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 "monitor/monitor.h"
27 #define VIRTIO_NET_VM_VERSION 11
29 #define MAC_TABLE_ENTRIES 64
30 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
33 * Calculate the number of bytes up to and including the given 'field' of
36 #define endof(container, field) \
37 (offsetof(container, field) + sizeof(((container *)0)->field))
39 typedef struct VirtIOFeature {
44 static VirtIOFeature feature_sizes[] = {
45 {.flags = 1 << VIRTIO_NET_F_MAC,
46 .end = endof(struct virtio_net_config, mac)},
47 {.flags = 1 << VIRTIO_NET_F_STATUS,
48 .end = endof(struct virtio_net_config, status)},
49 {.flags = 1 << VIRTIO_NET_F_MQ,
50 .end = endof(struct virtio_net_config, max_virtqueue_pairs)},
54 static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
56 VirtIONet *n = qemu_get_nic_opaque(nc);
58 return &n->vqs[nc->queue_index];
61 static int vq2q(int queue_index)
63 return queue_index / 2;
67 * - we could suppress RX interrupt if we were so inclined.
70 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
72 VirtIONet *n = VIRTIO_NET(vdev);
73 struct virtio_net_config netcfg;
75 stw_p(&netcfg.status, n->status);
76 stw_p(&netcfg.max_virtqueue_pairs, n->max_queues);
77 memcpy(netcfg.mac, n->mac, ETH_ALEN);
78 memcpy(config, &netcfg, n->config_size);
81 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
83 VirtIONet *n = VIRTIO_NET(vdev);
84 struct virtio_net_config netcfg = {};
86 memcpy(&netcfg, config, n->config_size);
88 if (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) &&
89 memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
90 memcpy(n->mac, netcfg.mac, ETH_ALEN);
91 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
95 static bool virtio_net_started(VirtIONet *n, uint8_t status)
97 VirtIODevice *vdev = VIRTIO_DEVICE(n);
98 return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
99 (n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
102 static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
104 VirtIODevice *vdev = VIRTIO_DEVICE(n);
105 NetClientState *nc = qemu_get_queue(n->nic);
106 int queues = n->multiqueue ? n->max_queues : 1;
111 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
115 if (!tap_get_vhost_net(nc->peer)) {
119 if (!!n->vhost_started ==
120 (virtio_net_started(n, status) && !nc->peer->link_down)) {
123 if (!n->vhost_started) {
125 if (!vhost_net_query(tap_get_vhost_net(nc->peer), vdev)) {
128 n->vhost_started = 1;
129 r = vhost_net_start(vdev, n->nic->ncs, queues);
131 error_report("unable to start vhost net: %d: "
132 "falling back on userspace virtio", -r);
133 n->vhost_started = 0;
136 vhost_net_stop(vdev, n->nic->ncs, queues);
137 n->vhost_started = 0;
141 static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
143 VirtIONet *n = VIRTIO_NET(vdev);
146 uint8_t queue_status;
148 virtio_net_vhost_status(n, status);
150 for (i = 0; i < n->max_queues; i++) {
153 if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
156 queue_status = status;
159 if (!q->tx_waiting) {
163 if (virtio_net_started(n, queue_status) && !n->vhost_started) {
165 timer_mod(q->tx_timer,
166 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
168 qemu_bh_schedule(q->tx_bh);
172 timer_del(q->tx_timer);
174 qemu_bh_cancel(q->tx_bh);
180 static void virtio_net_set_link_status(NetClientState *nc)
182 VirtIONet *n = qemu_get_nic_opaque(nc);
183 VirtIODevice *vdev = VIRTIO_DEVICE(n);
184 uint16_t old_status = n->status;
187 n->status &= ~VIRTIO_NET_S_LINK_UP;
189 n->status |= VIRTIO_NET_S_LINK_UP;
191 if (n->status != old_status)
192 virtio_notify_config(vdev);
194 virtio_net_set_status(vdev, vdev->status);
197 static void rxfilter_notify(NetClientState *nc)
200 VirtIONet *n = qemu_get_nic_opaque(nc);
202 if (nc->rxfilter_notify_enabled) {
203 if (n->netclient_name) {
204 event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
206 object_get_canonical_path(OBJECT(n->qdev)));
208 event_data = qobject_from_jsonf("{ 'path': %s }",
209 object_get_canonical_path(OBJECT(n->qdev)));
211 monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data);
212 qobject_decref(event_data);
214 /* disable event notification to avoid events flooding */
215 nc->rxfilter_notify_enabled = 0;
219 static char *mac_strdup_printf(const uint8_t *mac)
221 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", mac[0],
222 mac[1], mac[2], mac[3], mac[4], mac[5]);
225 static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
227 VirtIONet *n = qemu_get_nic_opaque(nc);
229 strList *str_list, *entry;
230 intList *int_list, *int_entry;
233 info = g_malloc0(sizeof(*info));
234 info->name = g_strdup(nc->name);
235 info->promiscuous = n->promisc;
238 info->unicast = RX_STATE_NONE;
239 } else if (n->alluni) {
240 info->unicast = RX_STATE_ALL;
242 info->unicast = RX_STATE_NORMAL;
246 info->multicast = RX_STATE_NONE;
247 } else if (n->allmulti) {
248 info->multicast = RX_STATE_ALL;
250 info->multicast = RX_STATE_NORMAL;
253 info->broadcast_allowed = n->nobcast;
254 info->multicast_overflow = n->mac_table.multi_overflow;
255 info->unicast_overflow = n->mac_table.uni_overflow;
257 info->main_mac = mac_strdup_printf(n->mac);
260 for (i = 0; i < n->mac_table.first_multi; i++) {
261 entry = g_malloc0(sizeof(*entry));
262 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
263 entry->next = str_list;
266 info->unicast_table = str_list;
269 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
270 entry = g_malloc0(sizeof(*entry));
271 entry->value = mac_strdup_printf(n->mac_table.macs + i * ETH_ALEN);
272 entry->next = str_list;
275 info->multicast_table = str_list;
278 for (i = 0; i < MAX_VLAN >> 5; i++) {
279 for (j = 0; n->vlans[i] && j < 0x1f; j++) {
280 if (n->vlans[i] & (1U << j)) {
281 int_entry = g_malloc0(sizeof(*int_entry));
282 int_entry->value = (i << 5) + j;
283 int_entry->next = int_list;
284 int_list = int_entry;
288 info->vlan_table = int_list;
290 /* enable event notification after query */
291 nc->rxfilter_notify_enabled = 1;
296 static void virtio_net_reset(VirtIODevice *vdev)
298 VirtIONet *n = VIRTIO_NET(vdev);
300 /* Reset back to compatibility mode */
307 /* multiqueue is disabled by default */
310 /* Flush any MAC and VLAN filter table state */
311 n->mac_table.in_use = 0;
312 n->mac_table.first_multi = 0;
313 n->mac_table.multi_overflow = 0;
314 n->mac_table.uni_overflow = 0;
315 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
316 memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
317 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
318 memset(n->vlans, 0, MAX_VLAN >> 3);
321 static void peer_test_vnet_hdr(VirtIONet *n)
323 NetClientState *nc = qemu_get_queue(n->nic);
328 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
332 n->has_vnet_hdr = tap_has_vnet_hdr(nc->peer);
335 static int peer_has_vnet_hdr(VirtIONet *n)
337 return n->has_vnet_hdr;
340 static int peer_has_ufo(VirtIONet *n)
342 if (!peer_has_vnet_hdr(n))
345 n->has_ufo = tap_has_ufo(qemu_get_queue(n->nic)->peer);
350 static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs)
355 n->mergeable_rx_bufs = mergeable_rx_bufs;
357 n->guest_hdr_len = n->mergeable_rx_bufs ?
358 sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
360 for (i = 0; i < n->max_queues; i++) {
361 nc = qemu_get_subqueue(n->nic, i);
363 if (peer_has_vnet_hdr(n) &&
364 tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
365 tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
366 n->host_hdr_len = n->guest_hdr_len;
371 static int peer_attach(VirtIONet *n, int index)
373 NetClientState *nc = qemu_get_subqueue(n->nic, index);
379 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
383 return tap_enable(nc->peer);
386 static int peer_detach(VirtIONet *n, int index)
388 NetClientState *nc = qemu_get_subqueue(n->nic, index);
394 if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
398 return tap_disable(nc->peer);
401 static void virtio_net_set_queues(VirtIONet *n)
405 for (i = 0; i < n->max_queues; i++) {
406 if (i < n->curr_queues) {
407 assert(!peer_attach(n, i));
409 assert(!peer_detach(n, i));
414 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
416 static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
418 VirtIONet *n = VIRTIO_NET(vdev);
419 NetClientState *nc = qemu_get_queue(n->nic);
421 features |= (1 << VIRTIO_NET_F_MAC);
423 if (!peer_has_vnet_hdr(n)) {
424 features &= ~(0x1 << VIRTIO_NET_F_CSUM);
425 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
426 features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
427 features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
429 features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
430 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
431 features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
432 features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
435 if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
436 features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
437 features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
440 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
443 if (!tap_get_vhost_net(nc->peer)) {
446 return vhost_net_get_features(tap_get_vhost_net(nc->peer), features);
449 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
451 uint32_t features = 0;
453 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
455 features |= (1 << VIRTIO_NET_F_MAC);
456 features |= (1 << VIRTIO_NET_F_CSUM);
457 features |= (1 << VIRTIO_NET_F_HOST_TSO4);
458 features |= (1 << VIRTIO_NET_F_HOST_TSO6);
459 features |= (1 << VIRTIO_NET_F_HOST_ECN);
464 static void virtio_net_apply_guest_offloads(VirtIONet *n)
466 tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
467 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_CSUM)),
468 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO4)),
469 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_TSO6)),
470 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_ECN)),
471 !!(n->curr_guest_offloads & (1ULL << VIRTIO_NET_F_GUEST_UFO)));
474 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features)
476 static const uint64_t guest_offloads_mask =
477 (1ULL << VIRTIO_NET_F_GUEST_CSUM) |
478 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |
479 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |
480 (1ULL << VIRTIO_NET_F_GUEST_ECN) |
481 (1ULL << VIRTIO_NET_F_GUEST_UFO);
483 return guest_offloads_mask & features;
486 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet *n)
488 VirtIODevice *vdev = VIRTIO_DEVICE(n);
489 return virtio_net_guest_offloads_by_features(vdev->guest_features);
492 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
494 VirtIONet *n = VIRTIO_NET(vdev);
497 virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)));
499 virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF)));
501 if (n->has_vnet_hdr) {
502 n->curr_guest_offloads =
503 virtio_net_guest_offloads_by_features(features);
504 virtio_net_apply_guest_offloads(n);
507 for (i = 0; i < n->max_queues; i++) {
508 NetClientState *nc = qemu_get_subqueue(n->nic, i);
510 if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
513 if (!tap_get_vhost_net(nc->peer)) {
516 vhost_net_ack_features(tap_get_vhost_net(nc->peer), features);
520 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
521 struct iovec *iov, unsigned int iov_cnt)
525 NetClientState *nc = qemu_get_queue(n->nic);
527 s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
528 if (s != sizeof(on)) {
529 return VIRTIO_NET_ERR;
532 if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
534 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
536 } else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
538 } else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
540 } else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
542 } else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
545 return VIRTIO_NET_ERR;
550 return VIRTIO_NET_OK;
553 static int virtio_net_handle_offloads(VirtIONet *n, uint8_t cmd,
554 struct iovec *iov, unsigned int iov_cnt)
556 VirtIODevice *vdev = VIRTIO_DEVICE(n);
560 if (!((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features)) {
561 return VIRTIO_NET_ERR;
564 s = iov_to_buf(iov, iov_cnt, 0, &offloads, sizeof(offloads));
565 if (s != sizeof(offloads)) {
566 return VIRTIO_NET_ERR;
569 if (cmd == VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET) {
570 uint64_t supported_offloads;
572 if (!n->has_vnet_hdr) {
573 return VIRTIO_NET_ERR;
576 supported_offloads = virtio_net_supported_guest_offloads(n);
577 if (offloads & ~supported_offloads) {
578 return VIRTIO_NET_ERR;
581 n->curr_guest_offloads = offloads;
582 virtio_net_apply_guest_offloads(n);
584 return VIRTIO_NET_OK;
586 return VIRTIO_NET_ERR;
590 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
591 struct iovec *iov, unsigned int iov_cnt)
593 struct virtio_net_ctrl_mac mac_data;
595 NetClientState *nc = qemu_get_queue(n->nic);
597 if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
598 if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
599 return VIRTIO_NET_ERR;
601 s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
602 assert(s == sizeof(n->mac));
603 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
606 return VIRTIO_NET_OK;
609 if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
610 return VIRTIO_NET_ERR;
613 n->mac_table.in_use = 0;
614 n->mac_table.first_multi = 0;
615 n->mac_table.uni_overflow = 0;
616 n->mac_table.multi_overflow = 0;
617 memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
619 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
620 sizeof(mac_data.entries));
621 mac_data.entries = ldl_p(&mac_data.entries);
622 if (s != sizeof(mac_data.entries)) {
625 iov_discard_front(&iov, &iov_cnt, s);
627 if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
631 if (mac_data.entries <= MAC_TABLE_ENTRIES) {
632 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
633 mac_data.entries * ETH_ALEN);
634 if (s != mac_data.entries * ETH_ALEN) {
637 n->mac_table.in_use += mac_data.entries;
639 n->mac_table.uni_overflow = 1;
642 iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
644 n->mac_table.first_multi = n->mac_table.in_use;
646 s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
647 sizeof(mac_data.entries));
648 mac_data.entries = ldl_p(&mac_data.entries);
649 if (s != sizeof(mac_data.entries)) {
653 iov_discard_front(&iov, &iov_cnt, s);
655 if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
659 if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
660 s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
661 mac_data.entries * ETH_ALEN);
662 if (s != mac_data.entries * ETH_ALEN) {
665 n->mac_table.in_use += mac_data.entries;
667 n->mac_table.multi_overflow = 1;
672 return VIRTIO_NET_OK;
676 return VIRTIO_NET_ERR;
679 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
680 struct iovec *iov, unsigned int iov_cnt)
684 NetClientState *nc = qemu_get_queue(n->nic);
686 s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
688 if (s != sizeof(vid)) {
689 return VIRTIO_NET_ERR;
693 return VIRTIO_NET_ERR;
695 if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
696 n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
697 else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
698 n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
700 return VIRTIO_NET_ERR;
704 return VIRTIO_NET_OK;
707 static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
708 struct iovec *iov, unsigned int iov_cnt)
710 VirtIODevice *vdev = VIRTIO_DEVICE(n);
711 struct virtio_net_ctrl_mq mq;
715 s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
716 if (s != sizeof(mq)) {
717 return VIRTIO_NET_ERR;
720 if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
721 return VIRTIO_NET_ERR;
724 queues = lduw_p(&mq.virtqueue_pairs);
726 if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
727 queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
728 queues > n->max_queues ||
730 return VIRTIO_NET_ERR;
733 n->curr_queues = queues;
734 /* stop the backend before changing the number of queues to avoid handling a
736 virtio_net_set_status(vdev, vdev->status);
737 virtio_net_set_queues(n);
739 return VIRTIO_NET_OK;
741 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
743 VirtIONet *n = VIRTIO_NET(vdev);
744 struct virtio_net_ctrl_hdr ctrl;
745 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
746 VirtQueueElement elem;
749 unsigned int iov_cnt;
751 while (virtqueue_pop(vq, &elem)) {
752 if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) ||
753 iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
754 error_report("virtio-net ctrl missing headers");
759 iov_cnt = elem.out_num;
760 s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
761 iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
762 if (s != sizeof(ctrl)) {
763 status = VIRTIO_NET_ERR;
764 } else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
765 status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
766 } else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
767 status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
768 } else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
769 status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
770 } else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
771 status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
772 } else if (ctrl.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS) {
773 status = virtio_net_handle_offloads(n, ctrl.cmd, iov, iov_cnt);
776 s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
777 assert(s == sizeof(status));
779 virtqueue_push(vq, &elem, sizeof(status));
780 virtio_notify(vdev, vq);
786 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
788 VirtIONet *n = VIRTIO_NET(vdev);
789 int queue_index = vq2q(virtio_get_queue_index(vq));
791 qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
794 static int virtio_net_can_receive(NetClientState *nc)
796 VirtIONet *n = qemu_get_nic_opaque(nc);
797 VirtIODevice *vdev = VIRTIO_DEVICE(n);
798 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
800 if (!vdev->vm_running) {
804 if (nc->queue_index >= n->curr_queues) {
808 if (!virtio_queue_ready(q->rx_vq) ||
809 !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
816 static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
819 if (virtio_queue_empty(q->rx_vq) ||
820 (n->mergeable_rx_bufs &&
821 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
822 virtio_queue_set_notification(q->rx_vq, 1);
824 /* To avoid a race condition where the guest has made some buffers
825 * available after the above check but before notification was
826 * enabled, check for available buffers again.
828 if (virtio_queue_empty(q->rx_vq) ||
829 (n->mergeable_rx_bufs &&
830 !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
835 virtio_queue_set_notification(q->rx_vq, 0);
839 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
840 * it never finds out that the packets don't have valid checksums. This
841 * causes dhclient to get upset. Fedora's carried a patch for ages to
842 * fix this with Xen but it hasn't appeared in an upstream release of
845 * To avoid breaking existing guests, we catch udp packets and add
846 * checksums. This is terrible but it's better than hacking the guest
849 * N.B. if we introduce a zero-copy API, this operation is no longer free so
850 * we should provide a mechanism to disable it to avoid polluting the host
853 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
854 uint8_t *buf, size_t size)
856 if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
857 (size > 27 && size < 1500) && /* normal sized MTU */
858 (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
859 (buf[23] == 17) && /* ip.protocol == UDP */
860 (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
861 net_checksum_calculate(buf, size);
862 hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
866 static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
867 const void *buf, size_t size)
869 if (n->has_vnet_hdr) {
870 /* FIXME this cast is evil */
871 void *wbuf = (void *)buf;
872 work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
873 size - n->host_hdr_len);
874 iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
876 struct virtio_net_hdr hdr = {
878 .gso_type = VIRTIO_NET_HDR_GSO_NONE
880 iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
884 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
886 static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
887 static const uint8_t vlan[] = {0x81, 0x00};
888 uint8_t *ptr = (uint8_t *)buf;
894 ptr += n->host_hdr_len;
896 if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
897 int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
898 if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
902 if (ptr[0] & 1) { // multicast
903 if (!memcmp(ptr, bcast, sizeof(bcast))) {
905 } else if (n->nomulti) {
907 } else if (n->allmulti || n->mac_table.multi_overflow) {
911 for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
912 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
919 } else if (n->alluni || n->mac_table.uni_overflow) {
921 } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
925 for (i = 0; i < n->mac_table.first_multi; i++) {
926 if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
935 static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
937 VirtIONet *n = qemu_get_nic_opaque(nc);
938 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
939 VirtIODevice *vdev = VIRTIO_DEVICE(n);
940 struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
941 struct virtio_net_hdr_mrg_rxbuf mhdr;
942 unsigned mhdr_cnt = 0;
943 size_t offset, i, guest_offset;
945 if (!virtio_net_can_receive(nc)) {
949 /* hdr_len refers to the header we supply to the guest */
950 if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
954 if (!receive_filter(n, buf, size))
959 while (offset < size) {
960 VirtQueueElement elem;
962 const struct iovec *sg = elem.in_sg;
966 if (virtqueue_pop(q->rx_vq, &elem) == 0) {
969 error_report("virtio-net unexpected empty queue: "
970 "i %zd mergeable %d offset %zd, size %zd, "
971 "guest hdr len %zd, host hdr len %zd guest features 0x%x",
972 i, n->mergeable_rx_bufs, offset, size,
973 n->guest_hdr_len, n->host_hdr_len, vdev->guest_features);
977 if (elem.in_num < 1) {
978 error_report("virtio-net receive queue contains no in buffers");
984 if (n->mergeable_rx_bufs) {
985 mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
987 offsetof(typeof(mhdr), num_buffers),
988 sizeof(mhdr.num_buffers));
991 receive_header(n, sg, elem.in_num, buf, size);
992 offset = n->host_hdr_len;
993 total += n->guest_hdr_len;
994 guest_offset = n->guest_hdr_len;
999 /* copy in packet. ugh */
1000 len = iov_from_buf(sg, elem.in_num, guest_offset,
1001 buf + offset, size - offset);
1004 /* If buffers can't be merged, at this point we
1005 * must have consumed the complete packet.
1006 * Otherwise, drop it. */
1007 if (!n->mergeable_rx_bufs && offset < size) {
1009 error_report("virtio-net truncated non-mergeable packet: "
1010 "i %zd mergeable %d offset %zd, size %zd, "
1011 "guest hdr len %zd, host hdr len %zd",
1012 i, n->mergeable_rx_bufs,
1013 offset, size, n->guest_hdr_len, n->host_hdr_len);
1018 /* signal other side */
1019 virtqueue_fill(q->rx_vq, &elem, total, i++);
1023 stw_p(&mhdr.num_buffers, i);
1024 iov_from_buf(mhdr_sg, mhdr_cnt,
1026 &mhdr.num_buffers, sizeof mhdr.num_buffers);
1029 virtqueue_flush(q->rx_vq, i);
1030 virtio_notify(vdev, q->rx_vq);
1035 static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
1037 static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
1039 VirtIONet *n = qemu_get_nic_opaque(nc);
1040 VirtIONetQueue *q = virtio_net_get_subqueue(nc);
1041 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1043 virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
1044 virtio_notify(vdev, q->tx_vq);
1046 q->async_tx.elem.out_num = q->async_tx.len = 0;
1048 virtio_queue_set_notification(q->tx_vq, 1);
1049 virtio_net_flush_tx(q);
1053 static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
1055 VirtIONet *n = q->n;
1056 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1057 VirtQueueElement elem;
1058 int32_t num_packets = 0;
1059 int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
1060 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1064 assert(vdev->vm_running);
1066 if (q->async_tx.elem.out_num) {
1067 virtio_queue_set_notification(q->tx_vq, 0);
1071 while (virtqueue_pop(q->tx_vq, &elem)) {
1073 unsigned int out_num = elem.out_num;
1074 struct iovec *out_sg = &elem.out_sg[0];
1075 struct iovec sg[VIRTQUEUE_MAX_SIZE];
1078 error_report("virtio-net header not in first element");
1083 * If host wants to see the guest header as is, we can
1084 * pass it on unchanged. Otherwise, copy just the parts
1085 * that host is interested in.
1087 assert(n->host_hdr_len <= n->guest_hdr_len);
1088 if (n->host_hdr_len != n->guest_hdr_len) {
1089 unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
1091 0, n->host_hdr_len);
1092 sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
1094 n->guest_hdr_len, -1);
1099 len = n->guest_hdr_len;
1101 ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
1102 out_sg, out_num, virtio_net_tx_complete);
1104 virtio_queue_set_notification(q->tx_vq, 0);
1105 q->async_tx.elem = elem;
1106 q->async_tx.len = len;
1112 virtqueue_push(q->tx_vq, &elem, 0);
1113 virtio_notify(vdev, q->tx_vq);
1115 if (++num_packets >= n->tx_burst) {
1122 static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
1124 VirtIONet *n = VIRTIO_NET(vdev);
1125 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1127 /* This happens when device was stopped but VCPU wasn't. */
1128 if (!vdev->vm_running) {
1133 if (q->tx_waiting) {
1134 virtio_queue_set_notification(vq, 1);
1135 timer_del(q->tx_timer);
1137 virtio_net_flush_tx(q);
1139 timer_mod(q->tx_timer,
1140 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_timeout);
1142 virtio_queue_set_notification(vq, 0);
1146 static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
1148 VirtIONet *n = VIRTIO_NET(vdev);
1149 VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
1151 if (unlikely(q->tx_waiting)) {
1155 /* This happens when device was stopped but VCPU wasn't. */
1156 if (!vdev->vm_running) {
1159 virtio_queue_set_notification(vq, 0);
1160 qemu_bh_schedule(q->tx_bh);
1163 static void virtio_net_tx_timer(void *opaque)
1165 VirtIONetQueue *q = opaque;
1166 VirtIONet *n = q->n;
1167 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1168 assert(vdev->vm_running);
1172 /* Just in case the driver is not ready on more */
1173 if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
1177 virtio_queue_set_notification(q->tx_vq, 1);
1178 virtio_net_flush_tx(q);
1181 static void virtio_net_tx_bh(void *opaque)
1183 VirtIONetQueue *q = opaque;
1184 VirtIONet *n = q->n;
1185 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1188 assert(vdev->vm_running);
1192 /* Just in case the driver is not ready on more */
1193 if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
1197 ret = virtio_net_flush_tx(q);
1198 if (ret == -EBUSY) {
1199 return; /* Notification re-enable handled by tx_complete */
1202 /* If we flush a full burst of packets, assume there are
1203 * more coming and immediately reschedule */
1204 if (ret >= n->tx_burst) {
1205 qemu_bh_schedule(q->tx_bh);
1210 /* If less than a full burst, re-enable notification and flush
1211 * anything that may have come in while we weren't looking. If
1212 * we find something, assume the guest is still active and reschedule */
1213 virtio_queue_set_notification(q->tx_vq, 1);
1214 if (virtio_net_flush_tx(q) > 0) {
1215 virtio_queue_set_notification(q->tx_vq, 0);
1216 qemu_bh_schedule(q->tx_bh);
1221 static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
1223 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1224 int i, max = multiqueue ? n->max_queues : 1;
1226 n->multiqueue = multiqueue;
1228 for (i = 2; i <= n->max_queues * 2 + 1; i++) {
1229 virtio_del_queue(vdev, i);
1232 for (i = 1; i < max; i++) {
1233 n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1234 if (n->vqs[i].tx_timer) {
1236 virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
1237 n->vqs[i].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1238 virtio_net_tx_timer,
1242 virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
1243 n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]);
1246 n->vqs[i].tx_waiting = 0;
1250 /* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack
1251 * VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid
1254 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1256 virtio_net_set_queues(n);
1259 static void virtio_net_save(QEMUFile *f, void *opaque)
1262 VirtIONet *n = opaque;
1263 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1265 /* At this point, backend must be stopped, otherwise
1266 * it might keep writing to memory. */
1267 assert(!n->vhost_started);
1268 virtio_save(vdev, f);
1270 qemu_put_buffer(f, n->mac, ETH_ALEN);
1271 qemu_put_be32(f, n->vqs[0].tx_waiting);
1272 qemu_put_be32(f, n->mergeable_rx_bufs);
1273 qemu_put_be16(f, n->status);
1274 qemu_put_byte(f, n->promisc);
1275 qemu_put_byte(f, n->allmulti);
1276 qemu_put_be32(f, n->mac_table.in_use);
1277 qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
1278 qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1279 qemu_put_be32(f, n->has_vnet_hdr);
1280 qemu_put_byte(f, n->mac_table.multi_overflow);
1281 qemu_put_byte(f, n->mac_table.uni_overflow);
1282 qemu_put_byte(f, n->alluni);
1283 qemu_put_byte(f, n->nomulti);
1284 qemu_put_byte(f, n->nouni);
1285 qemu_put_byte(f, n->nobcast);
1286 qemu_put_byte(f, n->has_ufo);
1287 if (n->max_queues > 1) {
1288 qemu_put_be16(f, n->max_queues);
1289 qemu_put_be16(f, n->curr_queues);
1290 for (i = 1; i < n->curr_queues; i++) {
1291 qemu_put_be32(f, n->vqs[i].tx_waiting);
1295 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) {
1296 qemu_put_be64(f, n->curr_guest_offloads);
1300 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
1302 VirtIONet *n = opaque;
1303 VirtIODevice *vdev = VIRTIO_DEVICE(n);
1304 int ret, i, link_down;
1306 if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
1309 ret = virtio_load(vdev, f);
1314 qemu_get_buffer(f, n->mac, ETH_ALEN);
1315 n->vqs[0].tx_waiting = qemu_get_be32(f);
1317 virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));
1319 if (version_id >= 3)
1320 n->status = qemu_get_be16(f);
1322 if (version_id >= 4) {
1323 if (version_id < 8) {
1324 n->promisc = qemu_get_be32(f);
1325 n->allmulti = qemu_get_be32(f);
1327 n->promisc = qemu_get_byte(f);
1328 n->allmulti = qemu_get_byte(f);
1332 if (version_id >= 5) {
1333 n->mac_table.in_use = qemu_get_be32(f);
1334 /* MAC_TABLE_ENTRIES may be different from the saved image */
1335 if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
1336 qemu_get_buffer(f, n->mac_table.macs,
1337 n->mac_table.in_use * ETH_ALEN);
1338 } else if (n->mac_table.in_use) {
1339 uint8_t *buf = g_malloc0(n->mac_table.in_use);
1340 qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN);
1342 n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
1343 n->mac_table.in_use = 0;
1347 if (version_id >= 6)
1348 qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
1350 if (version_id >= 7) {
1351 if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
1352 error_report("virtio-net: saved image requires vnet_hdr=on");
1357 if (version_id >= 9) {
1358 n->mac_table.multi_overflow = qemu_get_byte(f);
1359 n->mac_table.uni_overflow = qemu_get_byte(f);
1362 if (version_id >= 10) {
1363 n->alluni = qemu_get_byte(f);
1364 n->nomulti = qemu_get_byte(f);
1365 n->nouni = qemu_get_byte(f);
1366 n->nobcast = qemu_get_byte(f);
1369 if (version_id >= 11) {
1370 if (qemu_get_byte(f) && !peer_has_ufo(n)) {
1371 error_report("virtio-net: saved image requires TUN_F_UFO support");
1376 if (n->max_queues > 1) {
1377 if (n->max_queues != qemu_get_be16(f)) {
1378 error_report("virtio-net: different max_queues ");
1382 n->curr_queues = qemu_get_be16(f);
1383 for (i = 1; i < n->curr_queues; i++) {
1384 n->vqs[i].tx_waiting = qemu_get_be32(f);
1388 if ((1 << VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) & vdev->guest_features) {
1389 n->curr_guest_offloads = qemu_get_be64(f);
1391 n->curr_guest_offloads = virtio_net_supported_guest_offloads(n);
1394 if (peer_has_vnet_hdr(n)) {
1395 virtio_net_apply_guest_offloads(n);
1398 virtio_net_set_queues(n);
1400 /* Find the first multicast entry in the saved MAC filter */
1401 for (i = 0; i < n->mac_table.in_use; i++) {
1402 if (n->mac_table.macs[i * ETH_ALEN] & 1) {
1406 n->mac_table.first_multi = i;
1408 /* nc.link_down can't be migrated, so infer link_down according
1409 * to link status bit in n->status */
1410 link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
1411 for (i = 0; i < n->max_queues; i++) {
1412 qemu_get_subqueue(n->nic, i)->link_down = link_down;
1418 static void virtio_net_cleanup(NetClientState *nc)
1420 VirtIONet *n = qemu_get_nic_opaque(nc);
1425 static NetClientInfo net_virtio_info = {
1426 .type = NET_CLIENT_OPTIONS_KIND_NIC,
1427 .size = sizeof(NICState),
1428 .can_receive = virtio_net_can_receive,
1429 .receive = virtio_net_receive,
1430 .cleanup = virtio_net_cleanup,
1431 .link_status_changed = virtio_net_set_link_status,
1432 .query_rx_filter = virtio_net_query_rxfilter,
1435 static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
1437 VirtIONet *n = VIRTIO_NET(vdev);
1438 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1439 assert(n->vhost_started);
1440 return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx);
1443 static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
1446 VirtIONet *n = VIRTIO_NET(vdev);
1447 NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
1448 assert(n->vhost_started);
1449 vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer),
1453 void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features)
1455 int i, config_size = 0;
1456 host_features |= (1 << VIRTIO_NET_F_MAC);
1457 for (i = 0; feature_sizes[i].flags != 0; i++) {
1458 if (host_features & feature_sizes[i].flags) {
1459 config_size = MAX(feature_sizes[i].end, config_size);
1462 n->config_size = config_size;
1465 void virtio_net_set_netclient_name(VirtIONet *n, const char *name,
1469 * The name can be NULL, the netclient name will be type.x.
1471 assert(type != NULL);
1473 if (n->netclient_name) {
1474 g_free(n->netclient_name);
1475 n->netclient_name = NULL;
1477 if (n->netclient_type) {
1478 g_free(n->netclient_type);
1479 n->netclient_type = NULL;
1483 n->netclient_name = g_strdup(name);
1485 n->netclient_type = g_strdup(type);
1488 static int virtio_net_device_init(VirtIODevice *vdev)
1492 DeviceState *qdev = DEVICE(vdev);
1493 VirtIONet *n = VIRTIO_NET(vdev);
1496 virtio_init(VIRTIO_DEVICE(n), "virtio-net", VIRTIO_ID_NET,
1499 n->max_queues = MAX(n->nic_conf.queues, 1);
1500 n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
1501 n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
1504 n->tx_timeout = n->net_conf.txtimer;
1506 if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
1507 && strcmp(n->net_conf.tx, "bh")) {
1508 error_report("virtio-net: "
1509 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1511 error_report("Defaulting to \"bh\"");
1514 if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
1515 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
1516 virtio_net_handle_tx_timer);
1517 n->vqs[0].tx_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, virtio_net_tx_timer,
1520 n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
1521 virtio_net_handle_tx_bh);
1522 n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]);
1524 n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
1525 qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
1526 memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
1527 n->status = VIRTIO_NET_S_LINK_UP;
1529 if (n->netclient_type) {
1531 * Happen when virtio_net_set_netclient_name has been called.
1533 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1534 n->netclient_type, n->netclient_name, n);
1536 n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
1537 object_get_typename(OBJECT(qdev)), qdev->id, n);
1540 peer_test_vnet_hdr(n);
1541 if (peer_has_vnet_hdr(n)) {
1542 for (i = 0; i < n->max_queues; i++) {
1543 tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
1545 n->host_hdr_len = sizeof(struct virtio_net_hdr);
1547 n->host_hdr_len = 0;
1550 qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
1552 n->vqs[0].tx_waiting = 0;
1553 n->tx_burst = n->net_conf.txburst;
1554 virtio_net_set_mrg_rx_bufs(n, 0);
1555 n->promisc = 1; /* for compatibility */
1557 n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
1559 n->vlans = g_malloc0(MAX_VLAN >> 3);
1561 nc = qemu_get_queue(n->nic);
1562 nc->rxfilter_notify_enabled = 1;
1565 register_savevm(qdev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
1566 virtio_net_save, virtio_net_load, n);
1568 add_boot_device_path(n->nic_conf.bootindex, qdev, "/ethernet-phy@0");
1572 static int virtio_net_device_exit(DeviceState *qdev)
1574 VirtIONet *n = VIRTIO_NET(qdev);
1575 VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
1578 /* This will stop vhost backend if appropriate. */
1579 virtio_net_set_status(vdev, 0);
1581 unregister_savevm(qdev, "virtio-net", n);
1583 if (n->netclient_name) {
1584 g_free(n->netclient_name);
1585 n->netclient_name = NULL;
1587 if (n->netclient_type) {
1588 g_free(n->netclient_type);
1589 n->netclient_type = NULL;
1592 g_free(n->mac_table.macs);
1595 for (i = 0; i < n->max_queues; i++) {
1596 VirtIONetQueue *q = &n->vqs[i];
1597 NetClientState *nc = qemu_get_subqueue(n->nic, i);
1599 qemu_purge_queued_packets(nc);
1602 timer_del(q->tx_timer);
1603 timer_free(q->tx_timer);
1605 qemu_bh_delete(q->tx_bh);
1610 qemu_del_nic(n->nic);
1611 virtio_cleanup(vdev);
1616 static void virtio_net_instance_init(Object *obj)
1618 VirtIONet *n = VIRTIO_NET(obj);
1621 * The default config_size is sizeof(struct virtio_net_config).
1622 * Can be overriden with virtio_net_set_config_size.
1624 n->config_size = sizeof(struct virtio_net_config);
1627 static Property virtio_net_properties[] = {
1628 DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
1629 DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
1631 DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
1632 DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
1633 DEFINE_PROP_END_OF_LIST(),
1636 static void virtio_net_class_init(ObjectClass *klass, void *data)
1638 DeviceClass *dc = DEVICE_CLASS(klass);
1639 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
1640 dc->exit = virtio_net_device_exit;
1641 dc->props = virtio_net_properties;
1642 set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1643 vdc->init = virtio_net_device_init;
1644 vdc->get_config = virtio_net_get_config;
1645 vdc->set_config = virtio_net_set_config;
1646 vdc->get_features = virtio_net_get_features;
1647 vdc->set_features = virtio_net_set_features;
1648 vdc->bad_features = virtio_net_bad_features;
1649 vdc->reset = virtio_net_reset;
1650 vdc->set_status = virtio_net_set_status;
1651 vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
1652 vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
1655 static const TypeInfo virtio_net_info = {
1656 .name = TYPE_VIRTIO_NET,
1657 .parent = TYPE_VIRTIO_DEVICE,
1658 .instance_size = sizeof(VirtIONet),
1659 .instance_init = virtio_net_instance_init,
1660 .class_init = virtio_net_class_init,
1663 static void virtio_register_types(void)
1665 type_register_static(&virtio_net_info);
1668 type_init(virtio_register_types)