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Sun, 24 Oct 2021 01:31:33 -0700 From: Yishai Hadas To: , , , CC: , , , , , , , , Subject: [PATCH V3 mlx5-next 01/13] PCI/IOV: Add pci_iov_vf_id() to get VF index Date: Sun, 24 Oct 2021 11:30:07 +0300 Message-ID: <20211024083019.232813-2-yishaih@nvidia.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20211024083019.232813-1-yishaih@nvidia.com> References: <20211024083019.232813-1-yishaih@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c8203ec9-6178-4393-acf4-08d996c8b258 X-MS-TrafficTypeDiagnostic: MW3PR12MB4506: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.32;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid01.nvidia.com;CAT:NONE;SFS:(4636009)(46966006)(36840700001)(26005)(6666004)(82310400003)(54906003)(7636003)(107886003)(356005)(186003)(5660300002)(8676002)(2906002)(2616005)(36756003)(7696005)(508600001)(110136005)(83380400001)(4326008)(1076003)(426003)(6636002)(47076005)(8936002)(70586007)(70206006)(336012)(36860700001)(86362001)(316002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Oct 2021 08:31:37.7628 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c8203ec9-6178-4393-acf4-08d996c8b258 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.32];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT037.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4506 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jason Gunthorpe The PCI core uses the VF index internally, often called the vf_id, during the setup of the VF, eg pci_iov_add_virtfn(). This index is needed for device drivers that implement live migration for their internal operations that configure/control their VFs. Specifically, mlx5_vfio_pci driver that is introduced in coming patches from this series needs it and not the bus/device/function which is exposed today. Add pci_iov_vf_id() which computes the vf_id by reversing the math that was used to create the bus/device/function. Signed-off-by: Yishai Hadas Signed-off-by: Jason Gunthorpe Acked-by: Bjorn Helgaas Signed-off-by: Leon Romanovsky --- drivers/pci/iov.c | 14 ++++++++++++++ include/linux/pci.h | 8 +++++++- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index dafdc652fcd0..e7751fa3fe0b 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -33,6 +33,20 @@ int pci_iov_virtfn_devfn(struct pci_dev *dev, int vf_id) } EXPORT_SYMBOL_GPL(pci_iov_virtfn_devfn); +int pci_iov_vf_id(struct pci_dev *dev) +{ + struct pci_dev *pf; + + if (!dev->is_virtfn) + return -EINVAL; + + pf = pci_physfn(dev); + return (((dev->bus->number << 8) + dev->devfn) - + ((pf->bus->number << 8) + pf->devfn + pf->sriov->offset)) / + pf->sriov->stride; +} +EXPORT_SYMBOL_GPL(pci_iov_vf_id); + /* * Per SR-IOV spec sec 3.3.10 and 3.3.11, First VF Offset and VF Stride may * change when NumVFs changes. diff --git a/include/linux/pci.h b/include/linux/pci.h index cd8aa6fce204..2337512e67f0 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2153,7 +2153,7 @@ void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar); #ifdef CONFIG_PCI_IOV int pci_iov_virtfn_bus(struct pci_dev *dev, int id); int pci_iov_virtfn_devfn(struct pci_dev *dev, int id); - +int pci_iov_vf_id(struct pci_dev *dev); int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn); void pci_disable_sriov(struct pci_dev *dev); @@ -2181,6 +2181,12 @@ static inline int pci_iov_virtfn_devfn(struct pci_dev *dev, int id) { return -ENOSYS; } + +static inline int pci_iov_vf_id(struct pci_dev *dev) +{ + return -ENOSYS; +} + static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn) { return -ENODEV; } -- 2.18.1