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Thu, 20 Nov 2025 07:03:47 -0800 (PST) Received: from localhost ([2607:f2c0:b141:ac00:5cae:3da9:9913:ff7]) by smtp.gmail.com with UTF8SMTPSA id af79cd13be357-8b3295db58fsm165531085a.37.2025.11.20.07.03.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Nov 2025 07:03:47 -0800 (PST) Date: Thu, 20 Nov 2025 10:03:45 -0500 From: Peter Colberg To: Zhi Wang Cc: Danilo Krummrich , Bjorn Helgaas , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?B?QmrDtnJu?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Abdiel Janulgue , Daniel Almeida , Robin Murphy , Greg Kroah-Hartman , Dave Ertman , Ira Weiny , Leon Romanovsky , linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Alexandre Courbot , Alistair Popple , Joel Fernandes , John Hubbard , Jason Gunthorpe Subject: Re: [PATCH 0/8] rust: pci: add abstractions for SR-IOV capability Message-ID: Mail-Followup-To: Zhi Wang , Danilo Krummrich , Bjorn Helgaas , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?B?QmrDtnJu?= Roy Baron , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Abdiel Janulgue , Daniel Almeida , Robin Murphy , Greg Kroah-Hartman , Dave Ertman , Ira Weiny , Leon Romanovsky , linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Alexandre Courbot , Alistair Popple , Joel Fernandes , John Hubbard , Jason Gunthorpe References: <20251119-rust-pci-sriov-v1-0-883a94599a97@redhat.com> <20251120083213.6c5c01a5.zhiw@nvidia.com> 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-Disposition: inline In-Reply-To: <20251120083213.6c5c01a5.zhiw@nvidia.com> On Thu, Nov 20, 2025 at 08:32:13AM +0200, Zhi Wang wrote: > On Wed, 19 Nov 2025 17:19:04 -0500 > Peter Colberg wrote: > > Hi Peter: > > Thanks for the patches. :) I will test them with nova-core and come back > with Tested-bys. Perfect, thanks Zhi. > Nit: Let's use "kernel vertical" styles on imports. [1] > > [1] https://lore.kernel.org/all/20251105120352.77603-1-dakr@kernel.org/ Thanks, done for patch "samples: rust: add SR-IOV driver sample". Peter > > > Add Rust abstractions for the Single Root I/O Virtualization (SR-IOV) > > capability of a PCI device. Provide a minimal set of wrappers for the > > SR-IOV C API to enable and disable SR-IOV for a device, and query if > > a PCI device is a Physical Function (PF) or Virtual Function (VF). > > > > Using the #[vtable] attribute, extend the pci::Driver trait with an > > optional bus callback sriov_configure() that is invoked when a > > user-space application writes the number of VFs to the sysfs file > > `sriov_numvfs` to enable SR-IOV, or zero to disable SR-IOV [1]. > > > > Add a method physfn() to return the Physical Function (PF) device for > > a Virtual Function (VF) device in the bound device context. Unlike > > for a PCI driver written in C, guarantee that when a VF device is > > bound to a driver, the underlying PF device is bound to a driver, too. > > > > When a device with enabled VFs is unbound from a driver, invoke the > > sriov_configure() callback to disable SR-IOV before the unbind() > > callback. To ensure the guarantee is upheld, call disable_sriov() > > to remove all VF devices if the driver has not done so already. > > > > This series is based on Danilo Krummrich's series "Device::drvdata() > > and driver/driver interaction (auxiliary)" applied to > > driver-core-next, which similarly guarantees that when an auxiliary > > bus device is bound to a driver, the underlying parent device is > > bound to a driver, too [2]. > > > > Add an SR-IOV driver sample that exercises the SR-IOV capability using > > QEMU's 82576 (igb) emulation and was used to test the abstractions > > [3]. > > > > [1] https://docs.kernel.org/PCI/pci-iov-howto.html > > [2] > > https://lore.kernel.org/rust-for-linux/20251020223516.241050-1-dakr@kernel.org/ > > [3] https://www.qemu.org/docs/master/system/devices/igb.html > > > > Signed-off-by: Peter Colberg > > --- > > John Hubbard (1): > > rust: pci: add is_virtfn(), to check for VFs > > > > Peter Colberg (7): > > rust: pci: add is_physfn(), to check for PFs > > rust: pci: add {enable,disable}_sriov(), to control SR-IOV > > capability rust: pci: add num_vf(), to return number of VFs > > rust: pci: add vtable attribute to pci::Driver trait > > rust: pci: add bus callback sriov_configure(), to control > > SR-IOV from sysfs rust: pci: add physfn(), to return PF device for VF > > device samples: rust: add SR-IOV driver sample > > > > MAINTAINERS | 1 + > > rust/kernel/pci.rs | 148 > > ++++++++++++++++++++++++++++++++++ samples/rust/Kconfig > > | 11 +++ samples/rust/Makefile | 1 + > > samples/rust/rust_dma.rs | 1 + > > samples/rust/rust_driver_auxiliary.rs | 1 + > > samples/rust/rust_driver_pci.rs | 1 + > > samples/rust/rust_driver_sriov.rs | 107 ++++++++++++++++++++++++ > > 8 files changed, 271 insertions(+) > > --- > > base-commit: e4addc7cc2dfcc19f1c8c8e47f3834b22cb21559 > > change-id: 20251026-rust-pci-sriov-ca8f501b2ae3 > > > > Best regards, >