netdev - [PATCH RFC v2 virtio 7/7] pds_vdpa: pds

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Date:   Wed, 8 Mar 2023 17:30:46 -0800
From:   Shannon Nelson <shannon.nelson@....com>
To:     <jasowang@...hat.com>, <mst@...hat.com>,
        <virtualization@...ts.linux-foundation.org>,
        <shannon.nelson@....com>, <brett.creeley@....com>,
        <davem@...emloft.net>, <netdev@...r.kernel.org>, <kuba@...nel.org>
CC:     <drivers@...sando.io>
Subject: [PATCH RFC v2 virtio 7/7] pds_vdpa: pds_vdps.rst and Kconfig

Add the documentation and Kconfig entry for pds_vdpa driver.

Signed-off-by: Shannon Nelson <shannon.nelson@....com>
---
 .../ethernet/pensando/pds_vdpa.rst            | 84 +++++++++++++++++++
 MAINTAINERS                                   |  4 +
 drivers/vdpa/Kconfig                          |  8 ++
 3 files changed, 96 insertions(+)
 create mode 100644 Documentation/networking/device_drivers/ethernet/pensando/pds_vdpa.rst

diff --git a/Documentation/networking/device_drivers/ethernet/pensando/pds_vdpa.rst b/Documentation/networking/device_drivers/ethernet/pensando/pds_vdpa.rst
new file mode 100644
index 000000000000..d41f6dd66e3e
--- /dev/null
+++ b/Documentation/networking/device_drivers/ethernet/pensando/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 $6}'`
+
+  # Enable vDPA VF auxiliary device(s) in the PF
+  devlink dev param set pci/$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@...r.kernel.org
+
+For more specific support needs, please use the Pensando driver support
+email::
+
+  drivers@...sando.io
diff --git a/MAINTAINERS b/MAINTAINERS
index cb21dcd3a02a..da981c5bc830 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22120,6 +22120,10 @@ 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..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