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Wed, 30 Sep 2026 10:38:07 -0700 Received: from inno-dell (10.127.8.11) by mail.nvidia.com (10.129.68.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49 via Frontend Transport; Wed, 30 Sep 2026 10:38:01 -0700 Date: Wed, 30 Sep 2026 20:37:58 +0300 From: Zhi Wang To: Alexandre Courbot CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v9 1/1] rust: pci: add extended capability and SR-IOV support Message-ID: <20260930203758.4d8f1b95@inno-dell> In-Reply-To: References: <2e9d992509299c2f13de48109c4c933f53817acb.1787830828.git.zhiw@nvidia.com> X-Mailer: Claws Mail 4.3.1 (GTK 3.24.52; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF00000017:EE_|DS2PR12MB9589:EE_ X-MS-Office365-Filtering-Correlation-Id: 52dd15bf-6e5d-4c29-254e-08df1f19a6b5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700016|82310400026|23010399003|1800799024|10067099003|11063799006|56012099006|4143699003|6133799003|13003099007|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: RbSYGvrYkpTXSKrzqsDdoyKG6XDVyWkrmyUfsk9XDVliX/ib4X+qcuMlWf+t3GxAaeM8LG0DuwUCPf577T41iwOP88wtSb+2ApfhsMxsWdpBt6/PCkZBOGzD1sKwZrNVk2Q0KQ38IgAbYTYD1qPBtNMKxyHyKefDe7rrf59sY7FaMfGy5rEKRP/AzORu9t+2WyccI1lwlbmCBio0Jl76psdLwLJ9xE6sla9aO829IzkNKXlOn0MZoJdL8VIzaOSjNyPwrYYMoQuixKQMDgV2yAWdPrw937nV+VCoR4dZd/eU0Pel/DmhxHPnj+tUnK17vrUhmy2M96M3ljqhnUVmxvtheNnzKZNvfQQD2gu2Tjer+yzJMwM3RYlx2dFNoI223OOD91ofS5FvjK4tZqwbcxeadeOUXz8hpXtc929mQuwvGAkf9Dr2CY2RML1RxDGO X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Sep 2026 17:38:33.9856 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 52dd15bf-6e5d-4c29-254e-08df1f19a6b5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000017.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS2PR12MB9589 On Sun, 06 Sep 2026 10:24:39 +0900 "Alexandre Courbot" wrote: Gentle ping for the next step. :) > On Thu Aug 27, 2026 at 9:18 PM JST, Zhi Wang wrote: > > Rust PCI drivers have no typed interface for locating and accessing > > PCIe extended capabilities. > > > > The SR-IOV extended capability describes VF topology and VF BARs. > > Expose this information through the Rust PCI abstraction so drivers > > can use the existing typed configuration-space accessors instead of > > raw bindings. > > > > Define ExtCapability to associate a capability ID with a register > > layout, and add ConfigSpace::find_ext_capability() to locate and > > project that layout. Bound the view at the next capability or the > > end of extended configuration space. Add ExtSriovRegs and a decoded > > VF BAR iterator that reads and validates all six VF BAR register > > slots up front, yields decoded BAR addresses and widths in logical > > order, and keeps the raw configuration-space slot advancement > > internal. Since PCI_EXT_CAP_NEXT() is a function-like macro, expose > > it through a Rust helper. > > > > Keep raw SR-IOV registers private because PCI core owns their > > state. Expose the current First VF Offset through a read-only > > accessor because the Nova GSP ABI needs the raw 16-bit First VF > > Offset in Routing ID space. The pci_iov_virtfn_devfn() helper > > instead returns the low eight bits of a calculated VF Routing ID. > > > > Link: > > https://lore.kernel.org/rust-for-linux/20260818084633.1673214-2-zhiw@nvidia.com/ > > Cc: Alexandre Courbot Cc: Gary Guo > > Signed-off-by: Zhi Wang > > Reviewed-by: Alexandre Courbot