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Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into...
[qemu/armbru.git] / hw / net / virtio-net.c
blob9959f1932b1b809c7d08d6dd25f86f76262ee7be
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/log.h"
18 #include "qemu/main-loop.h"
19 #include "qemu/module.h"
20 #include "hw/virtio/virtio.h"
21 #include "net/net.h"
22 #include "net/checksum.h"
23 #include "net/tap.h"
24 #include "qemu/error-report.h"
25 #include "qemu/timer.h"
26 #include "qemu/option.h"
27 #include "qemu/option_int.h"
28 #include "qemu/config-file.h"
29 #include "qapi/qmp/qdict.h"
30 #include "hw/virtio/virtio-net.h"
31 #include "net/vhost_net.h"
32 #include "net/announce.h"
33 #include "hw/virtio/virtio-bus.h"
34 #include "qapi/error.h"
35 #include "qapi/qapi-events-net.h"
36 #include "hw/qdev-properties.h"
37 #include "qapi/qapi-types-migration.h"
38 #include "qapi/qapi-events-migration.h"
39 #include "hw/virtio/virtio-access.h"
40 #include "migration/misc.h"
41 #include "standard-headers/linux/ethtool.h"
42 #include "sysemu/sysemu.h"
43 #include "trace.h"
44 #include "monitor/qdev.h"
45 #include "monitor/monitor.h"
46 #include "hw/pci/pci_device.h"
47 #include "net_rx_pkt.h"
48 #include "hw/virtio/vhost.h"
49 #include "sysemu/qtest.h"
50
51 #define VIRTIO_NET_VM_VERSION 11
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 queue_pairs; 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 const VirtIOConfigSizeParams cfg_size_params = {
109 .min_size = endof(struct virtio_net_config, mac),
110 .max_size = sizeof(struct virtio_net_config),
111 .feature_sizes = feature_sizes
112 };
113
114 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
115 {
116 VirtIONet *n = qemu_get_nic_opaque(nc);
117
118 return &n->vqs[nc->queue_index];
119 }
120
121 static int vq2q(int queue_index)
122 {
123 return queue_index / 2;
124 }
125
126 static void flush_or_purge_queued_packets(NetClientState *nc)
127 {
128 if (!nc->peer) {
129 return;
130 }
131
132 qemu_flush_or_purge_queued_packets(nc->peer, true);
133 assert(!virtio_net_get_subqueue(nc)->async_tx.elem);
134 }
135
136 /* TODO
137 * - we could suppress RX interrupt if we were so inclined.
138 */
139
140 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
141 {
142 VirtIONet *n = VIRTIO_NET(vdev);
143 struct virtio_net_config netcfg;
144 NetClientState *nc = qemu_get_queue(n->nic);
145 static const MACAddr zero = { .a = { 0, 0, 0, 0, 0, 0 } };
146
147 int ret = 0;
148 memset(&netcfg, 0 , sizeof(struct virtio_net_config));
149 virtio_stw_p(vdev, &netcfg.status, n->status);
150 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queue_pairs);
151 virtio_stw_p(vdev, &netcfg.mtu, n->net_conf.mtu);
152 memcpy(netcfg.mac, n->mac, ETH_ALEN);
153 virtio_stl_p(vdev, &netcfg.speed, n->net_conf.speed);
154 netcfg.duplex = n->net_conf.duplex;
155 netcfg.rss_max_key_size = VIRTIO_NET_RSS_MAX_KEY_SIZE;
156 virtio_stw_p(vdev, &netcfg.rss_max_indirection_table_length,
157 virtio_host_has_feature(vdev, VIRTIO_NET_F_RSS) ?
158 VIRTIO_NET_RSS_MAX_TABLE_LEN : 1);
159 virtio_stl_p(vdev, &netcfg.supported_hash_types,
160 VIRTIO_NET_RSS_SUPPORTED_HASHES);
161 memcpy(config, &netcfg, n->config_size);
162
163 /*
164 * Is this VDPA? No peer means not VDPA: there's no way to
165 * disconnect/reconnect a VDPA peer.
166 */
167 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
168 ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
169 n->config_size);
170 if (ret == -1) {
171 return;
172 }
173
174 /*
175 * Some NIC/kernel combinations present 0 as the mac address. As that
176 * is not a legal address, try to proceed with the address from the
177 * QEMU command line in the hope that the address has been configured
178 * correctly elsewhere - just not reported by the device.
179 */
180 if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) {
181 info_report("Zero hardware mac address detected. Ignoring.");
182 memcpy(netcfg.mac, n->mac, ETH_ALEN);
183 }
184
185 netcfg.status |= virtio_tswap16(vdev,
186 n->status & VIRTIO_NET_S_ANNOUNCE);
187 memcpy(config, &netcfg, n->config_size);
188 }
189 }
190
191 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
192 {
193 VirtIONet *n = VIRTIO_NET(vdev);
194 struct virtio_net_config netcfg = {};
195 NetClientState *nc = qemu_get_queue(n->nic);
196
197 memcpy(&netcfg, config, n->config_size);
198
199 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
200 !virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1) &&
201 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
202 memcpy(n->mac, netcfg.mac, ETH_ALEN);
203 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
204 }
205
206 /*
207 * Is this VDPA? No peer means not VDPA: there's no way to
208 * disconnect/reconnect a VDPA peer.
209 */
210 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
211 vhost_net_set_config(get_vhost_net(nc->peer),
212 (uint8_t *)&netcfg, 0, n->config_size,
213 VHOST_SET_CONFIG_TYPE_FRONTEND);
214 }
215 }
216
217 static bool virtio_net_started(VirtIONet *n, uint8_t status)
218 {
219 VirtIODevice *vdev = VIRTIO_DEVICE(n);
220 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
221 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
222 }
223
224 static void virtio_net_announce_notify(VirtIONet *net)
225 {
226 VirtIODevice *vdev = VIRTIO_DEVICE(net);
227 trace_virtio_net_announce_notify();
228
229 net->status |= VIRTIO_NET_S_ANNOUNCE;
230 virtio_notify_config(vdev);
231 }
232
233 static void virtio_net_announce_timer(void *opaque)
234 {
235 VirtIONet *n = opaque;
236 trace_virtio_net_announce_timer(n->announce_timer.round);
237
238 n->announce_timer.round--;
239 virtio_net_announce_notify(n);
240 }
241
242 static void virtio_net_announce(NetClientState *nc)
243 {
244 VirtIONet *n = qemu_get_nic_opaque(nc);
245 VirtIODevice *vdev = VIRTIO_DEVICE(n);
246
247 /*
248 * Make sure the virtio migration announcement timer isn't running
249 * If it is, let it trigger announcement so that we do not cause
250 * confusion.
251 */
252 if (n->announce_timer.round) {
253 return;
254 }
255
256 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
257 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
258 virtio_net_announce_notify(n);
259 }
260 }
261
262 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
263 {
264 VirtIODevice *vdev = VIRTIO_DEVICE(n);
265 NetClientState *nc = qemu_get_queue(n->nic);
266 int queue_pairs = n->multiqueue ? n->max_queue_pairs : 1;
267 int cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ?
268 n->max_ncs - n->max_queue_pairs : 0;
269
270 if (!get_vhost_net(nc->peer)) {
271 return;
272 }
273
274 if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
275 !!n->vhost_started) {
276 return;
277 }
278 if (!n->vhost_started) {
279 int r, i;
280
281 if (n->needs_vnet_hdr_swap) {
282 error_report("backend does not support %s vnet headers; "
283 "falling back on userspace virtio",
284 virtio_is_big_endian(vdev) ? "BE" : "LE");
285 return;
286 }
287
288 /* Any packets outstanding? Purge them to avoid touching rings
289 * when vhost is running.
290 */
291 for (i = 0; i < queue_pairs; i++) {
292 NetClientState *qnc = qemu_get_subqueue(n->nic, i);
293
294 /* Purge both directions: TX and RX. */
295 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
296 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
297 }
298
299 if (virtio_has_feature(vdev->guest_features, VIRTIO_NET_F_MTU)) {
300 r = vhost_net_set_mtu(get_vhost_net(nc->peer), n->net_conf.mtu);
301 if (r < 0) {
302 error_report("%uBytes MTU not supported by the backend",
303 n->net_conf.mtu);
304
305 return;
306 }
307 }
308
309 n->vhost_started = 1;
310 r = vhost_net_start(vdev, n->nic->ncs, queue_pairs, cvq);
311 if (r < 0) {
312 error_report("unable to start vhost net: %d: "
313 "falling back on userspace virtio", -r);
314 n->vhost_started = 0;
315 }
316 } else {
317 vhost_net_stop(vdev, n->nic->ncs, queue_pairs, cvq);
318 n->vhost_started = 0;
319 }
320 }
321
322 static int virtio_net_set_vnet_endian_one(VirtIODevice *vdev,
323 NetClientState *peer,
324 bool enable)
325 {
326 if (virtio_is_big_endian(vdev)) {
327 return qemu_set_vnet_be(peer, enable);
328 } else {
329 return qemu_set_vnet_le(peer, enable);
330 }
331 }
332
333 static bool virtio_net_set_vnet_endian(VirtIODevice *vdev, NetClientState *ncs,
334 int queue_pairs, bool enable)
335 {
336 int i;
337
338 for (i = 0; i < queue_pairs; i++) {
339 if (virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, enable) < 0 &&
340 enable) {
341 while (--i >= 0) {
342 virtio_net_set_vnet_endian_one(vdev, ncs[i].peer, false);
343 }
344
345 return true;
346 }
347 }
348
349 return false;
350 }
351
352 static void virtio_net_vnet_endian_status(VirtIONet *n, uint8_t status)
353 {
354 VirtIODevice *vdev = VIRTIO_DEVICE(n);
355 int queue_pairs = n->multiqueue ? n->max_queue_pairs : 1;
356
357 if (virtio_net_started(n, status)) {
358 /* Before using the device, we tell the network backend about the
359 * endianness to use when parsing vnet headers. If the backend
360 * can't do it, we fallback onto fixing the headers in the core
361 * virtio-net code.
362 */
363 n->needs_vnet_hdr_swap = virtio_net_set_vnet_endian(vdev, n->nic->ncs,
364 queue_pairs, true);
365 } else if (virtio_net_started(n, vdev->status)) {
366 /* After using the device, we need to reset the network backend to
367 * the default (guest native endianness), otherwise the guest may
368 * lose network connectivity if it is rebooted into a different
369 * endianness.
370 */
371 virtio_net_set_vnet_endian(vdev, n->nic->ncs, queue_pairs, false);
372 }
373 }
374
375 static void virtio_net_drop_tx_queue_data(VirtIODevice *vdev, VirtQueue *vq)
376 {
377 unsigned int dropped = virtqueue_drop_all(vq);
378 if (dropped) {
379 virtio_notify(vdev, vq);
380 }
381 }
382
383 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
384 {
385 VirtIONet *n = VIRTIO_NET(vdev);
386 VirtIONetQueue *q;
387 int i;
388 uint8_t queue_status;
389
390 virtio_net_vnet_endian_status(n, status);
391 virtio_net_vhost_status(n, status);
392
393 for (i = 0; i < n->max_queue_pairs; i++) {
394 NetClientState *ncs = qemu_get_subqueue(n->nic, i);
395 bool queue_started;
396 q = &n->vqs[i];
397
398 if ((!n->multiqueue && i != 0) || i >= n->curr_queue_pairs) {
399 queue_status = 0;
400 } else {
401 queue_status = status;
402 }
403 queue_started =
404 virtio_net_started(n, queue_status) && !n->vhost_started;
405
406 if (queue_started) {
407 qemu_flush_queued_packets(ncs);
408 }
409
410 if (!q->tx_waiting) {
411 continue;
412 }
413
414 if (queue_started) {
415 if (q->tx_timer) {
416 timer_mod(q->tx_timer,
417 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
418 } else {
419 qemu_bh_schedule(q->tx_bh);
420 }
421 } else {
422 if (q->tx_timer) {
423 timer_del(q->tx_timer);
424 } else {
425 qemu_bh_cancel(q->tx_bh);
426 }
427 if ((n->status & VIRTIO_NET_S_LINK_UP) == 0 &&
428 (queue_status & VIRTIO_CONFIG_S_DRIVER_OK) &&
429 vdev->vm_running) {
430 /* if tx is waiting we are likely have some packets in tx queue
431 * and disabled notification */
432 q->tx_waiting = 0;
433 virtio_queue_set_notification(q->tx_vq, 1);
434 virtio_net_drop_tx_queue_data(vdev, q->tx_vq);
435 }
436 }
437 }
438 }
439
440 static void virtio_net_set_link_status(NetClientState *nc)
441 {
442 VirtIONet *n = qemu_get_nic_opaque(nc);
443 VirtIODevice *vdev = VIRTIO_DEVICE(n);
444 uint16_t old_status = n->status;
445
446 if (nc->link_down)
447 n->status &= ~VIRTIO_NET_S_LINK_UP;
448 else
449 n->status |= VIRTIO_NET_S_LINK_UP;
450
451 if (n->status != old_status)
452 virtio_notify_config(vdev);
453
454 virtio_net_set_status(vdev, vdev->status);
455 }
456
457 static void rxfilter_notify(NetClientState *nc)
458 {
459 VirtIONet *n = qemu_get_nic_opaque(nc);
460
461 if (nc->rxfilter_notify_enabled) {
462 char *path = object_get_canonical_path(OBJECT(n->qdev));
463 qapi_event_send_nic_rx_filter_changed(n->netclient_name, path);
464 g_free(path);
465
466 /* disable event notification to avoid events flooding */
467 nc->rxfilter_notify_enabled = 0;
468 }
469 }
470
471 static intList *get_vlan_table(VirtIONet *n)
472 {
473 intList *list;
474 int i, j;
475
476 list = NULL;
477 for (i = 0; i < MAX_VLAN >> 5; i++) {
478 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
479 if (n->vlans[i] & (1U << j)) {
480 QAPI_LIST_PREPEND(list, (i << 5) + j);
481 }
482 }
483 }
484
485 return list;
486 }
487
488 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
489 {
490 VirtIONet *n = qemu_get_nic_opaque(nc);
491 VirtIODevice *vdev = VIRTIO_DEVICE(n);
492 RxFilterInfo *info;
493 strList *str_list;
494 int i;
495
496 info = g_malloc0(sizeof(*info));
497 info->name = g_strdup(nc->name);
498 info->promiscuous = n->promisc;
499
500 if (n->nouni) {
501 info->unicast = RX_STATE_NONE;
502 } else if (n->alluni) {
503 info->unicast = RX_STATE_ALL;
504 } else {
505 info->unicast = RX_STATE_NORMAL;
506 }
507
508 if (n->nomulti) {
509 info->multicast = RX_STATE_NONE;
510 } else if (n->allmulti) {
511 info->multicast = RX_STATE_ALL;
512 } else {
513 info->multicast = RX_STATE_NORMAL;
514 }
515
516 info->broadcast_allowed = n->nobcast;
517 info->multicast_overflow = n->mac_table.multi_overflow;
518 info->unicast_overflow = n->mac_table.uni_overflow;
519
520 info->main_mac = qemu_mac_strdup_printf(n->mac);
521
522 str_list = NULL;
523 for (i = 0; i < n->mac_table.first_multi; i++) {
524 QAPI_LIST_PREPEND(str_list,
525 qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN));
526 }
527 info->unicast_table = str_list;
528
529 str_list = NULL;
530 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
531 QAPI_LIST_PREPEND(str_list,
532 qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN));
533 }
534 info->multicast_table = str_list;
535 info->vlan_table = get_vlan_table(n);
536
537 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
538 info->vlan = RX_STATE_ALL;
539 } else if (!info->vlan_table) {
540 info->vlan = RX_STATE_NONE;
541 } else {
542 info->vlan = RX_STATE_NORMAL;
543 }
544
545 /* enable event notification after query */
546 nc->rxfilter_notify_enabled = 1;
547
548 return info;
549 }
550
551 static void virtio_net_queue_reset(VirtIODevice *vdev, uint32_t queue_index)
552 {
553 VirtIONet *n = VIRTIO_NET(vdev);
554 NetClientState *nc;
555
556 /* validate queue_index and skip for cvq */
557 if (queue_index >= n->max_queue_pairs * 2) {
558 return;
559 }
560
561 nc = qemu_get_subqueue(n->nic, vq2q(queue_index));
562
563 if (!nc->peer) {
564 return;
565 }
566
567 if (get_vhost_net(nc->peer) &&
568 nc->peer->info->type == NET_CLIENT_DRIVER_TAP) {
569 vhost_net_virtqueue_reset(vdev, nc, queue_index);
570 }
571
572 flush_or_purge_queued_packets(nc);
573 }
574
575 static void virtio_net_queue_enable(VirtIODevice *vdev, uint32_t queue_index)
576 {
577 VirtIONet *n = VIRTIO_NET(vdev);
578 NetClientState *nc;
579 int r;
580
581 /* validate queue_index and skip for cvq */
582 if (queue_index >= n->max_queue_pairs * 2) {
583 return;
584 }
585
586 nc = qemu_get_subqueue(n->nic, vq2q(queue_index));
587
588 if (!nc->peer || !vdev->vhost_started) {
589 return;
590 }
591
592 if (get_vhost_net(nc->peer) &&
593 nc->peer->info->type == NET_CLIENT_DRIVER_TAP) {
594 r = vhost_net_virtqueue_restart(vdev, nc, queue_index);
595 if (r < 0) {
596 error_report("unable to restart vhost net virtqueue: %d, "
597 "when resetting the queue", queue_index);
598 }
599 }
600 }
601
602 static void virtio_net_reset(VirtIODevice *vdev)
603 {
604 VirtIONet *n = VIRTIO_NET(vdev);
605 int i;
606
607 /* Reset back to compatibility mode */
608 n->promisc = 1;
609 n->allmulti = 0;
610 n->alluni = 0;
611 n->nomulti = 0;
612 n->nouni = 0;
613 n->nobcast = 0;
614 /* multiqueue is disabled by default */
615 n->curr_queue_pairs = 1;
616 timer_del(n->announce_timer.tm);
617 n->announce_timer.round = 0;
618 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
619
620 /* Flush any MAC and VLAN filter table state */
621 n->mac_table.in_use = 0;
622 n->mac_table.first_multi = 0;
623 n->mac_table.multi_overflow = 0;
624 n->mac_table.uni_overflow = 0;
625 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
626 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
627 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
628 memset(n->vlans, 0, MAX_VLAN >> 3);
629
630 /* Flush any async TX */
631 for (i = 0; i < n->max_queue_pairs; i++) {
632 flush_or_purge_queued_packets(qemu_get_subqueue(n->nic, i));
633 }
634 }
635
636 static void peer_test_vnet_hdr(VirtIONet *n)
637 {
638 NetClientState *nc = qemu_get_queue(n->nic);
639 if (!nc->peer) {
640 return;
641 }
642
643 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
644 }
645
646 static int peer_has_vnet_hdr(VirtIONet *n)
647 {
648 return n->has_vnet_hdr;
649 }
650
651 static int peer_has_ufo(VirtIONet *n)
652 {
653 if (!peer_has_vnet_hdr(n))
654 return 0;
655
656 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
657
658 return n->has_ufo;
659 }
660
661 static int peer_has_uso(VirtIONet *n)
662 {
663 if (!peer_has_vnet_hdr(n)) {
664 return 0;
665 }
666
667 return qemu_has_uso(qemu_get_queue(n->nic)->peer);
668 }
669
670 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
671 int version_1, int hash_report)
672 {
673 int i;
674 NetClientState *nc;
675
676 n->mergeable_rx_bufs = mergeable_rx_bufs;
677
678 /*
679 * Note: when extending the vnet header, please make sure to
680 * change the vnet header copying logic in virtio_net_flush_tx()
681 * as well.
682 */
683 if (version_1) {
684 n->guest_hdr_len = hash_report ?
685 sizeof(struct virtio_net_hdr_v1_hash) :
686 sizeof(struct virtio_net_hdr_mrg_rxbuf);
687 n->rss_data.populate_hash = !!hash_report;
688 } else {
689 n->guest_hdr_len = n->mergeable_rx_bufs ?
690 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
691 sizeof(struct virtio_net_hdr);
692 }
693
694 for (i = 0; i < n->max_queue_pairs; i++) {
695 nc = qemu_get_subqueue(n->nic, i);
696
697 if (peer_has_vnet_hdr(n) &&
698 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
699 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
700 n->host_hdr_len = n->guest_hdr_len;
701 }
702 }
703 }
704
705 static int virtio_net_max_tx_queue_size(VirtIONet *n)
706 {
707 NetClientState *peer = n->nic_conf.peers.ncs[0];
708
709 /*
710 * Backends other than vhost-user or vhost-vdpa don't support max queue
711 * size.
712 */
713 if (!peer) {
714 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
715 }
716
717 switch(peer->info->type) {
718 case NET_CLIENT_DRIVER_VHOST_USER:
719 case NET_CLIENT_DRIVER_VHOST_VDPA:
720 return VIRTQUEUE_MAX_SIZE;
721 default:
722 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE;
723 };
724 }
725
726 static int peer_attach(VirtIONet *n, int index)
727 {
728 NetClientState *nc = qemu_get_subqueue(n->nic, index);
729
730 if (!nc->peer) {
731 return 0;
732 }
733
734 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
735 vhost_set_vring_enable(nc->peer, 1);
736 }
737
738 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
739 return 0;
740 }
741
742 if (n->max_queue_pairs == 1) {
743 return 0;
744 }
745
746 return tap_enable(nc->peer);
747 }
748
749 static int peer_detach(VirtIONet *n, int index)
750 {
751 NetClientState *nc = qemu_get_subqueue(n->nic, index);
752
753 if (!nc->peer) {
754 return 0;
755 }
756
757 if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_USER) {
758 vhost_set_vring_enable(nc->peer, 0);
759 }
760
761 if (nc->peer->info->type != NET_CLIENT_DRIVER_TAP) {
762 return 0;
763 }
764
765 return tap_disable(nc->peer);
766 }
767
768 static void virtio_net_set_queue_pairs(VirtIONet *n)
769 {
770 int i;
771 int r;
772
773 if (n->nic->peer_deleted) {
774 return;
775 }
776
777 for (i = 0; i < n->max_queue_pairs; i++) {
778 if (i < n->curr_queue_pairs) {
779 r = peer_attach(n, i);
780 assert(!r);
781 } else {
782 r = peer_detach(n, i);
783 assert(!r);
784 }
785 }
786 }
787
788 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
789
790 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features,
791 Error **errp)
792 {
793 VirtIONet *n = VIRTIO_NET(vdev);
794 NetClientState *nc = qemu_get_queue(n->nic);
795
796 /* Firstly sync all virtio-net possible supported features */
797 features |= n->host_features;
798
799 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
800
801 if (!peer_has_vnet_hdr(n)) {
802 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
803 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
804 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
805 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
806
807 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
808 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
809 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
810 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
811
812 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_USO);
813 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO4);
814 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO6);
815
816 virtio_clear_feature(&features, VIRTIO_NET_F_HASH_REPORT);
817 }
818
819 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
820 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
821 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
822 }
823
824 if (!peer_has_uso(n)) {
825 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_USO);
826 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO4);
827 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_USO6);
828 }
829
830 if (!get_vhost_net(nc->peer)) {
831 return features;
832 }
833
834 if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
835 virtio_clear_feature(&features, VIRTIO_NET_F_RSS);
836 }
837 features = vhost_net_get_features(get_vhost_net(nc->peer), features);
838 vdev->backend_features = features;
839
840 if (n->mtu_bypass_backend &&
841 (n->host_features & 1ULL << VIRTIO_NET_F_MTU)) {
842 features |= (1ULL << VIRTIO_NET_F_MTU);
843 }
844
845 /*
846 * Since GUEST_ANNOUNCE is emulated the feature bit could be set without
847 * enabled. This happens in the vDPA case.
848 *
849 * Make sure the feature set is not incoherent, as the driver could refuse
850 * to start.
851 *
852 * TODO: QEMU is able to emulate a CVQ just for guest_announce purposes,
853 * helping guest to notify the new location with vDPA devices that does not
854 * support it.
855 */
856 if (!virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_CTRL_VQ)) {
857 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ANNOUNCE);
858 }
859
860 return features;
861 }
862
863 static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
864 {
865 uint64_t features = 0;
866
867 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
868 * but also these: */
869 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
870 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
871 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
872 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
873 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
874
875 return features;
876 }
877
878 static void virtio_net_apply_guest_offloads(VirtIONet *n)
879 {
880 qemu_set_offload(qemu_get_queue(n->nic)->peer,
881 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
882 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
883 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
884 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
885 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)),
886 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_USO4)),
887 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_USO6)));
888 }
889
890 static uint64_t virtio_net_guest_offloads_by_features(uint64_t features)
891 {
892 static const uint64_t guest_offloads_mask =
893 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
894 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
895 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
896 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
897 (1ULL << VIRTIO_NET_F_GUEST_UFO) |
898 (1ULL << VIRTIO_NET_F_GUEST_USO4) |
899 (1ULL << VIRTIO_NET_F_GUEST_USO6);
900
901 return guest_offloads_mask & features;
902 }
903
904 uint64_t virtio_net_supported_guest_offloads(const VirtIONet *n)
905 {
906 VirtIODevice *vdev = VIRTIO_DEVICE(n);
907 return virtio_net_guest_offloads_by_features(vdev->guest_features);
908 }
909
910 typedef struct {
911 VirtIONet *n;
912 DeviceState *dev;
913 } FailoverDevice;
914
915 /**
916 * Set the failover primary device
917 *
918 * @opaque: FailoverId to setup
919 * @opts: opts for device we are handling
920 * @errp: returns an error if this function fails
921 */
922 static int failover_set_primary(DeviceState *dev, void *opaque)
923 {
924 FailoverDevice *fdev = opaque;
925 PCIDevice *pci_dev = (PCIDevice *)
926 object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE);
927
928 if (!pci_dev) {
929 return 0;
930 }
931
932 if (!g_strcmp0(pci_dev->failover_pair_id, fdev->n->netclient_name)) {
933 fdev->dev = dev;
934 return 1;
935 }
936
937 return 0;
938 }
939
940 /**
941 * Find the primary device for this failover virtio-net
942 *
943 * @n: VirtIONet device
944 * @errp: returns an error if this function fails
945 */
946 static DeviceState *failover_find_primary_device(VirtIONet *n)
947 {
948 FailoverDevice fdev = {
949 .n = n,
950 };
951
952 qbus_walk_children(sysbus_get_default(), failover_set_primary, NULL,
953 NULL, NULL, &fdev);
954 return fdev.dev;
955 }
956
957 static void failover_add_primary(VirtIONet *n, Error **errp)
958 {
959 Error *err = NULL;
960 DeviceState *dev = failover_find_primary_device(n);
961
962 if (dev) {
963 return;
964 }
965
966 if (!n->primary_opts) {
967 error_setg(errp, "Primary device not found");
968 error_append_hint(errp, "Virtio-net failover will not work. Make "
969 "sure primary device has parameter"
970 " failover_pair_id=%s\n", n->netclient_name);
971 return;
972 }
973
974 dev = qdev_device_add_from_qdict(n->primary_opts,
975 n->primary_opts_from_json,
976 &err);
977 if (err) {
978 qobject_unref(n->primary_opts);
979 n->primary_opts = NULL;
980 } else {
981 object_unref(OBJECT(dev));
982 }
983 error_propagate(errp, err);
984 }
985
986 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
987 {
988 VirtIONet *n = VIRTIO_NET(vdev);
989 Error *err = NULL;
990 int i;
991
992 if (n->mtu_bypass_backend &&
993 !virtio_has_feature(vdev->backend_features, VIRTIO_NET_F_MTU)) {
994 features &= ~(1ULL << VIRTIO_NET_F_MTU);
995 }
996
997 virtio_net_set_multiqueue(n,
998 virtio_has_feature(features, VIRTIO_NET_F_RSS) ||
999 virtio_has_feature(features, VIRTIO_NET_F_MQ));
1000
1001 virtio_net_set_mrg_rx_bufs(n,
1002 virtio_has_feature(features,
1003 VIRTIO_NET_F_MRG_RXBUF),
1004 virtio_has_feature(features,
1005 VIRTIO_F_VERSION_1),
1006 virtio_has_feature(features,
1007 VIRTIO_NET_F_HASH_REPORT));
1008
1009 n->rsc4_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) &&
1010 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO4);
1011 n->rsc6_enabled = virtio_has_feature(features, VIRTIO_NET_F_RSC_EXT) &&
1012 virtio_has_feature(features, VIRTIO_NET_F_GUEST_TSO6);
1013 n->rss_data.redirect = virtio_has_feature(features, VIRTIO_NET_F_RSS);
1014
1015 if (n->has_vnet_hdr) {
1016 n->curr_guest_offloads =
1017 virtio_net_guest_offloads_by_features(features);
1018 virtio_net_apply_guest_offloads(n);
1019 }
1020
1021 for (i = 0; i < n->max_queue_pairs; i++) {
1022 NetClientState *nc = qemu_get_subqueue(n->nic, i);
1023
1024 if (!get_vhost_net(nc->peer)) {
1025 continue;
1026 }
1027 vhost_net_ack_features(get_vhost_net(nc->peer), features);
1028
1029 /*
1030 * keep acked_features in NetVhostUserState up-to-date so it
1031 * can't miss any features configured by guest virtio driver.
1032 */
1033 vhost_net_save_acked_features(nc->peer);
1034 }
1035
1036 if (!virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
1037 memset(n->vlans, 0xff, MAX_VLAN >> 3);
1038 }
1039
1040 if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) {
1041 qapi_event_send_failover_negotiated(n->netclient_name);
1042 qatomic_set(&n->failover_primary_hidden, false);
1043 failover_add_primary(n, &err);
1044 if (err) {
1045 if (!qtest_enabled()) {
1046 warn_report_err(err);
1047 } else {
1048 error_free(err);
1049 }
1050 }
1051 }
1052 }
1053
1054 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
1055 struct iovec *iov, unsigned int iov_cnt)
1056 {
1057 uint8_t on;
1058 size_t s;
1059 NetClientState *nc = qemu_get_queue(n->nic);
1060
1061 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
1062 if (s != sizeof(on)) {
1063 return VIRTIO_NET_ERR;
1064 }
1065
1066 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
1067 n->promisc = on;
1068 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
1069 n->allmulti = on;
1070 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
1071 n->alluni = on;
1072 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
1073 n->nomulti = on;
1074 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
1075 n->nouni = on;
1076 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
1077 n->nobcast = on;
1078 } else {
1079 return VIRTIO_NET_ERR;
1080 }
1081
1082 rxfilter_notify(nc);
1083
1084 return VIRTIO_NET_OK;
1085 }
1086
1087 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
1088 struct iovec *iov, unsigned int iov_cnt)
1089 {
1090 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1091 uint64_t offloads;
1092 size_t s;
1093
1094 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1095 return VIRTIO_NET_ERR;
1096 }
1097
1098 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
1099 if (s != sizeof(offloads)) {
1100 return VIRTIO_NET_ERR;
1101 }
1102
1103 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
1104 uint64_t supported_offloads;
1105
1106 offloads = virtio_ldq_p(vdev, &offloads);
1107
1108 if (!n->has_vnet_hdr) {
1109 return VIRTIO_NET_ERR;
1110 }
1111
1112 n->rsc4_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) &&
1113 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO4);
1114 n->rsc6_enabled = virtio_has_feature(offloads, VIRTIO_NET_F_RSC_EXT) &&
1115 virtio_has_feature(offloads, VIRTIO_NET_F_GUEST_TSO6);
1116 virtio_clear_feature(&offloads, VIRTIO_NET_F_RSC_EXT);
1117
1118 supported_offloads = virtio_net_supported_guest_offloads(n);
1119 if (offloads & ~supported_offloads) {
1120 return VIRTIO_NET_ERR;
1121 }
1122
1123 n->curr_guest_offloads = offloads;
1124 virtio_net_apply_guest_offloads(n);
1125
1126 return VIRTIO_NET_OK;
1127 } else {
1128 return VIRTIO_NET_ERR;
1129 }
1130 }
1131
1132 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
1133 struct iovec *iov, unsigned int iov_cnt)
1134 {
1135 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1136 struct virtio_net_ctrl_mac mac_data;
1137 size_t s;
1138 NetClientState *nc = qemu_get_queue(n->nic);
1139
1140 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
1141 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
1142 return VIRTIO_NET_ERR;
1143 }
1144 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
1145 assert(s == sizeof(n->mac));
1146 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
1147 rxfilter_notify(nc);
1148
1149 return VIRTIO_NET_OK;
1150 }
1151
1152 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
1153 return VIRTIO_NET_ERR;
1154 }
1155
1156 int in_use = 0;
1157 int first_multi = 0;
1158 uint8_t uni_overflow = 0;
1159 uint8_t multi_overflow = 0;
1160 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1161
1162 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
1163 sizeof(mac_data.entries));
1164 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
1165 if (s != sizeof(mac_data.entries)) {
1166 goto error;
1167 }
1168 iov_discard_front(&iov, &iov_cnt, s);
1169
1170 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
1171 goto error;
1172 }
1173
1174 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
1175 s = iov_to_buf(iov, iov_cnt, 0, macs,
1176 mac_data.entries * ETH_ALEN);
1177 if (s != mac_data.entries * ETH_ALEN) {
1178 goto error;
1179 }
1180 in_use += mac_data.entries;
1181 } else {
1182 uni_overflow = 1;
1183 }
1184
1185 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
1186
1187 first_multi = in_use;
1188
1189 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
1190 sizeof(mac_data.entries));
1191 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
1192 if (s != sizeof(mac_data.entries)) {
1193 goto error;
1194 }
1195
1196 iov_discard_front(&iov, &iov_cnt, s);
1197
1198 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
1199 goto error;
1200 }
1201
1202 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
1203 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
1204 mac_data.entries * ETH_ALEN);
1205 if (s != mac_data.entries * ETH_ALEN) {
1206 goto error;
1207 }
1208 in_use += mac_data.entries;
1209 } else {
1210 multi_overflow = 1;
1211 }
1212
1213 n->mac_table.in_use = in_use;
1214 n->mac_table.first_multi = first_multi;
1215 n->mac_table.uni_overflow = uni_overflow;
1216 n->mac_table.multi_overflow = multi_overflow;
1217 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
1218 g_free(macs);
1219 rxfilter_notify(nc);
1220
1221 return VIRTIO_NET_OK;
1222
1223 error:
1224 g_free(macs);
1225 return VIRTIO_NET_ERR;
1226 }
1227
1228 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
1229 struct iovec *iov, unsigned int iov_cnt)
1230 {
1231 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1232 uint16_t vid;
1233 size_t s;
1234 NetClientState *nc = qemu_get_queue(n->nic);
1235
1236 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
1237 vid = virtio_lduw_p(vdev, &vid);
1238 if (s != sizeof(vid)) {
1239 return VIRTIO_NET_ERR;
1240 }
1241
1242 if (vid >= MAX_VLAN)
1243 return VIRTIO_NET_ERR;
1244
1245 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
1246 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
1247 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
1248 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
1249 else
1250 return VIRTIO_NET_ERR;
1251
1252 rxfilter_notify(nc);
1253
1254 return VIRTIO_NET_OK;
1255 }
1256
1257 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
1258 struct iovec *iov, unsigned int iov_cnt)
1259 {
1260 trace_virtio_net_handle_announce(n->announce_timer.round);
1261 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
1262 n->status & VIRTIO_NET_S_ANNOUNCE) {
1263 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
1264 if (n->announce_timer.round) {
1265 qemu_announce_timer_step(&n->announce_timer);
1266 }
1267 return VIRTIO_NET_OK;
1268 } else {
1269 return VIRTIO_NET_ERR;
1270 }
1271 }
1272
1273 static void virtio_net_detach_epbf_rss(VirtIONet *n);
1274
1275 static void virtio_net_disable_rss(VirtIONet *n)
1276 {
1277 if (n->rss_data.enabled) {
1278 trace_virtio_net_rss_disable();
1279 }
1280 n->rss_data.enabled = false;
1281
1282 virtio_net_detach_epbf_rss(n);
1283 }
1284
1285 static bool virtio_net_attach_ebpf_to_backend(NICState *nic, int prog_fd)
1286 {
1287 NetClientState *nc = qemu_get_peer(qemu_get_queue(nic), 0);
1288 if (nc == NULL || nc->info->set_steering_ebpf == NULL) {
1289 return false;
1290 }
1291
1292 return nc->info->set_steering_ebpf(nc, prog_fd);
1293 }
1294
1295 static void rss_data_to_rss_config(struct VirtioNetRssData *data,
1296 struct EBPFRSSConfig *config)
1297 {
1298 config->redirect = data->redirect;
1299 config->populate_hash = data->populate_hash;
1300 config->hash_types = data->hash_types;
1301 config->indirections_len = data->indirections_len;
1302 config->default_queue = data->default_queue;
1303 }
1304
1305 static bool virtio_net_attach_epbf_rss(VirtIONet *n)
1306 {
1307 struct EBPFRSSConfig config = {};
1308
1309 if (!ebpf_rss_is_loaded(&n->ebpf_rss)) {
1310 return false;
1311 }
1312
1313 rss_data_to_rss_config(&n->rss_data, &config);
1314
1315 if (!ebpf_rss_set_all(&n->ebpf_rss, &config,
1316 n->rss_data.indirections_table, n->rss_data.key)) {
1317 return false;
1318 }
1319
1320 if (!virtio_net_attach_ebpf_to_backend(n->nic, n->ebpf_rss.program_fd)) {
1321 return false;
1322 }
1323
1324 return true;
1325 }
1326
1327 static void virtio_net_detach_epbf_rss(VirtIONet *n)
1328 {
1329 virtio_net_attach_ebpf_to_backend(n->nic, -1);
1330 }
1331
1332 static bool virtio_net_load_ebpf_fds(VirtIONet *n, Error **errp)
1333 {
1334 int fds[EBPF_RSS_MAX_FDS] = { [0 ... EBPF_RSS_MAX_FDS - 1] = -1};
1335 int ret = true;
1336 int i = 0;
1337
1338 ERRP_GUARD();
1339
1340 if (n->nr_ebpf_rss_fds != EBPF_RSS_MAX_FDS) {
1341 error_setg(errp,
1342 "Expected %d file descriptors but got %d",
1343 EBPF_RSS_MAX_FDS, n->nr_ebpf_rss_fds);
1344 return false;
1345 }
1346
1347 for (i = 0; i < n->nr_ebpf_rss_fds; i++) {
1348 fds[i] = monitor_fd_param(monitor_cur(), n->ebpf_rss_fds[i], errp);
1349 if (*errp) {
1350 ret = false;
1351 goto exit;
1352 }
1353 }
1354
1355 ret = ebpf_rss_load_fds(&n->ebpf_rss, fds[0], fds[1], fds[2], fds[3]);
1356
1357 exit:
1358 if (!ret || *errp) {
1359 for (i = 0; i < n->nr_ebpf_rss_fds && fds[i] != -1; i++) {
1360 close(fds[i]);
1361 }
1362 }
1363
1364 return ret;
1365 }
1366
1367 static bool virtio_net_load_ebpf(VirtIONet *n, Error **errp)
1368 {
1369 bool ret = false;
1370
1371 if (virtio_net_attach_ebpf_to_backend(n->nic, -1)) {
1372 if (!(n->ebpf_rss_fds
1373 && virtio_net_load_ebpf_fds(n, errp))) {
1374 ret = ebpf_rss_load(&n->ebpf_rss);
1375 }
1376 }
1377
1378 return ret;
1379 }
1380
1381 static void virtio_net_unload_ebpf(VirtIONet *n)
1382 {
1383 virtio_net_attach_ebpf_to_backend(n->nic, -1);
1384 ebpf_rss_unload(&n->ebpf_rss);
1385 }
1386
1387 static uint16_t virtio_net_handle_rss(VirtIONet *n,
1388 struct iovec *iov,
1389 unsigned int iov_cnt,
1390 bool do_rss)
1391 {
1392 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1393 struct virtio_net_rss_config cfg;
1394 size_t s, offset = 0, size_get;
1395 uint16_t queue_pairs, i;
1396 struct {
1397 uint16_t us;
1398 uint8_t b;
1399 } QEMU_PACKED temp;
1400 const char *err_msg = "";
1401 uint32_t err_value = 0;
1402
1403 if (do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_RSS)) {
1404 err_msg = "RSS is not negotiated";
1405 goto error;
1406 }
1407 if (!do_rss && !virtio_vdev_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) {
1408 err_msg = "Hash report is not negotiated";
1409 goto error;
1410 }
1411 size_get = offsetof(struct virtio_net_rss_config, indirection_table);
1412 s = iov_to_buf(iov, iov_cnt, offset, &cfg, size_get);
1413 if (s != size_get) {
1414 err_msg = "Short command buffer";
1415 err_value = (uint32_t)s;
1416 goto error;
1417 }
1418 n->rss_data.hash_types = virtio_ldl_p(vdev, &cfg.hash_types);
1419 n->rss_data.indirections_len =
1420 virtio_lduw_p(vdev, &cfg.indirection_table_mask);
1421 n->rss_data.indirections_len++;
1422 if (!do_rss) {
1423 n->rss_data.indirections_len = 1;
1424 }
1425 if (!is_power_of_2(n->rss_data.indirections_len)) {
1426 err_msg = "Invalid size of indirection table";
1427 err_value = n->rss_data.indirections_len;
1428 goto error;
1429 }
1430 if (n->rss_data.indirections_len > VIRTIO_NET_RSS_MAX_TABLE_LEN) {
1431 err_msg = "Too large indirection table";
1432 err_value = n->rss_data.indirections_len;
1433 goto error;
1434 }
1435 n->rss_data.default_queue = do_rss ?
1436 virtio_lduw_p(vdev, &cfg.unclassified_queue) : 0;
1437 if (n->rss_data.default_queue >= n->max_queue_pairs) {
1438 err_msg = "Invalid default queue";
1439 err_value = n->rss_data.default_queue;
1440 goto error;
1441 }
1442 offset += size_get;
1443 size_get = sizeof(uint16_t) * n->rss_data.indirections_len;
1444 g_free(n->rss_data.indirections_table);
1445 n->rss_data.indirections_table = g_malloc(size_get);
1446 if (!n->rss_data.indirections_table) {
1447 err_msg = "Can't allocate indirections table";
1448 err_value = n->rss_data.indirections_len;
1449 goto error;
1450 }
1451 s = iov_to_buf(iov, iov_cnt, offset,
1452 n->rss_data.indirections_table, size_get);
1453 if (s != size_get) {
1454 err_msg = "Short indirection table buffer";
1455 err_value = (uint32_t)s;
1456 goto error;
1457 }
1458 for (i = 0; i < n->rss_data.indirections_len; ++i) {
1459 uint16_t val = n->rss_data.indirections_table[i];
1460 n->rss_data.indirections_table[i] = virtio_lduw_p(vdev, &val);
1461 }
1462 offset += size_get;
1463 size_get = sizeof(temp);
1464 s = iov_to_buf(iov, iov_cnt, offset, &temp, size_get);
1465 if (s != size_get) {
1466 err_msg = "Can't get queue_pairs";
1467 err_value = (uint32_t)s;
1468 goto error;
1469 }
1470 queue_pairs = do_rss ? virtio_lduw_p(vdev, &temp.us) : n->curr_queue_pairs;
1471 if (queue_pairs == 0 || queue_pairs > n->max_queue_pairs) {
1472 err_msg = "Invalid number of queue_pairs";
1473 err_value = queue_pairs;
1474 goto error;
1475 }
1476 if (temp.b > VIRTIO_NET_RSS_MAX_KEY_SIZE) {
1477 err_msg = "Invalid key size";
1478 err_value = temp.b;
1479 goto error;
1480 }
1481 if (!temp.b && n->rss_data.hash_types) {
1482 err_msg = "No key provided";
1483 err_value = 0;
1484 goto error;
1485 }
1486 if (!temp.b && !n->rss_data.hash_types) {
1487 virtio_net_disable_rss(n);
1488 return queue_pairs;
1489 }
1490 offset += size_get;
1491 size_get = temp.b;
1492 s = iov_to_buf(iov, iov_cnt, offset, n->rss_data.key, size_get);
1493 if (s != size_get) {
1494 err_msg = "Can get key buffer";
1495 err_value = (uint32_t)s;
1496 goto error;
1497 }
1498 n->rss_data.enabled = true;
1499
1500 if (!n->rss_data.populate_hash) {
1501 if (!virtio_net_attach_epbf_rss(n)) {
1502 /* EBPF must be loaded for vhost */
1503 if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
1504 warn_report("Can't load eBPF RSS for vhost");
1505 goto error;
1506 }
1507 /* fallback to software RSS */
1508 warn_report("Can't load eBPF RSS - fallback to software RSS");
1509 n->rss_data.enabled_software_rss = true;
1510 }
1511 } else {
1512 /* use software RSS for hash populating */
1513 /* and detach eBPF if was loaded before */
1514 virtio_net_detach_epbf_rss(n);
1515 n->rss_data.enabled_software_rss = true;
1516 }
1517
1518 trace_virtio_net_rss_enable(n->rss_data.hash_types,
1519 n->rss_data.indirections_len,
1520 temp.b);
1521 return queue_pairs;
1522 error:
1523 trace_virtio_net_rss_error(err_msg, err_value);
1524 virtio_net_disable_rss(n);
1525 return 0;
1526 }
1527
1528 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
1529 struct iovec *iov, unsigned int iov_cnt)
1530 {
1531 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1532 uint16_t queue_pairs;
1533 NetClientState *nc = qemu_get_queue(n->nic);
1534
1535 virtio_net_disable_rss(n);
1536 if (cmd == VIRTIO_NET_CTRL_MQ_HASH_CONFIG) {
1537 queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, false);
1538 return queue_pairs ? VIRTIO_NET_OK : VIRTIO_NET_ERR;
1539 }
1540 if (cmd == VIRTIO_NET_CTRL_MQ_RSS_CONFIG) {
1541 queue_pairs = virtio_net_handle_rss(n, iov, iov_cnt, true);
1542 } else if (cmd == VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
1543 struct virtio_net_ctrl_mq mq;
1544 size_t s;
1545 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ)) {
1546 return VIRTIO_NET_ERR;
1547 }
1548 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
1549 if (s != sizeof(mq)) {
1550 return VIRTIO_NET_ERR;
1551 }
1552 queue_pairs = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
1553
1554 } else {
1555 return VIRTIO_NET_ERR;
1556 }
1557
1558 if (queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
1559 queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
1560 queue_pairs > n->max_queue_pairs ||
1561 !n->multiqueue) {
1562 return VIRTIO_NET_ERR;
1563 }
1564
1565 n->curr_queue_pairs = queue_pairs;
1566 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
1567 /*
1568 * Avoid updating the backend for a vdpa device: We're only interested
1569 * in updating the device model queues.
1570 */
1571 return VIRTIO_NET_OK;
1572 }
1573 /* stop the backend before changing the number of queue_pairs to avoid handling a
1574 * disabled queue */
1575 virtio_net_set_status(vdev, vdev->status);
1576 virtio_net_set_queue_pairs(n);
1577
1578 return VIRTIO_NET_OK;
1579 }
1580
1581 size_t virtio_net_handle_ctrl_iov(VirtIODevice *vdev,
1582 const struct iovec *in_sg, unsigned in_num,
1583 const struct iovec *out_sg,
1584 unsigned out_num)
1585 {
1586 VirtIONet *n = VIRTIO_NET(vdev);
1587 struct virtio_net_ctrl_hdr ctrl;
1588 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
1589 size_t s;
1590 struct iovec *iov, *iov2;
1591
1592 if (iov_size(in_sg, in_num) < sizeof(status) ||
1593 iov_size(out_sg, out_num) < sizeof(ctrl)) {
1594 virtio_error(vdev, "virtio-net ctrl missing headers");
1595 return 0;
1596 }
1597
1598 iov2 = iov = g_memdup2(out_sg, sizeof(struct iovec) * out_num);
1599 s = iov_to_buf(iov, out_num, 0, &ctrl, sizeof(ctrl));
1600 iov_discard_front(&iov, &out_num, sizeof(ctrl));
1601 if (s != sizeof(ctrl)) {
1602 status = VIRTIO_NET_ERR;
1603 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
1604 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, out_num);
1605 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
1606 status = virtio_net_handle_mac(n, ctrl.cmd, iov, out_num);
1607 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
1608 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, out_num);
1609 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
1610 status = virtio_net_handle_announce(n, ctrl.cmd, iov, out_num);
1611 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
1612 status = virtio_net_handle_mq(n, ctrl.cmd, iov, out_num);
1613 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
1614 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, out_num);
1615 }
1616
1617 s = iov_from_buf(in_sg, in_num, 0, &status, sizeof(status));
1618 assert(s == sizeof(status));
1619
1620 g_free(iov2);
1621 return sizeof(status);
1622 }
1623
1624 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
1625 {
1626 VirtQueueElement *elem;
1627
1628 for (;;) {
1629 size_t written;
1630 elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
1631 if (!elem) {
1632 break;
1633 }
1634
1635 written = virtio_net_handle_ctrl_iov(vdev, elem->in_sg, elem->in_num,
1636 elem->out_sg, elem->out_num);
1637 if (written > 0) {
1638 virtqueue_push(vq, elem, written);
1639 virtio_notify(vdev, vq);
1640 g_free(elem);
1641 } else {
1642 virtqueue_detach_element(vq, elem, 0);
1643 g_free(elem);
1644 break;
1645 }
1646 }
1647 }
1648
1649 /* RX */
1650
1651 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
1652 {
1653 VirtIONet *n = VIRTIO_NET(vdev);
1654 int queue_index = vq2q(virtio_get_queue_index(vq));
1655
1656 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
1657 }
1658
1659 static bool virtio_net_can_receive(NetClientState *nc)
1660 {
1661 VirtIONet *n = qemu_get_nic_opaque(nc);
1662 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1663 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1664
1665 if (!vdev->vm_running) {
1666 return false;
1667 }
1668
1669 if (nc->queue_index >= n->curr_queue_pairs) {
1670 return false;
1671 }
1672
1673 if (!virtio_queue_ready(q->rx_vq) ||
1674 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1675 return false;
1676 }
1677
1678 return true;
1679 }
1680
1681 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
1682 {
1683 VirtIONet *n = q->n;
1684 if (virtio_queue_empty(q->rx_vq) ||
1685 (n->mergeable_rx_bufs &&
1686 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1687 virtio_queue_set_notification(q->rx_vq, 1);
1688
1689 /* To avoid a race condition where the guest has made some buffers
1690 * available after the above check but before notification was
1691 * enabled, check for available buffers again.
1692 */
1693 if (virtio_queue_empty(q->rx_vq) ||
1694 (n->mergeable_rx_bufs &&
1695 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
1696 return 0;
1697 }
1698 }
1699
1700 virtio_queue_set_notification(q->rx_vq, 0);
1701 return 1;
1702 }
1703
1704 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
1705 {
1706 virtio_tswap16s(vdev, &hdr->hdr_len);
1707 virtio_tswap16s(vdev, &hdr->gso_size);
1708 virtio_tswap16s(vdev, &hdr->csum_start);
1709 virtio_tswap16s(vdev, &hdr->csum_offset);
1710 }
1711
1712 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
1713 * it never finds out that the packets don't have valid checksums. This
1714 * causes dhclient to get upset. Fedora's carried a patch for ages to
1715 * fix this with Xen but it hasn't appeared in an upstream release of
1716 * dhclient yet.
1717 *
1718 * To avoid breaking existing guests, we catch udp packets and add
1719 * checksums. This is terrible but it's better than hacking the guest
1720 * kernels.
1721 *
1722 * N.B. if we introduce a zero-copy API, this operation is no longer free so
1723 * we should provide a mechanism to disable it to avoid polluting the host
1724 * cache.
1725 */
1726 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
1727 uint8_t *buf, size_t size)
1728 {
1729 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
1730 (size > 27 && size < 1500) && /* normal sized MTU */
1731 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
1732 (buf[23] == 17) && /* ip.protocol == UDP */
1733 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
1734 net_checksum_calculate(buf, size, CSUM_UDP);
1735 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
1736 }
1737 }
1738
1739 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
1740 const void *buf, size_t size)
1741 {
1742 if (n->has_vnet_hdr) {
1743 /* FIXME this cast is evil */
1744 void *wbuf = (void *)buf;
1745 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
1746 size - n->host_hdr_len);
1747
1748 if (n->needs_vnet_hdr_swap) {
1749 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
1750 }
1751 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
1752 } else {
1753 struct virtio_net_hdr hdr = {
1754 .flags = 0,
1755 .gso_type = VIRTIO_NET_HDR_GSO_NONE
1756 };
1757 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
1758 }
1759 }
1760
1761 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
1762 {
1763 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1764 static const uint8_t vlan[] = {0x81, 0x00};
1765 uint8_t *ptr = (uint8_t *)buf;
1766 int i;
1767
1768 if (n->promisc)
1769 return 1;
1770
1771 ptr += n->host_hdr_len;
1772
1773 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
1774 int vid = lduw_be_p(ptr + 14) & 0xfff;
1775 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
1776 return 0;
1777 }
1778
1779 if (ptr[0] & 1) { // multicast
1780 if (!memcmp(ptr, bcast, sizeof(bcast))) {
1781 return !n->nobcast;
1782 } else if (n->nomulti) {
1783 return 0;
1784 } else if (n->allmulti || n->mac_table.multi_overflow) {
1785 return 1;
1786 }
1787
1788 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
1789 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1790 return 1;
1791 }
1792 }
1793 } else { // unicast
1794 if (n->nouni) {
1795 return 0;
1796 } else if (n->alluni || n->mac_table.uni_overflow) {
1797 return 1;
1798 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
1799 return 1;
1800 }
1801
1802 for (i = 0; i < n->mac_table.first_multi; i++) {
1803 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1804 return 1;
1805 }
1806 }
1807 }
1808
1809 return 0;
1810 }
1811
1812 static uint8_t virtio_net_get_hash_type(bool hasip4,
1813 bool hasip6,
1814 EthL4HdrProto l4hdr_proto,
1815 uint32_t types)
1816 {
1817 if (hasip4) {
1818 switch (l4hdr_proto) {
1819 case ETH_L4_HDR_PROTO_TCP:
1820 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) {
1821 return NetPktRssIpV4Tcp;
1822 }
1823 break;
1824
1825 case ETH_L4_HDR_PROTO_UDP:
1826 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) {
1827 return NetPktRssIpV4Udp;
1828 }
1829 break;
1830
1831 default:
1832 break;
1833 }
1834
1835 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv4) {
1836 return NetPktRssIpV4;
1837 }
1838 } else if (hasip6) {
1839 switch (l4hdr_proto) {
1840 case ETH_L4_HDR_PROTO_TCP:
1841 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCP_EX) {
1842 return NetPktRssIpV6TcpEx;
1843 }
1844 if (types & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) {
1845 return NetPktRssIpV6Tcp;
1846 }
1847 break;
1848
1849 case ETH_L4_HDR_PROTO_UDP:
1850 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDP_EX) {
1851 return NetPktRssIpV6UdpEx;
1852 }
1853 if (types & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) {
1854 return NetPktRssIpV6Udp;
1855 }
1856 break;
1857
1858 default:
1859 break;
1860 }
1861
1862 if (types & VIRTIO_NET_RSS_HASH_TYPE_IP_EX) {
1863 return NetPktRssIpV6Ex;
1864 }
1865 if (types & VIRTIO_NET_RSS_HASH_TYPE_IPv6) {
1866 return NetPktRssIpV6;
1867 }
1868 }
1869 return 0xff;
1870 }
1871
1872 static void virtio_set_packet_hash(const uint8_t *buf, uint8_t report,
1873 uint32_t hash)
1874 {
1875 struct virtio_net_hdr_v1_hash *hdr = (void *)buf;
1876 hdr->hash_value = hash;
1877 hdr->hash_report = report;
1878 }
1879
1880 static int virtio_net_process_rss(NetClientState *nc, const uint8_t *buf,
1881 size_t size)
1882 {
1883 VirtIONet *n = qemu_get_nic_opaque(nc);
1884 unsigned int index = nc->queue_index, new_index = index;
1885 struct NetRxPkt *pkt = n->rx_pkt;
1886 uint8_t net_hash_type;
1887 uint32_t hash;
1888 bool hasip4, hasip6;
1889 EthL4HdrProto l4hdr_proto;
1890 static const uint8_t reports[NetPktRssIpV6UdpEx + 1] = {
1891 VIRTIO_NET_HASH_REPORT_IPv4,
1892 VIRTIO_NET_HASH_REPORT_TCPv4,
1893 VIRTIO_NET_HASH_REPORT_TCPv6,
1894 VIRTIO_NET_HASH_REPORT_IPv6,
1895 VIRTIO_NET_HASH_REPORT_IPv6_EX,
1896 VIRTIO_NET_HASH_REPORT_TCPv6_EX,
1897 VIRTIO_NET_HASH_REPORT_UDPv4,
1898 VIRTIO_NET_HASH_REPORT_UDPv6,
1899 VIRTIO_NET_HASH_REPORT_UDPv6_EX
1900 };
1901 struct iovec iov = {
1902 .iov_base = (void *)buf,
1903 .iov_len = size
1904 };
1905
1906 net_rx_pkt_set_protocols(pkt, &iov, 1, n->host_hdr_len);
1907 net_rx_pkt_get_protocols(pkt, &hasip4, &hasip6, &l4hdr_proto);
1908 net_hash_type = virtio_net_get_hash_type(hasip4, hasip6, l4hdr_proto,
1909 n->rss_data.hash_types);
1910 if (net_hash_type > NetPktRssIpV6UdpEx) {
1911 if (n->rss_data.populate_hash) {
1912 virtio_set_packet_hash(buf, VIRTIO_NET_HASH_REPORT_NONE, 0);
1913 }
1914 return n->rss_data.redirect ? n->rss_data.default_queue : -1;
1915 }
1916
1917 hash = net_rx_pkt_calc_rss_hash(pkt, net_hash_type, n->rss_data.key);
1918
1919 if (n->rss_data.populate_hash) {
1920 virtio_set_packet_hash(buf, reports[net_hash_type], hash);
1921 }
1922
1923 if (n->rss_data.redirect) {
1924 new_index = hash & (n->rss_data.indirections_len - 1);
1925 new_index = n->rss_data.indirections_table[new_index];
1926 }
1927
1928 return (index == new_index) ? -1 : new_index;
1929 }
1930
1931 static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf,
1932 size_t size, bool no_rss)
1933 {
1934 VirtIONet *n = qemu_get_nic_opaque(nc);
1935 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1936 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1937 VirtQueueElement *elems[VIRTQUEUE_MAX_SIZE];
1938 size_t lens[VIRTQUEUE_MAX_SIZE];
1939 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1940 struct virtio_net_hdr_mrg_rxbuf mhdr;
1941 unsigned mhdr_cnt = 0;
1942 size_t offset, i, guest_offset, j;
1943 ssize_t err;
1944
1945 if (!virtio_net_can_receive(nc)) {
1946 return -1;
1947 }
1948
1949 if (!no_rss && n->rss_data.enabled && n->rss_data.enabled_software_rss) {
1950 int index = virtio_net_process_rss(nc, buf, size);
1951 if (index >= 0) {
1952 NetClientState *nc2 = qemu_get_subqueue(n->nic, index);
1953 return virtio_net_receive_rcu(nc2, buf, size, true);
1954 }
1955 }
1956
1957 /* hdr_len refers to the header we supply to the guest */
1958 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1959 return 0;
1960 }
1961
1962 if (!receive_filter(n, buf, size))
1963 return size;
1964
1965 offset = i = 0;
1966
1967 while (offset < size) {
1968 VirtQueueElement *elem;
1969 int len, total;
1970 const struct iovec *sg;
1971
1972 total = 0;
1973
1974 if (i == VIRTQUEUE_MAX_SIZE) {
1975 virtio_error(vdev, "virtio-net unexpected long buffer chain");
1976 err = size;
1977 goto err;
1978 }
1979
1980 elem = virtqueue_pop(q->rx_vq, sizeof(VirtQueueElement));
1981 if (!elem) {
1982 if (i) {
1983 virtio_error(vdev, "virtio-net unexpected empty queue: "
1984 "i %zd mergeable %d offset %zd, size %zd, "
1985 "guest hdr len %zd, host hdr len %zd "
1986 "guest features 0x%" PRIx64,
1987 i, n->mergeable_rx_bufs, offset, size,
1988 n->guest_hdr_len, n->host_hdr_len,
1989 vdev->guest_features);
1990 }
1991 err = -1;
1992 goto err;
1993 }
1994
1995 if (elem->in_num < 1) {
1996 virtio_error(vdev,
1997 "virtio-net receive queue contains no in buffers");
1998 virtqueue_detach_element(q->rx_vq, elem, 0);
1999 g_free(elem);
2000 err = -1;
2001 goto err;
2002 }
2003
2004 sg = elem->in_sg;
2005 if (i == 0) {
2006 assert(offset == 0);
2007 if (n->mergeable_rx_bufs) {
2008 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
2009 sg, elem->in_num,
2010 offsetof(typeof(mhdr), num_buffers),
2011 sizeof(mhdr.num_buffers));
2012 }
2013
2014 receive_header(n, sg, elem->in_num, buf, size);
2015 if (n->rss_data.populate_hash) {
2016 offset = sizeof(mhdr);
2017 iov_from_buf(sg, elem->in_num, offset,
2018 buf + offset, n->host_hdr_len - sizeof(mhdr));
2019 }
2020 offset = n->host_hdr_len;
2021 total += n->guest_hdr_len;
2022 guest_offset = n->guest_hdr_len;
2023 } else {
2024 guest_offset = 0;
2025 }
2026
2027 /* copy in packet. ugh */
2028 len = iov_from_buf(sg, elem->in_num, guest_offset,
2029 buf + offset, size - offset);
2030 total += len;
2031 offset += len;
2032 /* If buffers can't be merged, at this point we
2033 * must have consumed the complete packet.
2034 * Otherwise, drop it. */
2035 if (!n->mergeable_rx_bufs && offset < size) {
2036 virtqueue_unpop(q->rx_vq, elem, total);
2037 g_free(elem);
2038 err = size;
2039 goto err;
2040 }
2041
2042 /* Mark dirty page's bitmap of guest memory */
2043 if (vdev->lm_logging_ctrl == LM_ENABLE) {
2044 uint64_t chunk = elem->in_addr[i] / VHOST_LOG_CHUNK;
2045 /* Get chunk index */
2046 BitmapMemoryRegionCaches *caches = qatomic_rcu_read(&vdev->caches);
2047 uint64_t index = chunk / 8;
2048 uint64_t shift = chunk % 8;
2049 uint8_t val = 0;
2050 address_space_read_cached(&caches->bitmap, index, &val,
2051 sizeof(val));
2052 val |= 1 << shift;
2053 address_space_write_cached(&caches->bitmap, index, &val,
2054 sizeof(val));
2055 address_space_cache_invalidate(&caches->bitmap, index, sizeof(val));
2056 }
2057
2058 elems[i] = elem;
2059 lens[i] = total;
2060 i++;
2061 }
2062
2063 if (mhdr_cnt) {
2064 virtio_stw_p(vdev, &mhdr.num_buffers, i);
2065 iov_from_buf(mhdr_sg, mhdr_cnt,
2066 0,
2067 &mhdr.num_buffers, sizeof mhdr.num_buffers);
2068 }
2069
2070 for (j = 0; j < i; j++) {
2071 /* signal other side */
2072 virtqueue_fill(q->rx_vq, elems[j], lens[j], j);
2073 g_free(elems[j]);
2074 }
2075
2076 virtqueue_flush(q->rx_vq, i);
2077 virtio_notify(vdev, q->rx_vq);
2078
2079 return size;
2080
2081 err:
2082 for (j = 0; j < i; j++) {
2083 virtqueue_detach_element(q->rx_vq, elems[j], lens[j]);
2084 g_free(elems[j]);
2085 }
2086
2087 return err;
2088 }
2089
2090 static ssize_t virtio_net_do_receive(NetClientState *nc, const uint8_t *buf,
2091 size_t size)
2092 {
2093 RCU_READ_LOCK_GUARD();
2094
2095 return virtio_net_receive_rcu(nc, buf, size, false);
2096 }
2097
2098 static void virtio_net_rsc_extract_unit4(VirtioNetRscChain *chain,
2099 const uint8_t *buf,
2100 VirtioNetRscUnit *unit)
2101 {
2102 uint16_t ip_hdrlen;
2103 struct ip_header *ip;
2104
2105 ip = (struct ip_header *)(buf + chain->n->guest_hdr_len
2106 + sizeof(struct eth_header));
2107 unit->ip = (void *)ip;
2108 ip_hdrlen = (ip->ip_ver_len & 0xF) << 2;
2109 unit->ip_plen = &ip->ip_len;
2110 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip) + ip_hdrlen);
2111 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10;
2112 unit->payload = htons(*unit->ip_plen) - ip_hdrlen - unit->tcp_hdrlen;
2113 }
2114
2115 static void virtio_net_rsc_extract_unit6(VirtioNetRscChain *chain,
2116 const uint8_t *buf,
2117 VirtioNetRscUnit *unit)
2118 {
2119 struct ip6_header *ip6;
2120
2121 ip6 = (struct ip6_header *)(buf + chain->n->guest_hdr_len
2122 + sizeof(struct eth_header));
2123 unit->ip = ip6;
2124 unit->ip_plen = &(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
2125 unit->tcp = (struct tcp_header *)(((uint8_t *)unit->ip)
2126 + sizeof(struct ip6_header));
2127 unit->tcp_hdrlen = (htons(unit->tcp->th_offset_flags) & 0xF000) >> 10;
2128
2129 /* There is a difference between payload length in ipv4 and v6,
2130 ip header is excluded in ipv6 */
2131 unit->payload = htons(*unit->ip_plen) - unit->tcp_hdrlen;
2132 }
2133
2134 static size_t virtio_net_rsc_drain_seg(VirtioNetRscChain *chain,
2135 VirtioNetRscSeg *seg)
2136 {
2137 int ret;
2138 struct virtio_net_hdr_v1 *h;
2139
2140 h = (struct virtio_net_hdr_v1 *)seg->buf;
2141 h->flags = 0;
2142 h->gso_type = VIRTIO_NET_HDR_GSO_NONE;
2143
2144 if (seg->is_coalesced) {
2145 h->rsc.segments = seg->packets;
2146 h->rsc.dup_acks = seg->dup_ack;
2147 h->flags = VIRTIO_NET_HDR_F_RSC_INFO;
2148 if (chain->proto == ETH_P_IP) {
2149 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2150 } else {
2151 h->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2152 }
2153 }
2154
2155 ret = virtio_net_do_receive(seg->nc, seg->buf, seg->size);
2156 QTAILQ_REMOVE(&chain->buffers, seg, next);
2157 g_free(seg->buf);
2158 g_free(seg);
2159
2160 return ret;
2161 }
2162
2163 static void virtio_net_rsc_purge(void *opq)
2164 {
2165 VirtioNetRscSeg *seg, *rn;
2166 VirtioNetRscChain *chain = (VirtioNetRscChain *)opq;
2167
2168 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn) {
2169 if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
2170 chain->stat.purge_failed++;
2171 continue;
2172 }
2173 }
2174
2175 chain->stat.timer++;
2176 if (!QTAILQ_EMPTY(&chain->buffers)) {
2177 timer_mod(chain->drain_timer,
2178 qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout);
2179 }
2180 }
2181
2182 static void virtio_net_rsc_cleanup(VirtIONet *n)
2183 {
2184 VirtioNetRscChain *chain, *rn_chain;
2185 VirtioNetRscSeg *seg, *rn_seg;
2186
2187 QTAILQ_FOREACH_SAFE(chain, &n->rsc_chains, next, rn_chain) {
2188 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, rn_seg) {
2189 QTAILQ_REMOVE(&chain->buffers, seg, next);
2190 g_free(seg->buf);
2191 g_free(seg);
2192 }
2193
2194 timer_free(chain->drain_timer);
2195 QTAILQ_REMOVE(&n->rsc_chains, chain, next);
2196 g_free(chain);
2197 }
2198 }
2199
2200 static void virtio_net_rsc_cache_buf(VirtioNetRscChain *chain,
2201 NetClientState *nc,
2202 const uint8_t *buf, size_t size)
2203 {
2204 uint16_t hdr_len;
2205 VirtioNetRscSeg *seg;
2206
2207 hdr_len = chain->n->guest_hdr_len;
2208 seg = g_new(VirtioNetRscSeg, 1);
2209 seg->buf = g_malloc(hdr_len + sizeof(struct eth_header)
2210 + sizeof(struct ip6_header) + VIRTIO_NET_MAX_TCP_PAYLOAD);
2211 memcpy(seg->buf, buf, size);
2212 seg->size = size;
2213 seg->packets = 1;
2214 seg->dup_ack = 0;
2215 seg->is_coalesced = 0;
2216 seg->nc = nc;
2217
2218 QTAILQ_INSERT_TAIL(&chain->buffers, seg, next);
2219 chain->stat.cache++;
2220
2221 switch (chain->proto) {
2222 case ETH_P_IP:
2223 virtio_net_rsc_extract_unit4(chain, seg->buf, &seg->unit);
2224 break;
2225 case ETH_P_IPV6:
2226 virtio_net_rsc_extract_unit6(chain, seg->buf, &seg->unit);
2227 break;
2228 default:
2229 g_assert_not_reached();
2230 }
2231 }
2232
2233 static int32_t virtio_net_rsc_handle_ack(VirtioNetRscChain *chain,
2234 VirtioNetRscSeg *seg,
2235 const uint8_t *buf,
2236 struct tcp_header *n_tcp,
2237 struct tcp_header *o_tcp)
2238 {
2239 uint32_t nack, oack;
2240 uint16_t nwin, owin;
2241
2242 nack = htonl(n_tcp->th_ack);
2243 nwin = htons(n_tcp->th_win);
2244 oack = htonl(o_tcp->th_ack);
2245 owin = htons(o_tcp->th_win);
2246
2247 if ((nack - oack) >= VIRTIO_NET_MAX_TCP_PAYLOAD) {
2248 chain->stat.ack_out_of_win++;
2249 return RSC_FINAL;
2250 } else if (nack == oack) {
2251 /* duplicated ack or window probe */
2252 if (nwin == owin) {
2253 /* duplicated ack, add dup ack count due to whql test up to 1 */
2254 chain->stat.dup_ack++;
2255 return RSC_FINAL;
2256 } else {
2257 /* Coalesce window update */
2258 o_tcp->th_win = n_tcp->th_win;
2259 chain->stat.win_update++;
2260 return RSC_COALESCE;
2261 }
2262 } else {
2263 /* pure ack, go to 'C', finalize*/
2264 chain->stat.pure_ack++;
2265 return RSC_FINAL;
2266 }
2267 }
2268
2269 static int32_t virtio_net_rsc_coalesce_data(VirtioNetRscChain *chain,
2270 VirtioNetRscSeg *seg,
2271 const uint8_t *buf,
2272 VirtioNetRscUnit *n_unit)
2273 {
2274 void *data;
2275 uint16_t o_ip_len;
2276 uint32_t nseq, oseq;
2277 VirtioNetRscUnit *o_unit;
2278
2279 o_unit = &seg->unit;
2280 o_ip_len = htons(*o_unit->ip_plen);
2281 nseq = htonl(n_unit->tcp->th_seq);
2282 oseq = htonl(o_unit->tcp->th_seq);
2283
2284 /* out of order or retransmitted. */
2285 if ((nseq - oseq) > VIRTIO_NET_MAX_TCP_PAYLOAD) {
2286 chain->stat.data_out_of_win++;
2287 return RSC_FINAL;
2288 }
2289
2290 data = ((uint8_t *)n_unit->tcp) + n_unit->tcp_hdrlen;
2291 if (nseq == oseq) {
2292 if ((o_unit->payload == 0) && n_unit->payload) {
2293 /* From no payload to payload, normal case, not a dup ack or etc */
2294 chain->stat.data_after_pure_ack++;
2295 goto coalesce;
2296 } else {
2297 return virtio_net_rsc_handle_ack(chain, seg, buf,
2298 n_unit->tcp, o_unit->tcp);
2299 }
2300 } else if ((nseq - oseq) != o_unit->payload) {
2301 /* Not a consistent packet, out of order */
2302 chain->stat.data_out_of_order++;
2303 return RSC_FINAL;
2304 } else {
2305 coalesce:
2306 if ((o_ip_len + n_unit->payload) > chain->max_payload) {
2307 chain->stat.over_size++;
2308 return RSC_FINAL;
2309 }
2310
2311 /* Here comes the right data, the payload length in v4/v6 is different,
2312 so use the field value to update and record the new data len */
2313 o_unit->payload += n_unit->payload; /* update new data len */
2314
2315 /* update field in ip header */
2316 *o_unit->ip_plen = htons(o_ip_len + n_unit->payload);
2317
2318 /* Bring 'PUSH' big, the whql test guide says 'PUSH' can be coalesced
2319 for windows guest, while this may change the behavior for linux
2320 guest (only if it uses RSC feature). */
2321 o_unit->tcp->th_offset_flags = n_unit->tcp->th_offset_flags;
2322
2323 o_unit->tcp->th_ack = n_unit->tcp->th_ack;
2324 o_unit->tcp->th_win = n_unit->tcp->th_win;
2325
2326 memmove(seg->buf + seg->size, data, n_unit->payload);
2327 seg->size += n_unit->payload;
2328 seg->packets++;
2329 chain->stat.coalesced++;
2330 return RSC_COALESCE;
2331 }
2332 }
2333
2334 static int32_t virtio_net_rsc_coalesce4(VirtioNetRscChain *chain,
2335 VirtioNetRscSeg *seg,
2336 const uint8_t *buf, size_t size,
2337 VirtioNetRscUnit *unit)
2338 {
2339 struct ip_header *ip1, *ip2;
2340
2341 ip1 = (struct ip_header *)(unit->ip);
2342 ip2 = (struct ip_header *)(seg->unit.ip);
2343 if ((ip1->ip_src ^ ip2->ip_src) || (ip1->ip_dst ^ ip2->ip_dst)
2344 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport)
2345 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) {
2346 chain->stat.no_match++;
2347 return RSC_NO_MATCH;
2348 }
2349
2350 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit);
2351 }
2352
2353 static int32_t virtio_net_rsc_coalesce6(VirtioNetRscChain *chain,
2354 VirtioNetRscSeg *seg,
2355 const uint8_t *buf, size_t size,
2356 VirtioNetRscUnit *unit)
2357 {
2358 struct ip6_header *ip1, *ip2;
2359
2360 ip1 = (struct ip6_header *)(unit->ip);
2361 ip2 = (struct ip6_header *)(seg->unit.ip);
2362 if (memcmp(&ip1->ip6_src, &ip2->ip6_src, sizeof(struct in6_address))
2363 || memcmp(&ip1->ip6_dst, &ip2->ip6_dst, sizeof(struct in6_address))
2364 || (unit->tcp->th_sport ^ seg->unit.tcp->th_sport)
2365 || (unit->tcp->th_dport ^ seg->unit.tcp->th_dport)) {
2366 chain->stat.no_match++;
2367 return RSC_NO_MATCH;
2368 }
2369
2370 return virtio_net_rsc_coalesce_data(chain, seg, buf, unit);
2371 }
2372
2373 /* Packets with 'SYN' should bypass, other flag should be sent after drain
2374 * to prevent out of order */
2375 static int virtio_net_rsc_tcp_ctrl_check(VirtioNetRscChain *chain,
2376 struct tcp_header *tcp)
2377 {
2378 uint16_t tcp_hdr;
2379 uint16_t tcp_flag;
2380
2381 tcp_flag = htons(tcp->th_offset_flags);
2382 tcp_hdr = (tcp_flag & VIRTIO_NET_TCP_HDR_LENGTH) >> 10;
2383 tcp_flag &= VIRTIO_NET_TCP_FLAG;
2384 if (tcp_flag & TH_SYN) {
2385 chain->stat.tcp_syn++;
2386 return RSC_BYPASS;
2387 }
2388
2389 if (tcp_flag & (TH_FIN | TH_URG | TH_RST | TH_ECE | TH_CWR)) {
2390 chain->stat.tcp_ctrl_drain++;
2391 return RSC_FINAL;
2392 }
2393
2394 if (tcp_hdr > sizeof(struct tcp_header)) {
2395 chain->stat.tcp_all_opt++;
2396 return RSC_FINAL;
2397 }
2398
2399 return RSC_CANDIDATE;
2400 }
2401
2402 static size_t virtio_net_rsc_do_coalesce(VirtioNetRscChain *chain,
2403 NetClientState *nc,
2404 const uint8_t *buf, size_t size,
2405 VirtioNetRscUnit *unit)
2406 {
2407 int ret;
2408 VirtioNetRscSeg *seg, *nseg;
2409
2410 if (QTAILQ_EMPTY(&chain->buffers)) {
2411 chain->stat.empty_cache++;
2412 virtio_net_rsc_cache_buf(chain, nc, buf, size);
2413 timer_mod(chain->drain_timer,
2414 qemu_clock_get_ns(QEMU_CLOCK_HOST) + chain->n->rsc_timeout);
2415 return size;
2416 }
2417
2418 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) {
2419 if (chain->proto == ETH_P_IP) {
2420 ret = virtio_net_rsc_coalesce4(chain, seg, buf, size, unit);
2421 } else {
2422 ret = virtio_net_rsc_coalesce6(chain, seg, buf, size, unit);
2423 }
2424
2425 if (ret == RSC_FINAL) {
2426 if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
2427 /* Send failed */
2428 chain->stat.final_failed++;
2429 return 0;
2430 }
2431
2432 /* Send current packet */
2433 return virtio_net_do_receive(nc, buf, size);
2434 } else if (ret == RSC_NO_MATCH) {
2435 continue;
2436 } else {
2437 /* Coalesced, mark coalesced flag to tell calc cksum for ipv4 */
2438 seg->is_coalesced = 1;
2439 return size;
2440 }
2441 }
2442
2443 chain->stat.no_match_cache++;
2444 virtio_net_rsc_cache_buf(chain, nc, buf, size);
2445 return size;
2446 }
2447
2448 /* Drain a connection data, this is to avoid out of order segments */
2449 static size_t virtio_net_rsc_drain_flow(VirtioNetRscChain *chain,
2450 NetClientState *nc,
2451 const uint8_t *buf, size_t size,
2452 uint16_t ip_start, uint16_t ip_size,
2453 uint16_t tcp_port)
2454 {
2455 VirtioNetRscSeg *seg, *nseg;
2456 uint32_t ppair1, ppair2;
2457
2458 ppair1 = *(uint32_t *)(buf + tcp_port);
2459 QTAILQ_FOREACH_SAFE(seg, &chain->buffers, next, nseg) {
2460 ppair2 = *(uint32_t *)(seg->buf + tcp_port);
2461 if (memcmp(buf + ip_start, seg->buf + ip_start, ip_size)
2462 || (ppair1 != ppair2)) {
2463 continue;
2464 }
2465 if (virtio_net_rsc_drain_seg(chain, seg) == 0) {
2466 chain->stat.drain_failed++;
2467 }
2468
2469 break;
2470 }
2471
2472 return virtio_net_do_receive(nc, buf, size);
2473 }
2474
2475 static int32_t virtio_net_rsc_sanity_check4(VirtioNetRscChain *chain,
2476 struct ip_header *ip,
2477 const uint8_t *buf, size_t size)
2478 {
2479 uint16_t ip_len;
2480
2481 /* Not an ipv4 packet */
2482 if (((ip->ip_ver_len & 0xF0) >> 4) != IP_HEADER_VERSION_4) {
2483 chain->stat.ip_option++;
2484 return RSC_BYPASS;
2485 }
2486
2487 /* Don't handle packets with ip option */
2488 if ((ip->ip_ver_len & 0xF) != VIRTIO_NET_IP4_HEADER_LENGTH) {
2489 chain->stat.ip_option++;
2490 return RSC_BYPASS;
2491 }
2492
2493 if (ip->ip_p != IPPROTO_TCP) {
2494 chain->stat.bypass_not_tcp++;
2495 return RSC_BYPASS;
2496 }
2497
2498 /* Don't handle packets with ip fragment */
2499 if (!(htons(ip->ip_off) & IP_DF)) {
2500 chain->stat.ip_frag++;
2501 return RSC_BYPASS;
2502 }
2503
2504 /* Don't handle packets with ecn flag */
2505 if (IPTOS_ECN(ip->ip_tos)) {
2506 chain->stat.ip_ecn++;
2507 return RSC_BYPASS;
2508 }
2509
2510 ip_len = htons(ip->ip_len);
2511 if (ip_len < (sizeof(struct ip_header) + sizeof(struct tcp_header))
2512 || ip_len > (size - chain->n->guest_hdr_len -
2513 sizeof(struct eth_header))) {
2514 chain->stat.ip_hacked++;
2515 return RSC_BYPASS;
2516 }
2517
2518 return RSC_CANDIDATE;
2519 }
2520
2521 static size_t virtio_net_rsc_receive4(VirtioNetRscChain *chain,
2522 NetClientState *nc,
2523 const uint8_t *buf, size_t size)
2524 {
2525 int32_t ret;
2526 uint16_t hdr_len;
2527 VirtioNetRscUnit unit;
2528
2529 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len;
2530
2531 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header)
2532 + sizeof(struct tcp_header))) {
2533 chain->stat.bypass_not_tcp++;
2534 return virtio_net_do_receive(nc, buf, size);
2535 }
2536
2537 virtio_net_rsc_extract_unit4(chain, buf, &unit);
2538 if (virtio_net_rsc_sanity_check4(chain, unit.ip, buf, size)
2539 != RSC_CANDIDATE) {
2540 return virtio_net_do_receive(nc, buf, size);
2541 }
2542
2543 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp);
2544 if (ret == RSC_BYPASS) {
2545 return virtio_net_do_receive(nc, buf, size);
2546 } else if (ret == RSC_FINAL) {
2547 return virtio_net_rsc_drain_flow(chain, nc, buf, size,
2548 ((hdr_len + sizeof(struct eth_header)) + 12),
2549 VIRTIO_NET_IP4_ADDR_SIZE,
2550 hdr_len + sizeof(struct eth_header) + sizeof(struct ip_header));
2551 }
2552
2553 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit);
2554 }
2555
2556 static int32_t virtio_net_rsc_sanity_check6(VirtioNetRscChain *chain,
2557 struct ip6_header *ip6,
2558 const uint8_t *buf, size_t size)
2559 {
2560 uint16_t ip_len;
2561
2562 if (((ip6->ip6_ctlun.ip6_un1.ip6_un1_flow & 0xF0) >> 4)
2563 != IP_HEADER_VERSION_6) {
2564 return RSC_BYPASS;
2565 }
2566
2567 /* Both option and protocol is checked in this */
2568 if (ip6->ip6_ctlun.ip6_un1.ip6_un1_nxt != IPPROTO_TCP) {
2569 chain->stat.bypass_not_tcp++;
2570 return RSC_BYPASS;
2571 }
2572
2573 ip_len = htons(ip6->ip6_ctlun.ip6_un1.ip6_un1_plen);
2574 if (ip_len < sizeof(struct tcp_header) ||
2575 ip_len > (size - chain->n->guest_hdr_len - sizeof(struct eth_header)
2576 - sizeof(struct ip6_header))) {
2577 chain->stat.ip_hacked++;
2578 return RSC_BYPASS;
2579 }
2580
2581 /* Don't handle packets with ecn flag */
2582 if (IP6_ECN(ip6->ip6_ctlun.ip6_un3.ip6_un3_ecn)) {
2583 chain->stat.ip_ecn++;
2584 return RSC_BYPASS;
2585 }
2586
2587 return RSC_CANDIDATE;
2588 }
2589
2590 static size_t virtio_net_rsc_receive6(void *opq, NetClientState *nc,
2591 const uint8_t *buf, size_t size)
2592 {
2593 int32_t ret;
2594 uint16_t hdr_len;
2595 VirtioNetRscChain *chain;
2596 VirtioNetRscUnit unit;
2597
2598 chain = opq;
2599 hdr_len = ((VirtIONet *)(chain->n))->guest_hdr_len;
2600
2601 if (size < (hdr_len + sizeof(struct eth_header) + sizeof(struct ip6_header)
2602 + sizeof(tcp_header))) {
2603 return virtio_net_do_receive(nc, buf, size);
2604 }
2605
2606 virtio_net_rsc_extract_unit6(chain, buf, &unit);
2607 if (RSC_CANDIDATE != virtio_net_rsc_sanity_check6(chain,
2608 unit.ip, buf, size)) {
2609 return virtio_net_do_receive(nc, buf, size);
2610 }
2611
2612 ret = virtio_net_rsc_tcp_ctrl_check(chain, unit.tcp);
2613 if (ret == RSC_BYPASS) {
2614 return virtio_net_do_receive(nc, buf, size);
2615 } else if (ret == RSC_FINAL) {
2616 return virtio_net_rsc_drain_flow(chain, nc, buf, size,
2617 ((hdr_len + sizeof(struct eth_header)) + 8),
2618 VIRTIO_NET_IP6_ADDR_SIZE,
2619 hdr_len + sizeof(struct eth_header)
2620 + sizeof(struct ip6_header));
2621 }
2622
2623 return virtio_net_rsc_do_coalesce(chain, nc, buf, size, &unit);
2624 }
2625
2626 static VirtioNetRscChain *virtio_net_rsc_lookup_chain(VirtIONet *n,
2627 NetClientState *nc,
2628 uint16_t proto)
2629 {
2630 VirtioNetRscChain *chain;
2631
2632 if ((proto != (uint16_t)ETH_P_IP) && (proto != (uint16_t)ETH_P_IPV6)) {
2633 return NULL;
2634 }
2635
2636 QTAILQ_FOREACH(chain, &n->rsc_chains, next) {
2637 if (chain->proto == proto) {
2638 return chain;
2639 }
2640 }
2641
2642 chain = g_malloc(sizeof(*chain));
2643 chain->n = n;
2644 chain->proto = proto;
2645 if (proto == (uint16_t)ETH_P_IP) {
2646 chain->max_payload = VIRTIO_NET_MAX_IP4_PAYLOAD;
2647 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
2648 } else {
2649 chain->max_payload = VIRTIO_NET_MAX_IP6_PAYLOAD;
2650 chain->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
2651 }
2652 chain->drain_timer = timer_new_ns(QEMU_CLOCK_HOST,
2653 virtio_net_rsc_purge, chain);
2654 memset(&chain->stat, 0, sizeof(chain->stat));
2655
2656 QTAILQ_INIT(&chain->buffers);
2657 QTAILQ_INSERT_TAIL(&n->rsc_chains, chain, next);
2658
2659 return chain;
2660 }
2661
2662 static ssize_t virtio_net_rsc_receive(NetClientState *nc,
2663 const uint8_t *buf,
2664 size_t size)
2665 {
2666 uint16_t proto;
2667 VirtioNetRscChain *chain;
2668 struct eth_header *eth;
2669 VirtIONet *n;
2670
2671 n = qemu_get_nic_opaque(nc);
2672 if (size < (n->host_hdr_len + sizeof(struct eth_header))) {
2673 return virtio_net_do_receive(nc, buf, size);
2674 }
2675
2676 eth = (struct eth_header *)(buf + n->guest_hdr_len);
2677 proto = htons(eth->h_proto);
2678
2679 chain = virtio_net_rsc_lookup_chain(n, nc, proto);
2680 if (chain) {
2681 chain->stat.received++;
2682 if (proto == (uint16_t)ETH_P_IP && n->rsc4_enabled) {
2683 return virtio_net_rsc_receive4(chain, nc, buf, size);
2684 } else if (proto == (uint16_t)ETH_P_IPV6 && n->rsc6_enabled) {
2685 return virtio_net_rsc_receive6(chain, nc, buf, size);
2686 }
2687 }
2688 return virtio_net_do_receive(nc, buf, size);
2689 }
2690
2691 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf,
2692 size_t size)
2693 {
2694 VirtIONet *n = qemu_get_nic_opaque(nc);
2695 if ((n->rsc4_enabled || n->rsc6_enabled)) {
2696 return virtio_net_rsc_receive(nc, buf, size);
2697 } else {
2698 return virtio_net_do_receive(nc, buf, size);
2699 }
2700 }
2701
2702 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
2703
2704 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
2705 {
2706 VirtIONet *n = qemu_get_nic_opaque(nc);
2707 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
2708 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2709 int ret;
2710
2711 virtqueue_push(q->tx_vq, q->async_tx.elem, 0);
2712 virtio_notify(vdev, q->tx_vq);
2713
2714 g_free(q->async_tx.elem);
2715 q->async_tx.elem = NULL;
2716
2717 virtio_queue_set_notification(q->tx_vq, 1);
2718 ret = virtio_net_flush_tx(q);
2719 if (ret >= n->tx_burst) {
2720 /*
2721 * the flush has been stopped by tx_burst
2722 * we will not receive notification for the
2723 * remainining part, so re-schedule
2724 */
2725 virtio_queue_set_notification(q->tx_vq, 0);
2726 if (q->tx_bh) {
2727 qemu_bh_schedule(q->tx_bh);
2728 } else {
2729 timer_mod(q->tx_timer,
2730 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
2731 }
2732 q->tx_waiting = 1;
2733 }
2734 }
2735
2736 /* TX */
2737 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
2738 {
2739 VirtIONet *n = q->n;
2740 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2741 VirtQueueElement *elem;
2742 int32_t num_packets = 0;
2743 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
2744 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
2745 return num_packets;
2746 }
2747
2748 if (q->async_tx.elem) {
2749 virtio_queue_set_notification(q->tx_vq, 0);
2750 return num_packets;
2751 }
2752
2753 for (;;) {
2754 ssize_t ret;
2755 unsigned int out_num;
2756 struct iovec sg[VIRTQUEUE_MAX_SIZE], sg2[VIRTQUEUE_MAX_SIZE + 1], *out_sg;
2757 struct virtio_net_hdr_v1_hash vhdr;
2758
2759 elem = virtqueue_pop(q->tx_vq, sizeof(VirtQueueElement));
2760 if (!elem) {
2761 break;
2762 }
2763
2764 out_num = elem->out_num;
2765 out_sg = elem->out_sg;
2766 if (out_num < 1) {
2767 virtio_error(vdev, "virtio-net header not in first element");
2768 virtqueue_detach_element(q->tx_vq, elem, 0);
2769 g_free(elem);
2770 return -EINVAL;
2771 }
2772
2773 if (n->has_vnet_hdr) {
2774 if (iov_to_buf(out_sg, out_num, 0, &vhdr, n->guest_hdr_len) <
2775 n->guest_hdr_len) {
2776 virtio_error(vdev, "virtio-net header incorrect");
2777 virtqueue_detach_element(q->tx_vq, elem, 0);
2778 g_free(elem);
2779 return -EINVAL;
2780 }
2781 if (n->needs_vnet_hdr_swap) {
2782 virtio_net_hdr_swap(vdev, (void *) &vhdr);
2783 sg2[0].iov_base = &vhdr;
2784 sg2[0].iov_len = n->guest_hdr_len;
2785 out_num = iov_copy(&sg2[1], ARRAY_SIZE(sg2) - 1,
2786 out_sg, out_num,
2787 n->guest_hdr_len, -1);
2788 if (out_num == VIRTQUEUE_MAX_SIZE) {
2789 goto drop;
2790 }
2791 out_num += 1;
2792 out_sg = sg2;
2793 }
2794 }
2795 /*
2796 * If host wants to see the guest header as is, we can
2797 * pass it on unchanged. Otherwise, copy just the parts
2798 * that host is interested in.
2799 */
2800 assert(n->host_hdr_len <= n->guest_hdr_len);
2801 if (n->host_hdr_len != n->guest_hdr_len) {
2802 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
2803 out_sg, out_num,
2804 0, n->host_hdr_len);
2805 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
2806 out_sg, out_num,
2807 n->guest_hdr_len, -1);
2808 out_num = sg_num;
2809 out_sg = sg;
2810 }
2811
2812 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
2813 out_sg, out_num, virtio_net_tx_complete);
2814 if (ret == 0) {
2815 virtio_queue_set_notification(q->tx_vq, 0);
2816 q->async_tx.elem = elem;
2817 return -EBUSY;
2818 }
2819
2820 drop:
2821 virtqueue_push(q->tx_vq, elem, 0);
2822 virtio_notify(vdev, q->tx_vq);
2823 g_free(elem);
2824
2825 if (++num_packets >= n->tx_burst) {
2826 break;
2827 }
2828 }
2829 return num_packets;
2830 }
2831
2832 static void virtio_net_tx_timer(void *opaque);
2833
2834 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
2835 {
2836 VirtIONet *n = VIRTIO_NET(vdev);
2837 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
2838
2839 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
2840 virtio_net_drop_tx_queue_data(vdev, vq);
2841 return;
2842 }
2843
2844 /* This happens when device was stopped but VCPU wasn't. */
2845 if (!vdev->vm_running) {
2846 q->tx_waiting = 1;
2847 return;
2848 }
2849
2850 if (q->tx_waiting) {
2851 /* We already have queued packets, immediately flush */
2852 timer_del(q->tx_timer);
2853 virtio_net_tx_timer(q);
2854 } else {
2855 /* re-arm timer to flush it (and more) on next tick */
2856 timer_mod(q->tx_timer,
2857 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
2858 q->tx_waiting = 1;
2859 virtio_queue_set_notification(vq, 0);
2860 }
2861 }
2862
2863 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
2864 {
2865 VirtIONet *n = VIRTIO_NET(vdev);
2866 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
2867
2868 if (unlikely((n->status & VIRTIO_NET_S_LINK_UP) == 0)) {
2869 virtio_net_drop_tx_queue_data(vdev, vq);
2870 return;
2871 }
2872
2873 if (unlikely(q->tx_waiting)) {
2874 return;
2875 }
2876 q->tx_waiting = 1;
2877 /* This happens when device was stopped but VCPU wasn't. */
2878 if (!vdev->vm_running) {
2879 return;
2880 }
2881 virtio_queue_set_notification(vq, 0);
2882 qemu_bh_schedule(q->tx_bh);
2883 }
2884
2885 static void virtio_net_tx_timer(void *opaque)
2886 {
2887 VirtIONetQueue *q = opaque;
2888 VirtIONet *n = q->n;
2889 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2890 int ret;
2891
2892 /* This happens when device was stopped but BH wasn't. */
2893 if (!vdev->vm_running) {
2894 /* Make sure tx waiting is set, so we'll run when restarted. */
2895 assert(q->tx_waiting);
2896 return;
2897 }
2898
2899 q->tx_waiting = 0;
2900
2901 /* Just in case the driver is not ready on more */
2902 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
2903 return;
2904 }
2905
2906 ret = virtio_net_flush_tx(q);
2907 if (ret == -EBUSY || ret == -EINVAL) {
2908 return;
2909 }
2910 /*
2911 * If we flush a full burst of packets, assume there are
2912 * more coming and immediately rearm
2913 */
2914 if (ret >= n->tx_burst) {
2915 q->tx_waiting = 1;
2916 timer_mod(q->tx_timer,
2917 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
2918 return;
2919 }
2920 /*
2921 * If less than a full burst, re-enable notification and flush
2922 * anything that may have come in while we weren't looking. If
2923 * we find something, assume the guest is still active and rearm
2924 */
2925 virtio_queue_set_notification(q->tx_vq, 1);
2926 ret = virtio_net_flush_tx(q);
2927 if (ret > 0) {
2928 virtio_queue_set_notification(q->tx_vq, 0);
2929 q->tx_waiting = 1;
2930 timer_mod(q->tx_timer,
2931 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
2932 }
2933 }
2934
2935 static void virtio_net_tx_bh(void *opaque)
2936 {
2937 VirtIONetQueue *q = opaque;
2938 VirtIONet *n = q->n;
2939 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2940 int32_t ret;
2941
2942 /* This happens when device was stopped but BH wasn't. */
2943 if (!vdev->vm_running) {
2944 /* Make sure tx waiting is set, so we'll run when restarted. */
2945 assert(q->tx_waiting);
2946 return;
2947 }
2948
2949 q->tx_waiting = 0;
2950
2951 /* Just in case the driver is not ready on more */
2952 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
2953 return;
2954 }
2955
2956 ret = virtio_net_flush_tx(q);
2957 if (ret == -EBUSY || ret == -EINVAL) {
2958 return; /* Notification re-enable handled by tx_complete or device
2959 * broken */
2960 }
2961
2962 /* If we flush a full burst of packets, assume there are
2963 * more coming and immediately reschedule */
2964 if (ret >= n->tx_burst) {
2965 qemu_bh_schedule(q->tx_bh);
2966 q->tx_waiting = 1;
2967 return;
2968 }
2969
2970 /* If less than a full burst, re-enable notification and flush
2971 * anything that may have come in while we weren't looking. If
2972 * we find something, assume the guest is still active and reschedule */
2973 virtio_queue_set_notification(q->tx_vq, 1);
2974 ret = virtio_net_flush_tx(q);
2975 if (ret == -EINVAL) {
2976 return;
2977 } else if (ret > 0) {
2978 virtio_queue_set_notification(q->tx_vq, 0);
2979 qemu_bh_schedule(q->tx_bh);
2980 q->tx_waiting = 1;
2981 }
2982 }
2983
2984 static void virtio_net_add_queue(VirtIONet *n, int index)
2985 {
2986 VirtIODevice *vdev = VIRTIO_DEVICE(n);
2987
2988 n->vqs[index].rx_vq = virtio_add_queue(vdev, n->net_conf.rx_queue_size,
2989 virtio_net_handle_rx);
2990
2991 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
2992 n->vqs[index].tx_vq =
2993 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
2994 virtio_net_handle_tx_timer);
2995 n->vqs[index].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
2996 virtio_net_tx_timer,
2997 &n->vqs[index]);
2998 } else {
2999 n->vqs[index].tx_vq =
3000 virtio_add_queue(vdev, n->net_conf.tx_queue_size,
3001 virtio_net_handle_tx_bh);
3002 n->vqs[index].tx_bh = qemu_bh_new_guarded(virtio_net_tx_bh, &n->vqs[index],
3003 &DEVICE(vdev)->mem_reentrancy_guard);
3004 }
3005
3006 n->vqs[index].tx_waiting = 0;
3007 n->vqs[index].n = n;
3008 }
3009
3010 static void virtio_net_del_queue(VirtIONet *n, int index)
3011 {
3012 VirtIODevice *vdev = VIRTIO_DEVICE(n);
3013 VirtIONetQueue *q = &n->vqs[index];
3014 NetClientState *nc = qemu_get_subqueue(n->nic, index);
3015
3016 qemu_purge_queued_packets(nc);
3017
3018 virtio_del_queue(vdev, index * 2);
3019 if (q->tx_timer) {
3020 timer_free(q->tx_timer);
3021 q->tx_timer = NULL;
3022 } else {
3023 qemu_bh_delete(q->tx_bh);
3024 q->tx_bh = NULL;
3025 }
3026 q->tx_waiting = 0;
3027 virtio_del_queue(vdev, index * 2 + 1);
3028 }
3029
3030 static void virtio_net_change_num_queue_pairs(VirtIONet *n, int new_max_queue_pairs)
3031 {
3032 VirtIODevice *vdev = VIRTIO_DEVICE(n);
3033 int old_num_queues = virtio_get_num_queues(vdev);
3034 int new_num_queues = new_max_queue_pairs * 2 + 1;
3035 int i;
3036
3037 assert(old_num_queues >= 3);
3038 assert(old_num_queues % 2 == 1);
3039
3040 if (old_num_queues == new_num_queues) {
3041 return;
3042 }
3043
3044 /*
3045 * We always need to remove and add ctrl vq if
3046 * old_num_queues != new_num_queues. Remove ctrl_vq first,
3047 * and then we only enter one of the following two loops.
3048 */
3049 virtio_del_queue(vdev, old_num_queues - 1);
3050
3051 for (i = new_num_queues - 1; i < old_num_queues - 1; i += 2) {
3052 /* new_num_queues < old_num_queues */
3053 virtio_net_del_queue(n, i / 2);
3054 }
3055
3056 for (i = old_num_queues - 1; i < new_num_queues - 1; i += 2) {
3057 /* new_num_queues > old_num_queues */
3058 virtio_net_add_queue(n, i / 2);
3059 }
3060
3061 /* add ctrl_vq last */
3062 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
3063 }
3064
3065 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
3066 {
3067 int max = multiqueue ? n->max_queue_pairs : 1;
3068
3069 n->multiqueue = multiqueue;
3070 virtio_net_change_num_queue_pairs(n, max);
3071
3072 virtio_net_set_queue_pairs(n);
3073 }
3074
3075 static int virtio_net_post_load_device(void *opaque, int version_id)
3076 {
3077 VirtIONet *n = opaque;
3078 VirtIODevice *vdev = VIRTIO_DEVICE(n);
3079 int i, link_down;
3080
3081 trace_virtio_net_post_load_device();
3082 virtio_net_set_mrg_rx_bufs(n, n->mergeable_rx_bufs,
3083 virtio_vdev_has_feature(vdev,
3084 VIRTIO_F_VERSION_1),
3085 virtio_vdev_has_feature(vdev,
3086 VIRTIO_NET_F_HASH_REPORT));
3087
3088 /* MAC_TABLE_ENTRIES may be different from the saved image */
3089 if (n->mac_table.in_use > MAC_TABLE_ENTRIES) {
3090 n->mac_table.in_use = 0;
3091 }
3092
3093 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
3094 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
3095 }
3096
3097 /*
3098 * curr_guest_offloads will be later overwritten by the
3099 * virtio_set_features_nocheck call done from the virtio_load.
3100 * Here we make sure it is preserved and restored accordingly
3101 * in the virtio_net_post_load_virtio callback.
3102 */
3103 n->saved_guest_offloads = n->curr_guest_offloads;
3104
3105 virtio_net_set_queue_pairs(n);
3106
3107 /* Find the first multicast entry in the saved MAC filter */
3108 for (i = 0; i < n->mac_table.in_use; i++) {
3109 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
3110 break;
3111 }
3112 }
3113 n->mac_table.first_multi = i;
3114
3115 /* nc.link_down can't be migrated, so infer link_down according
3116 * to link status bit in n->status */
3117 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
3118 for (i = 0; i < n->max_queue_pairs; i++) {
3119 qemu_get_subqueue(n->nic, i)->link_down = link_down;
3120 }
3121
3122 if (virtio_vdev_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
3123 virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
3124 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(),
3125 QEMU_CLOCK_VIRTUAL,
3126 virtio_net_announce_timer, n);
3127 if (n->announce_timer.round) {
3128 timer_mod(n->announce_timer.tm,
3129 qemu_clock_get_ms(n->announce_timer.type));
3130 } else {
3131 qemu_announce_timer_del(&n->announce_timer, false);
3132 }
3133 }
3134
3135 if (n->rss_data.enabled) {
3136 n->rss_data.enabled_software_rss = n->rss_data.populate_hash;
3137 if (!n->rss_data.populate_hash) {
3138 if (!virtio_net_attach_epbf_rss(n)) {
3139 if (get_vhost_net(qemu_get_queue(n->nic)->peer)) {
3140 warn_report("Can't post-load eBPF RSS for vhost");
3141 } else {
3142 warn_report("Can't post-load eBPF RSS - "
3143 "fallback to software RSS");
3144 n->rss_data.enabled_software_rss = true;
3145 }
3146 }
3147 }
3148
3149 trace_virtio_net_rss_enable(n->rss_data.hash_types,
3150 n->rss_data.indirections_len,
3151 sizeof(n->rss_data.key));
3152 } else {
3153 trace_virtio_net_rss_disable();
3154 }
3155 return 0;
3156 }
3157
3158 static int virtio_net_post_load_virtio(VirtIODevice *vdev)
3159 {
3160 VirtIONet *n = VIRTIO_NET(vdev);
3161 /*
3162 * The actual needed state is now in saved_guest_offloads,
3163 * see virtio_net_post_load_device for detail.
3164 * Restore it back and apply the desired offloads.
3165 */
3166 n->curr_guest_offloads = n->saved_guest_offloads;
3167 if (peer_has_vnet_hdr(n)) {
3168 virtio_net_apply_guest_offloads(n);
3169 }
3170
3171 return 0;
3172 }
3173
3174 /* tx_waiting field of a VirtIONetQueue */
3175 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting = {
3176 .name = "virtio-net-queue-tx_waiting",
3177 .fields = (const VMStateField[]) {
3178 VMSTATE_UINT32(tx_waiting, VirtIONetQueue),
3179 VMSTATE_END_OF_LIST()
3180 },
3181 };
3182
3183 static bool max_queue_pairs_gt_1(void *opaque, int version_id)
3184 {
3185 return VIRTIO_NET(opaque)->max_queue_pairs > 1;
3186 }
3187
3188 static bool has_ctrl_guest_offloads(void *opaque, int version_id)
3189 {
3190 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque),
3191 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS);
3192 }
3193
3194 static bool mac_table_fits(void *opaque, int version_id)
3195 {
3196 return VIRTIO_NET(opaque)->mac_table.in_use <= MAC_TABLE_ENTRIES;
3197 }
3198
3199 static bool mac_table_doesnt_fit(void *opaque, int version_id)
3200 {
3201 return !mac_table_fits(opaque, version_id);
3202 }
3203
3204 /* This temporary type is shared by all the WITH_TMP methods
3205 * although only some fields are used by each.
3206 */
3207 struct VirtIONetMigTmp {
3208 VirtIONet *parent;
3209 VirtIONetQueue *vqs_1;
3210 uint16_t curr_queue_pairs_1;
3211 uint8_t has_ufo;
3212 uint32_t has_vnet_hdr;
3213 };
3214
3215 /* The 2nd and subsequent tx_waiting flags are loaded later than
3216 * the 1st entry in the queue_pairs and only if there's more than one
3217 * entry. We use the tmp mechanism to calculate a temporary
3218 * pointer and count and also validate the count.
3219 */
3220
3221 static int virtio_net_tx_waiting_pre_save(void *opaque)
3222 {
3223 struct VirtIONetMigTmp *tmp = opaque;
3224
3225 tmp->vqs_1 = tmp->parent->vqs + 1;
3226 tmp->curr_queue_pairs_1 = tmp->parent->curr_queue_pairs - 1;
3227 if (tmp->parent->curr_queue_pairs == 0) {
3228 tmp->curr_queue_pairs_1 = 0;
3229 }
3230
3231 return 0;
3232 }
3233
3234 static int virtio_net_tx_waiting_pre_load(void *opaque)
3235 {
3236 struct VirtIONetMigTmp *tmp = opaque;
3237
3238 /* Reuse the pointer setup from save */
3239 virtio_net_tx_waiting_pre_save(opaque);
3240
3241 if (tmp->parent->curr_queue_pairs > tmp->parent->max_queue_pairs) {
3242 error_report("virtio-net: curr_queue_pairs %x > max_queue_pairs %x",
3243 tmp->parent->curr_queue_pairs, tmp->parent->max_queue_pairs);
3244
3245 return -EINVAL;
3246 }
3247
3248 return 0; /* all good */
3249 }
3250
3251 static const VMStateDescription vmstate_virtio_net_tx_waiting = {
3252 .name = "virtio-net-tx_waiting",
3253 .pre_load = virtio_net_tx_waiting_pre_load,
3254 .pre_save = virtio_net_tx_waiting_pre_save,
3255 .fields = (const VMStateField[]) {
3256 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1, struct VirtIONetMigTmp,
3257 curr_queue_pairs_1,
3258 vmstate_virtio_net_queue_tx_waiting,
3259 struct VirtIONetQueue),
3260 VMSTATE_END_OF_LIST()
3261 },
3262 };
3263
3264 /* the 'has_ufo' flag is just tested; if the incoming stream has the
3265 * flag set we need to check that we have it
3266 */
3267 static int virtio_net_ufo_post_load(void *opaque, int version_id)
3268 {
3269 struct VirtIONetMigTmp *tmp = opaque;
3270
3271 if (tmp->has_ufo && !peer_has_ufo(tmp->parent)) {
3272 error_report("virtio-net: saved image requires TUN_F_UFO support");
3273 return -EINVAL;
3274 }
3275
3276 return 0;
3277 }
3278
3279 static int virtio_net_ufo_pre_save(void *opaque)
3280 {
3281 struct VirtIONetMigTmp *tmp = opaque;
3282
3283 tmp->has_ufo = tmp->parent->has_ufo;
3284
3285 return 0;
3286 }
3287
3288 static const VMStateDescription vmstate_virtio_net_has_ufo = {
3289 .name = "virtio-net-ufo",
3290 .post_load = virtio_net_ufo_post_load,
3291 .pre_save = virtio_net_ufo_pre_save,
3292 .fields = (const VMStateField[]) {
3293 VMSTATE_UINT8(has_ufo, struct VirtIONetMigTmp),
3294 VMSTATE_END_OF_LIST()
3295 },
3296 };
3297
3298 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
3299 * flag set we need to check that we have it
3300 */
3301 static int virtio_net_vnet_post_load(void *opaque, int version_id)
3302 {
3303 struct VirtIONetMigTmp *tmp = opaque;
3304
3305 if (tmp->has_vnet_hdr && !peer_has_vnet_hdr(tmp->parent)) {
3306 error_report("virtio-net: saved image requires vnet_hdr=on");
3307 return -EINVAL;
3308 }
3309
3310 return 0;
3311 }
3312
3313 static int virtio_net_vnet_pre_save(void *opaque)
3314 {
3315 struct VirtIONetMigTmp *tmp = opaque;
3316
3317 tmp->has_vnet_hdr = tmp->parent->has_vnet_hdr;
3318
3319 return 0;
3320 }
3321
3322 static const VMStateDescription vmstate_virtio_net_has_vnet = {
3323 .name = "virtio-net-vnet",
3324 .post_load = virtio_net_vnet_post_load,
3325 .pre_save = virtio_net_vnet_pre_save,
3326 .fields = (const VMStateField[]) {
3327 VMSTATE_UINT32(has_vnet_hdr, struct VirtIONetMigTmp),
3328 VMSTATE_END_OF_LIST()
3329 },
3330 };
3331
3332 static bool virtio_net_rss_needed(void *opaque)
3333 {
3334 return VIRTIO_NET(opaque)->rss_data.enabled;
3335 }
3336
3337 static const VMStateDescription vmstate_virtio_net_rss = {
3338 .name = "virtio-net-device/rss",
3339 .version_id = 1,
3340 .minimum_version_id = 1,
3341 .needed = virtio_net_rss_needed,
3342 .fields = (const VMStateField[]) {
3343 VMSTATE_BOOL(rss_data.enabled, VirtIONet),
3344 VMSTATE_BOOL(rss_data.redirect, VirtIONet),
3345 VMSTATE_BOOL(rss_data.populate_hash, VirtIONet),
3346 VMSTATE_UINT32(rss_data.hash_types, VirtIONet),
3347 VMSTATE_UINT16(rss_data.indirections_len, VirtIONet),
3348 VMSTATE_UINT16(rss_data.default_queue, VirtIONet),
3349 VMSTATE_UINT8_ARRAY(rss_data.key, VirtIONet,
3350 VIRTIO_NET_RSS_MAX_KEY_SIZE),
3351 VMSTATE_VARRAY_UINT16_ALLOC(rss_data.indirections_table, VirtIONet,
3352 rss_data.indirections_len, 0,
3353 vmstate_info_uint16, uint16_t),
3354 VMSTATE_END_OF_LIST()
3355 },
3356 };
3357
3358 static const VMStateDescription vmstate_virtio_net_device = {
3359 .name = "virtio-net-device",
3360 .version_id = VIRTIO_NET_VM_VERSION,
3361 .minimum_version_id = VIRTIO_NET_VM_VERSION,
3362 .post_load = virtio_net_post_load_device,
3363 .fields = (const VMStateField[]) {
3364 VMSTATE_UINT8_ARRAY(mac, VirtIONet, ETH_ALEN),
3365 VMSTATE_STRUCT_POINTER(vqs, VirtIONet,
3366 vmstate_virtio_net_queue_tx_waiting,
3367 VirtIONetQueue),
3368 VMSTATE_UINT32(mergeable_rx_bufs, VirtIONet),
3369 VMSTATE_UINT16(status, VirtIONet),
3370 VMSTATE_UINT8(promisc, VirtIONet),
3371 VMSTATE_UINT8(allmulti, VirtIONet),
3372 VMSTATE_UINT32(mac_table.in_use, VirtIONet),
3373
3374 /* Guarded pair: If it fits we load it, else we throw it away
3375 * - can happen if source has a larger MAC table.; post-load
3376 * sets flags in this case.
3377 */
3378 VMSTATE_VBUFFER_MULTIPLY(mac_table.macs, VirtIONet,
3379 0, mac_table_fits, mac_table.in_use,
3380 ETH_ALEN),
3381 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet, mac_table_doesnt_fit, 0,
3382 mac_table.in_use, ETH_ALEN),
3383
3384 /* Note: This is an array of uint32's that's always been saved as a
3385 * buffer; hold onto your endiannesses; it's actually used as a bitmap
3386 * but based on the uint.
3387 */
3388 VMSTATE_BUFFER_POINTER_UNSAFE(vlans, VirtIONet, 0, MAX_VLAN >> 3),
3389 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
3390 vmstate_virtio_net_has_vnet),
3391 VMSTATE_UINT8(mac_table.multi_overflow, VirtIONet),
3392 VMSTATE_UINT8(mac_table.uni_overflow, VirtIONet),
3393 VMSTATE_UINT8(alluni, VirtIONet),
3394 VMSTATE_UINT8(nomulti, VirtIONet),
3395 VMSTATE_UINT8(nouni, VirtIONet),
3396 VMSTATE_UINT8(nobcast, VirtIONet),
3397 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
3398 vmstate_virtio_net_has_ufo),
3399 VMSTATE_SINGLE_TEST(max_queue_pairs, VirtIONet, max_queue_pairs_gt_1, 0,
3400 vmstate_info_uint16_equal, uint16_t),
3401 VMSTATE_UINT16_TEST(curr_queue_pairs, VirtIONet, max_queue_pairs_gt_1),
3402 VMSTATE_WITH_TMP(VirtIONet, struct VirtIONetMigTmp,
3403 vmstate_virtio_net_tx_waiting),
3404 VMSTATE_UINT64_TEST(curr_guest_offloads, VirtIONet,
3405 has_ctrl_guest_offloads),
3406 VMSTATE_END_OF_LIST()
3407 },
3408 .subsections = (const VMStateDescription * const []) {
3409 &vmstate_virtio_net_rss,
3410 NULL
3411 }
3412 };
3413
3414 static NetClientInfo net_virtio_info = {
3415 .type = NET_CLIENT_DRIVER_NIC,
3416 .size = sizeof(NICState),
3417 .can_receive = virtio_net_can_receive,
3418 .receive = virtio_net_receive,
3419 .link_status_changed = virtio_net_set_link_status,
3420 .query_rx_filter = virtio_net_query_rxfilter,
3421 .announce = virtio_net_announce,
3422 };
3423
3424 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
3425 {
3426 VirtIONet *n = VIRTIO_NET(vdev);
3427 NetClientState *nc;
3428 assert(n->vhost_started);
3429 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ) && idx == 2) {
3430 /* Must guard against invalid features and bogus queue index
3431 * from being set by malicious guest, or penetrated through
3432 * buggy migration stream.
3433 */
3434 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
3435 qemu_log_mask(LOG_GUEST_ERROR,
3436 "%s: bogus vq index ignored\n", __func__);
3437 return false;
3438 }
3439 nc = qemu_get_subqueue(n->nic, n->max_queue_pairs);
3440 } else {
3441 nc = qemu_get_subqueue(n->nic, vq2q(idx));
3442 }
3443 /*
3444 * Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1
3445 * as the macro of configure interrupt's IDX, If this driver does not
3446 * support, the function will return false
3447 */
3448
3449 if (idx == VIRTIO_CONFIG_IRQ_IDX) {
3450 return vhost_net_config_pending(get_vhost_net(nc->peer));
3451 }
3452 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
3453 }
3454
3455 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
3456 bool mask)
3457 {
3458 VirtIONet *n = VIRTIO_NET(vdev);
3459 NetClientState *nc;
3460 assert(n->vhost_started);
3461 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_MQ) && idx == 2) {
3462 /* Must guard against invalid features and bogus queue index
3463 * from being set by malicious guest, or penetrated through
3464 * buggy migration stream.
3465 */
3466 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
3467 qemu_log_mask(LOG_GUEST_ERROR,
3468 "%s: bogus vq index ignored\n", __func__);
3469 return;
3470 }
3471 nc = qemu_get_subqueue(n->nic, n->max_queue_pairs);
3472 } else {
3473 nc = qemu_get_subqueue(n->nic, vq2q(idx));
3474 }
3475 /*
3476 *Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1
3477 * as the macro of configure interrupt's IDX, If this driver does not
3478 * support, the function will return
3479 */
3480
3481 if (idx == VIRTIO_CONFIG_IRQ_IDX) {
3482 vhost_net_config_mask(get_vhost_net(nc->peer), vdev, mask);
3483 return;
3484 }
3485 vhost_net_virtqueue_mask(get_vhost_net(nc->peer), vdev, idx, mask);
3486 }
3487
3488 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
3489 {
3490 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
3491
3492 n->config_size = virtio_get_config_size(&cfg_size_params, host_features);
3493 }
3494
3495 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
3496 const char *type)
3497 {
3498 /*
3499 * The name can be NULL, the netclient name will be type.x.
3500 */
3501 assert(type != NULL);
3502
3503 g_free(n->netclient_name);
3504 g_free(n->netclient_type);
3505 n->netclient_name = g_strdup(name);
3506 n->netclient_type = g_strdup(type);
3507 }
3508
3509 static bool failover_unplug_primary(VirtIONet *n, DeviceState *dev)
3510 {
3511 HotplugHandler *hotplug_ctrl;
3512 PCIDevice *pci_dev;
3513 Error *err = NULL;
3514
3515 hotplug_ctrl = qdev_get_hotplug_handler(dev);
3516 if (hotplug_ctrl) {
3517 pci_dev = PCI_DEVICE(dev);
3518 pci_dev->partially_hotplugged = true;
3519 hotplug_handler_unplug_request(hotplug_ctrl, dev, &err);
3520 if (err) {
3521 error_report_err(err);
3522 return false;
3523 }
3524 } else {
3525 return false;
3526 }
3527 return true;
3528 }
3529
3530 static bool failover_replug_primary(VirtIONet *n, DeviceState *dev,
3531 Error **errp)
3532 {
3533 Error *err = NULL;
3534 HotplugHandler *hotplug_ctrl;
3535 PCIDevice *pdev = PCI_DEVICE(dev);
3536 BusState *primary_bus;
3537
3538 if (!pdev->partially_hotplugged) {
3539 return true;
3540 }
3541 primary_bus = dev->parent_bus;
3542 if (!primary_bus) {
3543 error_setg(errp, "virtio_net: couldn't find primary bus");
3544 return false;
3545 }
3546 qdev_set_parent_bus(dev, primary_bus, &error_abort);
3547 qatomic_set(&n->failover_primary_hidden, false);
3548 hotplug_ctrl = qdev_get_hotplug_handler(dev);
3549 if (hotplug_ctrl) {
3550 hotplug_handler_pre_plug(hotplug_ctrl, dev, &err);
3551 if (err) {
3552 goto out;
3553 }
3554 hotplug_handler_plug(hotplug_ctrl, dev, &err);
3555 }
3556 pdev->partially_hotplugged = false;
3557
3558 out:
3559 error_propagate(errp, err);
3560 return !err;
3561 }
3562
3563 static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationEvent *e)
3564 {
3565 bool should_be_hidden;
3566 Error *err = NULL;
3567 DeviceState *dev = failover_find_primary_device(n);
3568
3569 if (!dev) {
3570 return;
3571 }
3572
3573 should_be_hidden = qatomic_read(&n->failover_primary_hidden);
3574
3575 if (e->type == MIG_EVENT_PRECOPY_SETUP && !should_be_hidden) {
3576 if (failover_unplug_primary(n, dev)) {
3577 vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev);
3578 qapi_event_send_unplug_primary(dev->id);
3579 qatomic_set(&n->failover_primary_hidden, true);
3580 } else {
3581 warn_report("couldn't unplug primary device");
3582 }
3583 } else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
3584 /* We already unplugged the device let's plug it back */
3585 if (!failover_replug_primary(n, dev, &err)) {
3586 if (err) {
3587 error_report_err(err);
3588 }
3589 }
3590 }
3591 }
3592
3593 static int virtio_net_migration_state_notifier(NotifierWithReturn *notifier,
3594 MigrationEvent *e, Error **errp)
3595 {
3596 VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
3597 virtio_net_handle_migration_primary(n, e);
3598 return 0;
3599 }
3600
3601 static bool failover_hide_primary_device(DeviceListener *listener,
3602 const QDict *device_opts,
3603 bool from_json,
3604 Error **errp)
3605 {
3606 VirtIONet *n = container_of(listener, VirtIONet, primary_listener);
3607 const char *standby_id;
3608
3609 if (!device_opts) {
3610 return false;
3611 }
3612
3613 if (!qdict_haskey(device_opts, "failover_pair_id")) {
3614 return false;
3615 }
3616
3617 if (!qdict_haskey(device_opts, "id")) {
3618 error_setg(errp, "Device with failover_pair_id needs to have id");
3619 return false;
3620 }
3621
3622 standby_id = qdict_get_str(device_opts, "failover_pair_id");
3623 if (g_strcmp0(standby_id, n->netclient_name) != 0) {
3624 return false;
3625 }
3626
3627 /*
3628 * The hide helper can be called several times for a given device.
3629 * Check there is only one primary for a virtio-net device but
3630 * don't duplicate the qdict several times if it's called for the same
3631 * device.
3632 */
3633 if (n->primary_opts) {
3634 const char *old, *new;
3635 /* devices with failover_pair_id always have an id */
3636 old = qdict_get_str(n->primary_opts, "id");
3637 new = qdict_get_str(device_opts, "id");
3638 if (strcmp(old, new) != 0) {
3639 error_setg(errp, "Cannot attach more than one primary device to "
3640 "'%s': '%s' and '%s'", n->netclient_name, old, new);
3641 return false;
3642 }
3643 } else {
3644 n->primary_opts = qdict_clone_shallow(device_opts);
3645 n->primary_opts_from_json = from_json;
3646 }
3647
3648 /* failover_primary_hidden is set during feature negotiation */
3649 return qatomic_read(&n->failover_primary_hidden);
3650 }
3651
3652 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
3653 {
3654 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
3655 VirtIONet *n = VIRTIO_NET(dev);
3656 NetClientState *nc;
3657 int i;
3658
3659 if (n->net_conf.mtu) {
3660 n->host_features |= (1ULL << VIRTIO_NET_F_MTU);
3661 }
3662
3663 if (n->net_conf.duplex_str) {
3664 if (strncmp(n->net_conf.duplex_str, "half", 5) == 0) {
3665 n->net_conf.duplex = DUPLEX_HALF;
3666 } else if (strncmp(n->net_conf.duplex_str, "full", 5) == 0) {
3667 n->net_conf.duplex = DUPLEX_FULL;
3668 } else {
3669 error_setg(errp, "'duplex' must be 'half' or 'full'");
3670 return;
3671 }
3672 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
3673 } else {
3674 n->net_conf.duplex = DUPLEX_UNKNOWN;
3675 }
3676
3677 if (n->net_conf.speed < SPEED_UNKNOWN) {
3678 error_setg(errp, "'speed' must be between 0 and INT_MAX");
3679 return;
3680 }
3681 if (n->net_conf.speed >= 0) {
3682 n->host_features |= (1ULL << VIRTIO_NET_F_SPEED_DUPLEX);
3683 }
3684
3685 if (n->failover) {
3686 n->primary_listener.hide_device = failover_hide_primary_device;
3687 qatomic_set(&n->failover_primary_hidden, true);
3688 device_listener_register(&n->primary_listener);
3689 migration_add_notifier(&n->migration_state,
3690 virtio_net_migration_state_notifier);
3691 n->host_features |= (1ULL << VIRTIO_NET_F_STANDBY);
3692 }
3693
3694 virtio_net_set_config_size(n, n->host_features);
3695 virtio_init(vdev, VIRTIO_ID_NET, n->config_size);
3696
3697 /*
3698 * We set a lower limit on RX queue size to what it always was.
3699 * Guests that want a smaller ring can always resize it without
3700 * help from us (using virtio 1 and up).
3701 */
3702 if (n->net_conf.rx_queue_size < VIRTIO_NET_RX_QUEUE_MIN_SIZE ||
3703 n->net_conf.rx_queue_size > VIRTQUEUE_MAX_SIZE ||
3704 !is_power_of_2(n->net_conf.rx_queue_size)) {
3705 error_setg(errp, "Invalid rx_queue_size (= %" PRIu16 "), "
3706 "must be a power of 2 between %d and %d.",
3707 n->net_conf.rx_queue_size, VIRTIO_NET_RX_QUEUE_MIN_SIZE,
3708 VIRTQUEUE_MAX_SIZE);
3709 virtio_cleanup(vdev);
3710 return;
3711 }
3712
3713 if (n->net_conf.tx_queue_size < VIRTIO_NET_TX_QUEUE_MIN_SIZE ||
3714 n->net_conf.tx_queue_size > virtio_net_max_tx_queue_size(n) ||
3715 !is_power_of_2(n->net_conf.tx_queue_size)) {
3716 error_setg(errp, "Invalid tx_queue_size (= %" PRIu16 "), "
3717 "must be a power of 2 between %d and %d",
3718 n->net_conf.tx_queue_size, VIRTIO_NET_TX_QUEUE_MIN_SIZE,
3719 virtio_net_max_tx_queue_size(n));
3720 virtio_cleanup(vdev);
3721 return;
3722 }
3723
3724 n->max_ncs = MAX(n->nic_conf.peers.queues, 1);
3725
3726 /*
3727 * Figure out the datapath queue pairs since the backend could
3728 * provide control queue via peers as well.
3729 */
3730 if (n->nic_conf.peers.queues) {
3731 for (i = 0; i < n->max_ncs; i++) {
3732 if (n->nic_conf.peers.ncs[i]->is_datapath) {
3733 ++n->max_queue_pairs;
3734 }
3735 }
3736 }
3737 n->max_queue_pairs = MAX(n->max_queue_pairs, 1);
3738
3739 if (n->max_queue_pairs * 2 + 1 > VIRTIO_QUEUE_MAX) {
3740 error_setg(errp, "Invalid number of queue pairs (= %" PRIu32 "), "
3741 "must be a positive integer less than %d.",
3742 n->max_queue_pairs, (VIRTIO_QUEUE_MAX - 1) / 2);
3743 virtio_cleanup(vdev);
3744 return;
3745 }
3746 n->vqs = g_new0(VirtIONetQueue, n->max_queue_pairs);
3747 n->curr_queue_pairs = 1;
3748 n->tx_timeout = n->net_conf.txtimer;
3749
3750 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
3751 && strcmp(n->net_conf.tx, "bh")) {
3752 warn_report("virtio-net: "
3753 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
3754 n->net_conf.tx);
3755 error_printf("Defaulting to \"bh\"");
3756 }
3757
3758 n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
3759 n->net_conf.tx_queue_size);
3760
3761 for (i = 0; i < n->max_queue_pairs; i++) {
3762 virtio_net_add_queue(n, i);
3763 }
3764
3765 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
3766 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
3767 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
3768 n->status = VIRTIO_NET_S_LINK_UP;
3769 qemu_announce_timer_reset(&n->announce_timer, migrate_announce_params(),
3770 QEMU_CLOCK_VIRTUAL,
3771 virtio_net_announce_timer, n);
3772 n->announce_timer.round = 0;
3773
3774 if (n->netclient_type) {
3775 /*
3776 * Happen when virtio_net_set_netclient_name has been called.
3777 */
3778 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
3779 n->netclient_type, n->netclient_name,
3780 &dev->mem_reentrancy_guard, n);
3781 } else {
3782 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
3783 object_get_typename(OBJECT(dev)), dev->id,
3784 &dev->mem_reentrancy_guard, n);
3785 }
3786
3787 for (i = 0; i < n->max_queue_pairs; i++) {
3788 n->nic->ncs[i].do_not_pad = true;
3789 }
3790
3791 peer_test_vnet_hdr(n);
3792 if (peer_has_vnet_hdr(n)) {
3793 for (i = 0; i < n->max_queue_pairs; i++) {
3794 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
3795 }
3796 n->host_hdr_len = sizeof(struct virtio_net_hdr);
3797 } else {
3798 n->host_hdr_len = 0;
3799 }
3800
3801 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
3802
3803 n->vqs[0].tx_waiting = 0;
3804 n->tx_burst = n->net_conf.txburst;
3805 virtio_net_set_mrg_rx_bufs(n, 0, 0, 0);
3806 n->promisc = 1; /* for compatibility */
3807
3808 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
3809
3810 n->vlans = g_malloc0(MAX_VLAN >> 3);
3811
3812 nc = qemu_get_queue(n->nic);
3813 nc->rxfilter_notify_enabled = 1;
3814
3815 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
3816 struct virtio_net_config netcfg = {};
3817 memcpy(&netcfg.mac, &n->nic_conf.macaddr, ETH_ALEN);
3818 vhost_net_set_config(get_vhost_net(nc->peer),
3819 (uint8_t *)&netcfg, 0, ETH_ALEN, VHOST_SET_CONFIG_TYPE_FRONTEND);
3820 }
3821 QTAILQ_INIT(&n->rsc_chains);
3822 n->qdev = dev;
3823
3824 net_rx_pkt_init(&n->rx_pkt);
3825
3826 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
3827 virtio_net_load_ebpf(n, errp);
3828 }
3829 }
3830
3831 static void virtio_net_device_unrealize(DeviceState *dev)
3832 {
3833 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
3834 VirtIONet *n = VIRTIO_NET(dev);
3835 int i, max_queue_pairs;
3836
3837 if (virtio_has_feature(n->host_features, VIRTIO_NET_F_RSS)) {
3838 virtio_net_unload_ebpf(n);
3839 }
3840
3841 /* This will stop vhost backend if appropriate. */
3842 virtio_net_set_status(vdev, 0);
3843
3844 g_free(n->netclient_name);
3845 n->netclient_name = NULL;
3846 g_free(n->netclient_type);
3847 n->netclient_type = NULL;
3848
3849 g_free(n->mac_table.macs);
3850 g_free(n->vlans);
3851
3852 if (n->failover) {
3853 qobject_unref(n->primary_opts);
3854 device_listener_unregister(&n->primary_listener);
3855 migration_remove_notifier(&n->migration_state);
3856 } else {
3857 assert(n->primary_opts == NULL);
3858 }
3859
3860 max_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1;
3861 for (i = 0; i < max_queue_pairs; i++) {
3862 virtio_net_del_queue(n, i);
3863 }
3864 /* delete also control vq */
3865 virtio_del_queue(vdev, max_queue_pairs * 2);
3866 qemu_announce_timer_del(&n->announce_timer, false);
3867 g_free(n->vqs);
3868 qemu_del_nic(n->nic);
3869 virtio_net_rsc_cleanup(n);
3870 g_free(n->rss_data.indirections_table);
3871 net_rx_pkt_uninit(n->rx_pkt);
3872 virtio_cleanup(vdev);
3873 }
3874
3875 static void virtio_net_instance_init(Object *obj)
3876 {
3877 VirtIONet *n = VIRTIO_NET(obj);
3878
3879 /*
3880 * The default config_size is sizeof(struct virtio_net_config).
3881 * Can be overridden with virtio_net_set_config_size.
3882 */
3883 n->config_size = sizeof(struct virtio_net_config);
3884 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
3885 "bootindex", "/ethernet-phy@0",
3886 DEVICE(n));
3887
3888 ebpf_rss_init(&n->ebpf_rss);
3889 }
3890
3891 static int virtio_net_pre_save(void *opaque)
3892 {
3893 VirtIONet *n = opaque;
3894
3895 /* At this point, backend must be stopped, otherwise
3896 * it might keep writing to memory. */
3897 assert(!n->vhost_started);
3898
3899 return 0;
3900 }
3901
3902 static bool primary_unplug_pending(void *opaque)
3903 {
3904 DeviceState *dev = opaque;
3905 DeviceState *primary;
3906 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
3907 VirtIONet *n = VIRTIO_NET(vdev);
3908
3909 if (!virtio_vdev_has_feature(vdev, VIRTIO_NET_F_STANDBY)) {
3910 return false;
3911 }
3912 primary = failover_find_primary_device(n);
3913 return primary ? primary->pending_deleted_event : false;
3914 }
3915
3916 static bool dev_unplug_pending(void *opaque)
3917 {
3918 DeviceState *dev = opaque;
3919 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
3920
3921 return vdc->primary_unplug_pending(dev);
3922 }
3923
3924 static struct vhost_dev *virtio_net_get_vhost(VirtIODevice *vdev)
3925 {
3926 VirtIONet *n = VIRTIO_NET(vdev);
3927 NetClientState *nc = qemu_get_queue(n->nic);
3928 struct vhost_net *net = get_vhost_net(nc->peer);
3929 return &net->dev;
3930 }
3931
3932 static const VMStateDescription vmstate_virtio_net = {
3933 .name = "virtio-net",
3934 .minimum_version_id = VIRTIO_NET_VM_VERSION,
3935 .version_id = VIRTIO_NET_VM_VERSION,
3936 .fields = (const VMStateField[]) {
3937 VMSTATE_VIRTIO_DEVICE,
3938 VMSTATE_END_OF_LIST()
3939 },
3940 .pre_save = virtio_net_pre_save,
3941 .dev_unplug_pending = dev_unplug_pending,
3942 };
3943
3944 static Property virtio_net_properties[] = {
3945 DEFINE_PROP_BIT64("csum", VirtIONet, host_features,
3946 VIRTIO_NET_F_CSUM, true),
3947 DEFINE_PROP_BIT64("guest_csum", VirtIONet, host_features,
3948 VIRTIO_NET_F_GUEST_CSUM, true),
3949 DEFINE_PROP_BIT64("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
3950 DEFINE_PROP_BIT64("guest_tso4", VirtIONet, host_features,
3951 VIRTIO_NET_F_GUEST_TSO4, true),
3952 DEFINE_PROP_BIT64("guest_tso6", VirtIONet, host_features,
3953 VIRTIO_NET_F_GUEST_TSO6, true),
3954 DEFINE_PROP_BIT64("guest_ecn", VirtIONet, host_features,
3955 VIRTIO_NET_F_GUEST_ECN, true),
3956 DEFINE_PROP_BIT64("guest_ufo", VirtIONet, host_features,
3957 VIRTIO_NET_F_GUEST_UFO, true),
3958 DEFINE_PROP_BIT64("guest_announce", VirtIONet, host_features,
3959 VIRTIO_NET_F_GUEST_ANNOUNCE, true),
3960 DEFINE_PROP_BIT64("host_tso4", VirtIONet, host_features,
3961 VIRTIO_NET_F_HOST_TSO4, true),
3962 DEFINE_PROP_BIT64("host_tso6", VirtIONet, host_features,
3963 VIRTIO_NET_F_HOST_TSO6, true),
3964 DEFINE_PROP_BIT64("host_ecn", VirtIONet, host_features,
3965 VIRTIO_NET_F_HOST_ECN, true),
3966 DEFINE_PROP_BIT64("host_ufo", VirtIONet, host_features,
3967 VIRTIO_NET_F_HOST_UFO, true),
3968 DEFINE_PROP_BIT64("mrg_rxbuf", VirtIONet, host_features,
3969 VIRTIO_NET_F_MRG_RXBUF, true),
3970 DEFINE_PROP_BIT64("status", VirtIONet, host_features,
3971 VIRTIO_NET_F_STATUS, true),
3972 DEFINE_PROP_BIT64("ctrl_vq", VirtIONet, host_features,
3973 VIRTIO_NET_F_CTRL_VQ, true),
3974 DEFINE_PROP_BIT64("ctrl_rx", VirtIONet, host_features,
3975 VIRTIO_NET_F_CTRL_RX, true),
3976 DEFINE_PROP_BIT64("ctrl_vlan", VirtIONet, host_features,
3977 VIRTIO_NET_F_CTRL_VLAN, true),
3978 DEFINE_PROP_BIT64("ctrl_rx_extra", VirtIONet, host_features,
3979 VIRTIO_NET_F_CTRL_RX_EXTRA, true),
3980 DEFINE_PROP_BIT64("ctrl_mac_addr", VirtIONet, host_features,
3981 VIRTIO_NET_F_CTRL_MAC_ADDR, true),
3982 DEFINE_PROP_BIT64("ctrl_guest_offloads", VirtIONet, host_features,
3983 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
3984 DEFINE_PROP_BIT64("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
3985 DEFINE_PROP_BIT64("rss", VirtIONet, host_features,
3986 VIRTIO_NET_F_RSS, false),
3987 DEFINE_PROP_BIT64("hash", VirtIONet, host_features,
3988 VIRTIO_NET_F_HASH_REPORT, false),
3989 DEFINE_PROP_ARRAY("ebpf-rss-fds", VirtIONet, nr_ebpf_rss_fds,
3990 ebpf_rss_fds, qdev_prop_string, char*),
3991 DEFINE_PROP_BIT64("guest_rsc_ext", VirtIONet, host_features,
3992 VIRTIO_NET_F_RSC_EXT, false),
3993 DEFINE_PROP_UINT32("rsc_interval", VirtIONet, rsc_timeout,
3994 VIRTIO_NET_RSC_DEFAULT_INTERVAL),
3995 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
3996 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
3997 TX_TIMER_INTERVAL),
3998 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
3999 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
4000 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet, net_conf.rx_queue_size,
4001 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE),
4002 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet, net_conf.tx_queue_size,
4003 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE),
4004 DEFINE_PROP_UINT16("host_mtu", VirtIONet, net_conf.mtu, 0),
4005 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet, mtu_bypass_backend,
4006 true),
4007 DEFINE_PROP_INT32("speed", VirtIONet, net_conf.speed, SPEED_UNKNOWN),
4008 DEFINE_PROP_STRING("duplex", VirtIONet, net_conf.duplex_str),
4009 DEFINE_PROP_BOOL("failover", VirtIONet, failover, false),
4010 DEFINE_PROP_BIT64("guest_uso4", VirtIONet, host_features,
4011 VIRTIO_NET_F_GUEST_USO4, true),
4012 DEFINE_PROP_BIT64("guest_uso6", VirtIONet, host_features,
4013 VIRTIO_NET_F_GUEST_USO6, true),
4014 DEFINE_PROP_BIT64("host_uso", VirtIONet, host_features,
4015 VIRTIO_NET_F_HOST_USO, true),
4016 DEFINE_PROP_END_OF_LIST(),
4017 };
4018
4019 static void virtio_net_class_init(ObjectClass *klass, void *data)
4020 {
4021 DeviceClass *dc = DEVICE_CLASS(klass);
4022 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
4023
4024 device_class_set_props(dc, virtio_net_properties);
4025 dc->vmsd = &vmstate_virtio_net;
4026 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
4027 vdc->realize = virtio_net_device_realize;
4028 vdc->unrealize = virtio_net_device_unrealize;
4029 vdc->get_config = virtio_net_get_config;
4030 vdc->set_config = virtio_net_set_config;
4031 vdc->get_features = virtio_net_get_features;
4032 vdc->set_features = virtio_net_set_features;
4033 vdc->bad_features = virtio_net_bad_features;
4034 vdc->reset = virtio_net_reset;
4035 vdc->queue_reset = virtio_net_queue_reset;
4036 vdc->queue_enable = virtio_net_queue_enable;
4037 vdc->set_status = virtio_net_set_status;
4038 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
4039 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
4040 vdc->legacy_features |= (0x1 << VIRTIO_NET_F_GSO);
4041 vdc->post_load = virtio_net_post_load_virtio;
4042 vdc->vmsd = &vmstate_virtio_net_device;
4043 vdc->primary_unplug_pending = primary_unplug_pending;
4044 vdc->get_vhost = virtio_net_get_vhost;
4045 vdc->toggle_device_iotlb = vhost_toggle_device_iotlb;
4046 }
4047
4048 static const TypeInfo virtio_net_info = {
4049 .name = TYPE_VIRTIO_NET,
4050 .parent = TYPE_VIRTIO_DEVICE,
4051 .instance_size = sizeof(VirtIONet),
4052 .instance_init = virtio_net_instance_init,
4053 .class_init = virtio_net_class_init,
4054 };
4055
4056 static void virtio_register_types(void)
4057 {
4058 type_register_static(&virtio_net_info);
4059 }
4060
4061 type_init(virtio_register_types)
armbru's QEMU hackery