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 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1) &&
91 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
92 memcpy(n->mac, netcfg.mac, ETH_ALEN);
93 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
97 static bool virtio_net_started(VirtIONet *n, uint8_t status)
99 VirtIODevice *vdev = VIRTIO_DEVICE(n);
100 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
101 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
104 static void virtio_net_announce_timer(void *opaque)
106 VirtIONet *n = opaque;
107 VirtIODevice *vdev = VIRTIO_DEVICE(n);
109 n->announce_counter--;
110 n->status |= VIRTIO_NET_S_ANNOUNCE;
111 virtio_notify_config(vdev);
114 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
116 VirtIODevice *vdev = VIRTIO_DEVICE(n);
117 NetClientState *nc = qemu_get_queue(n->nic);
118 int queues = n->multiqueue ? n->max_queues : 1;
120 if (!get_vhost_net(nc->peer)) {
124 if ((virtio_net_started(n, status) && !nc->peer->link_down) ==
125 !!n->vhost_started) {
128 if (!n->vhost_started) {
131 if (!vhost_net_query(get_vhost_net(nc->peer), vdev)) {
135 /* Any packets outstanding? Purge them to avoid touching rings
136 * when vhost is running.
138 for (i = 0; i < queues; i++) {
139 NetClientState *qnc = qemu_get_subqueue(n->nic, i);
141 /* Purge both directions: TX and RX. */
142 qemu_net_queue_purge(qnc->peer->incoming_queue, qnc);
143 qemu_net_queue_purge(qnc->incoming_queue, qnc->peer);
146 n->vhost_started = 1;
147 r = vhost_net_start(vdev, n->nic->ncs, queues);
149 error_report("unable to start vhost net: %d: "
150 "falling back on userspace virtio", -r);
151 n->vhost_started = 0;
154 vhost_net_stop(vdev, n->nic->ncs, queues);
155 n->vhost_started = 0;
159 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
161 VirtIONet *n = VIRTIO_NET(vdev);
164 uint8_t queue_status;
166 virtio_net_vhost_status(n, status);
168 for (i = 0; i < n->max_queues; i++) {
171 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
174 queue_status = status;
177 if (!q->tx_waiting) {
181 if (virtio_net_started(n, queue_status) && !n->vhost_started) {
183 timer_mod(q->tx_timer,
184 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
186 qemu_bh_schedule(q->tx_bh);
190 timer_del(q->tx_timer);
192 qemu_bh_cancel(q->tx_bh);
198 static void virtio_net_set_link_status(NetClientState *nc)
200 VirtIONet *n = qemu_get_nic_opaque(nc);
201 VirtIODevice *vdev = VIRTIO_DEVICE(n);
202 uint16_t old_status = n->status;
205 n->status &= ~VIRTIO_NET_S_LINK_UP;
207 n->status |= VIRTIO_NET_S_LINK_UP;
209 if (n->status != old_status)
210 virtio_notify_config(vdev);
212 virtio_net_set_status(vdev, vdev->status);
215 static void rxfilter_notify(NetClientState *nc)
217 VirtIONet *n = qemu_get_nic_opaque(nc);
219 if (nc->rxfilter_notify_enabled) {
220 gchar *path = object_get_canonical_path(OBJECT(n->qdev));
221 qapi_event_send_nic_rx_filter_changed(!!n->netclient_name,
222 n->netclient_name, path, &error_abort);
225 /* disable event notification to avoid events flooding */
226 nc->rxfilter_notify_enabled = 0;
230 static intList *get_vlan_table(VirtIONet *n)
232 intList *list, *entry;
236 for (i = 0; i < MAX_VLAN >> 5; i++) {
237 for (j = 0; n->vlans[i] && j <= 0x1f; j++) {
238 if (n->vlans[i] & (1U << j)) {
239 entry = g_malloc0(sizeof(*entry));
240 entry->value = (i << 5) + j;
250 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
252 VirtIONet *n = qemu_get_nic_opaque(nc);
253 VirtIODevice *vdev = VIRTIO_DEVICE(n);
255 strList *str_list, *entry;
258 info = g_malloc0(sizeof(*info));
259 info->name = g_strdup(nc->name);
260 info->promiscuous = n->promisc;
263 info->unicast = RX_STATE_NONE;
264 } else if (n->alluni) {
265 info->unicast = RX_STATE_ALL;
267 info->unicast = RX_STATE_NORMAL;
271 info->multicast = RX_STATE_NONE;
272 } else if (n->allmulti) {
273 info->multicast = RX_STATE_ALL;
275 info->multicast = RX_STATE_NORMAL;
278 info->broadcast_allowed = n->nobcast;
279 info->multicast_overflow = n->mac_table.multi_overflow;
280 info->unicast_overflow = n->mac_table.uni_overflow;
282 info->main_mac = qemu_mac_strdup_printf(n->mac);
285 for (i = 0; i < n->mac_table.first_multi; i++) {
286 entry = g_malloc0(sizeof(*entry));
287 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
288 entry->next = str_list;
291 info->unicast_table = str_list;
294 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
295 entry = g_malloc0(sizeof(*entry));
296 entry->value = qemu_mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
297 entry->next = str_list;
300 info->multicast_table = str_list;
301 info->vlan_table = get_vlan_table(n);
303 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VLAN)) {
304 info->vlan = RX_STATE_ALL;
305 } else if (!info->vlan_table) {
306 info->vlan = RX_STATE_NONE;
308 info->vlan = RX_STATE_NORMAL;
311 /* enable event notification after query */
312 nc->rxfilter_notify_enabled = 1;
317 static void virtio_net_reset(VirtIODevice *vdev)
319 VirtIONet *n = VIRTIO_NET(vdev);
321 /* Reset back to compatibility mode */
328 /* multiqueue is disabled by default */
330 timer_del(n->announce_timer);
331 n->announce_counter = 0;
332 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
334 /* Flush any MAC and VLAN filter table state */
335 n->mac_table.in_use = 0;
336 n->mac_table.first_multi = 0;
337 n->mac_table.multi_overflow = 0;
338 n->mac_table.uni_overflow = 0;
339 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
340 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
341 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
342 memset(n->vlans, 0, MAX_VLAN >> 3);
345 static void peer_test_vnet_hdr(VirtIONet *n)
347 NetClientState *nc = qemu_get_queue(n->nic);
352 n->has_vnet_hdr = qemu_has_vnet_hdr(nc->peer);
355 static int peer_has_vnet_hdr(VirtIONet *n)
357 return n->has_vnet_hdr;
360 static int peer_has_ufo(VirtIONet *n)
362 if (!peer_has_vnet_hdr(n))
365 n->has_ufo = qemu_has_ufo(qemu_get_queue(n->nic)->peer);
370 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs,
376 n->mergeable_rx_bufs = mergeable_rx_bufs;
379 n->guest_hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
381 n->guest_hdr_len = n->mergeable_rx_bufs ?
382 sizeof(struct virtio_net_hdr_mrg_rxbuf) :
383 sizeof(struct virtio_net_hdr);
386 for (i = 0; i < n->max_queues; i++) {
387 nc = qemu_get_subqueue(n->nic, i);
389 if (peer_has_vnet_hdr(n) &&
390 qemu_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
391 qemu_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
392 n->host_hdr_len = n->guest_hdr_len;
397 static int peer_attach(VirtIONet *n, int index)
399 NetClientState *nc = qemu_get_subqueue(n->nic, index);
405 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
409 return tap_enable(nc->peer);
412 static int peer_detach(VirtIONet *n, int index)
414 NetClientState *nc = qemu_get_subqueue(n->nic, index);
420 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
424 return tap_disable(nc->peer);
427 static void virtio_net_set_queues(VirtIONet *n)
432 for (i = 0; i < n->max_queues; i++) {
433 if (i < n->curr_queues) {
434 r = peer_attach(n, i);
437 r = peer_detach(n, i);
443 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
445 static uint64_t virtio_net_get_features(VirtIODevice *vdev, uint64_t features)
447 VirtIONet *n = VIRTIO_NET(vdev);
448 NetClientState *nc = qemu_get_queue(n->nic);
450 /* Firstly sync all virtio-net possible supported features */
451 features |= n->host_features;
453 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
455 if (!peer_has_vnet_hdr(n)) {
456 virtio_clear_feature(&features, VIRTIO_NET_F_CSUM);
457 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO4);
458 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_TSO6);
459 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_ECN);
461 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_CSUM);
462 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO4);
463 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_TSO6);
464 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_ECN);
467 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
468 virtio_clear_feature(&features, VIRTIO_NET_F_GUEST_UFO);
469 virtio_clear_feature(&features, VIRTIO_NET_F_HOST_UFO);
472 if (!get_vhost_net(nc->peer)) {
473 virtio_add_feature(&features, VIRTIO_F_VERSION_1);
476 return vhost_net_get_features(get_vhost_net(nc->peer), features);
479 static uint64_t virtio_net_bad_features(VirtIODevice *vdev)
481 uint64_t features = 0;
483 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
485 virtio_add_feature(&features, VIRTIO_NET_F_MAC);
486 virtio_add_feature(&features, VIRTIO_NET_F_CSUM);
487 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO4);
488 virtio_add_feature(&features, VIRTIO_NET_F_HOST_TSO6);
489 virtio_add_feature(&features, VIRTIO_NET_F_HOST_ECN);
494 static void virtio_net_apply_guest_offloads(VirtIONet *n)
496 qemu_set_offload(qemu_get_queue(n->nic)->peer,
497 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
498 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
499 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
500 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
501 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
504 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
506 static const uint64_t guest_offloads_mask =
507 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
508 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
509 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
510 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
511 (1ULL << VIRTIO_NET_F_GUEST_UFO);
513 return guest_offloads_mask & features;
516 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
518 VirtIODevice *vdev = VIRTIO_DEVICE(n);
519 return virtio_net_guest_offloads_by_features(vdev->guest_features);
522 static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
524 VirtIONet *n = VIRTIO_NET(vdev);
527 virtio_net_set_multiqueue(n,
528 __virtio_has_feature(features, VIRTIO_NET_F_MQ));
530 virtio_net_set_mrg_rx_bufs(n,
531 __virtio_has_feature(features,
532 VIRTIO_NET_F_MRG_RXBUF),
533 __virtio_has_feature(features,
534 VIRTIO_F_VERSION_1));
536 if (n->has_vnet_hdr) {
537 n->curr_guest_offloads =
538 virtio_net_guest_offloads_by_features(features);
539 virtio_net_apply_guest_offloads(n);
542 for (i = 0; i < n->max_queues; i++) {
543 NetClientState *nc = qemu_get_subqueue(n->nic, i);
545 if (!get_vhost_net(nc->peer)) {
548 vhost_net_ack_features(get_vhost_net(nc->peer), features);
551 if (__virtio_has_feature(features, VIRTIO_NET_F_CTRL_VLAN)) {
552 memset(n->vlans, 0, MAX_VLAN >> 3);
554 memset(n->vlans, 0xff, MAX_VLAN >> 3);
558 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
559 struct iovec *iov, unsigned int iov_cnt)
563 NetClientState *nc = qemu_get_queue(n->nic);
565 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
566 if (s != sizeof(on)) {
567 return VIRTIO_NET_ERR;
570 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
572 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
574 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
576 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
578 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
580 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
583 return VIRTIO_NET_ERR;
588 return VIRTIO_NET_OK;
591 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
592 struct iovec *iov, unsigned int iov_cnt)
594 VirtIODevice *vdev = VIRTIO_DEVICE(n);
598 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
599 return VIRTIO_NET_ERR;
602 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
603 if (s != sizeof(offloads)) {
604 return VIRTIO_NET_ERR;
607 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
608 uint64_t supported_offloads;
610 if (!n->has_vnet_hdr) {
611 return VIRTIO_NET_ERR;
614 supported_offloads = virtio_net_supported_guest_offloads(n);
615 if (offloads & ~supported_offloads) {
616 return VIRTIO_NET_ERR;
619 n->curr_guest_offloads = offloads;
620 virtio_net_apply_guest_offloads(n);
622 return VIRTIO_NET_OK;
624 return VIRTIO_NET_ERR;
628 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
629 struct iovec *iov, unsigned int iov_cnt)
631 VirtIODevice *vdev = VIRTIO_DEVICE(n);
632 struct virtio_net_ctrl_mac mac_data;
634 NetClientState *nc = qemu_get_queue(n->nic);
636 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
637 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
638 return VIRTIO_NET_ERR;
640 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
641 assert(s == sizeof(n->mac));
642 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
645 return VIRTIO_NET_OK;
648 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
649 return VIRTIO_NET_ERR;
654 uint8_t uni_overflow = 0;
655 uint8_t multi_overflow = 0;
656 uint8_t *macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
658 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
659 sizeof(mac_data.entries));
660 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
661 if (s != sizeof(mac_data.entries)) {
664 iov_discard_front(&iov, &iov_cnt, s);
666 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
670 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
671 s = iov_to_buf(iov, iov_cnt, 0, macs,
672 mac_data.entries * ETH_ALEN);
673 if (s != mac_data.entries * ETH_ALEN) {
676 in_use += mac_data.entries;
681 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
683 first_multi = in_use;
685 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
686 sizeof(mac_data.entries));
687 mac_data.entries = virtio_ldl_p(vdev, &mac_data.entries);
688 if (s != sizeof(mac_data.entries)) {
692 iov_discard_front(&iov, &iov_cnt, s);
694 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
698 if (mac_data.entries <= MAC_TABLE_ENTRIES - in_use) {
699 s = iov_to_buf(iov, iov_cnt, 0, &macs[in_use * ETH_ALEN],
700 mac_data.entries * ETH_ALEN);
701 if (s != mac_data.entries * ETH_ALEN) {
704 in_use += mac_data.entries;
709 n->mac_table.in_use = in_use;
710 n->mac_table.first_multi = first_multi;
711 n->mac_table.uni_overflow = uni_overflow;
712 n->mac_table.multi_overflow = multi_overflow;
713 memcpy(n->mac_table.macs, macs, MAC_TABLE_ENTRIES * ETH_ALEN);
717 return VIRTIO_NET_OK;
721 return VIRTIO_NET_ERR;
724 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
725 struct iovec *iov, unsigned int iov_cnt)
727 VirtIODevice *vdev = VIRTIO_DEVICE(n);
730 NetClientState *nc = qemu_get_queue(n->nic);
732 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
733 vid = virtio_lduw_p(vdev, &vid);
734 if (s != sizeof(vid)) {
735 return VIRTIO_NET_ERR;
739 return VIRTIO_NET_ERR;
741 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
742 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
743 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
744 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
746 return VIRTIO_NET_ERR;
750 return VIRTIO_NET_OK;
753 static int virtio_net_handle_announce(VirtIONet *n, uint8_t cmd,
754 struct iovec *iov, unsigned int iov_cnt)
756 if (cmd == VIRTIO_NET_CTRL_ANNOUNCE_ACK &&
757 n->status & VIRTIO_NET_S_ANNOUNCE) {
758 n->status &= ~VIRTIO_NET_S_ANNOUNCE;
759 if (n->announce_counter) {
760 timer_mod(n->announce_timer,
761 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
762 self_announce_delay(n->announce_counter));
764 return VIRTIO_NET_OK;
766 return VIRTIO_NET_ERR;
770 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
771 struct iovec *iov, unsigned int iov_cnt)
773 VirtIODevice *vdev = VIRTIO_DEVICE(n);
774 struct virtio_net_ctrl_mq mq;
778 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
779 if (s != sizeof(mq)) {
780 return VIRTIO_NET_ERR;
783 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
784 return VIRTIO_NET_ERR;
787 queues = virtio_lduw_p(vdev, &mq.virtqueue_pairs);
789 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
790 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
791 queues > n->max_queues ||
793 return VIRTIO_NET_ERR;
796 n->curr_queues = queues;
797 /* stop the backend before changing the number of queues to avoid handling a
799 virtio_net_set_status(vdev, vdev->status);
800 virtio_net_set_queues(n);
802 return VIRTIO_NET_OK;
804 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
806 VirtIONet *n = VIRTIO_NET(vdev);
807 struct virtio_net_ctrl_hdr ctrl;
808 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
809 VirtQueueElement elem;
811 struct iovec *iov, *iov2;
812 unsigned int iov_cnt;
814 while (virtqueue_pop(vq, &elem)) {
815 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) ||
816 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
817 error_report("virtio-net ctrl missing headers");
821 iov_cnt = elem.out_num;
822 iov2 = iov = g_memdup(elem.out_sg, sizeof(struct iovec) * elem.out_num);
823 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
824 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
825 if (s != sizeof(ctrl)) {
826 status = VIRTIO_NET_ERR;
827 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
828 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
829 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
830 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
831 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
832 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
833 } else if (ctrl.class == VIRTIO_NET_CTRL_ANNOUNCE) {
834 status = virtio_net_handle_announce(n, ctrl.cmd, iov, iov_cnt);
835 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
836 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
837 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
838 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
841 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
842 assert(s == sizeof(status));
844 virtqueue_push(vq, &elem, sizeof(status));
845 virtio_notify(vdev, vq);
852 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
854 VirtIONet *n = VIRTIO_NET(vdev);
855 int queue_index = vq2q(virtio_get_queue_index(vq));
857 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
860 static int virtio_net_can_receive(NetClientState *nc)
862 VirtIONet *n = qemu_get_nic_opaque(nc);
863 VirtIODevice *vdev = VIRTIO_DEVICE(n);
864 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
866 if (!vdev->vm_running) {
870 if (nc->queue_index >= n->curr_queues) {
874 if (!virtio_queue_ready(q->rx_vq) ||
875 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
882 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
885 if (virtio_queue_empty(q->rx_vq) ||
886 (n->mergeable_rx_bufs &&
887 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
888 virtio_queue_set_notification(q->rx_vq, 1);
890 /* To avoid a race condition where the guest has made some buffers
891 * available after the above check but before notification was
892 * enabled, check for available buffers again.
894 if (virtio_queue_empty(q->rx_vq) ||
895 (n->mergeable_rx_bufs &&
896 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
901 virtio_queue_set_notification(q->rx_vq, 0);
905 static void virtio_net_hdr_swap(VirtIODevice *vdev, struct virtio_net_hdr *hdr)
907 virtio_tswap16s(vdev, &hdr->hdr_len);
908 virtio_tswap16s(vdev, &hdr->gso_size);
909 virtio_tswap16s(vdev, &hdr->csum_start);
910 virtio_tswap16s(vdev, &hdr->csum_offset);
913 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
914 * it never finds out that the packets don't have valid checksums. This
915 * causes dhclient to get upset. Fedora's carried a patch for ages to
916 * fix this with Xen but it hasn't appeared in an upstream release of
919 * To avoid breaking existing guests, we catch udp packets and add
920 * checksums. This is terrible but it's better than hacking the guest
923 * N.B. if we introduce a zero-copy API, this operation is no longer free so
924 * we should provide a mechanism to disable it to avoid polluting the host
927 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
928 uint8_t *buf, size_t size)
930 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
931 (size > 27 && size < 1500) && /* normal sized MTU */
932 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
933 (buf[23] == 17) && /* ip.protocol == UDP */
934 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
935 net_checksum_calculate(buf, size);
936 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
940 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
941 const void *buf, size_t size)
943 if (n->has_vnet_hdr) {
944 /* FIXME this cast is evil */
945 void *wbuf = (void *)buf;
946 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
947 size - n->host_hdr_len);
948 virtio_net_hdr_swap(VIRTIO_DEVICE(n), wbuf);
949 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
951 struct virtio_net_hdr hdr = {
953 .gso_type = VIRTIO_NET_HDR_GSO_NONE
955 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
959 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
961 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
962 static const uint8_t vlan[] = {0x81, 0x00};
963 uint8_t *ptr = (uint8_t *)buf;
969 ptr += n->host_hdr_len;
971 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
972 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
973 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
977 if (ptr[0] & 1) { // multicast
978 if (!memcmp(ptr, bcast, sizeof(bcast))) {
980 } else if (n->nomulti) {
982 } else if (n->allmulti || n->mac_table.multi_overflow) {
986 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
987 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
994 } else if (n->alluni || n->mac_table.uni_overflow) {
996 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
1000 for (i = 0; i < n->mac_table.first_multi; i++) {
1001 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
1010 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
1012 VirtIONet *n = qemu_get_nic_opaque(nc);
1013 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1014 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1015 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
1016 struct virtio_net_hdr_mrg_rxbuf mhdr;
1017 unsigned mhdr_cnt = 0;
1018 size_t offset, i, guest_offset;
1020 if (!virtio_net_can_receive(nc)) {
1024 /* hdr_len refers to the header we supply to the guest */
1025 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
1029 if (!receive_filter(n, buf, size))
1034 while (offset < size) {
1035 VirtQueueElement elem;
1037 const struct iovec *sg = elem.in_sg;
1041 if (virtqueue_pop(q->rx_vq, &elem) == 0) {
1044 error_report("virtio-net unexpected empty queue: "
1045 "i %zd mergeable %d offset %zd, size %zd, "
1046 "guest hdr len %zd, host hdr len %zd "
1047 "guest features 0x%" PRIx64,
1048 i, n->mergeable_rx_bufs, offset, size,
1049 n->guest_hdr_len, n->host_hdr_len,
1050 vdev->guest_features);
1054 if (elem.in_num < 1) {
1055 error_report("virtio-net receive queue contains no in buffers");
1060 assert(offset == 0);
1061 if (n->mergeable_rx_bufs) {
1062 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
1064 offsetof(typeof(mhdr), num_buffers),
1065 sizeof(mhdr.num_buffers));
1068 receive_header(n, sg, elem.in_num, buf, size);
1069 offset = n->host_hdr_len;
1070 total += n->guest_hdr_len;
1071 guest_offset = n->guest_hdr_len;
1076 /* copy in packet. ugh */
1077 len = iov_from_buf(sg, elem.in_num, guest_offset,
1078 buf + offset, size - offset);
1081 /* If buffers can't be merged, at this point we
1082 * must have consumed the complete packet.
1083 * Otherwise, drop it. */
1084 if (!n->mergeable_rx_bufs && offset < size) {
1086 error_report("virtio-net truncated non-mergeable packet: "
1087 "i %zd mergeable %d offset %zd, size %zd, "
1088 "guest hdr len %zd, host hdr len %zd",
1089 i, n->mergeable_rx_bufs,
1090 offset, size, n->guest_hdr_len, n->host_hdr_len);
1095 /* signal other side */
1096 virtqueue_fill(q->rx_vq, &elem, total, i++);
1100 virtio_stw_p(vdev, &mhdr.num_buffers, i);
1101 iov_from_buf(mhdr_sg, mhdr_cnt,
1103 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1106 virtqueue_flush(q->rx_vq, i);
1107 virtio_notify(vdev, q->rx_vq);
1112 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1114 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1116 VirtIONet *n = qemu_get_nic_opaque(nc);
1117 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1118 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1120 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
1121 virtio_notify(vdev, q->tx_vq);
1123 q->async_tx.elem.out_num = q->async_tx.len = 0;
1125 virtio_queue_set_notification(q->tx_vq, 1);
1126 virtio_net_flush_tx(q);
1130 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1132 VirtIONet *n = q->n;
1133 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1134 VirtQueueElement elem;
1135 int32_t num_packets = 0;
1136 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1137 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1141 if (q->async_tx.elem.out_num) {
1142 virtio_queue_set_notification(q->tx_vq, 0);
1146 while (virtqueue_pop(q->tx_vq, &elem)) {
1148 unsigned int out_num = elem.out_num;
1149 struct iovec *out_sg = &elem.out_sg[0];
1150 struct iovec sg[VIRTQUEUE_MAX_SIZE];
1153 error_report("virtio-net header not in first element");
1157 if (n->has_vnet_hdr) {
1158 if (out_sg[0].iov_len < n->guest_hdr_len) {
1159 error_report("virtio-net header incorrect");
1162 virtio_net_hdr_swap(vdev, (void *) out_sg[0].iov_base);
1166 * If host wants to see the guest header as is, we can
1167 * pass it on unchanged. Otherwise, copy just the parts
1168 * that host is interested in.
1170 assert(n->host_hdr_len <= n->guest_hdr_len);
1171 if (n->host_hdr_len != n->guest_hdr_len) {
1172 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1174 0, n->host_hdr_len);
1175 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1177 n->guest_hdr_len, -1);
1182 len = n->guest_hdr_len;
1184 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1185 out_sg, out_num, virtio_net_tx_complete);
1187 virtio_queue_set_notification(q->tx_vq, 0);
1188 q->async_tx.elem = elem;
1189 q->async_tx.len = len;
1195 virtqueue_push(q->tx_vq, &elem, 0);
1196 virtio_notify(vdev, q->tx_vq);
1198 if (++num_packets >= n->tx_burst) {
1205 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1207 VirtIONet *n = VIRTIO_NET(vdev);
1208 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1210 /* This happens when device was stopped but VCPU wasn't. */
1211 if (!vdev->vm_running) {
1216 if (q->tx_waiting) {
1217 virtio_queue_set_notification(vq, 1);
1218 timer_del(q->tx_timer);
1220 virtio_net_flush_tx(q);
1222 timer_mod(q->tx_timer,
1223 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1225 virtio_queue_set_notification(vq, 0);
1229 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1231 VirtIONet *n = VIRTIO_NET(vdev);
1232 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1234 if (unlikely(q->tx_waiting)) {
1238 /* This happens when device was stopped but VCPU wasn't. */
1239 if (!vdev->vm_running) {
1242 virtio_queue_set_notification(vq, 0);
1243 qemu_bh_schedule(q->tx_bh);
1246 static void virtio_net_tx_timer(void *opaque)
1248 VirtIONetQueue *q = opaque;
1249 VirtIONet *n = q->n;
1250 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1251 /* This happens when device was stopped but BH wasn't. */
1252 if (!vdev->vm_running) {
1253 /* Make sure tx waiting is set, so we'll run when restarted. */
1254 assert(q->tx_waiting);
1260 /* Just in case the driver is not ready on more */
1261 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1265 virtio_queue_set_notification(q->tx_vq, 1);
1266 virtio_net_flush_tx(q);
1269 static void virtio_net_tx_bh(void *opaque)
1271 VirtIONetQueue *q = opaque;
1272 VirtIONet *n = q->n;
1273 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1276 /* This happens when device was stopped but BH wasn't. */
1277 if (!vdev->vm_running) {
1278 /* Make sure tx waiting is set, so we'll run when restarted. */
1279 assert(q->tx_waiting);
1285 /* Just in case the driver is not ready on more */
1286 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1290 ret = virtio_net_flush_tx(q);
1291 if (ret == -EBUSY) {
1292 return; /* Notification re-enable handled by tx_complete */
1295 /* If we flush a full burst of packets, assume there are
1296 * more coming and immediately reschedule */
1297 if (ret >= n->tx_burst) {
1298 qemu_bh_schedule(q->tx_bh);
1303 /* If less than a full burst, re-enable notification and flush
1304 * anything that may have come in while we weren't looking. If
1305 * we find something, assume the guest is still active and reschedule */
1306 virtio_queue_set_notification(q->tx_vq, 1);
1307 if (virtio_net_flush_tx(q) > 0) {
1308 virtio_queue_set_notification(q->tx_vq, 0);
1309 qemu_bh_schedule(q->tx_bh);
1314 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1316 n->multiqueue = multiqueue;
1318 virtio_net_set_queues(n);
1321 static void virtio_net_save(QEMUFile *f, void *opaque)
1323 VirtIONet *n = opaque;
1324 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1326 /* At this point, backend must be stopped, otherwise
1327 * it might keep writing to memory. */
1328 assert(!n->vhost_started);
1329 virtio_save(vdev, f);
1332 static void virtio_net_save_device(VirtIODevice *vdev, QEMUFile *f)
1334 VirtIONet *n = VIRTIO_NET(vdev);
1337 qemu_put_buffer(f, n->mac, ETH_ALEN);
1338 qemu_put_be32(f, n->vqs[0].tx_waiting);
1339 qemu_put_be32(f, n->mergeable_rx_bufs);
1340 qemu_put_be16(f, n->status);
1341 qemu_put_byte(f, n->promisc);
1342 qemu_put_byte(f, n->allmulti);
1343 qemu_put_be32(f, n->mac_table.in_use);
1344 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
1345 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1346 qemu_put_be32(f, n->has_vnet_hdr);
1347 qemu_put_byte(f, n->mac_table.multi_overflow);
1348 qemu_put_byte(f, n->mac_table.uni_overflow);
1349 qemu_put_byte(f, n->alluni);
1350 qemu_put_byte(f, n->nomulti);
1351 qemu_put_byte(f, n->nouni);
1352 qemu_put_byte(f, n->nobcast);
1353 qemu_put_byte(f, n->has_ufo);
1354 if (n->max_queues > 1) {
1355 qemu_put_be16(f, n->max_queues);
1356 qemu_put_be16(f, n->curr_queues);
1357 for (i = 1; i < n->curr_queues; i++) {
1358 qemu_put_be32(f, n->vqs[i].tx_waiting);
1362 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1363 qemu_put_be64(f, n->curr_guest_offloads);
1367 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
1369 VirtIONet *n = opaque;
1370 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1372 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
1375 return virtio_load(vdev, f, version_id);
1378 static int virtio_net_load_device(VirtIODevice *vdev, QEMUFile *f,
1381 VirtIONet *n = VIRTIO_NET(vdev);
1384 qemu_get_buffer(f, n->mac, ETH_ALEN);
1385 n->vqs[0].tx_waiting = qemu_get_be32(f);
1387 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f),
1388 virtio_has_feature(vdev, VIRTIO_F_VERSION_1));
1390 if (version_id >= 3)
1391 n->status = qemu_get_be16(f);
1393 if (version_id >= 4) {
1394 if (version_id < 8) {
1395 n->promisc = qemu_get_be32(f);
1396 n->allmulti = qemu_get_be32(f);
1398 n->promisc = qemu_get_byte(f);
1399 n->allmulti = qemu_get_byte(f);
1403 if (version_id >= 5) {
1404 n->mac_table.in_use = qemu_get_be32(f);
1405 /* MAC_TABLE_ENTRIES may be different from the saved image */
1406 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
1407 qemu_get_buffer(f, n->mac_table.macs,
1408 n->mac_table.in_use * ETH_ALEN);
1412 /* Overflow detected - can happen if source has a larger MAC table.
1413 * We simply set overflow flag so there's no need to maintain the
1414 * table of addresses, discard them all.
1415 * Note: 64 bit math to avoid integer overflow.
1417 for (i = 0; i < (int64_t)n->mac_table.in_use * ETH_ALEN; ++i) {
1420 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
1421 n->mac_table.in_use = 0;
1425 if (version_id >= 6)
1426 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1428 if (version_id >= 7) {
1429 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
1430 error_report("virtio-net: saved image requires vnet_hdr=on");
1435 if (version_id >= 9) {
1436 n->mac_table.multi_overflow = qemu_get_byte(f);
1437 n->mac_table.uni_overflow = qemu_get_byte(f);
1440 if (version_id >= 10) {
1441 n->alluni = qemu_get_byte(f);
1442 n->nomulti = qemu_get_byte(f);
1443 n->nouni = qemu_get_byte(f);
1444 n->nobcast = qemu_get_byte(f);
1447 if (version_id >= 11) {
1448 if (qemu_get_byte(f) && !peer_has_ufo(n)) {
1449 error_report("virtio-net: saved image requires TUN_F_UFO support");
1454 if (n->max_queues > 1) {
1455 if (n->max_queues != qemu_get_be16(f)) {
1456 error_report("virtio-net: different max_queues ");
1460 n->curr_queues = qemu_get_be16(f);
1461 if (n->curr_queues > n->max_queues) {
1462 error_report("virtio-net: curr_queues %x > max_queues %x",
1463 n->curr_queues, n->max_queues);
1466 for (i = 1; i < n->curr_queues; i++) {
1467 n->vqs[i].tx_waiting = qemu_get_be32(f);
1471 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
1472 n->curr_guest_offloads = qemu_get_be64(f);
1474 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1477 if (peer_has_vnet_hdr(n)) {
1478 virtio_net_apply_guest_offloads(n);
1481 virtio_net_set_queues(n);
1483 /* Find the first multicast entry in the saved MAC filter */
1484 for (i = 0; i < n->mac_table.in_use; i++) {
1485 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1489 n->mac_table.first_multi = i;
1491 /* nc.link_down can't be migrated, so infer link_down according
1492 * to link status bit in n->status */
1493 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1494 for (i = 0; i < n->max_queues; i++) {
1495 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1498 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE) &&
1499 virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) {
1500 n->announce_counter = SELF_ANNOUNCE_ROUNDS;
1501 timer_mod(n->announce_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL));
1507 static NetClientInfo net_virtio_info = {
1508 .type = NET_CLIENT_OPTIONS_KIND_NIC,
1509 .size = sizeof(NICState),
1510 .can_receive = virtio_net_can_receive,
1511 .receive = virtio_net_receive,
1512 .link_status_changed = virtio_net_set_link_status,
1513 .query_rx_filter = virtio_net_query_rxfilter,
1516 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1518 VirtIONet *n = VIRTIO_NET(vdev);
1519 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1520 assert(n->vhost_started);
1521 return vhost_net_virtqueue_pending(get_vhost_net(nc->peer), idx);
1524 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
1527 VirtIONet *n = VIRTIO_NET(vdev);
1528 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1529 assert(n->vhost_started);
1530 vhost_net_virtqueue_mask(get_vhost_net(nc->peer),
1534 static void virtio_net_set_config_size(VirtIONet *n, uint64_t host_features)
1536 int i, config_size = 0;
1537 virtio_add_feature(&host_features, VIRTIO_NET_F_MAC);
1538 for (i = 0; feature_sizes[i].flags != 0; i++) {
1539 if (host_features & feature_sizes[i].flags) {
1540 config_size = MAX(feature_sizes[i].end, config_size);
1543 n->config_size = config_size;
1546 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1550 * The name can be NULL, the netclient name will be type.x.
1552 assert(type != NULL);
1554 g_free(n->netclient_name);
1555 g_free(n->netclient_type);
1556 n->netclient_name = g_strdup(name);
1557 n->netclient_type = g_strdup(type);
1560 static void virtio_net_device_realize(DeviceState *dev, Error **errp)
1562 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1563 VirtIONet *n = VIRTIO_NET(dev);
1567 virtio_net_set_config_size(n, n->host_features);
1568 virtio_init(vdev, "virtio-net", VIRTIO_ID_NET, n->config_size);
1570 n->max_queues = MAX(n->nic_conf.peers.queues, 1);
1571 if (n->max_queues * 2 + 1 > VIRTIO_QUEUE_MAX) {
1572 error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
1573 "must be a positive integer less than %d.",
1574 n->max_queues, (VIRTIO_QUEUE_MAX - 1) / 2);
1575 virtio_cleanup(vdev);
1578 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
1580 n->tx_timeout = n->net_conf.txtimer;
1582 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
1583 && strcmp(n->net_conf.tx, "bh")) {
1584 error_report("virtio-net: "
1585 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1587 error_report("Defaulting to \"bh\"");
1590 for (i = 0; i < n->max_queues; i++) {
1591 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1592 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1594 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
1595 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1596 virtio_net_tx_timer,
1600 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
1601 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]);
1604 n->vqs[i].tx_waiting = 0;
1608 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1609 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
1610 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
1611 n->status = VIRTIO_NET_S_LINK_UP;
1612 n->announce_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
1613 virtio_net_announce_timer, n);
1615 if (n->netclient_type) {
1617 * Happen when virtio_net_set_netclient_name has been called.
1619 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1620 n->netclient_type, n->netclient_name, n);
1622 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1623 object_get_typename(OBJECT(dev)), dev->id, n);
1626 peer_test_vnet_hdr(n);
1627 if (peer_has_vnet_hdr(n)) {
1628 for (i = 0; i < n->max_queues; i++) {
1629 qemu_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
1631 n->host_hdr_len = sizeof(struct virtio_net_hdr);
1633 n->host_hdr_len = 0;
1636 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
1638 n->vqs[0].tx_waiting = 0;
1639 n->tx_burst = n->net_conf.txburst;
1640 virtio_net_set_mrg_rx_bufs(n, 0, 0);
1641 n->promisc = 1; /* for compatibility */
1643 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1645 n->vlans = g_malloc0(MAX_VLAN >> 3);
1647 nc = qemu_get_queue(n->nic);
1648 nc->rxfilter_notify_enabled = 1;
1651 register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
1652 virtio_net_save, virtio_net_load, n);
1655 static void virtio_net_device_unrealize(DeviceState *dev, Error **errp)
1657 VirtIODevice *vdev = VIRTIO_DEVICE(dev);
1658 VirtIONet *n = VIRTIO_NET(dev);
1661 /* This will stop vhost backend if appropriate. */
1662 virtio_net_set_status(vdev, 0);
1664 unregister_savevm(dev, "virtio-net", n);
1666 g_free(n->netclient_name);
1667 n->netclient_name = NULL;
1668 g_free(n->netclient_type);
1669 n->netclient_type = NULL;
1671 g_free(n->mac_table.macs);
1674 for (i = 0; i < n->max_queues; i++) {
1675 VirtIONetQueue *q = &n->vqs[i];
1676 NetClientState *nc = qemu_get_subqueue(n->nic, i);
1678 qemu_purge_queued_packets(nc);
1681 timer_del(q->tx_timer);
1682 timer_free(q->tx_timer);
1683 } else if (q->tx_bh) {
1684 qemu_bh_delete(q->tx_bh);
1688 timer_del(n->announce_timer);
1689 timer_free(n->announce_timer);
1691 qemu_del_nic(n->nic);
1692 virtio_cleanup(vdev);
1695 static void virtio_net_instance_init(Object *obj)
1697 VirtIONet *n = VIRTIO_NET(obj);
1700 * The default config_size is sizeof(struct virtio_net_config).
1701 * Can be overriden with virtio_net_set_config_size.
1703 n->config_size = sizeof(struct virtio_net_config);
1704 device_add_bootindex_property(obj, &n->nic_conf.bootindex,
1705 "bootindex", "/ethernet-phy@0",
1709 static Property virtio_net_properties[] = {
1710 DEFINE_PROP_BIT("any_layout", VirtIONet, host_features,
1711 VIRTIO_F_ANY_LAYOUT, true),
1712 DEFINE_PROP_BIT("csum", VirtIONet, host_features, VIRTIO_NET_F_CSUM, true),
1713 DEFINE_PROP_BIT("guest_csum", VirtIONet, host_features,
1714 VIRTIO_NET_F_GUEST_CSUM, true),
1715 DEFINE_PROP_BIT("gso", VirtIONet, host_features, VIRTIO_NET_F_GSO, true),
1716 DEFINE_PROP_BIT("guest_tso4", VirtIONet, host_features,
1717 VIRTIO_NET_F_GUEST_TSO4, true),
1718 DEFINE_PROP_BIT("guest_tso6", VirtIONet, host_features,
1719 VIRTIO_NET_F_GUEST_TSO6, true),
1720 DEFINE_PROP_BIT("guest_ecn", VirtIONet, host_features,
1721 VIRTIO_NET_F_GUEST_ECN, true),
1722 DEFINE_PROP_BIT("guest_ufo", VirtIONet, host_features,
1723 VIRTIO_NET_F_GUEST_UFO, true),
1724 DEFINE_PROP_BIT("guest_announce", VirtIONet, host_features,
1725 VIRTIO_NET_F_GUEST_ANNOUNCE, true),
1726 DEFINE_PROP_BIT("host_tso4", VirtIONet, host_features,
1727 VIRTIO_NET_F_HOST_TSO4, true),
1728 DEFINE_PROP_BIT("host_tso6", VirtIONet, host_features,
1729 VIRTIO_NET_F_HOST_TSO6, true),
1730 DEFINE_PROP_BIT("host_ecn", VirtIONet, host_features,
1731 VIRTIO_NET_F_HOST_ECN, true),
1732 DEFINE_PROP_BIT("host_ufo", VirtIONet, host_features,
1733 VIRTIO_NET_F_HOST_UFO, true),
1734 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet, host_features,
1735 VIRTIO_NET_F_MRG_RXBUF, true),
1736 DEFINE_PROP_BIT("status", VirtIONet, host_features,
1737 VIRTIO_NET_F_STATUS, true),
1738 DEFINE_PROP_BIT("ctrl_vq", VirtIONet, host_features,
1739 VIRTIO_NET_F_CTRL_VQ, true),
1740 DEFINE_PROP_BIT("ctrl_rx", VirtIONet, host_features,
1741 VIRTIO_NET_F_CTRL_RX, true),
1742 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet, host_features,
1743 VIRTIO_NET_F_CTRL_VLAN, true),
1744 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet, host_features,
1745 VIRTIO_NET_F_CTRL_RX_EXTRA, true),
1746 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet, host_features,
1747 VIRTIO_NET_F_CTRL_MAC_ADDR, true),
1748 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet, host_features,
1749 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, true),
1750 DEFINE_PROP_BIT("mq", VirtIONet, host_features, VIRTIO_NET_F_MQ, false),
1751 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
1752 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
1754 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
1755 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
1756 DEFINE_PROP_END_OF_LIST(),
1759 static void virtio_net_class_init(ObjectClass *klass, void *data)
1761 DeviceClass *dc = DEVICE_CLASS(klass);
1762 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1764 dc->props = virtio_net_properties;
1765 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1766 vdc->realize = virtio_net_device_realize;
1767 vdc->unrealize = virtio_net_device_unrealize;
1768 vdc->get_config = virtio_net_get_config;
1769 vdc->set_config = virtio_net_set_config;
1770 vdc->get_features = virtio_net_get_features;
1771 vdc->set_features = virtio_net_set_features;
1772 vdc->bad_features = virtio_net_bad_features;
1773 vdc->reset = virtio_net_reset;
1774 vdc->set_status = virtio_net_set_status;
1775 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
1776 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
1777 vdc->load = virtio_net_load_device;
1778 vdc->save = virtio_net_save_device;
1781 static const TypeInfo virtio_net_info = {
1782 .name = TYPE_VIRTIO_NET,
1783 .parent = TYPE_VIRTIO_DEVICE,
1784 .instance_size = sizeof(VirtIONet),
1785 .instance_init = virtio_net_instance_init,
1786 .class_init = virtio_net_class_init,
1789 static void virtio_register_types(void)
1791 type_register_static(&virtio_net_info);
1794 type_init(virtio_register_types)