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Thu, 23 Jul 2026 01:27:11 -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 V4 1/2] devlink: add generic device max_sfs parameter Date: Thu, 23 Jul 2026 11:26:42 +0300 Message-ID: <20260723082643.1870844-2-tariqt@nvidia.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20260723082643.1870844-1-tariqt@nvidia.com> References: <20260723082643.1870844-1-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: DS1PEPF0001708E:EE_|CY5PR12MB6384:EE_ X-MS-Office365-Filtering-Correlation-Id: 8b96deac-3e3c-4260-7469-08dee8943e52 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|82310400026|7416014|23010399003|376014|22082099003|18002099003|11063799006|10067099003|56012099006|6133799003; X-Microsoft-Antispam-Message-Info: wqjAd3raF/2I9Ib4giXlUSv94UMHp5GU9Wc32YR84z9DyHRk2GGb1lppLJl2TxIU8ZbxFoKBBCpwgjAyR+hmMbGeIXqLvOs5dMpXcaxypcIRNPOwChRGIpyI0Zxqvx4vjpRZhvGc6iD6m1bcEPvVGbSXvIm5FnFn+XQ+fWBum3HO9fKk6FTx7f4Pean0lB2BB9x8nvOqFVqOU1XvFJptuyRtlmyfAOAlNw6V0vcT7fYDxtmQFItDjUdwPUo7/AAT0384Ojg8jfpIAz5OS2mu9W4RxdxjOiccd12ab/9/fDsEGnHGqBlO+2RbqczZjQJbHJ+Cp9HKceE34qxTuw0GNT2AuJINlJxwnALeU0OOuofwpDefFwamsEAKxW88Gv9M5AbCYO2jnHEp7aEW3DOSqoh0z3+mXuuIK2Wbp7X30oP0Qs8CWlgYU7Jx9f18fq9kPl/OrfL57dybqg+R2ycGvE+yZcN366r/rRMelKNoootuZZlu47JVOvF/sN42waosBeMGGohOiz8+bOMYXzMmsYDc0kNzOhQQx8Cy984TCmz8u1KHTV8o1kcqiMY78U50gdaufS0WN5cPL+Ue2e8apUyrtQDPnB3Gal0jTldjo0cZe+DOoUiqc8cdFW+3jGkt5OfpNADQOLZQkvCG3zgi1dZUj2re5PUhpSH5tBi54rYw46bqrON3oDorL58YuDOyWXdc8LOLmPPeSYldQMEW2Q== 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)(1800799024)(36860700016)(82310400026)(7416014)(23010399003)(376014)(22082099003)(18002099003)(11063799006)(10067099003)(56012099006)(6133799003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: frz1MyO6q9IBEAc1gP0GLmfoERM4XpDUm/l9a2K/Q5ffiiG/K/++yFteudH2Kf7lka6RnMXvxfYVzdVCKX8FZJJaxF55ScX5JmgCyvzi4SpNAxxqnb3N075VauFIvPBA4DJAJ/6Fh0afKev3W9GzpAz3SG+TKJulYPhIr9xpcLG6EP+r9vJ6ghtOn+dvJFIkyCVO1gukKNrZyDVAqCqQ0eqYnBv8Y7HvM0iWWpGKb9wWr8TX+vdPCNQ/d07Mc9CD6WfQho4M79RB7/9l4JRQR42uBMBjSiOZXnhouZJscmoMWBIVIXbhJtl1ijQhM4ZRIqfhod+fQMtvm8RO0TjTjzKwiG8em7iVIAfKO49Bx94RPt03F74PHbH+IQZdkUZl2R4gWz16JT67jr19RhE4Lob7jLnwcRIJK90DqNlZBFJDQNVXs9DIvPdtTh0jEtK/ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2026 08:27:33.0128 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8b96deac-3e3c-4260-7469-08dee8943e52 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: DS1PEPF0001708E.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6384 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