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Wed, 11 Nov 2026 14:34:04 -0800 From: Simon Song To: , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 04/11] rust: pci: add num_vf(), to return number of VFs Date: Wed, 11 Nov 2026 14:33:29 -0800 Message-ID: <20261111223337.508989-5-xinmengs@nvidia.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20261111223337.508989-1-xinmengs@nvidia.com> References: <20261111223337.508989-1-xinmengs@nvidia.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail201.nvidia.com (10.129.68.8) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY1PEPF0001AE18:EE_|PH7PR12MB9067:EE_ X-MS-Office365-Filtering-Correlation-Id: f6c714c5-75bc-40c5-881c-08df4043f15b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|7416014|376014|23010399003|1800799024|18002099003|22082099003|6133799003|261009223027099003|11063799006|56012099006|261102123227099003|261021121427099003|10067099003; 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Expose the query in the PCI core callback context and return u16, matching the type of the VF count stored by the PCI core. Signed-off-by: Peter Colberg Signed-off-by: Zhi Wang Reviewed-by: Alexandre Courbot Signed-off-by: Simon Song --- rust/helpers/pci.c | 5 +++++ rust/kernel/pci/iov.rs | 13 +++++++++++++ 2 files changed, 18 insertions(+) diff --git a/rust/helpers/pci.c b/rust/helpers/pci.c index a87b5a77efef..57c28ddeeb9b 100644 --- a/rust/helpers/pci.c +++ b/rust/helpers/pci.c @@ -52,6 +52,11 @@ __rust_helper void rust_helper_pci_disable_sriov(struct pci_dev *pdev) pci_disable_sriov(pdev); } +__rust_helper int rust_helper_pci_num_vf(struct pci_dev *pdev) +{ + return pci_num_vf(pdev); +} + __rust_helper unsigned int rust_helper_pci_sriov_get_totalvfs(struct pci_dev *pdev) { diff --git a/rust/kernel/pci/iov.rs b/rust/kernel/pci/iov.rs index 18e42b2d3965..78e279169be1 100644 --- a/rust/kernel/pci/iov.rs +++ b/rust/kernel/pci/iov.rs @@ -11,6 +11,19 @@ prelude::*, // }; +impl Device> { + /// Returns the number of Virtual Functions (VF) enabled for a Physical Function (PF). + /// + /// Returns zero when `CONFIG_PCI_IOV` is disabled. + #[inline] + pub fn num_vf(&self) -> u16 { + // SAFETY: `self.as_raw()` is valid and this call runs in the PCI core callback context. + unsafe { bindings::pci_num_vf(self.as_raw()) } + .try_into() + .expect("pdev->sriov->num_VFs is u16") + } +} + impl Device> { /// Enable the Single Root I/O Virtualization (SR-IOV) capability for this device, /// where `nr_virtfn` is number of Virtual Functions (VF) to enable. -- 2.43.7