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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
Download patch file Download diff file Expand all files Collapse all files

12
hw/net/vhost_net.c
View file

@ -122,6 +122,11 @@ void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
}
uint64_t vhost_net_get_max_queues(VHostNetState *net)
{
return net->dev.max_queues;
}
static int vhost_net_get_fd(NetClientState *backend)
{
switch (backend->info->type) {
@ -144,6 +149,8 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
goto fail;
}
net->dev.max_queues = 1;
if (backend_kernel) {
r = vhost_net_get_fd(options->net_backend);
if (r < 0) {
@ -414,6 +421,11 @@ VHostNetState *get_vhost_net(NetClientState *nc)
return vhost_net;
}
#else
uint64_t vhost_net_get_max_queues(VHostNetState *net)
{
return 1;
}
struct vhost_net *vhost_net_init(VhostNetOptions *options)
{
error_report("vhost-net support is not compiled in");