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Sun, 17 May 2026 04:27:11 -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 1/2] devlink: add generic device max_sfs parameter Date: Sun, 17 May 2026 14:26:59 +0300 Message-ID: <20260517112700.343575-2-tariqt@nvidia.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20260517112700.343575-1-tariqt@nvidia.com> References: <20260517112700.343575-1-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: DS1PEPF00017097:EE_|SN7PR12MB7812:EE_ X-MS-Office365-Filtering-Correlation-Id: a0e9e4bf-611b-4433-015f-08deb407422b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|11063799003|22082099003|18002099003|56012099003; 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)(1800799024)(82310400026)(36860700016)(376014)(7416014)(11063799003)(22082099003)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: IUJbNXnNO4o/Y1ZHfCgsbts0zUewebXZHjTb0CLkldY77hbwjMfG/iug5T5T6VrJFGyWKLf/ZfAWO16zTKAEg9GdmBbbhyg/uDRMqU4ntJvceyxJ+uTNgT8DModPj80p7tkt3gzFiobT/d0qHZw6Y84b3VA6NqzsmEGjLFdnZekm+d1Mf/k8daittXUXMw4NdSmVVELQWF+iWy0qArWvLxc2PEPAk6IOv6KX4GfmxJUkkp0Gf+nMKsgUlfOGsRUGqNve23T8hhCioRNP5NHpWVdJTKGnMx9fo8ruwIxJrflL8ETwHPGUMu9XYcR9aFYpy4VAxt45qu+AqOedFueNpbNglqIWYqSx2aTVXDmFunEa/1z65ud78qrNMNFda6Si6S0PE7Mh/gSUTC6eBte1fEuAFbqRWuFI5EgSbJewz0mCTrBcQkWHMNN7pb37hMgJ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 May 2026 11:27:19.9614 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a0e9e4bf-611b-4433-015f-08deb407422b 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: DS1PEPF00017097.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7812 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 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