On Fri, Sep 20, 2019 at 04:20:44PM +0800, Jason Wang wrote: > Hi all: > > There are hardware that can do virtio datapath offloading while having > its own control path. This path tries to implement a mdev based > unified API to support using kernel virtio driver to drive those > devices. This is done by introducing a new mdev transport for virtio > (virtio_mdev) and register itself as a new kind of mdev driver. Then > it provides a unified way for kernel virtio driver to talk with mdev > device implementation. This is actually simple enough that I'm inclined to just put this into linux-next. This mixes virtio and vfio so the code can thinkably be merged through either tree. Alex, any strong opinions on any of this? > Though the series only contain kernel driver support, the goal is to > make the transport generic enough to support userspace drivers. This > means vhost-mdev[1] could be built on top as well by resuing the > transport. > > A sample driver is also implemented which simulate a virito-net > loopback ethernet device on top of vringh + workqueue. This could be > used as a reference implementation for real hardware driver. > > Consider mdev framework only support VFIO device and driver right now, > this series also extend it to support other types. This is done > through introducing class id to the device and pairing it with > id_talbe claimed by the driver. On top, this seris also decouple > device specific parents ops out of the common ones. > > Pktgen test was done with virito-net + mvnet loop back device. > > Please review. > > Changes from V1: > > - rename device id to class id > - add docs for class id and device specific ops (device_ops) > - split device_ops into seperate headers > - drop the mdev_set_dma_ops() > - use device_ops to implement the transport API, then it's not a part > of UAPI any more > - use GFP_ATOMIC in mvnet sample device and other tweaks > - set_vring_base/get_vring_base support for mvnet device > > Jason Wang (6): > mdev: class id support > mdev: introduce device specific ops > mdev: introduce virtio device and its device ops > virtio: introudce a mdev based transport > vringh: fix copy direction of vringh_iov_push_kern() > docs: Sample driver to demonstrate how to implement virtio-mdev > framework > > .../driver-api/vfio-mediated-device.rst | 11 +- > drivers/gpu/drm/i915/gvt/kvmgt.c | 17 +- > drivers/s390/cio/vfio_ccw_ops.c | 17 +- > drivers/s390/crypto/vfio_ap_ops.c | 14 +- > drivers/vfio/mdev/Kconfig | 7 + > drivers/vfio/mdev/Makefile | 1 + > drivers/vfio/mdev/mdev_core.c | 21 +- > drivers/vfio/mdev/mdev_driver.c | 14 + > drivers/vfio/mdev/mdev_private.h | 1 + > drivers/vfio/mdev/vfio_mdev.c | 37 +- > drivers/vfio/mdev/virtio_mdev.c | 418 +++++++++++ > drivers/vhost/vringh.c | 8 +- > include/linux/mdev.h | 46 +- > include/linux/mod_devicetable.h | 8 + > include/linux/vfio_mdev.h | 50 ++ > include/linux/virtio_mdev.h | 141 ++++ > samples/Kconfig | 7 + > samples/vfio-mdev/Makefile | 1 + > samples/vfio-mdev/mbochs.c | 19 +- > samples/vfio-mdev/mdpy.c | 19 +- > samples/vfio-mdev/mtty.c | 17 +- > samples/vfio-mdev/mvnet.c | 688 ++++++++++++++++++ > 22 files changed, 1473 insertions(+), 89 deletions(-) > create mode 100644 drivers/vfio/mdev/virtio_mdev.c > create mode 100644 include/linux/vfio_mdev.h > create mode 100644 include/linux/virtio_mdev.h > create mode 100644 samples/vfio-mdev/mvnet.c > > -- > 2.19.1
