> From: Jason Wang [mailto:jasowang@xxxxxxxxxx] > Sent: Tuesday, September 24, 2019 9:53 PM > > 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. > > Though the series only contains 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 id_table claimed ... this series ... > device specific parents ops out of the common ones. > > Pktgen test was done with virito-net + mvnet loop back device. > > Please review. > > [1] https://lkml.org/lkml/2019/9/16/869 > > Changes from V1: > > - move virtio_mdev.c to drivers/virtio > - store class_id in mdev_device instead of mdev_parent > - store device_ops in mdev_device instead of mdev_parent > - reorder the patch, vringh fix comes first > - really silent compiling warnings > - really switch to use u16 for class_id > - uevent and modpost support for mdev class_id > - vraious tweaks per comments from Parav > > Changes from RFC-V2: > > - silent compile warnings on some specific configuration > - use u16 instead u8 for class id > - reseve MDEV_ID_VHOST for future vhost-mdev work > - introduce "virtio" type for mvnet and make "vhost" type for future > work > - add entries in MAINTAINER > - tweak and typos fixes in commit log > > Changes from RFC-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 (8): > vringh: fix copy direction of vringh_iov_push_kern() > mdev: class id support > mdev: bus uevent support > modpost: add support for mdev class id > mdev: introduce device specific ops > mdev: introduce virtio device and its device ops > virtio: introduce a mdev based transport > docs: sample driver to demonstrate how to implement virtio-mdev > framework > > .../driver-api/vfio-mediated-device.rst | 7 +- > MAINTAINERS | 2 + > drivers/gpu/drm/i915/gvt/kvmgt.c | 18 +- > drivers/s390/cio/vfio_ccw_ops.c | 18 +- > drivers/s390/crypto/vfio_ap_ops.c | 14 +- > drivers/vfio/mdev/mdev_core.c | 19 + > drivers/vfio/mdev/mdev_driver.c | 22 + > drivers/vfio/mdev/mdev_private.h | 2 + > drivers/vfio/mdev/vfio_mdev.c | 45 +- > drivers/vhost/vringh.c | 8 +- > drivers/virtio/Kconfig | 7 + > drivers/virtio/Makefile | 1 + > drivers/virtio/virtio_mdev.c | 417 +++++++++++ > include/linux/mdev.h | 52 +- > include/linux/mod_devicetable.h | 8 + > include/linux/vfio_mdev.h | 52 ++ > include/linux/virtio_mdev.h | 145 ++++ > samples/Kconfig | 7 + > samples/vfio-mdev/Makefile | 1 + > samples/vfio-mdev/mbochs.c | 20 +- > samples/vfio-mdev/mdpy.c | 20 +- > samples/vfio-mdev/mtty.c | 18 +- > samples/vfio-mdev/mvnet.c | 692 ++++++++++++++++++ > scripts/mod/devicetable-offsets.c | 3 + > scripts/mod/file2alias.c | 10 + > 25 files changed, 1524 insertions(+), 84 deletions(-) > create mode 100644 drivers/virtio/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
