qmp-commands: remove query-qmp-schema from txt
[qemu/ar7.git] / hw / net / vhost_net.c
blob6280422d02a907da98a3a791aa61dc993a919787
1 /*
2 * vhost-net support
4 * Copyright Red Hat, Inc. 2010
6 * Authors:
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.
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.
16 #include "qemu/osdep.h"
17 #include "net/net.h"
18 #include "net/tap.h"
19 #include "net/vhost-user.h"
21 #include "hw/virtio/virtio-net.h"
22 #include "net/vhost_net.h"
23 #include "qemu/error-report.h"
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>
36 #include "standard-headers/linux/virtio_ring.h"
37 #include "hw/virtio/vhost.h"
38 #include "hw/virtio/virtio-bus.h"
40 struct vhost_net {
41 struct vhost_dev dev;
42 struct vhost_virtqueue vqs[2];
43 int backend;
44 NetClientState *nc;
47 /* Features supported by host kernel. */
48 static 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 VIRTIO_NET_F_MTU,
55 VHOST_INVALID_FEATURE_BIT
58 /* Features supported by others. */
59 static const int user_feature_bits[] = {
60 VIRTIO_F_NOTIFY_ON_EMPTY,
61 VIRTIO_RING_F_INDIRECT_DESC,
62 VIRTIO_RING_F_EVENT_IDX,
64 VIRTIO_F_ANY_LAYOUT,
65 VIRTIO_F_VERSION_1,
66 VIRTIO_NET_F_CSUM,
67 VIRTIO_NET_F_GUEST_CSUM,
68 VIRTIO_NET_F_GSO,
69 VIRTIO_NET_F_GUEST_TSO4,
70 VIRTIO_NET_F_GUEST_TSO6,
71 VIRTIO_NET_F_GUEST_ECN,
72 VIRTIO_NET_F_GUEST_UFO,
73 VIRTIO_NET_F_HOST_TSO4,
74 VIRTIO_NET_F_HOST_TSO6,
75 VIRTIO_NET_F_HOST_ECN,
76 VIRTIO_NET_F_HOST_UFO,
77 VIRTIO_NET_F_MRG_RXBUF,
78 VIRTIO_NET_F_MTU,
80 /* This bit implies RARP isn't sent by QEMU out of band */
81 VIRTIO_NET_F_GUEST_ANNOUNCE,
83 VIRTIO_NET_F_MQ,
85 VHOST_INVALID_FEATURE_BIT
88 static const int *vhost_net_get_feature_bits(struct vhost_net *net)
90 const int *feature_bits = 0;
92 switch (net->nc->info->type) {
93 case NET_CLIENT_DRIVER_TAP:
94 feature_bits = kernel_feature_bits;
95 break;
96 case NET_CLIENT_DRIVER_VHOST_USER:
97 feature_bits = user_feature_bits;
98 break;
99 default:
100 error_report("Feature bits not defined for this type: %d",
101 net->nc->info->type);
102 break;
105 return feature_bits;
108 uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
110 return vhost_get_features(&net->dev, vhost_net_get_feature_bits(net),
111 features);
114 void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
116 net->dev.acked_features = net->dev.backend_features;
117 vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
120 uint64_t vhost_net_get_max_queues(VHostNetState *net)
122 return net->dev.max_queues;
125 uint64_t vhost_net_get_acked_features(VHostNetState *net)
127 return net->dev.acked_features;
130 static int vhost_net_get_fd(NetClientState *backend)
132 switch (backend->info->type) {
133 case NET_CLIENT_DRIVER_TAP:
134 return tap_get_fd(backend);
135 default:
136 fprintf(stderr, "vhost-net requires tap backend\n");
137 return -EBADFD;
141 struct vhost_net *vhost_net_init(VhostNetOptions *options)
143 int r;
144 bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL;
145 struct vhost_net *net = g_new0(struct vhost_net, 1);
146 uint64_t features = 0;
148 if (!options->net_backend) {
149 fprintf(stderr, "vhost-net requires net backend to be setup\n");
150 goto fail;
152 net->nc = options->net_backend;
154 net->dev.max_queues = 1;
155 net->dev.nvqs = 2;
156 net->dev.vqs = net->vqs;
158 if (backend_kernel) {
159 r = vhost_net_get_fd(options->net_backend);
160 if (r < 0) {
161 goto fail;
163 net->dev.backend_features = qemu_has_vnet_hdr(options->net_backend)
164 ? 0 : (1ULL << VHOST_NET_F_VIRTIO_NET_HDR);
165 net->backend = r;
166 net->dev.protocol_features = 0;
167 } else {
168 net->dev.backend_features = 0;
169 net->dev.protocol_features = 0;
170 net->backend = -1;
172 /* vhost-user needs vq_index to initiate a specific queue pair */
173 net->dev.vq_index = net->nc->queue_index * net->dev.nvqs;
176 r = vhost_dev_init(&net->dev, options->opaque,
177 options->backend_type, options->busyloop_timeout);
178 if (r < 0) {
179 goto fail;
181 if (backend_kernel) {
182 if (!qemu_has_vnet_hdr_len(options->net_backend,
183 sizeof(struct virtio_net_hdr_mrg_rxbuf))) {
184 net->dev.features &= ~(1ULL << VIRTIO_NET_F_MRG_RXBUF);
186 if (~net->dev.features & net->dev.backend_features) {
187 fprintf(stderr, "vhost lacks feature mask %" PRIu64
188 " for backend\n",
189 (uint64_t)(~net->dev.features & net->dev.backend_features));
190 goto fail;
194 /* Set sane init value. Override when guest acks. */
195 if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
196 features = vhost_user_get_acked_features(net->nc);
197 if (~net->dev.features & features) {
198 fprintf(stderr, "vhost lacks feature mask %" PRIu64
199 " for backend\n",
200 (uint64_t)(~net->dev.features & features));
201 goto fail;
205 vhost_net_ack_features(net, features);
207 return net;
209 fail:
210 vhost_dev_cleanup(&net->dev);
211 g_free(net);
212 return NULL;
215 static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index)
217 net->dev.vq_index = vq_index;
220 static int vhost_net_start_one(struct vhost_net *net,
221 VirtIODevice *dev)
223 struct vhost_vring_file file = { };
224 int r;
226 net->dev.nvqs = 2;
227 net->dev.vqs = net->vqs;
229 r = vhost_dev_enable_notifiers(&net->dev, dev);
230 if (r < 0) {
231 goto fail_notifiers;
234 r = vhost_dev_start(&net->dev, dev);
235 if (r < 0) {
236 goto fail_start;
239 if (net->nc->info->poll) {
240 net->nc->info->poll(net->nc, false);
243 if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
244 qemu_set_fd_handler(net->backend, NULL, NULL, NULL);
245 file.fd = net->backend;
246 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
247 r = vhost_net_set_backend(&net->dev, &file);
248 if (r < 0) {
249 r = -errno;
250 goto fail;
254 return 0;
255 fail:
256 file.fd = -1;
257 if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
258 while (file.index-- > 0) {
259 int r = vhost_net_set_backend(&net->dev, &file);
260 assert(r >= 0);
263 if (net->nc->info->poll) {
264 net->nc->info->poll(net->nc, true);
266 vhost_dev_stop(&net->dev, dev);
267 fail_start:
268 vhost_dev_disable_notifiers(&net->dev, dev);
269 fail_notifiers:
270 return r;
273 static void vhost_net_stop_one(struct vhost_net *net,
274 VirtIODevice *dev)
276 struct vhost_vring_file file = { .fd = -1 };
278 if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) {
279 for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
280 int r = vhost_net_set_backend(&net->dev, &file);
281 assert(r >= 0);
284 if (net->nc->info->poll) {
285 net->nc->info->poll(net->nc, true);
287 vhost_dev_stop(&net->dev, dev);
288 vhost_dev_disable_notifiers(&net->dev, dev);
291 int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
292 int total_queues)
294 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
295 VirtioBusState *vbus = VIRTIO_BUS(qbus);
296 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
297 int r, e, i;
299 if (!k->set_guest_notifiers) {
300 error_report("binding does not support guest notifiers");
301 return -ENOSYS;
304 for (i = 0; i < total_queues; i++) {
305 struct vhost_net *net;
307 net = get_vhost_net(ncs[i].peer);
308 vhost_net_set_vq_index(net, i * 2);
310 /* Suppress the masking guest notifiers on vhost user
311 * because vhost user doesn't interrupt masking/unmasking
312 * properly.
314 if (net->nc->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
315 dev->use_guest_notifier_mask = false;
319 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
320 if (r < 0) {
321 error_report("Error binding guest notifier: %d", -r);
322 goto err;
325 for (i = 0; i < total_queues; i++) {
326 r = vhost_net_start_one(get_vhost_net(ncs[i].peer), dev);
328 if (r < 0) {
329 goto err_start;
332 if (ncs[i].peer->vring_enable) {
333 /* restore vring enable state */
334 r = vhost_set_vring_enable(ncs[i].peer, ncs[i].peer->vring_enable);
336 if (r < 0) {
337 goto err_start;
342 return 0;
344 err_start:
345 while (--i >= 0) {
346 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
348 e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
349 if (e < 0) {
350 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
351 fflush(stderr);
353 err:
354 return r;
357 void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
358 int total_queues)
360 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
361 VirtioBusState *vbus = VIRTIO_BUS(qbus);
362 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
363 int i, r;
365 for (i = 0; i < total_queues; i++) {
366 vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
369 r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
370 if (r < 0) {
371 fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
372 fflush(stderr);
374 assert(r >= 0);
377 void vhost_net_cleanup(struct vhost_net *net)
379 vhost_dev_cleanup(&net->dev);
382 int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
384 const VhostOps *vhost_ops = net->dev.vhost_ops;
386 assert(vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
387 assert(vhost_ops->vhost_migration_done);
389 return vhost_ops->vhost_migration_done(&net->dev, mac_addr);
392 bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
394 return vhost_virtqueue_pending(&net->dev, idx);
397 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
398 int idx, bool mask)
400 vhost_virtqueue_mask(&net->dev, dev, idx, mask);
403 VHostNetState *get_vhost_net(NetClientState *nc)
405 VHostNetState *vhost_net = 0;
407 if (!nc) {
408 return 0;
411 switch (nc->info->type) {
412 case NET_CLIENT_DRIVER_TAP:
413 vhost_net = tap_get_vhost_net(nc);
414 break;
415 case NET_CLIENT_DRIVER_VHOST_USER:
416 vhost_net = vhost_user_get_vhost_net(nc);
417 assert(vhost_net);
418 break;
419 default:
420 break;
423 return vhost_net;
426 int vhost_set_vring_enable(NetClientState *nc, int enable)
428 VHostNetState *net = get_vhost_net(nc);
429 const VhostOps *vhost_ops = net->dev.vhost_ops;
431 nc->vring_enable = enable;
433 if (vhost_ops && vhost_ops->vhost_set_vring_enable) {
434 return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
437 return 0;
440 int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
442 const VhostOps *vhost_ops = net->dev.vhost_ops;
444 if (!vhost_ops->vhost_net_set_mtu) {
445 return 0;
448 return vhost_ops->vhost_net_set_mtu(&net->dev, mtu);
451 #else
452 uint64_t vhost_net_get_max_queues(VHostNetState *net)
454 return 1;
457 struct vhost_net *vhost_net_init(VhostNetOptions *options)
459 error_report("vhost-net support is not compiled in");
460 return NULL;
463 int vhost_net_start(VirtIODevice *dev,
464 NetClientState *ncs,
465 int total_queues)
467 return -ENOSYS;
469 void vhost_net_stop(VirtIODevice *dev,
470 NetClientState *ncs,
471 int total_queues)
475 void vhost_net_cleanup(struct vhost_net *net)
479 uint64_t vhost_net_get_features(struct vhost_net *net, uint64_t features)
481 return features;
484 void vhost_net_ack_features(struct vhost_net *net, uint64_t features)
488 uint64_t vhost_net_get_acked_features(VHostNetState *net)
490 return 0;
493 bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
495 return false;
498 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
499 int idx, bool mask)
503 int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr)
505 return -1;
508 VHostNetState *get_vhost_net(NetClientState *nc)
510 return 0;
513 int vhost_set_vring_enable(NetClientState *nc, int enable)
515 return 0;
518 int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
520 return 0;
522 #endif