[PATCH 0/2] Send all the SVQ control commands in parallel

[Hawkins Jiawei]

This patchset allows QEMU to poll and check the device used buffer
after sending all SVQ control commands, instead of polling and checking
immediately after sending each SVQ control command, so that QEMU can
send all the SVQ control commands in parallel, which have better
performance improvement.

I use vdpa_sim_net to simulate vdpa device, refactor
vhost_vdpa_net_load() to call vhost_vdpa_net_load_mac() 30 times,
refactor `net_vhost_vdpa_cvq_info.load` to call vhost_vdpa_net_load()
1000 times, to build a test environment for sending
multiple SVQ control commands. Time in monotonic to
finish `net_vhost_vdpa_cvq_info.load`:

    QEMU                            monotonic time
--------------------------------------------------
not patched                              89202
--------------------------------------------------
patched                                  80455

This patchset resolves the GitLab issue at
https://gitlab.com/qemu-project/qemu/-/issues/1578.

Hawkins Jiawei (2):
  vdpa: rename vhost_vdpa_net_cvq_add()
  vdpa: send CVQ state load commands in parallel

 net/vhost-vdpa.c | 150 +++++++++++++++++++++++++++++++++++------------
 1 file changed, 112 insertions(+), 38 deletions(-)

-- 
2.25.1