1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# Verify that FQ has a packet limit per band: 5# 6# 1. set the limit to 10 per band 7# 2. send 20 pkts on band A: verify that 10 are queued, 10 dropped 8# 3. send 20 pkts on band A: verify that 0 are queued, 20 dropped 9# 4. send 20 pkts on band B: verify that 10 are queued, 10 dropped 10# 11# Send packets with a delay to ensure that previously sent 12# packets are still queued when later ones are sent. 13# Use SO_TXTIME for this. 14 15die() { 16 echo "$1" 17 exit 1 18} 19 20# run inside private netns 21if [[ $# -eq 0 ]]; then 22 ./in_netns.sh "$0" __subprocess 23 exit 24fi 25 26ip link add type dummy 27ip link set dev dummy0 up 28ip -6 addr add fdaa::1/128 dev dummy0 29ip -6 route add fdaa::/64 dev dummy0 30tc qdisc replace dev dummy0 root handle 1: fq quantum 1514 initial_quantum 1514 limit 10 31 32DELAY=400000 33 34./cmsg_sender -6 -p u -d "${DELAY}" -n 20 fdaa::2 8000 35OUT1="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" 36 37./cmsg_sender -6 -p u -d "${DELAY}" -n 20 fdaa::2 8000 38OUT2="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" 39 40./cmsg_sender -6 -p u -d "${DELAY}" -n 20 -P 7 fdaa::2 8000 41OUT3="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" 42 43# Initial stats will report zero sent, as all packets are still 44# queued in FQ. Sleep for at least the delay period and see that 45# twenty are now sent. 46sleep 0.6 47OUT4="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" 48 49# Log the output after the test 50echo "${OUT1}" 51echo "${OUT2}" 52echo "${OUT3}" 53echo "${OUT4}" 54 55# Test the output for expected values 56echo "${OUT1}" | grep -q '0\ pkt\ (dropped\ 10' || die "unexpected drop count at 1" 57echo "${OUT2}" | grep -q '0\ pkt\ (dropped\ 30' || die "unexpected drop count at 2" 58echo "${OUT3}" | grep -q '0\ pkt\ (dropped\ 40' || die "unexpected drop count at 3" 59echo "${OUT4}" | grep -q '20\ pkt\ (dropped\ 40' || die "unexpected accept count at 4" 60