2
* Virtio Network Device
4
* Copyright IBM, Corp. 2007
7
* Anthony Liguori <aliguori@us.ibm.com>
9
* This work is licensed under the terms of the GNU GPL, version 2. See
10
* the COPYING file in the top-level directory.
17
#include "net/checksum.h"
19
#include "qemu-error.h"
20
#include "qemu-timer.h"
21
#include "virtio-net.h"
22
#include "vhost_net.h"
24
#define VIRTIO_NET_VM_VERSION 11
26
#define MAC_TABLE_ENTRIES 64
27
#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
29
typedef struct VirtIONet
32
uint8_t mac[ETH_ALEN];
43
uint32_t has_vnet_hdr;
46
VirtQueueElement elem;
49
int mergeable_rx_bufs;
56
uint8_t vhost_started;
60
uint8_t multi_overflow;
69
* - we could suppress RX interrupt if we were so inclined.
72
static VirtIONet *to_virtio_net(VirtIODevice *vdev)
74
return (VirtIONet *)vdev;
77
static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
79
VirtIONet *n = to_virtio_net(vdev);
80
struct virtio_net_config netcfg;
82
stw_p(&netcfg.status, n->status);
83
memcpy(netcfg.mac, n->mac, ETH_ALEN);
84
memcpy(config, &netcfg, sizeof(netcfg));
87
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
89
VirtIONet *n = to_virtio_net(vdev);
90
struct virtio_net_config netcfg;
92
memcpy(&netcfg, config, sizeof(netcfg));
94
if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
95
memcpy(n->mac, netcfg.mac, ETH_ALEN);
96
qemu_format_nic_info_str(&n->nic->nc, n->mac);
100
static bool virtio_net_started(VirtIONet *n, uint8_t status)
102
return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
103
(n->status & VIRTIO_NET_S_LINK_UP) && n->vdev.vm_running;
106
static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
108
if (!n->nic->nc.peer) {
111
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
115
if (!tap_get_vhost_net(n->nic->nc.peer)) {
118
if (!!n->vhost_started == virtio_net_started(n, status) &&
119
!n->nic->nc.peer->link_down) {
122
if (!n->vhost_started) {
124
if (!vhost_net_query(tap_get_vhost_net(n->nic->nc.peer), &n->vdev)) {
127
r = vhost_net_start(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
129
error_report("unable to start vhost net: %d: "
130
"falling back on userspace virtio", -r);
132
n->vhost_started = 1;
135
vhost_net_stop(tap_get_vhost_net(n->nic->nc.peer), &n->vdev);
136
n->vhost_started = 0;
140
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
142
VirtIONet *n = to_virtio_net(vdev);
144
virtio_net_vhost_status(n, status);
146
if (!n->tx_waiting) {
150
if (virtio_net_started(n, status) && !n->vhost_started) {
152
qemu_mod_timer(n->tx_timer,
153
qemu_get_clock_ns(vm_clock) + n->tx_timeout);
155
qemu_bh_schedule(n->tx_bh);
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qemu_del_timer(n->tx_timer);
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qemu_bh_cancel(n->tx_bh);
166
static void virtio_net_set_link_status(VLANClientState *nc)
168
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
169
uint16_t old_status = n->status;
172
n->status &= ~VIRTIO_NET_S_LINK_UP;
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n->status |= VIRTIO_NET_S_LINK_UP;
176
if (n->status != old_status)
177
virtio_notify_config(&n->vdev);
179
virtio_net_set_status(&n->vdev, n->vdev.status);
182
static void virtio_net_reset(VirtIODevice *vdev)
184
VirtIONet *n = to_virtio_net(vdev);
186
/* Reset back to compatibility mode */
194
/* Flush any MAC and VLAN filter table state */
195
n->mac_table.in_use = 0;
196
n->mac_table.first_multi = 0;
197
n->mac_table.multi_overflow = 0;
198
n->mac_table.uni_overflow = 0;
199
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
200
memset(n->vlans, 0, MAX_VLAN >> 3);
203
static int peer_has_vnet_hdr(VirtIONet *n)
205
if (!n->nic->nc.peer)
208
if (n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP)
211
n->has_vnet_hdr = tap_has_vnet_hdr(n->nic->nc.peer);
213
return n->has_vnet_hdr;
216
static int peer_has_ufo(VirtIONet *n)
218
if (!peer_has_vnet_hdr(n))
221
n->has_ufo = tap_has_ufo(n->nic->nc.peer);
226
static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
228
VirtIONet *n = to_virtio_net(vdev);
230
features |= (1 << VIRTIO_NET_F_MAC);
232
if (peer_has_vnet_hdr(n)) {
233
tap_using_vnet_hdr(n->nic->nc.peer, 1);
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features &= ~(0x1 << VIRTIO_NET_F_CSUM);
236
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
237
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
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features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
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features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
243
features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
246
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
247
features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
248
features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
251
if (!n->nic->nc.peer ||
252
n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
255
if (!tap_get_vhost_net(n->nic->nc.peer)) {
258
return vhost_net_get_features(tap_get_vhost_net(n->nic->nc.peer), features);
261
static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
263
uint32_t features = 0;
265
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
267
features |= (1 << VIRTIO_NET_F_MAC);
268
features |= (1 << VIRTIO_NET_F_CSUM);
269
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
270
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
271
features |= (1 << VIRTIO_NET_F_HOST_ECN);
276
static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
278
VirtIONet *n = to_virtio_net(vdev);
280
n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
282
if (n->has_vnet_hdr) {
283
tap_set_offload(n->nic->nc.peer,
284
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
285
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
286
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
287
(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
288
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
290
if (!n->nic->nc.peer ||
291
n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
294
if (!tap_get_vhost_net(n->nic->nc.peer)) {
297
vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
300
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
301
VirtQueueElement *elem)
305
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
306
error_report("virtio-net ctrl invalid rx mode command");
310
on = ldub_p(elem->out_sg[1].iov_base);
312
if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
314
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
316
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI)
318
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI)
320
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI)
322
else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST)
325
return VIRTIO_NET_ERR;
327
return VIRTIO_NET_OK;
330
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
331
VirtQueueElement *elem)
333
struct virtio_net_ctrl_mac mac_data;
335
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
336
elem->out_sg[1].iov_len < sizeof(mac_data) ||
337
elem->out_sg[2].iov_len < sizeof(mac_data))
338
return VIRTIO_NET_ERR;
340
n->mac_table.in_use = 0;
341
n->mac_table.first_multi = 0;
342
n->mac_table.uni_overflow = 0;
343
n->mac_table.multi_overflow = 0;
344
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
346
mac_data.entries = ldl_p(elem->out_sg[1].iov_base);
348
if (sizeof(mac_data.entries) +
349
(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
350
return VIRTIO_NET_ERR;
352
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
353
memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
354
mac_data.entries * ETH_ALEN);
355
n->mac_table.in_use += mac_data.entries;
357
n->mac_table.uni_overflow = 1;
360
n->mac_table.first_multi = n->mac_table.in_use;
362
mac_data.entries = ldl_p(elem->out_sg[2].iov_base);
364
if (sizeof(mac_data.entries) +
365
(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
366
return VIRTIO_NET_ERR;
368
if (mac_data.entries) {
369
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
370
memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
371
elem->out_sg[2].iov_base + sizeof(mac_data),
372
mac_data.entries * ETH_ALEN);
373
n->mac_table.in_use += mac_data.entries;
375
n->mac_table.multi_overflow = 1;
379
return VIRTIO_NET_OK;
382
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
383
VirtQueueElement *elem)
387
if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
388
error_report("virtio-net ctrl invalid vlan command");
389
return VIRTIO_NET_ERR;
392
vid = lduw_p(elem->out_sg[1].iov_base);
395
return VIRTIO_NET_ERR;
397
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
398
n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
399
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
400
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
402
return VIRTIO_NET_ERR;
404
return VIRTIO_NET_OK;
407
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
409
VirtIONet *n = to_virtio_net(vdev);
410
struct virtio_net_ctrl_hdr ctrl;
411
virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
412
VirtQueueElement elem;
414
while (virtqueue_pop(vq, &elem)) {
415
if ((elem.in_num < 1) || (elem.out_num < 1)) {
416
error_report("virtio-net ctrl missing headers");
420
if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
421
elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
422
error_report("virtio-net ctrl header not in correct element");
426
ctrl.class = ldub_p(elem.out_sg[0].iov_base);
427
ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
429
if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
430
status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
431
else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
432
status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
433
else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
434
status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
436
stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
438
virtqueue_push(vq, &elem, sizeof(status));
439
virtio_notify(vdev, vq);
445
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
447
VirtIONet *n = to_virtio_net(vdev);
449
qemu_flush_queued_packets(&n->nic->nc);
451
/* We now have RX buffers, signal to the IO thread to break out of the
452
* select to re-poll the tap file descriptor */
456
static int virtio_net_can_receive(VLANClientState *nc)
458
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
459
if (!n->vdev.vm_running) {
463
if (!virtio_queue_ready(n->rx_vq) ||
464
!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
470
static int virtio_net_has_buffers(VirtIONet *n, int bufsize)
472
if (virtio_queue_empty(n->rx_vq) ||
473
(n->mergeable_rx_bufs &&
474
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
475
virtio_queue_set_notification(n->rx_vq, 1);
477
/* To avoid a race condition where the guest has made some buffers
478
* available after the above check but before notification was
479
* enabled, check for available buffers again.
481
if (virtio_queue_empty(n->rx_vq) ||
482
(n->mergeable_rx_bufs &&
483
!virtqueue_avail_bytes(n->rx_vq, bufsize, 0)))
487
virtio_queue_set_notification(n->rx_vq, 0);
491
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
492
* it never finds out that the packets don't have valid checksums. This
493
* causes dhclient to get upset. Fedora's carried a patch for ages to
494
* fix this with Xen but it hasn't appeared in an upstream release of
497
* To avoid breaking existing guests, we catch udp packets and add
498
* checksums. This is terrible but it's better than hacking the guest
501
* N.B. if we introduce a zero-copy API, this operation is no longer free so
502
* we should provide a mechanism to disable it to avoid polluting the host
505
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
506
const uint8_t *buf, size_t size)
508
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
509
(size > 27 && size < 1500) && /* normal sized MTU */
510
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
511
(buf[23] == 17) && /* ip.protocol == UDP */
512
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
513
/* FIXME this cast is evil */
514
net_checksum_calculate((uint8_t *)buf, size);
515
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
519
static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
520
const void *buf, size_t size, size_t hdr_len)
522
struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base;
526
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
528
if (n->has_vnet_hdr) {
529
memcpy(hdr, buf, sizeof(*hdr));
530
offset = sizeof(*hdr);
531
work_around_broken_dhclient(hdr, buf + offset, size - offset);
534
/* We only ever receive a struct virtio_net_hdr from the tapfd,
535
* but we may be passing along a larger header to the guest.
537
iov[0].iov_base += hdr_len;
538
iov[0].iov_len -= hdr_len;
543
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
545
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
546
static const uint8_t vlan[] = {0x81, 0x00};
547
uint8_t *ptr = (uint8_t *)buf;
553
if (n->has_vnet_hdr) {
554
ptr += sizeof(struct virtio_net_hdr);
557
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
558
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
559
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
563
if (ptr[0] & 1) { // multicast
564
if (!memcmp(ptr, bcast, sizeof(bcast))) {
566
} else if (n->nomulti) {
568
} else if (n->allmulti || n->mac_table.multi_overflow) {
572
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
573
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
580
} else if (n->alluni || n->mac_table.uni_overflow) {
582
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
586
for (i = 0; i < n->mac_table.first_multi; i++) {
587
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
596
static ssize_t virtio_net_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
598
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
599
struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
600
size_t guest_hdr_len, offset, i, host_hdr_len;
602
if (!virtio_net_can_receive(&n->nic->nc))
605
/* hdr_len refers to the header we supply to the guest */
606
guest_hdr_len = n->mergeable_rx_bufs ?
607
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
610
host_hdr_len = n->has_vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
611
if (!virtio_net_has_buffers(n, size + guest_hdr_len - host_hdr_len))
614
if (!receive_filter(n, buf, size))
619
while (offset < size) {
620
VirtQueueElement elem;
622
struct iovec sg[VIRTQUEUE_MAX_SIZE];
626
if (virtqueue_pop(n->rx_vq, &elem) == 0) {
629
error_report("virtio-net unexpected empty queue: "
630
"i %zd mergeable %d offset %zd, size %zd, "
631
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
632
i, n->mergeable_rx_bufs, offset, size,
633
guest_hdr_len, host_hdr_len, n->vdev.guest_features);
637
if (elem.in_num < 1) {
638
error_report("virtio-net receive queue contains no in buffers");
642
if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != guest_hdr_len) {
643
error_report("virtio-net header not in first element");
647
memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
650
if (n->mergeable_rx_bufs)
651
mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
653
offset += receive_header(n, sg, elem.in_num,
654
buf + offset, size - offset, guest_hdr_len);
655
total += guest_hdr_len;
658
/* copy in packet. ugh */
659
len = iov_from_buf(sg, elem.in_num,
660
buf + offset, 0, size - offset);
663
/* If buffers can't be merged, at this point we
664
* must have consumed the complete packet.
665
* Otherwise, drop it. */
666
if (!n->mergeable_rx_bufs && offset < size) {
668
error_report("virtio-net truncated non-mergeable packet: "
669
"i %zd mergeable %d offset %zd, size %zd, "
670
"guest hdr len %zd, host hdr len %zd",
671
i, n->mergeable_rx_bufs,
672
offset, size, guest_hdr_len, host_hdr_len);
677
/* signal other side */
678
virtqueue_fill(n->rx_vq, &elem, total, i++);
682
stw_p(&mhdr->num_buffers, i);
685
virtqueue_flush(n->rx_vq, i);
686
virtio_notify(&n->vdev, n->rx_vq);
691
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
693
static void virtio_net_tx_complete(VLANClientState *nc, ssize_t len)
695
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
697
virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len);
698
virtio_notify(&n->vdev, n->tx_vq);
700
n->async_tx.elem.out_num = n->async_tx.len = 0;
702
virtio_queue_set_notification(n->tx_vq, 1);
703
virtio_net_flush_tx(n, n->tx_vq);
707
static int32_t virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
709
VirtQueueElement elem;
710
int32_t num_packets = 0;
711
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
715
assert(n->vdev.vm_running);
717
if (n->async_tx.elem.out_num) {
718
virtio_queue_set_notification(n->tx_vq, 0);
722
while (virtqueue_pop(vq, &elem)) {
723
ssize_t ret, len = 0;
724
unsigned int out_num = elem.out_num;
725
struct iovec *out_sg = &elem.out_sg[0];
728
/* hdr_len refers to the header received from the guest */
729
hdr_len = n->mergeable_rx_bufs ?
730
sizeof(struct virtio_net_hdr_mrg_rxbuf) :
731
sizeof(struct virtio_net_hdr);
733
if (out_num < 1 || out_sg->iov_len != hdr_len) {
734
error_report("virtio-net header not in first element");
738
/* ignore the header if GSO is not supported */
739
if (!n->has_vnet_hdr) {
743
} else if (n->mergeable_rx_bufs) {
744
/* tapfd expects a struct virtio_net_hdr */
745
hdr_len -= sizeof(struct virtio_net_hdr);
746
out_sg->iov_len -= hdr_len;
750
ret = qemu_sendv_packet_async(&n->nic->nc, out_sg, out_num,
751
virtio_net_tx_complete);
753
virtio_queue_set_notification(n->tx_vq, 0);
754
n->async_tx.elem = elem;
755
n->async_tx.len = len;
761
virtqueue_push(vq, &elem, len);
762
virtio_notify(&n->vdev, vq);
764
if (++num_packets >= n->tx_burst) {
771
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
773
VirtIONet *n = to_virtio_net(vdev);
775
/* This happens when device was stopped but VCPU wasn't. */
776
if (!n->vdev.vm_running) {
782
virtio_queue_set_notification(vq, 1);
783
qemu_del_timer(n->tx_timer);
785
virtio_net_flush_tx(n, vq);
787
qemu_mod_timer(n->tx_timer,
788
qemu_get_clock_ns(vm_clock) + n->tx_timeout);
790
virtio_queue_set_notification(vq, 0);
794
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
796
VirtIONet *n = to_virtio_net(vdev);
798
if (unlikely(n->tx_waiting)) {
802
/* This happens when device was stopped but VCPU wasn't. */
803
if (!n->vdev.vm_running) {
806
virtio_queue_set_notification(vq, 0);
807
qemu_bh_schedule(n->tx_bh);
810
static void virtio_net_tx_timer(void *opaque)
812
VirtIONet *n = opaque;
813
assert(n->vdev.vm_running);
817
/* Just in case the driver is not ready on more */
818
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
821
virtio_queue_set_notification(n->tx_vq, 1);
822
virtio_net_flush_tx(n, n->tx_vq);
825
static void virtio_net_tx_bh(void *opaque)
827
VirtIONet *n = opaque;
830
assert(n->vdev.vm_running);
834
/* Just in case the driver is not ready on more */
835
if (unlikely(!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)))
838
ret = virtio_net_flush_tx(n, n->tx_vq);
840
return; /* Notification re-enable handled by tx_complete */
843
/* If we flush a full burst of packets, assume there are
844
* more coming and immediately reschedule */
845
if (ret >= n->tx_burst) {
846
qemu_bh_schedule(n->tx_bh);
851
/* If less than a full burst, re-enable notification and flush
852
* anything that may have come in while we weren't looking. If
853
* we find something, assume the guest is still active and reschedule */
854
virtio_queue_set_notification(n->tx_vq, 1);
855
if (virtio_net_flush_tx(n, n->tx_vq) > 0) {
856
virtio_queue_set_notification(n->tx_vq, 0);
857
qemu_bh_schedule(n->tx_bh);
862
static void virtio_net_save(QEMUFile *f, void *opaque)
864
VirtIONet *n = opaque;
866
/* At this point, backend must be stopped, otherwise
867
* it might keep writing to memory. */
868
assert(!n->vhost_started);
869
virtio_save(&n->vdev, f);
871
qemu_put_buffer(f, n->mac, ETH_ALEN);
872
qemu_put_be32(f, n->tx_waiting);
873
qemu_put_be32(f, n->mergeable_rx_bufs);
874
qemu_put_be16(f, n->status);
875
qemu_put_byte(f, n->promisc);
876
qemu_put_byte(f, n->allmulti);
877
qemu_put_be32(f, n->mac_table.in_use);
878
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
879
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
880
qemu_put_be32(f, n->has_vnet_hdr);
881
qemu_put_byte(f, n->mac_table.multi_overflow);
882
qemu_put_byte(f, n->mac_table.uni_overflow);
883
qemu_put_byte(f, n->alluni);
884
qemu_put_byte(f, n->nomulti);
885
qemu_put_byte(f, n->nouni);
886
qemu_put_byte(f, n->nobcast);
887
qemu_put_byte(f, n->has_ufo);
890
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
892
VirtIONet *n = opaque;
895
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
898
virtio_load(&n->vdev, f);
900
qemu_get_buffer(f, n->mac, ETH_ALEN);
901
n->tx_waiting = qemu_get_be32(f);
902
n->mergeable_rx_bufs = qemu_get_be32(f);
905
n->status = qemu_get_be16(f);
907
if (version_id >= 4) {
908
if (version_id < 8) {
909
n->promisc = qemu_get_be32(f);
910
n->allmulti = qemu_get_be32(f);
912
n->promisc = qemu_get_byte(f);
913
n->allmulti = qemu_get_byte(f);
917
if (version_id >= 5) {
918
n->mac_table.in_use = qemu_get_be32(f);
919
/* MAC_TABLE_ENTRIES may be different from the saved image */
920
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
921
qemu_get_buffer(f, n->mac_table.macs,
922
n->mac_table.in_use * ETH_ALEN);
923
} else if (n->mac_table.in_use) {
924
qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
925
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
926
n->mac_table.in_use = 0;
931
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
933
if (version_id >= 7) {
934
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
935
error_report("virtio-net: saved image requires vnet_hdr=on");
939
if (n->has_vnet_hdr) {
940
tap_using_vnet_hdr(n->nic->nc.peer, 1);
941
tap_set_offload(n->nic->nc.peer,
942
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
943
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
944
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
945
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
946
(n->vdev.guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
950
if (version_id >= 9) {
951
n->mac_table.multi_overflow = qemu_get_byte(f);
952
n->mac_table.uni_overflow = qemu_get_byte(f);
955
if (version_id >= 10) {
956
n->alluni = qemu_get_byte(f);
957
n->nomulti = qemu_get_byte(f);
958
n->nouni = qemu_get_byte(f);
959
n->nobcast = qemu_get_byte(f);
962
if (version_id >= 11) {
963
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
964
error_report("virtio-net: saved image requires TUN_F_UFO support");
969
/* Find the first multicast entry in the saved MAC filter */
970
for (i = 0; i < n->mac_table.in_use; i++) {
971
if (n->mac_table.macs[i * ETH_ALEN] & 1) {
975
n->mac_table.first_multi = i;
979
static void virtio_net_cleanup(VLANClientState *nc)
981
VirtIONet *n = DO_UPCAST(NICState, nc, nc)->opaque;
986
static NetClientInfo net_virtio_info = {
987
.type = NET_CLIENT_TYPE_NIC,
988
.size = sizeof(NICState),
989
.can_receive = virtio_net_can_receive,
990
.receive = virtio_net_receive,
991
.cleanup = virtio_net_cleanup,
992
.link_status_changed = virtio_net_set_link_status,
995
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
996
virtio_net_conf *net)
1000
n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
1001
sizeof(struct virtio_net_config),
1004
n->vdev.get_config = virtio_net_get_config;
1005
n->vdev.set_config = virtio_net_set_config;
1006
n->vdev.get_features = virtio_net_get_features;
1007
n->vdev.set_features = virtio_net_set_features;
1008
n->vdev.bad_features = virtio_net_bad_features;
1009
n->vdev.reset = virtio_net_reset;
1010
n->vdev.set_status = virtio_net_set_status;
1011
n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
1013
if (net->tx && strcmp(net->tx, "timer") && strcmp(net->tx, "bh")) {
1014
error_report("virtio-net: "
1015
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1017
error_report("Defaulting to \"bh\"");
1020
if (net->tx && !strcmp(net->tx, "timer")) {
1021
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_timer);
1022
n->tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer, n);
1023
n->tx_timeout = net->txtimer;
1025
n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx_bh);
1026
n->tx_bh = qemu_bh_new(virtio_net_tx_bh, n);
1028
n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
1029
qemu_macaddr_default_if_unset(&conf->macaddr);
1030
memcpy(&n->mac[0], &conf->macaddr, sizeof(n->mac));
1031
n->status = VIRTIO_NET_S_LINK_UP;
1033
n->nic = qemu_new_nic(&net_virtio_info, conf, dev->info->name, dev->id, n);
1035
qemu_format_nic_info_str(&n->nic->nc, conf->macaddr.a);
1038
n->tx_burst = net->txburst;
1039
n->mergeable_rx_bufs = 0;
1040
n->promisc = 1; /* for compatibility */
1042
n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
1044
n->vlans = qemu_mallocz(MAX_VLAN >> 3);
1047
register_savevm(dev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
1048
virtio_net_save, virtio_net_load, n);
1050
add_boot_device_path(conf->bootindex, dev, "/ethernet-phy@0");
1055
void virtio_net_exit(VirtIODevice *vdev)
1057
VirtIONet *n = DO_UPCAST(VirtIONet, vdev, vdev);
1059
/* This will stop vhost backend if appropriate. */
1060
virtio_net_set_status(vdev, 0);
1062
qemu_purge_queued_packets(&n->nic->nc);
1064
unregister_savevm(n->qdev, "virtio-net", n);
1066
qemu_free(n->mac_table.macs);
1067
qemu_free(n->vlans);
1070
qemu_del_timer(n->tx_timer);
1071
qemu_free_timer(n->tx_timer);
1073
qemu_bh_delete(n->tx_bh);
1076
virtio_cleanup(&n->vdev);
1077
qemu_del_vlan_client(&n->nic->nc);