From: William Liu <will@willsroot.io>
To: netdev@vger.kernel.org
Cc: jhs@mojatatu.com, xiyou.wangcong@gmail.com, pabeni@redhat.com,
kuba@kernel.org, jiri@resnulli.us, davem@davemloft.net,
edumazet@google.com, horms@kernel.org, savy@syst3mfailure.io,
victor@mojatatu.com, William Liu <will@willsroot.io>
Subject: [PATCH net v5 2/2] selftests/tc-testing: Check backlog stats in gso_skb case
Date: Tue, 12 Aug 2025 23:58:26 +0000 [thread overview]
Message-ID: <20250812235808.45281-1-will@willsroot.io> (raw)
In-Reply-To: <20250812235725.45243-1-will@willsroot.io>
Add tests to ensure proper backlog accounting in hhf, codel, pie, fq,
fq_pie, and fq_codel qdiscs. We check for the bug pattern originally
found in fq, fq_pie, and fq_codel, which was an underflow in the tbf
parent backlog stats upon child qdisc removal.
Signed-off-by: William Liu <will@willsroot.io>
Reviewed-by: Savino Dicanosa <savy@syst3mfailure.io>
---
v3 -> v4:
- Unify tests to check against underflow in tbf stats on purge
v2 -> v3:
- Simplify ping command in test cases
- Remove scapyPlugin dependency
---
.../tc-testing/tc-tests/infra/qdiscs.json | 198 ++++++++++++++++++
1 file changed, 198 insertions(+)
diff --git a/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json b/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
index 23a61e5b99d0..998e5a2f4579 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/infra/qdiscs.json
@@ -185,6 +185,204 @@
"$IP addr del 10.10.10.10/24 dev $DUMMY || true"
]
},
+ {
+ "id": "34c0",
+ "name": "Test TBF with HHF Backlog Accounting in gso_skb case against underflow",
+ "category": [
+ "qdisc",
+ "tbf",
+ "hhf"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
+ "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 hhf limit 1000",
+ [
+ "ping -I $DUMMY -c2 10.10.11.11",
+ 1
+ ],
+ "$TC qdisc change dev $DUMMY handle 2: parent 1:1 hhf limit 1"
+ ],
+ "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 2: parent 1:1",
+ "expExitCode": "0",
+ "verifyCmd": "$TC -s qdisc show dev $DUMMY",
+ "matchPattern": "backlog 0b 0p",
+ "matchCount": "1",
+ "teardown": [
+ "$TC qdisc del dev $DUMMY handle 1: root"
+ ]
+ },
+ {
+ "id": "fd68",
+ "name": "Test TBF with CODEL Backlog Accounting in gso_skb case against underflow",
+ "category": [
+ "qdisc",
+ "tbf",
+ "codel"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
+ "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 codel limit 1000",
+ [
+ "ping -I $DUMMY -c2 10.10.11.11",
+ 1
+ ],
+ "$TC qdisc change dev $DUMMY handle 2: parent 1:1 codel limit 1"
+ ],
+ "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 2: parent 1:1",
+ "expExitCode": "0",
+ "verifyCmd": "$TC -s qdisc show dev $DUMMY",
+ "matchPattern": "backlog 0b 0p",
+ "matchCount": "1",
+ "teardown": [
+ "$TC qdisc del dev $DUMMY handle 1: root"
+ ]
+ },
+ {
+ "id": "514e",
+ "name": "Test TBF with PIE Backlog Accounting in gso_skb case against underflow",
+ "category": [
+ "qdisc",
+ "tbf",
+ "pie"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
+ "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 pie limit 1000",
+ [
+ "ping -I $DUMMY -c2 10.10.11.11",
+ 1
+ ],
+ "$TC qdisc change dev $DUMMY handle 2: parent 1:1 pie limit 1"
+ ],
+ "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 2: parent 1:1",
+ "expExitCode": "0",
+ "verifyCmd": "$TC -s qdisc show dev $DUMMY",
+ "matchPattern": "backlog 0b 0p",
+ "matchCount": "1",
+ "teardown": [
+ "$TC qdisc del dev $DUMMY handle 1: root"
+ ]
+ },
+ {
+ "id": "6c97",
+ "name": "Test TBF with FQ Backlog Accounting in gso_skb case against underflow",
+ "category": [
+ "qdisc",
+ "tbf",
+ "fq"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
+ "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 fq limit 1000",
+ [
+ "ping -I $DUMMY -c2 10.10.11.11",
+ 1
+ ],
+ "$TC qdisc change dev $DUMMY handle 2: parent 1:1 fq limit 1"
+ ],
+ "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 2: parent 1:1",
+ "expExitCode": "0",
+ "verifyCmd": "$TC -s qdisc show dev $DUMMY",
+ "matchPattern": "backlog 0b 0p",
+ "matchCount": "1",
+ "teardown": [
+ "$TC qdisc del dev $DUMMY handle 1: root"
+ ]
+ },
+ {
+ "id": "5d0b",
+ "name": "Test TBF with FQ_CODEL Backlog Accounting in gso_skb case against underflow",
+ "category": [
+ "qdisc",
+ "tbf",
+ "fq_codel"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
+ "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 fq_codel limit 1000",
+ [
+ "ping -I $DUMMY -c2 10.10.11.11",
+ 1
+ ],
+ "$TC qdisc change dev $DUMMY handle 2: parent 1:1 fq_codel limit 1"
+ ],
+ "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 2: parent 1:1",
+ "expExitCode": "0",
+ "verifyCmd": "$TC -s qdisc show dev $DUMMY",
+ "matchPattern": "backlog 0b 0p",
+ "matchCount": "1",
+ "teardown": [
+ "$TC qdisc del dev $DUMMY handle 1: root"
+ ]
+ },
+ {
+ "id": "21c3",
+ "name": "Test TBF with FQ_PIE Backlog Accounting in gso_skb case against underflow",
+ "category": [
+ "qdisc",
+ "tbf",
+ "fq_pie"
+ ],
+ "plugins": {
+ "requires": [
+ "nsPlugin"
+ ]
+ },
+ "setup": [
+ "$IP link set dev $DUMMY up || true",
+ "$IP addr add 10.10.11.10/24 dev $DUMMY || true",
+ "$TC qdisc add dev $DUMMY root handle 1: tbf rate 8bit burst 100b latency 100ms",
+ "$TC qdisc replace dev $DUMMY handle 2: parent 1:1 fq_pie limit 1000",
+ [
+ "ping -I $DUMMY -c2 10.10.11.11",
+ 1
+ ],
+ "$TC qdisc change dev $DUMMY handle 2: parent 1:1 fq_pie limit 1"
+ ],
+ "cmdUnderTest": "$TC qdisc del dev $DUMMY handle 2: parent 1:1",
+ "expExitCode": "0",
+ "verifyCmd": "$TC -s qdisc show dev $DUMMY",
+ "matchPattern": "backlog 0b 0p",
+ "matchCount": "1",
+ "teardown": [
+ "$TC qdisc del dev $DUMMY handle 1: root"
+ ]
+ },
{
"id": "a4bb",
"name": "Test FQ_CODEL with HTB parent - force packet drop with empty queue",
--
2.43.0
next prev parent reply other threads:[~2025-08-12 23:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-12 23:57 [PATCH net v5 1/2] net/sched: Fix backlog accounting in qdisc_dequeue_internal William Liu
2025-08-12 23:58 ` William Liu [this message]
2025-08-15 1:30 ` patchwork-bot+netdevbpf
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