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bitops.h: Provide hswap32(), hswap64(), wswap64() swapping operations
[qemu/ar7.git] / hw / net / virtio-net.c
blobbd7958b9f0eed2705e0d6a2feaeaefb5e63bd6a4
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/atomic.h"
16 #include "qemu/iov.h"
17 #include "qemu/main-loop.h"
18 #include "qemu/module.h"
19 #include "hw/virtio/virtio.h"
20 #include "net/net.h"
21 #include "net/checksum.h"
22 #include "net/tap.h"
23 #include "qemu/error-report.h"
24 #include "qemu/timer.h"
25 #include "qemu/option.h"
26 #include "qemu/option_int.h"
27 #include "qemu/config-file.h"
28 #include "qapi/qmp/qdict.h"
29 #include "hw/virtio/virtio-net.h"
30 #include "net/vhost_net.h"
31 #include "net/announce.h"
32 #include "hw/virtio/virtio-bus.h"
33 #include "qapi/error.h"
34 #include "qapi/qapi-events-net.h"
35 #include "hw/qdev-properties.h"
36 #include "qapi/qapi-types-migration.h"
37 #include "qapi/qapi-events-migration.h"
38 #include "hw/virtio/virtio-access.h"
39 #include "migration/misc.h"
40 #include "standard-headers/linux/ethtool.h"
41 #include "sysemu/sysemu.h"
42 #include "trace.h"
43 #include "monitor/qdev.h"
44 #include "hw/pci/pci.h"
45 #include "net_rx_pkt.h"
46 #include "hw/virtio/vhost.h"
47
48 #define VIRTIO_NET_VM_VERSION 11
49
50 #define MAC_TABLE_ENTRIES 64
51 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
52
53 /* previously fixed value */
54 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
55 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256
56
57 /* for now, only allow larger queues; with virtio-1, guest can downsize */
58 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
59 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
60
61 #define VIRTIO_NET_IP4_ADDR_SIZE 8 /* ipv4 saddr + daddr */
62
63 #define VIRTIO_NET_TCP_FLAG 0x3F
64 #define VIRTIO_NET_TCP_HDR_LENGTH 0xF000
65
66 /* IPv4 max payload, 16 bits in the header */
67 #define VIRTIO_NET_MAX_IP4_PAYLOAD (65535 - sizeof(struct ip_header))
68 #define VIRTIO_NET_MAX_TCP_PAYLOAD 65535
69
70 /* header length value in ip header without option */
71 #define VIRTIO_NET_IP4_HEADER_LENGTH 5
72
73 #define VIRTIO_NET_IP6_ADDR_SIZE 32 /* ipv6 saddr + daddr */
74 #define VIRTIO_NET_MAX_IP6_PAYLOAD VIRTIO_NET_MAX_TCP_PAYLOAD
75
76 /* Purge coalesced packets timer interval, This value affects the performance
77 a lot, and should be tuned carefully, '300000'(300us) is the recommended
78 value to pass the WHQL test, '50000' can gain 2x netperf throughput with
79 tso/gso/gro 'off'. */
80 #define VIRTIO_NET_RSC_DEFAULT_INTERVAL 300000
81
82 #define VIRTIO_NET_RSS_SUPPORTED_HASHES (VIRTIO_NET_RSS_HASH_TYPE_IPv4 | \
83 VIRTIO_NET_RSS_HASH_TYPE_TCPv4 | \
84 VIRTIO_NET_RSS_HASH_TYPE_UDPv4 | \
85 VIRTIO_NET_RSS_HASH_TYPE_IPv6 | \
86 VIRTIO_NET_RSS_HASH_TYPE_TCPv6 | \
87 VIRTIO_NET_RSS_HASH_TYPE_UDPv6 | \
88 VIRTIO_NET_RSS_HASH_TYPE_IP_EX | \
89 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | \
90 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX)
91
92 static const VirtIOFeature feature_sizes[] = {
93 {.flags = 1ULL << VIRTIO_NET_F_MAC,
94 .end = endof(struct virtio_net_config, mac)},
95 {.flags = 1ULL << VIRTIO_NET_F_STATUS,
96 .end = endof(struct virtio_net_config, status)},
97 {.flags = 1ULL << VIRTIO_NET_F_MQ,
98 .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
99 {.flags = 1ULL << VIRTIO_NET_F_MTU,
100 .end = endof(struct virtio_net_config, mtu)},
101 {.flags = 1ULL << VIRTIO_NET_F_SPEED_DUPLEX,
102 .end = endof(struct virtio_net_config, duplex)},
103 {.flags = (1ULL << VIRTIO_NET_F_RSS) | (1ULL << VIRTIO_NET_F_HASH_REPORT),
104 .end = endof(struct virtio_net_config, supported_hash_types)},
105 {}
106 };
107
108 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
109 {
110 VirtIONet *n = qemu_get_nic_opaque(nc);
111
112 return &n->vqs[nc->queue_index];
113 }
114
115 static int vq2q(int queue_index)
116 {
117 return queue_index / 2;
118 }
119
120 /* TODO
121 * - we could suppress RX interrupt if we were so inclined.
122 */
123
124 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
125 {
126 VirtIONet *n = VIRTIO_NET(vdev);
127 struct virtio_net_config netcfg;
128 NetClientState *nc = qemu_get_queue(n->nic);
129 static const MACAddr zero = { .a = { 0, 0, 0, 0, 0, 0 } };
130
131 int ret = 0;
132 memset(&netcfg, 0 , sizeof(struct virtio_net_config));
133 virtio_stw_p(vdev, &netcfg.status, n->status);
134 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
135 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
136 memcpy(netcfg.mac, n->mac, ETH_ALEN);
137 virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
138 netcfg.duplex = n->net_conf.duplex;
139 netcfg.rss_max_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
140 virtio_stw_p(vdev, &netcfg.rss_max_indirection_table_length,
141 virtio_host_has_feature(vdev, VIRTIO_NET_F_RSS) ?
142 VIRTIO_NET_RSS_MAX_TABLE_LEN : 1);
143 virtio_stl_p(vdev, &netcfg.supported_hash_types,
144 VIRTIO_NET_RSS_SUPPORTED_HASHES);
145 memcpy(config, &netcfg, n->config_size);
146
147 /*
148 * Is this VDPA? No peer means not VDPA: there's no way to
149 * disconnect/reconnect a VDPA peer.
150 */
151 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
152 ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
153 n->config_size);
154 if (ret != -1) {
155 /*
156 * Some NIC/kernel combinations present 0 as the mac address. As
157 * that is not a legal address, try to proceed with the
158 * address from the QEMU command line in the hope that the
159 * address has been configured correctly elsewhere - just not
160 * reported by the device.
161 */
162 if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) {
163 info_report("Zero hardware mac address detected. Ignoring.");
164 memcpy(netcfg.mac, n->mac, ETH_ALEN);
165 }
166 memcpy(config, &netcfg, n->config_size);
167 }
168 }
169 }
170
171 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
172 {
173 VirtIONet *n = VIRTIO_NET(vdev);
174 struct virtio_net_config netcfg = {};
175 NetClientState *nc = qemu_get_queue(n->nic);
176
177 memcpy(&netcfg, config, n->config_size);
178
179 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
180 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
181 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
182 memcpy(n->mac, netcfg.mac, ETH_ALEN);
183 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
184 }
185
186 /*
187 * Is this VDPA? No peer means not VDPA: there's no way to
188 * disconnect/reconnect a VDPA peer.
189 */
190 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
191 vhost_net_set_config(get_vhost_net(nc->peer),
192 (uint8_t *)&netcfg, 0, n->config_size,
193 VHOST_SET_CONFIG_TYPE_MASTER);
194 }
195 }
196
197 static bool virtio_net_started(VirtIONet *n, uint8_t status)
198 {
199 VirtIODevice *vdev = VIRTIO_DEVICE(n);
200 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
201 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
202 }
203
204 static void virtio_net_announce_notify(VirtIONet *net)
205 {
206 VirtIODevice *vdev = VIRTIO_DEVICE(net);
207 trace_virtio_net_announce_notify();
208
209 net->status |= VIRTIO_NET_S_ANNOUNCE;
210 virtio_notify_config(vdev);
211 }
212
213 static void virtio_net_announce_timer(void *opaque)
214 {
215 VirtIONet *n = opaque;
216 trace_virtio_net_announce_timer(n->announce_timer.round);
217
218 n->announce_timer.round--;
219 virtio_net_announce_notify(n);
220 }
221
222 static void virtio_net_announce(NetClientState *nc)
223 {
224 VirtIONet *n = qemu_get_nic_opaque(nc);
225 VirtIODevice *vdev = VIRTIO_DEVICE(n);
226
227 /*
228 * Make sure the virtio migration announcement timer isn't running
229 * If it is, let it trigger announcement so that we do not cause
230 * confusion.
231 */
232 if (n->announce_timer.round) {
233 return;
234 }
235
236 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
237 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
238 virtio_net_announce_notify(n);
239 }
240 }
241
242 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
243 {
244 VirtIODevice *vdev = VIRTIO_DEVICE(n);
245 NetClientState *nc = qemu_get_queue(n->nic);
246 int queues = n->multiqueue ? n->max_queues : 1;
247
248 if (!get_vhost_net(nc->peer)) {
249 return;
250 }
251
252 if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
253 !!n->vhost_started) {
254 return;
255 }
256 if (!n->vhost_started) {
257 int r, i;
258
259 if (n->needs_vnet_hdr_swap) {
260 error_report("backend does not support %s vnet headers; "
261 "falling back on userspace virtio",
262 virtio_is_big_endian(vdev) ? "BE" : "LE");
263 return;
264 }
265
266 /* Any packets outstanding? Purge them to avoid touching rings
267 * when vhost is running.
268 */
269 for (i = 0; i < queues; i++) {
270 NetClientState *qnc = qemu_get_subqueue(n->nic, i);
271
272 /* Purge both directions: TX and RX. */
273 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
274 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
275 }
276
277 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) {
278 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu);
279 if (r < 0) {
280 error_report("%uBytes MTU not supported by the backend",
281 n->net_conf.mtu);
282
283 return;
284 }
285 }
286
287 n->vhost_started = 1;
288 r = vhost_net_start(vdev, n->nic->ncs, queues);
289 if (r < 0) {
290 error_report("unable to start vhost net: %d: "
291 "falling back on userspace virtio", -r);
292 n->vhost_started = 0;
293 }
294 } else {
295 vhost_net_stop(vdev, n->nic->ncs, queues);
296 n->vhost_started = 0;
297 }
298 }
299
300 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev,
301 NetClientState *peer,
302 bool enable)
303 {
304 if (virtio_is_big_endian(vdev)) {
305 return qemu_set_vnet_be(peer, enable);
306 } else {
307 return qemu_set_vnet_le(peer, enable);
308 }
309 }
310
311 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs,
312 int queues, bool enable)
313 {
314 int i;
315
316 for (i = 0; i < queues; i++) {
317 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 &&
318 enable) {
319 while (--i >= 0) {
320 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false);
321 }
322
323 return true;
324 }
325 }
326
327 return false;
328 }
329
330 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status)
331 {
332 VirtIODevice *vdev = VIRTIO_DEVICE(n);
333 int queues = n->multiqueue ? n->max_queues : 1;
334
335 if (virtio_net_started(n, status)) {
336 /* Before using the device, we tell the network backend about the
337 * endianness to use when parsing vnet headers. If the backend
338 * can't do it, we fallback onto fixing the headers in the core
339 * virtio-net code.
340 */
341 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs,
342 queues, true);
343 } else if (virtio_net_started(n, vdev->status)) {
344 /* After using the device, we need to reset the network backend to
345 * the default (guest native endianness), otherwise the guest may
346 * lose network connectivity if it is rebooted into a different
347 * endianness.
348 */
349 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queues, false);
350 }
351 }
352
353 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq)
354 {
355 unsigned int dropped = virtqueue_drop_all(vq);
356 if (dropped) {
357 virtio_notify(vdev, vq);
358 }
359 }
360
361 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
362 {
363 VirtIONet *n = VIRTIO_NET(vdev);
364 VirtIONetQueue *q;
365 int i;
366 uint8_t queue_status;
367
368 virtio_net_vnet_endian_status(n, status);
369 virtio_net_vhost_status(n, status);
370
371 for (i = 0; i < n->max_queues; i++) {
372 NetClientState *ncs = qemu_get_subqueue(n->nic, i);
373 bool queue_started;
374 q = &n->vqs[i];
375
376 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
377 queue_status = 0;
378 } else {
379 queue_status = status;
380 }
381 queue_started =
382 virtio_net_started(n, queue_status) && !n->vhost_started;
383
384 if (queue_started) {
385 qemu_flush_queued_packets(ncs);
386 }
387
388 if (!q->tx_waiting) {
389 continue;
390 }
391
392 if (queue_started) {
393 if (q->tx_timer) {
394 timer_mod(q->tx_timer,
395 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
396 } else {
397 qemu_bh_schedule(q->tx_bh);
398 }
399 } else {
400 if (q->tx_timer) {
401 timer_del(q->tx_timer);
402 } else {
403 qemu_bh_cancel(q->tx_bh);
404 }
405 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
406 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) &&
407 vdev->vm_running) {
408 /* if tx is waiting we are likely have some packets in tx queue
409 * and disabled notification */
410 q->tx_waiting = 0;
411 virtio_queue_set_notification(q->tx_vq, 1);
412 virtio_net_drop_tx_queue_data(vdev, q->tx_vq);
413 }
414 }
415 }
416 }
417
418 static void virtio_net_set_link_status(NetClientState *nc)
419 {
420 VirtIONet *n = qemu_get_nic_opaque(nc);
421 VirtIODevice *vdev = VIRTIO_DEVICE(n);
422 uint16_t old_status = n->status;
423
424 if (nc->link_down)
425 n->status &= ~VIRTIO_NET_S_LINK_UP;
426 else
427 n->status |= VIRTIO_NET_S_LINK_UP;
428
429 if (n->status != old_status)
430 virtio_notify_config(vdev);
431
432 virtio_net_set_status(vdev, vdev->status);
433 }
434
435 static void rxfilter_notify(NetClientState *nc)
436 {
437 VirtIONet *n = qemu_get_nic_opaque(nc);
438
439 if (nc->rxfilter_notify_enabled) {
440 char *path = object_get_canonical_path(OBJECT(n->qdev));
441 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
442 n->netclient_name, path);
443 g_free(path);
444
445 /* disable event notification to avoid events flooding */
446 nc->rxfilter_notify_enabled = 0;
447 }
448 }
449
450 static intList *get_vlan_table(VirtIONet *n)
451 {
452 intList *list;
453 int i, j;
454
455 list = NULL;
456 for (i = 0; i < MAX_VLAN >> 5; i++) {
457 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
458 if (n->vlans[i] & (1U << j)) {
459 QAPI_LIST_PREPEND(list, (i << 5) + j);
460 }
461 }
462 }
463
464 return list;
465 }
466
467 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
468 {
469 VirtIONet *n = qemu_get_nic_opaque(nc);
470 VirtIODevice *vdev = VIRTIO_DEVICE(n);
471 RxFilterInfo *info;
472 strList *str_list;
473 int i;
474
475 info = g_malloc0(sizeof(*info));
476 info->name = g_strdup(nc->name);
477 info->promiscuous = n->promisc;
478
479 if (n->nouni) {
480 info->unicast = RX_STATE_NONE;
481 } else if (n->alluni) {
482 info->unicast = RX_STATE_ALL;
483 } else {
484 info->unicast = RX_STATE_NORMAL;
485 }
486
487 if (n->nomulti) {
488 info->multicast = RX_STATE_NONE;
489 } else if (n->allmulti) {
490 info->multicast = RX_STATE_ALL;
491 } else {
492 info->multicast = RX_STATE_NORMAL;
493 }
494
495 info->broadcast_allowed = n->nobcast;
496 info->multicast_overflow = n->mac_table.multi_overflow;
497 info->unicast_overflow = n->mac_table.uni_overflow;
498
499 info->main_mac = qemu_mac_strdup_printf(n->mac);
500
501 str_list = NULL;
502 for (i = 0; i < n->mac_table.first_multi; i++) {
503 QAPI_LIST_PREPEND(str_list,
504 qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN));
505 }
506 info->unicast_table = str_list;
507
508 str_list = NULL;
509 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
510 QAPI_LIST_PREPEND(str_list,
511 qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN));
512 }
513 info->multicast_table = str_list;
514 info->vlan_table = get_vlan_table(n);
515
516 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
517 info->vlan = RX_STATE_ALL;
518 } else if (!info->vlan_table) {
519 info->vlan = RX_STATE_NONE;
520 } else {
521 info->vlan = RX_STATE_NORMAL;
522 }
523
524 /* enable event notification after query */
525 nc->rxfilter_notify_enabled = 1;
526
527 return info;
528 }
529
530 static void virtio_net_reset(VirtIODevice *vdev)
531 {
532 VirtIONet *n = VIRTIO_NET(vdev);
533 int i;
534
535 /* Reset back to compatibility mode */
536 n->promisc = 1;
537 n->allmulti = 0;
538 n->alluni = 0;
539 n->nomulti = 0;
540 n->nouni = 0;
541 n->nobcast = 0;
542 /* multiqueue is disabled by default */
543 n->curr_queues = 1;
544 timer_del(n->announce_timer.tm);
545 n->announce_timer.round = 0;
546 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
547
548 /* Flush any MAC and VLAN filter table state */
549 n->mac_table.in_use = 0;
550 n->mac_table.first_multi = 0;
551 n->mac_table.multi_overflow = 0;
552 n->mac_table.uni_overflow = 0;
553 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
554 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
555 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
556 memset(n->vlans, 0, MAX_VLAN >> 3);
557
558 /* Flush any async TX */
559 for (i = 0; i < n->max_queues; i++) {
560 NetClientState *nc = qemu_get_subqueue(n->nic, i);
561
562 if (nc->peer) {
563 qemu_flush_or_purge_queued_packets(nc->peer, true);
564 assert(!virtio_net_get_subqueue(nc)->async_tx.elem);
565 }
566 }
567 }
568
569 static void peer_test_vnet_hdr(VirtIONet *n)
570 {
571 NetClientState *nc = qemu_get_queue(n->nic);
572 if (!nc->peer) {
573 return;
574 }
575
576 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
577 }
578
579 static int peer_has_vnet_hdr(VirtIONet *n)
580 {
581 return n->has_vnet_hdr;
582 }
583
584 static int peer_has_ufo(VirtIONet *n)
585 {
586 if (!peer_has_vnet_hdr(n))
587 return 0;
588
589 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
590
591 return n->has_ufo;
592 }
593
594 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
595 int version_1, int hash_report)
596 {
597 int i;
598 NetClientState *nc;
599
600 n->mergeable_rx_bufs = mergeable_rx_bufs;
601
602 if (version_1) {
603 n->guest_hdr_len = hash_report ?
604 sizeof(struct virtio_net_hdr_v1_hash) :
605 sizeof(struct virtio_net_hdr_mrg_rxbuf);
606 n->rss_data.populate_hash = !!hash_report;
607 } else {
608 n->guest_hdr_len = n->mergeable_rx_bufs ?
609 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
610 sizeof(struct virtio_net_hdr);
611 }
612
613 for (i = 0; i < n->max_queues; i++) {
614 nc = qemu_get_subqueue(n->nic, i);
615
616 if (peer_has_vnet_hdr(n) &&
617 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
618 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
619 n->host_hdr_len = n->guest_hdr_len;
620 }
621 }
622 }
623
624 static int virtio_net_max_tx_queue_size(VirtIONet *n)
625 {
626 NetClientState *peer = n->nic_conf.peers.ncs[0];
627
628 /*
629 * Backends other than vhost-user don't support max queue size.
630 */
631 if (!peer) {
632 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
633 }
634
635 if (peer->info->type != NET_CLIENT_DRIVER_VHOST_USER) {
636 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
637 }
638
639 return VIRTQUEUE_MAX_SIZE;
640 }
641
642 static int peer_attach(VirtIONet *n, int index)
643 {
644 NetClientState *nc = qemu_get_subqueue(n->nic, index);
645
646 if (!nc->peer) {
647 return 0;
648 }
649
650 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
651 vhost_set_vring_enable(nc->peer, 1);
652 }
653
654 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
655 return 0;
656 }
657
658 if (n->max_queues == 1) {
659 return 0;
660 }
661
662 return tap_enable(nc->peer);
663 }
664
665 static int peer_detach(VirtIONet *n, int index)
666 {
667 NetClientState *nc = qemu_get_subqueue(n->nic, index);
668
669 if (!nc->peer) {
670 return 0;
671 }
672
673 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
674 vhost_set_vring_enable(nc->peer, 0);
675 }
676
677 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
678 return 0;
679 }
680
681 return tap_disable(nc->peer);
682 }
683
684 static void virtio_net_set_queues(VirtIONet *n)
685 {
686 int i;
687 int r;
688
689 if (n->nic->peer_deleted) {
690 return;
691 }
692
693 for (i = 0; i < n->max_queues; i++) {
694 if (i < n->curr_queues) {
695 r = peer_attach(n, i);
696 assert(!r);
697 } else {
698 r = peer_detach(n, i);
699 assert(!r);
700 }
701 }
702 }
703
704 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
705
706 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
707 Error **errp)
708 {
709 VirtIONet *n = VIRTIO_NET(vdev);
710 NetClientState *nc = qemu_get_queue(n->nic);
711
712 /* Firstly sync all virtio-net possible supported features */
713 features |= n->host_features;
714
715 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
716
717 if (!peer_has_vnet_hdr(n)) {
718 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
719 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
720 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
721 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
722
723 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
724 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
725 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
726 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
727
728 virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
729 }
730
731 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
732 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
733 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
734 }
735
736 if (!get_vhost_net(nc->peer)) {
737 return features;
738 }
739
740 if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
741 virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
742 }
743 features = vhost_net_get_features(get_vhost_net(nc->peer), features);
744 vdev->backend_features = features;
745
746 if (n->mtu_bypass_backend &&
747 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
748 features |= (1ULL << VIRTIO_NET_F_MTU);
749 }
750
751 return features;
752 }
753
754 static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
755 {
756 uint64_t features = 0;
757
758 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
759 * but also these: */
760 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
761 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
762 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
763 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
764 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
765
766 return features;
767 }
768
769 static void virtio_net_apply_guest_offloads(VirtIONet *n)
770 {
771 qemu_set_offload(qemu_get_queue(n->nic)->peer,
772 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
773 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
774 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
775 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
776 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
777 }
778
779 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
780 {
781 static const uint64_t guest_offloads_mask =
782 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
783 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
784 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
785 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
786 (1ULL << VIRTIO_NET_F_GUEST_UFO);
787
788 return guest_offloads_mask & features;
789 }
790
791 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
792 {
793 VirtIODevice *vdev = VIRTIO_DEVICE(n);
794 return virtio_net_guest_offloads_by_features(vdev->guest_features);
795 }
796
797 typedef struct {
798 VirtIONet *n;
799 char *id;
800 } FailoverId;
801
802 /**
803 * Set the id of the failover primary device
804 *
805 * @opaque: FailoverId to setup
806 * @opts: opts for device we are handling
807 * @errp: returns an error if this function fails
808 */
809 static int failover_set_primary(void *opaque, QemuOpts *opts, Error **errp)
810 {
811 FailoverId *fid = opaque;
812 const char *standby_id = qemu_opt_get(opts, "failover_pair_id");
813
814 if (g_strcmp0(standby_id, fid->n->netclient_name) == 0) {
815 fid->id = g_strdup(opts->id);
816 return 1;
817 }
818
819 return 0;
820 }
821
822 /**
823 * Find the primary device id for this failover virtio-net
824 *
825 * @n: VirtIONet device
826 * @errp: returns an error if this function fails
827 */
828 static char *failover_find_primary_device_id(VirtIONet *n)
829 {
830 Error *err = NULL;
831 FailoverId fid;
832
833 fid.n = n;
834 if (!qemu_opts_foreach(qemu_find_opts("device"),
835 failover_set_primary, &fid, &err)) {
836 return NULL;
837 }
838 return fid.id;
839 }
840
841 /**
842 * Find the primary device for this failover virtio-net
843 *
844 * @n: VirtIONet device
845 * @errp: returns an error if this function fails
846 */
847 static DeviceState *failover_find_primary_device(VirtIONet *n)
848 {
849 char *id = failover_find_primary_device_id(n);
850
851 if (!id) {
852 return NULL;
853 }
854
855 return qdev_find_recursive(sysbus_get_default(), id);
856 }
857
858 static void failover_add_primary(VirtIONet *n, Error **errp)
859 {
860 Error *err = NULL;
861 QemuOpts *opts;
862 char *id;
863 DeviceState *dev = failover_find_primary_device(n);
864
865 if (dev) {
866 return;
867 }
868
869 id = failover_find_primary_device_id(n);
870 if (!id) {
871 error_setg(errp, "Primary device not found");
872 error_append_hint(errp, "Virtio-net failover will not work. Make "
873 "sure primary device has parameter"
874 " failover_pair_id=%s\n", n->netclient_name);
875 return;
876 }
877 opts = qemu_opts_find(qemu_find_opts("device"), id);
878 g_assert(opts); /* cannot be NULL because id was found using opts list */
879 dev = qdev_device_add(opts, &err);
880 if (err) {
881 qemu_opts_del(opts);
882 } else {
883 object_unref(OBJECT(dev));
884 }
885 error_propagate(errp, err);
886 }
887
888 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
889 {
890 VirtIONet *n = VIRTIO_NET(vdev);
891 Error *err = NULL;
892 int i;
893
894 if (n->mtu_bypass_backend &&
895 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) {
896 features &= ~(1ULL << VIRTIO_NET_F_MTU);
897 }
898
899 virtio_net_set_multiqueue(n,
900 virtio_has_feature(features, VIRTIO_NET_F_RSS) ||
901 virtio_has_feature(features, VIRTIO_NET_F_MQ));
902
903 virtio_net_set_mrg_rx_bufs(n,
904 virtio_has_feature(features,
905 VIRTIO_NET_F_MRG_RXBUF),
906 virtio_has_feature(features,
907 VIRTIO_F_VERSION_1),
908 virtio_has_feature(features,
909 VIRTIO_NET_F_HASH_REPORT));
910
911 n->rsc4_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) &&
912 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO4);
913 n->rsc6_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) &&
914 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO6);
915 n->rss_data.redirect = virtio_has_feature(features, VIRTIO_NET_F_RSS);
916
917 if (n->has_vnet_hdr) {
918 n->curr_guest_offloads =
919 virtio_net_guest_offloads_by_features(features);
920 virtio_net_apply_guest_offloads(n);
921 }
922
923 for (i = 0; i < n->max_queues; i++) {
924 NetClientState *nc = qemu_get_subqueue(n->nic, i);
925
926 if (!get_vhost_net(nc->peer)) {
927 continue;
928 }
929 vhost_net_ack_features(get_vhost_net(nc->peer), features);
930 }
931
932 if (virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
933 memset(n->vlans, 0, MAX_VLAN >> 3);
934 } else {
935 memset(n->vlans, 0xff, MAX_VLAN >> 3);
936 }
937
938 if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) {
939 qapi_event_send_failover_negotiated(n->netclient_name);
940 qatomic_set(&n->failover_primary_hidden, false);
941 failover_add_primary(n, &err);
942 if (err) {
943 warn_report_err(err);
944 }
945 }
946 }
947
948 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
949 struct iovec *iov, unsigned int iov_cnt)
950 {
951 uint8_t on;
952 size_t s;
953 NetClientState *nc = qemu_get_queue(n->nic);
954
955 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
956 if (s != sizeof(on)) {
957 return VIRTIO_NET_ERR;
958 }
959
960 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
961 n->promisc = on;
962 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
963 n->allmulti = on;
964 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
965 n->alluni = on;
966 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
967 n->nomulti = on;
968 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
969 n->nouni = on;
970 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
971 n->nobcast = on;
972 } else {
973 return VIRTIO_NET_ERR;
974 }
975
976 rxfilter_notify(nc);
977
978 return VIRTIO_NET_OK;
979 }
980
981 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
982 struct iovec *iov, unsigned int iov_cnt)
983 {
984 VirtIODevice *vdev = VIRTIO_DEVICE(n);
985 uint64_t offloads;
986 size_t s;
987
988 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
989 return VIRTIO_NET_ERR;
990 }
991
992 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
993 if (s != sizeof(offloads)) {
994 return VIRTIO_NET_ERR;
995 }
996
997 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
998 uint64_t supported_offloads;
999
1000 offloads = virtio_ldq_p(vdev, &offloads);
1001
1002 if (!n->has_vnet_hdr) {
1003 return VIRTIO_NET_ERR;
1004 }
1005
1006 n->rsc4_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) &&
1007 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO4);
1008 n->rsc6_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) &&
1009 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO6);
1010 virtio_clear_feature(&offloads, VIRTIO_NET_F_RSC_EXT);
1011
1012 supported_offloads = virtio_net_supported_guest_offloads(n);
1013 if (offloads & ~supported_offloads) {
1014 return VIRTIO_NET_ERR;
1015 }
1016
1017 n->curr_guest_offloads = offloads;
1018 virtio_net_apply_guest_offloads(n);
1019
1020 return VIRTIO_NET_OK;
1021 } else {
1022 return VIRTIO_NET_ERR;
1023 }
1024 }
1025
1026 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
1027 struct iovec *iov, unsigned int iov_cnt)
1028 {
1029 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1030 struct virtio_net_ctrl_mac mac_data;
1031 size_t s;
1032 NetClientState *nc = qemu_get_queue(n->nic);
1033
1034 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
1035 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
1036 return VIRTIO_NET_ERR;
1037 }
1038 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
1039 assert(s == sizeof(n->mac));
1040 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
1041 rxfilter_notify(nc);
1042
1043 return VIRTIO_NET_OK;
1044 }
1045
1046 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
1047 return VIRTIO_NET_ERR;
1048 }
1049
1050 int in_use = 0;
1051 int first_multi = 0;
1052 uint8_t uni_overflow = 0;
1053 uint8_t multi_overflow = 0;
1054 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1055
1056 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
1057 sizeof(mac_data.entries));
1058 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
1059 if (s != sizeof(mac_data.entries)) {
1060 goto error;
1061 }
1062 iov_discard_front(&iov, &iov_cnt, s);
1063
1064 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
1065 goto error;
1066 }
1067
1068 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
1069 s = iov_to_buf(iov, iov_cnt, 0, macs,
1070 mac_data.entries * ETH_ALEN);
1071 if (s != mac_data.entries * ETH_ALEN) {
1072 goto error;
1073 }
1074 in_use += mac_data.entries;
1075 } else {
1076 uni_overflow = 1;
1077 }
1078
1079 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
1080
1081 first_multi = in_use;
1082
1083 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
1084 sizeof(mac_data.entries));
1085 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
1086 if (s != sizeof(mac_data.entries)) {
1087 goto error;
1088 }
1089
1090 iov_discard_front(&iov, &iov_cnt, s);
1091
1092 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
1093 goto error;
1094 }
1095
1096 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
1097 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
1098 mac_data.entries * ETH_ALEN);
1099 if (s != mac_data.entries * ETH_ALEN) {
1100 goto error;
1101 }
1102 in_use += mac_data.entries;
1103 } else {
1104 multi_overflow = 1;
1105 }
1106
1107 n->mac_table.in_use = in_use;
1108 n->mac_table.first_multi = first_multi;
1109 n->mac_table.uni_overflow = uni_overflow;
1110 n->mac_table.multi_overflow = multi_overflow;
1111 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
1112 g_free(macs);
1113 rxfilter_notify(nc);
1114
1115 return VIRTIO_NET_OK;
1116
1117 error:
1118 g_free(macs);
1119 return VIRTIO_NET_ERR;
1120 }
1121
1122 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
1123 struct iovec *iov, unsigned int iov_cnt)
1124 {
1125 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1126 uint16_t vid;
1127 size_t s;
1128 NetClientState *nc = qemu_get_queue(n->nic);
1129
1130 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
1131 vid = virtio_lduw_p(vdev, &vid);
1132 if (s != sizeof(vid)) {
1133 return VIRTIO_NET_ERR;
1134 }
1135
1136 if (vid >= MAX_VLAN)
1137 return VIRTIO_NET_ERR;
1138
1139 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
1140 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
1141 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
1142 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
1143 else
1144 return VIRTIO_NET_ERR;
1145
1146 rxfilter_notify(nc);
1147
1148 return VIRTIO_NET_OK;
1149 }
1150
1151 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
1152 struct iovec *iov, unsigned int iov_cnt)
1153 {
1154 trace_virtio_net_handle_announce(n->announce_timer.round);
1155 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
1156 n->status & VIRTIO_NET_S_ANNOUNCE) {
1157 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
1158 if (n->announce_timer.round) {
1159 qemu_announce_timer_step(&n->announce_timer);
1160 }
1161 return VIRTIO_NET_OK;
1162 } else {
1163 return VIRTIO_NET_ERR;
1164 }
1165 }
1166
1167 static void virtio_net_detach_epbf_rss(VirtIONet *n);
1168
1169 static void virtio_net_disable_rss(VirtIONet *n)
1170 {
1171 if (n->rss_data.enabled) {
1172 trace_virtio_net_rss_disable();
1173 }
1174 n->rss_data.enabled = false;
1175
1176 virtio_net_detach_epbf_rss(n);
1177 }
1178
1179 static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd)
1180 {
1181 NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0);
1182 if (nc == NULL || nc->info->set_steering_ebpf == NULL) {
1183 return false;
1184 }
1185
1186 return nc->info->set_steering_ebpf(nc, prog_fd);
1187 }
1188
1189 static void rss_data_to_rss_config(struct VirtioNetRssData *data,
1190 struct EBPFRSSConfig *config)
1191 {
1192 config->redirect = data->redirect;
1193 config->populate_hash = data->populate_hash;
1194 config->hash_types = data->hash_types;
1195 config->indirections_len = data->indirections_len;
1196 config->default_queue = data->default_queue;
1197 }
1198
1199 static bool virtio_net_attach_epbf_rss(VirtIONet *n)
1200 {
1201 struct EBPFRSSConfig config = {};
1202
1203 if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
1204 return false;
1205 }
1206
1207 rss_data_to_rss_config(&n->rss_data, &config);
1208
1209 if (!ebpf_rss_set_all(&n->ebpf_rss, &config,
1210 n->rss_data.indirections_table, n->rss_data.key)) {
1211 return false;
1212 }
1213
1214 if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) {
1215 return false;
1216 }
1217
1218 return true;
1219 }
1220
1221 static void virtio_net_detach_epbf_rss(VirtIONet *n)
1222 {
1223 virtio_net_attach_ebpf_to_backend(n->nic, -1);
1224 }
1225
1226 static bool virtio_net_load_ebpf(VirtIONet *n)
1227 {
1228 if (!virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
1229 /* backend does't support steering ebpf */
1230 return false;
1231 }
1232
1233 return ebpf_rss_load(&n->ebpf_rss);
1234 }
1235
1236 static void virtio_net_unload_ebpf(VirtIONet *n)
1237 {
1238 virtio_net_attach_ebpf_to_backend(n->nic, -1);
1239 ebpf_rss_unload(&n->ebpf_rss);
1240 }
1241
1242 static uint16_t virtio_net_handle_rss(VirtIONet *n,
1243 struct iovec *iov,
1244 unsigned int iov_cnt,
1245 bool do_rss)
1246 {
1247 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1248 struct virtio_net_rss_config cfg;
1249 size_t s, offset = 0, size_get;
1250 uint16_t queues, i;
1251 struct {
1252 uint16_t us;
1253 uint8_t b;
1254 } QEMU_PACKED temp;
1255 const char *err_msg = "";
1256 uint32_t err_value = 0;
1257
1258 if (do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_RSS)) {
1259 err_msg = "RSS is not negotiated";
1260 goto error;
1261 }
1262 if (!do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
1263 err_msg = "Hash report is not negotiated";
1264 goto error;
1265 }
1266 size_get = offsetof(struct virtio_net_rss_config, indirection_table);
1267 s = iov_to_buf(iov, iov_cnt, offset, &cfg, size_get);
1268 if (s != size_get) {
1269 err_msg = "Short command buffer";
1270 err_value = (uint32_t)s;
1271 goto error;
1272 }
1273 n->rss_data.hash_types = virtio_ldl_p(vdev, &cfg.hash_types);
1274 n->rss_data.indirections_len =
1275 virtio_lduw_p(vdev, &cfg.indirection_table_mask);
1276 n->rss_data.indirections_len++;
1277 if (!do_rss) {
1278 n->rss_data.indirections_len = 1;
1279 }
1280 if (!is_power_of_2(n->rss_data.indirections_len)) {
1281 err_msg = "Invalid size of indirection table";
1282 err_value = n->rss_data.indirections_len;
1283 goto error;
1284 }
1285 if (n->rss_data.indirections_len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
1286 err_msg = "Too large indirection table";
1287 err_value = n->rss_data.indirections_len;
1288 goto error;
1289 }
1290 n->rss_data.default_queue = do_rss ?
1291 virtio_lduw_p(vdev, &cfg.unclassified_queue) : 0;
1292 if (n->rss_data.default_queue >= n->max_queues) {
1293 err_msg = "Invalid default queue";
1294 err_value = n->rss_data.default_queue;
1295 goto error;
1296 }
1297 offset += size_get;
1298 size_get = sizeof(uint16_t) * n->rss_data.indirections_len;
1299 g_free(n->rss_data.indirections_table);
1300 n->rss_data.indirections_table = g_malloc(size_get);
1301 if (!n->rss_data.indirections_table) {
1302 err_msg = "Can't allocate indirections table";
1303 err_value = n->rss_data.indirections_len;
1304 goto error;
1305 }
1306 s = iov_to_buf(iov, iov_cnt, offset,
1307 n->rss_data.indirections_table, size_get);
1308 if (s != size_get) {
1309 err_msg = "Short indirection table buffer";
1310 err_value = (uint32_t)s;
1311 goto error;
1312 }
1313 for (i = 0; i < n->rss_data.indirections_len; ++i) {
1314 uint16_t val = n->rss_data.indirections_table[i];
1315 n->rss_data.indirections_table[i] = virtio_lduw_p(vdev, &val);
1316 }
1317 offset += size_get;
1318 size_get = sizeof(temp);
1319 s = iov_to_buf(iov, iov_cnt, offset, &temp, size_get);
1320 if (s != size_get) {
1321 err_msg = "Can't get queues";
1322 err_value = (uint32_t)s;
1323 goto error;
1324 }
1325 queues = do_rss ? virtio_lduw_p(vdev, &temp.us) : n->curr_queues;
1326 if (queues == 0 || queues > n->max_queues) {
1327 err_msg = "Invalid number of queues";
1328 err_value = queues;
1329 goto error;
1330 }
1331 if (temp.b > VIRTIO_NET_RSS_MAX_KEY_SIZE) {
1332 err_msg = "Invalid key size";
1333 err_value = temp.b;
1334 goto error;
1335 }
1336 if (!temp.b && n->rss_data.hash_types) {
1337 err_msg = "No key provided";
1338 err_value = 0;
1339 goto error;
1340 }
1341 if (!temp.b && !n->rss_data.hash_types) {
1342 virtio_net_disable_rss(n);
1343 return queues;
1344 }
1345 offset += size_get;
1346 size_get = temp.b;
1347 s = iov_to_buf(iov, iov_cnt, offset, n->rss_data.key, size_get);
1348 if (s != size_get) {
1349 err_msg = "Can get key buffer";
1350 err_value = (uint32_t)s;
1351 goto error;
1352 }
1353 n->rss_data.enabled = true;
1354
1355 if (!n->rss_data.populate_hash) {
1356 if (!virtio_net_attach_epbf_rss(n)) {
1357 /* EBPF must be loaded for vhost */
1358 if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
1359 warn_report("Can't load eBPF RSS for vhost");
1360 goto error;
1361 }
1362 /* fallback to software RSS */
1363 warn_report("Can't load eBPF RSS - fallback to software RSS");
1364 n->rss_data.enabled_software_rss = true;
1365 }
1366 } else {
1367 /* use software RSS for hash populating */
1368 /* and detach eBPF if was loaded before */
1369 virtio_net_detach_epbf_rss(n);
1370 n->rss_data.enabled_software_rss = true;
1371 }
1372
1373 trace_virtio_net_rss_enable(n->rss_data.hash_types,
1374 n->rss_data.indirections_len,
1375 temp.b);
1376 return queues;
1377 error:
1378 trace_virtio_net_rss_error(err_msg, err_value);
1379 virtio_net_disable_rss(n);
1380 return 0;
1381 }
1382
1383 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
1384 struct iovec *iov, unsigned int iov_cnt)
1385 {
1386 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1387 uint16_t queues;
1388
1389 virtio_net_disable_rss(n);
1390 if (cmd == VIRTIO_NET_CTRL_MQ_HASH_CONFIG) {
1391 queues = virtio_net_handle_rss(n, iov, iov_cnt, false);
1392 return queues ? VIRTIO_NET_OK : VIRTIO_NET_ERR;
1393 }
1394 if (cmd == VIRTIO_NET_CTRL_MQ_RSS_CONFIG) {
1395 queues = virtio_net_handle_rss(n, iov, iov_cnt, true);
1396 } else if (cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
1397 struct virtio_net_ctrl_mq mq;
1398 size_t s;
1399 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ)) {
1400 return VIRTIO_NET_ERR;
1401 }
1402 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
1403 if (s != sizeof(mq)) {
1404 return VIRTIO_NET_ERR;
1405 }
1406 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
1407
1408 } else {
1409 return VIRTIO_NET_ERR;
1410 }
1411
1412 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1413 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1414 queues > n->max_queues ||
1415 !n->multiqueue) {
1416 return VIRTIO_NET_ERR;
1417 }
1418
1419 n->curr_queues = queues;
1420 /* stop the backend before changing the number of queues to avoid handling a
1421 * disabled queue */
1422 virtio_net_set_status(vdev, vdev->status);
1423 virtio_net_set_queues(n);
1424
1425 return VIRTIO_NET_OK;
1426 }
1427
1428 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
1429 {
1430 VirtIONet *n = VIRTIO_NET(vdev);
1431 struct virtio_net_ctrl_hdr ctrl;
1432 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
1433 VirtQueueElement *elem;
1434 size_t s;
1435 struct iovec *iov, *iov2;
1436 unsigned int iov_cnt;
1437
1438 for (;;) {
1439 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
1440 if (!elem) {
1441 break;
1442 }
1443 if (iov_size(elem->in_sg, elem->in_num) < sizeof(status) ||
1444 iov_size(elem->out_sg, elem->out_num) < sizeof(ctrl)) {
1445 virtio_error(vdev, "virtio-net ctrl missing headers");
1446 virtqueue_detach_element(vq, elem, 0);
1447 g_free(elem);
1448 break;
1449 }
1450
1451 iov_cnt = elem->out_num;
1452 iov2 = iov = g_memdup(elem->out_sg, sizeof(struct iovec) * elem->out_num);
1453 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
1454 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
1455 if (s != sizeof(ctrl)) {
1456 status = VIRTIO_NET_ERR;
1457 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
1458 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
1459 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
1460 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
1461 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
1462 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
1463 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
1464 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
1465 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
1466 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
1467 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
1468 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
1469 }
1470
1471 s = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, sizeof(status));
1472 assert(s == sizeof(status));
1473
1474 virtqueue_push(vq, elem, sizeof(status));
1475 virtio_notify(vdev, vq);
1476 g_free(iov2);
1477 g_free(elem);
1478 }
1479 }
1480
1481 /* RX */
1482
1483 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
1484 {
1485 VirtIONet *n = VIRTIO_NET(vdev);
1486 int queue_index = vq2q(virtio_get_queue_index(vq));
1487
1488 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
1489 }
1490
1491 static bool virtio_net_can_receive(NetClientState *nc)
1492 {
1493 VirtIONet *n = qemu_get_nic_opaque(nc);
1494 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1495 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1496
1497 if (!vdev->vm_running) {
1498 return false;
1499 }
1500
1501 if (nc->queue_index >= n->curr_queues) {
1502 return false;
1503 }
1504
1505 if (!virtio_queue_ready(q->rx_vq) ||
1506 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1507 return false;
1508 }
1509
1510 return true;
1511 }
1512
1513 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
1514 {
1515 VirtIONet *n = q->n;
1516 if (virtio_queue_empty(q->rx_vq) ||
1517 (n->mergeable_rx_bufs &&
1518 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1519 virtio_queue_set_notification(q->rx_vq, 1);
1520
1521 /* To avoid a race condition where the guest has made some buffers
1522 * available after the above check but before notification was
1523 * enabled, check for available buffers again.
1524 */
1525 if (virtio_queue_empty(q->rx_vq) ||
1526 (n->mergeable_rx_bufs &&
1527 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1528 return 0;
1529 }
1530 }
1531
1532 virtio_queue_set_notification(q->rx_vq, 0);
1533 return 1;
1534 }
1535
1536 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
1537 {
1538 virtio_tswap16s(vdev, &hdr->hdr_len);
1539 virtio_tswap16s(vdev, &hdr->gso_size);
1540 virtio_tswap16s(vdev, &hdr->csum_start);
1541 virtio_tswap16s(vdev, &hdr->csum_offset);
1542 }
1543
1544 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
1545 * it never finds out that the packets don't have valid checksums. This
1546 * causes dhclient to get upset. Fedora's carried a patch for ages to
1547 * fix this with Xen but it hasn't appeared in an upstream release of
1548 * dhclient yet.
1549 *
1550 * To avoid breaking existing guests, we catch udp packets and add
1551 * checksums. This is terrible but it's better than hacking the guest
1552 * kernels.
1553 *
1554 * N.B. if we introduce a zero-copy API, this operation is no longer free so
1555 * we should provide a mechanism to disable it to avoid polluting the host
1556 * cache.
1557 */
1558 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
1559 uint8_t *buf, size_t size)
1560 {
1561 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
1562 (size > 27 && size < 1500) && /* normal sized MTU */
1563 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
1564 (buf[23] == 17) && /* ip.protocol == UDP */
1565 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
1566 net_checksum_calculate(buf, size, CSUM_UDP);
1567 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
1568 }
1569 }
1570
1571 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
1572 const void *buf, size_t size)
1573 {
1574 if (n->has_vnet_hdr) {
1575 /* FIXME this cast is evil */
1576 void *wbuf = (void *)buf;
1577 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
1578 size - n->host_hdr_len);
1579
1580 if (n->needs_vnet_hdr_swap) {
1581 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
1582 }
1583 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
1584 } else {
1585 struct virtio_net_hdr hdr = {
1586 .flags = 0,
1587 .gso_type = VIRTIO_NET_HDR_GSO_NONE
1588 };
1589 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
1590 }
1591 }
1592
1593 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
1594 {
1595 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1596 static const uint8_t vlan[] = {0x81, 0x00};
1597 uint8_t *ptr = (uint8_t *)buf;
1598 int i;
1599
1600 if (n->promisc)
1601 return 1;
1602
1603 ptr += n->host_hdr_len;
1604
1605 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
1606 int vid = lduw_be_p(ptr + 14) & 0xfff;
1607 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
1608 return 0;
1609 }
1610
1611 if (ptr[0] & 1) { // multicast
1612 if (!memcmp(ptr, bcast, sizeof(bcast))) {
1613 return !n->nobcast;
1614 } else if (n->nomulti) {
1615 return 0;
1616 } else if (n->allmulti || n->mac_table.multi_overflow) {
1617 return 1;
1618 }
1619
1620 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
1621 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1622 return 1;
1623 }
1624 }
1625 } else { // unicast
1626 if (n->nouni) {
1627 return 0;
1628 } else if (n->alluni || n->mac_table.uni_overflow) {
1629 return 1;
1630 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
1631 return 1;
1632 }
1633
1634 for (i = 0; i < n->mac_table.first_multi; i++) {
1635 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1636 return 1;
1637 }
1638 }
1639 }
1640
1641 return 0;
1642 }
1643
1644 static uint8_t virtio_net_get_hash_type(bool isip4,
1645 bool isip6,
1646 bool isudp,
1647 bool istcp,
1648 uint32_t types)
1649 {
1650 if (isip4) {
1651 if (istcp && (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4)) {
1652 return NetPktRssIpV4Tcp;
1653 }
1654 if (isudp && (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4)) {
1655 return NetPktRssIpV4Udp;
1656 }
1657 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
1658 return NetPktRssIpV4;
1659 }
1660 } else if (isip6) {
1661 uint32_t mask = VIRTIO_NET_RSS_HASH_TYPE_TCP_EX |
1662 VIRTIO_NET_RSS_HASH_TYPE_TCPv6;
1663
1664 if (istcp && (types & mask)) {
1665 return (types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) ?
1666 NetPktRssIpV6TcpEx : NetPktRssIpV6Tcp;
1667 }
1668 mask = VIRTIO_NET_RSS_HASH_TYPE_UDP_EX | VIRTIO_NET_RSS_HASH_TYPE_UDPv6;
1669 if (isudp && (types & mask)) {
1670 return (types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) ?
1671 NetPktRssIpV6UdpEx : NetPktRssIpV6Udp;
1672 }
1673 mask = VIRTIO_NET_RSS_HASH_TYPE_IP_EX | VIRTIO_NET_RSS_HASH_TYPE_IPv6;
1674 if (types & mask) {
1675 return (types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) ?
1676 NetPktRssIpV6Ex : NetPktRssIpV6;
1677 }
1678 }
1679 return 0xff;
1680 }
1681
1682 static void virtio_set_packet_hash(const uint8_t *buf, uint8_t report,
1683 uint32_t hash)
1684 {
1685 struct virtio_net_hdr_v1_hash *hdr = (void *)buf;
1686 hdr->hash_value = hash;
1687 hdr->hash_report = report;
1688 }
1689
1690 static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf,
1691 size_t size)
1692 {
1693 VirtIONet *n = qemu_get_nic_opaque(nc);
1694 unsigned int index = nc->queue_index, new_index = index;
1695 struct NetRxPkt *pkt = n->rx_pkt;
1696 uint8_t net_hash_type;
1697 uint32_t hash;
1698 bool isip4, isip6, isudp, istcp;
1699 static const uint8_t reports[NetPktRssIpV6UdpEx + 1] = {
1700 VIRTIO_NET_HASH_REPORT_IPv4,
1701 VIRTIO_NET_HASH_REPORT_TCPv4,
1702 VIRTIO_NET_HASH_REPORT_TCPv6,
1703 VIRTIO_NET_HASH_REPORT_IPv6,
1704 VIRTIO_NET_HASH_REPORT_IPv6_EX,
1705 VIRTIO_NET_HASH_REPORT_TCPv6_EX,
1706 VIRTIO_NET_HASH_REPORT_UDPv4,
1707 VIRTIO_NET_HASH_REPORT_UDPv6,
1708 VIRTIO_NET_HASH_REPORT_UDPv6_EX
1709 };
1710
1711 net_rx_pkt_set_protocols(pkt, buf + n->host_hdr_len,
1712 size - n->host_hdr_len);
1713 net_rx_pkt_get_protocols(pkt, &isip4, &isip6, &isudp, &istcp);
1714 if (isip4 && (net_rx_pkt_get_ip4_info(pkt)->fragment)) {
1715 istcp = isudp = false;
1716 }
1717 if (isip6 && (net_rx_pkt_get_ip6_info(pkt)->fragment)) {
1718 istcp = isudp = false;
1719 }
1720 net_hash_type = virtio_net_get_hash_type(isip4, isip6, isudp, istcp,
1721 n->rss_data.hash_types);
1722 if (net_hash_type > NetPktRssIpV6UdpEx) {
1723 if (n->rss_data.populate_hash) {
1724 virtio_set_packet_hash(buf, VIRTIO_NET_HASH_REPORT_NONE, 0);
1725 }
1726 return n->rss_data.redirect ? n->rss_data.default_queue : -1;
1727 }
1728
1729 hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key);
1730
1731 if (n->rss_data.populate_hash) {
1732 virtio_set_packet_hash(buf, reports[net_hash_type], hash);
1733 }
1734
1735 if (n->rss_data.redirect) {
1736 new_index = hash & (n->rss_data.indirections_len - 1);
1737 new_index = n->rss_data.indirections_table[new_index];
1738 }
1739
1740 return (index == new_index) ? -1 : new_index;
1741 }
1742
1743 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
1744 size_t size, bool no_rss)
1745 {
1746 VirtIONet *n = qemu_get_nic_opaque(nc);
1747 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1748 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1749 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1750 struct virtio_net_hdr_mrg_rxbuf mhdr;
1751 unsigned mhdr_cnt = 0;
1752 size_t offset, i, guest_offset;
1753
1754 if (!virtio_net_can_receive(nc)) {
1755 return -1;
1756 }
1757
1758 if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
1759 int index = virtio_net_process_rss(nc, buf, size);
1760 if (index >= 0) {
1761 NetClientState *nc2 = qemu_get_subqueue(n->nic, index);
1762 return virtio_net_receive_rcu(nc2, buf, size, true);
1763 }
1764 }
1765
1766 /* hdr_len refers to the header we supply to the guest */
1767 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1768 return 0;
1769 }
1770
1771 if (!receive_filter(n, buf, size))
1772 return size;
1773
1774 offset = i = 0;
1775
1776 while (offset < size) {
1777 VirtQueueElement *elem;
1778 int len, total;
1779 const struct iovec *sg;
1780
1781 total = 0;
1782
1783 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
1784 if (!elem) {
1785 if (i) {
1786 virtio_error(vdev, "virtio-net unexpected empty queue: "
1787 "i %zd mergeable %d offset %zd, size %zd, "
1788 "guest hdr len %zd, host hdr len %zd "
1789 "guest features 0x%" PRIx64,
1790 i, n->mergeable_rx_bufs, offset, size,
1791 n->guest_hdr_len, n->host_hdr_len,
1792 vdev->guest_features);
1793 }
1794 return -1;
1795 }
1796
1797 if (elem->in_num < 1) {
1798 virtio_error(vdev,
1799 "virtio-net receive queue contains no in buffers");
1800 virtqueue_detach_element(q->rx_vq, elem, 0);
1801 g_free(elem);
1802 return -1;
1803 }
1804
1805 sg = elem->in_sg;
1806 if (i == 0) {
1807 assert(offset == 0);
1808 if (n->mergeable_rx_bufs) {
1809 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1810 sg, elem->in_num,
1811 offsetof(typeof(mhdr), num_buffers),
1812 sizeof(mhdr.num_buffers));
1813 }
1814
1815 receive_header(n, sg, elem->in_num, buf, size);
1816 if (n->rss_data.populate_hash) {
1817 offset = sizeof(mhdr);
1818 iov_from_buf(sg, elem->in_num, offset,
1819 buf + offset, n->host_hdr_len - sizeof(mhdr));
1820 }
1821 offset = n->host_hdr_len;
1822 total += n->guest_hdr_len;
1823 guest_offset = n->guest_hdr_len;
1824 } else {
1825 guest_offset = 0;
1826 }
1827
1828 /* copy in packet. ugh */
1829 len = iov_from_buf(sg, elem->in_num, guest_offset,
1830 buf + offset, size - offset);
1831 total += len;
1832 offset += len;
1833 /* If buffers can't be merged, at this point we
1834 * must have consumed the complete packet.
1835 * Otherwise, drop it. */
1836 if (!n->mergeable_rx_bufs && offset < size) {
1837 virtqueue_unpop(q->rx_vq, elem, total);
1838 g_free(elem);
1839 return size;
1840 }
1841
1842 /* signal other side */
1843 virtqueue_fill(q->rx_vq, elem, total, i++);
1844 g_free(elem);
1845 }
1846
1847 if (mhdr_cnt) {
1848 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1849 iov_from_buf(mhdr_sg, mhdr_cnt,
1850 0,
1851 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1852 }
1853
1854 virtqueue_flush(q->rx_vq, i);
1855 virtio_notify(vdev, q->rx_vq);
1856
1857 return size;
1858 }
1859
1860 static ssize_t virtio_net_do_receive(NetClientState *nc, const uint8_t *buf,
1861 size_t size)
1862 {
1863 RCU_READ_LOCK_GUARD();
1864
1865 return virtio_net_receive_rcu(nc, buf, size, false);
1866 }
1867
1868 static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain,
1869 const uint8_t *buf,
1870 VirtioNetRscUnit *unit)
1871 {
1872 uint16_t ip_hdrlen;
1873 struct ip_header *ip;
1874
1875 ip = (struct ip_header *)(buf + chain->n->guest_hdr_len
1876 + sizeof(struct eth_header));
1877 unit->ip = (void *)ip;
1878 ip_hdrlen = (ip->ip_ver_len & 0xF) << 2;
1879 unit->ip_plen = &ip->ip_len;
1880 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) + ip_hdrlen);
1881 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10;
1882 unit->payload = htons(*unit->ip_plen) - ip_hdrlen - unit->tcp_hdrlen;
1883 }
1884
1885 static void virtio_net_rsc_extract_unit6(VirtioNetRscChain *chain,
1886 const uint8_t *buf,
1887 VirtioNetRscUnit *unit)
1888 {
1889 struct ip6_header *ip6;
1890
1891 ip6 = (struct ip6_header *)(buf + chain->n->guest_hdr_len
1892 + sizeof(struct eth_header));
1893 unit->ip = ip6;
1894 unit->ip_plen = &(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
1895 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip)
1896 + sizeof(struct ip6_header));
1897 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10;
1898
1899 /* There is a difference between payload lenght in ipv4 and v6,
1900 ip header is excluded in ipv6 */
1901 unit->payload = htons(*unit->ip_plen) - unit->tcp_hdrlen;
1902 }
1903
1904 static size_t virtio_net_rsc_drain_seg(VirtioNetRscChain *chain,
1905 VirtioNetRscSeg *seg)
1906 {
1907 int ret;
1908 struct virtio_net_hdr_v1 *h;
1909
1910 h = (struct virtio_net_hdr_v1 *)seg->buf;
1911 h->flags = 0;
1912 h->gso_type = VIRTIO_NET_HDR_GSO_NONE;
1913
1914 if (seg->is_coalesced) {
1915 h->rsc.segments = seg->packets;
1916 h->rsc.dup_acks = seg->dup_ack;
1917 h->flags = VIRTIO_NET_HDR_F_RSC_INFO;
1918 if (chain->proto == ETH_P_IP) {
1919 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
1920 } else {
1921 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
1922 }
1923 }
1924
1925 ret = virtio_net_do_receive(seg->nc, seg->buf, seg->size);
1926 QTAILQ_REMOVE(&chain->buffers, seg, next);
1927 g_free(seg->buf);
1928 g_free(seg);
1929
1930 return ret;
1931 }
1932
1933 static void virtio_net_rsc_purge(void *opq)
1934 {
1935 VirtioNetRscSeg *seg, *rn;
1936 VirtioNetRscChain *chain = (VirtioNetRscChain *)opq;
1937
1938 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn) {
1939 if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
1940 chain->stat.purge_failed++;
1941 continue;
1942 }
1943 }
1944
1945 chain->stat.timer++;
1946 if (!QTAILQ_EMPTY(&chain->buffers)) {
1947 timer_mod(chain->drain_timer,
1948 qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout);
1949 }
1950 }
1951
1952 static void virtio_net_rsc_cleanup(VirtIONet *n)
1953 {
1954 VirtioNetRscChain *chain, *rn_chain;
1955 VirtioNetRscSeg *seg, *rn_seg;
1956
1957 QTAILQ_FOREACH_SAFE(chain, &n->rsc_chains, next, rn_chain) {
1958 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn_seg) {
1959 QTAILQ_REMOVE(&chain->buffers, seg, next);
1960 g_free(seg->buf);
1961 g_free(seg);
1962 }
1963
1964 timer_free(chain->drain_timer);
1965 QTAILQ_REMOVE(&n->rsc_chains, chain, next);
1966 g_free(chain);
1967 }
1968 }
1969
1970 static void virtio_net_rsc_cache_buf(VirtioNetRscChain *chain,
1971 NetClientState *nc,
1972 const uint8_t *buf, size_t size)
1973 {
1974 uint16_t hdr_len;
1975 VirtioNetRscSeg *seg;
1976
1977 hdr_len = chain->n->guest_hdr_len;
1978 seg = g_malloc(sizeof(VirtioNetRscSeg));
1979 seg->buf = g_malloc(hdr_len + sizeof(struct eth_header)
1980 + sizeof(struct ip6_header) + VIRTIO_NET_MAX_TCP_PAYLOAD);
1981 memcpy(seg->buf, buf, size);
1982 seg->size = size;
1983 seg->packets = 1;
1984 seg->dup_ack = 0;
1985 seg->is_coalesced = 0;
1986 seg->nc = nc;
1987
1988 QTAILQ_INSERT_TAIL(&chain->buffers, seg, next);
1989 chain->stat.cache++;
1990
1991 switch (chain->proto) {
1992 case ETH_P_IP:
1993 virtio_net_rsc_extract_unit4(chain, seg->buf, &seg->unit);
1994 break;
1995 case ETH_P_IPV6:
1996 virtio_net_rsc_extract_unit6(chain, seg->buf, &seg->unit);
1997 break;
1998 default:
1999 g_assert_not_reached();
2000 }
2001 }
2002
2003 static int32_t virtio_net_rsc_handle_ack(VirtioNetRscChain *chain,
2004 VirtioNetRscSeg *seg,
2005 const uint8_t *buf,
2006 struct tcp_header *n_tcp,
2007 struct tcp_header *o_tcp)
2008 {
2009 uint32_t nack, oack;
2010 uint16_t nwin, owin;
2011
2012 nack = htonl(n_tcp->th_ack);
2013 nwin = htons(n_tcp->th_win);
2014 oack = htonl(o_tcp->th_ack);
2015 owin = htons(o_tcp->th_win);
2016
2017 if ((nack - oack) >= VIRTIO_NET_MAX_TCP_PAYLOAD) {
2018 chain->stat.ack_out_of_win++;
2019 return RSC_FINAL;
2020 } else if (nack == oack) {
2021 /* duplicated ack or window probe */
2022 if (nwin == owin) {
2023 /* duplicated ack, add dup ack count due to whql test up to 1 */
2024 chain->stat.dup_ack++;
2025 return RSC_FINAL;
2026 } else {
2027 /* Coalesce window update */
2028 o_tcp->th_win = n_tcp->th_win;
2029 chain->stat.win_update++;
2030 return RSC_COALESCE;
2031 }
2032 } else {
2033 /* pure ack, go to 'C', finalize*/
2034 chain->stat.pure_ack++;
2035 return RSC_FINAL;
2036 }
2037 }
2038
2039 static int32_t virtio_net_rsc_coalesce_data(VirtioNetRscChain *chain,
2040 VirtioNetRscSeg *seg,
2041 const uint8_t *buf,
2042 VirtioNetRscUnit *n_unit)
2043 {
2044 void *data;
2045 uint16_t o_ip_len;
2046 uint32_t nseq, oseq;
2047 VirtioNetRscUnit *o_unit;
2048
2049 o_unit = &seg->unit;
2050 o_ip_len = htons(*o_unit->ip_plen);
2051 nseq = htonl(n_unit->tcp->th_seq);
2052 oseq = htonl(o_unit->tcp->th_seq);
2053
2054 /* out of order or retransmitted. */
2055 if ((nseq - oseq) > VIRTIO_NET_MAX_TCP_PAYLOAD) {
2056 chain->stat.data_out_of_win++;
2057 return RSC_FINAL;
2058 }
2059
2060 data = ((uint8_t *)n_unit->tcp) + n_unit->tcp_hdrlen;
2061 if (nseq == oseq) {
2062 if ((o_unit->payload == 0) && n_unit->payload) {
2063 /* From no payload to payload, normal case, not a dup ack or etc */
2064 chain->stat.data_after_pure_ack++;
2065 goto coalesce;
2066 } else {
2067 return virtio_net_rsc_handle_ack(chain, seg, buf,
2068 n_unit->tcp, o_unit->tcp);
2069 }
2070 } else if ((nseq - oseq) != o_unit->payload) {
2071 /* Not a consistent packet, out of order */
2072 chain->stat.data_out_of_order++;
2073 return RSC_FINAL;
2074 } else {
2075 coalesce:
2076 if ((o_ip_len + n_unit->payload) > chain->max_payload) {
2077 chain->stat.over_size++;
2078 return RSC_FINAL;
2079 }
2080
2081 /* Here comes the right data, the payload length in v4/v6 is different,
2082 so use the field value to update and record the new data len */
2083 o_unit->payload += n_unit->payload; /* update new data len */
2084
2085 /* update field in ip header */
2086 *o_unit->ip_plen = htons(o_ip_len + n_unit->payload);
2087
2088 /* Bring 'PUSH' big, the whql test guide says 'PUSH' can be coalesced
2089 for windows guest, while this may change the behavior for linux
2090 guest (only if it uses RSC feature). */
2091 o_unit->tcp->th_offset_flags = n_unit->tcp->th_offset_flags;
2092
2093 o_unit->tcp->th_ack = n_unit->tcp->th_ack;
2094 o_unit->tcp->th_win = n_unit->tcp->th_win;
2095
2096 memmove(seg->buf + seg->size, data, n_unit->payload);
2097 seg->size += n_unit->payload;
2098 seg->packets++;
2099 chain->stat.coalesced++;
2100 return RSC_COALESCE;
2101 }
2102 }
2103
2104 static int32_t virtio_net_rsc_coalesce4(VirtioNetRscChain *chain,
2105 VirtioNetRscSeg *seg,
2106 const uint8_t *buf, size_t size,
2107 VirtioNetRscUnit *unit)
2108 {
2109 struct ip_header *ip1, *ip2;
2110
2111 ip1 = (struct ip_header *)(unit->ip);
2112 ip2 = (struct ip_header *)(seg->unit.ip);
2113 if ((ip1->ip_src ^ ip2->ip_src) || (ip1->ip_dst ^ ip2->ip_dst)
2114 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport)
2115 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) {
2116 chain->stat.no_match++;
2117 return RSC_NO_MATCH;
2118 }
2119
2120 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit);
2121 }
2122
2123 static int32_t virtio_net_rsc_coalesce6(VirtioNetRscChain *chain,
2124 VirtioNetRscSeg *seg,
2125 const uint8_t *buf, size_t size,
2126 VirtioNetRscUnit *unit)
2127 {
2128 struct ip6_header *ip1, *ip2;
2129
2130 ip1 = (struct ip6_header *)(unit->ip);
2131 ip2 = (struct ip6_header *)(seg->unit.ip);
2132 if (memcmp(&ip1->ip6_src, &ip2->ip6_src, sizeof(struct in6_address))
2133 || memcmp(&ip1->ip6_dst, &ip2->ip6_dst, sizeof(struct in6_address))
2134 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport)
2135 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) {
2136 chain->stat.no_match++;
2137 return RSC_NO_MATCH;
2138 }
2139
2140 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit);
2141 }
2142
2143 /* Packets with 'SYN' should bypass, other flag should be sent after drain
2144 * to prevent out of order */
2145 static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain,
2146 struct tcp_header *tcp)
2147 {
2148 uint16_t tcp_hdr;
2149 uint16_t tcp_flag;
2150
2151 tcp_flag = htons(tcp->th_offset_flags);
2152 tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10;
2153 tcp_flag &= VIRTIO_NET_TCP_FLAG;
2154 if (tcp_flag & TH_SYN) {
2155 chain->stat.tcp_syn++;
2156 return RSC_BYPASS;
2157 }
2158
2159 if (tcp_flag & (TH_FIN | TH_URG | TH_RST | TH_ECE | TH_CWR)) {
2160 chain->stat.tcp_ctrl_drain++;
2161 return RSC_FINAL;
2162 }
2163
2164 if (tcp_hdr > sizeof(struct tcp_header)) {
2165 chain->stat.tcp_all_opt++;
2166 return RSC_FINAL;
2167 }
2168
2169 return RSC_CANDIDATE;
2170 }
2171
2172 static size_t virtio_net_rsc_do_coalesce(VirtioNetRscChain *chain,
2173 NetClientState *nc,
2174 const uint8_t *buf, size_t size,
2175 VirtioNetRscUnit *unit)
2176 {
2177 int ret;
2178 VirtioNetRscSeg *seg, *nseg;
2179
2180 if (QTAILQ_EMPTY(&chain->buffers)) {
2181 chain->stat.empty_cache++;
2182 virtio_net_rsc_cache_buf(chain, nc, buf, size);
2183 timer_mod(chain->drain_timer,
2184 qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout);
2185 return size;
2186 }
2187
2188 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) {
2189 if (chain->proto == ETH_P_IP) {
2190 ret = virtio_net_rsc_coalesce4(chain, seg, buf, size, unit);
2191 } else {
2192 ret = virtio_net_rsc_coalesce6(chain, seg, buf, size, unit);
2193 }
2194
2195 if (ret == RSC_FINAL) {
2196 if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
2197 /* Send failed */
2198 chain->stat.final_failed++;
2199 return 0;
2200 }
2201
2202 /* Send current packet */
2203 return virtio_net_do_receive(nc, buf, size);
2204 } else if (ret == RSC_NO_MATCH) {
2205 continue;
2206 } else {
2207 /* Coalesced, mark coalesced flag to tell calc cksum for ipv4 */
2208 seg->is_coalesced = 1;
2209 return size;
2210 }
2211 }
2212
2213 chain->stat.no_match_cache++;
2214 virtio_net_rsc_cache_buf(chain, nc, buf, size);
2215 return size;
2216 }
2217
2218 /* Drain a connection data, this is to avoid out of order segments */
2219 static size_t virtio_net_rsc_drain_flow(VirtioNetRscChain *chain,
2220 NetClientState *nc,
2221 const uint8_t *buf, size_t size,
2222 uint16_t ip_start, uint16_t ip_size,
2223 uint16_t tcp_port)
2224 {
2225 VirtioNetRscSeg *seg, *nseg;
2226 uint32_t ppair1, ppair2;
2227
2228 ppair1 = *(uint32_t *)(buf + tcp_port);
2229 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) {
2230 ppair2 = *(uint32_t *)(seg->buf + tcp_port);
2231 if (memcmp(buf + ip_start, seg->buf + ip_start, ip_size)
2232 || (ppair1 != ppair2)) {
2233 continue;
2234 }
2235 if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
2236 chain->stat.drain_failed++;
2237 }
2238
2239 break;
2240 }
2241
2242 return virtio_net_do_receive(nc, buf, size);
2243 }
2244
2245 static int32_t virtio_net_rsc_sanity_check4(VirtioNetRscChain *chain,
2246 struct ip_header *ip,
2247 const uint8_t *buf, size_t size)
2248 {
2249 uint16_t ip_len;
2250
2251 /* Not an ipv4 packet */
2252 if (((ip->ip_ver_len & 0xF0) >> 4) != IP_HEADER_VERSION_4) {
2253 chain->stat.ip_option++;
2254 return RSC_BYPASS;
2255 }
2256
2257 /* Don't handle packets with ip option */
2258 if ((ip->ip_ver_len & 0xF) != VIRTIO_NET_IP4_HEADER_LENGTH) {
2259 chain->stat.ip_option++;
2260 return RSC_BYPASS;
2261 }
2262
2263 if (ip->ip_p != IPPROTO_TCP) {
2264 chain->stat.bypass_not_tcp++;
2265 return RSC_BYPASS;
2266 }
2267
2268 /* Don't handle packets with ip fragment */
2269 if (!(htons(ip->ip_off) & IP_DF)) {
2270 chain->stat.ip_frag++;
2271 return RSC_BYPASS;
2272 }
2273
2274 /* Don't handle packets with ecn flag */
2275 if (IPTOS_ECN(ip->ip_tos)) {
2276 chain->stat.ip_ecn++;
2277 return RSC_BYPASS;
2278 }
2279
2280 ip_len = htons(ip->ip_len);
2281 if (ip_len < (sizeof(struct ip_header) + sizeof(struct tcp_header))
2282 || ip_len > (size - chain->n->guest_hdr_len -
2283 sizeof(struct eth_header))) {
2284 chain->stat.ip_hacked++;
2285 return RSC_BYPASS;
2286 }
2287
2288 return RSC_CANDIDATE;
2289 }
2290
2291 static size_t virtio_net_rsc_receive4(VirtioNetRscChain *chain,
2292 NetClientState *nc,
2293 const uint8_t *buf, size_t size)
2294 {
2295 int32_t ret;
2296 uint16_t hdr_len;
2297 VirtioNetRscUnit unit;
2298
2299 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len;
2300
2301 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header)
2302 + sizeof(struct tcp_header))) {
2303 chain->stat.bypass_not_tcp++;
2304 return virtio_net_do_receive(nc, buf, size);
2305 }
2306
2307 virtio_net_rsc_extract_unit4(chain, buf, &unit);
2308 if (virtio_net_rsc_sanity_check4(chain, unit.ip, buf, size)
2309 != RSC_CANDIDATE) {
2310 return virtio_net_do_receive(nc, buf, size);
2311 }
2312
2313 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp);
2314 if (ret == RSC_BYPASS) {
2315 return virtio_net_do_receive(nc, buf, size);
2316 } else if (ret == RSC_FINAL) {
2317 return virtio_net_rsc_drain_flow(chain, nc, buf, size,
2318 ((hdr_len + sizeof(struct eth_header)) + 12),
2319 VIRTIO_NET_IP4_ADDR_SIZE,
2320 hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header));
2321 }
2322
2323 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit);
2324 }
2325
2326 static int32_t virtio_net_rsc_sanity_check6(VirtioNetRscChain *chain,
2327 struct ip6_header *ip6,
2328 const uint8_t *buf, size_t size)
2329 {
2330 uint16_t ip_len;
2331
2332 if (((ip6->ip6_ctlun.ip6_un1.ip6_un1_flow & 0xF0) >> 4)
2333 != IP_HEADER_VERSION_6) {
2334 return RSC_BYPASS;
2335 }
2336
2337 /* Both option and protocol is checked in this */
2338 if (ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) {
2339 chain->stat.bypass_not_tcp++;
2340 return RSC_BYPASS;
2341 }
2342
2343 ip_len = htons(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
2344 if (ip_len < sizeof(struct tcp_header) ||
2345 ip_len > (size - chain->n->guest_hdr_len - sizeof(struct eth_header)
2346 - sizeof(struct ip6_header))) {
2347 chain->stat.ip_hacked++;
2348 return RSC_BYPASS;
2349 }
2350
2351 /* Don't handle packets with ecn flag */
2352 if (IP6_ECN(ip6->ip6_ctlun.ip6_un3.ip6_un3_ecn)) {
2353 chain->stat.ip_ecn++;
2354 return RSC_BYPASS;
2355 }
2356
2357 return RSC_CANDIDATE;
2358 }
2359
2360 static size_t virtio_net_rsc_receive6(void *opq, NetClientState *nc,
2361 const uint8_t *buf, size_t size)
2362 {
2363 int32_t ret;
2364 uint16_t hdr_len;
2365 VirtioNetRscChain *chain;
2366 VirtioNetRscUnit unit;
2367
2368 chain = (VirtioNetRscChain *)opq;
2369 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len;
2370
2371 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip6_header)
2372 + sizeof(tcp_header))) {
2373 return virtio_net_do_receive(nc, buf, size);
2374 }
2375
2376 virtio_net_rsc_extract_unit6(chain, buf, &unit);
2377 if (RSC_CANDIDATE != virtio_net_rsc_sanity_check6(chain,
2378 unit.ip, buf, size)) {
2379 return virtio_net_do_receive(nc, buf, size);
2380 }
2381
2382 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp);
2383 if (ret == RSC_BYPASS) {
2384 return virtio_net_do_receive(nc, buf, size);
2385 } else if (ret == RSC_FINAL) {
2386 return virtio_net_rsc_drain_flow(chain, nc, buf, size,
2387 ((hdr_len + sizeof(struct eth_header)) + 8),
2388 VIRTIO_NET_IP6_ADDR_SIZE,
2389 hdr_len + sizeof(struct eth_header)
2390 + sizeof(struct ip6_header));
2391 }
2392
2393 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit);
2394 }
2395
2396 static VirtioNetRscChain *virtio_net_rsc_lookup_chain(VirtIONet *n,
2397 NetClientState *nc,
2398 uint16_t proto)
2399 {
2400 VirtioNetRscChain *chain;
2401
2402 if ((proto != (uint16_t)ETH_P_IP) && (proto != (uint16_t)ETH_P_IPV6)) {
2403 return NULL;
2404 }
2405
2406 QTAILQ_FOREACH(chain, &n->rsc_chains, next) {
2407 if (chain->proto == proto) {
2408 return chain;
2409 }
2410 }
2411
2412 chain = g_malloc(sizeof(*chain));
2413 chain->n = n;
2414 chain->proto = proto;
2415 if (proto == (uint16_t)ETH_P_IP) {
2416 chain->max_payload = VIRTIO_NET_MAX_IP4_PAYLOAD;
2417 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2418 } else {
2419 chain->max_payload = VIRTIO_NET_MAX_IP6_PAYLOAD;
2420 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2421 }
2422 chain->drain_timer = timer_new_ns(QEMU_CLOCK_HOST,
2423 virtio_net_rsc_purge, chain);
2424 memset(&chain->stat, 0, sizeof(chain->stat));
2425
2426 QTAILQ_INIT(&chain->buffers);
2427 QTAILQ_INSERT_TAIL(&n->rsc_chains, chain, next);
2428
2429 return chain;
2430 }
2431
2432 static ssize_t virtio_net_rsc_receive(NetClientState *nc,
2433 const uint8_t *buf,
2434 size_t size)
2435 {
2436 uint16_t proto;
2437 VirtioNetRscChain *chain;
2438 struct eth_header *eth;
2439 VirtIONet *n;
2440
2441 n = qemu_get_nic_opaque(nc);
2442 if (size < (n->host_hdr_len + sizeof(struct eth_header))) {
2443 return virtio_net_do_receive(nc, buf, size);
2444 }
2445
2446 eth = (struct eth_header *)(buf + n->guest_hdr_len);
2447 proto = htons(eth->h_proto);
2448
2449 chain = virtio_net_rsc_lookup_chain(n, nc, proto);
2450 if (chain) {
2451 chain->stat.received++;
2452 if (proto == (uint16_t)ETH_P_IP && n->rsc4_enabled) {
2453 return virtio_net_rsc_receive4(chain, nc, buf, size);
2454 } else if (proto == (uint16_t)ETH_P_IPV6 && n->rsc6_enabled) {
2455 return virtio_net_rsc_receive6(chain, nc, buf, size);
2456 }
2457 }
2458 return virtio_net_do_receive(nc, buf, size);
2459 }
2460
2461 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
2462 size_t size)
2463 {
2464 VirtIONet *n = qemu_get_nic_opaque(nc);
2465 if ((n->rsc4_enabled || n->rsc6_enabled)) {
2466 return virtio_net_rsc_receive(nc, buf, size);
2467 } else {
2468 return virtio_net_do_receive(nc, buf, size);
2469 }
2470 }
2471
2472 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
2473
2474 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
2475 {
2476 VirtIONet *n = qemu_get_nic_opaque(nc);
2477 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
2478 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2479
2480 virtqueue_push(q->tx_vq, q->async_tx.elem, 0);
2481 virtio_notify(vdev, q->tx_vq);
2482
2483 g_free(q->async_tx.elem);
2484 q->async_tx.elem = NULL;
2485
2486 virtio_queue_set_notification(q->tx_vq, 1);
2487 virtio_net_flush_tx(q);
2488 }
2489
2490 /* TX */
2491 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
2492 {
2493 VirtIONet *n = q->n;
2494 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2495 VirtQueueElement *elem;
2496 int32_t num_packets = 0;
2497 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
2498 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
2499 return num_packets;
2500 }
2501
2502 if (q->async_tx.elem) {
2503 virtio_queue_set_notification(q->tx_vq, 0);
2504 return num_packets;
2505 }
2506
2507 for (;;) {
2508 ssize_t ret;
2509 unsigned int out_num;
2510 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
2511 struct virtio_net_hdr_mrg_rxbuf mhdr;
2512
2513 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
2514 if (!elem) {
2515 break;
2516 }
2517
2518 out_num = elem->out_num;
2519 out_sg = elem->out_sg;
2520 if (out_num < 1) {
2521 virtio_error(vdev, "virtio-net header not in first element");
2522 virtqueue_detach_element(q->tx_vq, elem, 0);
2523 g_free(elem);
2524 return -EINVAL;
2525 }
2526
2527 if (n->has_vnet_hdr) {
2528 if (iov_to_buf(out_sg, out_num, 0, &mhdr, n->guest_hdr_len) <
2529 n->guest_hdr_len) {
2530 virtio_error(vdev, "virtio-net header incorrect");
2531 virtqueue_detach_element(q->tx_vq, elem, 0);
2532 g_free(elem);
2533 return -EINVAL;
2534 }
2535 if (n->needs_vnet_hdr_swap) {
2536 virtio_net_hdr_swap(vdev, (void *) &mhdr);
2537 sg2[0].iov_base = &mhdr;
2538 sg2[0].iov_len = n->guest_hdr_len;
2539 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
2540 out_sg, out_num,
2541 n->guest_hdr_len, -1);
2542 if (out_num == VIRTQUEUE_MAX_SIZE) {
2543 goto drop;
2544 }
2545 out_num += 1;
2546 out_sg = sg2;
2547 }
2548 }
2549 /*
2550 * If host wants to see the guest header as is, we can
2551 * pass it on unchanged. Otherwise, copy just the parts
2552 * that host is interested in.
2553 */
2554 assert(n->host_hdr_len <= n->guest_hdr_len);
2555 if (n->host_hdr_len != n->guest_hdr_len) {
2556 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
2557 out_sg, out_num,
2558 0, n->host_hdr_len);
2559 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
2560 out_sg, out_num,
2561 n->guest_hdr_len, -1);
2562 out_num = sg_num;
2563 out_sg = sg;
2564 }
2565
2566 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
2567 out_sg, out_num, virtio_net_tx_complete);
2568 if (ret == 0) {
2569 virtio_queue_set_notification(q->tx_vq, 0);
2570 q->async_tx.elem = elem;
2571 return -EBUSY;
2572 }
2573
2574 drop:
2575 virtqueue_push(q->tx_vq, elem, 0);
2576 virtio_notify(vdev, q->tx_vq);
2577 g_free(elem);
2578
2579 if (++num_packets >= n->tx_burst) {
2580 break;
2581 }
2582 }
2583 return num_packets;
2584 }
2585
2586 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
2587 {
2588 VirtIONet *n = VIRTIO_NET(vdev);
2589 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
2590
2591 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
2592 virtio_net_drop_tx_queue_data(vdev, vq);
2593 return;
2594 }
2595
2596 /* This happens when device was stopped but VCPU wasn't. */
2597 if (!vdev->vm_running) {
2598 q->tx_waiting = 1;
2599 return;
2600 }
2601
2602 if (q->tx_waiting) {
2603 virtio_queue_set_notification(vq, 1);
2604 timer_del(q->tx_timer);
2605 q->tx_waiting = 0;
2606 if (virtio_net_flush_tx(q) == -EINVAL) {
2607 return;
2608 }
2609 } else {
2610 timer_mod(q->tx_timer,
2611 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
2612 q->tx_waiting = 1;
2613 virtio_queue_set_notification(vq, 0);
2614 }
2615 }
2616
2617 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
2618 {
2619 VirtIONet *n = VIRTIO_NET(vdev);
2620 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
2621
2622 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
2623 virtio_net_drop_tx_queue_data(vdev, vq);
2624 return;
2625 }
2626
2627 if (unlikely(q->tx_waiting)) {
2628 return;
2629 }
2630 q->tx_waiting = 1;
2631 /* This happens when device was stopped but VCPU wasn't. */
2632 if (!vdev->vm_running) {
2633 return;
2634 }
2635 virtio_queue_set_notification(vq, 0);
2636 qemu_bh_schedule(q->tx_bh);
2637 }
2638
2639 static void virtio_net_tx_timer(void *opaque)
2640 {
2641 VirtIONetQueue *q = opaque;
2642 VirtIONet *n = q->n;
2643 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2644 /* This happens when device was stopped but BH wasn't. */
2645 if (!vdev->vm_running) {
2646 /* Make sure tx waiting is set, so we'll run when restarted. */
2647 assert(q->tx_waiting);
2648 return;
2649 }
2650
2651 q->tx_waiting = 0;
2652
2653 /* Just in case the driver is not ready on more */
2654 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
2655 return;
2656 }
2657
2658 virtio_queue_set_notification(q->tx_vq, 1);
2659 virtio_net_flush_tx(q);
2660 }
2661
2662 static void virtio_net_tx_bh(void *opaque)
2663 {
2664 VirtIONetQueue *q = opaque;
2665 VirtIONet *n = q->n;
2666 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2667 int32_t ret;
2668
2669 /* This happens when device was stopped but BH wasn't. */
2670 if (!vdev->vm_running) {
2671 /* Make sure tx waiting is set, so we'll run when restarted. */
2672 assert(q->tx_waiting);
2673 return;
2674 }
2675
2676 q->tx_waiting = 0;
2677
2678 /* Just in case the driver is not ready on more */
2679 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
2680 return;
2681 }
2682
2683 ret = virtio_net_flush_tx(q);
2684 if (ret == -EBUSY || ret == -EINVAL) {
2685 return; /* Notification re-enable handled by tx_complete or device
2686 * broken */
2687 }
2688
2689 /* If we flush a full burst of packets, assume there are
2690 * more coming and immediately reschedule */
2691 if (ret >= n->tx_burst) {
2692 qemu_bh_schedule(q->tx_bh);
2693 q->tx_waiting = 1;
2694 return;
2695 }
2696
2697 /* If less than a full burst, re-enable notification and flush
2698 * anything that may have come in while we weren't looking. If
2699 * we find something, assume the guest is still active and reschedule */
2700 virtio_queue_set_notification(q->tx_vq, 1);
2701 ret = virtio_net_flush_tx(q);
2702 if (ret == -EINVAL) {
2703 return;
2704 } else if (ret > 0) {
2705 virtio_queue_set_notification(q->tx_vq, 0);
2706 qemu_bh_schedule(q->tx_bh);
2707 q->tx_waiting = 1;
2708 }
2709 }
2710
2711 static void virtio_net_add_queue(VirtIONet *n, int index)
2712 {
2713 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2714
2715 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
2716 virtio_net_handle_rx);
2717
2718 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
2719 n->vqs[index].tx_vq =
2720 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
2721 virtio_net_handle_tx_timer);
2722 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
2723 virtio_net_tx_timer,
2724 &n->vqs[index]);
2725 } else {
2726 n->vqs[index].tx_vq =
2727 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
2728 virtio_net_handle_tx_bh);
2729 n->vqs[index].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[index]);
2730 }
2731
2732 n->vqs[index].tx_waiting = 0;
2733 n->vqs[index].n = n;
2734 }
2735
2736 static void virtio_net_del_queue(VirtIONet *n, int index)
2737 {
2738 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2739 VirtIONetQueue *q = &n->vqs[index];
2740 NetClientState *nc = qemu_get_subqueue(n->nic, index);
2741
2742 qemu_purge_queued_packets(nc);
2743
2744 virtio_del_queue(vdev, index * 2);
2745 if (q->tx_timer) {
2746 timer_free(q->tx_timer);
2747 q->tx_timer = NULL;
2748 } else {
2749 qemu_bh_delete(q->tx_bh);
2750 q->tx_bh = NULL;
2751 }
2752 q->tx_waiting = 0;
2753 virtio_del_queue(vdev, index * 2 + 1);
2754 }
2755
2756 static void virtio_net_change_num_queues(VirtIONet *n, int new_max_queues)
2757 {
2758 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2759 int old_num_queues = virtio_get_num_queues(vdev);
2760 int new_num_queues = new_max_queues * 2 + 1;
2761 int i;
2762
2763 assert(old_num_queues >= 3);
2764 assert(old_num_queues % 2 == 1);
2765
2766 if (old_num_queues == new_num_queues) {
2767 return;
2768 }
2769
2770 /*
2771 * We always need to remove and add ctrl vq if
2772 * old_num_queues != new_num_queues. Remove ctrl_vq first,
2773 * and then we only enter one of the following two loops.
2774 */
2775 virtio_del_queue(vdev, old_num_queues - 1);
2776
2777 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
2778 /* new_num_queues < old_num_queues */
2779 virtio_net_del_queue(n, i / 2);
2780 }
2781
2782 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
2783 /* new_num_queues > old_num_queues */
2784 virtio_net_add_queue(n, i / 2);
2785 }
2786
2787 /* add ctrl_vq last */
2788 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
2789 }
2790
2791 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
2792 {
2793 int max = multiqueue ? n->max_queues : 1;
2794
2795 n->multiqueue = multiqueue;
2796 virtio_net_change_num_queues(n, max);
2797
2798 virtio_net_set_queues(n);
2799 }
2800
2801 static int virtio_net_post_load_device(void *opaque, int version_id)
2802 {
2803 VirtIONet *n = opaque;
2804 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2805 int i, link_down;
2806
2807 trace_virtio_net_post_load_device();
2808 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs,
2809 virtio_vdev_has_feature(vdev,
2810 VIRTIO_F_VERSION_1),
2811 virtio_vdev_has_feature(vdev,
2812 VIRTIO_NET_F_HASH_REPORT));
2813
2814 /* MAC_TABLE_ENTRIES may be different from the saved image */
2815 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) {
2816 n->mac_table.in_use = 0;
2817 }
2818
2819 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
2820 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
2821 }
2822
2823 /*
2824 * curr_guest_offloads will be later overwritten by the
2825 * virtio_set_features_nocheck call done from the virtio_load.
2826 * Here we make sure it is preserved and restored accordingly
2827 * in the virtio_net_post_load_virtio callback.
2828 */
2829 n->saved_guest_offloads = n->curr_guest_offloads;
2830
2831 virtio_net_set_queues(n);
2832
2833 /* Find the first multicast entry in the saved MAC filter */
2834 for (i = 0; i < n->mac_table.in_use; i++) {
2835 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
2836 break;
2837 }
2838 }
2839 n->mac_table.first_multi = i;
2840
2841 /* nc.link_down can't be migrated, so infer link_down according
2842 * to link status bit in n->status */
2843 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
2844 for (i = 0; i < n->max_queues; i++) {
2845 qemu_get_subqueue(n->nic, i)->link_down = link_down;
2846 }
2847
2848 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
2849 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
2850 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(),
2851 QEMU_CLOCK_VIRTUAL,
2852 virtio_net_announce_timer, n);
2853 if (n->announce_timer.round) {
2854 timer_mod(n->announce_timer.tm,
2855 qemu_clock_get_ms(n->announce_timer.type));
2856 } else {
2857 qemu_announce_timer_del(&n->announce_timer, false);
2858 }
2859 }
2860
2861 if (n->rss_data.enabled) {
2862 n->rss_data.enabled_software_rss = n->rss_data.populate_hash;
2863 if (!n->rss_data.populate_hash) {
2864 if (!virtio_net_attach_epbf_rss(n)) {
2865 if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
2866 warn_report("Can't post-load eBPF RSS for vhost");
2867 } else {
2868 warn_report("Can't post-load eBPF RSS - "
2869 "fallback to software RSS");
2870 n->rss_data.enabled_software_rss = true;
2871 }
2872 }
2873 }
2874
2875 trace_virtio_net_rss_enable(n->rss_data.hash_types,
2876 n->rss_data.indirections_len,
2877 sizeof(n->rss_data.key));
2878 } else {
2879 trace_virtio_net_rss_disable();
2880 }
2881 return 0;
2882 }
2883
2884 static int virtio_net_post_load_virtio(VirtIODevice *vdev)
2885 {
2886 VirtIONet *n = VIRTIO_NET(vdev);
2887 /*
2888 * The actual needed state is now in saved_guest_offloads,
2889 * see virtio_net_post_load_device for detail.
2890 * Restore it back and apply the desired offloads.
2891 */
2892 n->curr_guest_offloads = n->saved_guest_offloads;
2893 if (peer_has_vnet_hdr(n)) {
2894 virtio_net_apply_guest_offloads(n);
2895 }
2896
2897 return 0;
2898 }
2899
2900 /* tx_waiting field of a VirtIONetQueue */
2901 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = {
2902 .name = "virtio-net-queue-tx_waiting",
2903 .fields = (VMStateField[]) {
2904 VMSTATE_UINT32(tx_waiting, VirtIONetQueue),
2905 VMSTATE_END_OF_LIST()
2906 },
2907 };
2908
2909 static bool max_queues_gt_1(void *opaque, int version_id)
2910 {
2911 return VIRTIO_NET(opaque)->max_queues > 1;
2912 }
2913
2914 static bool has_ctrl_guest_offloads(void *opaque, int version_id)
2915 {
2916 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque),
2917 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
2918 }
2919
2920 static bool mac_table_fits(void *opaque, int version_id)
2921 {
2922 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES;
2923 }
2924
2925 static bool mac_table_doesnt_fit(void *opaque, int version_id)
2926 {
2927 return !mac_table_fits(opaque, version_id);
2928 }
2929
2930 /* This temporary type is shared by all the WITH_TMP methods
2931 * although only some fields are used by each.
2932 */
2933 struct VirtIONetMigTmp {
2934 VirtIONet *parent;
2935 VirtIONetQueue *vqs_1;
2936 uint16_t curr_queues_1;
2937 uint8_t has_ufo;
2938 uint32_t has_vnet_hdr;
2939 };
2940
2941 /* The 2nd and subsequent tx_waiting flags are loaded later than
2942 * the 1st entry in the queues and only if there's more than one
2943 * entry. We use the tmp mechanism to calculate a temporary
2944 * pointer and count and also validate the count.
2945 */
2946
2947 static int virtio_net_tx_waiting_pre_save(void *opaque)
2948 {
2949 struct VirtIONetMigTmp *tmp = opaque;
2950
2951 tmp->vqs_1 = tmp->parent->vqs + 1;
2952 tmp->curr_queues_1 = tmp->parent->curr_queues - 1;
2953 if (tmp->parent->curr_queues == 0) {
2954 tmp->curr_queues_1 = 0;
2955 }
2956
2957 return 0;
2958 }
2959
2960 static int virtio_net_tx_waiting_pre_load(void *opaque)
2961 {
2962 struct VirtIONetMigTmp *tmp = opaque;
2963
2964 /* Reuse the pointer setup from save */
2965 virtio_net_tx_waiting_pre_save(opaque);
2966
2967 if (tmp->parent->curr_queues > tmp->parent->max_queues) {
2968 error_report("virtio-net: curr_queues %x > max_queues %x",
2969 tmp->parent->curr_queues, tmp->parent->max_queues);
2970
2971 return -EINVAL;
2972 }
2973
2974 return 0; /* all good */
2975 }
2976
2977 static const VMStateDescription vmstate_virtio_net_tx_waiting = {
2978 .name = "virtio-net-tx_waiting",
2979 .pre_load = virtio_net_tx_waiting_pre_load,
2980 .pre_save = virtio_net_tx_waiting_pre_save,
2981 .fields = (VMStateField[]) {
2982 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp,
2983 curr_queues_1,
2984 vmstate_virtio_net_queue_tx_waiting,
2985 struct VirtIONetQueue),
2986 VMSTATE_END_OF_LIST()
2987 },
2988 };
2989
2990 /* the 'has_ufo' flag is just tested; if the incoming stream has the
2991 * flag set we need to check that we have it
2992 */
2993 static int virtio_net_ufo_post_load(void *opaque, int version_id)
2994 {
2995 struct VirtIONetMigTmp *tmp = opaque;
2996
2997 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) {
2998 error_report("virtio-net: saved image requires TUN_F_UFO support");
2999 return -EINVAL;
3000 }
3001
3002 return 0;
3003 }
3004
3005 static int virtio_net_ufo_pre_save(void *opaque)
3006 {
3007 struct VirtIONetMigTmp *tmp = opaque;
3008
3009 tmp->has_ufo = tmp->parent->has_ufo;
3010
3011 return 0;
3012 }
3013
3014 static const VMStateDescription vmstate_virtio_net_has_ufo = {
3015 .name = "virtio-net-ufo",
3016 .post_load = virtio_net_ufo_post_load,
3017 .pre_save = virtio_net_ufo_pre_save,
3018 .fields = (VMStateField[]) {
3019 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp),
3020 VMSTATE_END_OF_LIST()
3021 },
3022 };
3023
3024 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
3025 * flag set we need to check that we have it
3026 */
3027 static int virtio_net_vnet_post_load(void *opaque, int version_id)
3028 {
3029 struct VirtIONetMigTmp *tmp = opaque;
3030
3031 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) {
3032 error_report("virtio-net: saved image requires vnet_hdr=on");
3033 return -EINVAL;
3034 }
3035
3036 return 0;
3037 }
3038
3039 static int virtio_net_vnet_pre_save(void *opaque)
3040 {
3041 struct VirtIONetMigTmp *tmp = opaque;
3042
3043 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
3044
3045 return 0;
3046 }
3047
3048 static const VMStateDescription vmstate_virtio_net_has_vnet = {
3049 .name = "virtio-net-vnet",
3050 .post_load = virtio_net_vnet_post_load,
3051 .pre_save = virtio_net_vnet_pre_save,
3052 .fields = (VMStateField[]) {
3053 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp),
3054 VMSTATE_END_OF_LIST()
3055 },
3056 };
3057
3058 static bool virtio_net_rss_needed(void *opaque)
3059 {
3060 return VIRTIO_NET(opaque)->rss_data.enabled;
3061 }
3062
3063 static const VMStateDescription vmstate_virtio_net_rss = {
3064 .name = "virtio-net-device/rss",
3065 .version_id = 1,
3066 .minimum_version_id = 1,
3067 .needed = virtio_net_rss_needed,
3068 .fields = (VMStateField[]) {
3069 VMSTATE_BOOL(rss_data.enabled, VirtIONet),
3070 VMSTATE_BOOL(rss_data.redirect, VirtIONet),
3071 VMSTATE_BOOL(rss_data.populate_hash, VirtIONet),
3072 VMSTATE_UINT32(rss_data.hash_types, VirtIONet),
3073 VMSTATE_UINT16(rss_data.indirections_len, VirtIONet),
3074 VMSTATE_UINT16(rss_data.default_queue, VirtIONet),
3075 VMSTATE_UINT8_ARRAY(rss_data.key, VirtIONet,
3076 VIRTIO_NET_RSS_MAX_KEY_SIZE),
3077 VMSTATE_VARRAY_UINT16_ALLOC(rss_data.indirections_table, VirtIONet,
3078 rss_data.indirections_len, 0,
3079 vmstate_info_uint16, uint16_t),
3080 VMSTATE_END_OF_LIST()
3081 },
3082 };
3083
3084 static const VMStateDescription vmstate_virtio_net_device = {
3085 .name = "virtio-net-device",
3086 .version_id = VIRTIO_NET_VM_VERSION,
3087 .minimum_version_id = VIRTIO_NET_VM_VERSION,
3088 .post_load = virtio_net_post_load_device,
3089 .fields = (VMStateField[]) {
3090 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN),
3091 VMSTATE_STRUCT_POINTER(vqs, VirtIONet,
3092 vmstate_virtio_net_queue_tx_waiting,
3093 VirtIONetQueue),
3094 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet),
3095 VMSTATE_UINT16(status, VirtIONet),
3096 VMSTATE_UINT8(promisc, VirtIONet),
3097 VMSTATE_UINT8(allmulti, VirtIONet),
3098 VMSTATE_UINT32(mac_table.in_use, VirtIONet),
3099
3100 /* Guarded pair: If it fits we load it, else we throw it away
3101 * - can happen if source has a larger MAC table.; post-load
3102 * sets flags in this case.
3103 */
3104 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet,
3105 0, mac_table_fits, mac_table.in_use,
3106 ETH_ALEN),
3107 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0,
3108 mac_table.in_use, ETH_ALEN),
3109
3110 /* Note: This is an array of uint32's that's always been saved as a
3111 * buffer; hold onto your endiannesses; it's actually used as a bitmap
3112 * but based on the uint.
3113 */
3114 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3),
3115 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
3116 vmstate_virtio_net_has_vnet),
3117 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet),
3118 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet),
3119 VMSTATE_UINT8(alluni, VirtIONet),
3120 VMSTATE_UINT8(nomulti, VirtIONet),
3121 VMSTATE_UINT8(nouni, VirtIONet),
3122 VMSTATE_UINT8(nobcast, VirtIONet),
3123 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
3124 vmstate_virtio_net_has_ufo),
3125 VMSTATE_SINGLE_TEST(max_queues, VirtIONet, max_queues_gt_1, 0,
3126 vmstate_info_uint16_equal, uint16_t),
3127 VMSTATE_UINT16_TEST(curr_queues, VirtIONet, max_queues_gt_1),
3128 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
3129 vmstate_virtio_net_tx_waiting),
3130 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet,
3131 has_ctrl_guest_offloads),
3132 VMSTATE_END_OF_LIST()
3133 },
3134 .subsections = (const VMStateDescription * []) {
3135 &vmstate_virtio_net_rss,
3136 NULL
3137 }
3138 };
3139
3140 static NetClientInfo net_virtio_info = {
3141 .type = NET_CLIENT_DRIVER_NIC,
3142 .size = sizeof(NICState),
3143 .can_receive = virtio_net_can_receive,
3144 .receive = virtio_net_receive,
3145 .link_status_changed = virtio_net_set_link_status,
3146 .query_rx_filter = virtio_net_query_rxfilter,
3147 .announce = virtio_net_announce,
3148 };
3149
3150 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
3151 {
3152 VirtIONet *n = VIRTIO_NET(vdev);
3153 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
3154 assert(n->vhost_started);
3155 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
3156 }
3157
3158 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
3159 bool mask)
3160 {
3161 VirtIONet *n = VIRTIO_NET(vdev);
3162 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
3163 assert(n->vhost_started);
3164 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
3165 vdev, idx, mask);
3166 }
3167
3168 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
3169 {
3170 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
3171
3172 n->config_size = virtio_feature_get_config_size(feature_sizes,
3173 host_features);
3174 }
3175
3176 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
3177 const char *type)
3178 {
3179 /*
3180 * The name can be NULL, the netclient name will be type.x.
3181 */
3182 assert(type != NULL);
3183
3184 g_free(n->netclient_name);
3185 g_free(n->netclient_type);
3186 n->netclient_name = g_strdup(name);
3187 n->netclient_type = g_strdup(type);
3188 }
3189
3190 static bool failover_unplug_primary(VirtIONet *n, DeviceState *dev)
3191 {
3192 HotplugHandler *hotplug_ctrl;
3193 PCIDevice *pci_dev;
3194 Error *err = NULL;
3195
3196 hotplug_ctrl = qdev_get_hotplug_handler(dev);
3197 if (hotplug_ctrl) {
3198 pci_dev = PCI_DEVICE(dev);
3199 pci_dev->partially_hotplugged = true;
3200 hotplug_handler_unplug_request(hotplug_ctrl, dev, &err);
3201 if (err) {
3202 error_report_err(err);
3203 return false;
3204 }
3205 } else {
3206 return false;
3207 }
3208 return true;
3209 }
3210
3211 static bool failover_replug_primary(VirtIONet *n, DeviceState *dev,
3212 Error **errp)
3213 {
3214 Error *err = NULL;
3215 HotplugHandler *hotplug_ctrl;
3216 PCIDevice *pdev = PCI_DEVICE(dev);
3217 BusState *primary_bus;
3218
3219 if (!pdev->partially_hotplugged) {
3220 return true;
3221 }
3222 primary_bus = dev->parent_bus;
3223 if (!primary_bus) {
3224 error_setg(errp, "virtio_net: couldn't find primary bus");
3225 return false;
3226 }
3227 qdev_set_parent_bus(dev, primary_bus, &error_abort);
3228 qatomic_set(&n->failover_primary_hidden, false);
3229 hotplug_ctrl = qdev_get_hotplug_handler(dev);
3230 if (hotplug_ctrl) {
3231 hotplug_handler_pre_plug(hotplug_ctrl, dev, &err);
3232 if (err) {
3233 goto out;
3234 }
3235 hotplug_handler_plug(hotplug_ctrl, dev, &err);
3236 }
3237
3238 out:
3239 error_propagate(errp, err);
3240 return !err;
3241 }
3242
3243 static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
3244 {
3245 bool should_be_hidden;
3246 Error *err = NULL;
3247 DeviceState *dev = failover_find_primary_device(n);
3248
3249 if (!dev) {
3250 return;
3251 }
3252
3253 should_be_hidden = qatomic_read(&n->failover_primary_hidden);
3254
3255 if (migration_in_setup(s) && !should_be_hidden) {
3256 if (failover_unplug_primary(n, dev)) {
3257 vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev);
3258 qapi_event_send_unplug_primary(dev->id);
3259 qatomic_set(&n->failover_primary_hidden, true);
3260 } else {
3261 warn_report("couldn't unplug primary device");
3262 }
3263 } else if (migration_has_failed(s)) {
3264 /* We already unplugged the device let's plug it back */
3265 if (!failover_replug_primary(n, dev, &err)) {
3266 if (err) {
3267 error_report_err(err);
3268 }
3269 }
3270 }
3271 }
3272
3273 static void virtio_net_migration_state_notifier(Notifier *notifier, void *data)
3274 {
3275 MigrationState *s = data;
3276 VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
3277 virtio_net_handle_migration_primary(n, s);
3278 }
3279
3280 static bool failover_hide_primary_device(DeviceListener *listener,
3281 QemuOpts *device_opts)
3282 {
3283 VirtIONet *n = container_of(listener, VirtIONet, primary_listener);
3284 const char *standby_id;
3285
3286 if (!device_opts) {
3287 return false;
3288 }
3289 standby_id = qemu_opt_get(device_opts, "failover_pair_id");
3290 if (g_strcmp0(standby_id, n->netclient_name) != 0) {
3291 return false;
3292 }
3293
3294 /* failover_primary_hidden is set during feature negotiation */
3295 return qatomic_read(&n->failover_primary_hidden);
3296 }
3297
3298 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
3299 {
3300 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
3301 VirtIONet *n = VIRTIO_NET(dev);
3302 NetClientState *nc;
3303 int i;
3304
3305 if (n->net_conf.mtu) {
3306 n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
3307 }
3308
3309 if (n->net_conf.duplex_str) {
3310 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
3311 n->net_conf.duplex = DUPLEX_HALF;
3312 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
3313 n->net_conf.duplex = DUPLEX_FULL;
3314 } else {
3315 error_setg(errp, "'duplex' must be 'half' or 'full'");
3316 return;
3317 }
3318 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
3319 } else {
3320 n->net_conf.duplex = DUPLEX_UNKNOWN;
3321 }
3322
3323 if (n->net_conf.speed < SPEED_UNKNOWN) {
3324 error_setg(errp, "'speed' must be between 0 and INT_MAX");
3325 return;
3326 }
3327 if (n->net_conf.speed >= 0) {
3328 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
3329 }
3330
3331 if (n->failover) {
3332 n->primary_listener.hide_device = failover_hide_primary_device;
3333 qatomic_set(&n->failover_primary_hidden, true);
3334 device_listener_register(&n->primary_listener);
3335 n->migration_state.notify = virtio_net_migration_state_notifier;
3336 add_migration_state_change_notifier(&n->migration_state);
3337 n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY);
3338 }
3339
3340 virtio_net_set_config_size(n, n->host_features);
3341 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
3342
3343 /*
3344 * We set a lower limit on RX queue size to what it always was.
3345 * Guests that want a smaller ring can always resize it without
3346 * help from us (using virtio 1 and up).
3347 */
3348 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||
3349 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||
3350 !is_power_of_2(n->net_conf.rx_queue_size)) {
3351 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "
3352 "must be a power of 2 between %d and %d.",
3353 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,
3354 VIRTQUEUE_MAX_SIZE);
3355 virtio_cleanup(vdev);
3356 return;
3357 }
3358
3359 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE ||
3360 n->net_conf.tx_queue_size > VIRTQUEUE_MAX_SIZE ||
3361 !is_power_of_2(n->net_conf.tx_queue_size)) {
3362 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), "
3363 "must be a power of 2 between %d and %d",
3364 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE,
3365 VIRTQUEUE_MAX_SIZE);
3366 virtio_cleanup(vdev);
3367 return;
3368 }
3369
3370 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
3371 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
3372 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
3373 "must be a positive integer less than %d.",
3374 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
3375 virtio_cleanup(vdev);
3376 return;
3377 }
3378 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
3379 n->curr_queues = 1;
3380 n->tx_timeout = n->net_conf.txtimer;
3381
3382 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
3383 && strcmp(n->net_conf.tx, "bh")) {
3384 warn_report("virtio-net: "
3385 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
3386 n->net_conf.tx);
3387 error_printf("Defaulting to \"bh\"");
3388 }
3389
3390 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
3391 n->net_conf.tx_queue_size);
3392
3393 for (i = 0; i < n->max_queues; i++) {
3394 virtio_net_add_queue(n, i);
3395 }
3396
3397 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
3398 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
3399 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
3400 n->status = VIRTIO_NET_S_LINK_UP;
3401 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(),
3402 QEMU_CLOCK_VIRTUAL,
3403 virtio_net_announce_timer, n);
3404 n->announce_timer.round = 0;
3405
3406 if (n->netclient_type) {
3407 /*
3408 * Happen when virtio_net_set_netclient_name has been called.
3409 */
3410 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
3411 n->netclient_type, n->netclient_name, n);
3412 } else {
3413 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
3414 object_get_typename(OBJECT(dev)), dev->id, n);
3415 }
3416
3417 for (i = 0; i < n->max_queues; i++) {
3418 n->nic->ncs[i].do_not_pad = true;
3419 }
3420
3421 peer_test_vnet_hdr(n);
3422 if (peer_has_vnet_hdr(n)) {
3423 for (i = 0; i < n->max_queues; i++) {
3424 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
3425 }
3426 n->host_hdr_len = sizeof(struct virtio_net_hdr);
3427 } else {
3428 n->host_hdr_len = 0;
3429 }
3430
3431 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
3432
3433 n->vqs[0].tx_waiting = 0;
3434 n->tx_burst = n->net_conf.txburst;
3435 virtio_net_set_mrg_rx_bufs(n, 0, 0, 0);
3436 n->promisc = 1; /* for compatibility */
3437
3438 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
3439
3440 n->vlans = g_malloc0(MAX_VLAN >> 3);
3441
3442 nc = qemu_get_queue(n->nic);
3443 nc->rxfilter_notify_enabled = 1;
3444
3445 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
3446 struct virtio_net_config netcfg = {};
3447 memcpy(&netcfg.mac, &n->nic_conf.macaddr, ETH_ALEN);
3448 vhost_net_set_config(get_vhost_net(nc->peer),
3449 (uint8_t *)&netcfg, 0, ETH_ALEN, VHOST_SET_CONFIG_TYPE_MASTER);
3450 }
3451 QTAILQ_INIT(&n->rsc_chains);
3452 n->qdev = dev;
3453
3454 net_rx_pkt_init(&n->rx_pkt, false);
3455
3456 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
3457 virtio_net_load_ebpf(n);
3458 }
3459 }
3460
3461 static void virtio_net_device_unrealize(DeviceState *dev)
3462 {
3463 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
3464 VirtIONet *n = VIRTIO_NET(dev);
3465 int i, max_queues;
3466
3467 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
3468 virtio_net_unload_ebpf(n);
3469 }
3470
3471 /* This will stop vhost backend if appropriate. */
3472 virtio_net_set_status(vdev, 0);
3473
3474 g_free(n->netclient_name);
3475 n->netclient_name = NULL;
3476 g_free(n->netclient_type);
3477 n->netclient_type = NULL;
3478
3479 g_free(n->mac_table.macs);
3480 g_free(n->vlans);
3481
3482 if (n->failover) {
3483 device_listener_unregister(&n->primary_listener);
3484 remove_migration_state_change_notifier(&n->migration_state);
3485 }
3486
3487 max_queues = n->multiqueue ? n->max_queues : 1;
3488 for (i = 0; i < max_queues; i++) {
3489 virtio_net_del_queue(n, i);
3490 }
3491 /* delete also control vq */
3492 virtio_del_queue(vdev, max_queues * 2);
3493 qemu_announce_timer_del(&n->announce_timer, false);
3494 g_free(n->vqs);
3495 qemu_del_nic(n->nic);
3496 virtio_net_rsc_cleanup(n);
3497 g_free(n->rss_data.indirections_table);
3498 net_rx_pkt_uninit(n->rx_pkt);
3499 virtio_cleanup(vdev);
3500 }
3501
3502 static void virtio_net_instance_init(Object *obj)
3503 {
3504 VirtIONet *n = VIRTIO_NET(obj);
3505
3506 /*
3507 * The default config_size is sizeof(struct virtio_net_config).
3508 * Can be overriden with virtio_net_set_config_size.
3509 */
3510 n->config_size = sizeof(struct virtio_net_config);
3511 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
3512 "bootindex", "/ethernet-phy@0",
3513 DEVICE(n));
3514
3515 ebpf_rss_init(&n->ebpf_rss);
3516 }
3517
3518 static int virtio_net_pre_save(void *opaque)
3519 {
3520 VirtIONet *n = opaque;
3521
3522 /* At this point, backend must be stopped, otherwise
3523 * it might keep writing to memory. */
3524 assert(!n->vhost_started);
3525
3526 return 0;
3527 }
3528
3529 static bool primary_unplug_pending(void *opaque)
3530 {
3531 DeviceState *dev = opaque;
3532 DeviceState *primary;
3533 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
3534 VirtIONet *n = VIRTIO_NET(vdev);
3535
3536 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3537 return false;
3538 }
3539 primary = failover_find_primary_device(n);
3540 return primary ? primary->pending_deleted_event : false;
3541 }
3542
3543 static bool dev_unplug_pending(void *opaque)
3544 {
3545 DeviceState *dev = opaque;
3546 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
3547
3548 return vdc->primary_unplug_pending(dev);
3549 }
3550
3551 static const VMStateDescription vmstate_virtio_net = {
3552 .name = "virtio-net",
3553 .minimum_version_id = VIRTIO_NET_VM_VERSION,
3554 .version_id = VIRTIO_NET_VM_VERSION,
3555 .fields = (VMStateField[]) {
3556 VMSTATE_VIRTIO_DEVICE,
3557 VMSTATE_END_OF_LIST()
3558 },
3559 .pre_save = virtio_net_pre_save,
3560 .dev_unplug_pending = dev_unplug_pending,
3561 };
3562
3563 static Property virtio_net_properties[] = {
3564 DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
3565 VIRTIO_NET_F_CSUM, true),
3566 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
3567 VIRTIO_NET_F_GUEST_CSUM, true),
3568 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
3569 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
3570 VIRTIO_NET_F_GUEST_TSO4, true),
3571 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
3572 VIRTIO_NET_F_GUEST_TSO6, true),
3573 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
3574 VIRTIO_NET_F_GUEST_ECN, true),
3575 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
3576 VIRTIO_NET_F_GUEST_UFO, true),
3577 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
3578 VIRTIO_NET_F_GUEST_ANNOUNCE, true),
3579 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
3580 VIRTIO_NET_F_HOST_TSO4, true),
3581 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
3582 VIRTIO_NET_F_HOST_TSO6, true),
3583 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
3584 VIRTIO_NET_F_HOST_ECN, true),
3585 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
3586 VIRTIO_NET_F_HOST_UFO, true),
3587 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
3588 VIRTIO_NET_F_MRG_RXBUF, true),
3589 DEFINE_PROP_BIT64("status", VirtIONet, host_features,
3590 VIRTIO_NET_F_STATUS, true),
3591 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
3592 VIRTIO_NET_F_CTRL_VQ, true),
3593 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
3594 VIRTIO_NET_F_CTRL_RX, true),
3595 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
3596 VIRTIO_NET_F_CTRL_VLAN, true),
3597 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
3598 VIRTIO_NET_F_CTRL_RX_EXTRA, true),
3599 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
3600 VIRTIO_NET_F_CTRL_MAC_ADDR, true),
3601 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
3602 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
3603 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
3604 DEFINE_PROP_BIT64("rss", VirtIONet, host_features,
3605 VIRTIO_NET_F_RSS, false),
3606 DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
3607 VIRTIO_NET_F_HASH_REPORT, false),
3608 DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
3609 VIRTIO_NET_F_RSC_EXT, false),
3610 DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
3611 VIRTIO_NET_RSC_DEFAULT_INTERVAL),
3612 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
3613 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
3614 TX_TIMER_INTERVAL),
3615 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
3616 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
3617 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
3618 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
3619 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
3620 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
3621 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
3622 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
3623 true),
3624 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
3625 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
3626 DEFINE_PROP_BOOL("failover", VirtIONet, failover, false),
3627 DEFINE_PROP_END_OF_LIST(),
3628 };
3629
3630 static void virtio_net_class_init(ObjectClass *klass, void *data)
3631 {
3632 DeviceClass *dc = DEVICE_CLASS(klass);
3633 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
3634
3635 device_class_set_props(dc, virtio_net_properties);
3636 dc->vmsd = &vmstate_virtio_net;
3637 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
3638 vdc->realize = virtio_net_device_realize;
3639 vdc->unrealize = virtio_net_device_unrealize;
3640 vdc->get_config = virtio_net_get_config;
3641 vdc->set_config = virtio_net_set_config;
3642 vdc->get_features = virtio_net_get_features;
3643 vdc->set_features = virtio_net_set_features;
3644 vdc->bad_features = virtio_net_bad_features;
3645 vdc->reset = virtio_net_reset;
3646 vdc->set_status = virtio_net_set_status;
3647 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
3648 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
3649 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
3650 vdc->post_load = virtio_net_post_load_virtio;
3651 vdc->vmsd = &vmstate_virtio_net_device;
3652 vdc->primary_unplug_pending = primary_unplug_pending;
3653 }
3654
3655 static const TypeInfo virtio_net_info = {
3656 .name = TYPE_VIRTIO_NET,
3657 .parent = TYPE_VIRTIO_DEVICE,
3658 .instance_size = sizeof(VirtIONet),
3659 .instance_init = virtio_net_instance_init,
3660 .class_init = virtio_net_class_init,
3661 };
3662
3663 static void virtio_register_types(void)
3664 {
3665 type_register_static(&virtio_net_info);
3666 }
3667
3668 type_init(virtio_register_types)
AR7 emulation for QEMU