On Thu, Mar 23, 2023 at 3:11 AM Shannon Nelson <shannon.nelson@xxxxxxx> wrote:
>
> Add the documentation and Kconfig entry for pds_vdpa driver.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@xxxxxxx>
> ---
> .../device_drivers/ethernet/amd/pds_vdpa.rst | 84 +++++++++++++++++++
> .../device_drivers/ethernet/index.rst | 1 +
I wonder if it's better to have a dedicated directory for vDPA.
> MAINTAINERS | 4 +
> drivers/vdpa/Kconfig | 8 ++
> 4 files changed, 97 insertions(+)
> create mode 100644 Documentation/networking/device_drivers/ethernet/amd/pds_vdpa.rst
>
> diff --git a/Documentation/networking/device_drivers/ethernet/amd/pds_vdpa.rst b/Documentation/networking/device_drivers/ethernet/amd/pds_vdpa.rst
> new file mode 100644
> index 000000000000..d41f6dd66e3e
> --- /dev/null
> +++ b/Documentation/networking/device_drivers/ethernet/amd/pds_vdpa.rst
> @@ -0,0 +1,84 @@
> +.. 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.
> +
> +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.
> +
> +.. code-block:: bash
> +
> + #!/bin/bash
> +
> + modprobe pds_core
> + modprobe vdpa
> + modprobe pds_vdpa
> +
> + PF_BDF=`grep -H "vDPA.*1" /sys/kernel/debug/pds_core/*/viftypes | head -1 | awk -F / '{print $6}'`
This seems to require debugfs, I wonder if it's better to switch to
using /sys/bus/pci ?
Others look good.
Thanks
> +
> + # Enable vDPA VF auxiliary device(s) in the PF
> + devlink dev param set pci/$PF_BDF name enable_vnet value true cmode runtime
> +
> + # 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@xxxxxxxxxxxxxxx
> +
> +For more specific support needs, please use the Pensando driver support
> +email::
> +
> + drivers@xxxxxxxxxxx
> diff --git a/Documentation/networking/device_drivers/ethernet/index.rst b/Documentation/networking/device_drivers/ethernet/index.rst
> index eaaf284e69e6..88dd38c7eb6d 100644
> --- a/Documentation/networking/device_drivers/ethernet/index.rst
> +++ b/Documentation/networking/device_drivers/ethernet/index.rst
> @@ -14,6 +14,7 @@ Contents:
> 3com/vortex
> amazon/ena
> amd/pds_core
> + amd/pds_vdpa
> altera/altera_tse
> aquantia/atlantic
> chelsio/cxgb
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 95b5f25a2c06..2af133861068 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22108,6 +22108,10 @@ SNET DPU VIRTIO DATA PATH ACCELERATOR
> R: Alvaro Karsz <alvaro.karsz@xxxxxxxxxxxxx>
> F: drivers/vdpa/solidrun/
>
> +PDS DSC VIRTIO DATA PATH ACCELERATOR
> +R: Shannon Nelson <shannon.nelson@xxxxxxx>
> +F: drivers/vdpa/pds/
> +
> VIRTIO BALLOON
> M: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
> M: David Hildenbrand <david@xxxxxxxxxx>
> diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
> index cd6ad92f3f05..c910cb119c1b 100644
> --- a/drivers/vdpa/Kconfig
> +++ b/drivers/vdpa/Kconfig
> @@ -116,4 +116,12 @@ config ALIBABA_ENI_VDPA
> This driver includes a HW monitor device that
> reads health values from the DPU.
>
> +config PDS_VDPA
> + tristate "vDPA driver for AMD/Pensando DSC devices"
> + depends on PDS_CORE
> + help
> + VDPA network driver for AMD/Pensando's PDS Core devices.
> + With this driver, the VirtIO dataplane can be
> + offloaded to an AMD/Pensando DSC device.
> +
> endif # VDPA
> --
> 2.17.1
>
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