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selftests/tc-testing: Test CAKE scheduler when enqueue drops packets 

Add tests that trigger packet drops in cake_enqueue(): "CAKE with QFQ
Parent - CAKE enqueue with packets dropping". It forces CAKE_enqueue to
return NET_XMIT_CN after dropping the packets when it has a QFQ parent.

Signed-off-by: Xiang Mei <xmei5@asu.edu>
Reviewed-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20251128001415.377823-3-xmei5@asu.edu
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xiang Mei 2025-11-27 17:14:16 -07:00 committed by Paolo Abeni
parent 9fefc78f7f
commit 108f9405ce
1 changed files with 28 additions and 0 deletions
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28
tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
View File

@ -1005,5 +1005,33 @@
"teardown": [
"$TC qdisc del dev $DUMMY clsact"
]
},
{
"id": "4366",
"name": "CAKE with QFQ Parent - CAKE enqueue with packets dropping",
"category": [
"qdisc",
"cake",
"netem"
],
"plugins": {
"requires": "nsPlugin"
},
"setup":[
"$TC qdisc add dev $DUMMY handle 1: root qfq",
"$TC class add dev $DUMMY parent 1: classid 1:1 qfq maxpkt 1024",
"$TC qdisc add dev $DUMMY parent 1:1 handle 2: cake memlimit 9",
"$TC filter add dev $DUMMY protocol ip parent 1: prio 1 u32 match ip protocol 1 0xff flowid 1:1",
"ping -I$DUMMY -f -c1 -s64 -W1 10.10.10.1 || true",
"$TC qdisc replace dev $DUMMY parent 1:1 handle 3: netem delay 0ms"
],
"cmdUnderTest": "ping -I$DUMMY -f -c1 -s64 -W1 10.10.10.1 || true",
"expExitCode": "0",
"verifyCmd": "$TC -s qdisc show dev $DUMMY",
"matchPattern": "qdisc qfq 1:",
"matchCount": "1",
"teardown": [
"$TC qdisc del dev $DUMMY handle 1: root"
]
}
]