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Tue, 19 May 2026 13:05:03 -0700 From: Tariq Toukan To: Eric Dumazet , Jakub Kicinski , Paolo Abeni , Andrew Lunn , "David S. Miller" CC: Jiri Pirko , Simon Horman , "Jonathan Corbet" , Shuah Khan , "Saeed Mahameed" , Leon Romanovsky , Tariq Toukan , Mark Bloch , Vlad Dumitrescu , Aleksandr Loktionov , Daniel Zahka , "David Ahern" , Nikolay Aleksandrov , , , , , Gal Pressman , Dragos Tatulea , Jiri Pirko , Nikolay Aleksandrov Subject: [PATCH net-next V2 1/2] devlink: add generic device max_sfs parameter Date: Tue, 19 May 2026 23:04:35 +0300 Message-ID: <20260519200436.353249-2-tariqt@nvidia.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20260519200436.353249-1-tariqt@nvidia.com> References: <20260519200436.353249-1-tariqt@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@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: MWH0EPF000C6184:EE_|CH3PR12MB9316:EE_ X-MS-Office365-Filtering-Correlation-Id: 1ab3dcb4-f61e-49be-6c0c-08deb5e1fe8e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|11063799006|22082099003|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 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)(82310400026)(36860700016)(376014)(7416014)(11063799006)(22082099003)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: voDigP675mUaSAs+pEe7jWihc42ut43R5dz+I9N/oeU5PNzATbExmZf9nidnvFYDMPEdqQYre8WwoTXUguRBIR76LsojXyOzq9e98MNrl20BFEXFyC1nPPb63y/a7YH4Gjr4Xpqves7jdR77SrLYTdCDymsZBAN67ocFxggNpJ+ZlC/cr62Wm1qX1uVDdPFwElgCw6qRE6PpXXSy8+W4/wAGln4yNx4sYwSPVKqF0QMThvLxJpHp6THu+6nxeoOxed3a5Ral/AJf1Truq4j2iOdEOYl/KYpSNs+nVWQWU+6BJURY0VwugbPE5dUizg6e9HBmcrBxVLl1rBKK9ODthSdrpaZSzkGayAW3/sU6xGzj279ITbN5mJKdWnoP8epOV8xQjlCPYIhLrMmFDiPa5YDmsDf9fsKKZTudFxxYdQWPRObc7tdzhigoaUse8bmV X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 May 2026 20:05:37.5227 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1ab3dcb4-f61e-49be-6c0c-08deb5e1fe8e 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: MWH0EPF000C6184.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9316 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 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 ea17756dcda6..29b8a9246fb6 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 bcd31de1f890..4ec455cfe7a4 100644 --- a/include/net/devlink.h +++ b/include/net/devlink.h @@ -546,6 +546,7 @@ 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, @@ -619,6 +620,9 @@ 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 cf95268da5b0..523243e49d88 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