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armv7m: Classify faults as MemManage or BusFault
[qemu/ar7.git] / hw / net / virtio-net.c
blob9a3d769aa2ae5af8d1554816a7a5397f70e3524f
1 /*
2 * Virtio Network Device
3 *
4 * Copyright IBM, Corp. 2007
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.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 */
13
14 #include "qemu/osdep.h"
15 #include "qemu/iov.h"
16 #include "hw/virtio/virtio.h"
17 #include "net/net.h"
18 #include "net/checksum.h"
19 #include "net/tap.h"
20 #include "qemu/error-report.h"
21 #include "qemu/timer.h"
22 #include "hw/virtio/virtio-net.h"
23 #include "net/vhost_net.h"
24 #include "hw/virtio/virtio-bus.h"
25 #include "qapi/qmp/qjson.h"
26 #include "qapi-event.h"
27 #include "hw/virtio/virtio-access.h"
28
29 #define VIRTIO_NET_VM_VERSION 11
30
31 #define MAC_TABLE_ENTRIES 64
32 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
33
34 /* previously fixed value */
35 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
36 /* for now, only allow larger queues; with virtio-1, guest can downsize */
37 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
38
39 /*
40 * Calculate the number of bytes up to and including the given 'field' of
41 * 'container'.
42 */
43 #define endof(container, field) \
44 (offsetof(container, field) + sizeof(((container *)0)->field))
45
46 typedef struct VirtIOFeature {
47 uint32_t flags;
48 size_t end;
49 } VirtIOFeature;
50
51 static VirtIOFeature feature_sizes[] = {
52 {.flags = 1 << VIRTIO_NET_F_MAC,
53 .end = endof(struct virtio_net_config, mac)},
54 {.flags = 1 << VIRTIO_NET_F_STATUS,
55 .end = endof(struct virtio_net_config, status)},
56 {.flags = 1 << VIRTIO_NET_F_MQ,
57 .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
58 {.flags = 1 << VIRTIO_NET_F_MTU,
59 .end = endof(struct virtio_net_config, mtu)},
60 {}
61 };
62
63 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
64 {
65 VirtIONet *n = qemu_get_nic_opaque(nc);
66
67 return &n->vqs[nc->queue_index];
68 }
69
70 static int vq2q(int queue_index)
71 {
72 return queue_index / 2;
73 }
74
75 /* TODO
76 * - we could suppress RX interrupt if we were so inclined.
77 */
78
79 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
80 {
81 VirtIONet *n = VIRTIO_NET(vdev);
82 struct virtio_net_config netcfg;
83
84 virtio_stw_p(vdev, &netcfg.status, n->status);
85 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
86 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
87 memcpy(netcfg.mac, n->mac, ETH_ALEN);
88 memcpy(config, &netcfg, n->config_size);
89 }
90
91 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
92 {
93 VirtIONet *n = VIRTIO_NET(vdev);
94 struct virtio_net_config netcfg = {};
95
96 memcpy(&netcfg, config, n->config_size);
97
98 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
99 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
100 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
101 memcpy(n->mac, netcfg.mac, ETH_ALEN);
102 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
103 }
104 }
105
106 static bool virtio_net_started(VirtIONet *n, uint8_t status)
107 {
108 VirtIODevice *vdev = VIRTIO_DEVICE(n);
109 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
110 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
111 }
112
113 static void virtio_net_announce_timer(void *opaque)
114 {
115 VirtIONet *n = opaque;
116 VirtIODevice *vdev = VIRTIO_DEVICE(n);
117
118 n->announce_counter--;
119 n->status |= VIRTIO_NET_S_ANNOUNCE;
120 virtio_notify_config(vdev);
121 }
122
123 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
124 {
125 VirtIODevice *vdev = VIRTIO_DEVICE(n);
126 NetClientState *nc = qemu_get_queue(n->nic);
127 int queues = n->multiqueue ? n->max_queues : 1;
128
129 if (!get_vhost_net(nc->peer)) {
130 return;
131 }
132
133 if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
134 !!n->vhost_started) {
135 return;
136 }
137 if (!n->vhost_started) {
138 int r, i;
139
140 if (n->needs_vnet_hdr_swap) {
141 error_report("backend does not support %s vnet headers; "
142 "falling back on userspace virtio",
143 virtio_is_big_endian(vdev) ? "BE" : "LE");
144 return;
145 }
146
147 /* Any packets outstanding? Purge them to avoid touching rings
148 * when vhost is running.
149 */
150 for (i = 0; i < queues; i++) {
151 NetClientState *qnc = qemu_get_subqueue(n->nic, i);
152
153 /* Purge both directions: TX and RX. */
154 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
155 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
156 }
157
158 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) {
159 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu);
160 if (r < 0) {
161 error_report("%uBytes MTU not supported by the backend",
162 n->net_conf.mtu);
163
164 return;
165 }
166 }
167
168 n->vhost_started = 1;
169 r = vhost_net_start(vdev, n->nic->ncs, queues);
170 if (r < 0) {
171 error_report("unable to start vhost net: %d: "
172 "falling back on userspace virtio", -r);
173 n->vhost_started = 0;
174 }
175 } else {
176 vhost_net_stop(vdev, n->nic->ncs, queues);
177 n->vhost_started = 0;
178 }
179 }
180
181 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev,
182 NetClientState *peer,
183 bool enable)
184 {
185 if (virtio_is_big_endian(vdev)) {
186 return qemu_set_vnet_be(peer, enable);
187 } else {
188 return qemu_set_vnet_le(peer, enable);
189 }
190 }
191
192 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs,
193 int queues, bool enable)
194 {
195 int i;
196
197 for (i = 0; i < queues; i++) {
198 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 &&
199 enable) {
200 while (--i >= 0) {
201 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false);
202 }
203
204 return true;
205 }
206 }
207
208 return false;
209 }
210
211 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status)
212 {
213 VirtIODevice *vdev = VIRTIO_DEVICE(n);
214 int queues = n->multiqueue ? n->max_queues : 1;
215
216 if (virtio_net_started(n, status)) {
217 /* Before using the device, we tell the network backend about the
218 * endianness to use when parsing vnet headers. If the backend
219 * can't do it, we fallback onto fixing the headers in the core
220 * virtio-net code.
221 */
222 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs,
223 queues, true);
224 } else if (virtio_net_started(n, vdev->status)) {
225 /* After using the device, we need to reset the network backend to
226 * the default (guest native endianness), otherwise the guest may
227 * lose network connectivity if it is rebooted into a different
228 * endianness.
229 */
230 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false);
231 }
232 }
233
234 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq)
235 {
236 unsigned int dropped = virtqueue_drop_all(vq);
237 if (dropped) {
238 virtio_notify(vdev, vq);
239 }
240 }
241
242 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
243 {
244 VirtIONet *n = VIRTIO_NET(vdev);
245 VirtIONetQueue *q;
246 int i;
247 uint8_t queue_status;
248
249 virtio_net_vnet_endian_status(n, status);
250 virtio_net_vhost_status(n, status);
251
252 for (i = 0; i < n->max_queues; i++) {
253 NetClientState *ncs = qemu_get_subqueue(n->nic, i);
254 bool queue_started;
255 q = &n->vqs[i];
256
257 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
258 queue_status = 0;
259 } else {
260 queue_status = status;
261 }
262 queue_started =
263 virtio_net_started(n, queue_status) && !n->vhost_started;
264
265 if (queue_started) {
266 qemu_flush_queued_packets(ncs);
267 }
268
269 if (!q->tx_waiting) {
270 continue;
271 }
272
273 if (queue_started) {
274 if (q->tx_timer) {
275 timer_mod(q->tx_timer,
276 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
277 } else {
278 qemu_bh_schedule(q->tx_bh);
279 }
280 } else {
281 if (q->tx_timer) {
282 timer_del(q->tx_timer);
283 } else {
284 qemu_bh_cancel(q->tx_bh);
285 }
286 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
287 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK)) {
288 /* if tx is waiting we are likely have some packets in tx queue
289 * and disabled notification */
290 q->tx_waiting = 0;
291 virtio_queue_set_notification(q->tx_vq, 1);
292 virtio_net_drop_tx_queue_data(vdev, q->tx_vq);
293 }
294 }
295 }
296 }
297
298 static void virtio_net_set_link_status(NetClientState *nc)
299 {
300 VirtIONet *n = qemu_get_nic_opaque(nc);
301 VirtIODevice *vdev = VIRTIO_DEVICE(n);
302 uint16_t old_status = n->status;
303
304 if (nc->link_down)
305 n->status &= ~VIRTIO_NET_S_LINK_UP;
306 else
307 n->status |= VIRTIO_NET_S_LINK_UP;
308
309 if (n->status != old_status)
310 virtio_notify_config(vdev);
311
312 virtio_net_set_status(vdev, vdev->status);
313 }
314
315 static void rxfilter_notify(NetClientState *nc)
316 {
317 VirtIONet *n = qemu_get_nic_opaque(nc);
318
319 if (nc->rxfilter_notify_enabled) {
320 gchar *path = object_get_canonical_path(OBJECT(n->qdev));
321 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
322 n->netclient_name, path, &error_abort);
323 g_free(path);
324
325 /* disable event notification to avoid events flooding */
326 nc->rxfilter_notify_enabled = 0;
327 }
328 }
329
330 static intList *get_vlan_table(VirtIONet *n)
331 {
332 intList *list, *entry;
333 int i, j;
334
335 list = NULL;
336 for (i = 0; i < MAX_VLAN >> 5; i++) {
337 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
338 if (n->vlans[i] & (1U << j)) {
339 entry = g_malloc0(sizeof(*entry));
340 entry->value = (i << 5) + j;
341 entry->next = list;
342 list = entry;
343 }
344 }
345 }
346
347 return list;
348 }
349
350 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
351 {
352 VirtIONet *n = qemu_get_nic_opaque(nc);
353 VirtIODevice *vdev = VIRTIO_DEVICE(n);
354 RxFilterInfo *info;
355 strList *str_list, *entry;
356 int i;
357
358 info = g_malloc0(sizeof(*info));
359 info->name = g_strdup(nc->name);
360 info->promiscuous = n->promisc;
361
362 if (n->nouni) {
363 info->unicast = RX_STATE_NONE;
364 } else if (n->alluni) {
365 info->unicast = RX_STATE_ALL;
366 } else {
367 info->unicast = RX_STATE_NORMAL;
368 }
369
370 if (n->nomulti) {
371 info->multicast = RX_STATE_NONE;
372 } else if (n->allmulti) {
373 info->multicast = RX_STATE_ALL;
374 } else {
375 info->multicast = RX_STATE_NORMAL;
376 }
377
378 info->broadcast_allowed = n->nobcast;
379 info->multicast_overflow = n->mac_table.multi_overflow;
380 info->unicast_overflow = n->mac_table.uni_overflow;
381
382 info->main_mac = qemu_mac_strdup_printf(n->mac);
383
384 str_list = NULL;
385 for (i = 0; i < n->mac_table.first_multi; i++) {
386 entry = g_malloc0(sizeof(*entry));
387 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
388 entry->next = str_list;
389 str_list = entry;
390 }
391 info->unicast_table = str_list;
392
393 str_list = NULL;
394 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
395 entry = g_malloc0(sizeof(*entry));
396 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
397 entry->next = str_list;
398 str_list = entry;
399 }
400 info->multicast_table = str_list;
401 info->vlan_table = get_vlan_table(n);
402
403 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
404 info->vlan = RX_STATE_ALL;
405 } else if (!info->vlan_table) {
406 info->vlan = RX_STATE_NONE;
407 } else {
408 info->vlan = RX_STATE_NORMAL;
409 }
410
411 /* enable event notification after query */
412 nc->rxfilter_notify_enabled = 1;
413
414 return info;
415 }
416
417 static void virtio_net_reset(VirtIODevice *vdev)
418 {
419 VirtIONet *n = VIRTIO_NET(vdev);
420
421 /* Reset back to compatibility mode */
422 n->promisc = 1;
423 n->allmulti = 0;
424 n->alluni = 0;
425 n->nomulti = 0;
426 n->nouni = 0;
427 n->nobcast = 0;
428 /* multiqueue is disabled by default */
429 n->curr_queues = 1;
430 timer_del(n->announce_timer);
431 n->announce_counter = 0;
432 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
433
434 /* Flush any MAC and VLAN filter table state */
435 n->mac_table.in_use = 0;
436 n->mac_table.first_multi = 0;
437 n->mac_table.multi_overflow = 0;
438 n->mac_table.uni_overflow = 0;
439 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
440 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
441 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
442 memset(n->vlans, 0, MAX_VLAN >> 3);
443 }
444
445 static void peer_test_vnet_hdr(VirtIONet *n)
446 {
447 NetClientState *nc = qemu_get_queue(n->nic);
448 if (!nc->peer) {
449 return;
450 }
451
452 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
453 }
454
455 static int peer_has_vnet_hdr(VirtIONet *n)
456 {
457 return n->has_vnet_hdr;
458 }
459
460 static int peer_has_ufo(VirtIONet *n)
461 {
462 if (!peer_has_vnet_hdr(n))
463 return 0;
464
465 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
466
467 return n->has_ufo;
468 }
469
470 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
471 int version_1)
472 {
473 int i;
474 NetClientState *nc;
475
476 n->mergeable_rx_bufs = mergeable_rx_bufs;
477
478 if (version_1) {
479 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
480 } else {
481 n->guest_hdr_len = n->mergeable_rx_bufs ?
482 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
483 sizeof(struct virtio_net_hdr);
484 }
485
486 for (i = 0; i < n->max_queues; i++) {
487 nc = qemu_get_subqueue(n->nic, i);
488
489 if (peer_has_vnet_hdr(n) &&
490 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
491 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
492 n->host_hdr_len = n->guest_hdr_len;
493 }
494 }
495 }
496
497 static int peer_attach(VirtIONet *n, int index)
498 {
499 NetClientState *nc = qemu_get_subqueue(n->nic, index);
500
501 if (!nc->peer) {
502 return 0;
503 }
504
505 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
506 vhost_set_vring_enable(nc->peer, 1);
507 }
508
509 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
510 return 0;
511 }
512
513 if (n->max_queues == 1) {
514 return 0;
515 }
516
517 return tap_enable(nc->peer);
518 }
519
520 static int peer_detach(VirtIONet *n, int index)
521 {
522 NetClientState *nc = qemu_get_subqueue(n->nic, index);
523
524 if (!nc->peer) {
525 return 0;
526 }
527
528 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
529 vhost_set_vring_enable(nc->peer, 0);
530 }
531
532 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
533 return 0;
534 }
535
536 return tap_disable(nc->peer);
537 }
538
539 static void virtio_net_set_queues(VirtIONet *n)
540 {
541 int i;
542 int r;
543
544 if (n->nic->peer_deleted) {
545 return;
546 }
547
548 for (i = 0; i < n->max_queues; i++) {
549 if (i < n->curr_queues) {
550 r = peer_attach(n, i);
551 assert(!r);
552 } else {
553 r = peer_detach(n, i);
554 assert(!r);
555 }
556 }
557 }
558
559 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
560
561 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
562 Error **errp)
563 {
564 VirtIONet *n = VIRTIO_NET(vdev);
565 NetClientState *nc = qemu_get_queue(n->nic);
566
567 /* Firstly sync all virtio-net possible supported features */
568 features |= n->host_features;
569
570 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
571
572 if (!peer_has_vnet_hdr(n)) {
573 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
574 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
575 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
576 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
577
578 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
579 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
580 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
581 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
582 }
583
584 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
585 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
586 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
587 }
588
589 if (!get_vhost_net(nc->peer)) {
590 return features;
591 }
592 features = vhost_net_get_features(get_vhost_net(nc->peer), features);
593 vdev->backend_features = features;
594
595 if (n->mtu_bypass_backend &&
596 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
597 features |= (1ULL << VIRTIO_NET_F_MTU);
598 }
599
600 return features;
601 }
602
603 static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
604 {
605 uint64_t features = 0;
606
607 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
608 * but also these: */
609 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
610 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
611 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
612 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
613 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
614
615 return features;
616 }
617
618 static void virtio_net_apply_guest_offloads(VirtIONet *n)
619 {
620 qemu_set_offload(qemu_get_queue(n->nic)->peer,
621 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
622 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
623 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
624 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
625 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
626 }
627
628 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
629 {
630 static const uint64_t guest_offloads_mask =
631 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
632 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
633 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
634 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
635 (1ULL << VIRTIO_NET_F_GUEST_UFO);
636
637 return guest_offloads_mask & features;
638 }
639
640 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
641 {
642 VirtIODevice *vdev = VIRTIO_DEVICE(n);
643 return virtio_net_guest_offloads_by_features(vdev->guest_features);
644 }
645
646 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
647 {
648 VirtIONet *n = VIRTIO_NET(vdev);
649 int i;
650
651 if (n->mtu_bypass_backend &&
652 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) {
653 features &= ~(1ULL << VIRTIO_NET_F_MTU);
654 }
655
656 virtio_net_set_multiqueue(n,
657 virtio_has_feature(features, VIRTIO_NET_F_MQ));
658
659 virtio_net_set_mrg_rx_bufs(n,
660 virtio_has_feature(features,
661 VIRTIO_NET_F_MRG_RXBUF),
662 virtio_has_feature(features,
663 VIRTIO_F_VERSION_1));
664
665 if (n->has_vnet_hdr) {
666 n->curr_guest_offloads =
667 virtio_net_guest_offloads_by_features(features);
668 virtio_net_apply_guest_offloads(n);
669 }
670
671 for (i = 0; i < n->max_queues; i++) {
672 NetClientState *nc = qemu_get_subqueue(n->nic, i);
673
674 if (!get_vhost_net(nc->peer)) {
675 continue;
676 }
677 vhost_net_ack_features(get_vhost_net(nc->peer), features);
678 }
679
680 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
681 memset(n->vlans, 0, MAX_VLAN >> 3);
682 } else {
683 memset(n->vlans, 0xff, MAX_VLAN >> 3);
684 }
685 }
686
687 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
688 struct iovec *iov, unsigned int iov_cnt)
689 {
690 uint8_t on;
691 size_t s;
692 NetClientState *nc = qemu_get_queue(n->nic);
693
694 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
695 if (s != sizeof(on)) {
696 return VIRTIO_NET_ERR;
697 }
698
699 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
700 n->promisc = on;
701 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
702 n->allmulti = on;
703 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
704 n->alluni = on;
705 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
706 n->nomulti = on;
707 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
708 n->nouni = on;
709 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
710 n->nobcast = on;
711 } else {
712 return VIRTIO_NET_ERR;
713 }
714
715 rxfilter_notify(nc);
716
717 return VIRTIO_NET_OK;
718 }
719
720 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
721 struct iovec *iov, unsigned int iov_cnt)
722 {
723 VirtIODevice *vdev = VIRTIO_DEVICE(n);
724 uint64_t offloads;
725 size_t s;
726
727 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
728 return VIRTIO_NET_ERR;
729 }
730
731 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
732 if (s != sizeof(offloads)) {
733 return VIRTIO_NET_ERR;
734 }
735
736 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
737 uint64_t supported_offloads;
738
739 if (!n->has_vnet_hdr) {
740 return VIRTIO_NET_ERR;
741 }
742
743 supported_offloads = virtio_net_supported_guest_offloads(n);
744 if (offloads & ~supported_offloads) {
745 return VIRTIO_NET_ERR;
746 }
747
748 n->curr_guest_offloads = offloads;
749 virtio_net_apply_guest_offloads(n);
750
751 return VIRTIO_NET_OK;
752 } else {
753 return VIRTIO_NET_ERR;
754 }
755 }
756
757 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
758 struct iovec *iov, unsigned int iov_cnt)
759 {
760 VirtIODevice *vdev = VIRTIO_DEVICE(n);
761 struct virtio_net_ctrl_mac mac_data;
762 size_t s;
763 NetClientState *nc = qemu_get_queue(n->nic);
764
765 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
766 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
767 return VIRTIO_NET_ERR;
768 }
769 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
770 assert(s == sizeof(n->mac));
771 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
772 rxfilter_notify(nc);
773
774 return VIRTIO_NET_OK;
775 }
776
777 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
778 return VIRTIO_NET_ERR;
779 }
780
781 int in_use = 0;
782 int first_multi = 0;
783 uint8_t uni_overflow = 0;
784 uint8_t multi_overflow = 0;
785 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
786
787 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
788 sizeof(mac_data.entries));
789 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
790 if (s != sizeof(mac_data.entries)) {
791 goto error;
792 }
793 iov_discard_front(&iov, &iov_cnt, s);
794
795 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
796 goto error;
797 }
798
799 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
800 s = iov_to_buf(iov, iov_cnt, 0, macs,
801 mac_data.entries * ETH_ALEN);
802 if (s != mac_data.entries * ETH_ALEN) {
803 goto error;
804 }
805 in_use += mac_data.entries;
806 } else {
807 uni_overflow = 1;
808 }
809
810 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
811
812 first_multi = in_use;
813
814 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
815 sizeof(mac_data.entries));
816 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
817 if (s != sizeof(mac_data.entries)) {
818 goto error;
819 }
820
821 iov_discard_front(&iov, &iov_cnt, s);
822
823 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
824 goto error;
825 }
826
827 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
828 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
829 mac_data.entries * ETH_ALEN);
830 if (s != mac_data.entries * ETH_ALEN) {
831 goto error;
832 }
833 in_use += mac_data.entries;
834 } else {
835 multi_overflow = 1;
836 }
837
838 n->mac_table.in_use = in_use;
839 n->mac_table.first_multi = first_multi;
840 n->mac_table.uni_overflow = uni_overflow;
841 n->mac_table.multi_overflow = multi_overflow;
842 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
843 g_free(macs);
844 rxfilter_notify(nc);
845
846 return VIRTIO_NET_OK;
847
848 error:
849 g_free(macs);
850 return VIRTIO_NET_ERR;
851 }
852
853 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
854 struct iovec *iov, unsigned int iov_cnt)
855 {
856 VirtIODevice *vdev = VIRTIO_DEVICE(n);
857 uint16_t vid;
858 size_t s;
859 NetClientState *nc = qemu_get_queue(n->nic);
860
861 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
862 vid = virtio_lduw_p(vdev, &vid);
863 if (s != sizeof(vid)) {
864 return VIRTIO_NET_ERR;
865 }
866
867 if (vid >= MAX_VLAN)
868 return VIRTIO_NET_ERR;
869
870 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
871 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
872 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
873 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
874 else
875 return VIRTIO_NET_ERR;
876
877 rxfilter_notify(nc);
878
879 return VIRTIO_NET_OK;
880 }
881
882 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
883 struct iovec *iov, unsigned int iov_cnt)
884 {
885 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
886 n->status & VIRTIO_NET_S_ANNOUNCE) {
887 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
888 if (n->announce_counter) {
889 timer_mod(n->announce_timer,
890 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
891 self_announce_delay(n->announce_counter));
892 }
893 return VIRTIO_NET_OK;
894 } else {
895 return VIRTIO_NET_ERR;
896 }
897 }
898
899 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
900 struct iovec *iov, unsigned int iov_cnt)
901 {
902 VirtIODevice *vdev = VIRTIO_DEVICE(n);
903 struct virtio_net_ctrl_mq mq;
904 size_t s;
905 uint16_t queues;
906
907 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
908 if (s != sizeof(mq)) {
909 return VIRTIO_NET_ERR;
910 }
911
912 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
913 return VIRTIO_NET_ERR;
914 }
915
916 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
917
918 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
919 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
920 queues > n->max_queues ||
921 !n->multiqueue) {
922 return VIRTIO_NET_ERR;
923 }
924
925 n->curr_queues = queues;
926 /* stop the backend before changing the number of queues to avoid handling a
927 * disabled queue */
928 virtio_net_set_status(vdev, vdev->status);
929 virtio_net_set_queues(n);
930
931 return VIRTIO_NET_OK;
932 }
933
934 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
935 {
936 VirtIONet *n = VIRTIO_NET(vdev);
937 struct virtio_net_ctrl_hdr ctrl;
938 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
939 VirtQueueElement *elem;
940 size_t s;
941 struct iovec *iov, *iov2;
942 unsigned int iov_cnt;
943
944 for (;;) {
945 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
946 if (!elem) {
947 break;
948 }
949 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) ||
950 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) {
951 virtio_error(vdev, "virtio-net ctrl missing headers");
952 virtqueue_detach_element(vq, elem, 0);
953 g_free(elem);
954 break;
955 }
956
957 iov_cnt = elem->out_num;
958 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num);
959 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
960 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
961 if (s != sizeof(ctrl)) {
962 status = VIRTIO_NET_ERR;
963 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
964 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
965 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
966 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
967 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
968 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
969 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
970 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
971 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
972 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
973 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
974 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
975 }
976
977 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status));
978 assert(s == sizeof(status));
979
980 virtqueue_push(vq, elem, sizeof(status));
981 virtio_notify(vdev, vq);
982 g_free(iov2);
983 g_free(elem);
984 }
985 }
986
987 /* RX */
988
989 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
990 {
991 VirtIONet *n = VIRTIO_NET(vdev);
992 int queue_index = vq2q(virtio_get_queue_index(vq));
993
994 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
995 }
996
997 static int virtio_net_can_receive(NetClientState *nc)
998 {
999 VirtIONet *n = qemu_get_nic_opaque(nc);
1000 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1001 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1002
1003 if (!vdev->vm_running) {
1004 return 0;
1005 }
1006
1007 if (nc->queue_index >= n->curr_queues) {
1008 return 0;
1009 }
1010
1011 if (!virtio_queue_ready(q->rx_vq) ||
1012 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1013 return 0;
1014 }
1015
1016 return 1;
1017 }
1018
1019 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
1020 {
1021 VirtIONet *n = q->n;
1022 if (virtio_queue_empty(q->rx_vq) ||
1023 (n->mergeable_rx_bufs &&
1024 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1025 virtio_queue_set_notification(q->rx_vq, 1);
1026
1027 /* To avoid a race condition where the guest has made some buffers
1028 * available after the above check but before notification was
1029 * enabled, check for available buffers again.
1030 */
1031 if (virtio_queue_empty(q->rx_vq) ||
1032 (n->mergeable_rx_bufs &&
1033 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1034 return 0;
1035 }
1036 }
1037
1038 virtio_queue_set_notification(q->rx_vq, 0);
1039 return 1;
1040 }
1041
1042 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
1043 {
1044 virtio_tswap16s(vdev, &hdr->hdr_len);
1045 virtio_tswap16s(vdev, &hdr->gso_size);
1046 virtio_tswap16s(vdev, &hdr->csum_start);
1047 virtio_tswap16s(vdev, &hdr->csum_offset);
1048 }
1049
1050 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
1051 * it never finds out that the packets don't have valid checksums. This
1052 * causes dhclient to get upset. Fedora's carried a patch for ages to
1053 * fix this with Xen but it hasn't appeared in an upstream release of
1054 * dhclient yet.
1055 *
1056 * To avoid breaking existing guests, we catch udp packets and add
1057 * checksums. This is terrible but it's better than hacking the guest
1058 * kernels.
1059 *
1060 * N.B. if we introduce a zero-copy API, this operation is no longer free so
1061 * we should provide a mechanism to disable it to avoid polluting the host
1062 * cache.
1063 */
1064 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
1065 uint8_t *buf, size_t size)
1066 {
1067 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
1068 (size > 27 && size < 1500) && /* normal sized MTU */
1069 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
1070 (buf[23] == 17) && /* ip.protocol == UDP */
1071 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
1072 net_checksum_calculate(buf, size);
1073 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
1074 }
1075 }
1076
1077 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
1078 const void *buf, size_t size)
1079 {
1080 if (n->has_vnet_hdr) {
1081 /* FIXME this cast is evil */
1082 void *wbuf = (void *)buf;
1083 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
1084 size - n->host_hdr_len);
1085
1086 if (n->needs_vnet_hdr_swap) {
1087 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
1088 }
1089 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
1090 } else {
1091 struct virtio_net_hdr hdr = {
1092 .flags = 0,
1093 .gso_type = VIRTIO_NET_HDR_GSO_NONE
1094 };
1095 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
1096 }
1097 }
1098
1099 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
1100 {
1101 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1102 static const uint8_t vlan[] = {0x81, 0x00};
1103 uint8_t *ptr = (uint8_t *)buf;
1104 int i;
1105
1106 if (n->promisc)
1107 return 1;
1108
1109 ptr += n->host_hdr_len;
1110
1111 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
1112 int vid = lduw_be_p(ptr + 14) & 0xfff;
1113 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
1114 return 0;
1115 }
1116
1117 if (ptr[0] & 1) { // multicast
1118 if (!memcmp(ptr, bcast, sizeof(bcast))) {
1119 return !n->nobcast;
1120 } else if (n->nomulti) {
1121 return 0;
1122 } else if (n->allmulti || n->mac_table.multi_overflow) {
1123 return 1;
1124 }
1125
1126 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
1127 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1128 return 1;
1129 }
1130 }
1131 } else { // unicast
1132 if (n->nouni) {
1133 return 0;
1134 } else if (n->alluni || n->mac_table.uni_overflow) {
1135 return 1;
1136 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
1137 return 1;
1138 }
1139
1140 for (i = 0; i < n->mac_table.first_multi; i++) {
1141 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1142 return 1;
1143 }
1144 }
1145 }
1146
1147 return 0;
1148 }
1149
1150 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
1151 size_t size)
1152 {
1153 VirtIONet *n = qemu_get_nic_opaque(nc);
1154 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1155 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1156 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1157 struct virtio_net_hdr_mrg_rxbuf mhdr;
1158 unsigned mhdr_cnt = 0;
1159 size_t offset, i, guest_offset;
1160
1161 if (!virtio_net_can_receive(nc)) {
1162 return -1;
1163 }
1164
1165 /* hdr_len refers to the header we supply to the guest */
1166 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1167 return 0;
1168 }
1169
1170 if (!receive_filter(n, buf, size))
1171 return size;
1172
1173 offset = i = 0;
1174
1175 while (offset < size) {
1176 VirtQueueElement *elem;
1177 int len, total;
1178 const struct iovec *sg;
1179
1180 total = 0;
1181
1182 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
1183 if (!elem) {
1184 if (i) {
1185 virtio_error(vdev, "virtio-net unexpected empty queue: "
1186 "i %zd mergeable %d offset %zd, size %zd, "
1187 "guest hdr len %zd, host hdr len %zd "
1188 "guest features 0x%" PRIx64,
1189 i, n->mergeable_rx_bufs, offset, size,
1190 n->guest_hdr_len, n->host_hdr_len,
1191 vdev->guest_features);
1192 }
1193 return -1;
1194 }
1195
1196 if (elem->in_num < 1) {
1197 virtio_error(vdev,
1198 "virtio-net receive queue contains no in buffers");
1199 virtqueue_detach_element(q->rx_vq, elem, 0);
1200 g_free(elem);
1201 return -1;
1202 }
1203
1204 sg = elem->in_sg;
1205 if (i == 0) {
1206 assert(offset == 0);
1207 if (n->mergeable_rx_bufs) {
1208 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1209 sg, elem->in_num,
1210 offsetof(typeof(mhdr), num_buffers),
1211 sizeof(mhdr.num_buffers));
1212 }
1213
1214 receive_header(n, sg, elem->in_num, buf, size);
1215 offset = n->host_hdr_len;
1216 total += n->guest_hdr_len;
1217 guest_offset = n->guest_hdr_len;
1218 } else {
1219 guest_offset = 0;
1220 }
1221
1222 /* copy in packet. ugh */
1223 len = iov_from_buf(sg, elem->in_num, guest_offset,
1224 buf + offset, size - offset);
1225 total += len;
1226 offset += len;
1227 /* If buffers can't be merged, at this point we
1228 * must have consumed the complete packet.
1229 * Otherwise, drop it. */
1230 if (!n->mergeable_rx_bufs && offset < size) {
1231 virtqueue_unpop(q->rx_vq, elem, total);
1232 g_free(elem);
1233 return size;
1234 }
1235
1236 /* signal other side */
1237 virtqueue_fill(q->rx_vq, elem, total, i++);
1238 g_free(elem);
1239 }
1240
1241 if (mhdr_cnt) {
1242 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1243 iov_from_buf(mhdr_sg, mhdr_cnt,
1244 0,
1245 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1246 }
1247
1248 virtqueue_flush(q->rx_vq, i);
1249 virtio_notify(vdev, q->rx_vq);
1250
1251 return size;
1252 }
1253
1254 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
1255 size_t size)
1256 {
1257 ssize_t r;
1258
1259 rcu_read_lock();
1260 r = virtio_net_receive_rcu(nc, buf, size);
1261 rcu_read_unlock();
1262 return r;
1263 }
1264
1265 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1266
1267 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1268 {
1269 VirtIONet *n = qemu_get_nic_opaque(nc);
1270 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1271 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1272
1273 virtqueue_push(q->tx_vq, q->async_tx.elem, 0);
1274 virtio_notify(vdev, q->tx_vq);
1275
1276 g_free(q->async_tx.elem);
1277 q->async_tx.elem = NULL;
1278
1279 virtio_queue_set_notification(q->tx_vq, 1);
1280 virtio_net_flush_tx(q);
1281 }
1282
1283 /* TX */
1284 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1285 {
1286 VirtIONet *n = q->n;
1287 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1288 VirtQueueElement *elem;
1289 int32_t num_packets = 0;
1290 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1291 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1292 return num_packets;
1293 }
1294
1295 if (q->async_tx.elem) {
1296 virtio_queue_set_notification(q->tx_vq, 0);
1297 return num_packets;
1298 }
1299
1300 for (;;) {
1301 ssize_t ret;
1302 unsigned int out_num;
1303 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
1304 struct virtio_net_hdr_mrg_rxbuf mhdr;
1305
1306 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
1307 if (!elem) {
1308 break;
1309 }
1310
1311 out_num = elem->out_num;
1312 out_sg = elem->out_sg;
1313 if (out_num < 1) {
1314 virtio_error(vdev, "virtio-net header not in first element");
1315 virtqueue_detach_element(q->tx_vq, elem, 0);
1316 g_free(elem);
1317 return -EINVAL;
1318 }
1319
1320 if (n->has_vnet_hdr) {
1321 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
1322 n->guest_hdr_len) {
1323 virtio_error(vdev, "virtio-net header incorrect");
1324 virtqueue_detach_element(q->tx_vq, elem, 0);
1325 g_free(elem);
1326 return -EINVAL;
1327 }
1328 if (n->needs_vnet_hdr_swap) {
1329 virtio_net_hdr_swap(vdev, (void *) &mhdr);
1330 sg2[0].iov_base = &mhdr;
1331 sg2[0].iov_len = n->guest_hdr_len;
1332 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
1333 out_sg, out_num,
1334 n->guest_hdr_len, -1);
1335 if (out_num == VIRTQUEUE_MAX_SIZE) {
1336 goto drop;
1337 }
1338 out_num += 1;
1339 out_sg = sg2;
1340 }
1341 }
1342 /*
1343 * If host wants to see the guest header as is, we can
1344 * pass it on unchanged. Otherwise, copy just the parts
1345 * that host is interested in.
1346 */
1347 assert(n->host_hdr_len <= n->guest_hdr_len);
1348 if (n->host_hdr_len != n->guest_hdr_len) {
1349 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1350 out_sg, out_num,
1351 0, n->host_hdr_len);
1352 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1353 out_sg, out_num,
1354 n->guest_hdr_len, -1);
1355 out_num = sg_num;
1356 out_sg = sg;
1357 }
1358
1359 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1360 out_sg, out_num, virtio_net_tx_complete);
1361 if (ret == 0) {
1362 virtio_queue_set_notification(q->tx_vq, 0);
1363 q->async_tx.elem = elem;
1364 return -EBUSY;
1365 }
1366
1367 drop:
1368 virtqueue_push(q->tx_vq, elem, 0);
1369 virtio_notify(vdev, q->tx_vq);
1370 g_free(elem);
1371
1372 if (++num_packets >= n->tx_burst) {
1373 break;
1374 }
1375 }
1376 return num_packets;
1377 }
1378
1379 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1380 {
1381 VirtIONet *n = VIRTIO_NET(vdev);
1382 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1383
1384 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
1385 virtio_net_drop_tx_queue_data(vdev, vq);
1386 return;
1387 }
1388
1389 /* This happens when device was stopped but VCPU wasn't. */
1390 if (!vdev->vm_running) {
1391 q->tx_waiting = 1;
1392 return;
1393 }
1394
1395 if (q->tx_waiting) {
1396 virtio_queue_set_notification(vq, 1);
1397 timer_del(q->tx_timer);
1398 q->tx_waiting = 0;
1399 if (virtio_net_flush_tx(q) == -EINVAL) {
1400 return;
1401 }
1402 } else {
1403 timer_mod(q->tx_timer,
1404 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1405 q->tx_waiting = 1;
1406 virtio_queue_set_notification(vq, 0);
1407 }
1408 }
1409
1410 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1411 {
1412 VirtIONet *n = VIRTIO_NET(vdev);
1413 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1414
1415 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
1416 virtio_net_drop_tx_queue_data(vdev, vq);
1417 return;
1418 }
1419
1420 if (unlikely(q->tx_waiting)) {
1421 return;
1422 }
1423 q->tx_waiting = 1;
1424 /* This happens when device was stopped but VCPU wasn't. */
1425 if (!vdev->vm_running) {
1426 return;
1427 }
1428 virtio_queue_set_notification(vq, 0);
1429 qemu_bh_schedule(q->tx_bh);
1430 }
1431
1432 static void virtio_net_tx_timer(void *opaque)
1433 {
1434 VirtIONetQueue *q = opaque;
1435 VirtIONet *n = q->n;
1436 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1437 /* This happens when device was stopped but BH wasn't. */
1438 if (!vdev->vm_running) {
1439 /* Make sure tx waiting is set, so we'll run when restarted. */
1440 assert(q->tx_waiting);
1441 return;
1442 }
1443
1444 q->tx_waiting = 0;
1445
1446 /* Just in case the driver is not ready on more */
1447 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1448 return;
1449 }
1450
1451 virtio_queue_set_notification(q->tx_vq, 1);
1452 virtio_net_flush_tx(q);
1453 }
1454
1455 static void virtio_net_tx_bh(void *opaque)
1456 {
1457 VirtIONetQueue *q = opaque;
1458 VirtIONet *n = q->n;
1459 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1460 int32_t ret;
1461
1462 /* This happens when device was stopped but BH wasn't. */
1463 if (!vdev->vm_running) {
1464 /* Make sure tx waiting is set, so we'll run when restarted. */
1465 assert(q->tx_waiting);
1466 return;
1467 }
1468
1469 q->tx_waiting = 0;
1470
1471 /* Just in case the driver is not ready on more */
1472 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1473 return;
1474 }
1475
1476 ret = virtio_net_flush_tx(q);
1477 if (ret == -EBUSY || ret == -EINVAL) {
1478 return; /* Notification re-enable handled by tx_complete or device
1479 * broken */
1480 }
1481
1482 /* If we flush a full burst of packets, assume there are
1483 * more coming and immediately reschedule */
1484 if (ret >= n->tx_burst) {
1485 qemu_bh_schedule(q->tx_bh);
1486 q->tx_waiting = 1;
1487 return;
1488 }
1489
1490 /* If less than a full burst, re-enable notification and flush
1491 * anything that may have come in while we weren't looking. If
1492 * we find something, assume the guest is still active and reschedule */
1493 virtio_queue_set_notification(q->tx_vq, 1);
1494 ret = virtio_net_flush_tx(q);
1495 if (ret == -EINVAL) {
1496 return;
1497 } else if (ret > 0) {
1498 virtio_queue_set_notification(q->tx_vq, 0);
1499 qemu_bh_schedule(q->tx_bh);
1500 q->tx_waiting = 1;
1501 }
1502 }
1503
1504 static void virtio_net_add_queue(VirtIONet *n, int index)
1505 {
1506 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1507
1508 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
1509 virtio_net_handle_rx);
1510 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1511 n->vqs[index].tx_vq =
1512 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
1513 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1514 virtio_net_tx_timer,
1515 &n->vqs[index]);
1516 } else {
1517 n->vqs[index].tx_vq =
1518 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
1519 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
1520 }
1521
1522 n->vqs[index].tx_waiting = 0;
1523 n->vqs[index].n = n;
1524 }
1525
1526 static void virtio_net_del_queue(VirtIONet *n, int index)
1527 {
1528 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1529 VirtIONetQueue *q = &n->vqs[index];
1530 NetClientState *nc = qemu_get_subqueue(n->nic, index);
1531
1532 qemu_purge_queued_packets(nc);
1533
1534 virtio_del_queue(vdev, index * 2);
1535 if (q->tx_timer) {
1536 timer_del(q->tx_timer);
1537 timer_free(q->tx_timer);
1538 q->tx_timer = NULL;
1539 } else {
1540 qemu_bh_delete(q->tx_bh);
1541 q->tx_bh = NULL;
1542 }
1543 q->tx_waiting = 0;
1544 virtio_del_queue(vdev, index * 2 + 1);
1545 }
1546
1547 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues)
1548 {
1549 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1550 int old_num_queues = virtio_get_num_queues(vdev);
1551 int new_num_queues = new_max_queues * 2 + 1;
1552 int i;
1553
1554 assert(old_num_queues >= 3);
1555 assert(old_num_queues % 2 == 1);
1556
1557 if (old_num_queues == new_num_queues) {
1558 return;
1559 }
1560
1561 /*
1562 * We always need to remove and add ctrl vq if
1563 * old_num_queues != new_num_queues. Remove ctrl_vq first,
1564 * and then we only enter one of the following too loops.
1565 */
1566 virtio_del_queue(vdev, old_num_queues - 1);
1567
1568 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
1569 /* new_num_queues < old_num_queues */
1570 virtio_net_del_queue(n, i / 2);
1571 }
1572
1573 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
1574 /* new_num_queues > old_num_queues */
1575 virtio_net_add_queue(n, i / 2);
1576 }
1577
1578 /* add ctrl_vq last */
1579 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1580 }
1581
1582 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1583 {
1584 int max = multiqueue ? n->max_queues : 1;
1585
1586 n->multiqueue = multiqueue;
1587 virtio_net_change_num_queues(n, max);
1588
1589 virtio_net_set_queues(n);
1590 }
1591
1592 static int virtio_net_post_load_device(void *opaque, int version_id)
1593 {
1594 VirtIONet *n = opaque;
1595 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1596 int i, link_down;
1597
1598 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs,
1599 virtio_vdev_has_feature(vdev,
1600 VIRTIO_F_VERSION_1));
1601
1602 /* MAC_TABLE_ENTRIES may be different from the saved image */
1603 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) {
1604 n->mac_table.in_use = 0;
1605 }
1606
1607 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1608 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1609 }
1610
1611 if (peer_has_vnet_hdr(n)) {
1612 virtio_net_apply_guest_offloads(n);
1613 }
1614
1615 virtio_net_set_queues(n);
1616
1617 /* Find the first multicast entry in the saved MAC filter */
1618 for (i = 0; i < n->mac_table.in_use; i++) {
1619 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1620 break;
1621 }
1622 }
1623 n->mac_table.first_multi = i;
1624
1625 /* nc.link_down can't be migrated, so infer link_down according
1626 * to link status bit in n->status */
1627 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1628 for (i = 0; i < n->max_queues; i++) {
1629 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1630 }
1631
1632 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
1633 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
1634 n->announce_counter = SELF_ANNOUNCE_ROUNDS;
1635 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
1636 }
1637
1638 return 0;
1639 }
1640
1641 /* tx_waiting field of a VirtIONetQueue */
1642 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = {
1643 .name = "virtio-net-queue-tx_waiting",
1644 .fields = (VMStateField[]) {
1645 VMSTATE_UINT32(tx_waiting, VirtIONetQueue),
1646 VMSTATE_END_OF_LIST()
1647 },
1648 };
1649
1650 static bool max_queues_gt_1(void *opaque, int version_id)
1651 {
1652 return VIRTIO_NET(opaque)->max_queues > 1;
1653 }
1654
1655 static bool has_ctrl_guest_offloads(void *opaque, int version_id)
1656 {
1657 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque),
1658 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
1659 }
1660
1661 static bool mac_table_fits(void *opaque, int version_id)
1662 {
1663 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES;
1664 }
1665
1666 static bool mac_table_doesnt_fit(void *opaque, int version_id)
1667 {
1668 return !mac_table_fits(opaque, version_id);
1669 }
1670
1671 /* This temporary type is shared by all the WITH_TMP methods
1672 * although only some fields are used by each.
1673 */
1674 struct VirtIONetMigTmp {
1675 VirtIONet *parent;
1676 VirtIONetQueue *vqs_1;
1677 uint16_t curr_queues_1;
1678 uint8_t has_ufo;
1679 uint32_t has_vnet_hdr;
1680 };
1681
1682 /* The 2nd and subsequent tx_waiting flags are loaded later than
1683 * the 1st entry in the queues and only if there's more than one
1684 * entry. We use the tmp mechanism to calculate a temporary
1685 * pointer and count and also validate the count.
1686 */
1687
1688 static void virtio_net_tx_waiting_pre_save(void *opaque)
1689 {
1690 struct VirtIONetMigTmp *tmp = opaque;
1691
1692 tmp->vqs_1 = tmp->parent->vqs + 1;
1693 tmp->curr_queues_1 = tmp->parent->curr_queues - 1;
1694 if (tmp->parent->curr_queues == 0) {
1695 tmp->curr_queues_1 = 0;
1696 }
1697 }
1698
1699 static int virtio_net_tx_waiting_pre_load(void *opaque)
1700 {
1701 struct VirtIONetMigTmp *tmp = opaque;
1702
1703 /* Reuse the pointer setup from save */
1704 virtio_net_tx_waiting_pre_save(opaque);
1705
1706 if (tmp->parent->curr_queues > tmp->parent->max_queues) {
1707 error_report("virtio-net: curr_queues %x > max_queues %x",
1708 tmp->parent->curr_queues, tmp->parent->max_queues);
1709
1710 return -EINVAL;
1711 }
1712
1713 return 0; /* all good */
1714 }
1715
1716 static const VMStateDescription vmstate_virtio_net_tx_waiting = {
1717 .name = "virtio-net-tx_waiting",
1718 .pre_load = virtio_net_tx_waiting_pre_load,
1719 .pre_save = virtio_net_tx_waiting_pre_save,
1720 .fields = (VMStateField[]) {
1721 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp,
1722 curr_queues_1,
1723 vmstate_virtio_net_queue_tx_waiting,
1724 struct VirtIONetQueue),
1725 VMSTATE_END_OF_LIST()
1726 },
1727 };
1728
1729 /* the 'has_ufo' flag is just tested; if the incoming stream has the
1730 * flag set we need to check that we have it
1731 */
1732 static int virtio_net_ufo_post_load(void *opaque, int version_id)
1733 {
1734 struct VirtIONetMigTmp *tmp = opaque;
1735
1736 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) {
1737 error_report("virtio-net: saved image requires TUN_F_UFO support");
1738 return -EINVAL;
1739 }
1740
1741 return 0;
1742 }
1743
1744 static void virtio_net_ufo_pre_save(void *opaque)
1745 {
1746 struct VirtIONetMigTmp *tmp = opaque;
1747
1748 tmp->has_ufo = tmp->parent->has_ufo;
1749 }
1750
1751 static const VMStateDescription vmstate_virtio_net_has_ufo = {
1752 .name = "virtio-net-ufo",
1753 .post_load = virtio_net_ufo_post_load,
1754 .pre_save = virtio_net_ufo_pre_save,
1755 .fields = (VMStateField[]) {
1756 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp),
1757 VMSTATE_END_OF_LIST()
1758 },
1759 };
1760
1761 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
1762 * flag set we need to check that we have it
1763 */
1764 static int virtio_net_vnet_post_load(void *opaque, int version_id)
1765 {
1766 struct VirtIONetMigTmp *tmp = opaque;
1767
1768 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) {
1769 error_report("virtio-net: saved image requires vnet_hdr=on");
1770 return -EINVAL;
1771 }
1772
1773 return 0;
1774 }
1775
1776 static void virtio_net_vnet_pre_save(void *opaque)
1777 {
1778 struct VirtIONetMigTmp *tmp = opaque;
1779
1780 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
1781 }
1782
1783 static const VMStateDescription vmstate_virtio_net_has_vnet = {
1784 .name = "virtio-net-vnet",
1785 .post_load = virtio_net_vnet_post_load,
1786 .pre_save = virtio_net_vnet_pre_save,
1787 .fields = (VMStateField[]) {
1788 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp),
1789 VMSTATE_END_OF_LIST()
1790 },
1791 };
1792
1793 static const VMStateDescription vmstate_virtio_net_device = {
1794 .name = "virtio-net-device",
1795 .version_id = VIRTIO_NET_VM_VERSION,
1796 .minimum_version_id = VIRTIO_NET_VM_VERSION,
1797 .post_load = virtio_net_post_load_device,
1798 .fields = (VMStateField[]) {
1799 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN),
1800 VMSTATE_STRUCT_POINTER(vqs, VirtIONet,
1801 vmstate_virtio_net_queue_tx_waiting,
1802 VirtIONetQueue),
1803 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet),
1804 VMSTATE_UINT16(status, VirtIONet),
1805 VMSTATE_UINT8(promisc, VirtIONet),
1806 VMSTATE_UINT8(allmulti, VirtIONet),
1807 VMSTATE_UINT32(mac_table.in_use, VirtIONet),
1808
1809 /* Guarded pair: If it fits we load it, else we throw it away
1810 * - can happen if source has a larger MAC table.; post-load
1811 * sets flags in this case.
1812 */
1813 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet,
1814 0, mac_table_fits, mac_table.in_use,
1815 ETH_ALEN),
1816 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0,
1817 mac_table.in_use, ETH_ALEN),
1818
1819 /* Note: This is an array of uint32's that's always been saved as a
1820 * buffer; hold onto your endiannesses; it's actually used as a bitmap
1821 * but based on the uint.
1822 */
1823 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3),
1824 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1825 vmstate_virtio_net_has_vnet),
1826 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet),
1827 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet),
1828 VMSTATE_UINT8(alluni, VirtIONet),
1829 VMSTATE_UINT8(nomulti, VirtIONet),
1830 VMSTATE_UINT8(nouni, VirtIONet),
1831 VMSTATE_UINT8(nobcast, VirtIONet),
1832 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1833 vmstate_virtio_net_has_ufo),
1834 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0,
1835 vmstate_info_uint16_equal, uint16_t),
1836 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1),
1837 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1838 vmstate_virtio_net_tx_waiting),
1839 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet,
1840 has_ctrl_guest_offloads),
1841 VMSTATE_END_OF_LIST()
1842 },
1843 };
1844
1845 static NetClientInfo net_virtio_info = {
1846 .type = NET_CLIENT_DRIVER_NIC,
1847 .size = sizeof(NICState),
1848 .can_receive = virtio_net_can_receive,
1849 .receive = virtio_net_receive,
1850 .link_status_changed = virtio_net_set_link_status,
1851 .query_rx_filter = virtio_net_query_rxfilter,
1852 };
1853
1854 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1855 {
1856 VirtIONet *n = VIRTIO_NET(vdev);
1857 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1858 assert(n->vhost_started);
1859 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
1860 }
1861
1862 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
1863 bool mask)
1864 {
1865 VirtIONet *n = VIRTIO_NET(vdev);
1866 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1867 assert(n->vhost_started);
1868 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
1869 vdev, idx, mask);
1870 }
1871
1872 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
1873 {
1874 int i, config_size = 0;
1875 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
1876
1877 for (i = 0; feature_sizes[i].flags != 0; i++) {
1878 if (host_features & feature_sizes[i].flags) {
1879 config_size = MAX(feature_sizes[i].end, config_size);
1880 }
1881 }
1882 n->config_size = config_size;
1883 }
1884
1885 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1886 const char *type)
1887 {
1888 /*
1889 * The name can be NULL, the netclient name will be type.x.
1890 */
1891 assert(type != NULL);
1892
1893 g_free(n->netclient_name);
1894 g_free(n->netclient_type);
1895 n->netclient_name = g_strdup(name);
1896 n->netclient_type = g_strdup(type);
1897 }
1898
1899 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
1900 {
1901 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1902 VirtIONet *n = VIRTIO_NET(dev);
1903 NetClientState *nc;
1904 int i;
1905
1906 if (n->net_conf.mtu) {
1907 n->host_features |= (0x1 << VIRTIO_NET_F_MTU);
1908 }
1909
1910 virtio_net_set_config_size(n, n->host_features);
1911 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
1912
1913 /*
1914 * We set a lower limit on RX queue size to what it always was.
1915 * Guests that want a smaller ring can always resize it without
1916 * help from us (using virtio 1 and up).
1917 */
1918 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||
1919 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||
1920 (n->net_conf.rx_queue_size & (n->net_conf.rx_queue_size - 1))) {
1921 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "
1922 "must be a power of 2 between %d and %d.",
1923 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,
1924 VIRTQUEUE_MAX_SIZE);
1925 virtio_cleanup(vdev);
1926 return;
1927 }
1928
1929 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
1930 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
1931 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
1932 "must be a positive integer less than %d.",
1933 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
1934 virtio_cleanup(vdev);
1935 return;
1936 }
1937 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
1938 n->curr_queues = 1;
1939 n->tx_timeout = n->net_conf.txtimer;
1940
1941 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
1942 && strcmp(n->net_conf.tx, "bh")) {
1943 error_report("virtio-net: "
1944 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1945 n->net_conf.tx);
1946 error_report("Defaulting to \"bh\"");
1947 }
1948
1949 for (i = 0; i < n->max_queues; i++) {
1950 virtio_net_add_queue(n, i);
1951 }
1952
1953 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1954 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
1955 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
1956 n->status = VIRTIO_NET_S_LINK_UP;
1957 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
1958 virtio_net_announce_timer, n);
1959
1960 if (n->netclient_type) {
1961 /*
1962 * Happen when virtio_net_set_netclient_name has been called.
1963 */
1964 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1965 n->netclient_type, n->netclient_name, n);
1966 } else {
1967 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1968 object_get_typename(OBJECT(dev)), dev->id, n);
1969 }
1970
1971 peer_test_vnet_hdr(n);
1972 if (peer_has_vnet_hdr(n)) {
1973 for (i = 0; i < n->max_queues; i++) {
1974 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
1975 }
1976 n->host_hdr_len = sizeof(struct virtio_net_hdr);
1977 } else {
1978 n->host_hdr_len = 0;
1979 }
1980
1981 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
1982
1983 n->vqs[0].tx_waiting = 0;
1984 n->tx_burst = n->net_conf.txburst;
1985 virtio_net_set_mrg_rx_bufs(n, 0, 0);
1986 n->promisc = 1; /* for compatibility */
1987
1988 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1989
1990 n->vlans = g_malloc0(MAX_VLAN >> 3);
1991
1992 nc = qemu_get_queue(n->nic);
1993 nc->rxfilter_notify_enabled = 1;
1994
1995 n->qdev = dev;
1996 }
1997
1998 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
1999 {
2000 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
2001 VirtIONet *n = VIRTIO_NET(dev);
2002 int i, max_queues;
2003
2004 /* This will stop vhost backend if appropriate. */
2005 virtio_net_set_status(vdev, 0);
2006
2007 g_free(n->netclient_name);
2008 n->netclient_name = NULL;
2009 g_free(n->netclient_type);
2010 n->netclient_type = NULL;
2011
2012 g_free(n->mac_table.macs);
2013 g_free(n->vlans);
2014
2015 max_queues = n->multiqueue ? n->max_queues : 1;
2016 for (i = 0; i < max_queues; i++) {
2017 virtio_net_del_queue(n, i);
2018 }
2019
2020 timer_del(n->announce_timer);
2021 timer_free(n->announce_timer);
2022 g_free(n->vqs);
2023 qemu_del_nic(n->nic);
2024 virtio_cleanup(vdev);
2025 }
2026
2027 static void virtio_net_instance_init(Object *obj)
2028 {
2029 VirtIONet *n = VIRTIO_NET(obj);
2030
2031 /*
2032 * The default config_size is sizeof(struct virtio_net_config).
2033 * Can be overriden with virtio_net_set_config_size.
2034 */
2035 n->config_size = sizeof(struct virtio_net_config);
2036 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
2037 "bootindex", "/ethernet-phy@0",
2038 DEVICE(n), NULL);
2039 }
2040
2041 static void virtio_net_pre_save(void *opaque)
2042 {
2043 VirtIONet *n = opaque;
2044
2045 /* At this point, backend must be stopped, otherwise
2046 * it might keep writing to memory. */
2047 assert(!n->vhost_started);
2048 }
2049
2050 static const VMStateDescription vmstate_virtio_net = {
2051 .name = "virtio-net",
2052 .minimum_version_id = VIRTIO_NET_VM_VERSION,
2053 .version_id = VIRTIO_NET_VM_VERSION,
2054 .fields = (VMStateField[]) {
2055 VMSTATE_VIRTIO_DEVICE,
2056 VMSTATE_END_OF_LIST()
2057 },
2058 .pre_save = virtio_net_pre_save,
2059 };
2060
2061 static Property virtio_net_properties[] = {
2062 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true),
2063 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features,
2064 VIRTIO_NET_F_GUEST_CSUM, true),
2065 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
2066 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features,
2067 VIRTIO_NET_F_GUEST_TSO4, true),
2068 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features,
2069 VIRTIO_NET_F_GUEST_TSO6, true),
2070 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features,
2071 VIRTIO_NET_F_GUEST_ECN, true),
2072 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features,
2073 VIRTIO_NET_F_GUEST_UFO, true),
2074 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features,
2075 VIRTIO_NET_F_GUEST_ANNOUNCE, true),
2076 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features,
2077 VIRTIO_NET_F_HOST_TSO4, true),
2078 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features,
2079 VIRTIO_NET_F_HOST_TSO6, true),
2080 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features,
2081 VIRTIO_NET_F_HOST_ECN, true),
2082 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features,
2083 VIRTIO_NET_F_HOST_UFO, true),
2084 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features,
2085 VIRTIO_NET_F_MRG_RXBUF, true),
2086 DEFINE_PROP_BIT("status", VirtIONet, host_features,
2087 VIRTIO_NET_F_STATUS, true),
2088 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features,
2089 VIRTIO_NET_F_CTRL_VQ, true),
2090 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features,
2091 VIRTIO_NET_F_CTRL_RX, true),
2092 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features,
2093 VIRTIO_NET_F_CTRL_VLAN, true),
2094 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features,
2095 VIRTIO_NET_F_CTRL_RX_EXTRA, true),
2096 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features,
2097 VIRTIO_NET_F_CTRL_MAC_ADDR, true),
2098 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features,
2099 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
2100 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
2101 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
2102 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
2103 TX_TIMER_INTERVAL),
2104 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
2105 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
2106 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
2107 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
2108 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
2109 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
2110 true),
2111 DEFINE_PROP_END_OF_LIST(),
2112 };
2113
2114 static void virtio_net_class_init(ObjectClass *klass, void *data)
2115 {
2116 DeviceClass *dc = DEVICE_CLASS(klass);
2117 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
2118
2119 dc->props = virtio_net_properties;
2120 dc->vmsd = &vmstate_virtio_net;
2121 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
2122 vdc->realize = virtio_net_device_realize;
2123 vdc->unrealize = virtio_net_device_unrealize;
2124 vdc->get_config = virtio_net_get_config;
2125 vdc->set_config = virtio_net_set_config;
2126 vdc->get_features = virtio_net_get_features;
2127 vdc->set_features = virtio_net_set_features;
2128 vdc->bad_features = virtio_net_bad_features;
2129 vdc->reset = virtio_net_reset;
2130 vdc->set_status = virtio_net_set_status;
2131 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
2132 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
2133 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
2134 vdc->vmsd = &vmstate_virtio_net_device;
2135 }
2136
2137 static const TypeInfo virtio_net_info = {
2138 .name = TYPE_VIRTIO_NET,
2139 .parent = TYPE_VIRTIO_DEVICE,
2140 .instance_size = sizeof(VirtIONet),
2141 .instance_init = virtio_net_instance_init,
2142 .class_init = virtio_net_class_init,
2143 };
2144
2145 static void virtio_register_types(void)
2146 {
2147 type_register_static(&virtio_net_info);
2148 }
2149
2150 type_init(virtio_register_types)
AR7 emulation for QEMU