name : fq_band_pktlimit.sh #!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Verify that FQ has a packet limit per band: # # 1. set the limit to 10 per band # 2. send 20 pkts on band A: verify that 10 are queued, 10 dropped # 3. send 20 pkts on band A: verify that 0 are queued, 20 dropped # 4. send 20 pkts on band B: verify that 10 are queued, 10 dropped # # Send packets with a 100ms delay to ensure that previously sent # packets are still queued when later ones are sent. # Use SO_TXTIME for this. die() { echo "$1" exit 1 } # run inside private netns if [[ $# -eq 0 ]]; then ./in_netns.sh "$0" __subprocess exit fi ip link add type dummy ip link set dev dummy0 up ip -6 addr add fdaa::1/128 dev dummy0 ip -6 route add fdaa::/64 dev dummy0 tc qdisc replace dev dummy0 root handle 1: fq quantum 1514 initial_quantum 1514 limit 10 ./cmsg_sender -6 -p u -d 100000 -n 20 fdaa::2 8000 OUT1="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" ./cmsg_sender -6 -p u -d 100000 -n 20 fdaa::2 8000 OUT2="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" ./cmsg_sender -6 -p u -d 100000 -n 20 -P 7 fdaa::2 8000 OUT3="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" # Initial stats will report zero sent, as all packets are still # queued in FQ. Sleep for the delay period (100ms) and see that # twenty are now sent. sleep 0.1 OUT4="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')" # Log the output after the test echo "${OUT1}" echo "${OUT2}" echo "${OUT3}" echo "${OUT4}" # Test the output for expected values echo "${OUT1}" | grep -q '0\ pkt\ (dropped\ 10' || die "unexpected drop count at 1" echo "${OUT2}" | grep -q '0\ pkt\ (dropped\ 30' || die "unexpected drop count at 2" echo "${OUT3}" | grep -q '0\ pkt\ (dropped\ 40' || die "unexpected drop count at 3" echo "${OUT4}" | grep -q '20\ pkt\ (dropped\ 40' || die "unexpected accept count at 4"