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selftests/tc-testing: Add a test case for FQ_CODEL with DRR parent

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Add a test case for FQ_CODEL with DRR parent to verify packet drop
behavior when the queue becomes empty. This helps ensure proper
notification mechanisms between qdiscs.

Note this is best-effort, it is hard to play with those parameters
perfectly to always trigger ->qlen_notify().

Cc: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Link: https://patch.msgid.link/20250403211636.166257-5-xiyou.wangcong@gmail.com
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Cong Wang
2025-04-03 14:16:35 -07:00
committed by Paolo Abeni
parent 72b05c1bf7
commit 0d5c27ecb6
1 changed files with 31 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
View File

@@ -251,5 +251,36 @@
"$TC qdisc del dev $DUMMY handle 1: root",
"$IP addr del 10.10.10.10/24 dev $DUMMY || true"
]
},
{
"id": "a4c0",
"name": "Test FQ_CODEL with DRR parent - force packet drop with empty queue",
"category": [
"qdisc",
"fq_codel",
"drr"
],
"plugins": {
"requires": "nsPlugin"
},
"setup": [
"$IP link set dev $DUMMY up || true",
"$IP addr add 10.10.10.10/24 dev $DUMMY || true",
"$TC qdisc add dev $DUMMY handle 1: root drr",
"$TC class add dev $DUMMY parent 1: classid 1:10 drr quantum 1500",
"$TC qdisc add dev $DUMMY parent 1:10 handle 10: fq_codel memory_limit 1 flows 1 target 0.1ms interval 1ms",
"$TC filter add dev $DUMMY parent 1: protocol ip prio 1 u32 match ip protocol 1 0xff flowid 1:10",
"ping -c 5 -f -I $DUMMY 10.10.10.1 > /dev/null || true",
"sleep 0.1"
],
"cmdUnderTest": "$TC -s qdisc show dev $DUMMY",
"expExitCode": "0",
"verifyCmd": "$TC -s qdisc show dev $DUMMY | grep -A 5 'qdisc fq_codel'",
"matchPattern": "dropped [1-9][0-9]*",
"matchCount": "1",
"teardown": [
"$TC qdisc del dev $DUMMY handle 1: root",
"$IP addr del 10.10.10.10/24 dev $DUMMY || true"
]
}
]