tools/testing/selftests/net/fq_band_pktlimit.sh

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