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selftests/tc-testing: Add an HFSC qlen accounting test

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This test reproduces a scenario where HFSC queue length and backlog accounting
can become inconsistent when a peek operation triggers a dequeue and possible
drop before the parent qdisc updates its counters. The test sets up a DRR root
qdisc with an HFSC class, netem, and blackhole children, and uses Scapy to
inject a packet. It helps to verify that HFSC correctly tracks qlen and backlog
even when packets are dropped during peek-induced dequeue.

Cc: Mingi Cho <mincho@theori.io>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250518222038.58538-3-xiyou.wangcong@gmail.com
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Cong Wang 2025-05-18 15:20:38 -07:00 • committed by Paolo Abeni
parent 3f98113810
commit c3572acffb
1 changed files with 27 additions and 0 deletions
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27
tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
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@ -573,5 +573,32 @@
"teardown": [
"$TC qdisc del dev $DEV1 handle 1: root"
]
},
{
"id": "831d",
"name": "Test HFSC qlen accounting with DRR/NETEM/BLACKHOLE chain",
"category": ["qdisc", "hfsc", "drr", "netem", "blackhole"],
"plugins": { "requires": ["nsPlugin", "scapyPlugin"] },
"setup": [
"$IP link set dev $DEV1 up || true",
"$TC qdisc add dev $DEV1 root handle 1: drr",
"$TC filter add dev $DEV1 parent 1: basic classid 1:1",
"$TC class add dev $DEV1 parent 1: classid 1:1 drr",
"$TC qdisc add dev $DEV1 parent 1:1 handle 2: hfsc def 1",
"$TC class add dev $DEV1 parent 2: classid 2:1 hfsc rt m1 8 d 1 m2 0",
"$TC qdisc add dev $DEV1 parent 2:1 handle 3: netem",
"$TC qdisc add dev $DEV1 parent 3:1 handle 4: blackhole"
],
"scapy": {
"iface": "$DEV0",
"count": 5,
"packet": "Ether()/IP(dst='10.10.10.1', src='10.10.10.10')/ICMP()"
},
"cmdUnderTest": "$TC -s qdisc show dev $DEV1",
"expExitCode": "0",
"verifyCmd": "$TC -s qdisc show dev $DEV1",
"matchPattern": "qdisc hfsc",
"matchCount": "1",
"teardown": ["$TC qdisc del dev $DEV1 root handle 1: drr"]
}
]