netdev - [PATCH net 3/3] selftests/tc-testing: Try to add teql as a child qdisc

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Message-Id: <20260114160243.913069-4-jhs@mojatatu.com>
Date: Wed, 14 Jan 2026 11:02:43 -0500
From: Jamal Hadi Salim <jhs@...atatu.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	andrew+netdev@...n.ch
Cc: netdev@...r.kernel.org,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	victor@...atatu.com,
	km.kim1503@...il.com,
	security@...nel.org
Subject: [PATCH net 3/3] selftests/tc-testing: Try to add teql as a child qdisc

From: Victor Nogueira <victor@...atatu.com>

Add a selftest that attempts to add a teql qdisc as a qfq child.
Since teql _must_ be added as a root qdisc, the kernel should reject
this.

Signed-off-by: Victor Nogueira <victor@...atatu.com>
---
 .../tc-testing/tc-tests/qdiscs/teql.json      | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/teql.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/teql.json
index e5cc31f265f8..0179c57104ad 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/teql.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/teql.json
@@ -81,5 +81,30 @@
             "$TC qdisc del dev $DUMMY handle 1: root",
             "$IP link del dev $DUMMY"
         ]
+    },
+    {
+        "id": "124e",
+        "name": "Try to add teql as a child qdisc",
+        "category": [
+            "qdisc",
+            "ets",
+            "tbf"
+        ],
+        "plugins": {
+            "requires": [
+                "nsPlugin"
+            ]
+        },
+        "setup": [
+            "$TC qdisc add dev $DUMMY root handle 1: qfq",
+            "$TC class add dev $DUMMY parent 1: classid 1:1 qfq weight 15 maxpkt 16384"
+        ],
+        "cmdUnderTest": "$TC qdisc add dev $DUMMY parent 1:1 handle 2:1 teql0",
+        "expExitCode": "2",
+        "verifyCmd": "$TC -s -j qdisc ls dev $DUMMY parent 1:1",
+        "matchJSON": [],
+        "teardown": [
+            "$TC qdisc del dev $DUMMY root handle 1:"
+        ]
     }
 ]
-- 
2.34.1