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vhost-net: control virtqueue support 

We assume there's no cvq in the past, this is not true when we need
control virtqueue support for vhost-user backends. So this patch
implements the control virtqueue support for vhost-net. As datapath,
the control virtqueue is also required to be coupled with the
NetClientState. The vhost_net_start/stop() are tweaked to accept the
number of datapath queue pairs plus the the number of control
virtqueue for us to start and stop the vhost device.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20211020045600.16082-7-jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2021-10-20 12:55:56 +08:00 committed by Michael S. Tsirkin
parent 2f849dbdb2
commit 05ba3f63d1
4 changed files with 40 additions and 17 deletions
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4
hw/net/vhost_net-stub.c
View File

@ -33,13 +33,13 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
int vhost_net_start(VirtIODevice *dev,
NetClientState *ncs,
int total_queues)
int data_queue_pairs, int cvq)
{
return -ENOSYS;
}
void vhost_net_stop(VirtIODevice *dev,
NetClientState *ncs,
int total_queues)
int data_queue_pairs, int cvq)
{
}

43
hw/net/vhost_net.c
View File

@ -315,11 +315,14 @@ static void vhost_net_stop_one(struct vhost_net *net,
}
int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
int total_queues)
int data_queue_pairs, int cvq)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
int total_notifiers = data_queue_pairs * 2 + cvq;
VirtIONet *n = VIRTIO_NET(dev);
int nvhosts = data_queue_pairs + cvq;
struct vhost_net *net;
int r, e, i;
NetClientState *peer;
@ -329,9 +332,14 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
return -ENOSYS;
}
for (i = 0; i < total_queues; i++) {
for (i = 0; i < nvhosts; i++) {
if (i < data_queue_pairs) {
peer = qemu_get_peer(ncs, i);
} else { /* Control Virtqueue */
peer = qemu_get_peer(ncs, n->max_queues);
}
peer = qemu_get_peer(ncs, i);
net = get_vhost_net(peer);
vhost_net_set_vq_index(net, i * 2);
@ -344,14 +352,18 @@ int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
}
}
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
r = k->set_guest_notifiers(qbus->parent, total_notifiers, true);
if (r < 0) {
error_report("Error binding guest notifier: %d", -r);
goto err;
}
for (i = 0; i < total_queues; i++) {
peer = qemu_get_peer(ncs, i);
for (i = 0; i < nvhosts; i++) {
if (i < data_queue_pairs) {
peer = qemu_get_peer(ncs, i);
} else {
peer = qemu_get_peer(ncs, n->max_queues);
}
r = vhost_net_start_one(get_vhost_net(peer), dev);
if (r < 0) {
@ -375,7 +387,7 @@ err_start:
peer = qemu_get_peer(ncs , i);
vhost_net_stop_one(get_vhost_net(peer), dev);
}
e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
e = k->set_guest_notifiers(qbus->parent, total_notifiers, false);
if (e < 0) {
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
fflush(stderr);
@ -385,18 +397,27 @@ err:
}
void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
int total_queues)
int data_queue_pairs, int cvq)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
VirtIONet *n = VIRTIO_NET(dev);
NetClientState *peer;
int total_notifiers = data_queue_pairs * 2 + cvq;
int nvhosts = data_queue_pairs + cvq;
int i, r;
for (i = 0; i < total_queues; i++) {
vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
for (i = 0; i < nvhosts; i++) {
if (i < data_queue_pairs) {
peer = qemu_get_peer(ncs, i);
} else {
peer = qemu_get_peer(ncs, n->max_queues);
}
vhost_net_stop_one(get_vhost_net(peer), dev);
}
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
r = k->set_guest_notifiers(qbus->parent, total_notifiers, false);
if (r < 0) {
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
fflush(stderr);

4
hw/net/virtio-net.c
View File

@ -285,14 +285,14 @@ static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
}
n->vhost_started = 1;
r = vhost_net_start(vdev, n->nic->ncs, queues);
r = vhost_net_start(vdev, n->nic->ncs, queues, 0);
if (r < 0) {
error_report("unable to start vhost net: %d: "
"falling back on userspace virtio", -r);
n->vhost_started = 0;
}
} else {
vhost_net_stop(vdev, n->nic->ncs, queues);
vhost_net_stop(vdev, n->nic->ncs, queues, 0);
n->vhost_started = 0;
}
}

6
include/net/vhost_net.h
View File

@ -21,8 +21,10 @@ typedef struct VhostNetOptions {
uint64_t vhost_net_get_max_queues(VHostNetState *net);
struct vhost_net *vhost_net_init(VhostNetOptions *options);
int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, int total_queues);
void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs, int total_queues);
int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
int data_queue_pairs, int cvq);
void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
int data_queue_pairs, int cvq);
void vhost_net_cleanup(VHostNetState *net);