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 intList *get_vlan_table(VirtIONet *n)
231 intList *list, *entry;
235 for (i = 0; i < MAX_VLAN >> 5; i++) {
236 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
237 if (n->vlans[i] & (1U << j)) {
238 entry = g_malloc0(sizeof(*entry));
239 entry->value = (i << 5) + j;
249 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
251 VirtIONet *n = qemu_get_nic_opaque(nc);
252 VirtIODevice *vdev = VIRTIO_DEVICE(n);
254 strList *str_list, *entry;
257 info = g_malloc0(sizeof(*info));
258 info->name = g_strdup(nc->name);
259 info->promiscuous = n->promisc;
262 info->unicast = RX_STATE_NONE;
263 } else if (n->alluni) {
264 info->unicast = RX_STATE_ALL;
266 info->unicast = RX_STATE_NORMAL;
270 info->multicast = RX_STATE_NONE;
271 } else if (n->allmulti) {
272 info->multicast = RX_STATE_ALL;
274 info->multicast = RX_STATE_NORMAL;
277 info->broadcast_allowed = n->nobcast;
278 info->multicast_overflow = n->mac_table.multi_overflow;
279 info->unicast_overflow = n->mac_table.uni_overflow;
281 info->main_mac = qemu_mac_strdup_printf(n->mac);
284 for (i = 0; i < n->mac_table.first_multi; i++) {
285 entry = g_malloc0(sizeof(*entry));
286 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
287 entry->next = str_list;
290 info->unicast_table = str_list;
293 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
294 entry = g_malloc0(sizeof(*entry));
295 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
296 entry->next = str_list;
299 info->multicast_table = str_list;
300 info->vlan_table = get_vlan_table(n);
302 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
303 info->vlan = RX_STATE_ALL;
304 } else if (!info->vlan_table) {
305 info->vlan = RX_STATE_NONE;
307 info->vlan = RX_STATE_NORMAL;
310 /* enable event notification after query */
311 nc->rxfilter_notify_enabled = 1;
316 static void virtio_net_reset(VirtIODevice *vdev)
318 VirtIONet *n = VIRTIO_NET(vdev);
320 /* Reset back to compatibility mode */
327 /* multiqueue is disabled by default */
329 timer_del(n->announce_timer);
330 n->announce_counter = 0;
331 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
333 /* Flush any MAC and VLAN filter table state */
334 n->mac_table.in_use = 0;
335 n->mac_table.first_multi = 0;
336 n->mac_table.multi_overflow = 0;
337 n->mac_table.uni_overflow = 0;
338 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
339 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
340 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
341 memset(n->vlans, 0, MAX_VLAN >> 3);
344 static void peer_test_vnet_hdr(VirtIONet *n)
346 NetClientState *nc = qemu_get_queue(n->nic);
351 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
354 static int peer_has_vnet_hdr(VirtIONet *n)
356 return n->has_vnet_hdr;
359 static int peer_has_ufo(VirtIONet *n)
361 if (!peer_has_vnet_hdr(n))
364 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
369 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs)
374 n->mergeable_rx_bufs = mergeable_rx_bufs;
376 n->guest_hdr_len = n->mergeable_rx_bufs ?
377 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
379 for (i = 0; i < n->max_queues; i++) {
380 nc = qemu_get_subqueue(n->nic, i);
382 if (peer_has_vnet_hdr(n) &&
383 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
384 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
385 n->host_hdr_len = n->guest_hdr_len;
390 static int peer_attach(VirtIONet *n, int index)
392 NetClientState *nc = qemu_get_subqueue(n->nic, index);
398 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
402 return tap_enable(nc->peer);
405 static int peer_detach(VirtIONet *n, int index)
407 NetClientState *nc = qemu_get_subqueue(n->nic, index);
413 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
417 return tap_disable(nc->peer);
420 static void virtio_net_set_queues(VirtIONet *n)
425 for (i = 0; i < n->max_queues; i++) {
426 if (i < n->curr_queues) {
427 r = peer_attach(n, i);
430 r = peer_detach(n, i);
436 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
438 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
440 VirtIONet *n = VIRTIO_NET(vdev);
441 NetClientState *nc = qemu_get_queue(n->nic);
443 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
445 if (!peer_has_vnet_hdr(n)) {
446 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
447 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
448 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
449 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
451 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
452 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
453 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
454 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
457 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
458 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
459 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
462 if (!get_vhost_net(nc->peer)) {
465 return vhost_net_get_features(get_vhost_net(nc->peer), features);
468 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
470 uint32_t features = 0;
472 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
474 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
475 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
476 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
477 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
478 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
483 static void virtio_net_apply_guest_offloads(VirtIONet *n)
485 qemu_set_offload(qemu_get_queue(n->nic)->peer,
486 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
487 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
488 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
489 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
490 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
493 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
495 static const uint64_t guest_offloads_mask =
496 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
497 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
498 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
499 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
500 (1ULL << VIRTIO_NET_F_GUEST_UFO);
502 return guest_offloads_mask & features;
505 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
507 VirtIODevice *vdev = VIRTIO_DEVICE(n);
508 return virtio_net_guest_offloads_by_features(vdev->guest_features);
511 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
513 VirtIONet *n = VIRTIO_NET(vdev);
516 virtio_net_set_multiqueue(n,
517 __virtio_has_feature(features, VIRTIO_NET_F_MQ));
519 virtio_net_set_mrg_rx_bufs(n,
520 __virtio_has_feature(features,
521 VIRTIO_NET_F_MRG_RXBUF));
523 if (n->has_vnet_hdr) {
524 n->curr_guest_offloads =
525 virtio_net_guest_offloads_by_features(features);
526 virtio_net_apply_guest_offloads(n);
529 for (i = 0; i < n->max_queues; i++) {
530 NetClientState *nc = qemu_get_subqueue(n->nic, i);
532 if (!get_vhost_net(nc->peer)) {
535 vhost_net_ack_features(get_vhost_net(nc->peer), features);
538 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
539 memset(n->vlans, 0, MAX_VLAN >> 3);
541 memset(n->vlans, 0xff, MAX_VLAN >> 3);
545 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
546 struct iovec *iov, unsigned int iov_cnt)
550 NetClientState *nc = qemu_get_queue(n->nic);
552 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
553 if (s != sizeof(on)) {
554 return VIRTIO_NET_ERR;
557 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
559 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
561 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
563 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
565 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
567 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
570 return VIRTIO_NET_ERR;
575 return VIRTIO_NET_OK;
578 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
579 struct iovec *iov, unsigned int iov_cnt)
581 VirtIODevice *vdev = VIRTIO_DEVICE(n);
585 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
586 return VIRTIO_NET_ERR;
589 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
590 if (s != sizeof(offloads)) {
591 return VIRTIO_NET_ERR;
594 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
595 uint64_t supported_offloads;
597 if (!n->has_vnet_hdr) {
598 return VIRTIO_NET_ERR;
601 supported_offloads = virtio_net_supported_guest_offloads(n);
602 if (offloads & ~supported_offloads) {
603 return VIRTIO_NET_ERR;
606 n->curr_guest_offloads = offloads;
607 virtio_net_apply_guest_offloads(n);
609 return VIRTIO_NET_OK;
611 return VIRTIO_NET_ERR;
615 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
616 struct iovec *iov, unsigned int iov_cnt)
618 VirtIODevice *vdev = VIRTIO_DEVICE(n);
619 struct virtio_net_ctrl_mac mac_data;
621 NetClientState *nc = qemu_get_queue(n->nic);
623 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
624 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
625 return VIRTIO_NET_ERR;
627 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
628 assert(s == sizeof(n->mac));
629 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
632 return VIRTIO_NET_OK;
635 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
636 return VIRTIO_NET_ERR;
641 uint8_t uni_overflow = 0;
642 uint8_t multi_overflow = 0;
643 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
645 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
646 sizeof(mac_data.entries));
647 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
648 if (s != sizeof(mac_data.entries)) {
651 iov_discard_front(&iov, &iov_cnt, s);
653 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
657 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
658 s = iov_to_buf(iov, iov_cnt, 0, macs,
659 mac_data.entries * ETH_ALEN);
660 if (s != mac_data.entries * ETH_ALEN) {
663 in_use += mac_data.entries;
668 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
670 first_multi = in_use;
672 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
673 sizeof(mac_data.entries));
674 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
675 if (s != sizeof(mac_data.entries)) {
679 iov_discard_front(&iov, &iov_cnt, s);
681 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
685 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
686 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
687 mac_data.entries * ETH_ALEN);
688 if (s != mac_data.entries * ETH_ALEN) {
691 in_use += mac_data.entries;
696 n->mac_table.in_use = in_use;
697 n->mac_table.first_multi = first_multi;
698 n->mac_table.uni_overflow = uni_overflow;
699 n->mac_table.multi_overflow = multi_overflow;
700 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
704 return VIRTIO_NET_OK;
708 return VIRTIO_NET_ERR;
711 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
712 struct iovec *iov, unsigned int iov_cnt)
714 VirtIODevice *vdev = VIRTIO_DEVICE(n);
717 NetClientState *nc = qemu_get_queue(n->nic);
719 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
720 vid = virtio_lduw_p(vdev, &vid);
721 if (s != sizeof(vid)) {
722 return VIRTIO_NET_ERR;
726 return VIRTIO_NET_ERR;
728 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
729 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
730 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
731 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
733 return VIRTIO_NET_ERR;
737 return VIRTIO_NET_OK;
740 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
741 struct iovec *iov, unsigned int iov_cnt)
743 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
744 n->status & VIRTIO_NET_S_ANNOUNCE) {
745 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
746 if (n->announce_counter) {
747 timer_mod(n->announce_timer,
748 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
749 self_announce_delay(n->announce_counter));
751 return VIRTIO_NET_OK;
753 return VIRTIO_NET_ERR;
757 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
758 struct iovec *iov, unsigned int iov_cnt)
760 VirtIODevice *vdev = VIRTIO_DEVICE(n);
761 struct virtio_net_ctrl_mq mq;
765 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
766 if (s != sizeof(mq)) {
767 return VIRTIO_NET_ERR;
770 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
771 return VIRTIO_NET_ERR;
774 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
776 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
777 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
778 queues > n->max_queues ||
780 return VIRTIO_NET_ERR;
783 n->curr_queues = queues;
784 /* stop the backend before changing the number of queues to avoid handling a
786 virtio_net_set_status(vdev, vdev->status);
787 virtio_net_set_queues(n);
789 return VIRTIO_NET_OK;
791 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
793 VirtIONet *n = VIRTIO_NET(vdev);
794 struct virtio_net_ctrl_hdr ctrl;
795 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
796 VirtQueueElement elem;
798 struct iovec *iov, *iov2;
799 unsigned int iov_cnt;
801 while (virtqueue_pop(vq, &elem)) {
802 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) ||
803 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
804 error_report("virtio-net ctrl missing headers");
808 iov_cnt = elem.out_num;
809 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num);
810 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
811 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
812 if (s != sizeof(ctrl)) {
813 status = VIRTIO_NET_ERR;
814 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
815 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
816 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
817 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
818 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
819 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
820 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
821 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
822 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
823 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
824 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
825 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
828 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
829 assert(s == sizeof(status));
831 virtqueue_push(vq, &elem, sizeof(status));
832 virtio_notify(vdev, vq);
839 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
841 VirtIONet *n = VIRTIO_NET(vdev);
842 int queue_index = vq2q(virtio_get_queue_index(vq));
844 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
847 static int virtio_net_can_receive(NetClientState *nc)
849 VirtIONet *n = qemu_get_nic_opaque(nc);
850 VirtIODevice *vdev = VIRTIO_DEVICE(n);
851 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
853 if (!vdev->vm_running) {
857 if (nc->queue_index >= n->curr_queues) {
861 if (!virtio_queue_ready(q->rx_vq) ||
862 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
869 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
872 if (virtio_queue_empty(q->rx_vq) ||
873 (n->mergeable_rx_bufs &&
874 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
875 virtio_queue_set_notification(q->rx_vq, 1);
877 /* To avoid a race condition where the guest has made some buffers
878 * available after the above check but before notification was
879 * enabled, check for available buffers again.
881 if (virtio_queue_empty(q->rx_vq) ||
882 (n->mergeable_rx_bufs &&
883 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
888 virtio_queue_set_notification(q->rx_vq, 0);
892 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
894 virtio_tswap16s(vdev, &hdr->hdr_len);
895 virtio_tswap16s(vdev, &hdr->gso_size);
896 virtio_tswap16s(vdev, &hdr->csum_start);
897 virtio_tswap16s(vdev, &hdr->csum_offset);
900 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
901 * it never finds out that the packets don't have valid checksums. This
902 * causes dhclient to get upset. Fedora's carried a patch for ages to
903 * fix this with Xen but it hasn't appeared in an upstream release of
906 * To avoid breaking existing guests, we catch udp packets and add
907 * checksums. This is terrible but it's better than hacking the guest
910 * N.B. if we introduce a zero-copy API, this operation is no longer free so
911 * we should provide a mechanism to disable it to avoid polluting the host
914 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
915 uint8_t *buf, size_t size)
917 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
918 (size > 27 && size < 1500) && /* normal sized MTU */
919 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
920 (buf[23] == 17) && /* ip.protocol == UDP */
921 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
922 net_checksum_calculate(buf, size);
923 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
927 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
928 const void *buf, size_t size)
930 if (n->has_vnet_hdr) {
931 /* FIXME this cast is evil */
932 void *wbuf = (void *)buf;
933 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
934 size - n->host_hdr_len);
935 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
936 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
938 struct virtio_net_hdr hdr = {
940 .gso_type = VIRTIO_NET_HDR_GSO_NONE
942 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
946 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
948 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
949 static const uint8_t vlan[] = {0x81, 0x00};
950 uint8_t *ptr = (uint8_t *)buf;
956 ptr += n->host_hdr_len;
958 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
959 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
960 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
964 if (ptr[0] & 1) { // multicast
965 if (!memcmp(ptr, bcast, sizeof(bcast))) {
967 } else if (n->nomulti) {
969 } else if (n->allmulti || n->mac_table.multi_overflow) {
973 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
974 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
981 } else if (n->alluni || n->mac_table.uni_overflow) {
983 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
987 for (i = 0; i < n->mac_table.first_multi; i++) {
988 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
997 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
999 VirtIONet *n = qemu_get_nic_opaque(nc);
1000 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1001 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1002 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1003 struct virtio_net_hdr_mrg_rxbuf mhdr;
1004 unsigned mhdr_cnt = 0;
1005 size_t offset, i, guest_offset;
1007 if (!virtio_net_can_receive(nc)) {
1011 /* hdr_len refers to the header we supply to the guest */
1012 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1016 if (!receive_filter(n, buf, size))
1021 while (offset < size) {
1022 VirtQueueElement elem;
1024 const struct iovec *sg = elem.in_sg;
1028 if (virtqueue_pop(q->rx_vq, &elem) == 0) {
1031 error_report("virtio-net unexpected empty queue: "
1032 "i %zd mergeable %d offset %zd, size %zd, "
1033 "guest hdr len %zd, host hdr len %zd guest features 0x%x",
1034 i, n->mergeable_rx_bufs, offset, size,
1035 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features);
1039 if (elem.in_num < 1) {
1040 error_report("virtio-net receive queue contains no in buffers");
1045 assert(offset == 0);
1046 if (n->mergeable_rx_bufs) {
1047 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1049 offsetof(typeof(mhdr), num_buffers),
1050 sizeof(mhdr.num_buffers));
1053 receive_header(n, sg, elem.in_num, buf, size);
1054 offset = n->host_hdr_len;
1055 total += n->guest_hdr_len;
1056 guest_offset = n->guest_hdr_len;
1061 /* copy in packet. ugh */
1062 len = iov_from_buf(sg, elem.in_num, guest_offset,
1063 buf + offset, size - offset);
1066 /* If buffers can't be merged, at this point we
1067 * must have consumed the complete packet.
1068 * Otherwise, drop it. */
1069 if (!n->mergeable_rx_bufs && offset < size) {
1071 error_report("virtio-net truncated non-mergeable packet: "
1072 "i %zd mergeable %d offset %zd, size %zd, "
1073 "guest hdr len %zd, host hdr len %zd",
1074 i, n->mergeable_rx_bufs,
1075 offset, size, n->guest_hdr_len, n->host_hdr_len);
1080 /* signal other side */
1081 virtqueue_fill(q->rx_vq, &elem, total, i++);
1085 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1086 iov_from_buf(mhdr_sg, mhdr_cnt,
1088 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1091 virtqueue_flush(q->rx_vq, i);
1092 virtio_notify(vdev, q->rx_vq);
1097 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1099 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1101 VirtIONet *n = qemu_get_nic_opaque(nc);
1102 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1103 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1105 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
1106 virtio_notify(vdev, q->tx_vq);
1108 q->async_tx.elem.out_num = q->async_tx.len = 0;
1110 virtio_queue_set_notification(q->tx_vq, 1);
1111 virtio_net_flush_tx(q);
1115 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1117 VirtIONet *n = q->n;
1118 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1119 VirtQueueElement elem;
1120 int32_t num_packets = 0;
1121 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1122 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1126 if (q->async_tx.elem.out_num) {
1127 virtio_queue_set_notification(q->tx_vq, 0);
1131 while (virtqueue_pop(q->tx_vq, &elem)) {
1133 unsigned int out_num = elem.out_num;
1134 struct iovec *out_sg = &elem.out_sg[0];
1135 struct iovec sg[VIRTQUEUE_MAX_SIZE];
1138 error_report("virtio-net header not in first element");
1142 if (n->has_vnet_hdr) {
1143 if (out_sg[0].iov_len < n->guest_hdr_len) {
1144 error_report("virtio-net header incorrect");
1147 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base);
1151 * If host wants to see the guest header as is, we can
1152 * pass it on unchanged. Otherwise, copy just the parts
1153 * that host is interested in.
1155 assert(n->host_hdr_len <= n->guest_hdr_len);
1156 if (n->host_hdr_len != n->guest_hdr_len) {
1157 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1159 0, n->host_hdr_len);
1160 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1162 n->guest_hdr_len, -1);
1167 len = n->guest_hdr_len;
1169 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1170 out_sg, out_num, virtio_net_tx_complete);
1172 virtio_queue_set_notification(q->tx_vq, 0);
1173 q->async_tx.elem = elem;
1174 q->async_tx.len = len;
1180 virtqueue_push(q->tx_vq, &elem, 0);
1181 virtio_notify(vdev, q->tx_vq);
1183 if (++num_packets >= n->tx_burst) {
1190 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1192 VirtIONet *n = VIRTIO_NET(vdev);
1193 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1195 /* This happens when device was stopped but VCPU wasn't. */
1196 if (!vdev->vm_running) {
1201 if (q->tx_waiting) {
1202 virtio_queue_set_notification(vq, 1);
1203 timer_del(q->tx_timer);
1205 virtio_net_flush_tx(q);
1207 timer_mod(q->tx_timer,
1208 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1210 virtio_queue_set_notification(vq, 0);
1214 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1216 VirtIONet *n = VIRTIO_NET(vdev);
1217 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1219 if (unlikely(q->tx_waiting)) {
1223 /* This happens when device was stopped but VCPU wasn't. */
1224 if (!vdev->vm_running) {
1227 virtio_queue_set_notification(vq, 0);
1228 qemu_bh_schedule(q->tx_bh);
1231 static void virtio_net_tx_timer(void *opaque)
1233 VirtIONetQueue *q = opaque;
1234 VirtIONet *n = q->n;
1235 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1236 /* This happens when device was stopped but BH wasn't. */
1237 if (!vdev->vm_running) {
1238 /* Make sure tx waiting is set, so we'll run when restarted. */
1239 assert(q->tx_waiting);
1245 /* Just in case the driver is not ready on more */
1246 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1250 virtio_queue_set_notification(q->tx_vq, 1);
1251 virtio_net_flush_tx(q);
1254 static void virtio_net_tx_bh(void *opaque)
1256 VirtIONetQueue *q = opaque;
1257 VirtIONet *n = q->n;
1258 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1261 /* This happens when device was stopped but BH wasn't. */
1262 if (!vdev->vm_running) {
1263 /* Make sure tx waiting is set, so we'll run when restarted. */
1264 assert(q->tx_waiting);
1270 /* Just in case the driver is not ready on more */
1271 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1275 ret = virtio_net_flush_tx(q);
1276 if (ret == -EBUSY) {
1277 return; /* Notification re-enable handled by tx_complete */
1280 /* If we flush a full burst of packets, assume there are
1281 * more coming and immediately reschedule */
1282 if (ret >= n->tx_burst) {
1283 qemu_bh_schedule(q->tx_bh);
1288 /* If less than a full burst, re-enable notification and flush
1289 * anything that may have come in while we weren't looking. If
1290 * we find something, assume the guest is still active and reschedule */
1291 virtio_queue_set_notification(q->tx_vq, 1);
1292 if (virtio_net_flush_tx(q) > 0) {
1293 virtio_queue_set_notification(q->tx_vq, 0);
1294 qemu_bh_schedule(q->tx_bh);
1299 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1301 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1302 int i, max = multiqueue ? n->max_queues : 1;
1304 n->multiqueue = multiqueue;
1306 for (i = 2; i <= n->max_queues * 2 + 1; i++) {
1307 virtio_del_queue(vdev, i);
1310 for (i = 1; i < max; i++) {
1311 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1312 if (n->vqs[i].tx_timer) {
1314 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
1315 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1316 virtio_net_tx_timer,
1320 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
1321 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]);
1324 n->vqs[i].tx_waiting = 0;
1328 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack
1329 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid
1332 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1334 virtio_net_set_queues(n);
1337 static void virtio_net_save(QEMUFile *f, void *opaque)
1339 VirtIONet *n = opaque;
1340 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1342 /* At this point, backend must be stopped, otherwise
1343 * it might keep writing to memory. */
1344 assert(!n->vhost_started);
1345 virtio_save(vdev, f);
1348 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f)
1350 VirtIONet *n = VIRTIO_NET(vdev);
1353 qemu_put_buffer(f, n->mac, ETH_ALEN);
1354 qemu_put_be32(f, n->vqs[0].tx_waiting);
1355 qemu_put_be32(f, n->mergeable_rx_bufs);
1356 qemu_put_be16(f, n->status);
1357 qemu_put_byte(f, n->promisc);
1358 qemu_put_byte(f, n->allmulti);
1359 qemu_put_be32(f, n->mac_table.in_use);
1360 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
1361 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1362 qemu_put_be32(f, n->has_vnet_hdr);
1363 qemu_put_byte(f, n->mac_table.multi_overflow);
1364 qemu_put_byte(f, n->mac_table.uni_overflow);
1365 qemu_put_byte(f, n->alluni);
1366 qemu_put_byte(f, n->nomulti);
1367 qemu_put_byte(f, n->nouni);
1368 qemu_put_byte(f, n->nobcast);
1369 qemu_put_byte(f, n->has_ufo);
1370 if (n->max_queues > 1) {
1371 qemu_put_be16(f, n->max_queues);
1372 qemu_put_be16(f, n->curr_queues);
1373 for (i = 1; i < n->curr_queues; i++) {
1374 qemu_put_be32(f, n->vqs[i].tx_waiting);
1378 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1379 qemu_put_be64(f, n->curr_guest_offloads);
1383 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
1385 VirtIONet *n = opaque;
1386 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1388 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
1391 return virtio_load(vdev, f, version_id);
1394 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
1397 VirtIONet *n = VIRTIO_NET(vdev);
1400 qemu_get_buffer(f, n->mac, ETH_ALEN);
1401 n->vqs[0].tx_waiting = qemu_get_be32(f);
1403 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));
1405 if (version_id >= 3)
1406 n->status = qemu_get_be16(f);
1408 if (version_id >= 4) {
1409 if (version_id < 8) {
1410 n->promisc = qemu_get_be32(f);
1411 n->allmulti = qemu_get_be32(f);
1413 n->promisc = qemu_get_byte(f);
1414 n->allmulti = qemu_get_byte(f);
1418 if (version_id >= 5) {
1419 n->mac_table.in_use = qemu_get_be32(f);
1420 /* MAC_TABLE_ENTRIES may be different from the saved image */
1421 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
1422 qemu_get_buffer(f, n->mac_table.macs,
1423 n->mac_table.in_use * ETH_ALEN);
1427 /* Overflow detected - can happen if source has a larger MAC table.
1428 * We simply set overflow flag so there's no need to maintain the
1429 * table of addresses, discard them all.
1430 * Note: 64 bit math to avoid integer overflow.
1432 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
1435 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
1436 n->mac_table.in_use = 0;
1440 if (version_id >= 6)
1441 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1443 if (version_id >= 7) {
1444 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
1445 error_report("virtio-net: saved image requires vnet_hdr=on");
1450 if (version_id >= 9) {
1451 n->mac_table.multi_overflow = qemu_get_byte(f);
1452 n->mac_table.uni_overflow = qemu_get_byte(f);
1455 if (version_id >= 10) {
1456 n->alluni = qemu_get_byte(f);
1457 n->nomulti = qemu_get_byte(f);
1458 n->nouni = qemu_get_byte(f);
1459 n->nobcast = qemu_get_byte(f);
1462 if (version_id >= 11) {
1463 if (qemu_get_byte(f) && !peer_has_ufo(n)) {
1464 error_report("virtio-net: saved image requires TUN_F_UFO support");
1469 if (n->max_queues > 1) {
1470 if (n->max_queues != qemu_get_be16(f)) {
1471 error_report("virtio-net: different max_queues ");
1475 n->curr_queues = qemu_get_be16(f);
1476 if (n->curr_queues > n->max_queues) {
1477 error_report("virtio-net: curr_queues %x > max_queues %x",
1478 n->curr_queues, n->max_queues);
1481 for (i = 1; i < n->curr_queues; i++) {
1482 n->vqs[i].tx_waiting = qemu_get_be32(f);
1486 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1487 n->curr_guest_offloads = qemu_get_be64(f);
1489 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1492 if (peer_has_vnet_hdr(n)) {
1493 virtio_net_apply_guest_offloads(n);
1496 virtio_net_set_queues(n);
1498 /* Find the first multicast entry in the saved MAC filter */
1499 for (i = 0; i < n->mac_table.in_use; i++) {
1500 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1504 n->mac_table.first_multi = i;
1506 /* nc.link_down can't be migrated, so infer link_down according
1507 * to link status bit in n->status */
1508 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1509 for (i = 0; i < n->max_queues; i++) {
1510 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1513 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
1514 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
1515 n->announce_counter = SELF_ANNOUNCE_ROUNDS;
1516 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
1522 static NetClientInfo net_virtio_info = {
1523 .type = NET_CLIENT_OPTIONS_KIND_NIC,
1524 .size = sizeof(NICState),
1525 .can_receive = virtio_net_can_receive,
1526 .receive = virtio_net_receive,
1527 .link_status_changed = virtio_net_set_link_status,
1528 .query_rx_filter = virtio_net_query_rxfilter,
1531 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1533 VirtIONet *n = VIRTIO_NET(vdev);
1534 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1535 assert(n->vhost_started);
1536 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
1539 static void virtio_net_guest_notifier_mask(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 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
1549 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features)
1551 int i, config_size = 0;
1552 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
1553 for (i = 0; feature_sizes[i].flags != 0; i++) {
1554 if (host_features & feature_sizes[i].flags) {
1555 config_size = MAX(feature_sizes[i].end, config_size);
1558 n->config_size = config_size;
1561 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1565 * The name can be NULL, the netclient name will be type.x.
1567 assert(type != NULL);
1569 g_free(n->netclient_name);
1570 g_free(n->netclient_type);
1571 n->netclient_name = g_strdup(name);
1572 n->netclient_type = g_strdup(type);
1575 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
1577 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1578 VirtIONet *n = VIRTIO_NET(dev);
1582 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
1584 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
1585 if (n->max_queues * 2 + 1 > VIRTIO_PCI_QUEUE_MAX) {
1586 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
1587 "must be a positive integer less than %d.",
1588 n->max_queues, (VIRTIO_PCI_QUEUE_MAX - 1) / 2);
1589 virtio_cleanup(vdev);
1592 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
1593 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1596 n->tx_timeout = n->net_conf.txtimer;
1598 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
1599 && strcmp(n->net_conf.tx, "bh")) {
1600 error_report("virtio-net: "
1601 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1603 error_report("Defaulting to \"bh\"");
1606 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1607 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
1608 virtio_net_handle_tx_timer);
1609 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer,
1612 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
1613 virtio_net_handle_tx_bh);
1614 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]);
1616 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1617 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
1618 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
1619 n->status = VIRTIO_NET_S_LINK_UP;
1620 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
1621 virtio_net_announce_timer, n);
1623 if (n->netclient_type) {
1625 * Happen when virtio_net_set_netclient_name has been called.
1627 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1628 n->netclient_type, n->netclient_name, n);
1630 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1631 object_get_typename(OBJECT(dev)), dev->id, n);
1634 peer_test_vnet_hdr(n);
1635 if (peer_has_vnet_hdr(n)) {
1636 for (i = 0; i < n->max_queues; i++) {
1637 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
1639 n->host_hdr_len = sizeof(struct virtio_net_hdr);
1641 n->host_hdr_len = 0;
1644 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
1646 n->vqs[0].tx_waiting = 0;
1647 n->tx_burst = n->net_conf.txburst;
1648 virtio_net_set_mrg_rx_bufs(n, 0);
1649 n->promisc = 1; /* for compatibility */
1651 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1653 n->vlans = g_malloc0(MAX_VLAN >> 3);
1655 nc = qemu_get_queue(n->nic);
1656 nc->rxfilter_notify_enabled = 1;
1659 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
1660 virtio_net_save, virtio_net_load, n);
1663 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
1665 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1666 VirtIONet *n = VIRTIO_NET(dev);
1669 /* This will stop vhost backend if appropriate. */
1670 virtio_net_set_status(vdev, 0);
1672 unregister_savevm(dev, "virtio-net", n);
1674 g_free(n->netclient_name);
1675 n->netclient_name = NULL;
1676 g_free(n->netclient_type);
1677 n->netclient_type = NULL;
1679 g_free(n->mac_table.macs);
1682 for (i = 0; i < n->max_queues; i++) {
1683 VirtIONetQueue *q = &n->vqs[i];
1684 NetClientState *nc = qemu_get_subqueue(n->nic, i);
1686 qemu_purge_queued_packets(nc);
1689 timer_del(q->tx_timer);
1690 timer_free(q->tx_timer);
1691 } else if (q->tx_bh) {
1692 qemu_bh_delete(q->tx_bh);
1696 timer_del(n->announce_timer);
1697 timer_free(n->announce_timer);
1699 qemu_del_nic(n->nic);
1700 virtio_cleanup(vdev);
1703 static void virtio_net_instance_init(Object *obj)
1705 VirtIONet *n = VIRTIO_NET(obj);
1708 * The default config_size is sizeof(struct virtio_net_config).
1709 * Can be overriden with virtio_net_set_config_size.
1711 n->config_size = sizeof(struct virtio_net_config);
1712 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
1713 "bootindex", "/ethernet-phy@0",
1717 static Property virtio_net_properties[] = {
1718 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
1719 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
1721 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
1722 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
1723 DEFINE_PROP_END_OF_LIST(),
1726 static void virtio_net_class_init(ObjectClass *klass, void *data)
1728 DeviceClass *dc = DEVICE_CLASS(klass);
1729 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1731 dc->props = virtio_net_properties;
1732 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1733 vdc->realize = virtio_net_device_realize;
1734 vdc->unrealize = virtio_net_device_unrealize;
1735 vdc->get_config = virtio_net_get_config;
1736 vdc->set_config = virtio_net_set_config;
1737 vdc->get_features = virtio_net_get_features;
1738 vdc->set_features = virtio_net_set_features;
1739 vdc->bad_features = virtio_net_bad_features;
1740 vdc->reset = virtio_net_reset;
1741 vdc->set_status = virtio_net_set_status;
1742 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
1743 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
1744 vdc->load = virtio_net_load_device;
1745 vdc->save = virtio_net_save_device;
1748 static const TypeInfo virtio_net_info = {
1749 .name = TYPE_VIRTIO_NET,
1750 .parent = TYPE_VIRTIO_DEVICE,
1751 .instance_size = sizeof(VirtIONet),
1752 .instance_init = virtio_net_instance_init,
1753 .class_init = virtio_net_class_init,
1756 static void virtio_register_types(void)
1758 type_register_static(&virtio_net_info);
1761 type_init(virtio_register_types)