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Message-ID: <CACGkMEvxzRuW2i=3=wv=B7J8UfytxwRoA3SJRexuOgLzJtmZ3Q@mail.gmail.com>
Date: Mon, 15 May 2023 13:07:16 +0800
From: Jason Wang <jasowang@...hat.com>
To: Shannon Nelson <shannon.nelson@....com>
Cc: mst@...hat.com, virtualization@...ts.linux-foundation.org,
brett.creeley@....com, netdev@...r.kernel.org, simon.horman@...igine.com,
drivers@...sando.io
Subject: Re: [PATCH v5 virtio 11/11] pds_vdpa: pds_vdps.rst and Kconfig
On Thu, May 4, 2023 at 2:13 AM Shannon Nelson <shannon.nelson@....com> wrote:
>
> Add the documentation and Kconfig entry for pds_vdpa driver.
>
> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
> ---
> .../device_drivers/ethernet/amd/pds_vdpa.rst | 85 +++++++++++++++++++
> .../device_drivers/ethernet/index.rst | 1 +
> MAINTAINERS | 4 +
> drivers/vdpa/Kconfig | 8 ++
> 4 files changed, 98 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..587927d3de92
> --- /dev/null
> +++ b/Documentation/networking/device_drivers/ethernet/amd/pds_vdpa.rst
> @@ -0,0 +1,85 @@
> +.. 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@...r.kernel.org
> +
> +For more specific support needs, please use the Pensando driver support
> +email::
> +
> + drivers@...sando.io
> diff --git a/Documentation/networking/device_drivers/ethernet/index.rst b/Documentation/networking/device_drivers/ethernet/index.rst
> index 417ca514a4d0..94ecb67c0885 100644
> --- a/Documentation/networking/device_drivers/ethernet/index.rst
> +++ b/Documentation/networking/device_drivers/ethernet/index.rst
> @@ -15,6 +15,7 @@ Contents:
> amazon/ena
> altera/altera_tse
> amd/pds_core
> + amd/pds_vdpa
> aquantia/atlantic
> chelsio/cxgb
> cirrus/cs89x0
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ebd26b3ca90e..c565b71ce56f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22200,6 +22200,10 @@ SNET DPU VIRTIO DATA PATH ACCELERATOR
> R: Alvaro Karsz <alvaro.karsz@...id-run.com>
> F: drivers/vdpa/solidrun/
>
> +PDS DSC VIRTIO DATA PATH ACCELERATOR
> +R: Shannon Nelson <shannon.nelson@....com>
> +F: drivers/vdpa/pds/
> +
> VIRTIO BALLOON
> M: "Michael S. Tsirkin" <mst@...hat.com>
> M: David Hildenbrand <david@...hat.com>
> diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
> index cd6ad92f3f05..2ee1b288691d 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
Need to select VIRTIO_PCI_LIB?
Thanks
> + 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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