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16#include "qemu/osdep.h"
17#include "net/net.h"
18#include "net/tap.h"
19#include "net/vhost-user.h"
20
21#include "hw/virtio/virtio-net.h"
22#include "net/vhost_net.h"
23#include "qemu/error-report.h"
24
25
26#ifdef CONFIG_VHOST_NET
27#include <linux/vhost.h>
28#include <sys/socket.h>
29#include <linux/kvm.h>
30#include <netpacket/packet.h>
31#include <net/ethernet.h>
32#include <net/if.h>
33#include <netinet/in.h>
34
35
36#include "standard-headers/linux/virtio_ring.h"
37#include "hw/virtio/vhost.h"
38#include "hw/virtio/virtio-bus.h"
39
40struct vhost_net {
41 struct vhost_dev dev;
42 struct vhost_virtqueue vqs[2];
43 int backend;
44 NetClientState *nc;
45};
46
47
48static const int kernel_feature_bits[] = {
49 VIRTIO_F_NOTIFY_ON_EMPTY,
50 VIRTIO_RING_F_INDIRECT_DESC,
51 VIRTIO_RING_F_EVENT_IDX,
52 VIRTIO_NET_F_MRG_RXBUF,
53 VIRTIO_F_VERSION_1,
54 VHOST_INVALID_FEATURE_BIT
55};
56
57
58static const int user_feature_bits[] = {
59 VIRTIO_F_NOTIFY_ON_EMPTY,
60 VIRTIO_RING_F_INDIRECT_DESC,
61 VIRTIO_RING_F_EVENT_IDX,
62
63 VIRTIO_F_ANY_LAYOUT,
64 VIRTIO_F_VERSION_1,
65 VIRTIO_NET_F_CSUM,
66 VIRTIO_NET_F_GUEST_CSUM,
67 VIRTIO_NET_F_GSO,
68 VIRTIO_NET_F_GUEST_TSO4,
69 VIRTIO_NET_F_GUEST_TSO6,
70 VIRTIO_NET_F_GUEST_ECN,
71 VIRTIO_NET_F_GUEST_UFO,
72 VIRTIO_NET_F_HOST_TSO4,
73 VIRTIO_NET_F_HOST_TSO6,
74 VIRTIO_NET_F_HOST_ECN,
75 VIRTIO_NET_F_HOST_UFO,
76 VIRTIO_NET_F_MRG_RXBUF,
77
78
79 VIRTIO_NET_F_GUEST_ANNOUNCE,
80
81 VIRTIO_NET_F_MQ,
82
83 VHOST_INVALID_FEATURE_BIT
84};
85
86static const int *vhost_net_get_feature_bits(struct vhost_net *net)
87{
88 const int *feature_bits = 0;
89
90 switch (net->nc->info->type) {
91 case NET_CLIENT_DRIVER_TAP:
92 feature_bits = kernel_feature_bits;
93 break;
94 case NET_CLIENT_DRIVER_VHOST_USER:
95 feature_bits = user_feature_bits;
96 break;
97 default:
98 error_report("Feature bits not defined for this type: %d",
99 net->nc->info->type);
100 break;
101 }
102
103 return feature_bits;
104}
105
106uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
107{
108 return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
109 features);
110}
111
112void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
113{
114 net->dev.acked_features = net->dev.backend_features;
115 vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
116}
117
118uint64_t vhost_net_get_max_queues(VHostNetState *net)
119{
120 return net->dev.max_queues;
121}
122
123uint64_t vhost_net_get_acked_features(VHostNetState *net)
124{
125 return net->dev.acked_features;
126}
127
128static int vhost_net_get_fd(NetClientState *backend)
129{
130 switch (backend->info->type) {
131 case NET_CLIENT_DRIVER_TAP:
132 return tap_get_fd(backend);
133 default:
134 fprintf(stderr, "vhost-net requires tap backend\n");
135 return -EBADFD;
136 }
137}
138
139struct vhost_net *vhost_net_init(VhostNetOptions *options)
140{
141 int r;
142 bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
143 struct vhost_net *net = g_new0(struct vhost_net, 1);
144 uint64_t features = 0;
145
146 if (!options->net_backend) {
147 fprintf(stderr, "vhost-net requires net backend to be setup\n");
148 goto fail;
149 }
150 net->nc = options->net_backend;
151
152 net->dev.max_queues = 1;
153 net->dev.nvqs = 2;
154 net->dev.vqs = net->vqs;
155
156 if (backend_kernel) {
157 r = vhost_net_get_fd(options->net_backend);
158 if (r < 0) {
159 goto fail;
160 }
161 net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
162 ? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
163 net->backend = r;
164 net->dev.protocol_features = 0;
165 } else {
166 net->dev.backend_features = 0;
167 net->dev.protocol_features = 0;
168 net->backend = -1;
169
170
171 net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
172 }
173
174 r = vhost_dev_init(&net->dev, options->opaque,
175 options->backend_type, options->busyloop_timeout);
176 if (r < 0) {
177 goto fail;
178 }
179 if (backend_kernel) {
180 if (!qemu_has_vnet_hdr_len(options->net_backend,
181 sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
182 net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
183 }
184 if (~net->dev.features & net->dev.backend_features) {
185 fprintf(stderr, "vhost lacks feature mask %" PRIu64
186 " for backend\n",
187 (uint64_t)(~net->dev.features & net->dev.backend_features));
188 goto fail;
189 }
190 }
191
192
193 if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
194 features = vhost_user_get_acked_features(net->nc);
195 if (~net->dev.features & features) {
196 fprintf(stderr, "vhost lacks feature mask %" PRIu64
197 " for backend\n",
198 (uint64_t)(~net->dev.features & features));
199 goto fail;
200 }
201 }
202
203 vhost_net_ack_features(net, features);
204
205 return net;
206
207fail:
208 vhost_dev_cleanup(&net->dev);
209 g_free(net);
210 return NULL;
211}
212
213static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
214{
215 net->dev.vq_index = vq_index;
216}
217
218static int vhost_net_start_one(struct vhost_net *net,
219 VirtIODevice *dev)
220{
221 struct vhost_vring_file file = { };
222 int r;
223
224 net->dev.nvqs = 2;
225 net->dev.vqs = net->vqs;
226
227 r = vhost_dev_enable_notifiers(&net->dev, dev);
228 if (r < 0) {
229 goto fail_notifiers;
230 }
231
232 r = vhost_dev_start(&net->dev, dev);
233 if (r < 0) {
234 goto fail_start;
235 }
236
237 if (net->nc->info->poll) {
238 net->nc->info->poll(net->nc, false);
239 }
240
241 if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
242 qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
243 file.fd = net->backend;
244 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
245 r = vhost_net_set_backend(&net->dev, &file);
246 if (r < 0) {
247 r = -errno;
248 goto fail;
249 }
250 }
251 }
252 return 0;
253fail:
254 file.fd = -1;
255 if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
256 while (file.index-- > 0) {
257 int r = vhost_net_set_backend(&net->dev, &file);
258 assert(r >= 0);
259 }
260 }
261 if (net->nc->info->poll) {
262 net->nc->info->poll(net->nc, true);
263 }
264 vhost_dev_stop(&net->dev, dev);
265fail_start:
266 vhost_dev_disable_notifiers(&net->dev, dev);
267fail_notifiers:
268 return r;
269}
270
271static void vhost_net_stop_one(struct vhost_net *net,
272 VirtIODevice *dev)
273{
274 struct vhost_vring_file file = { .fd = -1 };
275
276 if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
277 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
278 int r = vhost_net_set_backend(&net->dev, &file);
279 assert(r >= 0);
280 }
281 }
282 if (net->nc->info->poll) {
283 net->nc->info->poll(net->nc, true);
284 }
285 vhost_dev_stop(&net->dev, dev);
286 vhost_dev_disable_notifiers(&net->dev, dev);
287}
288
289int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
290 int total_queues)
291{
292 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
293 VirtioBusState *vbus = VIRTIO_BUS(qbus);
294 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
295 int r, e, i;
296
297 if (!k->set_guest_notifiers) {
298 error_report("binding does not support guest notifiers");
299 return -ENOSYS;
300 }
301
302 for (i = 0; i < total_queues; i++) {
303 struct vhost_net *net;
304
305 net = get_vhost_net(ncs[i].peer);
306 vhost_net_set_vq_index(net, i * 2);
307
308
309
310
311
312 if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
313 dev->use_guest_notifier_mask = false;
314 }
315 }
316
317 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
318 if (r < 0) {
319 error_report("Error binding guest notifier: %d", -r);
320 goto err;
321 }
322
323 for (i = 0; i < total_queues; i++) {
324 r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
325
326 if (r < 0) {
327 goto err_start;
328 }
329
330 if (ncs[i].peer->vring_enable) {
331
332 r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
333
334 if (r < 0) {
335 goto err_start;
336 }
337 }
338 }
339
340 return 0;
341
342err_start:
343 while (--i >= 0) {
344 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
345 }
346 e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
347 if (e < 0) {
348 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
349 fflush(stderr);
350 }
351err:
352 return r;
353}
354
355void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
356 int total_queues)
357{
358 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
359 VirtioBusState *vbus = VIRTIO_BUS(qbus);
360 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
361 int i, r;
362
363 for (i = 0; i < total_queues; i++) {
364 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
365 }
366
367 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
368 if (r < 0) {
369 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
370 fflush(stderr);
371 }
372 assert(r >= 0);
373}
374
375void vhost_net_cleanup(struct vhost_net *net)
376{
377 vhost_dev_cleanup(&net->dev);
378}
379
380int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
381{
382 const VhostOps *vhost_ops = net->dev.vhost_ops;
383
384 assert(vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
385 assert(vhost_ops->vhost_migration_done);
386
387 return vhost_ops->vhost_migration_done(&net->dev, mac_addr);
388}
389
390bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
391{
392 return vhost_virtqueue_pending(&net->dev, idx);
393}
394
395void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
396 int idx, bool mask)
397{
398 vhost_virtqueue_mask(&net->dev, dev, idx, mask);
399}
400
401VHostNetState *get_vhost_net(NetClientState *nc)
402{
403 VHostNetState *vhost_net = 0;
404
405 if (!nc) {
406 return 0;
407 }
408
409 switch (nc->info->type) {
410 case NET_CLIENT_DRIVER_TAP:
411 vhost_net = tap_get_vhost_net(nc);
412 break;
413 case NET_CLIENT_DRIVER_VHOST_USER:
414 vhost_net = vhost_user_get_vhost_net(nc);
415 assert(vhost_net);
416 break;
417 default:
418 break;
419 }
420
421 return vhost_net;
422}
423
424int vhost_set_vring_enable(NetClientState *nc, int enable)
425{
426 VHostNetState *net = get_vhost_net(nc);
427 const VhostOps *vhost_ops = net->dev.vhost_ops;
428
429 nc->vring_enable = enable;
430
431 if (vhost_ops && vhost_ops->vhost_set_vring_enable) {
432 return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
433 }
434
435 return 0;
436}
437
438#else
439uint64_t vhost_net_get_max_queues(VHostNetState *net)
440{
441 return 1;
442}
443
444struct vhost_net *vhost_net_init(VhostNetOptions *options)
445{
446 error_report("vhost-net support is not compiled in");
447 return NULL;
448}
449
450int vhost_net_start(VirtIODevice *dev,
451 NetClientState *ncs,
452 int total_queues)
453{
454 return -ENOSYS;
455}
456void vhost_net_stop(VirtIODevice *dev,
457 NetClientState *ncs,
458 int total_queues)
459{
460}
461
462void vhost_net_cleanup(struct vhost_net *net)
463{
464}
465
466uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
467{
468 return features;
469}
470
471void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
472{
473}
474
475uint64_t vhost_net_get_acked_features(VHostNetState *net)
476{
477 return 0;
478}
479
480bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
481{
482 return false;
483}
484
485void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
486 int idx, bool mask)
487{
488}
489
490int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
491{
492 return -1;
493}
494
495VHostNetState *get_vhost_net(NetClientState *nc)
496{
497 return 0;
498}
499
500int vhost_set_vring_enable(NetClientState *nc, int enable)
501{
502 return 0;
503}
504#endif
505