[dpdk-dev] [PATCH v3 0/7] virtio_user as an alternative exception path
jianfeng.tan at intel.com
Wed Jan 4 04:59:19 CET 2017
- Drop the patch to postpone driver ok sending patch, superseded it
with a bug fix to disable all virtqueues and re-init the device.
(you might wonder why not just send reset owner msg. Under my test,
it causes spinlock deadlock problem when killing the program).
- Avoid compiling error on 32-bit system for pointer convert.
- Fix a bug in patch "abstract virtio user backend ops", vhostfd is
not properly assigned.
- Fix a "MQ cannot be used" bug in v2, which is related to strip
some feature bits that vhost kernel does not recognize.
- Update release note.
v2: (Lots of them are from yuanhan's comment)
- Add offloding feature.
- Add multiqueue support.
- Add a new patch to postpone the sending of driver ok notification.
- Put fix patch ahead of the whole patch series.
- Split original 0001 patch into 0003 and 0004 patches.
- Remove the original vhost_internal design, just add those into
struct virtio_user_dev for simplicity.
- Reword "control" to "send_request".
- Reword "host_features" to "device_features".
In v16.07, we upstreamed a virtual device, virtio_user (with vhost-user
as the backend). The path to go with a vhost-kernel backend has been
dropped for bad performance comparing to vhost-user and code simplicity.
But after a second thought, virtio_user + vhost-kernel is a good
candidate as an exceptional path, such as KNI, which exchanges packets
with kernel networking stack.
- maintenance: vhost-net (kernel) is upstreamed and extensively used
kernel module. We don't need any out-of-tree module like KNI.
- performance: as with KNI, this solution would use one or more
kthreads to send/receive packets from user space DPDK applications,
which has little impact on user space polling thread (except that
it might enter into kernel space to wake up those kthreads if
- features: vhost-net is born to be a networking solution, which has
lots of networking related featuers, like multi queue, tso, multi-seg
Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
Jianfeng Tan (7):
net/virtio_user: fix wrongly set features
net/virtio_user: fix not properly reset device
net/virtio_user: move vhost user specific code
net/virtio_user: abstract virtio user backend ops
net/virtio_user: add vhost kernel support
net/virtio_user: enable offloading
net/virtio_user: enable multiqueue with vhost kernel
doc/guides/rel_notes/release_17_02.rst | 20 +
drivers/net/virtio/Makefile | 1 +
drivers/net/virtio/virtio_user/vhost.h | 51 +--
drivers/net/virtio/virtio_user/vhost_kernel.c | 487 +++++++++++++++++++++++
drivers/net/virtio/virtio_user/vhost_user.c | 97 +++--
drivers/net/virtio/virtio_user/virtio_user_dev.c | 138 ++++---
drivers/net/virtio/virtio_user/virtio_user_dev.h | 16 +-
drivers/net/virtio/virtio_user_ethdev.c | 19 +-
8 files changed, 705 insertions(+), 124 deletions(-)
create mode 100644 drivers/net/virtio/virtio_user/vhost_kernel.c
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