[Qemu-devel] [PATCH 0/6 v8] vhost-user multiple queue support

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

Hi,

Here is the updated patch set for enabling vhost-user multiple queue.

This patch set introduces 2 more vhost user messages: VHOST_USER_GET_QUEUE_NUM,
for querying how many queues the backend supports, and VHOST_USER_SET_VRING_ENABLE,
for enabling/disabling a specific virt queue.

Both of the two new messages are treated as vhost protocol extension,
and that's why Michaels's patch "vhost-user: add protocol feature
negotiation" is also included here.

Patch 1-4 are all prepare works for actually enabling multiple queue.

Patch 5 is the major patch for enabling multiple queue, which also tries
to address two major concerns from Michael: no feedback from backend if
it can't support # of requested queues, and all messages are sent N time.
It also fixes a hidden bug.

Patch 6 introduces the VHOST_USER_SET_VRING_ENABLE message, to enable
or disable a specific vring.

Note that I haven't done any formal test yet, it just passes build
test and basic functional test, such as it does exit when backend
doesn't support # of requested queues. Here I sent it out just for
more comments, and for avoiding spending too much effort on the wrong
track.


v8: - set vq_index for vhost-user inside vhost_net_init() based on the
      net->nc->queue_index field. Per Jason Wang suggested, we can't
      move the vhost_net_set_vq_index() ahead to inside of vhost_net_init(),
      as it will break vhost-kernel multiple queue support(with tap).
      And that's why it's one patch less in this version.


    - Rename VHOST_USER_SET_VRING_FLAG to VHOST_USER_SET_VRING_ENABLE.


Thanks.

    --yliu

---
Changchun Ouyang (2):
  vhost-user: add multiple queue support
  vhost-user: add a new message to disable/enable a specific virt queue.

Michael S. Tsirkin (1):
  vhost-user: add protocol feature negotiation

Yuanhan Liu (3):
  vhost-user: use VHOST_USER_XXX macro for switch statement
  vhost: rename VHOST_RESET_OWNER to VHOST_RESET_DEVICE
  vhost-user: add VHOST_USER_GET_QUEUE_NUM message

 docs/specs/vhost-user.txt         |  75 +++++++++++++++++++-
 hw/net/vhost_net.c                |  34 ++++++++-
 hw/net/virtio-net.c               |   8 +++
 hw/virtio/vhost-user.c            | 140 ++++++++++++++++++++++++++++++++------
 include/hw/virtio/vhost-backend.h |   2 +
 include/hw/virtio/vhost.h         |   2 +
 include/net/net.h                 |   1 +
 include/net/vhost_net.h           |   3 +
 linux-headers/linux/vhost.h       |   2 +-
 net/vhost-user.c                  | 140 +++++++++++++++++++++++++++-----------
 qapi-schema.json                  |   6 +-
 qemu-options.hx                   |   5 +-
 tests/vhost-user-test.c           |   2 +-
 13 files changed, 350 insertions(+), 70 deletions(-)

-- 
1.9.0