From 18c889a9a419dc1662548777b7122d980bccfdad Mon Sep 17 00:00:00 2001
From: =?utf8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
Date: Thu, 10 Apr 2025 12:43:21 +0200
Subject: [PATCH] selftests/tc-testing: Add test for echo of big TC filters
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Add a selftest that checks whether the kernel can successfully echo a
big tc filter, to test the fix introduced in commit:

369609fc6272 ("tc: Ensure we have enough buffer space when sending filter netlink notifications")

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Tested-by: Victor Nogueira <victor@mojatatu.com>
Link: https://patch.msgid.link/20250410104322.214620-1-toke@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 .../tc-testing/tc-tests/infra/actions.json    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/tools/testing/selftests/tc-testing/tc-tests/infra/actions.json b/tools/testing/selftests/tc-testing/tc-tests/infra/actions.json
index 1ba96c4677548..d9fc62ab476c9 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/infra/actions.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/infra/actions.json
@@ -412,5 +412,27 @@
         "teardown": [
             "$TC qdisc del dev $DUMMY ingress"
         ]
+    },
+    {
+        "id": "33f4",
+        "name": "Check echo of big filter command",
+        "category": [
+            "infra",
+            "u32"
+        ],
+        "plugins": {
+            "requires": "nsPlugin"
+        },
+        "setup": [
+            "$TC qdisc add dev $DUMMY parent root handle 10: fq_codel"
+        ],
+        "cmdUnderTest": "bash -c '$TC -echo filter add dev $DUMMY parent 10: u32 match u32 0 0 $(for i in $(seq 32); do echo action pedit munge ip dport set 22; done) | grep \"added filter\"'",
+        "verifyCmd": "",
+        "expExitCode": "0",
+        "matchCount": "0",
+        "matchPattern": "",
+        "teardown": [
+            "$TC qdisc del dev $DUMMY parent root fq_codel"
+        ]
     }
 ]
-- 
2.39.5