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Tue, 9 Sep 2025 03:14:55 -0700 From: Carolina Jubran To: Shuah Khan , Andrew Lunn , "David S . Miller" , Eric Dumazet , "Jakub Kicinski" , Paolo Abeni , Simon Horman CC: Gal Pressman , Tariq Toukan , "Cosmin Ratiu" , Nimrod Oren , Mark Bloch , , , Subject: [PATCH v2 net 1/2] selftests: drv-net: Fix and clarify TC bandwidth split in devlink_rate_tc_bw.py Date: Tue, 9 Sep 2025 13:13:52 +0300 Message-ID: <20250909101353.3778751-2-cjubran@nvidia.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20250909101353.3778751-1-cjubran@nvidia.com> References: <20250909101353.3778751-1-cjubran@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECD5:EE_|PH0PR12MB5647:EE_ X-MS-Office365-Filtering-Correlation-Id: fa719e32-7c5a-4ac7-e535-08ddef89ca67 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?+dLF+ujQaVAfgmsql4HjJKYXEaXcYVWpquxxVeof3Ero+eVm8r2jVcMyOr5C?= =?us-ascii?Q?46yowEuD6cHtftxQzWPjI0oQU+Ql1zEzRXaeFin+ZtleaTINP7VfTrL0t3ev?= =?us-ascii?Q?NH0Tr7caTqhfZ53YuREZYVGHRouGuT348U4Xr0GJ9Uj6gChd4KsOSxfR8Lka?= =?us-ascii?Q?ndQzI+GJTrQa61MSUlcQUAY354P/zkoxGFPYpUMQDTyvnbp2EMvOfPLy/69J?= =?us-ascii?Q?aMnpWTuz1PrkvSl8FD5Z9yHaNr4kgAvTd1k17RpmlIN/9t/zq/GEOsc6q96a?= =?us-ascii?Q?TtM7JdRWCeUikH/0IJALg+OLznLjsUOAUgr/eeXSmMRWRLFO3DkhZK7E13/E?= =?us-ascii?Q?LPcYtzNIE+/SgNzgsFE3HicLHq6X9ZdO1bDoNt9wxumKislrrUKyw1ObrfvL?= =?us-ascii?Q?gEo0u+O2BJN2rflIvXV0JLB5l5RMDGaLNoMTLTYHNDjaGYiLmnFUclHL8Cvt?= =?us-ascii?Q?Uhdnit0rbTlCcElcwFH+ls+WVxQLQKGKduFP7SELbvMDArMr4l9EpzWVEPoX?= =?us-ascii?Q?IZ4NE3Aj1m6lXjVa/obcl3NAaE7KieVxIJU4mSxIXI4QQ2Wwd5iR8YimckS0?= =?us-ascii?Q?xdbtb+if7eNpgevIA3oBF/GIhyQRJI6sadqo+2Wmv4APKuhnFje6RipD0Zye?= =?us-ascii?Q?jxaX0+W5cPVCGtDSSAS+ZHsHlSrRdSRuZbTpFPwrbpXTeL4j/L7guXAuf8UW?= =?us-ascii?Q?namLlp5LgXZB65ZDPP/txOen5l8M+ovDEmyJjs0zu78OvgQW3wAhk9L9MKc9?= =?us-ascii?Q?ajI5ZPAPwA2t73Lx3+GT/rXrtVj+7N/s7ruwQ5nBhNVpUZRq+7zeKRIJmQ/B?= =?us-ascii?Q?j+0bcGuMZ3hRWyuj5vVQAH3rSd8iEWq9cAy+0x8l87y3qUTzW+hLDKRLpFnj?= =?us-ascii?Q?/0iTlGnhqqP76dQ9Ca4tro8n5IdP3EZLNidhONHMqwVIVPq8hhnAJd446gbU?= =?us-ascii?Q?0MHqvkEp1ePaPepFyF75vmWEILBIq2RuY/7DrbrasLJYH4f+lj8cVTy5pE//?= =?us-ascii?Q?+df5xUsd6N8TThC3le/APlkOQ578260hjrWzZcUg2lMP6QIK8wKDa3BCvTyz?= =?us-ascii?Q?tGidJ2pVRR2Vh7hj3hmAPTRHruzUwDPo0WLOeVVrpE0hy8pNq9Crzl74hJ28?= =?us-ascii?Q?ECi8mw49SUCA1dX0pS4GcB1ThlPZYpJ4qUhmohwRPDSkh/cnfPKjydaLGVQy?= =?us-ascii?Q?/VcZ5Kc5Us5gXcF1QV1BZRT53txGYsyqUJlgbvdu6qbjUzNgffTphxRGnArW?= =?us-ascii?Q?G268B9BQMJwlbQ6Oh4MkZg3mL/CmrbE8UmKvopvJ246ab+ocfHEzi3qHmeiC?= =?us-ascii?Q?xlzlI2nY+2f1YL1Lzkn+sh4D0NIvk+80vEokut7gaPAXeQTnvySDTbGDo3V5?= =?us-ascii?Q?9mJdfw/tQ5GLfSILTLQWKETEmtB9qXd5UCOmGbO0pxv9inBJ5g28FawWASGV?= =?us-ascii?Q?KCBc+RdHOLAnu+k+OEBe0kkP9dDfxZKSkftF/ZtOnRmDPCu7QOW7b/1RNyo4?= =?us-ascii?Q?Et1G9R2I+oWLWYc7OxDNKGf8YinpfzOWmm5V?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Sep 2025 10:15:24.0590 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fa719e32-7c5a-4ac7-e535-08ddef89ca67 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000ECD5.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB5647 Content-Type: text/plain; charset="utf-8" Correct the documented bandwidth distribution between TC3 and TC4 from 80/20 to 20/80. Update test descriptions and printed messages to consistently reflect the intended split. Fixes: 23ca32e4ead4 ("selftests: drv-net: Add test for devlink-rate traffic= class bandwidth distribution") Tested-by: Carolina Jubran Signed-off-by: Carolina Jubran Reviewed-by: Cosmin Ratiu Reviewed-by: Nimrod Oren Reviewed-by: Simon Horman --- .../drivers/net/hw/devlink_rate_tc_bw.py | 26 +++++++++---------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py b= /tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py index ead6784d1910..4da91e3292bf 100755 --- a/tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py +++ b/tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py @@ -21,21 +21,21 @@ Test Cases: ---------- 1. test_no_tc_mapping_bandwidth: - Verifies that without TC mapping, bandwidth is NOT distributed accord= ing to - the configured 80/20 split between TC4 and TC3 - - This test should fail if bandwidth matches the 80/20 split without TC + the configured 20/80 split between TC3 and TC4 + - This test should fail if bandwidth matches the 20/80 split without TC mapping - - Expected: Bandwidth should NOT be distributed as 80/20 + - Expected: Bandwidth should NOT be distributed as 20/80 =20 2. test_tc_mapping_bandwidth: - Configures TC mapping using mqprio qdisc - Verifies that with TC mapping, bandwidth IS distributed according to = the - configured 80/20 split between TC3 and TC4 - - Expected: Bandwidth should be distributed as 80/20 + configured 20/80 split between TC3 and TC4 + - Expected: Bandwidth should be distributed as 20/80 =20 Bandwidth Distribution: ---------------------- -- TC3 (VLAN 101): Configured for 80% of total bandwidth -- TC4 (VLAN 102): Configured for 20% of total bandwidth +- TC3 (VLAN 101): Configured for 20% of total bandwidth +- TC4 (VLAN 102): Configured for 80% of total bandwidth - Total bandwidth: 1Gbps - Tolerance: +-12% =20 @@ -413,10 +413,10 @@ def run_bandwidth_distribution_test(cfg, set_tc_mappi= ng): =20 def test_no_tc_mapping_bandwidth(cfg): """ - Verifies that bandwidth is not split 80/20 without traffic class mappi= ng. + Verifies that bandwidth is not split 20/80 without traffic class mappi= ng. """ - pass_bw_msg =3D "Bandwidth is NOT distributed as 80/20 without TC mapp= ing" - fail_bw_msg =3D "Bandwidth matched 80/20 split without TC mapping" + pass_bw_msg =3D "Bandwidth is NOT distributed as 20/80 without TC mapp= ing" + fail_bw_msg =3D "Bandwidth matched 20/80 split without TC mapping" is_mlx5 =3D "driver: mlx5" in ethtool(f"-i {cfg.ifname}").stdout =20 if run_bandwidth_distribution_test(cfg, set_tc_mapping=3DFalse): @@ -430,13 +430,13 @@ def test_no_tc_mapping_bandwidth(cfg): =20 def test_tc_mapping_bandwidth(cfg): """ - Verifies that bandwidth is correctly split 80/20 between TC3 and TC4 + Verifies that bandwidth is correctly split 20/80 between TC3 and TC4 when traffic class mapping is set. 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Update BandwidthValidator to take a dict of shares and compute bounds relative to the overall total, so that all shares are validated consistently. Fixes: 23ca32e4ead4 ("selftests: drv-net: Add test for devlink-rate traffic= class bandwidth distribution") Tested-by: Carolina Jubran Signed-off-by: Carolina Jubran Reviewed-by: Cosmin Ratiu Reviewed-by: Nimrod Oren Reviewed-by: Simon Horman --- .../drivers/net/hw/devlink_rate_tc_bw.py | 74 ++++++++----------- 1 file changed, 30 insertions(+), 44 deletions(-) diff --git a/tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py b= /tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py index 4da91e3292bf..abc20bc4a34a 100755 --- a/tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py +++ b/tools/testing/selftests/drivers/net/hw/devlink_rate_tc_bw.py @@ -68,39 +68,35 @@ from lib.py import cmd, defer, ethtool, ip =20 class BandwidthValidator: """ - Validates bandwidth totals and per-TC shares against expected values - with a tolerance. + Validates total bandwidth and individual shares with tolerance + relative to the overall total. """ =20 - def __init__(self): + def __init__(self, shares): self.tolerance_percent =3D 12 - self.expected_total_gbps =3D 1.0 - self.total_min_expected =3D self.min_expected(self.expected_total_= gbps) - self.total_max_expected =3D self.max_expected(self.expected_total_= gbps) - self.tc_expected_percent =3D { - 3: 20.0, - 4: 80.0, - } + self.expected_total =3D sum(shares.values()) + self.bounds =3D {} + + for name, exp in shares.items(): + self.bounds[name] =3D (self.min_expected(exp), self.max_expect= ed(exp)) =20 def min_expected(self, value): """Calculates the minimum acceptable value based on tolerance.""" - return value - (value * self.tolerance_percent / 100) + return value - (self.expected_total * self.tolerance_percent / 100) =20 def max_expected(self, value): """Calculates the maximum acceptable value based on tolerance.""" - return value + (value * self.tolerance_percent / 100) - - def bound(self, expected, value): - """Returns True if value is within expected tolerance.""" - return self.min_expected(expected) <=3D value <=3D self.max_expect= ed(expected) + return value + (self.expected_total * self.tolerance_percent / 100) =20 - def tc_bandwidth_bound(self, value, tc_ix): + def bound(self, values): """ - Returns True if the given bandwidth value is within tolerance - for the TC's expected bandwidth. + Return True if all given values fall within tolerance. """ - expected =3D self.tc_expected_percent[tc_ix] - return self.bound(expected, value) + for name, value in values.items(): + low, high =3D self.bounds[name] + if not low <=3D value <=3D high: + return False + return True =20 =20 def setup_vf(cfg, set_tc_mapping=3DTrue): @@ -364,38 +360,26 @@ def verify_total_bandwidth(bw_data, validator): """ total =3D bw_data['total_bw'] =20 - if validator.bound(validator.expected_total_gbps, total): + if validator.bound({"total": total}): return =20 - if total < validator.total_min_expected: + low, high =3D validator.bounds["total"] + + if total < low: raise KsftSkipEx( f"Total bandwidth {total:.2f} Gbps < minimum " - f"{validator.total_min_expected:.2f} Gbps; " - f"parent tx_max ({validator.expected_total_gbps:.1f} G) " + f"{low:.2f} Gbps; " + f"parent tx_max ({validator.expected_total:.1f} G) " f"not reached, cannot validate share" ) =20 raise KsftFailEx( f"Total bandwidth {total:.2f} Gbps exceeds allowed ceiling " - f"{validator.total_max_expected:.2f} Gbps " - f"(VF tx_max set to {validator.expected_total_gbps:.1f} G)" + f"{high:.2f} Gbps " + f"(VF tx_max set to {validator.expected_total:.1f} G)" ) =20 =20 -def check_bandwidth_distribution(bw_data, validator): - """ - Checks whether the measured TC3 and TC4 bandwidth percentages - fall within their expected tolerance ranges. - - Returns: - bool: True if both TC3 and TC4 percentages are within bounds. - """ - tc3_valid =3D validator.tc_bandwidth_bound(bw_data['tc3_percentage'], = 3) - tc4_valid =3D validator.tc_bandwidth_bound(bw_data['tc4_percentage'], = 4) - - return tc3_valid and tc4_valid - - def run_bandwidth_distribution_test(cfg, set_tc_mapping): """ Runs parallel iperf3 tests for both TCs and collects results. @@ -406,9 +390,10 @@ def run_bandwidth_distribution_test(cfg, set_tc_mappin= g): test_name =3D "with TC mapping" if set_tc_mapping else "without TC map= ping" print_bandwidth_results(bw_data, test_name) =20 - verify_total_bandwidth(bw_data, cfg.bw_validator) + verify_total_bandwidth(bw_data, cfg.traffic_bw_validator) =20 - return check_bandwidth_distribution(bw_data, cfg.bw_validator) + return cfg.tc_bw_validator.bound({"tc3": bw_data['tc3_percentage'], + "tc4": bw_data['tc4_percentage']}) =20 =20 def test_no_tc_mapping_bandwidth(cfg): @@ -453,7 +438,8 @@ def main() -> None: raise KsftSkipEx("Could not get PCI address of the interface") cfg.require_cmd("iperf3", local=3DTrue, remote=3DTrue) =20 - cfg.bw_validator =3D BandwidthValidator() + cfg.traffic_bw_validator =3D BandwidthValidator({"total": 1}) + cfg.tc_bw_validator =3D BandwidthValidator({"tc3": 20, "tc4": 80}) =20 cases =3D [test_no_tc_mapping_bandwidth, test_tc_mapping_bandwidth] =20 --=20 2.38.1