netdev - [RFC PATCH net-next 19/19] pds_vdpa: add Kconfig entry and pds

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Message-Id: <20221118225656.48309-20-snelson@pensando.io>
Date:   Fri, 18 Nov 2022 14:56:56 -0800
From:   Shannon Nelson <snelson@...sando.io>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org
Cc:     drivers@...sando.io, Shannon Nelson <snelson@...sando.io>
Subject: [RFC PATCH net-next 19/19] pds_vdpa: add Kconfig entry and pds_vdpa.rst

Signed-off-by: Shannon Nelson <snelson@...sando.io>
---
 .../ethernet/pensando/pds_vdpa.rst            | 85 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 drivers/vdpa/Kconfig                          |  7 ++
 3 files changed, 93 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..c517f337d212
--- /dev/null
+++ b/Documentation/networking/device_drivers/ethernet/pensando/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 Pensando(R) DSC adapter family
+==========================================================
+
+Pensando vDPA VF Device Driver
+Copyright(c) 2022 Pensando Systems, Inc
+
+Overview
+========
+
+The ``pds_vdpa`` driver is a PCI and auxiliary bus driver and 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 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. This
+example assumes the pds_core and pds_vdpa modules are already
+loaded.
+
+.. code-block:: bash
+
+  #!/bin/bash
+
+  modprobe pds_core
+  modprobe pds_vdpa
+
+  PF_BDF=`grep "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 a4f989fa8192..a4d96e854757 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16152,6 +16152,7 @@ L:	netdev@...r.kernel.org
 S:	Supported
 F:	Documentation/networking/device_drivers/ethernet/pensando/
 F:	drivers/net/ethernet/pensando/
+F:	drivers/vdpa/pds/
 F:	include/linux/pds/
 
 PER-CPU MEMORY ALLOCATOR
diff --git a/drivers/vdpa/Kconfig b/drivers/vdpa/Kconfig
index 50f45d037611..1c44df18f3da 100644
--- a/drivers/vdpa/Kconfig
+++ b/drivers/vdpa/Kconfig
@@ -86,4 +86,11 @@ config ALIBABA_ENI_VDPA
 	  VDPA driver for Alibaba ENI (Elastic Network Interface) which is built upon
 	  virtio 0.9.5 specification.
 
+config PDS_VDPA
+	tristate "vDPA driver for Pensando DSC devices"
+	select VHOST_RING
+	depends on PDS_CORE
+	help
+	  VDPA network driver for Pensando's PDS Core devices.
+
 endif # VDPA
-- 
2.17.1