2 * Virtio Network Device
4 * Copyright IBM, Corp. 2007
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
15 #include "hw/virtio/virtio.h"
17 #include "net/checksum.h"
19 #include "qemu/error-report.h"
20 #include "qemu/timer.h"
21 #include "hw/virtio/virtio-net.h"
22 #include "net/vhost_net.h"
23 #include "hw/virtio/virtio-bus.h"
24 #include "qapi/qmp/qjson.h"
25 #include "qapi-event.h"
26 #include "hw/virtio/virtio-access.h"
28 #define VIRTIO_NET_VM_VERSION 11
30 #define MAC_TABLE_ENTRIES 64
31 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
34 * Calculate the number of bytes up to and including the given 'field' of
37 #define endof(container, field) \
38 (offsetof(container, field) + sizeof(((container *)0)->field))
40 typedef struct VirtIOFeature {
45 static VirtIOFeature feature_sizes[] = {
46 {.flags = 1 << VIRTIO_NET_F_MAC,
47 .end = endof(struct virtio_net_config, mac)},
48 {.flags = 1 << VIRTIO_NET_F_STATUS,
49 .end = endof(struct virtio_net_config, status)},
50 {.flags = 1 << VIRTIO_NET_F_MQ,
51 .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
55 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
57 VirtIONet *n = qemu_get_nic_opaque(nc);
59 return &n->vqs[nc->queue_index];
62 static int vq2q(int queue_index)
64 return queue_index / 2;
68 * - we could suppress RX interrupt if we were so inclined.
71 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
73 VirtIONet *n = VIRTIO_NET(vdev);
74 struct virtio_net_config netcfg;
76 virtio_stw_p(vdev, &netcfg.status, n->status);
77 virtio_stw_p(vdev, &netcfg.max_virtqueue_pairs, n->max_queues);
78 memcpy(netcfg.mac, n->mac, ETH_ALEN);
79 memcpy(config, &netcfg, n->config_size);
82 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
84 VirtIONet *n = VIRTIO_NET(vdev);
85 struct virtio_net_config netcfg = {};
87 memcpy(&netcfg, config, n->config_size);
89 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR) &&
90 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
91 memcpy(n->mac, netcfg.mac, ETH_ALEN);
92 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
96 static bool virtio_net_started(VirtIONet *n, uint8_t status)
98 VirtIODevice *vdev = VIRTIO_DEVICE(n);
99 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
100 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
103 static void virtio_net_announce_timer(void *opaque)
105 VirtIONet *n = opaque;
106 VirtIODevice *vdev = VIRTIO_DEVICE(n);
108 n->announce_counter--;
109 n->status |= VIRTIO_NET_S_ANNOUNCE;
110 virtio_notify_config(vdev);
113 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
115 VirtIODevice *vdev = VIRTIO_DEVICE(n);
116 NetClientState *nc = qemu_get_queue(n->nic);
117 int queues = n->multiqueue ? n->max_queues : 1;
119 if (!get_vhost_net(nc->peer)) {
123 if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
124 !!n->vhost_started) {
127 if (!n->vhost_started) {
130 if (!vhost_net_query(get_vhost_net(nc->peer), vdev)) {
134 /* Any packets outstanding? Purge them to avoid touching rings
135 * when vhost is running.
137 for (i = 0; i < queues; i++) {
138 NetClientState *qnc = qemu_get_subqueue(n->nic, i);
140 /* Purge both directions: TX and RX. */
141 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
142 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
145 n->vhost_started = 1;
146 r = vhost_net_start(vdev, n->nic->ncs, queues);
148 error_report("unable to start vhost net: %d: "
149 "falling back on userspace virtio", -r);
150 n->vhost_started = 0;
153 vhost_net_stop(vdev, n->nic->ncs, queues);
154 n->vhost_started = 0;
158 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
160 VirtIONet *n = VIRTIO_NET(vdev);
163 uint8_t queue_status;
165 virtio_net_vhost_status(n, status);
167 for (i = 0; i < n->max_queues; i++) {
170 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
173 queue_status = status;
176 if (!q->tx_waiting) {
180 if (virtio_net_started(n, queue_status) && !n->vhost_started) {
182 timer_mod(q->tx_timer,
183 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
185 qemu_bh_schedule(q->tx_bh);
189 timer_del(q->tx_timer);
191 qemu_bh_cancel(q->tx_bh);
197 static void virtio_net_set_link_status(NetClientState *nc)
199 VirtIONet *n = qemu_get_nic_opaque(nc);
200 VirtIODevice *vdev = VIRTIO_DEVICE(n);
201 uint16_t old_status = n->status;
204 n->status &= ~VIRTIO_NET_S_LINK_UP;
206 n->status |= VIRTIO_NET_S_LINK_UP;
208 if (n->status != old_status)
209 virtio_notify_config(vdev);
211 virtio_net_set_status(vdev, vdev->status);
214 static void rxfilter_notify(NetClientState *nc)
216 VirtIONet *n = qemu_get_nic_opaque(nc);
218 if (nc->rxfilter_notify_enabled) {
219 gchar *path = object_get_canonical_path(OBJECT(n->qdev));
220 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
221 n->netclient_name, path, &error_abort);
224 /* disable event notification to avoid events flooding */
225 nc->rxfilter_notify_enabled = 0;
229 static char *mac_strdup_printf(const uint8_t *mac)
231 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0],
232 mac[1], mac[2], mac[3], mac[4], mac[5]);
235 static intList *get_vlan_table(VirtIONet *n)
237 intList *list, *entry;
241 for (i = 0; i < MAX_VLAN >> 5; i++) {
242 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
243 if (n->vlans[i] & (1U << j)) {
244 entry = g_malloc0(sizeof(*entry));
245 entry->value = (i << 5) + j;
255 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
257 VirtIONet *n = qemu_get_nic_opaque(nc);
258 VirtIODevice *vdev = VIRTIO_DEVICE(n);
260 strList *str_list, *entry;
263 info = g_malloc0(sizeof(*info));
264 info->name = g_strdup(nc->name);
265 info->promiscuous = n->promisc;
268 info->unicast = RX_STATE_NONE;
269 } else if (n->alluni) {
270 info->unicast = RX_STATE_ALL;
272 info->unicast = RX_STATE_NORMAL;
276 info->multicast = RX_STATE_NONE;
277 } else if (n->allmulti) {
278 info->multicast = RX_STATE_ALL;
280 info->multicast = RX_STATE_NORMAL;
283 info->broadcast_allowed = n->nobcast;
284 info->multicast_overflow = n->mac_table.multi_overflow;
285 info->unicast_overflow = n->mac_table.uni_overflow;
287 info->main_mac = mac_strdup_printf(n->mac);
290 for (i = 0; i < n->mac_table.first_multi; i++) {
291 entry = g_malloc0(sizeof(*entry));
292 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
293 entry->next = str_list;
296 info->unicast_table = str_list;
299 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
300 entry = g_malloc0(sizeof(*entry));
301 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
302 entry->next = str_list;
305 info->multicast_table = str_list;
306 info->vlan_table = get_vlan_table(n);
308 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
309 info->vlan = RX_STATE_ALL;
310 } else if (!info->vlan_table) {
311 info->vlan = RX_STATE_NONE;
313 info->vlan = RX_STATE_NORMAL;
316 /* enable event notification after query */
317 nc->rxfilter_notify_enabled = 1;
322 static void virtio_net_reset(VirtIODevice *vdev)
324 VirtIONet *n = VIRTIO_NET(vdev);
326 /* Reset back to compatibility mode */
333 /* multiqueue is disabled by default */
335 timer_del(n->announce_timer);
336 n->announce_counter = 0;
337 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
339 /* Flush any MAC and VLAN filter table state */
340 n->mac_table.in_use = 0;
341 n->mac_table.first_multi = 0;
342 n->mac_table.multi_overflow = 0;
343 n->mac_table.uni_overflow = 0;
344 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
345 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
346 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
347 memset(n->vlans, 0, MAX_VLAN >> 3);
350 static void peer_test_vnet_hdr(VirtIONet *n)
352 NetClientState *nc = qemu_get_queue(n->nic);
357 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
360 static int peer_has_vnet_hdr(VirtIONet *n)
362 return n->has_vnet_hdr;
365 static int peer_has_ufo(VirtIONet *n)
367 if (!peer_has_vnet_hdr(n))
370 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
375 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs)
380 n->mergeable_rx_bufs = mergeable_rx_bufs;
382 n->guest_hdr_len = n->mergeable_rx_bufs ?
383 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
385 for (i = 0; i < n->max_queues; i++) {
386 nc = qemu_get_subqueue(n->nic, i);
388 if (peer_has_vnet_hdr(n) &&
389 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
390 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
391 n->host_hdr_len = n->guest_hdr_len;
396 static int peer_attach(VirtIONet *n, int index)
398 NetClientState *nc = qemu_get_subqueue(n->nic, index);
404 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
408 return tap_enable(nc->peer);
411 static int peer_detach(VirtIONet *n, int index)
413 NetClientState *nc = qemu_get_subqueue(n->nic, index);
419 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
423 return tap_disable(nc->peer);
426 static void virtio_net_set_queues(VirtIONet *n)
431 for (i = 0; i < n->max_queues; i++) {
432 if (i < n->curr_queues) {
433 r = peer_attach(n, i);
436 r = peer_detach(n, i);
442 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
444 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
446 VirtIONet *n = VIRTIO_NET(vdev);
447 NetClientState *nc = qemu_get_queue(n->nic);
449 /* Firstly sync all virtio-net possible supported features */
450 features |= n->host_features;
452 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
454 if (!peer_has_vnet_hdr(n)) {
455 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
456 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
457 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
458 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
460 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
461 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
462 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
463 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
466 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
467 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
468 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
471 if (!get_vhost_net(nc->peer)) {
474 return vhost_net_get_features(get_vhost_net(nc->peer), features);
477 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
479 uint32_t features = 0;
481 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
483 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
484 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
485 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
486 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
487 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
492 static void virtio_net_apply_guest_offloads(VirtIONet *n)
494 qemu_set_offload(qemu_get_queue(n->nic)->peer,
495 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
496 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
497 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
498 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
499 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
502 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
504 static const uint64_t guest_offloads_mask =
505 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
506 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
507 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
508 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
509 (1ULL << VIRTIO_NET_F_GUEST_UFO);
511 return guest_offloads_mask & features;
514 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
516 VirtIODevice *vdev = VIRTIO_DEVICE(n);
517 return virtio_net_guest_offloads_by_features(vdev->guest_features);
520 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
522 VirtIONet *n = VIRTIO_NET(vdev);
525 virtio_net_set_multiqueue(n,
526 __virtio_has_feature(features, VIRTIO_NET_F_MQ));
528 virtio_net_set_mrg_rx_bufs(n,
529 __virtio_has_feature(features,
530 VIRTIO_NET_F_MRG_RXBUF));
532 if (n->has_vnet_hdr) {
533 n->curr_guest_offloads =
534 virtio_net_guest_offloads_by_features(features);
535 virtio_net_apply_guest_offloads(n);
538 for (i = 0; i < n->max_queues; i++) {
539 NetClientState *nc = qemu_get_subqueue(n->nic, i);
541 if (!get_vhost_net(nc->peer)) {
544 vhost_net_ack_features(get_vhost_net(nc->peer), features);
547 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
548 memset(n->vlans, 0, MAX_VLAN >> 3);
550 memset(n->vlans, 0xff, MAX_VLAN >> 3);
554 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
555 struct iovec *iov, unsigned int iov_cnt)
559 NetClientState *nc = qemu_get_queue(n->nic);
561 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
562 if (s != sizeof(on)) {
563 return VIRTIO_NET_ERR;
566 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
568 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
570 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
572 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
574 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
576 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
579 return VIRTIO_NET_ERR;
584 return VIRTIO_NET_OK;
587 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
588 struct iovec *iov, unsigned int iov_cnt)
590 VirtIODevice *vdev = VIRTIO_DEVICE(n);
594 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
595 return VIRTIO_NET_ERR;
598 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
599 if (s != sizeof(offloads)) {
600 return VIRTIO_NET_ERR;
603 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
604 uint64_t supported_offloads;
606 if (!n->has_vnet_hdr) {
607 return VIRTIO_NET_ERR;
610 supported_offloads = virtio_net_supported_guest_offloads(n);
611 if (offloads & ~supported_offloads) {
612 return VIRTIO_NET_ERR;
615 n->curr_guest_offloads = offloads;
616 virtio_net_apply_guest_offloads(n);
618 return VIRTIO_NET_OK;
620 return VIRTIO_NET_ERR;
624 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
625 struct iovec *iov, unsigned int iov_cnt)
627 VirtIODevice *vdev = VIRTIO_DEVICE(n);
628 struct virtio_net_ctrl_mac mac_data;
630 NetClientState *nc = qemu_get_queue(n->nic);
632 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
633 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
634 return VIRTIO_NET_ERR;
636 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
637 assert(s == sizeof(n->mac));
638 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
641 return VIRTIO_NET_OK;
644 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
645 return VIRTIO_NET_ERR;
650 uint8_t uni_overflow = 0;
651 uint8_t multi_overflow = 0;
652 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
654 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
655 sizeof(mac_data.entries));
656 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
657 if (s != sizeof(mac_data.entries)) {
660 iov_discard_front(&iov, &iov_cnt, s);
662 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
666 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
667 s = iov_to_buf(iov, iov_cnt, 0, macs,
668 mac_data.entries * ETH_ALEN);
669 if (s != mac_data.entries * ETH_ALEN) {
672 in_use += mac_data.entries;
677 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
679 first_multi = in_use;
681 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
682 sizeof(mac_data.entries));
683 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
684 if (s != sizeof(mac_data.entries)) {
688 iov_discard_front(&iov, &iov_cnt, s);
690 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
694 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
695 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
696 mac_data.entries * ETH_ALEN);
697 if (s != mac_data.entries * ETH_ALEN) {
700 in_use += mac_data.entries;
705 n->mac_table.in_use = in_use;
706 n->mac_table.first_multi = first_multi;
707 n->mac_table.uni_overflow = uni_overflow;
708 n->mac_table.multi_overflow = multi_overflow;
709 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
713 return VIRTIO_NET_OK;
717 return VIRTIO_NET_ERR;
720 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
721 struct iovec *iov, unsigned int iov_cnt)
723 VirtIODevice *vdev = VIRTIO_DEVICE(n);
726 NetClientState *nc = qemu_get_queue(n->nic);
728 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
729 vid = virtio_lduw_p(vdev, &vid);
730 if (s != sizeof(vid)) {
731 return VIRTIO_NET_ERR;
735 return VIRTIO_NET_ERR;
737 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
738 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
739 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
740 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
742 return VIRTIO_NET_ERR;
746 return VIRTIO_NET_OK;
749 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
750 struct iovec *iov, unsigned int iov_cnt)
752 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
753 n->status & VIRTIO_NET_S_ANNOUNCE) {
754 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
755 if (n->announce_counter) {
756 timer_mod(n->announce_timer,
757 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
758 self_announce_delay(n->announce_counter));
760 return VIRTIO_NET_OK;
762 return VIRTIO_NET_ERR;
766 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
767 struct iovec *iov, unsigned int iov_cnt)
769 VirtIODevice *vdev = VIRTIO_DEVICE(n);
770 struct virtio_net_ctrl_mq mq;
774 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
775 if (s != sizeof(mq)) {
776 return VIRTIO_NET_ERR;
779 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
780 return VIRTIO_NET_ERR;
783 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
785 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
786 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
787 queues > n->max_queues ||
789 return VIRTIO_NET_ERR;
792 n->curr_queues = queues;
793 /* stop the backend before changing the number of queues to avoid handling a
795 virtio_net_set_status(vdev, vdev->status);
796 virtio_net_set_queues(n);
798 return VIRTIO_NET_OK;
800 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
802 VirtIONet *n = VIRTIO_NET(vdev);
803 struct virtio_net_ctrl_hdr ctrl;
804 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
805 VirtQueueElement elem;
807 struct iovec *iov, *iov2;
808 unsigned int iov_cnt;
810 while (virtqueue_pop(vq, &elem)) {
811 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) ||
812 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
813 error_report("virtio-net ctrl missing headers");
817 iov_cnt = elem.out_num;
818 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num);
819 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
820 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
821 if (s != sizeof(ctrl)) {
822 status = VIRTIO_NET_ERR;
823 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
824 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
825 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
826 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
827 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
828 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
829 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
830 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
831 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
832 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
833 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
834 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
837 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
838 assert(s == sizeof(status));
840 virtqueue_push(vq, &elem, sizeof(status));
841 virtio_notify(vdev, vq);
848 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
850 VirtIONet *n = VIRTIO_NET(vdev);
851 int queue_index = vq2q(virtio_get_queue_index(vq));
853 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
856 static int virtio_net_can_receive(NetClientState *nc)
858 VirtIONet *n = qemu_get_nic_opaque(nc);
859 VirtIODevice *vdev = VIRTIO_DEVICE(n);
860 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
862 if (!vdev->vm_running) {
866 if (nc->queue_index >= n->curr_queues) {
870 if (!virtio_queue_ready(q->rx_vq) ||
871 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
878 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
881 if (virtio_queue_empty(q->rx_vq) ||
882 (n->mergeable_rx_bufs &&
883 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
884 virtio_queue_set_notification(q->rx_vq, 1);
886 /* To avoid a race condition where the guest has made some buffers
887 * available after the above check but before notification was
888 * enabled, check for available buffers again.
890 if (virtio_queue_empty(q->rx_vq) ||
891 (n->mergeable_rx_bufs &&
892 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
897 virtio_queue_set_notification(q->rx_vq, 0);
901 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
903 virtio_tswap16s(vdev, &hdr->hdr_len);
904 virtio_tswap16s(vdev, &hdr->gso_size);
905 virtio_tswap16s(vdev, &hdr->csum_start);
906 virtio_tswap16s(vdev, &hdr->csum_offset);
909 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
910 * it never finds out that the packets don't have valid checksums. This
911 * causes dhclient to get upset. Fedora's carried a patch for ages to
912 * fix this with Xen but it hasn't appeared in an upstream release of
915 * To avoid breaking existing guests, we catch udp packets and add
916 * checksums. This is terrible but it's better than hacking the guest
919 * N.B. if we introduce a zero-copy API, this operation is no longer free so
920 * we should provide a mechanism to disable it to avoid polluting the host
923 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
924 uint8_t *buf, size_t size)
926 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
927 (size > 27 && size < 1500) && /* normal sized MTU */
928 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
929 (buf[23] == 17) && /* ip.protocol == UDP */
930 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
931 net_checksum_calculate(buf, size);
932 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
936 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
937 const void *buf, size_t size)
939 if (n->has_vnet_hdr) {
940 /* FIXME this cast is evil */
941 void *wbuf = (void *)buf;
942 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
943 size - n->host_hdr_len);
944 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
945 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
947 struct virtio_net_hdr hdr = {
949 .gso_type = VIRTIO_NET_HDR_GSO_NONE
951 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
955 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
957 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
958 static const uint8_t vlan[] = {0x81, 0x00};
959 uint8_t *ptr = (uint8_t *)buf;
965 ptr += n->host_hdr_len;
967 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
968 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
969 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
973 if (ptr[0] & 1) { // multicast
974 if (!memcmp(ptr, bcast, sizeof(bcast))) {
976 } else if (n->nomulti) {
978 } else if (n->allmulti || n->mac_table.multi_overflow) {
982 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
983 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
990 } else if (n->alluni || n->mac_table.uni_overflow) {
992 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
996 for (i = 0; i < n->mac_table.first_multi; i++) {
997 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1006 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
1008 VirtIONet *n = qemu_get_nic_opaque(nc);
1009 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1010 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1011 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1012 struct virtio_net_hdr_mrg_rxbuf mhdr;
1013 unsigned mhdr_cnt = 0;
1014 size_t offset, i, guest_offset;
1016 if (!virtio_net_can_receive(nc)) {
1020 /* hdr_len refers to the header we supply to the guest */
1021 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1025 if (!receive_filter(n, buf, size))
1030 while (offset < size) {
1031 VirtQueueElement elem;
1033 const struct iovec *sg = elem.in_sg;
1037 if (virtqueue_pop(q->rx_vq, &elem) == 0) {
1040 error_report("virtio-net unexpected empty queue: "
1041 "i %zd mergeable %d offset %zd, size %zd, "
1042 "guest hdr len %zd, host hdr len %zd guest features 0x%x",
1043 i, n->mergeable_rx_bufs, offset, size,
1044 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features);
1048 if (elem.in_num < 1) {
1049 error_report("virtio-net receive queue contains no in buffers");
1054 assert(offset == 0);
1055 if (n->mergeable_rx_bufs) {
1056 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1058 offsetof(typeof(mhdr), num_buffers),
1059 sizeof(mhdr.num_buffers));
1062 receive_header(n, sg, elem.in_num, buf, size);
1063 offset = n->host_hdr_len;
1064 total += n->guest_hdr_len;
1065 guest_offset = n->guest_hdr_len;
1070 /* copy in packet. ugh */
1071 len = iov_from_buf(sg, elem.in_num, guest_offset,
1072 buf + offset, size - offset);
1075 /* If buffers can't be merged, at this point we
1076 * must have consumed the complete packet.
1077 * Otherwise, drop it. */
1078 if (!n->mergeable_rx_bufs && offset < size) {
1080 error_report("virtio-net truncated non-mergeable packet: "
1081 "i %zd mergeable %d offset %zd, size %zd, "
1082 "guest hdr len %zd, host hdr len %zd",
1083 i, n->mergeable_rx_bufs,
1084 offset, size, n->guest_hdr_len, n->host_hdr_len);
1089 /* signal other side */
1090 virtqueue_fill(q->rx_vq, &elem, total, i++);
1094 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1095 iov_from_buf(mhdr_sg, mhdr_cnt,
1097 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1100 virtqueue_flush(q->rx_vq, i);
1101 virtio_notify(vdev, q->rx_vq);
1106 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1108 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1110 VirtIONet *n = qemu_get_nic_opaque(nc);
1111 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1112 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1114 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
1115 virtio_notify(vdev, q->tx_vq);
1117 q->async_tx.elem.out_num = q->async_tx.len = 0;
1119 virtio_queue_set_notification(q->tx_vq, 1);
1120 virtio_net_flush_tx(q);
1124 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1126 VirtIONet *n = q->n;
1127 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1128 VirtQueueElement elem;
1129 int32_t num_packets = 0;
1130 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1131 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1135 if (q->async_tx.elem.out_num) {
1136 virtio_queue_set_notification(q->tx_vq, 0);
1140 while (virtqueue_pop(q->tx_vq, &elem)) {
1142 unsigned int out_num = elem.out_num;
1143 struct iovec *out_sg = &elem.out_sg[0];
1144 struct iovec sg[VIRTQUEUE_MAX_SIZE];
1147 error_report("virtio-net header not in first element");
1151 if (n->has_vnet_hdr) {
1152 if (out_sg[0].iov_len < n->guest_hdr_len) {
1153 error_report("virtio-net header incorrect");
1156 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base);
1160 * If host wants to see the guest header as is, we can
1161 * pass it on unchanged. Otherwise, copy just the parts
1162 * that host is interested in.
1164 assert(n->host_hdr_len <= n->guest_hdr_len);
1165 if (n->host_hdr_len != n->guest_hdr_len) {
1166 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1168 0, n->host_hdr_len);
1169 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1171 n->guest_hdr_len, -1);
1176 len = n->guest_hdr_len;
1178 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1179 out_sg, out_num, virtio_net_tx_complete);
1181 virtio_queue_set_notification(q->tx_vq, 0);
1182 q->async_tx.elem = elem;
1183 q->async_tx.len = len;
1189 virtqueue_push(q->tx_vq, &elem, 0);
1190 virtio_notify(vdev, q->tx_vq);
1192 if (++num_packets >= n->tx_burst) {
1199 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1201 VirtIONet *n = VIRTIO_NET(vdev);
1202 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1204 /* This happens when device was stopped but VCPU wasn't. */
1205 if (!vdev->vm_running) {
1210 if (q->tx_waiting) {
1211 virtio_queue_set_notification(vq, 1);
1212 timer_del(q->tx_timer);
1214 virtio_net_flush_tx(q);
1216 timer_mod(q->tx_timer,
1217 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1219 virtio_queue_set_notification(vq, 0);
1223 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1225 VirtIONet *n = VIRTIO_NET(vdev);
1226 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1228 if (unlikely(q->tx_waiting)) {
1232 /* This happens when device was stopped but VCPU wasn't. */
1233 if (!vdev->vm_running) {
1236 virtio_queue_set_notification(vq, 0);
1237 qemu_bh_schedule(q->tx_bh);
1240 static void virtio_net_tx_timer(void *opaque)
1242 VirtIONetQueue *q = opaque;
1243 VirtIONet *n = q->n;
1244 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1245 /* This happens when device was stopped but BH wasn't. */
1246 if (!vdev->vm_running) {
1247 /* Make sure tx waiting is set, so we'll run when restarted. */
1248 assert(q->tx_waiting);
1254 /* Just in case the driver is not ready on more */
1255 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1259 virtio_queue_set_notification(q->tx_vq, 1);
1260 virtio_net_flush_tx(q);
1263 static void virtio_net_tx_bh(void *opaque)
1265 VirtIONetQueue *q = opaque;
1266 VirtIONet *n = q->n;
1267 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1270 /* This happens when device was stopped but BH wasn't. */
1271 if (!vdev->vm_running) {
1272 /* Make sure tx waiting is set, so we'll run when restarted. */
1273 assert(q->tx_waiting);
1279 /* Just in case the driver is not ready on more */
1280 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1284 ret = virtio_net_flush_tx(q);
1285 if (ret == -EBUSY) {
1286 return; /* Notification re-enable handled by tx_complete */
1289 /* If we flush a full burst of packets, assume there are
1290 * more coming and immediately reschedule */
1291 if (ret >= n->tx_burst) {
1292 qemu_bh_schedule(q->tx_bh);
1297 /* If less than a full burst, re-enable notification and flush
1298 * anything that may have come in while we weren't looking. If
1299 * we find something, assume the guest is still active and reschedule */
1300 virtio_queue_set_notification(q->tx_vq, 1);
1301 if (virtio_net_flush_tx(q) > 0) {
1302 virtio_queue_set_notification(q->tx_vq, 0);
1303 qemu_bh_schedule(q->tx_bh);
1308 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1310 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1311 int i, max = multiqueue ? n->max_queues : 1;
1313 n->multiqueue = multiqueue;
1315 for (i = 2; i < n->max_queues * 2 + 1; i++) {
1316 virtio_del_queue(vdev, i);
1319 for (i = 1; i < max; i++) {
1320 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1321 if (n->vqs[i].tx_timer) {
1323 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
1324 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1325 virtio_net_tx_timer,
1329 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
1330 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]);
1333 n->vqs[i].tx_waiting = 0;
1337 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack
1338 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid
1341 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1343 virtio_net_set_queues(n);
1346 static void virtio_net_save(QEMUFile *f, void *opaque)
1348 VirtIONet *n = opaque;
1349 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1351 /* At this point, backend must be stopped, otherwise
1352 * it might keep writing to memory. */
1353 assert(!n->vhost_started);
1354 virtio_save(vdev, f);
1357 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f)
1359 VirtIONet *n = VIRTIO_NET(vdev);
1362 qemu_put_buffer(f, n->mac, ETH_ALEN);
1363 qemu_put_be32(f, n->vqs[0].tx_waiting);
1364 qemu_put_be32(f, n->mergeable_rx_bufs);
1365 qemu_put_be16(f, n->status);
1366 qemu_put_byte(f, n->promisc);
1367 qemu_put_byte(f, n->allmulti);
1368 qemu_put_be32(f, n->mac_table.in_use);
1369 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
1370 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1371 qemu_put_be32(f, n->has_vnet_hdr);
1372 qemu_put_byte(f, n->mac_table.multi_overflow);
1373 qemu_put_byte(f, n->mac_table.uni_overflow);
1374 qemu_put_byte(f, n->alluni);
1375 qemu_put_byte(f, n->nomulti);
1376 qemu_put_byte(f, n->nouni);
1377 qemu_put_byte(f, n->nobcast);
1378 qemu_put_byte(f, n->has_ufo);
1379 if (n->max_queues > 1) {
1380 qemu_put_be16(f, n->max_queues);
1381 qemu_put_be16(f, n->curr_queues);
1382 for (i = 1; i < n->curr_queues; i++) {
1383 qemu_put_be32(f, n->vqs[i].tx_waiting);
1387 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1388 qemu_put_be64(f, n->curr_guest_offloads);
1392 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
1394 VirtIONet *n = opaque;
1395 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1397 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
1400 return virtio_load(vdev, f, version_id);
1403 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
1406 VirtIONet *n = VIRTIO_NET(vdev);
1409 qemu_get_buffer(f, n->mac, ETH_ALEN);
1410 n->vqs[0].tx_waiting = qemu_get_be32(f);
1412 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));
1414 if (version_id >= 3)
1415 n->status = qemu_get_be16(f);
1417 if (version_id >= 4) {
1418 if (version_id < 8) {
1419 n->promisc = qemu_get_be32(f);
1420 n->allmulti = qemu_get_be32(f);
1422 n->promisc = qemu_get_byte(f);
1423 n->allmulti = qemu_get_byte(f);
1427 if (version_id >= 5) {
1428 n->mac_table.in_use = qemu_get_be32(f);
1429 /* MAC_TABLE_ENTRIES may be different from the saved image */
1430 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
1431 qemu_get_buffer(f, n->mac_table.macs,
1432 n->mac_table.in_use * ETH_ALEN);
1436 /* Overflow detected - can happen if source has a larger MAC table.
1437 * We simply set overflow flag so there's no need to maintain the
1438 * table of addresses, discard them all.
1439 * Note: 64 bit math to avoid integer overflow.
1441 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
1444 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
1445 n->mac_table.in_use = 0;
1449 if (version_id >= 6)
1450 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1452 if (version_id >= 7) {
1453 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
1454 error_report("virtio-net: saved image requires vnet_hdr=on");
1459 if (version_id >= 9) {
1460 n->mac_table.multi_overflow = qemu_get_byte(f);
1461 n->mac_table.uni_overflow = qemu_get_byte(f);
1464 if (version_id >= 10) {
1465 n->alluni = qemu_get_byte(f);
1466 n->nomulti = qemu_get_byte(f);
1467 n->nouni = qemu_get_byte(f);
1468 n->nobcast = qemu_get_byte(f);
1471 if (version_id >= 11) {
1472 if (qemu_get_byte(f) && !peer_has_ufo(n)) {
1473 error_report("virtio-net: saved image requires TUN_F_UFO support");
1478 if (n->max_queues > 1) {
1479 if (n->max_queues != qemu_get_be16(f)) {
1480 error_report("virtio-net: different max_queues ");
1484 n->curr_queues = qemu_get_be16(f);
1485 if (n->curr_queues > n->max_queues) {
1486 error_report("virtio-net: curr_queues %x > max_queues %x",
1487 n->curr_queues, n->max_queues);
1490 for (i = 1; i < n->curr_queues; i++) {
1491 n->vqs[i].tx_waiting = qemu_get_be32(f);
1495 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1496 n->curr_guest_offloads = qemu_get_be64(f);
1498 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1501 if (peer_has_vnet_hdr(n)) {
1502 virtio_net_apply_guest_offloads(n);
1505 virtio_net_set_queues(n);
1507 /* Find the first multicast entry in the saved MAC filter */
1508 for (i = 0; i < n->mac_table.in_use; i++) {
1509 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1513 n->mac_table.first_multi = i;
1515 /* nc.link_down can't be migrated, so infer link_down according
1516 * to link status bit in n->status */
1517 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1518 for (i = 0; i < n->max_queues; i++) {
1519 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1522 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
1523 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
1524 n->announce_counter = SELF_ANNOUNCE_ROUNDS;
1525 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
1531 static NetClientInfo net_virtio_info = {
1532 .type = NET_CLIENT_OPTIONS_KIND_NIC,
1533 .size = sizeof(NICState),
1534 .can_receive = virtio_net_can_receive,
1535 .receive = virtio_net_receive,
1536 .link_status_changed = virtio_net_set_link_status,
1537 .query_rx_filter = virtio_net_query_rxfilter,
1540 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1542 VirtIONet *n = VIRTIO_NET(vdev);
1543 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1544 assert(n->vhost_started);
1545 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
1548 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
1551 VirtIONet *n = VIRTIO_NET(vdev);
1552 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1553 assert(n->vhost_started);
1554 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
1558 static void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features)
1560 int i, config_size = 0;
1561 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
1562 for (i = 0; feature_sizes[i].flags != 0; i++) {
1563 if (host_features & feature_sizes[i].flags) {
1564 config_size = MAX(feature_sizes[i].end, config_size);
1567 n->config_size = config_size;
1570 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1574 * The name can be NULL, the netclient name will be type.x.
1576 assert(type != NULL);
1578 g_free(n->netclient_name);
1579 g_free(n->netclient_type);
1580 n->netclient_name = g_strdup(name);
1581 n->netclient_type = g_strdup(type);
1584 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
1586 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1587 VirtIONet *n = VIRTIO_NET(dev);
1591 virtio_net_set_config_size(n, n->host_features);
1592 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
1594 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
1595 if (n->max_queues * 2 + 1 > VIRTIO_PCI_QUEUE_MAX) {
1596 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
1597 "must be a positive integer less than %d.",
1598 n->max_queues, (VIRTIO_PCI_QUEUE_MAX - 1) / 2);
1599 virtio_cleanup(vdev);
1602 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
1603 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1606 n->tx_timeout = n->net_conf.txtimer;
1608 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
1609 && strcmp(n->net_conf.tx, "bh")) {
1610 error_report("virtio-net: "
1611 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1613 error_report("Defaulting to \"bh\"");
1616 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1617 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
1618 virtio_net_handle_tx_timer);
1619 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer,
1622 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
1623 virtio_net_handle_tx_bh);
1624 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]);
1626 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1627 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
1628 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
1629 n->status = VIRTIO_NET_S_LINK_UP;
1630 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
1631 virtio_net_announce_timer, n);
1633 if (n->netclient_type) {
1635 * Happen when virtio_net_set_netclient_name has been called.
1637 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1638 n->netclient_type, n->netclient_name, n);
1640 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1641 object_get_typename(OBJECT(dev)), dev->id, n);
1644 peer_test_vnet_hdr(n);
1645 if (peer_has_vnet_hdr(n)) {
1646 for (i = 0; i < n->max_queues; i++) {
1647 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
1649 n->host_hdr_len = sizeof(struct virtio_net_hdr);
1651 n->host_hdr_len = 0;
1654 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
1656 n->vqs[0].tx_waiting = 0;
1657 n->tx_burst = n->net_conf.txburst;
1658 virtio_net_set_mrg_rx_bufs(n, 0);
1659 n->promisc = 1; /* for compatibility */
1661 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1663 n->vlans = g_malloc0(MAX_VLAN >> 3);
1665 nc = qemu_get_queue(n->nic);
1666 nc->rxfilter_notify_enabled = 1;
1669 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
1670 virtio_net_save, virtio_net_load, n);
1673 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
1675 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1676 VirtIONet *n = VIRTIO_NET(dev);
1679 /* This will stop vhost backend if appropriate. */
1680 virtio_net_set_status(vdev, 0);
1682 unregister_savevm(dev, "virtio-net", n);
1684 g_free(n->netclient_name);
1685 n->netclient_name = NULL;
1686 g_free(n->netclient_type);
1687 n->netclient_type = NULL;
1689 g_free(n->mac_table.macs);
1692 for (i = 0; i < n->max_queues; i++) {
1693 VirtIONetQueue *q = &n->vqs[i];
1694 NetClientState *nc = qemu_get_subqueue(n->nic, i);
1696 qemu_purge_queued_packets(nc);
1699 timer_del(q->tx_timer);
1700 timer_free(q->tx_timer);
1701 } else if (q->tx_bh) {
1702 qemu_bh_delete(q->tx_bh);
1706 timer_del(n->announce_timer);
1707 timer_free(n->announce_timer);
1709 qemu_del_nic(n->nic);
1710 virtio_cleanup(vdev);
1713 static void virtio_net_instance_init(Object *obj)
1715 VirtIONet *n = VIRTIO_NET(obj);
1718 * The default config_size is sizeof(struct virtio_net_config).
1719 * Can be overriden with virtio_net_set_config_size.
1721 n->config_size = sizeof(struct virtio_net_config);
1722 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
1723 "bootindex", "/ethernet-phy@0",
1727 static Property virtio_net_properties[] = {
1728 DEFINE_VIRTIO_NET_FEATURES(VirtIONet, host_features),
1729 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
1730 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
1732 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
1733 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
1734 DEFINE_PROP_END_OF_LIST(),
1737 static void virtio_net_class_init(ObjectClass *klass, void *data)
1739 DeviceClass *dc = DEVICE_CLASS(klass);
1740 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1742 dc->props = virtio_net_properties;
1743 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1744 vdc->realize = virtio_net_device_realize;
1745 vdc->unrealize = virtio_net_device_unrealize;
1746 vdc->get_config = virtio_net_get_config;
1747 vdc->set_config = virtio_net_set_config;
1748 vdc->get_features = virtio_net_get_features;
1749 vdc->set_features = virtio_net_set_features;
1750 vdc->bad_features = virtio_net_bad_features;
1751 vdc->reset = virtio_net_reset;
1752 vdc->set_status = virtio_net_set_status;
1753 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
1754 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
1755 vdc->load = virtio_net_load_device;
1756 vdc->save = virtio_net_save_device;
1759 static const TypeInfo virtio_net_info = {
1760 .name = TYPE_VIRTIO_NET,
1761 .parent = TYPE_VIRTIO_DEVICE,
1762 .instance_size = sizeof(VirtIONet),
1763 .instance_init = virtio_net_instance_init,
1764 .class_init = virtio_net_class_init,
1767 static void virtio_register_types(void)
1769 type_register_static(&virtio_net_info);
1772 type_init(virtio_register_types)