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hw/arm: make bitbanded IO optional on ARMv7-M
[qemu/ar7.git] / hw / net / virtio-net.c
blobf154756e85645773e42273ac6ccd3109a5fe9f37
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_field(container, 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 int i;
431
432 /* Reset back to compatibility mode */
433 n->promisc = 1;
434 n->allmulti = 0;
435 n->alluni = 0;
436 n->nomulti = 0;
437 n->nouni = 0;
438 n->nobcast = 0;
439 /* multiqueue is disabled by default */
440 n->curr_queues = 1;
441 timer_del(n->announce_timer);
442 n->announce_counter = 0;
443 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
444
445 /* Flush any MAC and VLAN filter table state */
446 n->mac_table.in_use = 0;
447 n->mac_table.first_multi = 0;
448 n->mac_table.multi_overflow = 0;
449 n->mac_table.uni_overflow = 0;
450 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
451 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
452 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
453 memset(n->vlans, 0, MAX_VLAN >> 3);
454
455 /* Flush any async TX */
456 for (i = 0; i < n->max_queues; i++) {
457 NetClientState *nc = qemu_get_subqueue(n->nic, i);
458
459 if (nc->peer) {
460 qemu_flush_or_purge_queued_packets(nc->peer, true);
461 assert(!virtio_net_get_subqueue(nc)->async_tx.elem);
462 }
463 }
464 }
465
466 static void peer_test_vnet_hdr(VirtIONet *n)
467 {
468 NetClientState *nc = qemu_get_queue(n->nic);
469 if (!nc->peer) {
470 return;
471 }
472
473 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
474 }
475
476 static int peer_has_vnet_hdr(VirtIONet *n)
477 {
478 return n->has_vnet_hdr;
479 }
480
481 static int peer_has_ufo(VirtIONet *n)
482 {
483 if (!peer_has_vnet_hdr(n))
484 return 0;
485
486 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
487
488 return n->has_ufo;
489 }
490
491 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
492 int version_1)
493 {
494 int i;
495 NetClientState *nc;
496
497 n->mergeable_rx_bufs = mergeable_rx_bufs;
498
499 if (version_1) {
500 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
501 } else {
502 n->guest_hdr_len = n->mergeable_rx_bufs ?
503 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
504 sizeof(struct virtio_net_hdr);
505 }
506
507 for (i = 0; i < n->max_queues; i++) {
508 nc = qemu_get_subqueue(n->nic, i);
509
510 if (peer_has_vnet_hdr(n) &&
511 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
512 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
513 n->host_hdr_len = n->guest_hdr_len;
514 }
515 }
516 }
517
518 static int virtio_net_max_tx_queue_size(VirtIONet *n)
519 {
520 NetClientState *peer = n->nic_conf.peers.ncs[0];
521
522 /*
523 * Backends other than vhost-user don't support max queue size.
524 */
525 if (!peer) {
526 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
527 }
528
529 if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
530 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
531 }
532
533 return VIRTQUEUE_MAX_SIZE;
534 }
535
536 static int peer_attach(VirtIONet *n, int index)
537 {
538 NetClientState *nc = qemu_get_subqueue(n->nic, index);
539
540 if (!nc->peer) {
541 return 0;
542 }
543
544 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
545 vhost_set_vring_enable(nc->peer, 1);
546 }
547
548 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
549 return 0;
550 }
551
552 if (n->max_queues == 1) {
553 return 0;
554 }
555
556 return tap_enable(nc->peer);
557 }
558
559 static int peer_detach(VirtIONet *n, int index)
560 {
561 NetClientState *nc = qemu_get_subqueue(n->nic, index);
562
563 if (!nc->peer) {
564 return 0;
565 }
566
567 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
568 vhost_set_vring_enable(nc->peer, 0);
569 }
570
571 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
572 return 0;
573 }
574
575 return tap_disable(nc->peer);
576 }
577
578 static void virtio_net_set_queues(VirtIONet *n)
579 {
580 int i;
581 int r;
582
583 if (n->nic->peer_deleted) {
584 return;
585 }
586
587 for (i = 0; i < n->max_queues; i++) {
588 if (i < n->curr_queues) {
589 r = peer_attach(n, i);
590 assert(!r);
591 } else {
592 r = peer_detach(n, i);
593 assert(!r);
594 }
595 }
596 }
597
598 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
599
600 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
601 Error **errp)
602 {
603 VirtIONet *n = VIRTIO_NET(vdev);
604 NetClientState *nc = qemu_get_queue(n->nic);
605
606 /* Firstly sync all virtio-net possible supported features */
607 features |= n->host_features;
608
609 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
610
611 if (!peer_has_vnet_hdr(n)) {
612 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
613 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
614 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
615 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
616
617 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
618 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
619 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
620 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
621 }
622
623 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
624 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
625 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
626 }
627
628 if (!get_vhost_net(nc->peer)) {
629 return features;
630 }
631 features = vhost_net_get_features(get_vhost_net(nc->peer), features);
632 vdev->backend_features = features;
633
634 if (n->mtu_bypass_backend &&
635 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
636 features |= (1ULL << VIRTIO_NET_F_MTU);
637 }
638
639 return features;
640 }
641
642 static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
643 {
644 uint64_t features = 0;
645
646 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
647 * but also these: */
648 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
649 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
650 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
651 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
652 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
653
654 return features;
655 }
656
657 static void virtio_net_apply_guest_offloads(VirtIONet *n)
658 {
659 qemu_set_offload(qemu_get_queue(n->nic)->peer,
660 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
661 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
662 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
663 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
664 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
665 }
666
667 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
668 {
669 static const uint64_t guest_offloads_mask =
670 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
671 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
672 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
673 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
674 (1ULL << VIRTIO_NET_F_GUEST_UFO);
675
676 return guest_offloads_mask & features;
677 }
678
679 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
680 {
681 VirtIODevice *vdev = VIRTIO_DEVICE(n);
682 return virtio_net_guest_offloads_by_features(vdev->guest_features);
683 }
684
685 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
686 {
687 VirtIONet *n = VIRTIO_NET(vdev);
688 int i;
689
690 if (n->mtu_bypass_backend &&
691 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) {
692 features &= ~(1ULL << VIRTIO_NET_F_MTU);
693 }
694
695 virtio_net_set_multiqueue(n,
696 virtio_has_feature(features, VIRTIO_NET_F_MQ));
697
698 virtio_net_set_mrg_rx_bufs(n,
699 virtio_has_feature(features,
700 VIRTIO_NET_F_MRG_RXBUF),
701 virtio_has_feature(features,
702 VIRTIO_F_VERSION_1));
703
704 if (n->has_vnet_hdr) {
705 n->curr_guest_offloads =
706 virtio_net_guest_offloads_by_features(features);
707 virtio_net_apply_guest_offloads(n);
708 }
709
710 for (i = 0; i < n->max_queues; i++) {
711 NetClientState *nc = qemu_get_subqueue(n->nic, i);
712
713 if (!get_vhost_net(nc->peer)) {
714 continue;
715 }
716 vhost_net_ack_features(get_vhost_net(nc->peer), features);
717 }
718
719 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
720 memset(n->vlans, 0, MAX_VLAN >> 3);
721 } else {
722 memset(n->vlans, 0xff, MAX_VLAN >> 3);
723 }
724 }
725
726 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
727 struct iovec *iov, unsigned int iov_cnt)
728 {
729 uint8_t on;
730 size_t s;
731 NetClientState *nc = qemu_get_queue(n->nic);
732
733 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
734 if (s != sizeof(on)) {
735 return VIRTIO_NET_ERR;
736 }
737
738 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
739 n->promisc = on;
740 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
741 n->allmulti = on;
742 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
743 n->alluni = on;
744 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
745 n->nomulti = on;
746 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
747 n->nouni = on;
748 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
749 n->nobcast = on;
750 } else {
751 return VIRTIO_NET_ERR;
752 }
753
754 rxfilter_notify(nc);
755
756 return VIRTIO_NET_OK;
757 }
758
759 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
760 struct iovec *iov, unsigned int iov_cnt)
761 {
762 VirtIODevice *vdev = VIRTIO_DEVICE(n);
763 uint64_t offloads;
764 size_t s;
765
766 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
767 return VIRTIO_NET_ERR;
768 }
769
770 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
771 if (s != sizeof(offloads)) {
772 return VIRTIO_NET_ERR;
773 }
774
775 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
776 uint64_t supported_offloads;
777
778 offloads = virtio_ldq_p(vdev, &offloads);
779
780 if (!n->has_vnet_hdr) {
781 return VIRTIO_NET_ERR;
782 }
783
784 supported_offloads = virtio_net_supported_guest_offloads(n);
785 if (offloads & ~supported_offloads) {
786 return VIRTIO_NET_ERR;
787 }
788
789 n->curr_guest_offloads = offloads;
790 virtio_net_apply_guest_offloads(n);
791
792 return VIRTIO_NET_OK;
793 } else {
794 return VIRTIO_NET_ERR;
795 }
796 }
797
798 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
799 struct iovec *iov, unsigned int iov_cnt)
800 {
801 VirtIODevice *vdev = VIRTIO_DEVICE(n);
802 struct virtio_net_ctrl_mac mac_data;
803 size_t s;
804 NetClientState *nc = qemu_get_queue(n->nic);
805
806 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
807 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
808 return VIRTIO_NET_ERR;
809 }
810 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
811 assert(s == sizeof(n->mac));
812 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
813 rxfilter_notify(nc);
814
815 return VIRTIO_NET_OK;
816 }
817
818 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
819 return VIRTIO_NET_ERR;
820 }
821
822 int in_use = 0;
823 int first_multi = 0;
824 uint8_t uni_overflow = 0;
825 uint8_t multi_overflow = 0;
826 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
827
828 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
829 sizeof(mac_data.entries));
830 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
831 if (s != sizeof(mac_data.entries)) {
832 goto error;
833 }
834 iov_discard_front(&iov, &iov_cnt, s);
835
836 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
837 goto error;
838 }
839
840 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
841 s = iov_to_buf(iov, iov_cnt, 0, macs,
842 mac_data.entries * ETH_ALEN);
843 if (s != mac_data.entries * ETH_ALEN) {
844 goto error;
845 }
846 in_use += mac_data.entries;
847 } else {
848 uni_overflow = 1;
849 }
850
851 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
852
853 first_multi = in_use;
854
855 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
856 sizeof(mac_data.entries));
857 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
858 if (s != sizeof(mac_data.entries)) {
859 goto error;
860 }
861
862 iov_discard_front(&iov, &iov_cnt, s);
863
864 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
865 goto error;
866 }
867
868 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
869 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
870 mac_data.entries * ETH_ALEN);
871 if (s != mac_data.entries * ETH_ALEN) {
872 goto error;
873 }
874 in_use += mac_data.entries;
875 } else {
876 multi_overflow = 1;
877 }
878
879 n->mac_table.in_use = in_use;
880 n->mac_table.first_multi = first_multi;
881 n->mac_table.uni_overflow = uni_overflow;
882 n->mac_table.multi_overflow = multi_overflow;
883 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
884 g_free(macs);
885 rxfilter_notify(nc);
886
887 return VIRTIO_NET_OK;
888
889 error:
890 g_free(macs);
891 return VIRTIO_NET_ERR;
892 }
893
894 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
895 struct iovec *iov, unsigned int iov_cnt)
896 {
897 VirtIODevice *vdev = VIRTIO_DEVICE(n);
898 uint16_t vid;
899 size_t s;
900 NetClientState *nc = qemu_get_queue(n->nic);
901
902 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
903 vid = virtio_lduw_p(vdev, &vid);
904 if (s != sizeof(vid)) {
905 return VIRTIO_NET_ERR;
906 }
907
908 if (vid >= MAX_VLAN)
909 return VIRTIO_NET_ERR;
910
911 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
912 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
913 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
914 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
915 else
916 return VIRTIO_NET_ERR;
917
918 rxfilter_notify(nc);
919
920 return VIRTIO_NET_OK;
921 }
922
923 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
924 struct iovec *iov, unsigned int iov_cnt)
925 {
926 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
927 n->status & VIRTIO_NET_S_ANNOUNCE) {
928 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
929 if (n->announce_counter) {
930 timer_mod(n->announce_timer,
931 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
932 self_announce_delay(n->announce_counter));
933 }
934 return VIRTIO_NET_OK;
935 } else {
936 return VIRTIO_NET_ERR;
937 }
938 }
939
940 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
941 struct iovec *iov, unsigned int iov_cnt)
942 {
943 VirtIODevice *vdev = VIRTIO_DEVICE(n);
944 struct virtio_net_ctrl_mq mq;
945 size_t s;
946 uint16_t queues;
947
948 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
949 if (s != sizeof(mq)) {
950 return VIRTIO_NET_ERR;
951 }
952
953 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
954 return VIRTIO_NET_ERR;
955 }
956
957 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
958
959 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
960 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
961 queues > n->max_queues ||
962 !n->multiqueue) {
963 return VIRTIO_NET_ERR;
964 }
965
966 n->curr_queues = queues;
967 /* stop the backend before changing the number of queues to avoid handling a
968 * disabled queue */
969 virtio_net_set_status(vdev, vdev->status);
970 virtio_net_set_queues(n);
971
972 return VIRTIO_NET_OK;
973 }
974
975 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
976 {
977 VirtIONet *n = VIRTIO_NET(vdev);
978 struct virtio_net_ctrl_hdr ctrl;
979 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
980 VirtQueueElement *elem;
981 size_t s;
982 struct iovec *iov, *iov2;
983 unsigned int iov_cnt;
984
985 for (;;) {
986 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
987 if (!elem) {
988 break;
989 }
990 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) ||
991 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) {
992 virtio_error(vdev, "virtio-net ctrl missing headers");
993 virtqueue_detach_element(vq, elem, 0);
994 g_free(elem);
995 break;
996 }
997
998 iov_cnt = elem->out_num;
999 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num);
1000 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
1001 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
1002 if (s != sizeof(ctrl)) {
1003 status = VIRTIO_NET_ERR;
1004 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
1005 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
1006 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
1007 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
1008 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
1009 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
1010 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
1011 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
1012 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
1013 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
1014 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
1015 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
1016 }
1017
1018 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status));
1019 assert(s == sizeof(status));
1020
1021 virtqueue_push(vq, elem, sizeof(status));
1022 virtio_notify(vdev, vq);
1023 g_free(iov2);
1024 g_free(elem);
1025 }
1026 }
1027
1028 /* RX */
1029
1030 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
1031 {
1032 VirtIONet *n = VIRTIO_NET(vdev);
1033 int queue_index = vq2q(virtio_get_queue_index(vq));
1034
1035 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
1036 }
1037
1038 static int virtio_net_can_receive(NetClientState *nc)
1039 {
1040 VirtIONet *n = qemu_get_nic_opaque(nc);
1041 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1042 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1043
1044 if (!vdev->vm_running) {
1045 return 0;
1046 }
1047
1048 if (nc->queue_index >= n->curr_queues) {
1049 return 0;
1050 }
1051
1052 if (!virtio_queue_ready(q->rx_vq) ||
1053 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1054 return 0;
1055 }
1056
1057 return 1;
1058 }
1059
1060 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
1061 {
1062 VirtIONet *n = q->n;
1063 if (virtio_queue_empty(q->rx_vq) ||
1064 (n->mergeable_rx_bufs &&
1065 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1066 virtio_queue_set_notification(q->rx_vq, 1);
1067
1068 /* To avoid a race condition where the guest has made some buffers
1069 * available after the above check but before notification was
1070 * enabled, check for available buffers again.
1071 */
1072 if (virtio_queue_empty(q->rx_vq) ||
1073 (n->mergeable_rx_bufs &&
1074 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1075 return 0;
1076 }
1077 }
1078
1079 virtio_queue_set_notification(q->rx_vq, 0);
1080 return 1;
1081 }
1082
1083 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
1084 {
1085 virtio_tswap16s(vdev, &hdr->hdr_len);
1086 virtio_tswap16s(vdev, &hdr->gso_size);
1087 virtio_tswap16s(vdev, &hdr->csum_start);
1088 virtio_tswap16s(vdev, &hdr->csum_offset);
1089 }
1090
1091 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
1092 * it never finds out that the packets don't have valid checksums. This
1093 * causes dhclient to get upset. Fedora's carried a patch for ages to
1094 * fix this with Xen but it hasn't appeared in an upstream release of
1095 * dhclient yet.
1096 *
1097 * To avoid breaking existing guests, we catch udp packets and add
1098 * checksums. This is terrible but it's better than hacking the guest
1099 * kernels.
1100 *
1101 * N.B. if we introduce a zero-copy API, this operation is no longer free so
1102 * we should provide a mechanism to disable it to avoid polluting the host
1103 * cache.
1104 */
1105 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
1106 uint8_t *buf, size_t size)
1107 {
1108 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
1109 (size > 27 && size < 1500) && /* normal sized MTU */
1110 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
1111 (buf[23] == 17) && /* ip.protocol == UDP */
1112 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
1113 net_checksum_calculate(buf, size);
1114 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
1115 }
1116 }
1117
1118 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
1119 const void *buf, size_t size)
1120 {
1121 if (n->has_vnet_hdr) {
1122 /* FIXME this cast is evil */
1123 void *wbuf = (void *)buf;
1124 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
1125 size - n->host_hdr_len);
1126
1127 if (n->needs_vnet_hdr_swap) {
1128 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
1129 }
1130 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
1131 } else {
1132 struct virtio_net_hdr hdr = {
1133 .flags = 0,
1134 .gso_type = VIRTIO_NET_HDR_GSO_NONE
1135 };
1136 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
1137 }
1138 }
1139
1140 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
1141 {
1142 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1143 static const uint8_t vlan[] = {0x81, 0x00};
1144 uint8_t *ptr = (uint8_t *)buf;
1145 int i;
1146
1147 if (n->promisc)
1148 return 1;
1149
1150 ptr += n->host_hdr_len;
1151
1152 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
1153 int vid = lduw_be_p(ptr + 14) & 0xfff;
1154 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
1155 return 0;
1156 }
1157
1158 if (ptr[0] & 1) { // multicast
1159 if (!memcmp(ptr, bcast, sizeof(bcast))) {
1160 return !n->nobcast;
1161 } else if (n->nomulti) {
1162 return 0;
1163 } else if (n->allmulti || n->mac_table.multi_overflow) {
1164 return 1;
1165 }
1166
1167 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
1168 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1169 return 1;
1170 }
1171 }
1172 } else { // unicast
1173 if (n->nouni) {
1174 return 0;
1175 } else if (n->alluni || n->mac_table.uni_overflow) {
1176 return 1;
1177 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
1178 return 1;
1179 }
1180
1181 for (i = 0; i < n->mac_table.first_multi; i++) {
1182 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1183 return 1;
1184 }
1185 }
1186 }
1187
1188 return 0;
1189 }
1190
1191 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
1192 size_t size)
1193 {
1194 VirtIONet *n = qemu_get_nic_opaque(nc);
1195 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1196 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1197 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1198 struct virtio_net_hdr_mrg_rxbuf mhdr;
1199 unsigned mhdr_cnt = 0;
1200 size_t offset, i, guest_offset;
1201
1202 if (!virtio_net_can_receive(nc)) {
1203 return -1;
1204 }
1205
1206 /* hdr_len refers to the header we supply to the guest */
1207 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1208 return 0;
1209 }
1210
1211 if (!receive_filter(n, buf, size))
1212 return size;
1213
1214 offset = i = 0;
1215
1216 while (offset < size) {
1217 VirtQueueElement *elem;
1218 int len, total;
1219 const struct iovec *sg;
1220
1221 total = 0;
1222
1223 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
1224 if (!elem) {
1225 if (i) {
1226 virtio_error(vdev, "virtio-net unexpected empty queue: "
1227 "i %zd mergeable %d offset %zd, size %zd, "
1228 "guest hdr len %zd, host hdr len %zd "
1229 "guest features 0x%" PRIx64,
1230 i, n->mergeable_rx_bufs, offset, size,
1231 n->guest_hdr_len, n->host_hdr_len,
1232 vdev->guest_features);
1233 }
1234 return -1;
1235 }
1236
1237 if (elem->in_num < 1) {
1238 virtio_error(vdev,
1239 "virtio-net receive queue contains no in buffers");
1240 virtqueue_detach_element(q->rx_vq, elem, 0);
1241 g_free(elem);
1242 return -1;
1243 }
1244
1245 sg = elem->in_sg;
1246 if (i == 0) {
1247 assert(offset == 0);
1248 if (n->mergeable_rx_bufs) {
1249 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1250 sg, elem->in_num,
1251 offsetof(typeof(mhdr), num_buffers),
1252 sizeof(mhdr.num_buffers));
1253 }
1254
1255 receive_header(n, sg, elem->in_num, buf, size);
1256 offset = n->host_hdr_len;
1257 total += n->guest_hdr_len;
1258 guest_offset = n->guest_hdr_len;
1259 } else {
1260 guest_offset = 0;
1261 }
1262
1263 /* copy in packet. ugh */
1264 len = iov_from_buf(sg, elem->in_num, guest_offset,
1265 buf + offset, size - offset);
1266 total += len;
1267 offset += len;
1268 /* If buffers can't be merged, at this point we
1269 * must have consumed the complete packet.
1270 * Otherwise, drop it. */
1271 if (!n->mergeable_rx_bufs && offset < size) {
1272 virtqueue_unpop(q->rx_vq, elem, total);
1273 g_free(elem);
1274 return size;
1275 }
1276
1277 /* signal other side */
1278 virtqueue_fill(q->rx_vq, elem, total, i++);
1279 g_free(elem);
1280 }
1281
1282 if (mhdr_cnt) {
1283 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1284 iov_from_buf(mhdr_sg, mhdr_cnt,
1285 0,
1286 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1287 }
1288
1289 virtqueue_flush(q->rx_vq, i);
1290 virtio_notify(vdev, q->rx_vq);
1291
1292 return size;
1293 }
1294
1295 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
1296 size_t size)
1297 {
1298 ssize_t r;
1299
1300 rcu_read_lock();
1301 r = virtio_net_receive_rcu(nc, buf, size);
1302 rcu_read_unlock();
1303 return r;
1304 }
1305
1306 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1307
1308 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1309 {
1310 VirtIONet *n = qemu_get_nic_opaque(nc);
1311 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1312 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1313
1314 virtqueue_push(q->tx_vq, q->async_tx.elem, 0);
1315 virtio_notify(vdev, q->tx_vq);
1316
1317 g_free(q->async_tx.elem);
1318 q->async_tx.elem = NULL;
1319
1320 virtio_queue_set_notification(q->tx_vq, 1);
1321 virtio_net_flush_tx(q);
1322 }
1323
1324 /* TX */
1325 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1326 {
1327 VirtIONet *n = q->n;
1328 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1329 VirtQueueElement *elem;
1330 int32_t num_packets = 0;
1331 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1332 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1333 return num_packets;
1334 }
1335
1336 if (q->async_tx.elem) {
1337 virtio_queue_set_notification(q->tx_vq, 0);
1338 return num_packets;
1339 }
1340
1341 for (;;) {
1342 ssize_t ret;
1343 unsigned int out_num;
1344 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
1345 struct virtio_net_hdr_mrg_rxbuf mhdr;
1346
1347 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
1348 if (!elem) {
1349 break;
1350 }
1351
1352 out_num = elem->out_num;
1353 out_sg = elem->out_sg;
1354 if (out_num < 1) {
1355 virtio_error(vdev, "virtio-net header not in first element");
1356 virtqueue_detach_element(q->tx_vq, elem, 0);
1357 g_free(elem);
1358 return -EINVAL;
1359 }
1360
1361 if (n->has_vnet_hdr) {
1362 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
1363 n->guest_hdr_len) {
1364 virtio_error(vdev, "virtio-net header incorrect");
1365 virtqueue_detach_element(q->tx_vq, elem, 0);
1366 g_free(elem);
1367 return -EINVAL;
1368 }
1369 if (n->needs_vnet_hdr_swap) {
1370 virtio_net_hdr_swap(vdev, (void *) &mhdr);
1371 sg2[0].iov_base = &mhdr;
1372 sg2[0].iov_len = n->guest_hdr_len;
1373 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
1374 out_sg, out_num,
1375 n->guest_hdr_len, -1);
1376 if (out_num == VIRTQUEUE_MAX_SIZE) {
1377 goto drop;
1378 }
1379 out_num += 1;
1380 out_sg = sg2;
1381 }
1382 }
1383 /*
1384 * If host wants to see the guest header as is, we can
1385 * pass it on unchanged. Otherwise, copy just the parts
1386 * that host is interested in.
1387 */
1388 assert(n->host_hdr_len <= n->guest_hdr_len);
1389 if (n->host_hdr_len != n->guest_hdr_len) {
1390 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1391 out_sg, out_num,
1392 0, n->host_hdr_len);
1393 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1394 out_sg, out_num,
1395 n->guest_hdr_len, -1);
1396 out_num = sg_num;
1397 out_sg = sg;
1398 }
1399
1400 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1401 out_sg, out_num, virtio_net_tx_complete);
1402 if (ret == 0) {
1403 virtio_queue_set_notification(q->tx_vq, 0);
1404 q->async_tx.elem = elem;
1405 return -EBUSY;
1406 }
1407
1408 drop:
1409 virtqueue_push(q->tx_vq, elem, 0);
1410 virtio_notify(vdev, q->tx_vq);
1411 g_free(elem);
1412
1413 if (++num_packets >= n->tx_burst) {
1414 break;
1415 }
1416 }
1417 return num_packets;
1418 }
1419
1420 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1421 {
1422 VirtIONet *n = VIRTIO_NET(vdev);
1423 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1424
1425 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
1426 virtio_net_drop_tx_queue_data(vdev, vq);
1427 return;
1428 }
1429
1430 /* This happens when device was stopped but VCPU wasn't. */
1431 if (!vdev->vm_running) {
1432 q->tx_waiting = 1;
1433 return;
1434 }
1435
1436 if (q->tx_waiting) {
1437 virtio_queue_set_notification(vq, 1);
1438 timer_del(q->tx_timer);
1439 q->tx_waiting = 0;
1440 if (virtio_net_flush_tx(q) == -EINVAL) {
1441 return;
1442 }
1443 } else {
1444 timer_mod(q->tx_timer,
1445 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1446 q->tx_waiting = 1;
1447 virtio_queue_set_notification(vq, 0);
1448 }
1449 }
1450
1451 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1452 {
1453 VirtIONet *n = VIRTIO_NET(vdev);
1454 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1455
1456 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
1457 virtio_net_drop_tx_queue_data(vdev, vq);
1458 return;
1459 }
1460
1461 if (unlikely(q->tx_waiting)) {
1462 return;
1463 }
1464 q->tx_waiting = 1;
1465 /* This happens when device was stopped but VCPU wasn't. */
1466 if (!vdev->vm_running) {
1467 return;
1468 }
1469 virtio_queue_set_notification(vq, 0);
1470 qemu_bh_schedule(q->tx_bh);
1471 }
1472
1473 static void virtio_net_tx_timer(void *opaque)
1474 {
1475 VirtIONetQueue *q = opaque;
1476 VirtIONet *n = q->n;
1477 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1478 /* This happens when device was stopped but BH wasn't. */
1479 if (!vdev->vm_running) {
1480 /* Make sure tx waiting is set, so we'll run when restarted. */
1481 assert(q->tx_waiting);
1482 return;
1483 }
1484
1485 q->tx_waiting = 0;
1486
1487 /* Just in case the driver is not ready on more */
1488 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1489 return;
1490 }
1491
1492 virtio_queue_set_notification(q->tx_vq, 1);
1493 virtio_net_flush_tx(q);
1494 }
1495
1496 static void virtio_net_tx_bh(void *opaque)
1497 {
1498 VirtIONetQueue *q = opaque;
1499 VirtIONet *n = q->n;
1500 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1501 int32_t ret;
1502
1503 /* This happens when device was stopped but BH wasn't. */
1504 if (!vdev->vm_running) {
1505 /* Make sure tx waiting is set, so we'll run when restarted. */
1506 assert(q->tx_waiting);
1507 return;
1508 }
1509
1510 q->tx_waiting = 0;
1511
1512 /* Just in case the driver is not ready on more */
1513 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1514 return;
1515 }
1516
1517 ret = virtio_net_flush_tx(q);
1518 if (ret == -EBUSY || ret == -EINVAL) {
1519 return; /* Notification re-enable handled by tx_complete or device
1520 * broken */
1521 }
1522
1523 /* If we flush a full burst of packets, assume there are
1524 * more coming and immediately reschedule */
1525 if (ret >= n->tx_burst) {
1526 qemu_bh_schedule(q->tx_bh);
1527 q->tx_waiting = 1;
1528 return;
1529 }
1530
1531 /* If less than a full burst, re-enable notification and flush
1532 * anything that may have come in while we weren't looking. If
1533 * we find something, assume the guest is still active and reschedule */
1534 virtio_queue_set_notification(q->tx_vq, 1);
1535 ret = virtio_net_flush_tx(q);
1536 if (ret == -EINVAL) {
1537 return;
1538 } else if (ret > 0) {
1539 virtio_queue_set_notification(q->tx_vq, 0);
1540 qemu_bh_schedule(q->tx_bh);
1541 q->tx_waiting = 1;
1542 }
1543 }
1544
1545 static void virtio_net_add_queue(VirtIONet *n, int index)
1546 {
1547 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1548
1549 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
1550 virtio_net_handle_rx);
1551
1552 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1553 n->vqs[index].tx_vq =
1554 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
1555 virtio_net_handle_tx_timer);
1556 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1557 virtio_net_tx_timer,
1558 &n->vqs[index]);
1559 } else {
1560 n->vqs[index].tx_vq =
1561 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
1562 virtio_net_handle_tx_bh);
1563 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
1564 }
1565
1566 n->vqs[index].tx_waiting = 0;
1567 n->vqs[index].n = n;
1568 }
1569
1570 static void virtio_net_del_queue(VirtIONet *n, int index)
1571 {
1572 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1573 VirtIONetQueue *q = &n->vqs[index];
1574 NetClientState *nc = qemu_get_subqueue(n->nic, index);
1575
1576 qemu_purge_queued_packets(nc);
1577
1578 virtio_del_queue(vdev, index * 2);
1579 if (q->tx_timer) {
1580 timer_del(q->tx_timer);
1581 timer_free(q->tx_timer);
1582 q->tx_timer = NULL;
1583 } else {
1584 qemu_bh_delete(q->tx_bh);
1585 q->tx_bh = NULL;
1586 }
1587 q->tx_waiting = 0;
1588 virtio_del_queue(vdev, index * 2 + 1);
1589 }
1590
1591 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues)
1592 {
1593 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1594 int old_num_queues = virtio_get_num_queues(vdev);
1595 int new_num_queues = new_max_queues * 2 + 1;
1596 int i;
1597
1598 assert(old_num_queues >= 3);
1599 assert(old_num_queues % 2 == 1);
1600
1601 if (old_num_queues == new_num_queues) {
1602 return;
1603 }
1604
1605 /*
1606 * We always need to remove and add ctrl vq if
1607 * old_num_queues != new_num_queues. Remove ctrl_vq first,
1608 * and then we only enter one of the following too loops.
1609 */
1610 virtio_del_queue(vdev, old_num_queues - 1);
1611
1612 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
1613 /* new_num_queues < old_num_queues */
1614 virtio_net_del_queue(n, i / 2);
1615 }
1616
1617 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
1618 /* new_num_queues > old_num_queues */
1619 virtio_net_add_queue(n, i / 2);
1620 }
1621
1622 /* add ctrl_vq last */
1623 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1624 }
1625
1626 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1627 {
1628 int max = multiqueue ? n->max_queues : 1;
1629
1630 n->multiqueue = multiqueue;
1631 virtio_net_change_num_queues(n, max);
1632
1633 virtio_net_set_queues(n);
1634 }
1635
1636 static int virtio_net_post_load_device(void *opaque, int version_id)
1637 {
1638 VirtIONet *n = opaque;
1639 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1640 int i, link_down;
1641
1642 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs,
1643 virtio_vdev_has_feature(vdev,
1644 VIRTIO_F_VERSION_1));
1645
1646 /* MAC_TABLE_ENTRIES may be different from the saved image */
1647 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) {
1648 n->mac_table.in_use = 0;
1649 }
1650
1651 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1652 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1653 }
1654
1655 if (peer_has_vnet_hdr(n)) {
1656 virtio_net_apply_guest_offloads(n);
1657 }
1658
1659 virtio_net_set_queues(n);
1660
1661 /* Find the first multicast entry in the saved MAC filter */
1662 for (i = 0; i < n->mac_table.in_use; i++) {
1663 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1664 break;
1665 }
1666 }
1667 n->mac_table.first_multi = i;
1668
1669 /* nc.link_down can't be migrated, so infer link_down according
1670 * to link status bit in n->status */
1671 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1672 for (i = 0; i < n->max_queues; i++) {
1673 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1674 }
1675
1676 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
1677 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
1678 n->announce_counter = SELF_ANNOUNCE_ROUNDS;
1679 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
1680 }
1681
1682 return 0;
1683 }
1684
1685 /* tx_waiting field of a VirtIONetQueue */
1686 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = {
1687 .name = "virtio-net-queue-tx_waiting",
1688 .fields = (VMStateField[]) {
1689 VMSTATE_UINT32(tx_waiting, VirtIONetQueue),
1690 VMSTATE_END_OF_LIST()
1691 },
1692 };
1693
1694 static bool max_queues_gt_1(void *opaque, int version_id)
1695 {
1696 return VIRTIO_NET(opaque)->max_queues > 1;
1697 }
1698
1699 static bool has_ctrl_guest_offloads(void *opaque, int version_id)
1700 {
1701 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque),
1702 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
1703 }
1704
1705 static bool mac_table_fits(void *opaque, int version_id)
1706 {
1707 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES;
1708 }
1709
1710 static bool mac_table_doesnt_fit(void *opaque, int version_id)
1711 {
1712 return !mac_table_fits(opaque, version_id);
1713 }
1714
1715 /* This temporary type is shared by all the WITH_TMP methods
1716 * although only some fields are used by each.
1717 */
1718 struct VirtIONetMigTmp {
1719 VirtIONet *parent;
1720 VirtIONetQueue *vqs_1;
1721 uint16_t curr_queues_1;
1722 uint8_t has_ufo;
1723 uint32_t has_vnet_hdr;
1724 };
1725
1726 /* The 2nd and subsequent tx_waiting flags are loaded later than
1727 * the 1st entry in the queues and only if there's more than one
1728 * entry. We use the tmp mechanism to calculate a temporary
1729 * pointer and count and also validate the count.
1730 */
1731
1732 static int virtio_net_tx_waiting_pre_save(void *opaque)
1733 {
1734 struct VirtIONetMigTmp *tmp = opaque;
1735
1736 tmp->vqs_1 = tmp->parent->vqs + 1;
1737 tmp->curr_queues_1 = tmp->parent->curr_queues - 1;
1738 if (tmp->parent->curr_queues == 0) {
1739 tmp->curr_queues_1 = 0;
1740 }
1741
1742 return 0;
1743 }
1744
1745 static int virtio_net_tx_waiting_pre_load(void *opaque)
1746 {
1747 struct VirtIONetMigTmp *tmp = opaque;
1748
1749 /* Reuse the pointer setup from save */
1750 virtio_net_tx_waiting_pre_save(opaque);
1751
1752 if (tmp->parent->curr_queues > tmp->parent->max_queues) {
1753 error_report("virtio-net: curr_queues %x > max_queues %x",
1754 tmp->parent->curr_queues, tmp->parent->max_queues);
1755
1756 return -EINVAL;
1757 }
1758
1759 return 0; /* all good */
1760 }
1761
1762 static const VMStateDescription vmstate_virtio_net_tx_waiting = {
1763 .name = "virtio-net-tx_waiting",
1764 .pre_load = virtio_net_tx_waiting_pre_load,
1765 .pre_save = virtio_net_tx_waiting_pre_save,
1766 .fields = (VMStateField[]) {
1767 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp,
1768 curr_queues_1,
1769 vmstate_virtio_net_queue_tx_waiting,
1770 struct VirtIONetQueue),
1771 VMSTATE_END_OF_LIST()
1772 },
1773 };
1774
1775 /* the 'has_ufo' flag is just tested; if the incoming stream has the
1776 * flag set we need to check that we have it
1777 */
1778 static int virtio_net_ufo_post_load(void *opaque, int version_id)
1779 {
1780 struct VirtIONetMigTmp *tmp = opaque;
1781
1782 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) {
1783 error_report("virtio-net: saved image requires TUN_F_UFO support");
1784 return -EINVAL;
1785 }
1786
1787 return 0;
1788 }
1789
1790 static int virtio_net_ufo_pre_save(void *opaque)
1791 {
1792 struct VirtIONetMigTmp *tmp = opaque;
1793
1794 tmp->has_ufo = tmp->parent->has_ufo;
1795
1796 return 0;
1797 }
1798
1799 static const VMStateDescription vmstate_virtio_net_has_ufo = {
1800 .name = "virtio-net-ufo",
1801 .post_load = virtio_net_ufo_post_load,
1802 .pre_save = virtio_net_ufo_pre_save,
1803 .fields = (VMStateField[]) {
1804 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp),
1805 VMSTATE_END_OF_LIST()
1806 },
1807 };
1808
1809 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
1810 * flag set we need to check that we have it
1811 */
1812 static int virtio_net_vnet_post_load(void *opaque, int version_id)
1813 {
1814 struct VirtIONetMigTmp *tmp = opaque;
1815
1816 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) {
1817 error_report("virtio-net: saved image requires vnet_hdr=on");
1818 return -EINVAL;
1819 }
1820
1821 return 0;
1822 }
1823
1824 static int virtio_net_vnet_pre_save(void *opaque)
1825 {
1826 struct VirtIONetMigTmp *tmp = opaque;
1827
1828 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
1829
1830 return 0;
1831 }
1832
1833 static const VMStateDescription vmstate_virtio_net_has_vnet = {
1834 .name = "virtio-net-vnet",
1835 .post_load = virtio_net_vnet_post_load,
1836 .pre_save = virtio_net_vnet_pre_save,
1837 .fields = (VMStateField[]) {
1838 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp),
1839 VMSTATE_END_OF_LIST()
1840 },
1841 };
1842
1843 static const VMStateDescription vmstate_virtio_net_device = {
1844 .name = "virtio-net-device",
1845 .version_id = VIRTIO_NET_VM_VERSION,
1846 .minimum_version_id = VIRTIO_NET_VM_VERSION,
1847 .post_load = virtio_net_post_load_device,
1848 .fields = (VMStateField[]) {
1849 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN),
1850 VMSTATE_STRUCT_POINTER(vqs, VirtIONet,
1851 vmstate_virtio_net_queue_tx_waiting,
1852 VirtIONetQueue),
1853 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet),
1854 VMSTATE_UINT16(status, VirtIONet),
1855 VMSTATE_UINT8(promisc, VirtIONet),
1856 VMSTATE_UINT8(allmulti, VirtIONet),
1857 VMSTATE_UINT32(mac_table.in_use, VirtIONet),
1858
1859 /* Guarded pair: If it fits we load it, else we throw it away
1860 * - can happen if source has a larger MAC table.; post-load
1861 * sets flags in this case.
1862 */
1863 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet,
1864 0, mac_table_fits, mac_table.in_use,
1865 ETH_ALEN),
1866 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0,
1867 mac_table.in_use, ETH_ALEN),
1868
1869 /* Note: This is an array of uint32's that's always been saved as a
1870 * buffer; hold onto your endiannesses; it's actually used as a bitmap
1871 * but based on the uint.
1872 */
1873 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3),
1874 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1875 vmstate_virtio_net_has_vnet),
1876 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet),
1877 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet),
1878 VMSTATE_UINT8(alluni, VirtIONet),
1879 VMSTATE_UINT8(nomulti, VirtIONet),
1880 VMSTATE_UINT8(nouni, VirtIONet),
1881 VMSTATE_UINT8(nobcast, VirtIONet),
1882 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1883 vmstate_virtio_net_has_ufo),
1884 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0,
1885 vmstate_info_uint16_equal, uint16_t),
1886 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1),
1887 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
1888 vmstate_virtio_net_tx_waiting),
1889 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet,
1890 has_ctrl_guest_offloads),
1891 VMSTATE_END_OF_LIST()
1892 },
1893 };
1894
1895 static NetClientInfo net_virtio_info = {
1896 .type = NET_CLIENT_DRIVER_NIC,
1897 .size = sizeof(NICState),
1898 .can_receive = virtio_net_can_receive,
1899 .receive = virtio_net_receive,
1900 .link_status_changed = virtio_net_set_link_status,
1901 .query_rx_filter = virtio_net_query_rxfilter,
1902 };
1903
1904 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1905 {
1906 VirtIONet *n = VIRTIO_NET(vdev);
1907 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1908 assert(n->vhost_started);
1909 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
1910 }
1911
1912 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
1913 bool mask)
1914 {
1915 VirtIONet *n = VIRTIO_NET(vdev);
1916 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1917 assert(n->vhost_started);
1918 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
1919 vdev, idx, mask);
1920 }
1921
1922 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
1923 {
1924 int i, config_size = 0;
1925 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
1926
1927 for (i = 0; feature_sizes[i].flags != 0; i++) {
1928 if (host_features & feature_sizes[i].flags) {
1929 config_size = MAX(feature_sizes[i].end, config_size);
1930 }
1931 }
1932 n->config_size = config_size;
1933 }
1934
1935 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1936 const char *type)
1937 {
1938 /*
1939 * The name can be NULL, the netclient name will be type.x.
1940 */
1941 assert(type != NULL);
1942
1943 g_free(n->netclient_name);
1944 g_free(n->netclient_type);
1945 n->netclient_name = g_strdup(name);
1946 n->netclient_type = g_strdup(type);
1947 }
1948
1949 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
1950 {
1951 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1952 VirtIONet *n = VIRTIO_NET(dev);
1953 NetClientState *nc;
1954 int i;
1955
1956 if (n->net_conf.mtu) {
1957 n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
1958 }
1959
1960 if (n->net_conf.duplex_str) {
1961 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
1962 n->net_conf.duplex = DUPLEX_HALF;
1963 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
1964 n->net_conf.duplex = DUPLEX_FULL;
1965 } else {
1966 error_setg(errp, "'duplex' must be 'half' or 'full'");
1967 }
1968 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
1969 } else {
1970 n->net_conf.duplex = DUPLEX_UNKNOWN;
1971 }
1972
1973 if (n->net_conf.speed < SPEED_UNKNOWN) {
1974 error_setg(errp, "'speed' must be between 0 and INT_MAX");
1975 } else if (n->net_conf.speed >= 0) {
1976 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
1977 }
1978
1979 virtio_net_set_config_size(n, n->host_features);
1980 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
1981
1982 /*
1983 * We set a lower limit on RX queue size to what it always was.
1984 * Guests that want a smaller ring can always resize it without
1985 * help from us (using virtio 1 and up).
1986 */
1987 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||
1988 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||
1989 !is_power_of_2(n->net_conf.rx_queue_size)) {
1990 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "
1991 "must be a power of 2 between %d and %d.",
1992 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,
1993 VIRTQUEUE_MAX_SIZE);
1994 virtio_cleanup(vdev);
1995 return;
1996 }
1997
1998 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE ||
1999 n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE ||
2000 !is_power_of_2(n->net_conf.tx_queue_size)) {
2001 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), "
2002 "must be a power of 2 between %d and %d",
2003 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE,
2004 VIRTQUEUE_MAX_SIZE);
2005 virtio_cleanup(vdev);
2006 return;
2007 }
2008
2009 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
2010 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
2011 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
2012 "must be a positive integer less than %d.",
2013 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
2014 virtio_cleanup(vdev);
2015 return;
2016 }
2017 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
2018 n->curr_queues = 1;
2019 n->tx_timeout = n->net_conf.txtimer;
2020
2021 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
2022 && strcmp(n->net_conf.tx, "bh")) {
2023 error_report("virtio-net: "
2024 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
2025 n->net_conf.tx);
2026 error_report("Defaulting to \"bh\"");
2027 }
2028
2029 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
2030 n->net_conf.tx_queue_size);
2031
2032 for (i = 0; i < n->max_queues; i++) {
2033 virtio_net_add_queue(n, i);
2034 }
2035
2036 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
2037 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
2038 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
2039 n->status = VIRTIO_NET_S_LINK_UP;
2040 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
2041 virtio_net_announce_timer, n);
2042
2043 if (n->netclient_type) {
2044 /*
2045 * Happen when virtio_net_set_netclient_name has been called.
2046 */
2047 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
2048 n->netclient_type, n->netclient_name, n);
2049 } else {
2050 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
2051 object_get_typename(OBJECT(dev)), dev->id, n);
2052 }
2053
2054 peer_test_vnet_hdr(n);
2055 if (peer_has_vnet_hdr(n)) {
2056 for (i = 0; i < n->max_queues; i++) {
2057 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
2058 }
2059 n->host_hdr_len = sizeof(struct virtio_net_hdr);
2060 } else {
2061 n->host_hdr_len = 0;
2062 }
2063
2064 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
2065
2066 n->vqs[0].tx_waiting = 0;
2067 n->tx_burst = n->net_conf.txburst;
2068 virtio_net_set_mrg_rx_bufs(n, 0, 0);
2069 n->promisc = 1; /* for compatibility */
2070
2071 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
2072
2073 n->vlans = g_malloc0(MAX_VLAN >> 3);
2074
2075 nc = qemu_get_queue(n->nic);
2076 nc->rxfilter_notify_enabled = 1;
2077
2078 n->qdev = dev;
2079 }
2080
2081 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
2082 {
2083 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
2084 VirtIONet *n = VIRTIO_NET(dev);
2085 int i, max_queues;
2086
2087 /* This will stop vhost backend if appropriate. */
2088 virtio_net_set_status(vdev, 0);
2089
2090 g_free(n->netclient_name);
2091 n->netclient_name = NULL;
2092 g_free(n->netclient_type);
2093 n->netclient_type = NULL;
2094
2095 g_free(n->mac_table.macs);
2096 g_free(n->vlans);
2097
2098 max_queues = n->multiqueue ? n->max_queues : 1;
2099 for (i = 0; i < max_queues; i++) {
2100 virtio_net_del_queue(n, i);
2101 }
2102
2103 timer_del(n->announce_timer);
2104 timer_free(n->announce_timer);
2105 g_free(n->vqs);
2106 qemu_del_nic(n->nic);
2107 virtio_cleanup(vdev);
2108 }
2109
2110 static void virtio_net_instance_init(Object *obj)
2111 {
2112 VirtIONet *n = VIRTIO_NET(obj);
2113
2114 /*
2115 * The default config_size is sizeof(struct virtio_net_config).
2116 * Can be overriden with virtio_net_set_config_size.
2117 */
2118 n->config_size = sizeof(struct virtio_net_config);
2119 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
2120 "bootindex", "/ethernet-phy@0",
2121 DEVICE(n), NULL);
2122 }
2123
2124 static int virtio_net_pre_save(void *opaque)
2125 {
2126 VirtIONet *n = opaque;
2127
2128 /* At this point, backend must be stopped, otherwise
2129 * it might keep writing to memory. */
2130 assert(!n->vhost_started);
2131
2132 return 0;
2133 }
2134
2135 static const VMStateDescription vmstate_virtio_net = {
2136 .name = "virtio-net",
2137 .minimum_version_id = VIRTIO_NET_VM_VERSION,
2138 .version_id = VIRTIO_NET_VM_VERSION,
2139 .fields = (VMStateField[]) {
2140 VMSTATE_VIRTIO_DEVICE,
2141 VMSTATE_END_OF_LIST()
2142 },
2143 .pre_save = virtio_net_pre_save,
2144 };
2145
2146 static Property virtio_net_properties[] = {
2147 DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
2148 VIRTIO_NET_F_CSUM, true),
2149 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
2150 VIRTIO_NET_F_GUEST_CSUM, true),
2151 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
2152 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
2153 VIRTIO_NET_F_GUEST_TSO4, true),
2154 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
2155 VIRTIO_NET_F_GUEST_TSO6, true),
2156 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
2157 VIRTIO_NET_F_GUEST_ECN, true),
2158 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
2159 VIRTIO_NET_F_GUEST_UFO, true),
2160 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
2161 VIRTIO_NET_F_GUEST_ANNOUNCE, true),
2162 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
2163 VIRTIO_NET_F_HOST_TSO4, true),
2164 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
2165 VIRTIO_NET_F_HOST_TSO6, true),
2166 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
2167 VIRTIO_NET_F_HOST_ECN, true),
2168 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
2169 VIRTIO_NET_F_HOST_UFO, true),
2170 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
2171 VIRTIO_NET_F_MRG_RXBUF, true),
2172 DEFINE_PROP_BIT64("status", VirtIONet, host_features,
2173 VIRTIO_NET_F_STATUS, true),
2174 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
2175 VIRTIO_NET_F_CTRL_VQ, true),
2176 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
2177 VIRTIO_NET_F_CTRL_RX, true),
2178 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
2179 VIRTIO_NET_F_CTRL_VLAN, true),
2180 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
2181 VIRTIO_NET_F_CTRL_RX_EXTRA, true),
2182 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
2183 VIRTIO_NET_F_CTRL_MAC_ADDR, true),
2184 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
2185 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
2186 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
2187 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
2188 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
2189 TX_TIMER_INTERVAL),
2190 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
2191 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
2192 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
2193 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
2194 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
2195 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
2196 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
2197 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
2198 true),
2199 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
2200 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
2201 DEFINE_PROP_END_OF_LIST(),
2202 };
2203
2204 static void virtio_net_class_init(ObjectClass *klass, void *data)
2205 {
2206 DeviceClass *dc = DEVICE_CLASS(klass);
2207 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
2208
2209 dc->props = virtio_net_properties;
2210 dc->vmsd = &vmstate_virtio_net;
2211 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
2212 vdc->realize = virtio_net_device_realize;
2213 vdc->unrealize = virtio_net_device_unrealize;
2214 vdc->get_config = virtio_net_get_config;
2215 vdc->set_config = virtio_net_set_config;
2216 vdc->get_features = virtio_net_get_features;
2217 vdc->set_features = virtio_net_set_features;
2218 vdc->bad_features = virtio_net_bad_features;
2219 vdc->reset = virtio_net_reset;
2220 vdc->set_status = virtio_net_set_status;
2221 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
2222 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
2223 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
2224 vdc->vmsd = &vmstate_virtio_net_device;
2225 }
2226
2227 static const TypeInfo virtio_net_info = {
2228 .name = TYPE_VIRTIO_NET,
2229 .parent = TYPE_VIRTIO_DEVICE,
2230 .instance_size = sizeof(VirtIONet),
2231 .instance_init = virtio_net_instance_init,
2232 .class_init = virtio_net_class_init,
2233 };
2234
2235 static void virtio_register_types(void)
2236 {
2237 type_register_static(&virtio_net_info);
2238 }
2239
2240 type_init(virtio_register_types)
AR7 emulation for QEMU