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Sat, 6 Dec 2025 04:42:11 -0800 From: Zhi Wang To: , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Zhi Wang Subject: [RFC 1/7] rust: pci: expose sriov_get_totalvfs() helper Date: Sat, 6 Dec 2025 12:42:02 +0000 Message-ID: <20251206124208.305963-2-zhiw@nvidia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251206124208.305963-1-zhiw@nvidia.com> References: <20251206124208.305963-1-zhiw@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: MWH0EPF000971E2:EE_|SA1PR12MB6918:EE_ X-MS-Office365-Filtering-Correlation-Id: a771fb6a-e11d-40fa-4959-08de34c4e589 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?f6rNC2Shn/yNrsJSHFfCogXlL+3WTbLpz+pQURKW0o834ueO752Ck2hYKPhK?= =?us-ascii?Q?eMKcK87s5sXWf3ba+wGOovQMxsoAVY3nVRR11QUK6JxnxArCuDUr7qVKdAX0?= =?us-ascii?Q?b32MTqbcNp67SsibBhuejpFOl8QcO3+0pJlu6umOA0mZQfm8ZLbH5Km0zA2O?= =?us-ascii?Q?WhBLR+iKLA0Eg84qgcFre09mzM9SW5/b0OycsP1EEwTK/qX+U8cjbzK1xv3D?= =?us-ascii?Q?ddasXMlXYwFW7LDc+WTKV7Ex/afl74mXH15gmPOX/X2KGlNVT78ochwGetFO?= =?us-ascii?Q?Jw8dfCI3ZjoxY3/FqQDobZt5xqhqtQCogpOpYUSmQ5euFt5IKcniWvFj6ZIT?= =?us-ascii?Q?SfrPHoQpb7+QmR0qKpdQoAHz1yyZUUnBkopfvaDc2j20utZeDf3XB5Y04/Io?= =?us-ascii?Q?iywtJubCgSZNiAk1nhKk/ymj/GOHQtJ7HdJqcyQVMdun7xKVHunn5hqGflM6?= =?us-ascii?Q?6unqGNTIEb20b6bh+UZZMiKnXrTwWOCzJpxpzMavQOXLie7VMgRmdcpxeL+l?= =?us-ascii?Q?akKUEc1EUZhhgphNZhrxU5sy9ZqGEGTdYvASXeNxg+6VjcdAXqvm9s/tRcdY?= =?us-ascii?Q?RstkbF75PkiZ6wYBUbtxr4o4IZK0Uydq/bf0caoqGuYNbChHvLNgIqxX135y?= =?us-ascii?Q?qhwjnumy+7nACm6Mp+2s+TSYYpApC9dP94/r8H/az2Y+xL41lBpd/4KNiDyD?= =?us-ascii?Q?ddrB/KTCP6nL6xXsMLEd1OLgCZn2Cs4ryKUXgqhB69cBOCojW0dLBeN30wqL?= =?us-ascii?Q?xShePoNXQxdeE2bW7vHKRuXWJ2livqBuIDAlP9GdmrhQjmvGMdacXe318iLI?= =?us-ascii?Q?zc6hTueeWgSdtRVAvOlBE17BsHD5XHb8rUfswi8gRAwL7i6kjtq9LfOwAzaB?= =?us-ascii?Q?/g2uyiBRhWN54cKPpuv2FUWdCQmI51uRpjFwI2+uUOJweoxm3wacv3SHYzhx?= =?us-ascii?Q?ag58GdVoroixouaXInF+WuscmcjIEBpsMbuoLCgCfpdHk3XtHWvitEBOLuIM?= =?us-ascii?Q?9FGGG5G+hYXDGLMA0xbD+75cR7XjaoG6Rh8ndpWRF+kz6UK8l3MALdzu6ydl?= =?us-ascii?Q?hIQdZz8eo00JYCJ/25y1CnmFEpheHx89tRqPw4yIRlfjDilFYNqZpPZrxT8H?= =?us-ascii?Q?6hPB2AGi75GkVwIQdTAPlechKeuxidtSjTzqaWVEqTftkN2H9XryZlOgtBL0?= =?us-ascii?Q?l7u9+I1yDtpbJP2K5PJT7NwLHrvLIsHwEpoUq7NacKNnevbyzVlQdV5ikRyj?= =?us-ascii?Q?3qzBvAV3D2Gj5SWjbNh1DKrLeM47PZ1idJO+z40mBIbg2qOG1wSOGA7P29u9?= =?us-ascii?Q?V3RTAoqGnfG6nYIZhQRSPM/roX5lXgqXTL0uupZHRPvsxrbEYvCDvT8GPp87?= =?us-ascii?Q?KYhiVhEUJ1VdOqLWrcb7IXdtxthHS3Ti0kcMmqWcBYystAi5aiisBPDjw9gq?= =?us-ascii?Q?X2/NCXRUnVHPO2u/E1i7N+OTXm3vO2scxgS9CkAfxVBoxwp7YQaMwuBGZ6H9?= =?us-ascii?Q?3+4Jqz/IwZAiERZ2fOF91NWcXBKTXJjMWkLlU42bpTjn4uyfnbYUNe6G3P3E?= =?us-ascii?Q?GAa3thiU2zKml1Z7+0c=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)(7416014)(376014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Dec 2025 12:42:20.1538 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a771fb6a-e11d-40fa-4959-08de34c4e589 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: MWH0EPF000971E2.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB6918 Content-Type: text/plain; charset="utf-8" Add a wrapper for the `pci_sriov_get_totalvfs()` helper, allowing drivers to query the number of total SR-IOV virtual functions a PCI device supports. This is useful for components that need to conditionally enable features based on SR-IOV capability. Signed-off-by: Zhi Wang --- rust/kernel/pci.rs | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs index 7fcc5f6022c1..9a82e83dfd30 100644 --- a/rust/kernel/pci.rs +++ b/rust/kernel/pci.rs @@ -514,6 +514,18 @@ pub fn pci_class(&self) -> Class { // SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`. Class::from_raw(unsafe { (*self.as_raw()).class }) } + + /// Returns total number of VFs, or `Err(ENODEV)` if none available. + pub fn sriov_get_totalvfs(&self) -> Result { + // SAFETY: `self.as_raw()` is a valid pointer to a `struct pci_dev= `. + let vfs =3D unsafe { bindings::pci_sriov_get_totalvfs(self.as_raw(= )) }; + + if vfs !=3D 0 { + Ok(vfs) + } else { + Err(ENODEV) + } + } } =20 impl Device { --=20 2.51.0