static int vhost_net_start_one(struct vhost_net *net,
VirtIODevice *dev)
{
struct vhost_vring_file file = { };
int r;
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
r = vhost_dev_enable_notifiers(&net->dev, dev);
if (r < 0) {
goto fail_notifiers;
}
r = vhost_dev_start(&net->dev, dev);
if (r < 0) {
goto fail_start;
}
if (net->nc->info->poll) {
net->nc->info->poll(net->nc, false);
}
if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
file.fd = net->backend;
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
r = vhost_net_set_backend(&net->dev, &file);
if (r < 0) {
r = -errno;
goto fail;
}
}
}
return 0;
fail:
file.fd = -1;
if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
while (file.index-- > 0) {
int r = vhost_net_set_backend(&net->dev, &file);
assert(r >= 0);
}
}
if (net->nc->info->poll) {
net->nc->info->poll(net->nc, true);
}
vhost_dev_stop(&net->dev, dev);
fail_start:
vhost_dev_disable_notifiers(&net->dev, dev);
fail_notifiers:
return r;
}
static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
{
struct vhost_net *n = f->private_data;
void __user *argp = (void __user *)arg;
u64 __user *featurep = argp;
struct vhost_vring_file backend;
u64 features;
int r;
switch (ioctl) {
case VHOST_NET_SET_BACKEND:
if (copy_from_user(&backend, argp, sizeof backend))
return -EFAULT;
return vhost_net_set_backend(n, backend.index, backend.fd);
case VHOST_GET_FEATURES:
features = VHOST_FEATURES;
if (copy_to_user(featurep, &features, sizeof features))
return -EFAULT;
return 0;
case VHOST_SET_FEATURES:
if (copy_from_user(&features, featurep, sizeof features))
return -EFAULT;
if (features & ~VHOST_FEATURES)
return -EOPNOTSUPP;
return vhost_net_set_features(n, features);
case VHOST_RESET_OWNER:
return vhost_net_reset_owner(n);
default:
mutex_lock(&n->dev.mutex);
r = vhost_dev_ioctl(&n->dev, ioctl, arg);
vhost_net_flush(n);
mutex_unlock(&n->dev.mutex);
return r;
}
}
static void vhost_net_stop_one(struct vhost_net *net,
VirtIODevice *dev)
{
struct vhost_vring_file file = { .fd = -1 };
if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
int r = vhost_net_set_backend(&net->dev, &file);
assert(r >= 0);
}
}
if (net->nc->info->poll) {
net->nc->info->poll(net->nc, true);
}
vhost_dev_stop(&net->dev, dev);
vhost_dev_disable_notifiers(&net->dev, dev);
}
int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
int total_queues)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
int r, e, i;
if (!k->set_guest_notifiers) {
error_report("binding does not support guest notifiers");
return -ENOSYS;
}
for (i = 0; i < total_queues; i++) {
struct vhost_net *net;
net = get_vhost_net(ncs[i].peer);
vhost_net_set_vq_index(net, i * 2);
/* Suppress the masking guest notifiers on vhost user
* because vhost user doesn't interrupt masking/unmasking
* properly.
*/
if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
dev->use_guest_notifier_mask = false;
}
}
r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
if (r < 0) {
error_report("Error binding guest notifier: %d", -r);
goto err;
}
for (i = 0; i < total_queues; i++) {
r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
if (r < 0) {
goto err_start;
}
if (ncs[i].peer->vring_enable) {
/* restore vring enable state */
r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
if (r < 0) {
goto err_start;
}
}
}
return 0;
err_start:
while (--i >= 0) {
vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
}
e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
if (e < 0) {
fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
fflush(stderr);
}
err:
return r;
}