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Thu, 26 Mar 2026 11:18:03 -0700 (PDT) From: Stephen Hemminger To: netdev@vger.kernel.org Cc: Victor Nogueira , Jamal Hadi Salim , Stephen Hemminger , Jiri Pirko , Shuah Khan , William Liu , Jakub Kicinski , Savino Dicanosa , linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v3 7/7] selftests/tc-testing: Add netem test case exercising loops Date: Thu, 26 Mar 2026 11:01:06 -0700 Message-ID: <20260326181701.308275-8-stephen@networkplumber.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260326181701.308275-1-stephen@networkplumber.org> References: <20260326181701.308275-1-stephen@networkplumber.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Victor Nogueira Add a netem nested duplicate test case to validate that it won't cause an infinite loop Acked-by: Jamal Hadi Salim Acked-by: Stephen Hemminger Signed-off-by: Victor Nogueira --- .../tc-testing/tc-tests/qdiscs/netem.json | 33 ++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/netem.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/netem.json index 3c4444961488..7c954989069d 100644 --- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/netem.json +++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/netem.json @@ -336,5 +336,36 @@ "teardown": [ "$TC qdisc del dev $DUMMY handle 1: root" ] - } + }, + { + "id": "8c17", + "name": "Test netem's recursive duplicate", + "category": [ + "qdisc", + "netem" + ], + "plugins": { + "requires": "nsPlugin" + }, + "setup": [ + "$IP link set dev $DUMMY up || true", + "$IP addr add 10.10.11.10/24 dev $DUMMY || true", + "$TC qdisc add dev $DUMMY root handle 1: netem limit 1 duplicate 100%", + "$TC qdisc add dev $DUMMY parent 1: handle 2: netem duplicate 100%" + ], + "cmdUnderTest": "ping -c 1 10.10.11.11 -W 0.01", + "expExitCode": "1", + "verifyCmd": "$TC -s -j qdisc ls dev $DUMMY root", + "matchJSON": [ + { + "kind": "netem", + "handle": "1:", + "bytes": 294, + "packets": 3 + } + ], + "teardown": [ + "$TC qdisc del dev $DUMMY handle 1: root" + ] + } ] -- 2.53.0