4 * Copyright Red Hat, Inc. 2010
7 * Michael S. Tsirkin <mst@redhat.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
16 #include "virtio-net.h"
17 #include "vhost_net.h"
18 #include "qemu-error.h"
22 #ifdef CONFIG_VHOST_NET
23 #include <linux/vhost.h>
24 #include <sys/socket.h>
25 #include <linux/kvm.h>
27 #include <sys/ioctl.h>
28 #include <linux/virtio_ring.h>
29 #include <netpacket/packet.h>
30 #include <net/ethernet.h>
32 #include <netinet/in.h>
40 struct vhost_virtqueue vqs[2];
45 unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
47 /* Clear features not supported by host kernel. */
48 if (!(net->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) {
49 features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
51 if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
52 features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
54 if (!(net->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
55 features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
57 if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) {
58 features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
63 void vhost_net_ack_features(struct vhost_net *net, unsigned features)
65 net->dev.acked_features = net->dev.backend_features;
66 if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) {
67 net->dev.acked_features |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
69 if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
70 net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
72 if (features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
73 net->dev.acked_features |= (1 << VIRTIO_RING_F_EVENT_IDX);
75 if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
76 net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
80 static int vhost_net_get_fd(VLANClientState *backend)
82 switch (backend->info->type) {
83 case NET_CLIENT_TYPE_TAP:
84 return tap_get_fd(backend);
86 fprintf(stderr, "vhost-net requires tap backend\n");
91 struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd,
95 struct vhost_net *net = qemu_malloc(sizeof *net);
97 fprintf(stderr, "vhost-net requires backend to be setup\n");
100 r = vhost_net_get_fd(backend);
105 net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
106 (1 << VHOST_NET_F_VIRTIO_NET_HDR);
109 r = vhost_dev_init(&net->dev, devfd, force);
113 if (!tap_has_vnet_hdr_len(backend,
114 sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
115 net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
117 if (~net->dev.features & net->dev.backend_features) {
118 fprintf(stderr, "vhost lacks feature mask %" PRIu64 " for backend\n",
119 (uint64_t)(~net->dev.features & net->dev.backend_features));
120 vhost_dev_cleanup(&net->dev);
124 /* Set sane init value. Override when guest acks. */
125 vhost_net_ack_features(net, 0);
132 bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
134 return vhost_dev_query(&net->dev, dev);
137 int vhost_net_start(struct vhost_net *net,
140 struct vhost_vring_file file = { };
142 if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
143 tap_set_vnet_hdr_len(net->vc,
144 sizeof(struct virtio_net_hdr_mrg_rxbuf));
148 net->dev.vqs = net->vqs;
149 r = vhost_dev_start(&net->dev, dev);
154 net->vc->info->poll(net->vc, false);
155 qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
156 file.fd = net->backend;
157 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
158 r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
167 while (file.index-- > 0) {
168 int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
171 net->vc->info->poll(net->vc, true);
172 vhost_dev_stop(&net->dev, dev);
173 if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
174 tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr));
179 void vhost_net_stop(struct vhost_net *net,
182 struct vhost_vring_file file = { .fd = -1 };
184 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
185 int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
188 net->vc->info->poll(net->vc, true);
189 vhost_dev_stop(&net->dev, dev);
190 if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
191 tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr));
195 void vhost_net_cleanup(struct vhost_net *net)
197 vhost_dev_cleanup(&net->dev);
198 if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) {
199 tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr));
204 struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd,
207 error_report("vhost-net support is not compiled in");
211 bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
216 int vhost_net_start(struct vhost_net *net,
221 void vhost_net_stop(struct vhost_net *net,
226 void vhost_net_cleanup(struct vhost_net *net)
230 unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
234 void vhost_net_ack_features(struct vhost_net *net, unsigned features)