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virtio-net: add linkspeed and duplex settings to virtio-net
[qemu/ar7.git] / hw / net / virtio-net.c
blob67ad38cfe4faa9e0b3620eed3e51ed970f6a6256
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/error.h"
26 #include "qapi/qapi-events-net.h"
27 #include "hw/virtio/virtio-access.h"
28 #include "migration/misc.h"
29 #include "standard-headers/linux/ethtool.h"
30
31 #define VIRTIO_NET_VM_VERSION 11
32
33 #define MAC_TABLE_ENTRIES 64
34 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
35
36 /* previously fixed value */
37 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
38 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256
39
40 /* for now, only allow larger queues; with virtio-1, guest can downsize */
41 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
42 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
43
44 /*
45 * Calculate the number of bytes up to and including the given 'field' of
46 * 'container'.
47 */
48 #define endof(container, field) \
49 (offsetof(container, field) + sizeof(((container *)0)->field))
50
51 typedef struct VirtIOFeature {
52 uint64_t flags;
53 size_t end;
54 } VirtIOFeature;
55
56 static VirtIOFeature feature_sizes[] = {
57 {.flags = 1ULL << VIRTIO_NET_F_MAC,
58 .end = endof(struct virtio_net_config, mac)},
59 {.flags = 1ULL << VIRTIO_NET_F_STATUS,
60 .end = endof(struct virtio_net_config, status)},
61 {.flags = 1ULL << VIRTIO_NET_F_MQ,
62 .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
63 {.flags = 1ULL << VIRTIO_NET_F_MTU,
64 .end = endof(struct virtio_net_config, mtu)},
65 {.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX,
66 .end = endof(struct virtio_net_config, duplex)},
67 {}
68 };
69
70 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
71 {
72 VirtIONet *n = qemu_get_nic_opaque(nc);
73
74 return &n->vqs[nc->queue_index];
75 }
76
77 static int vq2q(int queue_index)
78 {
79 return queue_index / 2;
80 }
81
82 /* TODO
83 * - we could suppress RX interrupt if we were so inclined.
84 */
85
86 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
87 {
88 VirtIONet *n = VIRTIO_NET(vdev);
89 struct virtio_net_config netcfg;
90
91 virtio_stw_p(vdev, &netcfg.status, n->status);
92 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
93 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
94 memcpy(netcfg.mac, n->mac, ETH_ALEN);
95 virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
96 netcfg.duplex = n->net_conf.duplex;
97 memcpy(config, &netcfg, n->config_size);
98 }
99
100 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
101 {
102 VirtIONet *n = VIRTIO_NET(vdev);
103 struct virtio_net_config netcfg = {};
104
105 memcpy(&netcfg, config, n->config_size);
106
107 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
108 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
109 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
110 memcpy(n->mac, netcfg.mac, ETH_ALEN);
111 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
112 }
113 }
114
115 static bool virtio_net_started(VirtIONet *n, uint8_t status)
116 {
117 VirtIODevice *vdev = VIRTIO_DEVICE(n);
118 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
119 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
120 }
121
122 static void virtio_net_announce_timer(void *opaque)
123 {
124 VirtIONet *n = opaque;
125 VirtIODevice *vdev = VIRTIO_DEVICE(n);
126
127 n->announce_counter--;
128 n->status |= VIRTIO_NET_S_ANNOUNCE;
129 virtio_notify_config(vdev);
130 }
131
132 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
133 {
134 VirtIODevice *vdev = VIRTIO_DEVICE(n);
135 NetClientState *nc = qemu_get_queue(n->nic);
136 int queues = n->multiqueue ? n->max_queues : 1;
137
138 if (!get_vhost_net(nc->peer)) {
139 return;
140 }
141
142 if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
143 !!n->vhost_started) {
144 return;
145 }
146 if (!n->vhost_started) {
147 int r, i;
148
149 if (n->needs_vnet_hdr_swap) {
150 error_report("backend does not support %s vnet headers; "
151 "falling back on userspace virtio",
152 virtio_is_big_endian(vdev) ? "BE" : "LE");
153 return;
154 }
155
156 /* Any packets outstanding? Purge them to avoid touching rings
157 * when vhost is running.
158 */
159 for (i = 0; i < queues; i++) {
160 NetClientState *qnc = qemu_get_subqueue(n->nic, i);
161
162 /* Purge both directions: TX and RX. */
163 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
164 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
165 }
166
167 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) {
168 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu);
169 if (r < 0) {
170 error_report("%uBytes MTU not supported by the backend",
171 n->net_conf.mtu);
172
173 return;
174 }
175 }
176
177 n->vhost_started = 1;
178 r = vhost_net_start(vdev, n->nic->ncs, queues);
179 if (r < 0) {
180 error_report("unable to start vhost net: %d: "
181 "falling back on userspace virtio", -r);
182 n->vhost_started = 0;
183 }
184 } else {
185 vhost_net_stop(vdev, n->nic->ncs, queues);
186 n->vhost_started = 0;
187 }
188 }
189
190 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev,
191 NetClientState *peer,
192 bool enable)
193 {
194 if (virtio_is_big_endian(vdev)) {
195 return qemu_set_vnet_be(peer, enable);
196 } else {
197 return qemu_set_vnet_le(peer, enable);
198 }
199 }
200
201 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs,
202 int queues, bool enable)
203 {
204 int i;
205
206 for (i = 0; i < queues; i++) {
207 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 &&
208 enable) {
209 while (--i >= 0) {
210 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false);
211 }
212
213 return true;
214 }
215 }
216
217 return false;
218 }
219
220 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status)
221 {
222 VirtIODevice *vdev = VIRTIO_DEVICE(n);
223 int queues = n->multiqueue ? n->max_queues : 1;
224
225 if (virtio_net_started(n, status)) {
226 /* Before using the device, we tell the network backend about the
227 * endianness to use when parsing vnet headers. If the backend
228 * can't do it, we fallback onto fixing the headers in the core
229 * virtio-net code.
230 */
231 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs,
232 queues, true);
233 } else if (virtio_net_started(n, vdev->status)) {
234 /* After using the device, we need to reset the network backend to
235 * the default (guest native endianness), otherwise the guest may
236 * lose network connectivity if it is rebooted into a different
237 * endianness.
238 */
239 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false);
240 }
241 }
242
243 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq)
244 {
245 unsigned int dropped = virtqueue_drop_all(vq);
246 if (dropped) {
247 virtio_notify(vdev, vq);
248 }
249 }
250
251 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
252 {
253 VirtIONet *n = VIRTIO_NET(vdev);
254 VirtIONetQueue *q;
255 int i;
256 uint8_t queue_status;
257
258 virtio_net_vnet_endian_status(n, status);
259 virtio_net_vhost_status(n, status);
260
261 for (i = 0; i < n->max_queues; i++) {
262 NetClientState *ncs = qemu_get_subqueue(n->nic, i);
263 bool queue_started;
264 q = &n->vqs[i];
265
266 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
267 queue_status = 0;
268 } else {
269 queue_status = status;
270 }
271 queue_started =
272 virtio_net_started(n, queue_status) && !n->vhost_started;
273
274 if (queue_started) {
275 qemu_flush_queued_packets(ncs);
276 }
277
278 if (!q->tx_waiting) {
279 continue;
280 }
281
282 if (queue_started) {
283 if (q->tx_timer) {
284 timer_mod(q->tx_timer,
285 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
286 } else {
287 qemu_bh_schedule(q->tx_bh);
288 }
289 } else {
290 if (q->tx_timer) {
291 timer_del(q->tx_timer);
292 } else {
293 qemu_bh_cancel(q->tx_bh);
294 }
295 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
296 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) &&
297 vdev->vm_running) {
298 /* if tx is waiting we are likely have some packets in tx queue
299 * and disabled notification */
300 q->tx_waiting = 0;
301 virtio_queue_set_notification(q->tx_vq, 1);
302 virtio_net_drop_tx_queue_data(vdev, q->tx_vq);
303 }
304 }
305 }
306 }
307
308 static void virtio_net_set_link_status(NetClientState *nc)
309 {
310 VirtIONet *n = qemu_get_nic_opaque(nc);
311 VirtIODevice *vdev = VIRTIO_DEVICE(n);
312 uint16_t old_status = n->status;
313
314 if (nc->link_down)
315 n->status &= ~VIRTIO_NET_S_LINK_UP;
316 else
317 n->status |= VIRTIO_NET_S_LINK_UP;
318
319 if (n->status != old_status)
320 virtio_notify_config(vdev);
321
322 virtio_net_set_status(vdev, vdev->status);
323 }
324
325 static void rxfilter_notify(NetClientState *nc)
326 {
327 VirtIONet *n = qemu_get_nic_opaque(nc);
328
329 if (nc->rxfilter_notify_enabled) {
330 gchar *path = object_get_canonical_path(OBJECT(n->qdev));
331 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
332 n->netclient_name, path, &error_abort);
333 g_free(path);
334
335 /* disable event notification to avoid events flooding */
336 nc->rxfilter_notify_enabled = 0;
337 }
338 }
339
340 static intList *get_vlan_table(VirtIONet *n)
341 {
342 intList *list, *entry;
343 int i, j;
344
345 list = NULL;
346 for (i = 0; i < MAX_VLAN >> 5; i++) {
347 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
348 if (n->vlans[i] & (1U << j)) {
349 entry = g_malloc0(sizeof(*entry));
350 entry->value = (i << 5) + j;
351 entry->next = list;
352 list = entry;
353 }
354 }
355 }
356
357 return list;
358 }
359
360 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
361 {
362 VirtIONet *n = qemu_get_nic_opaque(nc);
363 VirtIODevice *vdev = VIRTIO_DEVICE(n);
364 RxFilterInfo *info;
365 strList *str_list, *entry;
366 int i;
367
368 info = g_malloc0(sizeof(*info));
369 info->name = g_strdup(nc->name);
370 info->promiscuous = n->promisc;
371
372 if (n->nouni) {
373 info->unicast = RX_STATE_NONE;
374 } else if (n->alluni) {
375 info->unicast = RX_STATE_ALL;
376 } else {
377 info->unicast = RX_STATE_NORMAL;
378 }
379
380 if (n->nomulti) {
381 info->multicast = RX_STATE_NONE;
382 } else if (n->allmulti) {
383 info->multicast = RX_STATE_ALL;
384 } else {
385 info->multicast = RX_STATE_NORMAL;
386 }
387
388 info->broadcast_allowed = n->nobcast;
389 info->multicast_overflow = n->mac_table.multi_overflow;
390 info->unicast_overflow = n->mac_table.uni_overflow;
391
392 info->main_mac = qemu_mac_strdup_printf(n->mac);
393
394 str_list = NULL;
395 for (i = 0; i < n->mac_table.first_multi; i++) {
396 entry = g_malloc0(sizeof(*entry));
397 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
398 entry->next = str_list;
399 str_list = entry;
400 }
401 info->unicast_table = str_list;
402
403 str_list = NULL;
404 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
405 entry = g_malloc0(sizeof(*entry));
406 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
407 entry->next = str_list;
408 str_list = entry;
409 }
410 info->multicast_table = str_list;
411 info->vlan_table = get_vlan_table(n);
412
413 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
414 info->vlan = RX_STATE_ALL;
415 } else if (!info->vlan_table) {
416 info->vlan = RX_STATE_NONE;
417 } else {
418 info->vlan = RX_STATE_NORMAL;
419 }
420
421 /* enable event notification after query */
422 nc->rxfilter_notify_enabled = 1;
423
424 return info;
425 }
426
427 static void virtio_net_reset(VirtIODevice *vdev)
428 {
429 VirtIONet *n = VIRTIO_NET(vdev);
430
431 /* Reset back to compatibility mode */
432 n->promisc = 1;
433 n->allmulti = 0;
434 n->alluni = 0;
435 n->nomulti = 0;
436 n->nouni = 0;
437 n->nobcast = 0;
438 /* multiqueue is disabled by default */
439 n->curr_queues = 1;
440 timer_del(n->announce_timer);
441 n->announce_counter = 0;
442 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
443
444 /* Flush any MAC and VLAN filter table state */
445 n->mac_table.in_use = 0;
446 n->mac_table.first_multi = 0;
447 n->mac_table.multi_overflow = 0;
448 n->mac_table.uni_overflow = 0;
449 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
450 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
451 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
452 memset(n->vlans, 0, MAX_VLAN >> 3);
453 }
454
455 static void peer_test_vnet_hdr(VirtIONet *n)
456 {
457 NetClientState *nc = qemu_get_queue(n->nic);
458 if (!nc->peer) {
459 return;
460 }
461
462 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
463 }
464
465 static int peer_has_vnet_hdr(VirtIONet *n)
466 {
467 return n->has_vnet_hdr;
468 }
469
470 static int peer_has_ufo(VirtIONet *n)
471 {
472 if (!peer_has_vnet_hdr(n))
473 return 0;
474
475 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
476
477 return n->has_ufo;
478 }
479
480 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
481 int version_1)
482 {
483 int i;
484 NetClientState *nc;
485
486 n->mergeable_rx_bufs = mergeable_rx_bufs;
487
488 if (version_1) {
489 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
490 } else {
491 n->guest_hdr_len = n->mergeable_rx_bufs ?
492 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
493 sizeof(struct virtio_net_hdr);
494 }
495
496 for (i = 0; i < n->max_queues; i++) {
497 nc = qemu_get_subqueue(n->nic, i);
498
499 if (peer_has_vnet_hdr(n) &&
500 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
501 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
502 n->host_hdr_len = n->guest_hdr_len;
503 }
504 }
505 }
506
507 static int virtio_net_max_tx_queue_size(VirtIONet *n)
508 {
509 NetClientState *peer = n->nic_conf.peers.ncs[0];
510
511 /*
512 * Backends other than vhost-user don't support max queue size.
513 */
514 if (!peer) {
515 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
516 }
517
518 if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
519 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
520 }
521
522 return VIRTQUEUE_MAX_SIZE;
523 }
524
525 static int peer_attach(VirtIONet *n, int index)
526 {
527 NetClientState *nc = qemu_get_subqueue(n->nic, index);
528
529 if (!nc->peer) {
530 return 0;
531 }
532
533 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
534 vhost_set_vring_enable(nc->peer, 1);
535 }
536
537 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
538 return 0;
539 }
540
541 if (n->max_queues == 1) {
542 return 0;
543 }
544
545 return tap_enable(nc->peer);
546 }
547
548 static int peer_detach(VirtIONet *n, int index)
549 {
550 NetClientState *nc = qemu_get_subqueue(n->nic, index);
551
552 if (!nc->peer) {
553 return 0;
554 }
555
556 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
557 vhost_set_vring_enable(nc->peer, 0);
558 }
559
560 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
561 return 0;
562 }
563
564 return tap_disable(nc->peer);
565 }
566
567 static void virtio_net_set_queues(VirtIONet *n)
568 {
569 int i;
570 int r;
571
572 if (n->nic->peer_deleted) {
573 return;
574 }
575
576 for (i = 0; i < n->max_queues; i++) {
577 if (i < n->curr_queues) {
578 r = peer_attach(n, i);
579 assert(!r);
580 } else {
581 r = peer_detach(n, i);
582 assert(!r);
583 }
584 }
585 }
586
587 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
588
589 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
590 Error **errp)
591 {
592 VirtIONet *n = VIRTIO_NET(vdev);
593 NetClientState *nc = qemu_get_queue(n->nic);
594
595 /* Firstly sync all virtio-net possible supported features */
596 features |= n->host_features;
597
598 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
599
600 if (!peer_has_vnet_hdr(n)) {
601 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
602 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
603 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
604 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
605
606 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
607 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
608 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
609 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
610 }
611
612 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
613 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
614 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
615 }
616
617 if (!get_vhost_net(nc->peer)) {
618 return features;
619 }
620 features = vhost_net_get_features(get_vhost_net(nc->peer), features);
621 vdev->backend_features = features;
622
623 if (n->mtu_bypass_backend &&
624 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
625 features |= (1ULL << VIRTIO_NET_F_MTU);
626 }
627
628 return features;
629 }
630
631 static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
632 {
633 uint64_t features = 0;
634
635 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
636 * but also these: */
637 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
638 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
639 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
640 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
641 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
642
643 return features;
644 }
645
646 static void virtio_net_apply_guest_offloads(VirtIONet *n)
647 {
648 qemu_set_offload(qemu_get_queue(n->nic)->peer,
649 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
650 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
651 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
652 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
653 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
654 }
655
656 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
657 {
658 static const uint64_t guest_offloads_mask =
659 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
660 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
661 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
662 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
663 (1ULL << VIRTIO_NET_F_GUEST_UFO);
664
665 return guest_offloads_mask & features;
666 }
667
668 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
669 {
670 VirtIODevice *vdev = VIRTIO_DEVICE(n);
671 return virtio_net_guest_offloads_by_features(vdev->guest_features);
672 }
673
674 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
675 {
676 VirtIONet *n = VIRTIO_NET(vdev);
677 int i;
678
679 if (n->mtu_bypass_backend &&
680 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) {
681 features &= ~(1ULL << VIRTIO_NET_F_MTU);
682 }
683
684 virtio_net_set_multiqueue(n,
685 virtio_has_feature(features, VIRTIO_NET_F_MQ));
686
687 virtio_net_set_mrg_rx_bufs(n,
688 virtio_has_feature(features,
689 VIRTIO_NET_F_MRG_RXBUF),
690 virtio_has_feature(features,
691 VIRTIO_F_VERSION_1));
692
693 if (n->has_vnet_hdr) {
694 n->curr_guest_offloads =
695 virtio_net_guest_offloads_by_features(features);
696 virtio_net_apply_guest_offloads(n);
697 }
698
699 for (i = 0; i < n->max_queues; i++) {
700 NetClientState *nc = qemu_get_subqueue(n->nic, i);
701
702 if (!get_vhost_net(nc->peer)) {
703 continue;
704 }
705 vhost_net_ack_features(get_vhost_net(nc->peer), features);
706 }
707
708 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
709 memset(n->vlans, 0, MAX_VLAN >> 3);
710 } else {
711 memset(n->vlans, 0xff, MAX_VLAN >> 3);
712 }
713 }
714
715 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
716 struct iovec *iov, unsigned int iov_cnt)
717 {
718 uint8_t on;
719 size_t s;
720 NetClientState *nc = qemu_get_queue(n->nic);
721
722 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
723 if (s != sizeof(on)) {
724 return VIRTIO_NET_ERR;
725 }
726
727 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
728 n->promisc = on;
729 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
730 n->allmulti = on;
731 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
732 n->alluni = on;
733 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
734 n->nomulti = on;
735 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
736 n->nouni = on;
737 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
738 n->nobcast = on;
739 } else {
740 return VIRTIO_NET_ERR;
741 }
742
743 rxfilter_notify(nc);
744
745 return VIRTIO_NET_OK;
746 }
747
748 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
749 struct iovec *iov, unsigned int iov_cnt)
750 {
751 VirtIODevice *vdev = VIRTIO_DEVICE(n);
752 uint64_t offloads;
753 size_t s;
754
755 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
756 return VIRTIO_NET_ERR;
757 }
758
759 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
760 if (s != sizeof(offloads)) {
761 return VIRTIO_NET_ERR;
762 }
763
764 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
765 uint64_t supported_offloads;
766
767 offloads = virtio_ldq_p(vdev, &offloads);
768
769 if (!n->has_vnet_hdr) {
770 return VIRTIO_NET_ERR;
771 }
772
773 supported_offloads = virtio_net_supported_guest_offloads(n);
774 if (offloads & ~supported_offloads) {
775 return VIRTIO_NET_ERR;
776 }
777
778 n->curr_guest_offloads = offloads;
779 virtio_net_apply_guest_offloads(n);
780
781 return VIRTIO_NET_OK;
782 } else {
783 return VIRTIO_NET_ERR;
784 }
785 }
786
787 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
788 struct iovec *iov, unsigned int iov_cnt)
789 {
790 VirtIODevice *vdev = VIRTIO_DEVICE(n);
791 struct virtio_net_ctrl_mac mac_data;
792 size_t s;
793 NetClientState *nc = qemu_get_queue(n->nic);
794
795 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
796 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
797 return VIRTIO_NET_ERR;
798 }
799 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
800 assert(s == sizeof(n->mac));
801 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
802 rxfilter_notify(nc);
803
804 return VIRTIO_NET_OK;
805 }
806
807 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
808 return VIRTIO_NET_ERR;
809 }
810
811 int in_use = 0;
812 int first_multi = 0;
813 uint8_t uni_overflow = 0;
814 uint8_t multi_overflow = 0;
815 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
816
817 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
818 sizeof(mac_data.entries));
819 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
820 if (s != sizeof(mac_data.entries)) {
821 goto error;
822 }
823 iov_discard_front(&iov, &iov_cnt, s);
824
825 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
826 goto error;
827 }
828
829 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
830 s = iov_to_buf(iov, iov_cnt, 0, macs,
831 mac_data.entries * ETH_ALEN);
832 if (s != mac_data.entries * ETH_ALEN) {
833 goto error;
834 }
835 in_use += mac_data.entries;
836 } else {
837 uni_overflow = 1;
838 }
839
840 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
841
842 first_multi = in_use;
843
844 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
845 sizeof(mac_data.entries));
846 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
847 if (s != sizeof(mac_data.entries)) {
848 goto error;
849 }
850
851 iov_discard_front(&iov, &iov_cnt, s);
852
853 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
854 goto error;
855 }
856
857 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
858 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
859 mac_data.entries * ETH_ALEN);
860 if (s != mac_data.entries * ETH_ALEN) {
861 goto error;
862 }
863 in_use += mac_data.entries;
864 } else {
865 multi_overflow = 1;
866 }
867
868 n->mac_table.in_use = in_use;
869 n->mac_table.first_multi = first_multi;
870 n->mac_table.uni_overflow = uni_overflow;
871 n->mac_table.multi_overflow = multi_overflow;
872 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
873 g_free(macs);
874 rxfilter_notify(nc);
875
876 return VIRTIO_NET_OK;
877
878 error:
879 g_free(macs);
880 return VIRTIO_NET_ERR;
881 }
882
883 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
884 struct iovec *iov, unsigned int iov_cnt)
885 {
886 VirtIODevice *vdev = VIRTIO_DEVICE(n);
887 uint16_t vid;
888 size_t s;
889 NetClientState *nc = qemu_get_queue(n->nic);
890
891 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
892 vid = virtio_lduw_p(vdev, &vid);
893 if (s != sizeof(vid)) {
894 return VIRTIO_NET_ERR;
895 }
896
897 if (vid >= MAX_VLAN)
898 return VIRTIO_NET_ERR;
899
900 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
901 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
902 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
903 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
904 else
905 return VIRTIO_NET_ERR;
906
907 rxfilter_notify(nc);
908
909 return VIRTIO_NET_OK;
910 }
911
912 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
913 struct iovec *iov, unsigned int iov_cnt)
914 {
915 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
916 n->status & VIRTIO_NET_S_ANNOUNCE) {
917 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
918 if (n->announce_counter) {
919 timer_mod(n->announce_timer,
920 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
921 self_announce_delay(n->announce_counter));
922 }
923 return VIRTIO_NET_OK;
924 } else {
925 return VIRTIO_NET_ERR;
926 }
927 }
928
929 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
930 struct iovec *iov, unsigned int iov_cnt)
931 {
932 VirtIODevice *vdev = VIRTIO_DEVICE(n);
933 struct virtio_net_ctrl_mq mq;
934 size_t s;
935 uint16_t queues;
936
937 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
938 if (s != sizeof(mq)) {
939 return VIRTIO_NET_ERR;
940 }
941
942 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
943 return VIRTIO_NET_ERR;
944 }
945
946 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
947
948 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
949 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
950 queues > n->max_queues ||
951 !n->multiqueue) {
952 return VIRTIO_NET_ERR;
953 }
954
955 n->curr_queues = queues;
956 /* stop the backend before changing the number of queues to avoid handling a
957 * disabled queue */
958 virtio_net_set_status(vdev, vdev->status);
959 virtio_net_set_queues(n);
960
961 return VIRTIO_NET_OK;
962 }
963
964 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
965 {
966 VirtIONet *n = VIRTIO_NET(vdev);
967 struct virtio_net_ctrl_hdr ctrl;
968 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
969 VirtQueueElement *elem;
970 size_t s;
971 struct iovec *iov, *iov2;
972 unsigned int iov_cnt;
973
974 for (;;) {
975 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
976 if (!elem) {
977 break;
978 }
979 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) ||
980 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) {
981 virtio_error(vdev, "virtio-net ctrl missing headers");
982 virtqueue_detach_element(vq, elem, 0);
983 g_free(elem);
984 break;
985 }
986
987 iov_cnt = elem->out_num;
988 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num);
989 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
990 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
991 if (s != sizeof(ctrl)) {
992 status = VIRTIO_NET_ERR;
993 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
994 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
995 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
996 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
997 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
998 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
999 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
1000 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
1001 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
1002 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
1003 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
1004 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
1005 }
1006
1007 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status));
1008 assert(s == sizeof(status));
1009
1010 virtqueue_push(vq, elem, sizeof(status));
1011 virtio_notify(vdev, vq);
1012 g_free(iov2);
1013 g_free(elem);
1014 }
1015 }
1016
1017 /* RX */
1018
1019 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
1020 {
1021 VirtIONet *n = VIRTIO_NET(vdev);
1022 int queue_index = vq2q(virtio_get_queue_index(vq));
1023
1024 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
1025 }
1026
1027 static int virtio_net_can_receive(NetClientState *nc)
1028 {
1029 VirtIONet *n = qemu_get_nic_opaque(nc);
1030 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1031 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1032
1033 if (!vdev->vm_running) {
1034 return 0;
1035 }
1036
1037 if (nc->queue_index >= n->curr_queues) {
1038 return 0;
1039 }
1040
1041 if (!virtio_queue_ready(q->rx_vq) ||
1042 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1043 return 0;
1044 }
1045
1046 return 1;
1047 }
1048
1049 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
1050 {
1051 VirtIONet *n = q->n;
1052 if (virtio_queue_empty(q->rx_vq) ||
1053 (n->mergeable_rx_bufs &&
1054 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1055 virtio_queue_set_notification(q->rx_vq, 1);
1056
1057 /* To avoid a race condition where the guest has made some buffers
1058 * available after the above check but before notification was
1059 * enabled, check for available buffers again.
1060 */
1061 if (virtio_queue_empty(q->rx_vq) ||
1062 (n->mergeable_rx_bufs &&
1063 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1064 return 0;
1065 }
1066 }
1067
1068 virtio_queue_set_notification(q->rx_vq, 0);
1069 return 1;
1070 }
1071
1072 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
1073 {
1074 virtio_tswap16s(vdev, &hdr->hdr_len);
1075 virtio_tswap16s(vdev, &hdr->gso_size);
1076 virtio_tswap16s(vdev, &hdr->csum_start);
1077 virtio_tswap16s(vdev, &hdr->csum_offset);
1078 }
1079
1080 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
1081 * it never finds out that the packets don't have valid checksums. This
1082 * causes dhclient to get upset. Fedora's carried a patch for ages to
1083 * fix this with Xen but it hasn't appeared in an upstream release of
1084 * dhclient yet.
1085 *
1086 * To avoid breaking existing guests, we catch udp packets and add
1087 * checksums. This is terrible but it's better than hacking the guest
1088 * kernels.
1089 *
1090 * N.B. if we introduce a zero-copy API, this operation is no longer free so
1091 * we should provide a mechanism to disable it to avoid polluting the host
1092 * cache.
1093 */
1094 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
1095 uint8_t *buf, size_t size)
1096 {
1097 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
1098 (size > 27 && size < 1500) && /* normal sized MTU */
1099 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
1100 (buf[23] == 17) && /* ip.protocol == UDP */
1101 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
1102 net_checksum_calculate(buf, size);
1103 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
1104 }
1105 }
1106
1107 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
1108 const void *buf, size_t size)
1109 {
1110 if (n->has_vnet_hdr) {
1111 /* FIXME this cast is evil */
1112 void *wbuf = (void *)buf;
1113 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
1114 size - n->host_hdr_len);
1115
1116 if (n->needs_vnet_hdr_swap) {
1117 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
1118 }
1119 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
1120 } else {
1121 struct virtio_net_hdr hdr = {
1122 .flags = 0,
1123 .gso_type = VIRTIO_NET_HDR_GSO_NONE
1124 };
1125 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
1126 }
1127 }
1128
1129 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
1130 {
1131 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1132 static const uint8_t vlan[] = {0x81, 0x00};
1133 uint8_t *ptr = (uint8_t *)buf;
1134 int i;
1135
1136 if (n->promisc)
1137 return 1;
1138
1139 ptr += n->host_hdr_len;
1140
1141 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
1142 int vid = lduw_be_p(ptr + 14) & 0xfff;
1143 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
1144 return 0;
1145 }
1146
1147 if (ptr[0] & 1) { // multicast
1148 if (!memcmp(ptr, bcast, sizeof(bcast))) {
1149 return !n->nobcast;
1150 } else if (n->nomulti) {
1151 return 0;
1152 } else if (n->allmulti || n->mac_table.multi_overflow) {
1153 return 1;
1154 }
1155
1156 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
1157 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1158 return 1;
1159 }
1160 }
1161 } else { // unicast
1162 if (n->nouni) {
1163 return 0;
1164 } else if (n->alluni || n->mac_table.uni_overflow) {
1165 return 1;
1166 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
1167 return 1;
1168 }
1169
1170 for (i = 0; i < n->mac_table.first_multi; i++) {
1171 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1172 return 1;
1173 }
1174 }
1175 }
1176
1177 return 0;
1178 }
1179
1180 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
1181 size_t size)
1182 {
1183 VirtIONet *n = qemu_get_nic_opaque(nc);
1184 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1185 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1186 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1187 struct virtio_net_hdr_mrg_rxbuf mhdr;
1188 unsigned mhdr_cnt = 0;
1189 size_t offset, i, guest_offset;
1190
1191 if (!virtio_net_can_receive(nc)) {
1192 return -1;
1193 }
1194
1195 /* hdr_len refers to the header we supply to the guest */
1196 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1197 return 0;
1198 }
1199
1200 if (!receive_filter(n, buf, size))
1201 return size;
1202
1203 offset = i = 0;
1204
1205 while (offset < size) {
1206 VirtQueueElement *elem;
1207 int len, total;
1208 const struct iovec *sg;
1209
1210 total = 0;
1211
1212 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
1213 if (!elem) {
1214 if (i) {
1215 virtio_error(vdev, "virtio-net unexpected empty queue: "
1216 "i %zd mergeable %d offset %zd, size %zd, "
1217 "guest hdr len %zd, host hdr len %zd "
1218 "guest features 0x%" PRIx64,
1219 i, n->mergeable_rx_bufs, offset, size,
1220 n->guest_hdr_len, n->host_hdr_len,
1221 vdev->guest_features);
1222 }
1223 return -1;
1224 }
1225
1226 if (elem->in_num < 1) {
1227 virtio_error(vdev,
1228 "virtio-net receive queue contains no in buffers");
1229 virtqueue_detach_element(q->rx_vq, elem, 0);
1230 g_free(elem);
1231 return -1;
1232 }
1233
1234 sg = elem->in_sg;
1235 if (i == 0) {
1236 assert(offset == 0);
1237 if (n->mergeable_rx_bufs) {
1238 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1239 sg, elem->in_num,
1240 offsetof(typeof(mhdr), num_buffers),
1241 sizeof(mhdr.num_buffers));
1242 }
1243
1244 receive_header(n, sg, elem->in_num, buf, size);
1245 offset = n->host_hdr_len;
1246 total += n->guest_hdr_len;
1247 guest_offset = n->guest_hdr_len;
1248 } else {
1249 guest_offset = 0;
1250 }
1251
1252 /* copy in packet. ugh */
1253 len = iov_from_buf(sg, elem->in_num, guest_offset,
1254 buf + offset, size - offset);
1255 total += len;
1256 offset += len;
1257 /* If buffers can't be merged, at this point we
1258 * must have consumed the complete packet.
1259 * Otherwise, drop it. */
1260 if (!n->mergeable_rx_bufs && offset < size) {
1261 virtqueue_unpop(q->rx_vq, elem, total);
1262 g_free(elem);
1263 return size;
1264 }
1265
1266 /* signal other side */
1267 virtqueue_fill(q->rx_vq, elem, total, i++);
1268 g_free(elem);
1269 }
1270
1271 if (mhdr_cnt) {
1272 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1273 iov_from_buf(mhdr_sg, mhdr_cnt,
1274 0,
1275 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1276 }
1277
1278 virtqueue_flush(q->rx_vq, i);
1279 virtio_notify(vdev, q->rx_vq);
1280
1281 return size;
1282 }
1283
1284 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
1285 size_t size)
1286 {
1287 ssize_t r;
1288
1289 rcu_read_lock();
1290 r = virtio_net_receive_rcu(nc, buf, size);
1291 rcu_read_unlock();
1292 return r;
1293 }
1294
1295 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1296
1297 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1298 {
1299 VirtIONet *n = qemu_get_nic_opaque(nc);
1300 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1301 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1302
1303 virtqueue_push(q->tx_vq, q->async_tx.elem, 0);
1304 virtio_notify(vdev, q->tx_vq);
1305
1306 g_free(q->async_tx.elem);
1307 q->async_tx.elem = NULL;
1308
1309 virtio_queue_set_notification(q->tx_vq, 1);
1310 virtio_net_flush_tx(q);
1311 }
1312
1313 /* TX */
1314 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1315 {
1316 VirtIONet *n = q->n;
1317 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1318 VirtQueueElement *elem;
1319 int32_t num_packets = 0;
1320 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1321 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1322 return num_packets;
1323 }
1324
1325 if (q->async_tx.elem) {
1326 virtio_queue_set_notification(q->tx_vq, 0);
1327 return num_packets;
1328 }
1329
1330 for (;;) {
1331 ssize_t ret;
1332 unsigned int out_num;
1333 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
1334 struct virtio_net_hdr_mrg_rxbuf mhdr;
1335
1336 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
1337 if (!elem) {
1338 break;
1339 }
1340
1341 out_num = elem->out_num;
1342 out_sg = elem->out_sg;
1343 if (out_num < 1) {
1344 virtio_error(vdev, "virtio-net header not in first element");
1345 virtqueue_detach_element(q->tx_vq, elem, 0);
1346 g_free(elem);
1347 return -EINVAL;
1348 }
1349
1350 if (n->has_vnet_hdr) {
1351 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
1352 n->guest_hdr_len) {
1353 virtio_error(vdev, "virtio-net header incorrect");
1354 virtqueue_detach_element(q->tx_vq, elem, 0);
1355 g_free(elem);
1356 return -EINVAL;
1357 }
1358 if (n->needs_vnet_hdr_swap) {
1359 virtio_net_hdr_swap(vdev, (void *) &mhdr);
1360 sg2[0].iov_base = &mhdr;
1361 sg2[0].iov_len = n->guest_hdr_len;
1362 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
1363 out_sg, out_num,
1364 n->guest_hdr_len, -1);
1365 if (out_num == VIRTQUEUE_MAX_SIZE) {
1366 goto drop;
1367 }
1368 out_num += 1;
1369 out_sg = sg2;
1370 }
1371 }
1372 /*
1373 * If host wants to see the guest header as is, we can
1374 * pass it on unchanged. Otherwise, copy just the parts
1375 * that host is interested in.
1376 */
1377 assert(n->host_hdr_len <= n->guest_hdr_len);
1378 if (n->host_hdr_len != n->guest_hdr_len) {
1379 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1380 out_sg, out_num,
1381 0, n->host_hdr_len);
1382 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1383 out_sg, out_num,
1384 n->guest_hdr_len, -1);
1385 out_num = sg_num;
1386 out_sg = sg;
1387 }
1388
1389 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1390 out_sg, out_num, virtio_net_tx_complete);
1391 if (ret == 0) {
1392 virtio_queue_set_notification(q->tx_vq, 0);
1393 q->async_tx.elem = elem;
1394 return -EBUSY;
1395 }
1396
1397 drop:
1398 virtqueue_push(q->tx_vq, elem, 0);
1399 virtio_notify(vdev, q->tx_vq);
1400 g_free(elem);
1401
1402 if (++num_packets >= n->tx_burst) {
1403 break;
1404 }
1405 }
1406 return num_packets;
1407 }
1408
1409 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1410 {
1411 VirtIONet *n = VIRTIO_NET(vdev);
1412 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1413
1414 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
1415 virtio_net_drop_tx_queue_data(vdev, vq);
1416 return;
1417 }
1418
1419 /* This happens when device was stopped but VCPU wasn't. */
1420 if (!vdev->vm_running) {
1421 q->tx_waiting = 1;
1422 return;
1423 }
1424
1425 if (q->tx_waiting) {
1426 virtio_queue_set_notification(vq, 1);
1427 timer_del(q->tx_timer);
1428 q->tx_waiting = 0;
1429 if (virtio_net_flush_tx(q) == -EINVAL) {
1430 return;
1431 }
1432 } else {
1433 timer_mod(q->tx_timer,
1434 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1435 q->tx_waiting = 1;
1436 virtio_queue_set_notification(vq, 0);
1437 }
1438 }
1439
1440 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1441 {
1442 VirtIONet *n = VIRTIO_NET(vdev);
1443 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1444
1445 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
1446 virtio_net_drop_tx_queue_data(vdev, vq);
1447 return;
1448 }
1449
1450 if (unlikely(q->tx_waiting)) {
1451 return;
1452 }
1453 q->tx_waiting = 1;
1454 /* This happens when device was stopped but VCPU wasn't. */
1455 if (!vdev->vm_running) {
1456 return;
1457 }
1458 virtio_queue_set_notification(vq, 0);
1459 qemu_bh_schedule(q->tx_bh);
1460 }
1461
1462 static void virtio_net_tx_timer(void *opaque)
1463 {
1464 VirtIONetQueue *q = opaque;
1465 VirtIONet *n = q->n;
1466 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1467 /* This happens when device was stopped but BH wasn't. */
1468 if (!vdev->vm_running) {
1469 /* Make sure tx waiting is set, so we'll run when restarted. */
1470 assert(q->tx_waiting);
1471 return;
1472 }
1473
1474 q->tx_waiting = 0;
1475
1476 /* Just in case the driver is not ready on more */
1477 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1478 return;
1479 }
1480
1481 virtio_queue_set_notification(q->tx_vq, 1);
1482 virtio_net_flush_tx(q);
1483 }
1484
1485 static void virtio_net_tx_bh(void *opaque)
1486 {
1487 VirtIONetQueue *q = opaque;
1488 VirtIONet *n = q->n;
1489 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1490 int32_t ret;
1491
1492 /* This happens when device was stopped but BH wasn't. */
1493 if (!vdev->vm_running) {
1494 /* Make sure tx waiting is set, so we'll run when restarted. */
1495 assert(q->tx_waiting);
1496 return;
1497 }
1498
1499 q->tx_waiting = 0;
1500
1501 /* Just in case the driver is not ready on more */
1502 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1503 return;
1504 }
1505
1506 ret = virtio_net_flush_tx(q);
1507 if (ret == -EBUSY || ret == -EINVAL) {
1508 return; /* Notification re-enable handled by tx_complete or device
1509 * broken */
1510 }
1511
1512 /* If we flush a full burst of packets, assume there are
1513 * more coming and immediately reschedule */
1514 if (ret >= n->tx_burst) {
1515 qemu_bh_schedule(q->tx_bh);
1516 q->tx_waiting = 1;
1517 return;
1518 }
1519
1520 /* If less than a full burst, re-enable notification and flush
1521 * anything that may have come in while we weren't looking. If
1522 * we find something, assume the guest is still active and reschedule */
1523 virtio_queue_set_notification(q->tx_vq, 1);
1524 ret = virtio_net_flush_tx(q);
1525 if (ret == -EINVAL) {
1526 return;
1527 } else if (ret > 0) {
1528 virtio_queue_set_notification(q->tx_vq, 0);
1529 qemu_bh_schedule(q->tx_bh);
1530 q->tx_waiting = 1;
1531 }
1532 }
1533
1534 static void virtio_net_add_queue(VirtIONet *n, int index)
1535 {
1536 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1537
1538 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
1539 virtio_net_handle_rx);
1540
1541 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1542 n->vqs[index].tx_vq =
1543 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
1544 virtio_net_handle_tx_timer);
1545 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1546 virtio_net_tx_timer,
1547 &n->vqs[index]);
1548 } else {
1549 n->vqs[index].tx_vq =
1550 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
1551 virtio_net_handle_tx_bh);
1552 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
1553 }
1554
1555 n->vqs[index].tx_waiting = 0;
1556 n->vqs[index].n = n;
1557 }
1558
1559 static void virtio_net_del_queue(VirtIONet *n, int index)
1560 {
1561 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1562 VirtIONetQueue *q = &n->vqs[index];
1563 NetClientState *nc = qemu_get_subqueue(n->nic, index);
1564
1565 qemu_purge_queued_packets(nc);
1566
1567 virtio_del_queue(vdev, index * 2);
1568 if (q->tx_timer) {
1569 timer_del(q->tx_timer);
1570 timer_free(q->tx_timer);
1571 q->tx_timer = NULL;
1572 } else {
1573 qemu_bh_delete(q->tx_bh);
1574 q->tx_bh = NULL;
1575 }
1576 q->tx_waiting = 0;
1577 virtio_del_queue(vdev, index * 2 + 1);
1578 }
1579
1580 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues)
1581 {
1582 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1583 int old_num_queues = virtio_get_num_queues(vdev);
1584 int new_num_queues = new_max_queues * 2 + 1;
1585 int i;
1586
1587 assert(old_num_queues >= 3);
1588 assert(old_num_queues % 2 == 1);
1589
1590 if (old_num_queues == new_num_queues) {
1591 return;
1592 }
1593
1594 /*
1595 * We always need to remove and add ctrl vq if
1596 * old_num_queues != new_num_queues. Remove ctrl_vq first,
1597 * and then we only enter one of the following too loops.
1598 */
1599 virtio_del_queue(vdev, old_num_queues - 1);
1600
1601 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
1602 /* new_num_queues < old_num_queues */
1603 virtio_net_del_queue(n, i / 2);
1604 }
1605
1606 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
1607 /* new_num_queues > old_num_queues */
1608 virtio_net_add_queue(n, i / 2);
1609 }
1610
1611 /* add ctrl_vq last */
1612 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1613 }
1614
1615 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1616 {
1617 int max = multiqueue ? n->max_queues : 1;
1618
1619 n->multiqueue = multiqueue;
1620 virtio_net_change_num_queues(n, max);
1621
1622 virtio_net_set_queues(n);
1623 }
1624
1625 static int virtio_net_post_load_device(void *opaque, int version_id)
1626 {
1627 VirtIONet *n = opaque;
1628 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1629 int i, link_down;
1630
1631 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs,
1632 virtio_vdev_has_feature(vdev,
1633 VIRTIO_F_VERSION_1));
1634
1635 /* MAC_TABLE_ENTRIES may be different from the saved image */
1636 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) {
1637 n->mac_table.in_use = 0;
1638 }
1639
1640 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1641 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1642 }
1643
1644 if (peer_has_vnet_hdr(n)) {
1645 virtio_net_apply_guest_offloads(n);
1646 }
1647
1648 virtio_net_set_queues(n);
1649
1650 /* Find the first multicast entry in the saved MAC filter */
1651 for (i = 0; i < n->mac_table.in_use; i++) {
1652 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1653 break;
1654 }
1655 }
1656 n->mac_table.first_multi = i;
1657
1658 /* nc.link_down can't be migrated, so infer link_down according
1659 * to link status bit in n->status */
1660 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1661 for (i = 0; i < n->max_queues; i++) {
1662 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1663 }
1664
1665 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
1666 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
1667 n->announce_counter = SELF_ANNOUNCE_ROUNDS;
1668 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
1669 }
1670
1671 return 0;
1672 }
1673
1674 /* tx_waiting field of a VirtIONetQueue */
1675 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = {
1676 .name = "virtio-net-queue-tx_waiting",
1677 .fields = (VMStateField[]) {
1678 VMSTATE_UINT32(tx_waiting, VirtIONetQueue),
1679 VMSTATE_END_OF_LIST()
1680 },
1681 };
1682
1683 static bool max_queues_gt_1(void *opaque, int version_id)
1684 {
1685 return VIRTIO_NET(opaque)->max_queues > 1;
1686 }
1687
1688 static bool has_ctrl_guest_offloads(void *opaque, int version_id)
1689 {
1690 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque),
1691 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
1692 }
1693
1694 static bool mac_table_fits(void *opaque, int version_id)
1695 {
1696 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES;
1697 }
1698
1699 static bool mac_table_doesnt_fit(void *opaque, int version_id)
1700 {
1701 return !mac_table_fits(opaque, version_id);
1702 }
1703
1704 /* This temporary type is shared by all the WITH_TMP methods
1705 * although only some fields are used by each.
1706 */
1707 struct VirtIONetMigTmp {
1708 VirtIONet *parent;
1709 VirtIONetQueue *vqs_1;
1710 uint16_t curr_queues_1;
1711 uint8_t has_ufo;
1712 uint32_t has_vnet_hdr;
1713 };
1714
1715 /* The 2nd and subsequent tx_waiting flags are loaded later than
1716 * the 1st entry in the queues and only if there's more than one
1717 * entry. We use the tmp mechanism to calculate a temporary
1718 * pointer and count and also validate the count.
1719 */
1720
1721 static int virtio_net_tx_waiting_pre_save(void *opaque)
1722 {
1723 struct VirtIONetMigTmp *tmp = opaque;
1724
1725 tmp->vqs_1 = tmp->parent->vqs + 1;
1726 tmp->curr_queues_1 = tmp->parent->curr_queues - 1;
1727 if (tmp->parent->curr_queues == 0) {
1728 tmp->curr_queues_1 = 0;
1729 }
1730
1731 return 0;
1732 }
1733
1734 static int virtio_net_tx_waiting_pre_load(void *opaque)
1735 {
1736 struct VirtIONetMigTmp *tmp = opaque;
1737
1738 /* Reuse the pointer setup from save */
1739 virtio_net_tx_waiting_pre_save(opaque);
1740
1741 if (tmp->parent->curr_queues > tmp->parent->max_queues) {
1742 error_report("virtio-net: curr_queues %x > max_queues %x",
1743 tmp->parent->curr_queues, tmp->parent->max_queues);
1744
1745 return -EINVAL;
1746 }
1747
1748 return 0; /* all good */
1749 }
1750
1751 static const VMStateDescription vmstate_virtio_net_tx_waiting = {
1752 .name = "virtio-net-tx_waiting",
1753 .pre_load = virtio_net_tx_waiting_pre_load,
1754 .pre_save = virtio_net_tx_waiting_pre_save,
1755 .fields = (VMStateField[]) {
1756 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp,
1757 curr_queues_1,
1758 vmstate_virtio_net_queue_tx_waiting,
1759 struct VirtIONetQueue),
1760 VMSTATE_END_OF_LIST()
1761 },
1762 };
1763
1764 /* the 'has_ufo' flag is just tested; if the incoming stream has the
1765 * flag set we need to check that we have it
1766 */
1767 static int virtio_net_ufo_post_load(void *opaque, int version_id)
1768 {
1769 struct VirtIONetMigTmp *tmp = opaque;
1770
1771 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) {
1772 error_report("virtio-net: saved image requires TUN_F_UFO support");
1773 return -EINVAL;
1774 }
1775
1776 return 0;
1777 }
1778
1779 static int virtio_net_ufo_pre_save(void *opaque)
1780 {
1781 struct VirtIONetMigTmp *tmp = opaque;
1782
1783 tmp->has_ufo = tmp->parent->has_ufo;
1784
1785 return 0;
1786 }
1787
1788 static const VMStateDescription vmstate_virtio_net_has_ufo = {
1789 .name = "virtio-net-ufo",
1790 .post_load = virtio_net_ufo_post_load,
1791 .pre_save = virtio_net_ufo_pre_save,
1792 .fields = (VMStateField[]) {
1793 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp),
1794 VMSTATE_END_OF_LIST()
1795 },
1796 };
1797
1798 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
1799 * flag set we need to check that we have it
1800 */
1801 static int virtio_net_vnet_post_load(void *opaque, int version_id)
1802 {
1803 struct VirtIONetMigTmp *tmp = opaque;
1804
1805 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) {
1806 error_report("virtio-net: saved image requires vnet_hdr=on");
1807 return -EINVAL;
1808 }
1809
1810 return 0;
1811 }
1812
1813 static int virtio_net_vnet_pre_save(void *opaque)
1814 {
1815 struct VirtIONetMigTmp *tmp = opaque;
1816
1817 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
1818
1819 return 0;
1820 }
1821
1822 static const VMStateDescription vmstate_virtio_net_has_vnet = {
1823 .name = "virtio-net-vnet",
1824 .post_load = virtio_net_vnet_post_load,
1825 .pre_save = virtio_net_vnet_pre_save,
1826 .fields = (VMStateField[]) {
1827 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp),
1828 VMSTATE_END_OF_LIST()
1829 },
1830 };
1831
1832 static const VMStateDescription vmstate_virtio_net_device = {
1833 .name = "virtio-net-device",
1834 .version_id = VIRTIO_NET_VM_VERSION,
1835 .minimum_version_id = VIRTIO_NET_VM_VERSION,
1836 .post_load = virtio_net_post_load_device,
1837 .fields = (VMStateField[]) {
1838 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN),
1839 VMSTATE_STRUCT_POINTER(vqs, VirtIONet,
1840 vmstate_virtio_net_queue_tx_waiting,
1841 VirtIONetQueue),
1842 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet),
1843 VMSTATE_UINT16(status, VirtIONet),
1844 VMSTATE_UINT8(promisc, VirtIONet),
1845 VMSTATE_UINT8(allmulti, VirtIONet),
1846 VMSTATE_UINT32(mac_table.in_use, VirtIONet),
1847
1848 /* Guarded pair: If it fits we load it, else we throw it away
1849 * - can happen if source has a larger MAC table.; post-load
1850 * sets flags in this case.
1851 */
1852 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet,
1853 0, mac_table_fits, mac_table.in_use,
1854 ETH_ALEN),
1855 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0,
1856 mac_table.in_use, ETH_ALEN),
1857
1858 /* Note: This is an array of uint32's that's always been saved as a
1859 * buffer; hold onto your endiannesses; it's actually used as a bitmap
1860 * but based on the uint.
1861 */
1862 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3),
1863 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1864 vmstate_virtio_net_has_vnet),
1865 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet),
1866 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet),
1867 VMSTATE_UINT8(alluni, VirtIONet),
1868 VMSTATE_UINT8(nomulti, VirtIONet),
1869 VMSTATE_UINT8(nouni, VirtIONet),
1870 VMSTATE_UINT8(nobcast, VirtIONet),
1871 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1872 vmstate_virtio_net_has_ufo),
1873 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0,
1874 vmstate_info_uint16_equal, uint16_t),
1875 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1),
1876 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1877 vmstate_virtio_net_tx_waiting),
1878 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet,
1879 has_ctrl_guest_offloads),
1880 VMSTATE_END_OF_LIST()
1881 },
1882 };
1883
1884 static NetClientInfo net_virtio_info = {
1885 .type = NET_CLIENT_DRIVER_NIC,
1886 .size = sizeof(NICState),
1887 .can_receive = virtio_net_can_receive,
1888 .receive = virtio_net_receive,
1889 .link_status_changed = virtio_net_set_link_status,
1890 .query_rx_filter = virtio_net_query_rxfilter,
1891 };
1892
1893 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1894 {
1895 VirtIONet *n = VIRTIO_NET(vdev);
1896 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1897 assert(n->vhost_started);
1898 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
1899 }
1900
1901 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
1902 bool mask)
1903 {
1904 VirtIONet *n = VIRTIO_NET(vdev);
1905 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1906 assert(n->vhost_started);
1907 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
1908 vdev, idx, mask);
1909 }
1910
1911 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
1912 {
1913 int i, config_size = 0;
1914 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
1915
1916 for (i = 0; feature_sizes[i].flags != 0; i++) {
1917 if (host_features & feature_sizes[i].flags) {
1918 config_size = MAX(feature_sizes[i].end, config_size);
1919 }
1920 }
1921 n->config_size = config_size;
1922 }
1923
1924 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1925 const char *type)
1926 {
1927 /*
1928 * The name can be NULL, the netclient name will be type.x.
1929 */
1930 assert(type != NULL);
1931
1932 g_free(n->netclient_name);
1933 g_free(n->netclient_type);
1934 n->netclient_name = g_strdup(name);
1935 n->netclient_type = g_strdup(type);
1936 }
1937
1938 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
1939 {
1940 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1941 VirtIONet *n = VIRTIO_NET(dev);
1942 NetClientState *nc;
1943 int i;
1944
1945 if (n->net_conf.mtu) {
1946 n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
1947 }
1948
1949 if (n->net_conf.duplex_str) {
1950 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
1951 n->net_conf.duplex = DUPLEX_HALF;
1952 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
1953 n->net_conf.duplex = DUPLEX_FULL;
1954 } else {
1955 error_setg(errp, "'duplex' must be 'half' or 'full'");
1956 }
1957 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
1958 } else {
1959 n->net_conf.duplex = DUPLEX_UNKNOWN;
1960 }
1961
1962 if (n->net_conf.speed < SPEED_UNKNOWN) {
1963 error_setg(errp, "'speed' must be between 0 and INT_MAX");
1964 } else if (n->net_conf.speed >= 0) {
1965 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
1966 }
1967
1968 virtio_net_set_config_size(n, n->host_features);
1969 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
1970
1971 /*
1972 * We set a lower limit on RX queue size to what it always was.
1973 * Guests that want a smaller ring can always resize it without
1974 * help from us (using virtio 1 and up).
1975 */
1976 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||
1977 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||
1978 !is_power_of_2(n->net_conf.rx_queue_size)) {
1979 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "
1980 "must be a power of 2 between %d and %d.",
1981 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,
1982 VIRTQUEUE_MAX_SIZE);
1983 virtio_cleanup(vdev);
1984 return;
1985 }
1986
1987 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE ||
1988 n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE ||
1989 !is_power_of_2(n->net_conf.tx_queue_size)) {
1990 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), "
1991 "must be a power of 2 between %d and %d",
1992 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE,
1993 VIRTQUEUE_MAX_SIZE);
1994 virtio_cleanup(vdev);
1995 return;
1996 }
1997
1998 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
1999 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
2000 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
2001 "must be a positive integer less than %d.",
2002 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
2003 virtio_cleanup(vdev);
2004 return;
2005 }
2006 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
2007 n->curr_queues = 1;
2008 n->tx_timeout = n->net_conf.txtimer;
2009
2010 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
2011 && strcmp(n->net_conf.tx, "bh")) {
2012 error_report("virtio-net: "
2013 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
2014 n->net_conf.tx);
2015 error_report("Defaulting to \"bh\"");
2016 }
2017
2018 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
2019 n->net_conf.tx_queue_size);
2020
2021 for (i = 0; i < n->max_queues; i++) {
2022 virtio_net_add_queue(n, i);
2023 }
2024
2025 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
2026 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
2027 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
2028 n->status = VIRTIO_NET_S_LINK_UP;
2029 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
2030 virtio_net_announce_timer, n);
2031
2032 if (n->netclient_type) {
2033 /*
2034 * Happen when virtio_net_set_netclient_name has been called.
2035 */
2036 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
2037 n->netclient_type, n->netclient_name, n);
2038 } else {
2039 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
2040 object_get_typename(OBJECT(dev)), dev->id, n);
2041 }
2042
2043 peer_test_vnet_hdr(n);
2044 if (peer_has_vnet_hdr(n)) {
2045 for (i = 0; i < n->max_queues; i++) {
2046 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
2047 }
2048 n->host_hdr_len = sizeof(struct virtio_net_hdr);
2049 } else {
2050 n->host_hdr_len = 0;
2051 }
2052
2053 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
2054
2055 n->vqs[0].tx_waiting = 0;
2056 n->tx_burst = n->net_conf.txburst;
2057 virtio_net_set_mrg_rx_bufs(n, 0, 0);
2058 n->promisc = 1; /* for compatibility */
2059
2060 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
2061
2062 n->vlans = g_malloc0(MAX_VLAN >> 3);
2063
2064 nc = qemu_get_queue(n->nic);
2065 nc->rxfilter_notify_enabled = 1;
2066
2067 n->qdev = dev;
2068 }
2069
2070 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
2071 {
2072 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
2073 VirtIONet *n = VIRTIO_NET(dev);
2074 int i, max_queues;
2075
2076 /* This will stop vhost backend if appropriate. */
2077 virtio_net_set_status(vdev, 0);
2078
2079 g_free(n->netclient_name);
2080 n->netclient_name = NULL;
2081 g_free(n->netclient_type);
2082 n->netclient_type = NULL;
2083
2084 g_free(n->mac_table.macs);
2085 g_free(n->vlans);
2086
2087 max_queues = n->multiqueue ? n->max_queues : 1;
2088 for (i = 0; i < max_queues; i++) {
2089 virtio_net_del_queue(n, i);
2090 }
2091
2092 timer_del(n->announce_timer);
2093 timer_free(n->announce_timer);
2094 g_free(n->vqs);
2095 qemu_del_nic(n->nic);
2096 virtio_cleanup(vdev);
2097 }
2098
2099 static void virtio_net_instance_init(Object *obj)
2100 {
2101 VirtIONet *n = VIRTIO_NET(obj);
2102
2103 /*
2104 * The default config_size is sizeof(struct virtio_net_config).
2105 * Can be overriden with virtio_net_set_config_size.
2106 */
2107 n->config_size = sizeof(struct virtio_net_config);
2108 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
2109 "bootindex", "/ethernet-phy@0",
2110 DEVICE(n), NULL);
2111 }
2112
2113 static int virtio_net_pre_save(void *opaque)
2114 {
2115 VirtIONet *n = opaque;
2116
2117 /* At this point, backend must be stopped, otherwise
2118 * it might keep writing to memory. */
2119 assert(!n->vhost_started);
2120
2121 return 0;
2122 }
2123
2124 static const VMStateDescription vmstate_virtio_net = {
2125 .name = "virtio-net",
2126 .minimum_version_id = VIRTIO_NET_VM_VERSION,
2127 .version_id = VIRTIO_NET_VM_VERSION,
2128 .fields = (VMStateField[]) {
2129 VMSTATE_VIRTIO_DEVICE,
2130 VMSTATE_END_OF_LIST()
2131 },
2132 .pre_save = virtio_net_pre_save,
2133 };
2134
2135 static Property virtio_net_properties[] = {
2136 DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
2137 VIRTIO_NET_F_CSUM, true),
2138 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
2139 VIRTIO_NET_F_GUEST_CSUM, true),
2140 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
2141 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
2142 VIRTIO_NET_F_GUEST_TSO4, true),
2143 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
2144 VIRTIO_NET_F_GUEST_TSO6, true),
2145 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
2146 VIRTIO_NET_F_GUEST_ECN, true),
2147 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
2148 VIRTIO_NET_F_GUEST_UFO, true),
2149 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
2150 VIRTIO_NET_F_GUEST_ANNOUNCE, true),
2151 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
2152 VIRTIO_NET_F_HOST_TSO4, true),
2153 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
2154 VIRTIO_NET_F_HOST_TSO6, true),
2155 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
2156 VIRTIO_NET_F_HOST_ECN, true),
2157 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
2158 VIRTIO_NET_F_HOST_UFO, true),
2159 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
2160 VIRTIO_NET_F_MRG_RXBUF, true),
2161 DEFINE_PROP_BIT64("status", VirtIONet, host_features,
2162 VIRTIO_NET_F_STATUS, true),
2163 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
2164 VIRTIO_NET_F_CTRL_VQ, true),
2165 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
2166 VIRTIO_NET_F_CTRL_RX, true),
2167 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
2168 VIRTIO_NET_F_CTRL_VLAN, true),
2169 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
2170 VIRTIO_NET_F_CTRL_RX_EXTRA, true),
2171 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
2172 VIRTIO_NET_F_CTRL_MAC_ADDR, true),
2173 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
2174 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
2175 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
2176 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
2177 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
2178 TX_TIMER_INTERVAL),
2179 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
2180 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
2181 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
2182 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
2183 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
2184 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
2185 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
2186 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
2187 true),
2188 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
2189 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
2190 DEFINE_PROP_END_OF_LIST(),
2191 };
2192
2193 static void virtio_net_class_init(ObjectClass *klass, void *data)
2194 {
2195 DeviceClass *dc = DEVICE_CLASS(klass);
2196 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
2197
2198 dc->props = virtio_net_properties;
2199 dc->vmsd = &vmstate_virtio_net;
2200 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
2201 vdc->realize = virtio_net_device_realize;
2202 vdc->unrealize = virtio_net_device_unrealize;
2203 vdc->get_config = virtio_net_get_config;
2204 vdc->set_config = virtio_net_set_config;
2205 vdc->get_features = virtio_net_get_features;
2206 vdc->set_features = virtio_net_set_features;
2207 vdc->bad_features = virtio_net_bad_features;
2208 vdc->reset = virtio_net_reset;
2209 vdc->set_status = virtio_net_set_status;
2210 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
2211 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
2212 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
2213 vdc->vmsd = &vmstate_virtio_net_device;
2214 }
2215
2216 static const TypeInfo virtio_net_info = {
2217 .name = TYPE_VIRTIO_NET,
2218 .parent = TYPE_VIRTIO_DEVICE,
2219 .instance_size = sizeof(VirtIONet),
2220 .instance_init = virtio_net_instance_init,
2221 .class_init = virtio_net_class_init,
2222 };
2223
2224 static void virtio_register_types(void)
2225 {
2226 type_register_static(&virtio_net_info);
2227 }
2228
2229 type_init(virtio_register_types)
AR7 emulation for QEMU