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

Overview¶

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

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.

#!/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.

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:

netdev@vger.kernel.org

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

drivers@pensando.io