vdpa/mlx5: Allow CVQ size changes

The MLX driver was not updating its control virtqueue size at set_vq_num
and instead always initialized to MLX5_CVQ_MAX_ENT (16) at
setup_cvq_vring.

Qemu would try to set the size to 64 by default, however, because the
CVQ size always was initialized to 16, an error would be thrown when
sending >16 control messages (as used-ring entry 17 is initialized to 0).
For example, starting a guest with x-svq=on and then executing the
following command would produce the error below:

 # for i in {1..20}; do ifconfig eth0 hw ether XX:xx:XX:xx:XX:XX; done

 qemu-system-x86_64: Insufficient written data (0)
 [  435.331223] virtio_net virtio0: Failed to set mac address by vq command.
 SIOCSIFHWADDR: Invalid argument

Acked-by: Dragos Tatulea <[email protected]>
Acked-by: Eugenio Pérez <[email protected]>
Signed-off-by: Jonah Palmer <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Tested-by: Lei Yang <[email protected]>
Fixes: 5262912ef3cf ("vdpa/mlx5: Add support for control VQ and MAC setting")

0 files changed, 0 insertions, 0 deletions