[dpdk-dev] [PATCH v3 0/7] virtio_user as an alternative exception path
Jianfeng Tan
jianfeng.tan at intel.com
Wed Jan 4 04:59:19 CET 2017
v3:
- Drop the patch to postpone driver ok sending patch, superseded it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
necessary).
- features: vhost-net is born to be a networking solution, which has
lots of networking related featuers, like multi queue, tso, multi-seg
mbuf, etc.
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
--
2.7.4
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