Revert "vhost-user: add multi queue support"
[qemu.git] / hw / net / vhost_net.c
1 /*
2 * vhost-net support
3 *
4 * Copyright Red Hat, Inc. 2010
5 *
6 * Authors:
7 * Michael S. Tsirkin <mst@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
14 */
15
16 #include "net/net.h"
17 #include "net/tap.h"
18 #include "net/vhost-user.h"
19
20 #include "hw/virtio/virtio-net.h"
21 #include "net/vhost_net.h"
22 #include "qemu/error-report.h"
23
24 #include "config.h"
25
26 #ifdef CONFIG_VHOST_NET
27 #include <linux/vhost.h>
28 #include <sys/socket.h>
29 #include <linux/kvm.h>
30 #include <fcntl.h>
31 #include <netpacket/packet.h>
32 #include <net/ethernet.h>
33 #include <net/if.h>
34 #include <netinet/in.h>
35
36 #include <stdio.h>
37
38 #include "standard-headers/linux/virtio_ring.h"
39 #include "hw/virtio/vhost.h"
40 #include "hw/virtio/virtio-bus.h"
41 #include "hw/virtio/virtio-access.h"
42
43 struct vhost_net {
44 struct vhost_dev dev;
45 struct vhost_virtqueue vqs[2];
46 int backend;
47 NetClientState *nc;
48 };
49
50 /* Features supported by host kernel. */
51 static const int kernel_feature_bits[] = {
52 VIRTIO_F_NOTIFY_ON_EMPTY,
53 VIRTIO_RING_F_INDIRECT_DESC,
54 VIRTIO_RING_F_EVENT_IDX,
55 VIRTIO_NET_F_MRG_RXBUF,
56 VIRTIO_F_VERSION_1,
57 VHOST_INVALID_FEATURE_BIT
58 };
59
60 /* Features supported by others. */
61 static const int user_feature_bits[] = {
62 VIRTIO_F_NOTIFY_ON_EMPTY,
63 VIRTIO_RING_F_INDIRECT_DESC,
64 VIRTIO_RING_F_EVENT_IDX,
65
66 VIRTIO_F_ANY_LAYOUT,
67 VIRTIO_F_VERSION_1,
68 VIRTIO_NET_F_CSUM,
69 VIRTIO_NET_F_GUEST_CSUM,
70 VIRTIO_NET_F_GSO,
71 VIRTIO_NET_F_GUEST_TSO4,
72 VIRTIO_NET_F_GUEST_TSO6,
73 VIRTIO_NET_F_GUEST_ECN,
74 VIRTIO_NET_F_GUEST_UFO,
75 VIRTIO_NET_F_HOST_TSO4,
76 VIRTIO_NET_F_HOST_TSO6,
77 VIRTIO_NET_F_HOST_ECN,
78 VIRTIO_NET_F_HOST_UFO,
79 VIRTIO_NET_F_MRG_RXBUF,
80 VIRTIO_NET_F_STATUS,
81 VIRTIO_NET_F_CTRL_VQ,
82 VIRTIO_NET_F_CTRL_RX,
83 VIRTIO_NET_F_CTRL_VLAN,
84 VIRTIO_NET_F_CTRL_RX_EXTRA,
85 VIRTIO_NET_F_CTRL_MAC_ADDR,
86 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
87
88 VIRTIO_NET_F_MQ,
89
90 VHOST_INVALID_FEATURE_BIT
91 };
92
93 static const int *vhost_net_get_feature_bits(struct vhost_net *net)
94 {
95 const int *feature_bits = 0;
96
97 switch (net->nc->info->type) {
98 case NET_CLIENT_OPTIONS_KIND_TAP:
99 feature_bits = kernel_feature_bits;
100 break;
101 case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
102 feature_bits = user_feature_bits;
103 break;
104 default:
105 error_report("Feature bits not defined for this type: %d",
106 net->nc->info->type);
107 break;
108 }
109
110 return feature_bits;
111 }
112
113 uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
114 {
115 return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
116 features);
117 }
118
119 void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
120 {
121 net->dev.acked_features = net->dev.backend_features;
122 vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
123 }
124
125 static int vhost_net_get_fd(NetClientState *backend)
126 {
127 switch (backend->info->type) {
128 case NET_CLIENT_OPTIONS_KIND_TAP:
129 return tap_get_fd(backend);
130 default:
131 fprintf(stderr, "vhost-net requires tap backend\n");
132 return -EBADFD;
133 }
134 }
135
136 struct vhost_net *vhost_net_init(VhostNetOptions *options)
137 {
138 int r;
139 bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
140 struct vhost_net *net = g_malloc(sizeof *net);
141
142 if (!options->net_backend) {
143 fprintf(stderr, "vhost-net requires net backend to be setup\n");
144 goto fail;
145 }
146
147 if (backend_kernel) {
148 r = vhost_net_get_fd(options->net_backend);
149 if (r < 0) {
150 goto fail;
151 }
152 net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
153 ? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
154 net->backend = r;
155 } else {
156 net->dev.backend_features = 0;
157 net->backend = -1;
158 }
159 net->nc = options->net_backend;
160
161 net->dev.nvqs = 2;
162 net->dev.vqs = net->vqs;
163
164 r = vhost_dev_init(&net->dev, options->opaque,
165 options->backend_type);
166 if (r < 0) {
167 goto fail;
168 }
169 if (backend_kernel) {
170 if (!qemu_has_vnet_hdr_len(options->net_backend,
171 sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
172 net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
173 }
174 if (~net->dev.features & net->dev.backend_features) {
175 fprintf(stderr, "vhost lacks feature mask %" PRIu64
176 " for backend\n",
177 (uint64_t)(~net->dev.features & net->dev.backend_features));
178 vhost_dev_cleanup(&net->dev);
179 goto fail;
180 }
181 }
182 /* Set sane init value. Override when guest acks. */
183 vhost_net_ack_features(net, 0);
184 return net;
185 fail:
186 g_free(net);
187 return NULL;
188 }
189
190 static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
191 {
192 net->dev.vq_index = vq_index;
193 }
194
195 static int vhost_net_set_vnet_endian(VirtIODevice *dev, NetClientState *peer,
196 bool set)
197 {
198 int r = 0;
199
200 if (virtio_has_feature(dev, VIRTIO_F_VERSION_1) ||
201 (virtio_legacy_is_cross_endian(dev) && !virtio_is_big_endian(dev))) {
202 r = qemu_set_vnet_le(peer, set);
203 if (r) {
204 error_report("backend does not support LE vnet headers");
205 }
206 } else if (virtio_legacy_is_cross_endian(dev)) {
207 r = qemu_set_vnet_be(peer, set);
208 if (r) {
209 error_report("backend does not support BE vnet headers");
210 }
211 }
212
213 return r;
214 }
215
216 static int vhost_net_start_one(struct vhost_net *net,
217 VirtIODevice *dev)
218 {
219 struct vhost_vring_file file = { };
220 int r;
221
222 net->dev.nvqs = 2;
223 net->dev.vqs = net->vqs;
224
225 r = vhost_dev_enable_notifiers(&net->dev, dev);
226 if (r < 0) {
227 goto fail_notifiers;
228 }
229
230 r = vhost_dev_start(&net->dev, dev);
231 if (r < 0) {
232 goto fail_start;
233 }
234
235 if (net->nc->info->poll) {
236 net->nc->info->poll(net->nc, false);
237 }
238
239 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
240 qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
241 file.fd = net->backend;
242 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
243 const VhostOps *vhost_ops = net->dev.vhost_ops;
244 r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
245 &file);
246 if (r < 0) {
247 r = -errno;
248 goto fail;
249 }
250 }
251 }
252 return 0;
253 fail:
254 file.fd = -1;
255 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
256 while (file.index-- > 0) {
257 const VhostOps *vhost_ops = net->dev.vhost_ops;
258 int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
259 &file);
260 assert(r >= 0);
261 }
262 }
263 if (net->nc->info->poll) {
264 net->nc->info->poll(net->nc, true);
265 }
266 vhost_dev_stop(&net->dev, dev);
267 fail_start:
268 vhost_dev_disable_notifiers(&net->dev, dev);
269 fail_notifiers:
270 return r;
271 }
272
273 static void vhost_net_stop_one(struct vhost_net *net,
274 VirtIODevice *dev)
275 {
276 struct vhost_vring_file file = { .fd = -1 };
277
278 if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_TAP) {
279 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
280 const VhostOps *vhost_ops = net->dev.vhost_ops;
281 int r = vhost_ops->vhost_call(&net->dev, VHOST_NET_SET_BACKEND,
282 &file);
283 assert(r >= 0);
284 }
285 } else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
286 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
287 const VhostOps *vhost_ops = net->dev.vhost_ops;
288 int r = vhost_ops->vhost_call(&net->dev, VHOST_RESET_OWNER,
289 NULL);
290 assert(r >= 0);
291 }
292 }
293 if (net->nc->info->poll) {
294 net->nc->info->poll(net->nc, true);
295 }
296 vhost_dev_stop(&net->dev, dev);
297 vhost_dev_disable_notifiers(&net->dev, dev);
298 }
299
300 int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
301 int total_queues)
302 {
303 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
304 VirtioBusState *vbus = VIRTIO_BUS(qbus);
305 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
306 int r, e, i;
307
308 if (!k->set_guest_notifiers) {
309 error_report("binding does not support guest notifiers");
310 r = -ENOSYS;
311 goto err;
312 }
313
314 r = vhost_net_set_vnet_endian(dev, ncs[0].peer, true);
315 if (r < 0) {
316 goto err;
317 }
318
319 for (i = 0; i < total_queues; i++) {
320 vhost_net_set_vq_index(get_vhost_net(ncs[i].peer), i * 2);
321 }
322
323 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
324 if (r < 0) {
325 error_report("Error binding guest notifier: %d", -r);
326 goto err_endian;
327 }
328
329 for (i = 0; i < total_queues; i++) {
330 r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
331
332 if (r < 0) {
333 goto err_start;
334 }
335 }
336
337 return 0;
338
339 err_start:
340 while (--i >= 0) {
341 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
342 }
343 e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
344 if (e < 0) {
345 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
346 fflush(stderr);
347 }
348 err_endian:
349 vhost_net_set_vnet_endian(dev, ncs[0].peer, false);
350 err:
351 return r;
352 }
353
354 void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
355 int total_queues)
356 {
357 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
358 VirtioBusState *vbus = VIRTIO_BUS(qbus);
359 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
360 int i, r;
361
362 for (i = 0; i < total_queues; i++) {
363 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
364 }
365
366 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
367 if (r < 0) {
368 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
369 fflush(stderr);
370 }
371 assert(r >= 0);
372
373 assert(vhost_net_set_vnet_endian(dev, ncs[0].peer, false) >= 0);
374 }
375
376 void vhost_net_cleanup(struct vhost_net *net)
377 {
378 vhost_dev_cleanup(&net->dev);
379 g_free(net);
380 }
381
382 bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
383 {
384 return vhost_virtqueue_pending(&net->dev, idx);
385 }
386
387 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
388 int idx, bool mask)
389 {
390 vhost_virtqueue_mask(&net->dev, dev, idx, mask);
391 }
392
393 VHostNetState *get_vhost_net(NetClientState *nc)
394 {
395 VHostNetState *vhost_net = 0;
396
397 if (!nc) {
398 return 0;
399 }
400
401 switch (nc->info->type) {
402 case NET_CLIENT_OPTIONS_KIND_TAP:
403 vhost_net = tap_get_vhost_net(nc);
404 break;
405 case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
406 vhost_net = vhost_user_get_vhost_net(nc);
407 break;
408 default:
409 break;
410 }
411
412 return vhost_net;
413 }
414 #else
415 struct vhost_net *vhost_net_init(VhostNetOptions *options)
416 {
417 error_report("vhost-net support is not compiled in");
418 return NULL;
419 }
420
421 int vhost_net_start(VirtIODevice *dev,
422 NetClientState *ncs,
423 int total_queues)
424 {
425 return -ENOSYS;
426 }
427 void vhost_net_stop(VirtIODevice *dev,
428 NetClientState *ncs,
429 int total_queues)
430 {
431 }
432
433 void vhost_net_cleanup(struct vhost_net *net)
434 {
435 }
436
437 uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
438 {
439 return features;
440 }
441 void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
442 {
443 }
444
445 bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
446 {
447 return false;
448 }
449
450 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
451 int idx, bool mask)
452 {
453 }
454
455 VHostNetState *get_vhost_net(NetClientState *nc)
456 {
457 return 0;
458 }
459 #endif