Commit a8d70602 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost 

Pull virtio updates from Michael Tsirkin:

 - resume support in vdpa/solidrun

 - structure size optimizations in virtio_pci

 - new pds_vdpa driver

 - immediate initialization mechanism for vdpa/ifcvf

 - interrupt bypass for vdpa/mlx5

 - multiple worker support for vhost

 - viirtio net in Intel F2000X-PL support for vdpa/ifcvf

 - fixes, cleanups all over the place

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (48 commits)
  vhost: Make parameter name match of vhost_get_vq_desc()
  vduse: fix NULL pointer dereference
  vhost: Allow worker switching while work is queueing
  vhost_scsi: add support for worker ioctls
  vhost: allow userspace to create workers
  vhost: replace single worker pointer with xarray
  vhost: add helper to parse userspace vring state/file
  vhost: remove vhost_work_queue
  vhost_scsi: flush IO vqs then send TMF rsp
  vhost_scsi: convert to vhost_vq_work_queue
  vhost_scsi: make SCSI cmd completion per vq
  vhost_sock: convert to vhost_vq_work_queue
  vhost: convert poll work to be vq based
  vhost: take worker or vq for flushing
  vhost: take worker or vq instead of dev for queueing
  vhost, vhost_net: add helper to check if vq has work
  vhost: add vhost_worker pointer to vhost_virtqueue
  vhost: dynamically allocate vhost_worker
  vhost: create worker at end of vhost_dev_set_owner
  virtio_bt: call scheduler when we free unused buffs
  ...
parents e8069f5a 9e396a2f

Documentation/networking/device_drivers/ethernet/amd/pds_vdpa.rst

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.. 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

Documentation/networking/device_drivers/ethernet/index.rst

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@@ -15,6 +15,7 @@ Contents: 
   amazon/ena

   altera/altera_tse

   amd/pds_core

   amd/pds_vdpa

   aquantia/atlantic

   chelsio/cxgb

   cirrus/cs89x0

MAINTAINERS

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@@ -22535,6 +22535,10 @@ F: include/linux/vringh.h 
F:	include/uapi/linux/virtio_*.h

F:	tools/virtio/









PDS DSC VIRTIO DATA PATH ACCELERATOR









R:	Shannon Nelson <shannon.nelson@amd.com>









F:	drivers/vdpa/pds/

















VIRTIO CRYPTO DRIVER









M:	Gonglei <arei.gonglei@huawei.com>









L:	virtualization@lists.linux-foundation.org

























drivers/bluetooth/virtio_bt.c



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@@ -79,6 +79,7 @@ static int virtbt_close_vdev(struct virtio_bluetooth *vbt)

















		while ((skb = virtqueue_detach_unused_buf(vq)))









			kfree_skb(skb);









		cond_resched();









	}



















	return 0;
































drivers/char/virtio_console.c



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@@ -1936,6 +1936,7 @@ static void remove_vqs(struct ports_device *portdev)







		flush_bufs(vq, true);









		while ((buf = virtqueue_detach_unused_buf(vq)))









			free_buf(buf, true);









		cond_resched();









	}









	portdev->vdev->config->del_vqs(portdev->vdev);









	kfree(portdev->in_vqs);