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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Apr 2023 21:26:27.0276 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a92ab5c-04f5-45ae-882c-08db45d3ba6d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT105.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB8539 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Add the documentation and Kconfig entry for pds_vdpa driver. Signed-off-by: Shannon Nelson Reviewed-by: Simon Horman --- .../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@vger.kernel.org + +For more specific support needs, please use the Pensando driver support +email:: + + drivers@pensando.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 F: drivers/vdpa/solidrun/ +PDS DSC VIRTIO DATA PATH ACCELERATOR +R: Shannon Nelson +F: drivers/vdpa/pds/ + VIRTIO BALLOON M: "Michael S. Tsirkin" M: David Hildenbrand 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