netdev - [Patch net 2/4] Add test case to check for pfifo_tail

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Message-Id: <20250124060740.356527-3-xiyou.wangcong@gmail.com>
Date: Thu, 23 Jan 2025 22:07:38 -0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: jhs@...atatu.com,
	jiri@...nulli.us,
	quanglex97@...il.com,
	mincho@...ori.io,
	Cong Wang <cong.wang@...edance.com>
Subject: [Patch net 2/4] Add test case to check for pfifo_tail_enqueue() behaviour when limit == 0

From: Quang Le <quanglex97@...il.com>

When limit == 0, pfifo_tail_enqueue() must drop new packet and
increase dropped packets count of scheduler.

Signed-off-by: Quang Le <quanglex97@...il.com>
Signed-off-by: Cong Wang <cong.wang@...edance.com>
---
 .../tc-testing/tc-tests/qdiscs/fifo.json      | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/fifo.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/fifo.json
index ae3d286a32b2..f5e08ae9bb7d 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/fifo.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/fifo.json
@@ -313,6 +313,31 @@
         "matchPattern": "qdisc bfifo 1: root",
         "matchCount": "0",
         "teardown": [
+	]
+    },
+    {
+        "id": "d774",
+        "name": "Check pfifo_head_drop qdisc enqueue behaviour when limit == 0",
+        "category": [
+            "qdisc",
+            "pfifo_head_drop"
+        ],
+        "plugins": {
+            "requires": "nsPlugin"
+        },
+        "setup": [
+            "$IP link add dev dummy2 mtu 1279 type dummy || true",
+            "$IP addr add 10.10.10.10/24 dev dummy2 || true",
+            "$TC qdisc add dev dummy2 root handle 1: pfifo_head_drop limit 0",
+            "$IP link set dev dummy2 up || true"
+        ],
+        "cmdUnderTest": "ping -c10 -W0.01 -I dummy2 10.10.10.1",
+        "expExitCode": "1",
+        "verifyCmd": "$TC -s qdisc show dev dummy2",
+        "matchPattern": "dropped 10",
+        "matchCount": "1",
+        "teardown": [
+            "$IP link del dev dummy2"
         ]
     }
 ]
-- 
2.34.1