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vhost: add new ready status flag

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This patch adds a new status flag indicating the Virtio device
is ready to operate.

This is required to be able to call rte_vhost_mtu_get() in the
.new_device() callback, as rte_vhost_mtu_get needs that the
negotiation is done, but it is too early to rely on running status
flag, which is set just after .new_device() returns.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
This commit is contained in:
Maxime Coquelin 2017-03-12 17:34:00 +01:00 committed by Yuanhan Liu
parent 23f1e756ca
commit 4c5d8459d2
2 changed files with 15 additions and 7 deletions
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2
lib/librte_vhost/vhost.h
View File

@ -46,6 +46,8 @@
/* Used to indicate that the device is running on a data core */
#define VIRTIO_DEV_RUNNING 1
/* Used to indicate that the device is ready to operate */
#define VIRTIO_DEV_READY 2
/* Backend value set by guest. */
#define VIRTIO_DEV_STOPPED -1

20
lib/librte_vhost/vhost_user.c
View File

@ -678,14 +678,18 @@ vhost_user_set_vring_kick(struct virtio_net *dev, struct VhostUserMsg *pmsg)
close(vq->kickfd);
vq->kickfd = file.fd;
if (virtio_is_ready(dev) && !(dev->flags & VIRTIO_DEV_RUNNING)) {
if (dev->dequeue_zero_copy) {
RTE_LOG(INFO, VHOST_CONFIG,
"dequeue zero copy is enabled\n");
}
if (virtio_is_ready(dev)) {
dev->flags |= VIRTIO_DEV_READY;
if (notify_ops->new_device(dev->vid) == 0)
dev->flags |= VIRTIO_DEV_RUNNING;
if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
if (dev->dequeue_zero_copy) {
RTE_LOG(INFO, VHOST_CONFIG,
"dequeue zero copy is enabled\n");
}
if (notify_ops->new_device(dev->vid) == 0)
dev->flags |= VIRTIO_DEV_RUNNING;
}
}
}
@ -720,6 +724,8 @@ vhost_user_get_vring_base(struct virtio_net *dev,
notify_ops->destroy_device(dev->vid);
}
dev->flags &= ~VIRTIO_DEV_READY;
/* Here we are safe to get the last used index */
state->num = vq->last_used_idx;