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Thu, 6 Aug 2026 00:31:06 -0700 From: Tariq Toukan To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , , Paolo Abeni CC: Aleksandr Loktionov , Alexander Lobakin , Arthur Kiyanovski , Daniel Zahka , David Ahern , "Gal Pressman" , Jiri Pirko , Jiri Pirko , Jonathan Corbet , Leon Romanovsky , , , , Mark Bloch , Nikolay Aleksandrov , "Nikolay Aleksandrov" , Petr Machata , "Przemek Kitszel" , Ratheesh Kannoth , Saeed Mahameed , Shuah Khan , Simon Horman , Tariq Toukan , Vlad Dumitrescu Subject: [PATCH net-next V5 1/2] devlink: add generic device max_sfs parameter Date: Thu, 6 Aug 2026 10:30:36 +0300 Message-ID: <20260806073037.3001886-2-tariqt@nvidia.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20260806073037.3001886-1-tariqt@nvidia.com> References: <20260806073037.3001886-1-tariqt@nvidia.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003F67:EE_|DM4PR12MB5771:EE_ X-MS-Office365-Filtering-Correlation-Id: 4a002d63-8c24-480e-0ae9-08def38cbd7e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|82310400026|1800799024|36860700016|376014|7416014|18002099003|22082099003|11063799006|6133799003|10067099003|56012099006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(23010399003)(82310400026)(1800799024)(36860700016)(376014)(7416014)(18002099003)(22082099003)(11063799006)(6133799003)(10067099003)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: vItmtIluCpyk55KXo+kBbedz2N3By4LUVM59jmEwuSm2wmkT+zzDLlgnDqKlqNgWol6SMAMdtPaE5YxREHuqqmOG6HDCkLE5n/DJpIZeGp19thy6o3085ehgPR3zUnstJqEXS0cU351hT/aWuYXHJqK42Dn9H7oOdB7/KgIFyvCv/6p5hz7x2ccWP9fYAOQ1qdkKOIBomqFMKK6la9/zpHoh45I6NZ7Pe/LaoT4cQGefPWNRcyv28NKLCvQbyLZNmR879rG1XG6i9UQFr1z/0EenukxHXoUbbXar12Mav5zGt/hGNMEwPlycHFQn/WIPb7+P0BSA9qB1kE8VSiyvlxyLWIcwtvoY323zUlFmmB9LSnV1gG20VHF7jhsV7+SxeE4yeYGJ5rl6694Y3wcpBwhFqZwymXN+HriTQGKonSgR3PK9KAK9tKjL3lRV6C5Z X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2026 07:31:33.2499 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4a002d63-8c24-480e-0ae9-08def38cbd7e X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003F67.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5771 From: Nikolay Aleksandrov Add a new generic devlink device parameter (max_sfs) to control if and how many light-weight NIC subfunctions can be created. Subfunctions are a light-weight network functions backed by an underlying PCI function. Their lifecycle can already be managed by devlink, but currently users cannot enable them in the device. They can be enabled/disabled only via external vendor tools. This parameter allows subfunctions to be enabled (>0) or disabled (0) via devlink. A subsequent patch will add support for max_sfs to the mlx5 driver. Signed-off-by: Nikolay Aleksandrov Reviewed-by: David Ahern Reviewed-by: Jiri Pirko Reviewed-by: Aleksandr Loktionov Reviewed-by: Alexander Lobakin Signed-off-by: Tariq Toukan --- Documentation/networking/devlink/devlink-params.rst | 6 ++++++ include/net/devlink.h | 4 ++++ net/devlink/param.c | 5 +++++ 3 files changed, 15 insertions(+) diff --git a/Documentation/networking/devlink/devlink-params.rst b/Documentation/networking/devlink/devlink-params.rst index ca19ee3e63c8..13eb8aa84c38 100644 --- a/Documentation/networking/devlink/devlink-params.rst +++ b/Documentation/networking/devlink/devlink-params.rst @@ -165,3 +165,9 @@ own name. - u32 - Controls the maximum number of MAC address filters that can be assigned to a Virtual Function (VF). + * - ``max_sfs`` + - u32 + - The maximum number of subfunctions which can be created on the device. + Modifying this parameter may require a device restart and PCI bus + rescanning because the BAR layout may change. A value of 0 disables + subfunction creation. diff --git a/include/net/devlink.h b/include/net/devlink.h index 4830aba4087a..7abd23376319 100644 --- a/include/net/devlink.h +++ b/include/net/devlink.h @@ -554,6 +554,7 @@ enum devlink_param_generic_id { DEVLINK_PARAM_GENERIC_ID_TOTAL_VFS, DEVLINK_PARAM_GENERIC_ID_NUM_DOORBELLS, DEVLINK_PARAM_GENERIC_ID_MAX_MAC_PER_VF, + DEVLINK_PARAM_GENERIC_ID_MAX_SFS, /* add new param generic ids above here*/ __DEVLINK_PARAM_GENERIC_ID_MAX, @@ -627,6 +628,9 @@ enum devlink_param_generic_id { #define DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_NAME "max_mac_per_vf" #define DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_TYPE DEVLINK_PARAM_TYPE_U32 +#define DEVLINK_PARAM_GENERIC_MAX_SFS_NAME "max_sfs" +#define DEVLINK_PARAM_GENERIC_MAX_SFS_TYPE DEVLINK_PARAM_TYPE_U32 + #define DEVLINK_PARAM_GENERIC(_id, _cmodes, _get, _set, _validate) \ { \ .id = DEVLINK_PARAM_GENERIC_ID_##_id, \ diff --git a/net/devlink/param.c b/net/devlink/param.c index 1cc562a6ebfd..8ca0f3ed646c 100644 --- a/net/devlink/param.c +++ b/net/devlink/param.c @@ -117,6 +117,11 @@ static const struct devlink_param devlink_param_generic[] = { .name = DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_NAME, .type = DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_TYPE, }, + { + .id = DEVLINK_PARAM_GENERIC_ID_MAX_SFS, + .name = DEVLINK_PARAM_GENERIC_MAX_SFS_NAME, + .type = DEVLINK_PARAM_GENERIC_MAX_SFS_TYPE, + }, }; static int devlink_param_generic_verify(const struct devlink_param *param) -- 2.44.0