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Tue, 30 Jun 2026 23:26:50 -0700 From: Zhi Wang To: , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Zhi Wang , Bjorn Helgaas , David Laight , Subject: [PATCH v3 2/8] rust: pci: add sriov_get_totalvfs() helper Date: Wed, 1 Jul 2026 09:26:16 +0300 Message-ID: <20260701062622.3499033-3-zhiw@nvidia.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260701062622.3499033-1-zhiw@nvidia.com> References: <20260701062622.3499033-1-zhiw@nvidia.com> Precedence: bulk X-Mailing-List: linux-pci@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: MWH0EPF000A6733:EE_|IA1PR12MB8189:EE_ X-MS-Office365-Filtering-Correlation-Id: 9390ac31-4961-46da-213b-08ded739d0a3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|36860700016|376014|7416014|82310400026|1800799024|18002099003|13003099007|22082099003|11063799006|56012099006|6133799003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: /OY120A9XJLpTowCAetq93qIxW9Qmg6aaVDrhK7ZoL3EfeyB9s3uCk+FkiTzG6I7M6H1WCJ7dnnekaK0O0efGiH96BsrHDygiMgx4Mz8c1aXBJqEeQ5Fz2hSaCJu4sc5ha2CH+PINZE5lSgkoW9u/7onNE3P0DsegkVPeEljVGGkHLxU0A4w8xDz+I3Tu/aNn/GGJ7LblwrBuQlC4/SKRvnJhr+/CGKWNyjbD3G0xsb1M3c51ZWztELTxDAf8rErMJY5BomZZDifFCFeDrvbL+Qi51zj300lGHDlOs0giR9RUaDeVcsl9/ZC2Wt9WNG+uLdIaKUL7M0kDhVggH7R0M8m4F2GSRAREU75rPk3bw6KfabNlAHumq6ziyG6pQ32RwQRtCoh/MfiGbps07GrX6e7qbxGgzDhxGPgbjiuTdxSB9vZktwvmNlpApN6u0w3 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2026 06:27:24.5409 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9390ac31-4961-46da-213b-08ded739d0a3 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: MWH0EPF000A6733.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8189 Expose pci_sriov_get_totalvfs() to Rust PCI drivers so they can query how many SR-IOV VFs a device supports. Cc: Alexandre Courbot Cc: Bjorn Helgaas Cc: David Laight Cc: Gary Guo Cc: linux-pci@vger.kernel.org Link: https://lore.kernel.org/all/DJHPRE4TGGT8.BUTMYOF5YE05@nvidia.com/ Signed-off-by: Zhi Wang --- rust/kernel/pci.rs | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs index 5071cae6543f..21c51981c02e 100644 --- a/rust/kernel/pci.rs +++ b/rust/kernel/pci.rs @@ -450,6 +450,17 @@ 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 the total number of VFs, or 0 if SR-IOV is not available. + #[inline] + pub fn sriov_get_totalvfs(&self) -> u16 { + // SAFETY: `self.as_raw()` is a valid pointer to a `struct pci_dev`. + let total_vfs = unsafe { bindings::pci_sriov_get_totalvfs(self.as_raw()) }; + + // CAST: The C helper returns `unsigned int`, but the value originates + // from TotalVFs/driver_max_VFs, so this cast cannot truncate. + total_vfs as u16 + } } impl<'a> Device> { -- 2.51.0