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vhost-user: add VHOST_USER_GET_QUEUE_NUM message

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This is for querying how many queues the backend supports if it has mq
support(when VHOST_USER_PROTOCOL_F_MQ flag is set from the quried
protocol features).

vhost_net_get_max_queues() is the interface to export that value, and
to tell if the backend supports # of queues user requested, which is
done in the following patch.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Tested-by: Marcel Apfelbaum <marcel@redhat.com>
This commit is contained in:
Yuanhan Liu 2015-09-23 12:19:58 +08:00 • committed by Michael S. Tsirkin
parent d1f8b30ec8
commit e2051e9e00
5 changed files with 39 additions and 1 deletions
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11
docs/specs/vhost-user.txt
View file

@ -301,3 +301,14 @@ Message types
Bits (0-7) of the payload contain the vring index. Bit 8 is the
invalid FD flag. This flag is set when there is no file descriptor
in the ancillary data.
* VHOST_USER_GET_QUEUE_NUM
Id: 17
Equivalent ioctl: N/A
Master payload: N/A
Slave payload: u64
Query how many queues the backend supports. This request should be
sent only when VHOST_USER_PROTOCOL_F_MQ is set in quried protocol
features by VHOST_USER_GET_PROTOCOL_FEATURES.