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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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Aleksandr Loktionov --- 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/Document= ation/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 assi= gned to a Virtual Function (VF). + * - ``max_sfs`` + - u32 + - The maximum number of subfunctions which can be created on the devi= ce. + 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, =20 /* 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 =20 +#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 =3D 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_generi= c[] =3D { .name =3D DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_NAME, .type =3D DEVLINK_PARAM_GENERIC_MAX_MAC_PER_VF_TYPE, }, + { + .id =3D DEVLINK_PARAM_GENERIC_ID_MAX_SFS, + .name =3D DEVLINK_PARAM_GENERIC_MAX_SFS_NAME, + .type =3D DEVLINK_PARAM_GENERIC_MAX_SFS_TYPE, + }, }; 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Sun, 17 May 2026 04:27:18 -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 2/2] net/mlx5: implement max_sfs parameter Date: Sun, 17 May 2026 14:27:00 +0300 Message-ID: <20260517112700.343575-3-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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0002256F:EE_|DM4PR12MB6568:EE_ X-MS-Office365-Filtering-Correlation-Id: 710f8d87-4afc-410c-5a61-08deb407488b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|82310400026|376014|1800799024|7416014|11063799003|22082099003|56012099003|18002099003|3023799003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700016)(82310400026)(376014)(1800799024)(7416014)(11063799003)(22082099003)(56012099003)(18002099003)(3023799003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: DlEHwpOVvkuKq2xOSTBGmqTbJM4oFvTznZZlq3aKmUPuTtj4HNwVvY9jUue7RtNEMCscYOzSQ7eUoDxeQaQwnihWObrZyj6JLBXmGZsFKR8aKiSK+HSd4K1XOHSqo8J89GsuR9p2J1yz8CQhsPi4lp/h332s7XODumIvcwST6bViWPS5Jd52jbsFODj+un9c180t7ZHb5Mt6sXn8nvYH3knWC8+QoCpoVwrUPvgemgn9pQE3Shui7QHMfnvHz5WMkocrLO7JxFs5GqdhgCshsqV589s1OrKkVYnnwWa4v9h2iwRVRZ1pZyJVbCU/YlXZj/CdBuMKeJxT3ZYUrfyQYoQjEkYaQdiPRPEYwlY3xmj3quHzimhyxneoOF5hQB4nsxOJyRNa504e36jhi+p0qcI3WGmxWX0rZRcMwPhhlMUTUlHFLlmjd6PKPcAFUdzI X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 May 2026 11:27:30.6139 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 710f8d87-4afc-410c-5a61-08deb407488b X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0002256F.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6568 Content-Type: text/plain; charset="utf-8" From: Nikolay Aleksandrov Implement max_sfs generic parameter to allow users to control the total light-weight NIC subfunctions that can be created using devlink instead of external vendor tools. A value of 0 will effectively disable creation of new subfunction devices. A warning is sent to user-space via extack (returning extack without error code is interpreted as a warning by user-space tools). Signed-off-by: Nikolay Aleksandrov Reviewed-by: David Ahern Signed-off-by: Tariq Toukan --- Documentation/networking/devlink/mlx5.rst | 7 +- .../mellanox/mlx5/core/lib/nv_param.c | 83 ++++++++++++++++++- 2 files changed, 86 insertions(+), 4 deletions(-) diff --git a/Documentation/networking/devlink/mlx5.rst b/Documentation/netw= orking/devlink/mlx5.rst index 4bba4d780a4a..283b93d16861 100644 --- a/Documentation/networking/devlink/mlx5.rst +++ b/Documentation/networking/devlink/mlx5.rst @@ -45,8 +45,13 @@ Parameters - The range is between 1 and a device-specific max. - Applies to each physical function (PF) independently, if the device supports it. Otherwise, it applies symmetrically to all PFs. + * - ``max_sfs`` + - permanent + - The range is between 0 and a device-specific max. + - Applies to each physical function (PF) independently. =20 -Note: permanent parameters such as ``enable_sriov`` and ``total_vfs`` requ= ire FW reset to take effect +Note: permanent parameters such as ``enable_sriov``, ``total_vfs` and ``ma= x_sfs`` + require FW reset to take effect =20 .. code-block:: bash =20 diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c b/drive= rs/net/ethernet/mellanox/mlx5/core/lib/nv_param.c index 19bb620b7436..eff3a67e4ca0 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/nv_param.c @@ -68,7 +68,9 @@ struct mlx5_ifc_mnvda_reg_bits { =20 struct mlx5_ifc_nv_global_pci_conf_bits { u8 sriov_valid[0x1]; - u8 reserved_at_1[0x10]; + u8 reserved_at_1[0xa]; + u8 per_pf_num_sf[0x1]; + u8 reserved_at_c[0x5]; u8 per_pf_total_vf[0x1]; u8 reserved_at_12[0xe]; =20 @@ -93,9 +95,11 @@ struct mlx5_ifc_nv_global_pci_cap_bits { }; =20 struct mlx5_ifc_nv_pf_pci_conf_bits { - u8 reserved_at_0[0x9]; + u8 log_sf_bar_size[0x8]; + u8 pf_total_sf_en[0x1]; u8 pf_total_vf_en[0x1]; - u8 reserved_at_a[0x16]; + u8 reserved_at_a[0x6]; + u8 total_sf[0x10]; =20 u8 reserved_at_20[0x20]; =20 @@ -755,6 +759,76 @@ static int mlx5_devlink_total_vfs_validate(struct devl= ink *devlink, u32 id, return 0; } =20 +static int mlx5_devlink_max_sfs_get(struct devlink *devlink, u32 id, + struct devlink_param_gset_ctx *ctx, + struct netlink_ext_ack *extack) +{ + struct mlx5_core_dev *dev =3D devlink_priv(devlink); + u32 mnvda[MLX5_ST_SZ_DW(mnvda_reg)] =3D {}; + void *data; + int err; + + err =3D mlx5_nv_param_read_per_host_pf_conf(dev, mnvda, sizeof(mnvda)); + if (err) { + NL_SET_ERR_MSG_MOD(extack, "Failed to read PF configuration"); + return err; + } + + data =3D MLX5_ADDR_OF(mnvda_reg, mnvda, configuration_item_data); + ctx->val.vu32 =3D MLX5_GET(nv_pf_pci_conf, data, total_sf); + + return 0; +} + +static int mlx5_devlink_max_sfs_set(struct devlink *devlink, u32 id, + struct devlink_param_gset_ctx *ctx, + struct netlink_ext_ack *extack) +{ + struct mlx5_core_dev *dev =3D devlink_priv(devlink); + u32 mnvda[MLX5_ST_SZ_DW(mnvda_reg)] =3D {}; + void *data; + int err; + + err =3D mlx5_nv_param_read_global_pci_conf(dev, mnvda, sizeof(mnvda)); + if (err) { + NL_SET_ERR_MSG_MOD(extack, + "Failed to read global PCI configuration"); + return err; + } + + data =3D MLX5_ADDR_OF(mnvda_reg, mnvda, configuration_item_data); + MLX5_SET(nv_global_pci_conf, data, per_pf_num_sf, !!ctx->val.vu32); + + err =3D mlx5_nv_param_write(dev, mnvda, sizeof(mnvda)); + if (err) { + NL_SET_ERR_MSG_MOD(extack, + "Failed to change per_pf_num_sf global PCI configuration"); + return err; + } + + memset(mnvda, 0, sizeof(mnvda)); + err =3D mlx5_nv_param_read_per_host_pf_conf(dev, mnvda, sizeof(mnvda)); + if (err) { + NL_SET_ERR_MSG_MOD(extack, "Failed to read PF configuration"); + return err; + } + + data =3D MLX5_ADDR_OF(mnvda_reg, mnvda, configuration_item_data); + MLX5_SET(nv_pf_pci_conf, data, log_sf_bar_size, ctx->val.vu32 ? 12 : 0); + MLX5_SET(nv_pf_pci_conf, data, pf_total_sf_en, !!ctx->val.vu32); + MLX5_SET(nv_pf_pci_conf, data, total_sf, ctx->val.vu32); + + err =3D mlx5_nv_param_write(dev, mnvda, sizeof(mnvda)); + if (err) { + NL_SET_ERR_MSG_MOD(extack, + "Failed to change PF PCI configuration"); + return err; + } + NL_SET_ERR_MSG(extack, "Modifying max_sfs requires a reboot"); + + return 0; +} + static const struct devlink_param mlx5_nv_param_devlink_params[] =3D { DEVLINK_PARAM_GENERIC(ENABLE_SRIOV, BIT(DEVLINK_PARAM_CMODE_PERMANENT), mlx5_devlink_enable_sriov_get, @@ -763,6 +837,9 @@ static const struct devlink_param mlx5_nv_param_devlink= _params[] =3D { mlx5_devlink_total_vfs_get, mlx5_devlink_total_vfs_set, mlx5_devlink_total_vfs_validate), + DEVLINK_PARAM_GENERIC(MAX_SFS, BIT(DEVLINK_PARAM_CMODE_PERMANENT), + mlx5_devlink_max_sfs_get, + mlx5_devlink_max_sfs_set, NULL), DEVLINK_PARAM_DRIVER(MLX5_DEVLINK_PARAM_ID_CQE_COMPRESSION_TYPE, "cqe_compress_type", DEVLINK_PARAM_TYPE_STRING, BIT(DEVLINK_PARAM_CMODE_PERMANENT), --=20 2.44.0