struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd)
{
int r;
struct vhost_net *net = qemu_malloc(sizeof *net);
if (!backend) {
fprintf(stderr, "vhost-net requires backend to be setup\n");
goto fail;
}
r = vhost_net_get_fd(backend);
if (r < 0) {
goto fail;
}
net->vc = backend;
net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
(1 << VHOST_NET_F_VIRTIO_NET_HDR);
net->backend = r;
r = vhost_dev_init(&net->dev, devfd);
if (r < 0) {
goto fail;
}
if (~net->dev.features & net->dev.backend_features) {
fprintf(stderr, "vhost lacks feature mask %" PRIu64 " for backend\n",
(uint64_t)(~net->dev.features & net->dev.backend_features));
vhost_dev_cleanup(&net->dev);
goto fail;
}
/* Set sane init value. Override when guest acks. */
vhost_net_ack_features(net, 0);
return net;
fail:
qemu_free(net);
return NULL;
}
struct vhost_net *vhost_net_init(VhostNetOptions *options)
{
int r;
bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
struct vhost_net *net = g_malloc(sizeof *net);
if (!options->net_backend) {
fprintf(stderr, "vhost-net requires net backend to be setup\n");
goto fail;
}
net->nc = options->net_backend;
net->dev.max_queues = 1;
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
if (backend_kernel) {
r = vhost_net_get_fd(options->net_backend);
if (r < 0) {
goto fail;
}
net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
net->backend = r;
net->dev.protocol_features = 0;
} else {
net->dev.backend_features = 0;
net->dev.protocol_features = 0;
net->backend = -1;
/* vhost-user needs vq_index to initiate a specific queue pair */
net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
}
r = vhost_dev_init(&net->dev, options->opaque,
options->backend_type);
if (r < 0) {
goto fail;
}
if (backend_kernel) {
if (!qemu_has_vnet_hdr_len(options->net_backend,
sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
}
if (~net->dev.features & net->dev.backend_features) {
fprintf(stderr, "vhost lacks feature mask %" PRIu64
" for backend\n",
(uint64_t)(~net->dev.features & net->dev.backend_features));
vhost_dev_cleanup(&net->dev);
goto fail;
}
}
/* Set sane init value. Override when guest acks. */
vhost_net_ack_features(net, 0);
return net;
fail:
g_free(net);
return NULL;
}
struct vhost_net *vhost_net_init(NetClientState *backend, int devfd,
bool force)
{
int r;
struct vhost_net *net = g_malloc(sizeof *net);
if (!backend) {
fprintf(stderr, "vhost-net requires backend to be setup\n");
goto fail;
}
r = vhost_net_get_fd(backend);
if (r < 0) {
goto fail;
}
net->nc = backend;
net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
(1 << VHOST_NET_F_VIRTIO_NET_HDR);
net->backend = r;
net->dev.nvqs = 2;
net->dev.vqs = net->vqs;
r = vhost_dev_init(&net->dev, devfd, "/dev/vhost-net", force);
if (r < 0) {
goto fail;
}
if (!tap_has_vnet_hdr_len(backend,
sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
}
if (~net->dev.features & net->dev.backend_features) {
fprintf(stderr, "vhost lacks feature mask %" PRIu64 " for backend\n",
(uint64_t)(~net->dev.features & net->dev.backend_features));
vhost_dev_cleanup(&net->dev);
goto fail;
}
/* Set sane init value. Override when guest acks. */
vhost_net_ack_features(net, 0);
return net;
fail:
g_free(net);
return NULL;
}
