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Wed, 15 Oct 2025 22:01:08 -0700 From: Daniel Jurgens To: , , , , CC: , , , , , , , , , , , , Daniel Jurgens Subject: [PATCH net-next v5 03/12] virtio: Expose generic device capability operations Date: Thu, 16 Oct 2025 00:00:46 -0500 Message-ID: <20251016050055.2301-4-danielj@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251016050055.2301-1-danielj@nvidia.com> References: <20251016050055.2301-1-danielj@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: BL6PEPF00020E65:EE_|SA0PR12MB4365:EE_ X-MS-Office365-Filtering-Correlation-Id: 7053bb62-c89a-4f1f-269e-08de0c710de6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?lYa2Fewx3X7FIY8/wb4ZKXJIh6GhlIMFOHm4hgi0Y74jts+IIunMaDN+KNKS?= =?us-ascii?Q?AUfEG5/ssYjEOll3fQRfPOj/Uj4j8fBDB281PbH9kwQHQjMBNwsRyQcnMvPx?= =?us-ascii?Q?TMzsb0yKRBj9X3vxh1k3JumwVDmYnWOf/XmwRBEvhPSuo9r331gvKmbbwAjy?= =?us-ascii?Q?SoH0oLdfQepfnjUzWoDTuNbNGSAkDxp/+9NnjqLbpxmp9crsw5fmvFRapzXt?= =?us-ascii?Q?jMt2N+7hJ3hAGWqxAVfP9AD+1Me5sRsMRhjH9x//GHUyd+Z0qXn1CH4q+4Db?= =?us-ascii?Q?wnge2aFdF09qxbn0NVL5ixakybk0YRe1uskgfGIo7+oJycTY9fww3X3S/KII?= =?us-ascii?Q?dhHTARrG7+1sdyMSQoKfg1g/cXdPVOck+ACRyJ4oGD1PhelgsM9ortDMDi+2?= =?us-ascii?Q?ltZvNL8b24V55qlFmRr6BSFx5jp3PkpDftLPy4RGW6qRM4/LQggfSHEOstIB?= =?us-ascii?Q?QTEQzZW38cIyxuzYrGAJtjuEVMBAF4+SZfHsWjQoFWkh4xceJpb9////FjJx?= =?us-ascii?Q?TQQc+LOsJTkPltCng2dbztJnrBadMsjaQhnfrgHX9PD17O1YOW8B152vnK0X?= =?us-ascii?Q?ChQSZNedU5CrxZWWZeCrlPxX63EuSvFblgU8bIWQCkdoa6A+xuU2iizPhUfe?= =?us-ascii?Q?4vzV9QovfdG8KBFgdnpmhePsSL875zz6/p9QDWf14NisQnNDxPTexpiWp7yU?= =?us-ascii?Q?RXG0UgC+RbdifER2NYjY2qOV/Obd2xR5OYBj/1ywgxE1GNDmMeleboe10h/8?= =?us-ascii?Q?u/YQ4uDL11r9+rIKB2DmznFYUSMp21jur6Q9s5iMOhDvEc0GCq5eQVWv3knk?= =?us-ascii?Q?jwS8grs7+1tvvj341p4g8DqklAWXUoLrf3H64/W0Bqs9/8LnXSUHo1BQp7g+?= =?us-ascii?Q?n7/H+6C9ScHx8eIXj5AgSSGq8f1wk+puC/zyA/NCO5+3Kd0YlTZiFo4b8qNS?= =?us-ascii?Q?3uVvAO/Ioaq9QQwKk/cyNXjGKufTm4uqm2ghPKVKg4nxl4cpxPyO2t7W+VHt?= =?us-ascii?Q?eXHf2JnkiMfR0zylnYp7Ax46WEpWToQA6BWY+PhNv00LiIhvWCJZ8tIt++EC?= =?us-ascii?Q?Z5ro4SE6SWZJr1ZV65E/ELK6Ig/6Xi2uDipvw64YeR3PNFUoipWvoNU1w5NM?= =?us-ascii?Q?zSqb0d6snPaR/5dA4TtD0cfPubsiqDvDJHRsXblGmjS9VRsCUNnk5orZidb8?= =?us-ascii?Q?NFDPcdiLSfENnsfynB1LwrduY7I7bWv7cZ3Q/a/TykwMyAvoGFUP6OOSaeNx?= =?us-ascii?Q?lwUAeqIQNASAFjVzmzfOfoqXJYdCYVwExQM8aGk2HG3spfhRpbmwIuKmosVw?= =?us-ascii?Q?8K5bs7JIw2VJ7nT0WxrTOSqQRj7HZsO4L106QZoDmncCG1lEPm1vxM3+BpY6?= =?us-ascii?Q?uDUsbP6xZe6hpXzOmsvntlxE6nzzuzruFZmLMtz8UI8sr0ad+5CW44UK79wj?= =?us-ascii?Q?VMftBZl/HhZTjBGi/ZDsIDWK0y/Xi8umWLkrKfumXyK33v44bfezwBVhIvGH?= =?us-ascii?Q?MALaBTkeyv5zTOJlsvDAbcjjUBgaO4w9c9e+ONKOK8snGhaYjuJ/q7KxLQyZ?= =?us-ascii?Q?MTu0jy4aODYDMbaVQVQ=3D?= 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)(36860700013)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2025 05:01:23.5437 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7053bb62-c89a-4f1f-269e-08de0c710de6 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: BL6PEPF00020E65.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4365 Currently querying and setting capabilities is restricted to a single capability and contained within the virtio PCI driver. However, each device type has generic and device specific capabilities, that may be queried and set. In subsequent patches virtio_net will query and set flow filter capabilities. Signed-off-by: Daniel Jurgens Reviewed-by: Parav Pandit --- v4: Moved this logic from virtio_pci_modern to new file virtio_admin_commands. --- drivers/virtio/Makefile | 2 +- drivers/virtio/virtio_admin_commands.c | 90 ++++++++++++++++++++++++++ include/linux/virtio_admin.h | 80 +++++++++++++++++++++++ include/uapi/linux/virtio_pci.h | 7 +- 4 files changed, 176 insertions(+), 3 deletions(-) create mode 100644 drivers/virtio/virtio_admin_commands.c create mode 100644 include/linux/virtio_admin.h diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile index eefcfe90d6b8..2b4a204dde33 100644 --- a/drivers/virtio/Makefile +++ b/drivers/virtio/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o +obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o virtio_admin_commands.o obj-$(CONFIG_VIRTIO_ANCHOR) += virtio_anchor.o obj-$(CONFIG_VIRTIO_PCI_LIB) += virtio_pci_modern_dev.o obj-$(CONFIG_VIRTIO_PCI_LIB_LEGACY) += virtio_pci_legacy_dev.o diff --git a/drivers/virtio/virtio_admin_commands.c b/drivers/virtio/virtio_admin_commands.c new file mode 100644 index 000000000000..94751d16b3c4 --- /dev/null +++ b/drivers/virtio/virtio_admin_commands.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include + +int virtio_admin_cap_id_list_query(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data) +{ + struct virtio_admin_cmd cmd = {}; + struct scatterlist result_sg; + + if (!vdev->config->admin_cmd_exec) + return -EOPNOTSUPP; + + sg_init_one(&result_sg, data, sizeof(*data)); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_CAP_ID_LIST_QUERY); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.result_sg = &result_sg; + + return vdev->config->admin_cmd_exec(vdev, &cmd); +} +EXPORT_SYMBOL_GPL(virtio_admin_cap_id_list_query); + +int virtio_admin_cap_get(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size) +{ + struct virtio_admin_cmd_cap_get_data *data; + struct virtio_admin_cmd cmd = {}; + struct scatterlist result_sg; + struct scatterlist data_sg; + int err; + + if (!vdev->config->admin_cmd_exec) + return -EOPNOTSUPP; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = cpu_to_le16(id); + sg_init_one(&data_sg, data, sizeof(*data)); + sg_init_one(&result_sg, caps, cap_size); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DEVICE_CAP_GET); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.data_sg = &data_sg; + cmd.result_sg = &result_sg; + + err = vdev->config->admin_cmd_exec(vdev, &cmd); + kfree(data); + + return err; +} +EXPORT_SYMBOL_GPL(virtio_admin_cap_get); + +int virtio_admin_cap_set(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size) +{ + struct virtio_admin_cmd_cap_set_data *data; + struct virtio_admin_cmd cmd = {}; + struct scatterlist data_sg; + size_t data_size; + int err; + + if (!vdev->config->admin_cmd_exec) + return -EOPNOTSUPP; + + data_size = sizeof(*data) + cap_size; + data = kzalloc(data_size, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = cpu_to_le16(id); + memcpy(data->cap_specific_data, caps, cap_size); + sg_init_one(&data_sg, data, data_size); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DRIVER_CAP_SET); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.data_sg = &data_sg; + cmd.result_sg = NULL; + + err = vdev->config->admin_cmd_exec(vdev, &cmd); + kfree(data); + + return err; +} +EXPORT_SYMBOL_GPL(virtio_admin_cap_set); diff --git a/include/linux/virtio_admin.h b/include/linux/virtio_admin.h new file mode 100644 index 000000000000..36df97b6487a --- /dev/null +++ b/include/linux/virtio_admin.h @@ -0,0 +1,80 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Header file for virtio admin operations + */ +#include + +#ifndef _LINUX_VIRTIO_ADMIN_H +#define _LINUX_VIRTIO_ADMIN_H + +struct virtio_device; + +/** + * VIRTIO_CAP_IN_LIST - Check if a capability is supported in the capability list + * @cap_list: Pointer to capability list structure containing supported_caps array + * @cap: Capability ID to check + * + * The cap_list contains a supported_caps array of little-endian 64-bit integers + * where each bit represents a capability. Bit 0 of the first element represents + * capability ID 0, bit 1 represents capability ID 1, and so on. + * + * Return: 1 if capability is supported, 0 otherwise + */ +#define VIRTIO_CAP_IN_LIST(cap_list, cap) \ + (!!(1 & (le64_to_cpu(cap_list->supported_caps[cap / 64]) >> cap % 64))) + +/** + * virtio_admin_cap_id_list_query - Query the list of available capability IDs + * @vdev: The virtio device to query + * @data: Pointer to result structure (must be heap allocated) + * + * This function queries the virtio device for the list of available capability + * IDs that can be used with virtio_admin_cap_get() and virtio_admin_cap_set(). + * The result is stored in the provided data structure. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability queries, or a negative error code on other failures. + */ +int virtio_admin_cap_id_list_query(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data); + +/** + * virtio_admin_cap_get - Get capability data for a specific capability ID + * @vdev: The virtio device + * @id: Capability ID to retrieve + * @caps: Pointer to capability data structure (must be heap allocated) + * @cap_size: Size of the capability data structure + * + * This function retrieves a specific capability from the virtio device. + * The capability data is stored in the provided buffer. The caller must + * ensure the buffer is large enough to hold the capability data. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability retrieval, or a negative error code on other failures. + */ +int virtio_admin_cap_get(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size); + +/** + * virtio_admin_cap_set - Set capability data for a specific capability ID + * @vdev: The virtio device + * @id: Capability ID to set + * @caps: Pointer to capability data structure (must be heap allocated) + * @cap_size: Size of the capability data structure + * + * This function sets a specific capability on the virtio device. + * The capability data is read from the provided buffer and applied + * to the device. The device may validate the capability data before + * applying it. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability setting, or a negative error code on other failures. + */ +int virtio_admin_cap_set(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size); + +#endif /* _LINUX_VIRTIO_ADMIN_H */ diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h index c691ac210ce2..0d5ca0cff629 100644 --- a/include/uapi/linux/virtio_pci.h +++ b/include/uapi/linux/virtio_pci.h @@ -315,15 +315,18 @@ struct virtio_admin_cmd_notify_info_result { #define VIRTIO_DEV_PARTS_CAP 0x0000 +/* Update this value to largest implemented cap number. */ +#define VIRTIO_ADMIN_MAX_CAP 0x0fff + struct virtio_dev_parts_cap { __u8 get_parts_resource_objects_limit; __u8 set_parts_resource_objects_limit; }; -#define MAX_CAP_ID __KERNEL_DIV_ROUND_UP(VIRTIO_DEV_PARTS_CAP + 1, 64) +#define VIRTIO_ADMIN_CAP_ID_ARRAY_SIZE __KERNEL_DIV_ROUND_UP(VIRTIO_ADMIN_MAX_CAP, 64) struct virtio_admin_cmd_query_cap_id_result { - __le64 supported_caps[MAX_CAP_ID]; + __le64 supported_caps[VIRTIO_ADMIN_CAP_ID_ARRAY_SIZE]; }; struct virtio_admin_cmd_cap_get_data { -- 2.50.1