Re: [PATCH 0/5] vDPA support

[Jason Wang]

On 2020/1/21 äå4:44, Tian, Kevin wrote:
> > From: Jason Wang
> > Sent: Thursday, January 16, 2020 8:42 PM
> >
> > Hi all:
> >
> > Based on the comments and discussion for mdev based hardware virtio
> > offloading support[1]. A different approach to support vDPA device is
> > proposed in this series.
> Can you point to the actual link which triggered the direction change?
> A quick glimpse in that thread doesn't reveal such information...


Right, please see this link, the actual discussion happens on the thread 
of virtual-bus for some reasons...

https://patchwork.ozlabs.org/patch/1195895/

Thanks


> > Instead of leveraging VFIO/mdev which may not work for some
> > vendors. This series tries to introduce a dedicated vDPA bus and
> > leverage vhost for userspace drivers. This help for the devices that
> > are not fit for VFIO and may reduce the conflict when try to propose a
> > bus template for virtual devices in [1].
> >
> > The vDPA support is split into following parts:
> >
> > 1) vDPA core (bus, device and driver abstraction)
> > 2) virtio vDPA transport for kernel virtio driver to control vDPA
> >     device
> > 3) vhost vDPA bus driver for userspace vhost driver to control vDPA
> >     device
> > 4) vendor vDPA drivers
> > 5) management API
> >
> > Both 1) and 2) are included in this series. Tiwei will work on part
> > 3). For 4), Ling Shan will work and post IFCVF driver. For 5) we leave
> > it to vendor to implement, but it's better to come into an agreement
> > for management to create/configure/destroy vDPA device.
> >
> > The sample driver is kept but renamed to vdap_sim. An on-chip IOMMU
> > implementation is added to sample device to make it work for both
> > kernel virtio driver and userspace vhost driver. It implements a sysfs
> > based management API, but it can switch to any other (e.g devlink) if
> > necessary.
> >
> > Please refer each patch for more information.
> >
> > Comments are welcomed.
> >
> > [1] https://lkml.org/lkml/2019/11/18/261
> >
> > Jason Wang (5):
> >    vhost: factor out IOTLB
> >    vringh: IOTLB support
> >    vDPA: introduce vDPA bus
> >    virtio: introduce a vDPA based transport
> >    vdpasim: vDPA device simulator
> >
> >   MAINTAINERS                    |   2 +
> >   drivers/vhost/Kconfig          |   7 +
> >   drivers/vhost/Kconfig.vringh   |   1 +
> >   drivers/vhost/Makefile         |   2 +
> >   drivers/vhost/net.c            |   2 +-
> >   drivers/vhost/vhost.c          | 221 +++------
> >   drivers/vhost/vhost.h          |  36 +-
> >   drivers/vhost/vhost_iotlb.c    | 171 +++++++
> >   drivers/vhost/vringh.c         | 434 +++++++++++++++++-
> >   drivers/virtio/Kconfig         |  15 +
> >   drivers/virtio/Makefile        |   2 +
> >   drivers/virtio/vdpa/Kconfig    |  26 ++
> >   drivers/virtio/vdpa/Makefile   |   3 +
> >   drivers/virtio/vdpa/vdpa.c     | 141 ++++++
> >   drivers/virtio/vdpa/vdpa_sim.c | 796
> > +++++++++++++++++++++++++++++++++
> >   drivers/virtio/virtio_vdpa.c   | 400 +++++++++++++++++
> >   include/linux/vdpa.h           | 191 ++++++++
> >   include/linux/vhost_iotlb.h    |  45 ++
> >   include/linux/vringh.h         |  36 ++
> >   19 files changed, 2327 insertions(+), 204 deletions(-)
> >   create mode 100644 drivers/vhost/vhost_iotlb.c
> >   create mode 100644 drivers/virtio/vdpa/Kconfig
> >   create mode 100644 drivers/virtio/vdpa/Makefile
> >   create mode 100644 drivers/virtio/vdpa/vdpa.c
> >   create mode 100644 drivers/virtio/vdpa/vdpa_sim.c
> >   create mode 100644 drivers/virtio/virtio_vdpa.c
> >   create mode 100644 include/linux/vdpa.h
> >   create mode 100644 include/linux/vhost_iotlb.h
> >
> > --
> > 2.19.1