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vhost-user: add a new message to disable/enable a specific virt queue.

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Add a new message, VHOST_USER_SET_VRING_ENABLE, to enable or disable
a specific virt queue, which is similar to attach/detach queue for
tap device.

virtio driver on guest doesn't have to use max virt queue pair, it
could enable any number of virt queue ranging from 1 to max virt
queue pair.

Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com>
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>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Tested-by: Marcel Apfelbaum <marcel@redhat.com>
This commit is contained in:
Changchun Ouyang 2015-09-23 12:20:01 +08:00 • committed by Michael S. Tsirkin
parent b931bfbf04
commit 7263a0ad78
6 changed files with 60 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

19
hw/virtio/vhost-user.c
View file

@ -48,6 +48,7 @@ typedef enum VhostUserRequest {
VHOST_USER_GET_PROTOCOL_FEATURES = 15,
VHOST_USER_SET_PROTOCOL_FEATURES = 16,
VHOST_USER_GET_QUEUE_NUM = 17,
VHOST_USER_SET_VRING_ENABLE = 18,
VHOST_USER_MAX
} VhostUserRequest;
@ -290,6 +291,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
case VHOST_USER_SET_VRING_NUM:
case VHOST_USER_SET_VRING_BASE:
case VHOST_USER_SET_VRING_ENABLE:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
msg.size = sizeof(m.state);
break;
@ -406,6 +408,22 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque)
return 0;
}
static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable)
{
struct vhost_vring_state state = {
.index = dev->vq_index,
.num = enable,
};
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ))) {
return -1;
}
return vhost_user_call(dev, VHOST_USER_SET_VRING_ENABLE, &state);
}
static int vhost_user_cleanup(struct vhost_dev *dev)
{
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
@ -428,4 +446,5 @@ const VhostOps user_ops = {
.vhost_backend_init = vhost_user_init,
.vhost_backend_cleanup = vhost_user_cleanup,
.vhost_backend_get_vq_index = vhost_user_get_vq_index,
.vhost_backend_set_vring_enable = vhost_user_set_vring_enable,
};