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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan CC: "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , Ido Schimmel Subject: [PATCH net-next v2 0/4] nexthop: Refactor and fix nexthop selection for multipath routes Thread-Topic: [PATCH net-next v2 0/4] nexthop: Refactor and fix nexthop selection for multipath routes Thread-Index: Adm6SOcQ1ibIthrqHEOswUMI1khpHA== Date: Wed, 19 Jul 2023 13:57:06 +0000 Message-ID: <20230719-nh_select-v2-0-04383e89f868@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: YQBPR01CA0115.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:1::15) To MN2PR12MB4373.namprd12.prod.outlook.com (2603:10b6:208:261::8) x-mailer: b4 0.12.2 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; x-ms-publictraffictype: Email x-ms-traffictypediagnostic: MN2PR12MB4373:EE_|SA1PR12MB6994:EE_ x-ms-office365-filtering-correlation-id: 1fea5227-692a-40d9-0004-08db88600989 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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DIR:OUT; SFP:1101; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?utf-8?q?NWOIMxk76PX65VF40rlfDtScbItL?= =?utf-8?q?92JZ+H/8Ph1dA4A0rXuyA9b8Lpl/DDyPtXpEG8dHlasKN7EB400SxXOtgJ0zw6vh/?= =?utf-8?q?FZg3sS6R3nvTNf4uG7jFHzNECYLln4TNT356N1WbpP7bdKXOrt2cgvue0TAwAaySL?= =?utf-8?q?ZkQfe7HaKjlLETxTko6wnnXHn4vz8cepH9VRhbaCFV7ZljAOg0N/F/hHpHqXDVHbv?= =?utf-8?q?4kFeXnYt++SdxfIIQ/BFqYirgMB7IGvsg1XJuofLvRT86yVxglFscBlJZBedzOiq6?= =?utf-8?q?p6515wZIFOOvSMpeMm107ljRZK3sglFu+bfKHrZAaKmoQ0guP3/TkKRoSX9FlluBo?= =?utf-8?q?qp8e1wFcOvl5NRW4keRBxtAxq+vG5LwttwhulAmZxQ0ODEswHAicJjT5eYDyCuqES?= =?utf-8?q?PgBn7QqWgrIl7kSpNga+vZWEgpicPQ7nppwscUT8Nbh9GX2FAGH3Ahk17Y5L/eDfe?= =?utf-8?q?Sibm/YWWuyVlROK0GU8Yp/cGbS+yHkTmZ8hWK51WiumJY/duQ9kW/CMPotGnPNe9f?= =?utf-8?q?IB3VJXsM7CIf4LRpH0Cnrre4IwcbG1dfzIoeRWFCcAydrq5ZHfpg6pAARfIkk33/6?= =?utf-8?q?Iy/LcAP2wn4EEvwjlCrbGHvWxyYVTuxSSGxoEJawx/oYi858XxUs5+U7S7uBoDfrU?= =?utf-8?q?S/fW0Gtauxn5qRQf97XHe03Srfuc96cC0wqPcqz+y6EL1coTgt2twdpLA8CSordc9?= =?utf-8?q?RGQp6SqknzJL+wvHR9VxsaefXk3+K3UH45ZtKRMmIQNSUyxnUTrQPCqHU3lTFGQ8x?= =?utf-8?q?jA9NjLxn3qNzQZrDLuNPGD6kXykbwr4fdEXZhnNQHH7jk2jJD3E40QGyUN957fd+r?= =?utf-8?q?qKtzXoJH0GKgol/RJQzO2gUo2tQbr94JWBW/orq58k9+XztXYsug7GaXBFVa1Gn4a?= =?utf-8?q?y3zP2gNuLvpZa+yRIGLcweUzypCTXRaMbZTj4u640ElcEIVBKtgBsJU5Vw5ZxNZwL?= =?utf-8?q?3Gfu9ZXKSRpWJDtpHYhrcyv9OFqBUuylbXG8OgkuP0UnAmdDX4Pr6fjwyJjh6RbI+?= =?utf-8?q?a15yRN7jVNG6wPpFMqNnnDL2riwwE81JE6Vkj2Ub7tzb5a4K7SMBi6sl83PHH2pVB?= =?utf-8?q?yxRMkRhzjoSsCFrBvgICFZRAOk5zOdywCp4LHXtmmteQXsu0V2d9aGOytK87yAHIh?= =?utf-8?q?SzX/IVX59caYQB4V/XDX6XfPqnclnLOFxlkzAdnRgFQcEqI99eS0bjxDCGWrdc3BB?= =?utf-8?q?pA0v/SHJV/ixG/awIXM7y0+1X5jLj+Ux7dOK6bU/smNwIY0SUnUPfbO7LbRbUmZUy?= =?utf-8?q?gcUo45We5a6KyK7UOm/QFsoJyIbuZmVKngR9IKyyL9/EpUbD5cZkzfAUtv5Rzo2D5?= =?utf-8?q?q1V3c3IsbmgcAq9+mw7jEsN4N5nH82GychaMvAgaBnwRWYj/u+JvCk6Jg4Rrucrc9?= =?utf-8?q?DnLAWqGMc/a/How7KAOyk8IMQyux6rcAC50MEQz7LvLjcJ8kPniZvcSfmt3oCUhtA?= =?utf-8?q?3vvuYrn+OBbVjSCzH9OPgigeTML8t4ohUcYC+o2o29PnjwSG4wSkNrZ/ZhLCEKHZ/?= =?utf-8?q?AfQccR/4bv6a?= Content-ID: <8E9D4BB7EE706245B6BA73BAA5750378@namprd12.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4373.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1fea5227-692a-40d9-0004-08db88600989 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Jul 2023 13:57:06.1225 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 2fEl6yldKqbnGaKyqmAHdj+K3iDJ4gSGsfr7EdlhgaL1mF1dJro4S+qnmZ4FtScMND6DB8c7dxtND9dNGK6yLg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6994 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org In order to select a nexthop for multipath routes, fib_select_multipath() is used with legacy nexthops and nexthop_select_path_hthr() is used with nexthop objects. Those two functions perform a validity test on the neighbor related to each nexthop but their logic is structured differently. This causes a divergence in behavior and nexthop_select_path_hthr() may return a nexthop that failed the neighbor validity test even if there was one that passed. Refactor nexthop_select_path_hthr() to make it more similar to fib_select_multipath() and fix the problem mentioned above. v2: Removed unnecessary "first" variable in "nexthop: Do not return invalid nexthop object during multipath selection". v1: https://lore.kernel.org/netdev/20230529201914.69828-1-bpoirier@nvidia.com/ --- Benjamin Poirier (4): nexthop: Factor out hash threshold fdb nexthop selection nexthop: Factor out neighbor validity check nexthop: Do not return invalid nexthop object during multipath selection selftests: net: Add test cases for nexthop groups with invalid neighbors net/ipv4/nexthop.c | 61 +++++++++---- tools/testing/selftests/net/fib_nexthops.sh | 129 ++++++++++++++++++++++++++++ 2 files changed, 171 insertions(+), 19 deletions(-) --- base-commit: 36395b2efe905650cd179d67411ffee3b770268b change-id: 20230719-nh_select-0303d55a1fb0 Best regards,