net_qdisc_nfs_low

#! /bin/bash

set -e

. /etc/local/mxhost.conf

case "$1" in
	start)
		tc qdisc add dev $MX_NETDEV root        handle 10: prio
		tc qdisc add dev $MX_NETDEV parent 10:1 handle 20: sfq # band 0 highest priority
		tc qdisc add dev $MX_NETDEV parent 10:2 handle 30: sfq # band 2
		tc qdisc add dev $MX_NETDEV parent 10:3 handle 40: sfq # band 3

		tc filter add dev $MX_NETDEV parent 10: handle 100: protocol ip prio 4 u32 divisor 1
		tc filter add dev $MX_NETDEV parent 10: handle 100:0:1 protocol ip prio 4 u32 ht 100: match tcp dst 2049 FFFF flowid 10:2

		# The "root filter list is always 800:0.
		# "match ip firstfrag" compiles to "match 00002000/00003fff at 4" which
		# includes the "more fragments" flag, so only initial fragments of a
		# fragmented packet would be selected, not single fragments of an
		# unfragmented packet. So use "match u32 00000000 00001fff at 4" to
		# make sure, this is a initial segment and has a tcp header.

		tc filter add dev $MX_NETDEV parent 10: handle 800:0:1 protocol ip prio 4 u32 ht 800: \
			match ip protocol 06 ff \
			match u32 00000000 00001fff at 4 \
			offset at 0 mask 0f00 shift 6 \
			link 100:
		tc filter add dev $MX_NETDEV parent 10: handle 800:0:2 protocol ip prio 4 u32 ht 800: match u32 0 0 flowid 10:1
		;;
	stop)
		tc filter delete dev $MX_NETDEV
		tc qdisc delete dev $MX_NETDEV root
		;;
	restart)
		$0 stop
		$0 start
		;;
	status)
		tc -s qdisc show dev $MX_NETDEV
		tc -s filter show dev $MX_NETDEV
		;;
	*)
		echo "usage: $0 { start | stop | restart | status }" >&2
		exit 1
esac