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.. SPDX-License-Identifier: GPL-2.0+
.. note: can be edited and viewed with /usr/bin/formiko-vim
==========================================================
PCI vDPA driver for the AMD/Pensando(R) DSC adapter family
==========================================================
AMD/Pensando vDPA VF Device Driver
Copyright(c) 2023 Advanced Micro Devices, Inc
Overview
========
The ``pds_vdpa`` driver is an auxiliary bus driver that supplies
a vDPA device for use by the virtio network stack. It is used with
the Pensando Virtual Function devices that offer vDPA and virtio queue
services. It depends on the ``pds_core`` driver and hardware for the PF
and VF PCI handling as well as for device configuration services.
Using the device
================
The ``pds_vdpa`` device is enabled via multiple configuration steps and
depends on the ``pds_core`` driver to create and enable SR-IOV Virtual
Function devices. After the VFs are enabled, we enable the vDPA service
in the ``pds_core`` device to create the auxiliary devices used by pds_vdpa.
Example steps:
.. code-block:: bash
#!/bin/bash
modprobe pds_core
modprobe vdpa
modprobe pds_vdpa
PF_BDF=`ls /sys/module/pds_core/drivers/pci\:pds_core/*/sriov_numvfs | awk -F / '{print $7}'`
# Enable vDPA VF auxiliary device(s) in the PF
devlink dev param set pci/$PF_BDF name enable_vnet cmode runtime value true
# Create a VF for vDPA use
echo 1 > /sys/bus/pci/drivers/pds_core/$PF_BDF/sriov_numvfs
# Find the vDPA services/devices available
PDS_VDPA_MGMT=`vdpa mgmtdev show | grep vDPA | head -1 | cut -d: -f1`
# Create a vDPA device for use in virtio network configurations
vdpa dev add name vdpa1 mgmtdev $PDS_VDPA_MGMT mac 00:11:22:33:44:55
# Set up an ethernet interface on the vdpa device
modprobe virtio_vdpa
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
-> Network device support (NETDEVICES [=y])
-> Ethernet driver support
-> Pensando devices
-> Pensando Ethernet PDS_VDPA Support
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
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