From: Davide Caratti <dcaratti@redhat.com>
Date: Thu, 19 Mar 2026 18:40:56 +0000 (+0100)
Subject: tc-testing: add a test case for ETS offload
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5754a1c9f9b6e298791c4bb34263f37dfe93ee35;p=thirdparty%2Flinux.git

tc-testing: add a test case for ETS offload

While reviewing the fix for unintentional u32 overflows in ets offload
code, Jamal said:

 [...]

 > otherwise a tdc test should cover it fine (when you get to the
 > netdevsim change perhaps)

Extend tdc to allow setting hw-tc-offload via ethtool, and
add a test case to reproduce the division by zero fixed in [1].

[1] https://lore.kernel.org/all/CAM0EoMm17wsYZmdFLshH3_-GrZtzd=i0xnoO2yiVB=-N4761mw@mail.gmail.com/

Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Co-developed-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Link: https://patch.msgid.link/39129c374cbd00147b8c5afc04db59db62b50acc.1773945414.git.dcaratti@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json
index a5d94cdec6051..ee09e6d6fdf3c 100644
--- a/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json
+++ b/tools/testing/selftests/tc-testing/tc-tests/qdiscs/ets.json
@@ -984,5 +984,28 @@
         "matchCount": "1",
         "teardown": [
         ]
+    },
+    {
+        "id": "41f5",
+        "name": "ETS offload where the sum of quanta wraps u32",
+        "category": [
+            "qdisc",
+            "ets"
+        ],
+        "plugins": {
+            "requires": "nsPlugin"
+        },
+        "setup": [
+            "echo \"1 1 4\" > /sys/bus/netdevsim/new_device",
+            "$ETHTOOL -K $ETH hw-tc-offload on"
+        ],
+        "cmdUnderTest": "$TC qdisc add dev $ETH root ets quanta 4294967294 1 1",
+        "expExitCode": "0",
+        "verifyCmd": "$TC qdisc show dev $ETH",
+        "matchPattern": "qdisc ets .*bands 3 quanta 4294967294 1 1",
+        "matchCount": "1",
+        "teardown": [
+            "echo \"1\" > /sys/bus/netdevsim/del_device"
+        ]
     }
 ]
diff --git a/tools/testing/selftests/tc-testing/tdc.py b/tools/testing/selftests/tc-testing/tdc.py
index 4f255cec0c22e..81b4ac3f050c3 100755
--- a/tools/testing/selftests/tc-testing/tdc.py
+++ b/tools/testing/selftests/tc-testing/tdc.py
@@ -755,6 +755,9 @@ def check_default_settings(args, remaining, pm):
         NAMES['DEV2'] = args.device
     if 'TIMEOUT' not in NAMES:
         NAMES['TIMEOUT'] = None
+    if 'ETHTOOL' in NAMES and not os.path.isfile(NAMES['ETHTOOL']):
+        print(f"The specified ethtool path {NAMES['ETHTOOL']} does not exist.")
+        exit(1)
     if not os.path.isfile(NAMES['TC']):
         print("The specified tc path " + NAMES['TC'] + " does not exist.")
         exit(1)
diff --git a/tools/testing/selftests/tc-testing/tdc_config.py b/tools/testing/selftests/tc-testing/tdc_config.py
index ccb0f06ef9e3a..9488b03cbc2c8 100644
--- a/tools/testing/selftests/tc-testing/tdc_config.py
+++ b/tools/testing/selftests/tc-testing/tdc_config.py
@@ -17,6 +17,7 @@ NAMES = {
           'DEV1': 'v0p1',
           'DEV2': '',
           'DUMMY': 'dummy1',
+          'ETHTOOL': '/usr/sbin/ethtool',
 	  'ETH': 'eth0',
           'BATCH_FILE': './batch.txt',
           'BATCH_DIR': 'tmp',