "$enable" > /proc/net/$NAME/skb_recycler_enable
  else
    if [ "$enable" -eq 0 ]; then
      logger -t "$NAME" -p user.warn "$NAME kernel feature 'skb_recycler_enable' not available"
      logger -t "$NAME" -p user.notice "$enable_disable $NAME"
      echo 1 > /proc/net/$NAME/max_skbs
      echo 1 > /proc/net/$NAME/max_spare_skbs
      echo 1 > /proc/net/$NAME/flush
    fi
  fi

  logger -t "$NAME" -p user.notice "Setting max_skbs to $max_skbs"
  echo "$max_skbs" > /proc/net/$NAME/max_skbs

  logger -t "$NAME" -p user.notice "Setting max_spare_skbs to $max_spare_skbs"
  echo "$max_spare_skbs" > /proc/net/$NAME/max_spare_skbs

  [ "$enable" -eq 0 ] && echo 1 > /proc/net/$NAME/flush
}

check_config() {
  config_load "$NAME" || {
    touch /etc/config/$NAME
    ucidef_set_skb_recycler
  }
}

reload_service() {
  [ ! -r /proc/net/$NAME ] && logger -t "$NAME" -p user.warn "skb_recycler feature not available" && return

  check_config
  config_load $NAME
  config_foreach skb_recycler_config $NAME
}

start_service() {
  reload_service
}