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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 | ca736c8e | Michael S. Tsirkin | if (!(net->dev.features & (1 << VIRTIO_NET_F_MRG_RXBUF))) { |
54 | ca736c8e | Michael S. Tsirkin | features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
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55 | ca736c8e | Michael S. Tsirkin | } |
56 | d5970055 | Michael S. Tsirkin | return features;
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57 | d5970055 | Michael S. Tsirkin | } |
58 | d5970055 | Michael S. Tsirkin | |
59 | d5970055 | Michael S. Tsirkin | void vhost_net_ack_features(struct vhost_net *net, unsigned features) |
60 | d5970055 | Michael S. Tsirkin | { |
61 | d5970055 | Michael S. Tsirkin | net->dev.acked_features = net->dev.backend_features; |
62 | d5970055 | Michael S. Tsirkin | if (features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) { |
63 | d5970055 | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
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64 | d5970055 | Michael S. Tsirkin | } |
65 | d5970055 | Michael S. Tsirkin | if (features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) { |
66 | d5970055 | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
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67 | d5970055 | Michael S. Tsirkin | } |
68 | ca736c8e | Michael S. Tsirkin | if (features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
69 | ca736c8e | Michael S. Tsirkin | net->dev.acked_features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
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70 | ca736c8e | Michael S. Tsirkin | } |
71 | d5970055 | Michael S. Tsirkin | } |
72 | d5970055 | Michael S. Tsirkin | |
73 | d5970055 | Michael S. Tsirkin | static int vhost_net_get_fd(VLANClientState *backend) |
74 | d5970055 | Michael S. Tsirkin | { |
75 | d5970055 | Michael S. Tsirkin | switch (backend->info->type) {
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76 | d5970055 | Michael S. Tsirkin | case NET_CLIENT_TYPE_TAP:
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77 | d5970055 | Michael S. Tsirkin | return tap_get_fd(backend);
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78 | d5970055 | Michael S. Tsirkin | default:
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79 | d5970055 | Michael S. Tsirkin | fprintf(stderr, "vhost-net requires tap backend\n");
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80 | d5970055 | Michael S. Tsirkin | return -EBADFD;
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81 | d5970055 | Michael S. Tsirkin | } |
82 | d5970055 | Michael S. Tsirkin | } |
83 | d5970055 | Michael S. Tsirkin | |
84 | d5970055 | Michael S. Tsirkin | struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd) |
85 | d5970055 | Michael S. Tsirkin | { |
86 | d5970055 | Michael S. Tsirkin | int r;
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87 | d5970055 | Michael S. Tsirkin | struct vhost_net *net = qemu_malloc(sizeof *net); |
88 | d5970055 | Michael S. Tsirkin | if (!backend) {
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89 | d5970055 | Michael S. Tsirkin | fprintf(stderr, "vhost-net requires backend to be setup\n");
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90 | d5970055 | Michael S. Tsirkin | goto fail;
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91 | d5970055 | Michael S. Tsirkin | } |
92 | d5970055 | Michael S. Tsirkin | r = vhost_net_get_fd(backend); |
93 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
94 | d5970055 | Michael S. Tsirkin | goto fail;
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95 | d5970055 | Michael S. Tsirkin | } |
96 | d5970055 | Michael S. Tsirkin | net->vc = backend; |
97 | d5970055 | Michael S. Tsirkin | net->dev.backend_features = tap_has_vnet_hdr(backend) ? 0 :
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98 | d5970055 | Michael S. Tsirkin | (1 << VHOST_NET_F_VIRTIO_NET_HDR);
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99 | d5970055 | Michael S. Tsirkin | net->backend = r; |
100 | d5970055 | Michael S. Tsirkin | |
101 | d5970055 | Michael S. Tsirkin | r = vhost_dev_init(&net->dev, devfd); |
102 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
103 | d5970055 | Michael S. Tsirkin | goto fail;
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104 | d5970055 | Michael S. Tsirkin | } |
105 | ca736c8e | Michael S. Tsirkin | if (!tap_has_vnet_hdr_len(backend,
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106 | ca736c8e | Michael S. Tsirkin | sizeof(struct virtio_net_hdr_mrg_rxbuf))) { |
107 | ca736c8e | Michael S. Tsirkin | net->dev.features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
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108 | ca736c8e | Michael S. Tsirkin | } |
109 | d5970055 | Michael S. Tsirkin | if (~net->dev.features & net->dev.backend_features) {
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110 | 0bfcd599 | Blue Swirl | fprintf(stderr, "vhost lacks feature mask %" PRIu64 " for backend\n", |
111 | 29f91781 | Jes Sorensen | (uint64_t)(~net->dev.features & net->dev.backend_features)); |
112 | d5970055 | Michael S. Tsirkin | vhost_dev_cleanup(&net->dev); |
113 | d5970055 | Michael S. Tsirkin | goto fail;
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114 | d5970055 | Michael S. Tsirkin | } |
115 | d5970055 | Michael S. Tsirkin | |
116 | d5970055 | Michael S. Tsirkin | /* Set sane init value. Override when guest acks. */
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117 | d5970055 | Michael S. Tsirkin | vhost_net_ack_features(net, 0);
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118 | d5970055 | Michael S. Tsirkin | return net;
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119 | d5970055 | Michael S. Tsirkin | fail:
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120 | d5970055 | Michael S. Tsirkin | qemu_free(net); |
121 | d5970055 | Michael S. Tsirkin | return NULL; |
122 | d5970055 | Michael S. Tsirkin | } |
123 | d5970055 | Michael S. Tsirkin | |
124 | d5970055 | Michael S. Tsirkin | int vhost_net_start(struct vhost_net *net, |
125 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
126 | d5970055 | Michael S. Tsirkin | { |
127 | d5970055 | Michael S. Tsirkin | struct vhost_vring_file file = { };
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128 | d5970055 | Michael S. Tsirkin | int r;
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129 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
130 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, |
131 | ca736c8e | Michael S. Tsirkin | sizeof(struct virtio_net_hdr_mrg_rxbuf)); |
132 | ca736c8e | Michael S. Tsirkin | } |
133 | d5970055 | Michael S. Tsirkin | |
134 | d5970055 | Michael S. Tsirkin | net->dev.nvqs = 2;
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135 | d5970055 | Michael S. Tsirkin | net->dev.vqs = net->vqs; |
136 | d5970055 | Michael S. Tsirkin | r = vhost_dev_start(&net->dev, dev); |
137 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
138 | d5970055 | Michael S. Tsirkin | return r;
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139 | d5970055 | Michael S. Tsirkin | } |
140 | d5970055 | Michael S. Tsirkin | |
141 | d5970055 | Michael S. Tsirkin | net->vc->info->poll(net->vc, false);
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142 | d5970055 | Michael S. Tsirkin | qemu_set_fd_handler(net->backend, NULL, NULL, NULL); |
143 | d5970055 | Michael S. Tsirkin | file.fd = net->backend; |
144 | d5970055 | Michael S. Tsirkin | for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { |
145 | d5970055 | Michael S. Tsirkin | r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file); |
146 | d5970055 | Michael S. Tsirkin | if (r < 0) { |
147 | d5970055 | Michael S. Tsirkin | r = -errno; |
148 | d5970055 | Michael S. Tsirkin | goto fail;
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149 | d5970055 | Michael S. Tsirkin | } |
150 | d5970055 | Michael S. Tsirkin | } |
151 | d5970055 | Michael S. Tsirkin | return 0; |
152 | d5970055 | Michael S. Tsirkin | fail:
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153 | d5970055 | Michael S. Tsirkin | file.fd = -1;
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154 | 6b37c87c | Michael S. Tsirkin | while (file.index-- > 0) { |
155 | d5970055 | Michael S. Tsirkin | int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
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156 | d5970055 | Michael S. Tsirkin | assert(r >= 0);
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157 | d5970055 | Michael S. Tsirkin | } |
158 | d5970055 | Michael S. Tsirkin | net->vc->info->poll(net->vc, true);
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159 | d5970055 | Michael S. Tsirkin | vhost_dev_stop(&net->dev, dev); |
160 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
161 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr)); |
162 | ca736c8e | Michael S. Tsirkin | } |
163 | d5970055 | Michael S. Tsirkin | return r;
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164 | d5970055 | Michael S. Tsirkin | } |
165 | d5970055 | Michael S. Tsirkin | |
166 | d5970055 | Michael S. Tsirkin | void vhost_net_stop(struct vhost_net *net, |
167 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
168 | d5970055 | Michael S. Tsirkin | { |
169 | d5970055 | Michael S. Tsirkin | struct vhost_vring_file file = { .fd = -1 }; |
170 | d5970055 | Michael S. Tsirkin | |
171 | d5970055 | Michael S. Tsirkin | for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { |
172 | d5970055 | Michael S. Tsirkin | int r = ioctl(net->dev.control, VHOST_NET_SET_BACKEND, &file);
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173 | d5970055 | Michael S. Tsirkin | assert(r >= 0);
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174 | d5970055 | Michael S. Tsirkin | } |
175 | d5970055 | Michael S. Tsirkin | net->vc->info->poll(net->vc, true);
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176 | d5970055 | Michael S. Tsirkin | vhost_dev_stop(&net->dev, dev); |
177 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
178 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr)); |
179 | ca736c8e | Michael S. Tsirkin | } |
180 | d5970055 | Michael S. Tsirkin | } |
181 | d5970055 | Michael S. Tsirkin | |
182 | d5970055 | Michael S. Tsirkin | void vhost_net_cleanup(struct vhost_net *net) |
183 | d5970055 | Michael S. Tsirkin | { |
184 | d5970055 | Michael S. Tsirkin | vhost_dev_cleanup(&net->dev); |
185 | ca736c8e | Michael S. Tsirkin | if (net->dev.acked_features & (1 << VIRTIO_NET_F_MRG_RXBUF)) { |
186 | ca736c8e | Michael S. Tsirkin | tap_set_vnet_hdr_len(net->vc, sizeof(struct virtio_net_hdr)); |
187 | ca736c8e | Michael S. Tsirkin | } |
188 | d5970055 | Michael S. Tsirkin | qemu_free(net); |
189 | d5970055 | Michael S. Tsirkin | } |
190 | d5970055 | Michael S. Tsirkin | #else
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191 | d5970055 | Michael S. Tsirkin | struct vhost_net *vhost_net_init(VLANClientState *backend, int devfd) |
192 | d5970055 | Michael S. Tsirkin | { |
193 | d5970055 | Michael S. Tsirkin | return NULL; |
194 | d5970055 | Michael S. Tsirkin | } |
195 | d5970055 | Michael S. Tsirkin | |
196 | d5970055 | Michael S. Tsirkin | int vhost_net_start(struct vhost_net *net, |
197 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
198 | d5970055 | Michael S. Tsirkin | { |
199 | d5970055 | Michael S. Tsirkin | return -ENOSYS;
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200 | d5970055 | Michael S. Tsirkin | } |
201 | d5970055 | Michael S. Tsirkin | void vhost_net_stop(struct vhost_net *net, |
202 | d5970055 | Michael S. Tsirkin | VirtIODevice *dev) |
203 | d5970055 | Michael S. Tsirkin | { |
204 | d5970055 | Michael S. Tsirkin | } |
205 | d5970055 | Michael S. Tsirkin | |
206 | d5970055 | Michael S. Tsirkin | void vhost_net_cleanup(struct vhost_net *net) |
207 | d5970055 | Michael S. Tsirkin | { |
208 | d5970055 | Michael S. Tsirkin | } |
209 | d5970055 | Michael S. Tsirkin | |
210 | d5970055 | Michael S. Tsirkin | unsigned vhost_net_get_features(struct vhost_net *net, unsigned features) |
211 | d5970055 | Michael S. Tsirkin | { |
212 | d5970055 | Michael S. Tsirkin | return features;
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213 | d5970055 | Michael S. Tsirkin | } |
214 | d5970055 | Michael S. Tsirkin | void vhost_net_ack_features(struct vhost_net *net, unsigned features) |
215 | d5970055 | Michael S. Tsirkin | { |
216 | d5970055 | Michael S. Tsirkin | } |
217 | d5970055 | Michael S. Tsirkin | #endif |