netdev - [PATCH v4 virtio 10/10] pds_vdpa: pds

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Message-ID: <20230425212602.1157-11-shannon.nelson@amd.com>
Date:   Tue, 25 Apr 2023 14:26:02 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     <jasowang@...hat.com>, <mst@...hat.com>,
        <virtualization@...ts.linux-foundation.org>,
        <shannon.nelson@....com>, <brett.creeley@....com>,
        <netdev@...r.kernel.org>
CC:     <drivers@...sando.io>
Subject: [PATCH v4 virtio 10/10] 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>
---
 .../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 6ac562e0381e..93210a8ac74f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22148,6 +22148,10 @@ 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
+	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