From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from SN4PR2101CU001.outbound.protection.outlook.com (mail-southcentralusazon11012025.outbound.protection.outlook.com [40.93.195.25]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6DDA13816E0 for ; Mon, 2 Feb 2026 17:06:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.195.25 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770051962; cv=fail; b=XnIpGxdjRCXGJZI8y9eY5pOxpOEDxg9pWPF4Ej3hwpmZAH1Wsq72DNcI9m4U4M82nloAcppiAsoIZe9OxoLXDoGXMToiCbotiH4Z6fMXoTlqZDkN8YoYP5m3Lf/HN3A+uq52eCfaTtXzRBWBFSa/yzbmJ5u78+CpeRBggsNiTkY= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770051962; c=relaxed/simple; bh=t2FrcKiaN++GEbf6PPdtMeEU3iJH+lARm9vGC8IeWSQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KmuCV2iZ7BlK7+0EVfmqhuD5raeE/U7zHVlcEpJUvVrDSbsxdMkldbCik8v2lkkla9hc1c0iGSVvDsDi5ONuf3eHeV5I0L7zvWR4IHlv6WxPeo6D/aDxJ/wk7EikijWDSvi8X8F22Mv2n+7sWmQTnPr4FbK3MAoeIvLm5k4n/CY= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=YBwFFFNK; arc=fail smtp.client-ip=40.93.195.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="YBwFFFNK" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=K7L6kqJHw6E/Z48ol+zMDgfqKKF+Zcil1ZZGBihtz1v4GsuZuSoixD+sqUMkqcHcii+nvPIH80v4el198LYAAoN6CU2jzRVCMxJXL5UNlKYJz1Ssam745eSDMYIUOU4Nxt/8P5/pG/C61EHra7/lfY72RWcvCnGM1GKRo0nH8ZqGnDuWs1jyT5PlXOJBZnLW3VwOrAijS6HBhUBhQrJbeBn5VqSBaXPINhLgaIkGihy1STu+2AIZWQF5LZznRGiYrB7LB8TiWDkUk0ND1l4mgXpEV4XFCDeWxqvFZlXdQCe8vmUnZB35MG7uhJRHCl3qws6Vi3eya3vYNMhTRxXr8w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=oZ6edECz8/dpTF0Eojo0yum0MLTBqqVtUjhW1lhrxUA=; b=q/lpAUPRsoPB9pSsKTjrckdm07DepHv+ENr8mXfyGcYB77XKqqQBaWObDmZgnWaCTbGLsDsDEPCdWSViJZLwC9/qoG8mHVJkRAtHTQkXiJuhtXfi8OzQR4f6PmiWk8AISTVDD/m5G515juLZQQyXNIgNIfY3zpRhBKmmsg51g8tkR/+Josg+alTWNBavXQ0c0rMcitIjrcLNT+rDXGZ2S74poXs21bi1Bix+s1e059I0ON+nUUe91eZWbTQWHmEzRhUkWRXAraE+ceQ7jw1l3XfQhlC0spMVIkhJ6bUrmBy7IV8n12XX+XfUKSlMJcDIC2pW9eigRSjeFAvA9OZbFA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.118.233) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=oZ6edECz8/dpTF0Eojo0yum0MLTBqqVtUjhW1lhrxUA=; b=YBwFFFNKoG0MolJDi5j9+qbu7EvBNXepdnJABjbjb5d8Lp5wUMIuHDIMytkM/X5Iw6kAv3d+ZEilc0K859ZWmBFc8PFcQCdLpf9yW2Hfl8sXOdecL9nxhEw2wEi9/B//JzQmakH+5mynFZzR+/Viv1jadd/DCpUckMC3AxvBff2a6nGIyLwbV7jM2M50N21ltsoiHXlCBnacRfGXSeQ4SZqMjsbu6U7q1jShXpRO++cQ874osrhLCWd75+esY26dZVQVs49wwauhv0cOm3ox5o5UusZjGwDmPgGa704uEKfUZ9Gg8WOMZ8bnTJktJICWE8OkHqfyPoMt8eG2fmfOfQ== Received: from SJ0PR05CA0010.namprd05.prod.outlook.com (2603:10b6:a03:33b::15) by PH7PR12MB7377.namprd12.prod.outlook.com (2603:10b6:510:20c::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9564.16; Mon, 2 Feb 2026 17:05:53 +0000 Received: from SJ1PEPF00002319.namprd03.prod.outlook.com (2603:10b6:a03:33b:cafe::81) by SJ0PR05CA0010.outlook.office365.com (2603:10b6:a03:33b::15) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9587.12 via Frontend Transport; Mon, 2 Feb 2026 17:05:30 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.118.233) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.118.233 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.118.233; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.118.233) by SJ1PEPF00002319.mail.protection.outlook.com (10.167.242.229) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.10 via Frontend Transport; Mon, 2 Feb 2026 17:05:53 +0000 Received: from drhqmail202.nvidia.com (10.126.190.181) by mail.nvidia.com (10.127.129.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 2 Feb 2026 09:05:31 -0800 Received: from drhqmail201.nvidia.com (10.126.190.180) by drhqmail202.nvidia.com (10.126.190.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 2 Feb 2026 09:05:30 -0800 Received: from vdi.nvidia.com (10.127.8.14) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.2562.20 via Frontend Transport; Mon, 2 Feb 2026 09:05:29 -0800 From: Daniel Jurgens To: , , , CC: , , , , , , , , , , , "Daniel Jurgens" Subject: [PATCH net-next v17 03/12] virtio: Expose generic device capability operations Date: Mon, 2 Feb 2026 11:05:09 -0600 Message-ID: <20260202170518.9076-4-danielj@nvidia.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260202170518.9076-1-danielj@nvidia.com> References: <20260202170518.9076-1-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: SJ1PEPF00002319:EE_|PH7PR12MB7377:EE_ X-MS-Office365-Filtering-Correlation-Id: ec74bc45-504d-484c-0749-08de627d52b0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|7416014|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?JGhW879BzrK0gFwmfejYKaR04f2xjxbMGjMsiIEz18EoOBf7T7GrZgXwA/7R?= =?us-ascii?Q?zEPdJtgLbQpjaMwXe04RAlgbz7pd9Z4spEpbF7uAW/wKAm8deOBiZPkPfwRW?= =?us-ascii?Q?w1DOILMs1fbV9TH+EhDq7lwiwNCoFP5wNQR8quK8oAJf4geaGt2gjnAUV5bm?= =?us-ascii?Q?tx1cJxv7X4h8VM/QdgSM/HHgWF7A3OuR8ftcHR9QqjtJVu5ZurUFUUOIUqWv?= =?us-ascii?Q?BwbO5hWLNBs1SYrtaMcexsy7E797F1O5mjeMxasjbqJOsr2neLmtpuEmaVM3?= =?us-ascii?Q?se3ETeXQBoVsoI8Ah3qbjkVXYtEt8d9N+7iAfQP3KilFmXDRvcwvwHOgOI7Z?= =?us-ascii?Q?PEakXxMdOsUcAzjZQvqzyzQ9PBT+cA2ODwbywO94FhC6iEpjHkakgeCMnbvv?= =?us-ascii?Q?2DwEgm0k5hIN5WONj3s0n/GI5gAvtZH8xv5Na5HumWX+1QkhNdsj+IBPUpcd?= =?us-ascii?Q?P9++S1Gr/p5XfuhgqjGAAoeUX+v3Nmpwe2/n2piPPTL+9S4XncP/NtORzAZy?= =?us-ascii?Q?RTR193U5CTSx/K+Fq7X2NJJnBrwMTlXqsj0VZQitX8HlrJ+tWZniCZySifXu?= =?us-ascii?Q?b00DosIjmXvKehub4N9BXrOHuzrUpbbfbpAabUghZxTueiIA44jb1tg9vILd?= =?us-ascii?Q?frF9fd2/O6xstnJAiKtJhZKYXmR9Qx0L0TgWFr2ZIxOOzJr4YOKeKkJdBQcL?= =?us-ascii?Q?XcZraMSyWS4+95R6f1LFX7h5M/EvtGv/E1AYQSvL7r45N0Gc+TYKv5fyp1+q?= =?us-ascii?Q?JCxBlftXtFQeVNv9cl967OxaYxhylyvdEdm0gaMtQq+GKNq2cwENE1xtKbr1?= =?us-ascii?Q?rHTtcM7CCskGv5I8I8VawVMcquBXGeU7GUchZMgQW0076bF8XoTMZ7m6XWfj?= =?us-ascii?Q?PN7hvPxXf/gh+DX+Juo4b5mda8QX2ztbkSxsFfsWZkpdXSJrQLGzAXkGl2xZ?= =?us-ascii?Q?Y08QrG34ahMYnTzXnE3tVVLsntEK9biW0/WOc/145dGqx0sfIhpIldZZKYua?= =?us-ascii?Q?FpZZTbZTI3CZaIl5s3R3JwAIDRlTvf9iOVaSrbfxq0yXi7ivDUPLK+ysMj5r?= =?us-ascii?Q?Dw90F6gNwgV6XR1sb5RvRigyzDv1No75VtXbxwyliR2mGzSgtYvRsNHykb9+?= =?us-ascii?Q?wWg1HxETc9VT5TE5iZKdoZDfik21iYkqy9fTaEFcgXrxnbBMoFXmDiqRpF0s?= =?us-ascii?Q?jkiRsem8it3htkPVZI+cm53Kn6ItbZYinbkJkAIucdfUozNvdx4lyKncfz8R?= =?us-ascii?Q?NV/VMm0U6HLwdNzLo1+Cnh4U8q6HIm5ryDKYfZ3JbCZPvxMIBCp7qNKvecUp?= =?us-ascii?Q?XnfyjnDo570OF+3AEFJ9NOiKTXwt1UasClzwmWKrytSYk0GBouhe+ZdHcZmA?= =?us-ascii?Q?5ss0+5tlcgXqifxpJiw0Zz4fIbAWu+uhKERxewnAdOIWPdsN1vrGGmaZ1+KU?= =?us-ascii?Q?57ebcyfSjEoEteZEpaQl4MMmqIf3lQueIAnuPtzUIYYCyPIQDtmSvyVdIoeh?= =?us-ascii?Q?RuM/QgDep9gQBE8PJ6C1A0lttMjkBqUohwoaBmKmgYO5EapcNimGA13qDi7z?= =?us-ascii?Q?wefh1T1p7J36561+dSpTB/mqfXS2FcB8URas+FWOLWFtSe+gpAIPvjC1nF2R?= =?us-ascii?Q?VV77ZZZ8Fw1nY1dD+LiJKOztzk2a+Gfb0o3RA3K8/OppzSUOms7e0dT5JLdU?= =?us-ascii?Q?rtwhYA=3D=3D?= 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)(1800799024)(82310400026)(7416014)(376014)(36860700013);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: P1PqvCYydgarc7OZ0y5c6Thv8Z9BQwYv5RP+DKZ775nf7oFHE0wtaIF/BtuPst/IFQQy/Iz5mevWqRYhxOa6Ow3w4WEG3N6N3twz7EauUTtNshSrcYUd01XB2ccc7PEUHBKacZmFFNTNGwzRBiQdjn0JOiQbZm5Sw6okCA5eh7ZqGV5eTwzgCGai/BGQQihGSg+AC53xHi7S7jUdyA0hXO7dLk8joWT7ynp1yvi/s902Lr7vqgMTM2DcUjxmY4YvnSIziKsmCrDjcCY7ZWlHnurt9aT+ZTnZJ9AnE2ekx2bMIegmi2LcAGNlYk+ZGLO/wtco8OA01SrEIzpq3+FJn8twWPvbWJz/9vdf+B/ou9E+Bx7+rzJOgEVPgfUXOmmaJzBO2ffTldi43rXtM+/JMou/hcpgOtY4CLg5JP8FPSul9vhtYuw0yiXODTufxiC8 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2026 17:05:53.0727 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ec74bc45-504d-484c-0749-08de627d52b0 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: SJ1PEPF00002319.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7377 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. This changes the size of virtio_admin_cmd_query_cap_id_result. It's safe to do because this data is written by DMA, so a newer controller can't overrun the size on an older kernel. Signed-off-by: Daniel Jurgens Reviewed-by: Parav Pandit Reviewed-by: Xuan Zhuo --- v4: Moved this logic from virtio_pci_modern to new file virtio_admin_commands. v12: - Removed uapi virtio_pci include in virtio_admin.h. MST - Added virtio_pci uapi include to virtio_admin_commands.c - Put () around cap in macro. MST - Removed nonsense comment above VIRTIO_ADMIN_MAX_CAP. MST - +1 VIRTIO_ADMIN_MAX_CAP when calculating array size. MST - Updated commit message v13: - Include linux/slab.h MST - Check for overflow when adding inputs. MST v17: - Added missing includes. MST --- drivers/virtio/Makefile | 2 +- drivers/virtio/virtio_admin_commands.c | 96 ++++++++++++++++++++++++++ include/linux/virtio_admin.h | 80 +++++++++++++++++++++ include/uapi/linux/virtio_pci.h | 6 +- 4 files changed, 181 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..be9144b25d84 --- /dev/null +++ b/drivers/virtio/virtio_admin_commands.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#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; + + if (check_add_overflow(sizeof(*data), cap_size, &data_size)) + return -EOVERFLOW; + + 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..4ab84d53c924 --- /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 + */ + +#ifndef _LINUX_VIRTIO_ADMIN_H +#define _LINUX_VIRTIO_ADMIN_H + +struct virtio_device; +struct virtio_admin_cmd_query_cap_id_result; + +/** + * 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 e732e3456e27..96d097d3757e 100644 --- a/include/uapi/linux/virtio_pci.h +++ b/include/uapi/linux/virtio_pci.h @@ -315,15 +315,17 @@ struct virtio_admin_cmd_notify_info_result { #define VIRTIO_DEV_PARTS_CAP 0x0000 +#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 + 1, 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