PCI VFIO driver for the AMD/Pensando DSC adapter family

pds-vfio-pci 개요

AMD/Pensando(R) DSC adapter family용 PCI VFIO driver

AMD/Pensando Linux VFIO PCI Device Driver

Copyright(c) 2023 Advanced Micro Devices, Inc.

개요

`pds-vfio-pci` module은 DSC hardware에서 Live Migration이 가능한 Virtual Function(`VF`) device를 지원하는 PCI driver입니다.

.. SPDX-License-Identifier: GPL-2.0+
.. note: can be edited and viewed with /usr/bin/formiko-vim

==========================================================
PCI VFIO driver for the AMD/Pensando(R) DSC adapter family
==========================================================

AMD/Pensando Linux VFIO PCI Device Driver
Copyright(c) 2023 Advanced Micro Devices, Inc.

Overview
========

The ``pds-vfio-pci`` module is a PCI driver that supports Live Migration
capable Virtual Function (VF) devices in the DSC hardware.

VF 생성, driver override와 bind

Device 사용

`pds-vfio-pci` device는 여러 configuration 단계를 거쳐 활성화하며, SR-IOV Virtual Function device의 생성과 활성화는 `pds_core` driver에 의존합니다.

아래 단계는 VF와 `pds_core` driver가 만든 연관 auxiliary device를 해당 driver에 bind합니다. 이 예시는 `pds_core`와 `pds-vfio-pci` module이 이미 load되어 있다고 가정합니다.

#!/bin/bash

PF_BUS="0000:60"
PF_BDF="0000:60:00.0"
VF_BDF="0000:60:00.1"

# VF device에 non-vfio VF driver가 probe하지 못하게 함
echo 0 > /sys/class/pci_bus/$PF_BUS/device/$PF_BDF/sriov_drivers_autoprobe

# pds_core를 통해 Live Migration용 VF 하나 생성
echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs

# VF가 pds-vfio-pci driver에 bind되도록 허용
echo "pds-vfio-pci" > /sys/class/pci_bus/$PF_BUS/device/$VF_BDF/driver_override

# VF를 pds-vfio-pci driver에 bind
echo "$VF_BDF" > /sys/bus/pci/drivers/pds-vfio-pci/bind

• `PF_BUS`, `PF_BDF`, `VF_BDF`에 대상 PCI 주소를 지정합니다.
• `sriov_drivers_autoprobe`에 `0`을 써 일반 VF driver의 자동 probe를 막습니다.
• `pds_core`의 `sriov_numvfs`에 `1`을 써 Live Migration용 VF 하나를 생성합니다.
• VF의 `driver_override`에 `pds-vfio-pci`를 기록하여 bind 대상 driver를 제한합니다.
• `pds-vfio-pci/bind`에 `VF_BDF`를 써 VF를 명시적으로 bind합니다.

위 단계를 수행하면 `/dev/vfio/<iommu_group>`에 해당하는 file이 생성되어 있어야 합니다.

Using the device
================

The pds-vfio-pci device is enabled via multiple configuration steps and
depends on the ``pds_core`` driver to create and enable SR-IOV Virtual
Function devices.

Shown below are the steps to bind the driver to a VF and also to the
associated auxiliary device created by the ``pds_core`` driver. This
example assumes the pds_core and pds-vfio-pci modules are already
loaded.

.. code-block:: bash
  :name: example-setup-script

  #!/bin/bash

  PF_BUS="0000:60"
  PF_BDF="0000:60:00.0"
  VF_BDF="0000:60:00.1"

  # Prevent non-vfio VF driver from probing the VF device
  echo 0 > /sys/class/pci_bus/$PF_BUS/device/$PF_BDF/sriov_drivers_autoprobe

  # Create single VF for Live Migration via pds_core
  echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs

  # Allow the VF to be bound to the pds-vfio-pci driver
  echo "pds-vfio-pci" > /sys/class/pci_bus/$PF_BUS/device/$VF_BDF/driver_override

  # Bind the VF to the pds-vfio-pci driver
  echo "$VF_BDF" > /sys/bus/pci/drivers/pds-vfio-pci/bind

After performing the steps above, a file in /dev/vfio/<iommu_group>
should have been created.

Driver 활성화와 지원

Driver 활성화

Driver는 표준 kernel configuration system을 통해 활성화하며 다음과 같은 make command를 사용합니다.

make oldconfig/menuconfig/etc.

Driver의 menu 위치는 다음과 같습니다.

-> Device Drivers
  -> VFIO Non-Privileged userspace driver framework
    -> VFIO support for PDS PCI devices

지원

일반 Linux networking 지원은 Pensando 담당자가 확인하는 netdev mailing list를 이용하십시오.

[email protected]

더 구체적인 지원이 필요하면 Pensando driver support email을 이용하십시오.

[email protected]

Enabling the driver
===================

The driver is enabled via the standard kernel configuration system,
using the make command::

  make oldconfig/menuconfig/etc.

The driver is located in the menu structure at:

  -> Device Drivers
    -> VFIO Non-Privileged userspace driver framework
      -> VFIO support for PDS PCI devices

Support
=======

For general Linux networking support, please use the netdev mailing
list, which is monitored by Pensando personnel::

  [email protected]

For more specific support needs, please use the Pensando driver support
email::

  [email protected]