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1 | d5970055 | Michael S. Tsirkin | /*
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2 | d5970055 | Michael S. Tsirkin | * vhost-net support
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3 | d5970055 | Michael S. Tsirkin | *
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4 | d5970055 | Michael S. Tsirkin | * Copyright Red Hat, Inc. 2010
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5 | d5970055 | Michael S. Tsirkin | *
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6 | d5970055 | Michael S. Tsirkin | * Authors:
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7 | d5970055 | Michael S. Tsirkin | * Michael S. Tsirkin <mst@redhat.com>
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8 | d5970055 | Michael S. Tsirkin | *
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9 | d5970055 | Michael S. Tsirkin | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | d5970055 | Michael S. Tsirkin | * the COPYING file in the top-level directory.
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11 | d5970055 | Michael S. Tsirkin | */
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12 | d5970055 | Michael S. Tsirkin | |
13 | d5970055 | Michael S. Tsirkin | #include "net.h" |
14 | d5970055 | Michael S. Tsirkin | #include "net/tap.h" |
15 | d5970055 | Michael S. Tsirkin | |
16 | d5970055 | Michael S. Tsirkin | #include "virtio-net.h" |
17 | d5970055 | Michael S. Tsirkin | #include "vhost_net.h" |
18 | d5970055 | Michael S. Tsirkin | |
19 | d5970055 | Michael S. Tsirkin | #include "config.h" |
20 | d5970055 | Michael S. Tsirkin | |
21 | d5970055 | Michael S. Tsirkin | #ifdef CONFIG_VHOST_NET
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22 | d5970055 | Michael S. Tsirkin | #include <linux/vhost.h> |
23 | d5970055 | Michael S. Tsirkin | #include <sys/socket.h> |
24 | d5970055 | Michael S. Tsirkin | #include <linux/kvm.h> |
25 | d5970055 | Michael S. Tsirkin | #include <fcntl.h> |
26 | d5970055 | Michael S. Tsirkin | #include <sys/ioctl.h> |
27 | d5970055 | Michael S. Tsirkin | #include <linux/virtio_ring.h> |
28 | d5970055 | Michael S. Tsirkin | #include <netpacket/packet.h> |
29 | d5970055 | Michael S. Tsirkin | #include <net/ethernet.h> |
30 | d5970055 | Michael S. Tsirkin | #include <net/if.h> |
31 | d5970055 | Michael S. Tsirkin | #include <netinet/in.h> |
32 | d5970055 | Michael S. Tsirkin | |
33 | d5970055 | Michael S. Tsirkin | #include <stdio.h> |
34 | d5970055 | Michael S. Tsirkin | |
35 | d5970055 | Michael S. Tsirkin | #include "vhost.h" |
36 | d5970055 | Michael S. Tsirkin | |
37 | d5970055 | Michael S. Tsirkin | struct vhost_net {
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38 | d5970055 | Michael S. Tsirkin | struct vhost_dev dev;
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39 | d5970055 | Michael S. Tsirkin | struct vhost_virtqueue vqs[2]; |
40 | d5970055 | Michael S. Tsirkin | int backend;
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41 | d5970055 | Michael S. Tsirkin | VLANClientState *vc; |
42 | d5970055 | Michael S. Tsirkin | }; |
43 | d5970055 | Michael S. Tsirkin | |
44 | d5970055 | Michael S. Tsirkin | unsigned vhost_net_get_features(struct vhost_net *net, unsigned features) |
45 | d5970055 | Michael S. Tsirkin | { |
46 | d5970055 | Michael S. Tsirkin | /* Clear features not supported by host kernel. */
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47 | d5970055 | Michael S. Tsirkin | if (!(net->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) { |
48 | d5970055 | Michael S. Tsirkin | features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY);
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49 | d5970055 | Michael S. Tsirkin | } |
50 | d5970055 | Michael S. Tsirkin | if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) { |
51 | d5970055 | Michael S. Tsirkin | features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
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52 | d5970055 | Michael S. Tsirkin | } |
53 | bcbabae8 | Michael S. Tsirkin | if (!(net->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) { |
54 | bcbabae8 | Michael S. Tsirkin | features &= ~(1 << VIRTIO_RING_F_EVENT_IDX);
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55 | bcbabae8 | Michael S. Tsirkin | } |
56 | ca736c8e | Michael S. Tsirkin | if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) { |
57 | ca736c8e | Michael S. Tsirkin | features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
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58 | ca736c8e | Michael S. Tsirkin | } |
59 | d5970055 | Michael S. Tsirkin | return features;
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60 | d5970055 | Michael S. Tsirkin | } |
61 | d5970055 | Michael S. Tsirkin | |
62 | d5970055 | Michael S. Tsirkin | void vhost_net_ack_features(struct vhost_net *net, unsigned features) |
63 | d5970055 | Michael S. Tsirkin | { |
64 | d5970055 | Michael S. Tsirkin | net->dev.acked_features = net->dev.backend_features; |
65 | d5970055 | Michael S. Tsirkin | if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) { |
66 | d5970055 | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
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67 | d5970055 | Michael S. Tsirkin | } |
68 | d5970055 | Michael S. Tsirkin | if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) { |
69 | d5970055 | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
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70 | d5970055 | Michael S. Tsirkin | } |
71 | bcbabae8 | Michael S. Tsirkin | if (features & (1 << VIRTIO_RING_F_EVENT_IDX)) { |
72 | bcbabae8 | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_RING_F_EVENT_IDX);
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73 | bcbabae8 | Michael S. Tsirkin | } |
74 | ca736c8e | Michael S. Tsirkin | if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
75 | ca736c8e | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
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76 | ca736c8e | Michael S. Tsirkin | } |
77 | d5970055 | Michael S. Tsirkin | } |
78 | d5970055 | Michael S. Tsirkin | |
79 | d5970055 | Michael S. Tsirkin | static int vhost_net_get_fd(VLANClientState *backend) |
80 | d5970055 | Michael S. Tsirkin | { |
81 | d5970055 | Michael S. Tsirkin | switch (backend->info->type) {
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82 | d5970055 | Michael S. Tsirkin | case NET_CLIENT_TYPE_TAP:
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83 | d5970055 | Michael S. Tsirkin | return tap_get_fd(backend);
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84 | d5970055 | Michael S. Tsirkin | default:
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85 | d5970055 | Michael S. Tsirkin | fprintf(stderr, "vhost-net requires tap backend\n");
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86 | d5970055 | Michael S. Tsirkin | return -EBADFD;
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87 | d5970055 | Michael S. Tsirkin | } |
88 | d5970055 | Michael S. Tsirkin | } |
89 | d5970055 | Michael S. Tsirkin | |
90 | 5430a28f | mst@redhat.com | struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd, |
91 | 5430a28f | mst@redhat.com | bool force)
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92 | d5970055 | Michael S. Tsirkin | { |
93 | d5970055 | Michael S. Tsirkin | int r;
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94 | d5970055 | Michael S. Tsirkin | struct vhost_net *net = qemu_malloc(sizeof *net); |
95 | d5970055 | Michael S. Tsirkin | if (!backend) {
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96 | d5970055 | Michael S. Tsirkin | fprintf(stderr, "vhost-net requires backend to be setup\n");
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97 | d5970055 | Michael S. Tsirkin | goto fail;
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98 | d5970055 | Michael S. Tsirkin | } |
99 | d5970055 | Michael S. Tsirkin | r = vhost_net_get_fd(backend); |
100 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
101 | d5970055 | Michael S. Tsirkin | goto fail;
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102 | d5970055 | Michael S. Tsirkin | } |
103 | d5970055 | Michael S. Tsirkin | net->vc = backend; |
104 | d5970055 | Michael S. Tsirkin | net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
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105 | d5970055 | Michael S. Tsirkin | (1 << VHOST_NET_F_VIRTIO_NET_HDR);
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106 | d5970055 | Michael S. Tsirkin | net->backend = r; |
107 | d5970055 | Michael S. Tsirkin | |
108 | 5430a28f | mst@redhat.com | r = vhost_dev_init(&net->dev, devfd, force); |
109 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
110 | d5970055 | Michael S. Tsirkin | goto fail;
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111 | d5970055 | Michael S. Tsirkin | } |
112 | ca736c8e | Michael S. Tsirkin | if (!tap_has_vnet_hdr_len(backend,
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113 | ca736c8e | Michael S. Tsirkin | sizeof(struct virtio_net_hdr_mrg_rxbuf))) { |
114 | ca736c8e | Michael S. Tsirkin | net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
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115 | ca736c8e | Michael S. Tsirkin | } |
116 | d5970055 | Michael S. Tsirkin | if (~net->dev.features & net->dev.backend_features) {
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117 | 0bfcd599 | Blue Swirl | fprintf(stderr, "vhost lacks feature mask %" PRIu64 " for backend\n", |
118 | 29f91781 | Jes Sorensen | (uint64_t)(~net->dev.features & net->dev.backend_features)); |
119 | d5970055 | Michael S. Tsirkin | vhost_dev_cleanup(&net->dev); |
120 | d5970055 | Michael S. Tsirkin | goto fail;
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121 | d5970055 | Michael S. Tsirkin | } |
122 | d5970055 | Michael S. Tsirkin | |
123 | d5970055 | Michael S. Tsirkin | /* Set sane init value. Override when guest acks. */
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124 | d5970055 | Michael S. Tsirkin | vhost_net_ack_features(net, 0);
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125 | d5970055 | Michael S. Tsirkin | return net;
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126 | d5970055 | Michael S. Tsirkin | fail:
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127 | d5970055 | Michael S. Tsirkin | qemu_free(net); |
128 | d5970055 | Michael S. Tsirkin | return NULL; |
129 | d5970055 | Michael S. Tsirkin | } |
130 | d5970055 | Michael S. Tsirkin | |
131 | 5430a28f | mst@redhat.com | bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
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132 | 5430a28f | mst@redhat.com | { |
133 | 5430a28f | mst@redhat.com | return vhost_dev_query(&net->dev, dev);
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134 | 5430a28f | mst@redhat.com | } |
135 | 5430a28f | mst@redhat.com | |
136 | d5970055 | Michael S. Tsirkin | int vhost_net_start(struct vhost_net *net, |
137 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
138 | d5970055 | Michael S. Tsirkin | { |
139 | d5970055 | Michael S. Tsirkin | struct vhost_vring_file file = { };
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140 | d5970055 | Michael S. Tsirkin | int r;
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141 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
142 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, |
143 | ca736c8e | Michael S. Tsirkin | sizeof(struct virtio_net_hdr_mrg_rxbuf)); |
144 | ca736c8e | Michael S. Tsirkin | } |
145 | d5970055 | Michael S. Tsirkin | |
146 | d5970055 | Michael S. Tsirkin | net->dev.nvqs = 2;
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147 | d5970055 | Michael S. Tsirkin | net->dev.vqs = net->vqs; |
148 | d5970055 | Michael S. Tsirkin | r = vhost_dev_start(&net->dev, dev); |
149 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
150 | d5970055 | Michael S. Tsirkin | return r;
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151 | d5970055 | Michael S. Tsirkin | } |
152 | d5970055 | Michael S. Tsirkin | |
153 | d5970055 | Michael S. Tsirkin | net->vc->info->poll(net->vc, false);
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154 | d5970055 | Michael S. Tsirkin | qemu_set_fd_handler(net->backend, NULL, NULL, NULL); |
155 | d5970055 | Michael S. Tsirkin | file.fd = net->backend; |
156 | d5970055 | Michael S. Tsirkin | for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { |
157 | d5970055 | Michael S. Tsirkin | r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file); |
158 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
159 | d5970055 | Michael S. Tsirkin | r = -errno; |
160 | d5970055 | Michael S. Tsirkin | goto fail;
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161 | d5970055 | Michael S. Tsirkin | } |
162 | d5970055 | Michael S. Tsirkin | } |
163 | d5970055 | Michael S. Tsirkin | return 0; |
164 | d5970055 | Michael S. Tsirkin | fail:
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165 | d5970055 | Michael S. Tsirkin | file.fd = -1;
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166 | 6b37c87c | Michael S. Tsirkin | while (file.index-- > 0) { |
167 | d5970055 | Michael S. Tsirkin | int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
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168 | d5970055 | Michael S. Tsirkin | assert(r >= 0);
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169 | d5970055 | Michael S. Tsirkin | } |
170 | d5970055 | Michael S. Tsirkin | net->vc->info->poll(net->vc, true);
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171 | d5970055 | Michael S. Tsirkin | vhost_dev_stop(&net->dev, dev); |
172 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
173 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr)); |
174 | ca736c8e | Michael S. Tsirkin | } |
175 | d5970055 | Michael S. Tsirkin | return r;
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176 | d5970055 | Michael S. Tsirkin | } |
177 | d5970055 | Michael S. Tsirkin | |
178 | d5970055 | Michael S. Tsirkin | void vhost_net_stop(struct vhost_net *net, |
179 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
180 | d5970055 | Michael S. Tsirkin | { |
181 | d5970055 | Michael S. Tsirkin | struct vhost_vring_file file = { .fd = -1 }; |
182 | d5970055 | Michael S. Tsirkin | |
183 | d5970055 | Michael S. Tsirkin | for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { |
184 | d5970055 | Michael S. Tsirkin | int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
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185 | d5970055 | Michael S. Tsirkin | assert(r >= 0);
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186 | d5970055 | Michael S. Tsirkin | } |
187 | d5970055 | Michael S. Tsirkin | net->vc->info->poll(net->vc, true);
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188 | d5970055 | Michael S. Tsirkin | vhost_dev_stop(&net->dev, dev); |
189 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
190 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr)); |
191 | ca736c8e | Michael S. Tsirkin | } |
192 | d5970055 | Michael S. Tsirkin | } |
193 | d5970055 | Michael S. Tsirkin | |
194 | d5970055 | Michael S. Tsirkin | void vhost_net_cleanup(struct vhost_net *net) |
195 | d5970055 | Michael S. Tsirkin | { |
196 | d5970055 | Michael S. Tsirkin | vhost_dev_cleanup(&net->dev); |
197 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
198 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr)); |
199 | ca736c8e | Michael S. Tsirkin | } |
200 | d5970055 | Michael S. Tsirkin | qemu_free(net); |
201 | d5970055 | Michael S. Tsirkin | } |
202 | d5970055 | Michael S. Tsirkin | #else
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203 | 5430a28f | mst@redhat.com | struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd, |
204 | 5430a28f | mst@redhat.com | bool force)
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205 | 5430a28f | mst@redhat.com | { |
206 | 5430a28f | mst@redhat.com | return NULL; |
207 | 5430a28f | mst@redhat.com | } |
208 | 5430a28f | mst@redhat.com | |
209 | 5430a28f | mst@redhat.com | bool vhost_net_query(VHostNetState *net, VirtIODevice *dev)
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210 | d5970055 | Michael S. Tsirkin | { |
211 | 5430a28f | mst@redhat.com | return false; |
212 | d5970055 | Michael S. Tsirkin | } |
213 | d5970055 | Michael S. Tsirkin | |
214 | d5970055 | Michael S. Tsirkin | int vhost_net_start(struct vhost_net *net, |
215 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
216 | d5970055 | Michael S. Tsirkin | { |
217 | 5430a28f | mst@redhat.com | return -ENOSYS;
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218 | d5970055 | Michael S. Tsirkin | } |
219 | d5970055 | Michael S. Tsirkin | void vhost_net_stop(struct vhost_net *net, |
220 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
221 | d5970055 | Michael S. Tsirkin | { |
222 | d5970055 | Michael S. Tsirkin | } |
223 | d5970055 | Michael S. Tsirkin | |
224 | d5970055 | Michael S. Tsirkin | void vhost_net_cleanup(struct vhost_net *net) |
225 | d5970055 | Michael S. Tsirkin | { |
226 | d5970055 | Michael S. Tsirkin | } |
227 | d5970055 | Michael S. Tsirkin | |
228 | d5970055 | Michael S. Tsirkin | unsigned vhost_net_get_features(struct vhost_net *net, unsigned features) |
229 | d5970055 | Michael S. Tsirkin | { |
230 | 5430a28f | mst@redhat.com | return features;
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231 | d5970055 | Michael S. Tsirkin | } |
232 | d5970055 | Michael S. Tsirkin | void vhost_net_ack_features(struct vhost_net *net, unsigned features) |
233 | d5970055 | Michael S. Tsirkin | { |
234 | d5970055 | Michael S. Tsirkin | } |
235 | d5970055 | Michael S. Tsirkin | #endif |