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This test validates per-band packet limits in FQ. Packets are dropped rather than enqueued if the limit for their band is reached. This test is timing sensitive. It queues packets in FQ with a future delivery time to fill the qdisc. The test failed in a virtual environment (vng). Increase the delays to make it more tolerant to environments with timing variance. Signed-off-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
59 lines
1.8 KiB
Bash
Executable file
59 lines
1.8 KiB
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Verify that FQ has a packet limit per band:
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#
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# 1. set the limit to 10 per band
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# 2. send 20 pkts on band A: verify that 10 are queued, 10 dropped
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# 3. send 20 pkts on band A: verify that 0 are queued, 20 dropped
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# 4. send 20 pkts on band B: verify that 10 are queued, 10 dropped
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#
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# Send packets with a delay to ensure that previously sent
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# packets are still queued when later ones are sent.
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# Use SO_TXTIME for this.
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die() {
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echo "$1"
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exit 1
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}
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# run inside private netns
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if [[ $# -eq 0 ]]; then
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./in_netns.sh "$0" __subprocess
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exit
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fi
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ip link add type dummy
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ip link set dev dummy0 up
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ip -6 addr add fdaa::1/128 dev dummy0
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ip -6 route add fdaa::/64 dev dummy0
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tc qdisc replace dev dummy0 root handle 1: fq quantum 1514 initial_quantum 1514 limit 10
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DELAY=400000
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./cmsg_sender -6 -p u -d "${DELAY}" -n 20 fdaa::2 8000
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OUT1="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
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./cmsg_sender -6 -p u -d "${DELAY}" -n 20 fdaa::2 8000
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OUT2="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
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./cmsg_sender -6 -p u -d "${DELAY}" -n 20 -P 7 fdaa::2 8000
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OUT3="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
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# Initial stats will report zero sent, as all packets are still
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# queued in FQ. Sleep for at least the delay period and see that
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# twenty are now sent.
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sleep 0.6
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OUT4="$(tc -s qdisc show dev dummy0 | grep '^\ Sent')"
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# Log the output after the test
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echo "${OUT1}"
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echo "${OUT2}"
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echo "${OUT3}"
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echo "${OUT4}"
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# Test the output for expected values
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echo "${OUT1}" | grep -q '0\ pkt\ (dropped\ 10' || die "unexpected drop count at 1"
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echo "${OUT2}" | grep -q '0\ pkt\ (dropped\ 30' || die "unexpected drop count at 2"
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echo "${OUT3}" | grep -q '0\ pkt\ (dropped\ 40' || die "unexpected drop count at 3"
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echo "${OUT4}" | grep -q '20\ pkt\ (dropped\ 40' || die "unexpected accept count at 4"
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