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Wed, 3 Jun 2026 03:27:10 -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 , Daniel Zahka , "Aleksandr Loktionov" , Przemek Kitszel , Arthur Kiyanovski , "Petr Machata" , Ratheesh Kannoth , "Nikolay Aleksandrov" , David Ahern , , , , , Gal Pressman , Amery Hung , Nikolay Aleksandrov , Jiri Pirko Subject: [PATCH net-next V3 1/2] devlink: add generic device max_sfs parameter Date: Wed, 3 Jun 2026 13:26:45 +0300 Message-ID: <20260603102646.404797-2-tariqt@nvidia.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20260603102646.404797-1-tariqt@nvidia.com> References: <20260603102646.404797-1-tariqt@nvidia.com> Precedence: bulk X-Mailing-List: linux-rdma@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: MWH0EPF000A672E:EE_|EAYPR12MB999156:EE_ X-MS-Office365-Filtering-Correlation-Id: 718e156c-47a5-401a-9519-08dec15abb31 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|7416014|376014|82310400026|6133799003|11063799006|56012099006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(36860700016)(1800799024)(7416014)(376014)(82310400026)(6133799003)(11063799006)(56012099006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: PBU+lL1DdrNz7O+dveHKaw8KC9q9c5cIpBG7HGd5Ut5iyoVPJnkvthKv5eGO5Ml6epWaaLRm9D89fxQ9tcSokIc7MnzoL1RsSCVqyuDf9aG3OzmbC3d86ZNFvtpcsm/IVDo0VNPZxLyfOk4JDAfqfM6NpHBNb5SRdF7GAQBBAwyD8vucj/a8n5bdqvqCt9paCCRFuif62lyd47wm5AcrhY22LG9bzg78wc/BC7NHR+DJmWrfW7ipBBcx+gjZd2qYaHzOHZwQdPWtGeElONsn0+san8NLwbIFWVHOIu/mlsFKwXwOM6UcIkYD9z5qWdzpvsvQzr8NpaaNgVGEwi4oAhbJs/NgwMPO3ebRIPzgBJ9MIoKFLRXhtkYXtw9VlhT9MIxxhtuUUnIFtVsmrcmpV/FMXXjmPiNAQzFefq16i7sCso6DY6/qsbMocqFRQ2Sa X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jun 2026 10:27:36.3576 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 718e156c-47a5-401a-9519-08dec15abb31 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000A672E.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: EAYPR12MB999156 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 5f4083dc4345..ecdc7098a4d9 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 1a196d3a843d..1d5f5c205c32 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