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.
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 /* Any packets outstanding? Purge them to avoid touching rings
132 * when vhost is running.
134 for (i
= 0; i
< queues
; i
++) {
135 NetClientState
*qnc
= qemu_get_subqueue(n
->nic
, i
);
137 /* Purge both directions: TX and RX. */
138 qemu_net_queue_purge(qnc
->peer
->incoming_queue
, qnc
);
139 qemu_net_queue_purge(qnc
->incoming_queue
, qnc
->peer
);
142 n
->vhost_started
= 1;
143 r
= vhost_net_start(vdev
, n
->nic
->ncs
, queues
);
145 error_report("unable to start vhost net: %d: "
146 "falling back on userspace virtio", -r
);
147 n
->vhost_started
= 0;
150 vhost_net_stop(vdev
, n
->nic
->ncs
, queues
);
151 n
->vhost_started
= 0;
155 static void virtio_net_set_status(struct VirtIODevice
*vdev
, uint8_t status
)
157 VirtIONet
*n
= VIRTIO_NET(vdev
);
160 uint8_t queue_status
;
162 virtio_net_vhost_status(n
, status
);
164 for (i
= 0; i
< n
->max_queues
; i
++) {
165 NetClientState
*ncs
= qemu_get_subqueue(n
->nic
, i
);
169 if ((!n
->multiqueue
&& i
!= 0) || i
>= n
->curr_queues
) {
172 queue_status
= status
;
175 virtio_net_started(n
, queue_status
) && !n
->vhost_started
;
178 qemu_flush_queued_packets(ncs
);
181 if (!q
->tx_waiting
) {
187 timer_mod(q
->tx_timer
,
188 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
) + n
->tx_timeout
);
190 qemu_bh_schedule(q
->tx_bh
);
194 timer_del(q
->tx_timer
);
196 qemu_bh_cancel(q
->tx_bh
);
202 static void virtio_net_set_link_status(NetClientState
*nc
)
204 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
205 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
206 uint16_t old_status
= n
->status
;
209 n
->status
&= ~VIRTIO_NET_S_LINK_UP
;
211 n
->status
|= VIRTIO_NET_S_LINK_UP
;
213 if (n
->status
!= old_status
)
214 virtio_notify_config(vdev
);
216 virtio_net_set_status(vdev
, vdev
->status
);
219 static void rxfilter_notify(NetClientState
*nc
)
221 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
223 if (nc
->rxfilter_notify_enabled
) {
224 gchar
*path
= object_get_canonical_path(OBJECT(n
->qdev
));
225 qapi_event_send_nic_rx_filter_changed(!!n
->netclient_name
,
226 n
->netclient_name
, path
, &error_abort
);
229 /* disable event notification to avoid events flooding */
230 nc
->rxfilter_notify_enabled
= 0;
234 static intList
*get_vlan_table(VirtIONet
*n
)
236 intList
*list
, *entry
;
240 for (i
= 0; i
< MAX_VLAN
>> 5; i
++) {
241 for (j
= 0; n
->vlans
[i
] && j
<= 0x1f; j
++) {
242 if (n
->vlans
[i
] & (1U << j
)) {
243 entry
= g_malloc0(sizeof(*entry
));
244 entry
->value
= (i
<< 5) + j
;
254 static RxFilterInfo
*virtio_net_query_rxfilter(NetClientState
*nc
)
256 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
257 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
259 strList
*str_list
, *entry
;
262 info
= g_malloc0(sizeof(*info
));
263 info
->name
= g_strdup(nc
->name
);
264 info
->promiscuous
= n
->promisc
;
267 info
->unicast
= RX_STATE_NONE
;
268 } else if (n
->alluni
) {
269 info
->unicast
= RX_STATE_ALL
;
271 info
->unicast
= RX_STATE_NORMAL
;
275 info
->multicast
= RX_STATE_NONE
;
276 } else if (n
->allmulti
) {
277 info
->multicast
= RX_STATE_ALL
;
279 info
->multicast
= RX_STATE_NORMAL
;
282 info
->broadcast_allowed
= n
->nobcast
;
283 info
->multicast_overflow
= n
->mac_table
.multi_overflow
;
284 info
->unicast_overflow
= n
->mac_table
.uni_overflow
;
286 info
->main_mac
= qemu_mac_strdup_printf(n
->mac
);
289 for (i
= 0; i
< n
->mac_table
.first_multi
; i
++) {
290 entry
= g_malloc0(sizeof(*entry
));
291 entry
->value
= qemu_mac_strdup_printf(n
->mac_table
.macs
+ i
* ETH_ALEN
);
292 entry
->next
= str_list
;
295 info
->unicast_table
= str_list
;
298 for (i
= n
->mac_table
.first_multi
; i
< n
->mac_table
.in_use
; i
++) {
299 entry
= g_malloc0(sizeof(*entry
));
300 entry
->value
= qemu_mac_strdup_printf(n
->mac_table
.macs
+ i
* ETH_ALEN
);
301 entry
->next
= str_list
;
304 info
->multicast_table
= str_list
;
305 info
->vlan_table
= get_vlan_table(n
);
307 if (!virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_VLAN
)) {
308 info
->vlan
= RX_STATE_ALL
;
309 } else if (!info
->vlan_table
) {
310 info
->vlan
= RX_STATE_NONE
;
312 info
->vlan
= RX_STATE_NORMAL
;
315 /* enable event notification after query */
316 nc
->rxfilter_notify_enabled
= 1;
321 static void virtio_net_reset(VirtIODevice
*vdev
)
323 VirtIONet
*n
= VIRTIO_NET(vdev
);
325 /* Reset back to compatibility mode */
332 /* multiqueue is disabled by default */
334 timer_del(n
->announce_timer
);
335 n
->announce_counter
= 0;
336 n
->status
&= ~VIRTIO_NET_S_ANNOUNCE
;
338 /* Flush any MAC and VLAN filter table state */
339 n
->mac_table
.in_use
= 0;
340 n
->mac_table
.first_multi
= 0;
341 n
->mac_table
.multi_overflow
= 0;
342 n
->mac_table
.uni_overflow
= 0;
343 memset(n
->mac_table
.macs
, 0, MAC_TABLE_ENTRIES
* ETH_ALEN
);
344 memcpy(&n
->mac
[0], &n
->nic
->conf
->macaddr
, sizeof(n
->mac
));
345 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->mac
);
346 memset(n
->vlans
, 0, MAX_VLAN
>> 3);
349 static void peer_test_vnet_hdr(VirtIONet
*n
)
351 NetClientState
*nc
= qemu_get_queue(n
->nic
);
356 n
->has_vnet_hdr
= qemu_has_vnet_hdr(nc
->peer
);
359 static int peer_has_vnet_hdr(VirtIONet
*n
)
361 return n
->has_vnet_hdr
;
364 static int peer_has_ufo(VirtIONet
*n
)
366 if (!peer_has_vnet_hdr(n
))
369 n
->has_ufo
= qemu_has_ufo(qemu_get_queue(n
->nic
)->peer
);
374 static void virtio_net_set_mrg_rx_bufs(VirtIONet
*n
, int mergeable_rx_bufs
,
380 n
->mergeable_rx_bufs
= mergeable_rx_bufs
;
383 n
->guest_hdr_len
= sizeof(struct virtio_net_hdr_mrg_rxbuf
);
385 n
->guest_hdr_len
= n
->mergeable_rx_bufs
?
386 sizeof(struct virtio_net_hdr_mrg_rxbuf
) :
387 sizeof(struct virtio_net_hdr
);
390 for (i
= 0; i
< n
->max_queues
; i
++) {
391 nc
= qemu_get_subqueue(n
->nic
, i
);
393 if (peer_has_vnet_hdr(n
) &&
394 qemu_has_vnet_hdr_len(nc
->peer
, n
->guest_hdr_len
)) {
395 qemu_set_vnet_hdr_len(nc
->peer
, n
->guest_hdr_len
);
396 n
->host_hdr_len
= n
->guest_hdr_len
;
401 static int peer_attach(VirtIONet
*n
, int index
)
403 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, index
);
409 if (nc
->peer
->info
->type
!= NET_CLIENT_OPTIONS_KIND_TAP
) {
413 return tap_enable(nc
->peer
);
416 static int peer_detach(VirtIONet
*n
, int index
)
418 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, index
);
424 if (nc
->peer
->info
->type
!= NET_CLIENT_OPTIONS_KIND_TAP
) {
428 return tap_disable(nc
->peer
);
431 static void virtio_net_set_queues(VirtIONet
*n
)
436 for (i
= 0; i
< n
->max_queues
; i
++) {
437 if (i
< n
->curr_queues
) {
438 r
= peer_attach(n
, i
);
441 r
= peer_detach(n
, i
);
447 static void virtio_net_set_multiqueue(VirtIONet
*n
, int multiqueue
);
449 static uint64_t virtio_net_get_features(VirtIODevice
*vdev
, uint64_t features
)
451 VirtIONet
*n
= VIRTIO_NET(vdev
);
452 NetClientState
*nc
= qemu_get_queue(n
->nic
);
454 /* Firstly sync all virtio-net possible supported features */
455 features
|= n
->host_features
;
457 virtio_add_feature(&features
, VIRTIO_NET_F_MAC
);
459 if (!peer_has_vnet_hdr(n
)) {
460 virtio_clear_feature(&features
, VIRTIO_NET_F_CSUM
);
461 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_TSO4
);
462 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_TSO6
);
463 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_ECN
);
465 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_CSUM
);
466 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_TSO4
);
467 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_TSO6
);
468 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_ECN
);
471 if (!peer_has_vnet_hdr(n
) || !peer_has_ufo(n
)) {
472 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_UFO
);
473 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_UFO
);
476 if (!get_vhost_net(nc
->peer
)) {
479 return vhost_net_get_features(get_vhost_net(nc
->peer
), features
);
482 static uint64_t virtio_net_bad_features(VirtIODevice
*vdev
)
484 uint64_t features
= 0;
486 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
488 virtio_add_feature(&features
, VIRTIO_NET_F_MAC
);
489 virtio_add_feature(&features
, VIRTIO_NET_F_CSUM
);
490 virtio_add_feature(&features
, VIRTIO_NET_F_HOST_TSO4
);
491 virtio_add_feature(&features
, VIRTIO_NET_F_HOST_TSO6
);
492 virtio_add_feature(&features
, VIRTIO_NET_F_HOST_ECN
);
497 static void virtio_net_apply_guest_offloads(VirtIONet
*n
)
499 qemu_set_offload(qemu_get_queue(n
->nic
)->peer
,
500 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_CSUM
)),
501 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_TSO4
)),
502 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_TSO6
)),
503 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_ECN
)),
504 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_UFO
)));
507 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features
)
509 static const uint64_t guest_offloads_mask
=
510 (1ULL << VIRTIO_NET_F_GUEST_CSUM
) |
511 (1ULL << VIRTIO_NET_F_GUEST_TSO4
) |
512 (1ULL << VIRTIO_NET_F_GUEST_TSO6
) |
513 (1ULL << VIRTIO_NET_F_GUEST_ECN
) |
514 (1ULL << VIRTIO_NET_F_GUEST_UFO
);
516 return guest_offloads_mask
& features
;
519 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet
*n
)
521 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
522 return virtio_net_guest_offloads_by_features(vdev
->guest_features
);
525 static void virtio_net_set_features(VirtIODevice
*vdev
, uint64_t features
)
527 VirtIONet
*n
= VIRTIO_NET(vdev
);
530 virtio_net_set_multiqueue(n
,
531 __virtio_has_feature(features
, VIRTIO_NET_F_MQ
));
533 virtio_net_set_mrg_rx_bufs(n
,
534 __virtio_has_feature(features
,
535 VIRTIO_NET_F_MRG_RXBUF
),
536 __virtio_has_feature(features
,
537 VIRTIO_F_VERSION_1
));
539 if (n
->has_vnet_hdr
) {
540 n
->curr_guest_offloads
=
541 virtio_net_guest_offloads_by_features(features
);
542 virtio_net_apply_guest_offloads(n
);
545 for (i
= 0; i
< n
->max_queues
; i
++) {
546 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, i
);
548 if (!get_vhost_net(nc
->peer
)) {
551 vhost_net_ack_features(get_vhost_net(nc
->peer
), features
);
554 if (__virtio_has_feature(features
, VIRTIO_NET_F_CTRL_VLAN
)) {
555 memset(n
->vlans
, 0, MAX_VLAN
>> 3);
557 memset(n
->vlans
, 0xff, MAX_VLAN
>> 3);
561 static int virtio_net_handle_rx_mode(VirtIONet
*n
, uint8_t cmd
,
562 struct iovec
*iov
, unsigned int iov_cnt
)
566 NetClientState
*nc
= qemu_get_queue(n
->nic
);
568 s
= iov_to_buf(iov
, iov_cnt
, 0, &on
, sizeof(on
));
569 if (s
!= sizeof(on
)) {
570 return VIRTIO_NET_ERR
;
573 if (cmd
== VIRTIO_NET_CTRL_RX_PROMISC
) {
575 } else if (cmd
== VIRTIO_NET_CTRL_RX_ALLMULTI
) {
577 } else if (cmd
== VIRTIO_NET_CTRL_RX_ALLUNI
) {
579 } else if (cmd
== VIRTIO_NET_CTRL_RX_NOMULTI
) {
581 } else if (cmd
== VIRTIO_NET_CTRL_RX_NOUNI
) {
583 } else if (cmd
== VIRTIO_NET_CTRL_RX_NOBCAST
) {
586 return VIRTIO_NET_ERR
;
591 return VIRTIO_NET_OK
;
594 static int virtio_net_handle_offloads(VirtIONet
*n
, uint8_t cmd
,
595 struct iovec
*iov
, unsigned int iov_cnt
)
597 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
601 if (!virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
)) {
602 return VIRTIO_NET_ERR
;
605 s
= iov_to_buf(iov
, iov_cnt
, 0, &offloads
, sizeof(offloads
));
606 if (s
!= sizeof(offloads
)) {
607 return VIRTIO_NET_ERR
;
610 if (cmd
== VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET
) {
611 uint64_t supported_offloads
;
613 if (!n
->has_vnet_hdr
) {
614 return VIRTIO_NET_ERR
;
617 supported_offloads
= virtio_net_supported_guest_offloads(n
);
618 if (offloads
& ~supported_offloads
) {
619 return VIRTIO_NET_ERR
;
622 n
->curr_guest_offloads
= offloads
;
623 virtio_net_apply_guest_offloads(n
);
625 return VIRTIO_NET_OK
;
627 return VIRTIO_NET_ERR
;
631 static int virtio_net_handle_mac(VirtIONet
*n
, uint8_t cmd
,
632 struct iovec
*iov
, unsigned int iov_cnt
)
634 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
635 struct virtio_net_ctrl_mac mac_data
;
637 NetClientState
*nc
= qemu_get_queue(n
->nic
);
639 if (cmd
== VIRTIO_NET_CTRL_MAC_ADDR_SET
) {
640 if (iov_size(iov
, iov_cnt
) != sizeof(n
->mac
)) {
641 return VIRTIO_NET_ERR
;
643 s
= iov_to_buf(iov
, iov_cnt
, 0, &n
->mac
, sizeof(n
->mac
));
644 assert(s
== sizeof(n
->mac
));
645 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->mac
);
648 return VIRTIO_NET_OK
;
651 if (cmd
!= VIRTIO_NET_CTRL_MAC_TABLE_SET
) {
652 return VIRTIO_NET_ERR
;
657 uint8_t uni_overflow
= 0;
658 uint8_t multi_overflow
= 0;
659 uint8_t *macs
= g_malloc0(MAC_TABLE_ENTRIES
* ETH_ALEN
);
661 s
= iov_to_buf(iov
, iov_cnt
, 0, &mac_data
.entries
,
662 sizeof(mac_data
.entries
));
663 mac_data
.entries
= virtio_ldl_p(vdev
, &mac_data
.entries
);
664 if (s
!= sizeof(mac_data
.entries
)) {
667 iov_discard_front(&iov
, &iov_cnt
, s
);
669 if (mac_data
.entries
* ETH_ALEN
> iov_size(iov
, iov_cnt
)) {
673 if (mac_data
.entries
<= MAC_TABLE_ENTRIES
) {
674 s
= iov_to_buf(iov
, iov_cnt
, 0, macs
,
675 mac_data
.entries
* ETH_ALEN
);
676 if (s
!= mac_data
.entries
* ETH_ALEN
) {
679 in_use
+= mac_data
.entries
;
684 iov_discard_front(&iov
, &iov_cnt
, mac_data
.entries
* ETH_ALEN
);
686 first_multi
= in_use
;
688 s
= iov_to_buf(iov
, iov_cnt
, 0, &mac_data
.entries
,
689 sizeof(mac_data
.entries
));
690 mac_data
.entries
= virtio_ldl_p(vdev
, &mac_data
.entries
);
691 if (s
!= sizeof(mac_data
.entries
)) {
695 iov_discard_front(&iov
, &iov_cnt
, s
);
697 if (mac_data
.entries
* ETH_ALEN
!= iov_size(iov
, iov_cnt
)) {
701 if (mac_data
.entries
<= MAC_TABLE_ENTRIES
- in_use
) {
702 s
= iov_to_buf(iov
, iov_cnt
, 0, &macs
[in_use
* ETH_ALEN
],
703 mac_data
.entries
* ETH_ALEN
);
704 if (s
!= mac_data
.entries
* ETH_ALEN
) {
707 in_use
+= mac_data
.entries
;
712 n
->mac_table
.in_use
= in_use
;
713 n
->mac_table
.first_multi
= first_multi
;
714 n
->mac_table
.uni_overflow
= uni_overflow
;
715 n
->mac_table
.multi_overflow
= multi_overflow
;
716 memcpy(n
->mac_table
.macs
, macs
, MAC_TABLE_ENTRIES
* ETH_ALEN
);
720 return VIRTIO_NET_OK
;
724 return VIRTIO_NET_ERR
;
727 static int virtio_net_handle_vlan_table(VirtIONet
*n
, uint8_t cmd
,
728 struct iovec
*iov
, unsigned int iov_cnt
)
730 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
733 NetClientState
*nc
= qemu_get_queue(n
->nic
);
735 s
= iov_to_buf(iov
, iov_cnt
, 0, &vid
, sizeof(vid
));
736 vid
= virtio_lduw_p(vdev
, &vid
);
737 if (s
!= sizeof(vid
)) {
738 return VIRTIO_NET_ERR
;
742 return VIRTIO_NET_ERR
;
744 if (cmd
== VIRTIO_NET_CTRL_VLAN_ADD
)
745 n
->vlans
[vid
>> 5] |= (1U << (vid
& 0x1f));
746 else if (cmd
== VIRTIO_NET_CTRL_VLAN_DEL
)
747 n
->vlans
[vid
>> 5] &= ~(1U << (vid
& 0x1f));
749 return VIRTIO_NET_ERR
;
753 return VIRTIO_NET_OK
;
756 static int virtio_net_handle_announce(VirtIONet
*n
, uint8_t cmd
,
757 struct iovec
*iov
, unsigned int iov_cnt
)
759 if (cmd
== VIRTIO_NET_CTRL_ANNOUNCE_ACK
&&
760 n
->status
& VIRTIO_NET_S_ANNOUNCE
) {
761 n
->status
&= ~VIRTIO_NET_S_ANNOUNCE
;
762 if (n
->announce_counter
) {
763 timer_mod(n
->announce_timer
,
764 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL
) +
765 self_announce_delay(n
->announce_counter
));
767 return VIRTIO_NET_OK
;
769 return VIRTIO_NET_ERR
;
773 static int virtio_net_handle_mq(VirtIONet
*n
, uint8_t cmd
,
774 struct iovec
*iov
, unsigned int iov_cnt
)
776 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
777 struct virtio_net_ctrl_mq mq
;
781 s
= iov_to_buf(iov
, iov_cnt
, 0, &mq
, sizeof(mq
));
782 if (s
!= sizeof(mq
)) {
783 return VIRTIO_NET_ERR
;
786 if (cmd
!= VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
) {
787 return VIRTIO_NET_ERR
;
790 queues
= virtio_lduw_p(vdev
, &mq
.virtqueue_pairs
);
792 if (queues
< VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN
||
793 queues
> VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX
||
794 queues
> n
->max_queues
||
796 return VIRTIO_NET_ERR
;
799 n
->curr_queues
= queues
;
800 /* stop the backend before changing the number of queues to avoid handling a
802 virtio_net_set_status(vdev
, vdev
->status
);
803 virtio_net_set_queues(n
);
805 return VIRTIO_NET_OK
;
807 static void virtio_net_handle_ctrl(VirtIODevice
*vdev
, VirtQueue
*vq
)
809 VirtIONet
*n
= VIRTIO_NET(vdev
);
810 struct virtio_net_ctrl_hdr ctrl
;
811 virtio_net_ctrl_ack status
= VIRTIO_NET_ERR
;
812 VirtQueueElement elem
;
814 struct iovec
*iov
, *iov2
;
815 unsigned int iov_cnt
;
817 while (virtqueue_pop(vq
, &elem
)) {
818 if (iov_size(elem
.in_sg
, elem
.in_num
) < sizeof(status
) ||
819 iov_size(elem
.out_sg
, elem
.out_num
) < sizeof(ctrl
)) {
820 error_report("virtio-net ctrl missing headers");
824 iov_cnt
= elem
.out_num
;
825 iov2
= iov
= g_memdup(elem
.out_sg
, sizeof(struct iovec
) * elem
.out_num
);
826 s
= iov_to_buf(iov
, iov_cnt
, 0, &ctrl
, sizeof(ctrl
));
827 iov_discard_front(&iov
, &iov_cnt
, sizeof(ctrl
));
828 if (s
!= sizeof(ctrl
)) {
829 status
= VIRTIO_NET_ERR
;
830 } else if (ctrl
.class == VIRTIO_NET_CTRL_RX
) {
831 status
= virtio_net_handle_rx_mode(n
, ctrl
.cmd
, iov
, iov_cnt
);
832 } else if (ctrl
.class == VIRTIO_NET_CTRL_MAC
) {
833 status
= virtio_net_handle_mac(n
, ctrl
.cmd
, iov
, iov_cnt
);
834 } else if (ctrl
.class == VIRTIO_NET_CTRL_VLAN
) {
835 status
= virtio_net_handle_vlan_table(n
, ctrl
.cmd
, iov
, iov_cnt
);
836 } else if (ctrl
.class == VIRTIO_NET_CTRL_ANNOUNCE
) {
837 status
= virtio_net_handle_announce(n
, ctrl
.cmd
, iov
, iov_cnt
);
838 } else if (ctrl
.class == VIRTIO_NET_CTRL_MQ
) {
839 status
= virtio_net_handle_mq(n
, ctrl
.cmd
, iov
, iov_cnt
);
840 } else if (ctrl
.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS
) {
841 status
= virtio_net_handle_offloads(n
, ctrl
.cmd
, iov
, iov_cnt
);
844 s
= iov_from_buf(elem
.in_sg
, elem
.in_num
, 0, &status
, sizeof(status
));
845 assert(s
== sizeof(status
));
847 virtqueue_push(vq
, &elem
, sizeof(status
));
848 virtio_notify(vdev
, vq
);
855 static void virtio_net_handle_rx(VirtIODevice
*vdev
, VirtQueue
*vq
)
857 VirtIONet
*n
= VIRTIO_NET(vdev
);
858 int queue_index
= vq2q(virtio_get_queue_index(vq
));
860 qemu_flush_queued_packets(qemu_get_subqueue(n
->nic
, queue_index
));
863 static int virtio_net_can_receive(NetClientState
*nc
)
865 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
866 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
867 VirtIONetQueue
*q
= virtio_net_get_subqueue(nc
);
869 if (!vdev
->vm_running
) {
873 if (nc
->queue_index
>= n
->curr_queues
) {
877 if (!virtio_queue_ready(q
->rx_vq
) ||
878 !(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
885 static int virtio_net_has_buffers(VirtIONetQueue
*q
, int bufsize
)
888 if (virtio_queue_empty(q
->rx_vq
) ||
889 (n
->mergeable_rx_bufs
&&
890 !virtqueue_avail_bytes(q
->rx_vq
, bufsize
, 0))) {
891 virtio_queue_set_notification(q
->rx_vq
, 1);
893 /* To avoid a race condition where the guest has made some buffers
894 * available after the above check but before notification was
895 * enabled, check for available buffers again.
897 if (virtio_queue_empty(q
->rx_vq
) ||
898 (n
->mergeable_rx_bufs
&&
899 !virtqueue_avail_bytes(q
->rx_vq
, bufsize
, 0))) {
904 virtio_queue_set_notification(q
->rx_vq
, 0);
908 static void virtio_net_hdr_swap(VirtIODevice
*vdev
, struct virtio_net_hdr
*hdr
)
910 virtio_tswap16s(vdev
, &hdr
->hdr_len
);
911 virtio_tswap16s(vdev
, &hdr
->gso_size
);
912 virtio_tswap16s(vdev
, &hdr
->csum_start
);
913 virtio_tswap16s(vdev
, &hdr
->csum_offset
);
916 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
917 * it never finds out that the packets don't have valid checksums. This
918 * causes dhclient to get upset. Fedora's carried a patch for ages to
919 * fix this with Xen but it hasn't appeared in an upstream release of
922 * To avoid breaking existing guests, we catch udp packets and add
923 * checksums. This is terrible but it's better than hacking the guest
926 * N.B. if we introduce a zero-copy API, this operation is no longer free so
927 * we should provide a mechanism to disable it to avoid polluting the host
930 static void work_around_broken_dhclient(struct virtio_net_hdr
*hdr
,
931 uint8_t *buf
, size_t size
)
933 if ((hdr
->flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) && /* missing csum */
934 (size
> 27 && size
< 1500) && /* normal sized MTU */
935 (buf
[12] == 0x08 && buf
[13] == 0x00) && /* ethertype == IPv4 */
936 (buf
[23] == 17) && /* ip.protocol == UDP */
937 (buf
[34] == 0 && buf
[35] == 67)) { /* udp.srcport == bootps */
938 net_checksum_calculate(buf
, size
);
939 hdr
->flags
&= ~VIRTIO_NET_HDR_F_NEEDS_CSUM
;
943 static void receive_header(VirtIONet
*n
, const struct iovec
*iov
, int iov_cnt
,
944 const void *buf
, size_t size
)
946 if (n
->has_vnet_hdr
) {
947 /* FIXME this cast is evil */
948 void *wbuf
= (void *)buf
;
949 work_around_broken_dhclient(wbuf
, wbuf
+ n
->host_hdr_len
,
950 size
- n
->host_hdr_len
);
951 virtio_net_hdr_swap(VIRTIO_DEVICE(n
), wbuf
);
952 iov_from_buf(iov
, iov_cnt
, 0, buf
, sizeof(struct virtio_net_hdr
));
954 struct virtio_net_hdr hdr
= {
956 .gso_type
= VIRTIO_NET_HDR_GSO_NONE
958 iov_from_buf(iov
, iov_cnt
, 0, &hdr
, sizeof hdr
);
962 static int receive_filter(VirtIONet
*n
, const uint8_t *buf
, int size
)
964 static const uint8_t bcast
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
965 static const uint8_t vlan
[] = {0x81, 0x00};
966 uint8_t *ptr
= (uint8_t *)buf
;
972 ptr
+= n
->host_hdr_len
;
974 if (!memcmp(&ptr
[12], vlan
, sizeof(vlan
))) {
975 int vid
= be16_to_cpup((uint16_t *)(ptr
+ 14)) & 0xfff;
976 if (!(n
->vlans
[vid
>> 5] & (1U << (vid
& 0x1f))))
980 if (ptr
[0] & 1) { // multicast
981 if (!memcmp(ptr
, bcast
, sizeof(bcast
))) {
983 } else if (n
->nomulti
) {
985 } else if (n
->allmulti
|| n
->mac_table
.multi_overflow
) {
989 for (i
= n
->mac_table
.first_multi
; i
< n
->mac_table
.in_use
; i
++) {
990 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
997 } else if (n
->alluni
|| n
->mac_table
.uni_overflow
) {
999 } else if (!memcmp(ptr
, n
->mac
, ETH_ALEN
)) {
1003 for (i
= 0; i
< n
->mac_table
.first_multi
; i
++) {
1004 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
1013 static ssize_t
virtio_net_receive(NetClientState
*nc
, const uint8_t *buf
, size_t size
)
1015 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
1016 VirtIONetQueue
*q
= virtio_net_get_subqueue(nc
);
1017 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1018 struct iovec mhdr_sg
[VIRTQUEUE_MAX_SIZE
];
1019 struct virtio_net_hdr_mrg_rxbuf mhdr
;
1020 unsigned mhdr_cnt
= 0;
1021 size_t offset
, i
, guest_offset
;
1023 if (!virtio_net_can_receive(nc
)) {
1027 /* hdr_len refers to the header we supply to the guest */
1028 if (!virtio_net_has_buffers(q
, size
+ n
->guest_hdr_len
- n
->host_hdr_len
)) {
1032 if (!receive_filter(n
, buf
, size
))
1037 while (offset
< size
) {
1038 VirtQueueElement elem
;
1040 const struct iovec
*sg
= elem
.in_sg
;
1044 if (virtqueue_pop(q
->rx_vq
, &elem
) == 0) {
1047 error_report("virtio-net unexpected empty queue: "
1048 "i %zd mergeable %d offset %zd, size %zd, "
1049 "guest hdr len %zd, host hdr len %zd "
1050 "guest features 0x%" PRIx64
,
1051 i
, n
->mergeable_rx_bufs
, offset
, size
,
1052 n
->guest_hdr_len
, n
->host_hdr_len
,
1053 vdev
->guest_features
);
1057 if (elem
.in_num
< 1) {
1058 error_report("virtio-net receive queue contains no in buffers");
1063 assert(offset
== 0);
1064 if (n
->mergeable_rx_bufs
) {
1065 mhdr_cnt
= iov_copy(mhdr_sg
, ARRAY_SIZE(mhdr_sg
),
1067 offsetof(typeof(mhdr
), num_buffers
),
1068 sizeof(mhdr
.num_buffers
));
1071 receive_header(n
, sg
, elem
.in_num
, buf
, size
);
1072 offset
= n
->host_hdr_len
;
1073 total
+= n
->guest_hdr_len
;
1074 guest_offset
= n
->guest_hdr_len
;
1079 /* copy in packet. ugh */
1080 len
= iov_from_buf(sg
, elem
.in_num
, guest_offset
,
1081 buf
+ offset
, size
- offset
);
1084 /* If buffers can't be merged, at this point we
1085 * must have consumed the complete packet.
1086 * Otherwise, drop it. */
1087 if (!n
->mergeable_rx_bufs
&& offset
< size
) {
1089 error_report("virtio-net truncated non-mergeable packet: "
1090 "i %zd mergeable %d offset %zd, size %zd, "
1091 "guest hdr len %zd, host hdr len %zd",
1092 i
, n
->mergeable_rx_bufs
,
1093 offset
, size
, n
->guest_hdr_len
, n
->host_hdr_len
);
1098 /* signal other side */
1099 virtqueue_fill(q
->rx_vq
, &elem
, total
, i
++);
1103 virtio_stw_p(vdev
, &mhdr
.num_buffers
, i
);
1104 iov_from_buf(mhdr_sg
, mhdr_cnt
,
1106 &mhdr
.num_buffers
, sizeof mhdr
.num_buffers
);
1109 virtqueue_flush(q
->rx_vq
, i
);
1110 virtio_notify(vdev
, q
->rx_vq
);
1115 static int32_t virtio_net_flush_tx(VirtIONetQueue
*q
);
1117 static void virtio_net_tx_complete(NetClientState
*nc
, ssize_t len
)
1119 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
1120 VirtIONetQueue
*q
= virtio_net_get_subqueue(nc
);
1121 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1123 virtqueue_push(q
->tx_vq
, &q
->async_tx
.elem
, 0);
1124 virtio_notify(vdev
, q
->tx_vq
);
1126 q
->async_tx
.elem
.out_num
= q
->async_tx
.len
= 0;
1128 virtio_queue_set_notification(q
->tx_vq
, 1);
1129 virtio_net_flush_tx(q
);
1133 static int32_t virtio_net_flush_tx(VirtIONetQueue
*q
)
1135 VirtIONet
*n
= q
->n
;
1136 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1137 VirtQueueElement elem
;
1138 int32_t num_packets
= 0;
1139 int queue_index
= vq2q(virtio_get_queue_index(q
->tx_vq
));
1140 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1144 if (q
->async_tx
.elem
.out_num
) {
1145 virtio_queue_set_notification(q
->tx_vq
, 0);
1149 while (virtqueue_pop(q
->tx_vq
, &elem
)) {
1151 unsigned int out_num
= elem
.out_num
;
1152 struct iovec
*out_sg
= &elem
.out_sg
[0];
1153 struct iovec sg
[VIRTQUEUE_MAX_SIZE
], sg2
[VIRTQUEUE_MAX_SIZE
+ 1];
1154 struct virtio_net_hdr_mrg_rxbuf mhdr
;
1157 error_report("virtio-net header not in first element");
1161 if (n
->has_vnet_hdr
) {
1162 if (iov_to_buf(out_sg
, out_num
, 0, &mhdr
, n
->guest_hdr_len
) <
1164 error_report("virtio-net header incorrect");
1167 if (virtio_needs_swap(vdev
)) {
1168 virtio_net_hdr_swap(vdev
, (void *) &mhdr
);
1169 sg2
[0].iov_base
= &mhdr
;
1170 sg2
[0].iov_len
= n
->guest_hdr_len
;
1171 out_num
= iov_copy(&sg2
[1], ARRAY_SIZE(sg2
) - 1,
1173 n
->guest_hdr_len
, -1);
1174 if (out_num
== VIRTQUEUE_MAX_SIZE
) {
1182 * If host wants to see the guest header as is, we can
1183 * pass it on unchanged. Otherwise, copy just the parts
1184 * that host is interested in.
1186 assert(n
->host_hdr_len
<= n
->guest_hdr_len
);
1187 if (n
->host_hdr_len
!= n
->guest_hdr_len
) {
1188 unsigned sg_num
= iov_copy(sg
, ARRAY_SIZE(sg
),
1190 0, n
->host_hdr_len
);
1191 sg_num
+= iov_copy(sg
+ sg_num
, ARRAY_SIZE(sg
) - sg_num
,
1193 n
->guest_hdr_len
, -1);
1198 len
= n
->guest_hdr_len
;
1200 ret
= qemu_sendv_packet_async(qemu_get_subqueue(n
->nic
, queue_index
),
1201 out_sg
, out_num
, virtio_net_tx_complete
);
1203 virtio_queue_set_notification(q
->tx_vq
, 0);
1204 q
->async_tx
.elem
= elem
;
1205 q
->async_tx
.len
= len
;
1211 virtqueue_push(q
->tx_vq
, &elem
, 0);
1212 virtio_notify(vdev
, q
->tx_vq
);
1214 if (++num_packets
>= n
->tx_burst
) {
1221 static void virtio_net_handle_tx_timer(VirtIODevice
*vdev
, VirtQueue
*vq
)
1223 VirtIONet
*n
= VIRTIO_NET(vdev
);
1224 VirtIONetQueue
*q
= &n
->vqs
[vq2q(virtio_get_queue_index(vq
))];
1226 /* This happens when device was stopped but VCPU wasn't. */
1227 if (!vdev
->vm_running
) {
1232 if (q
->tx_waiting
) {
1233 virtio_queue_set_notification(vq
, 1);
1234 timer_del(q
->tx_timer
);
1236 virtio_net_flush_tx(q
);
1238 timer_mod(q
->tx_timer
,
1239 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
) + n
->tx_timeout
);
1241 virtio_queue_set_notification(vq
, 0);
1245 static void virtio_net_handle_tx_bh(VirtIODevice
*vdev
, VirtQueue
*vq
)
1247 VirtIONet
*n
= VIRTIO_NET(vdev
);
1248 VirtIONetQueue
*q
= &n
->vqs
[vq2q(virtio_get_queue_index(vq
))];
1250 if (unlikely(q
->tx_waiting
)) {
1254 /* This happens when device was stopped but VCPU wasn't. */
1255 if (!vdev
->vm_running
) {
1258 virtio_queue_set_notification(vq
, 0);
1259 qemu_bh_schedule(q
->tx_bh
);
1262 static void virtio_net_tx_timer(void *opaque
)
1264 VirtIONetQueue
*q
= opaque
;
1265 VirtIONet
*n
= q
->n
;
1266 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1267 /* This happens when device was stopped but BH wasn't. */
1268 if (!vdev
->vm_running
) {
1269 /* Make sure tx waiting is set, so we'll run when restarted. */
1270 assert(q
->tx_waiting
);
1276 /* Just in case the driver is not ready on more */
1277 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1281 virtio_queue_set_notification(q
->tx_vq
, 1);
1282 virtio_net_flush_tx(q
);
1285 static void virtio_net_tx_bh(void *opaque
)
1287 VirtIONetQueue
*q
= opaque
;
1288 VirtIONet
*n
= q
->n
;
1289 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1292 /* This happens when device was stopped but BH wasn't. */
1293 if (!vdev
->vm_running
) {
1294 /* Make sure tx waiting is set, so we'll run when restarted. */
1295 assert(q
->tx_waiting
);
1301 /* Just in case the driver is not ready on more */
1302 if (unlikely(!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
))) {
1306 ret
= virtio_net_flush_tx(q
);
1307 if (ret
== -EBUSY
) {
1308 return; /* Notification re-enable handled by tx_complete */
1311 /* If we flush a full burst of packets, assume there are
1312 * more coming and immediately reschedule */
1313 if (ret
>= n
->tx_burst
) {
1314 qemu_bh_schedule(q
->tx_bh
);
1319 /* If less than a full burst, re-enable notification and flush
1320 * anything that may have come in while we weren't looking. If
1321 * we find something, assume the guest is still active and reschedule */
1322 virtio_queue_set_notification(q
->tx_vq
, 1);
1323 if (virtio_net_flush_tx(q
) > 0) {
1324 virtio_queue_set_notification(q
->tx_vq
, 0);
1325 qemu_bh_schedule(q
->tx_bh
);
1330 static void virtio_net_set_multiqueue(VirtIONet
*n
, int multiqueue
)
1332 n
->multiqueue
= multiqueue
;
1334 virtio_net_set_queues(n
);
1337 static void virtio_net_save(QEMUFile
*f
, void *opaque
)
1339 VirtIONet
*n
= opaque
;
1340 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1342 /* At this point, backend must be stopped, otherwise
1343 * it might keep writing to memory. */
1344 assert(!n
->vhost_started
);
1345 virtio_save(vdev
, f
);
1348 static void virtio_net_save_device(VirtIODevice
*vdev
, QEMUFile
*f
)
1350 VirtIONet
*n
= VIRTIO_NET(vdev
);
1353 qemu_put_buffer(f
, n
->mac
, ETH_ALEN
);
1354 qemu_put_be32(f
, n
->vqs
[0].tx_waiting
);
1355 qemu_put_be32(f
, n
->mergeable_rx_bufs
);
1356 qemu_put_be16(f
, n
->status
);
1357 qemu_put_byte(f
, n
->promisc
);
1358 qemu_put_byte(f
, n
->allmulti
);
1359 qemu_put_be32(f
, n
->mac_table
.in_use
);
1360 qemu_put_buffer(f
, n
->mac_table
.macs
, n
->mac_table
.in_use
* ETH_ALEN
);
1361 qemu_put_buffer(f
, (uint8_t *)n
->vlans
, MAX_VLAN
>> 3);
1362 qemu_put_be32(f
, n
->has_vnet_hdr
);
1363 qemu_put_byte(f
, n
->mac_table
.multi_overflow
);
1364 qemu_put_byte(f
, n
->mac_table
.uni_overflow
);
1365 qemu_put_byte(f
, n
->alluni
);
1366 qemu_put_byte(f
, n
->nomulti
);
1367 qemu_put_byte(f
, n
->nouni
);
1368 qemu_put_byte(f
, n
->nobcast
);
1369 qemu_put_byte(f
, n
->has_ufo
);
1370 if (n
->max_queues
> 1) {
1371 qemu_put_be16(f
, n
->max_queues
);
1372 qemu_put_be16(f
, n
->curr_queues
);
1373 for (i
= 1; i
< n
->curr_queues
; i
++) {
1374 qemu_put_be32(f
, n
->vqs
[i
].tx_waiting
);
1378 if (virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
)) {
1379 qemu_put_be64(f
, n
->curr_guest_offloads
);
1383 static int virtio_net_load(QEMUFile
*f
, void *opaque
, int version_id
)
1385 VirtIONet
*n
= opaque
;
1386 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1388 if (version_id
< 2 || version_id
> VIRTIO_NET_VM_VERSION
)
1391 return virtio_load(vdev
, f
, version_id
);
1394 static int virtio_net_load_device(VirtIODevice
*vdev
, QEMUFile
*f
,
1397 VirtIONet
*n
= VIRTIO_NET(vdev
);
1400 qemu_get_buffer(f
, n
->mac
, ETH_ALEN
);
1401 n
->vqs
[0].tx_waiting
= qemu_get_be32(f
);
1403 virtio_net_set_mrg_rx_bufs(n
, qemu_get_be32(f
),
1404 virtio_has_feature(vdev
, VIRTIO_F_VERSION_1
));
1406 if (version_id
>= 3)
1407 n
->status
= qemu_get_be16(f
);
1409 if (version_id
>= 4) {
1410 if (version_id
< 8) {
1411 n
->promisc
= qemu_get_be32(f
);
1412 n
->allmulti
= qemu_get_be32(f
);
1414 n
->promisc
= qemu_get_byte(f
);
1415 n
->allmulti
= qemu_get_byte(f
);
1419 if (version_id
>= 5) {
1420 n
->mac_table
.in_use
= qemu_get_be32(f
);
1421 /* MAC_TABLE_ENTRIES may be different from the saved image */
1422 if (n
->mac_table
.in_use
<= MAC_TABLE_ENTRIES
) {
1423 qemu_get_buffer(f
, n
->mac_table
.macs
,
1424 n
->mac_table
.in_use
* ETH_ALEN
);
1428 /* Overflow detected - can happen if source has a larger MAC table.
1429 * We simply set overflow flag so there's no need to maintain the
1430 * table of addresses, discard them all.
1431 * Note: 64 bit math to avoid integer overflow.
1433 for (i
= 0; i
< (int64_t)n
->mac_table
.in_use
* ETH_ALEN
; ++i
) {
1436 n
->mac_table
.multi_overflow
= n
->mac_table
.uni_overflow
= 1;
1437 n
->mac_table
.in_use
= 0;
1441 if (version_id
>= 6)
1442 qemu_get_buffer(f
, (uint8_t *)n
->vlans
, MAX_VLAN
>> 3);
1444 if (version_id
>= 7) {
1445 if (qemu_get_be32(f
) && !peer_has_vnet_hdr(n
)) {
1446 error_report("virtio-net: saved image requires vnet_hdr=on");
1451 if (version_id
>= 9) {
1452 n
->mac_table
.multi_overflow
= qemu_get_byte(f
);
1453 n
->mac_table
.uni_overflow
= qemu_get_byte(f
);
1456 if (version_id
>= 10) {
1457 n
->alluni
= qemu_get_byte(f
);
1458 n
->nomulti
= qemu_get_byte(f
);
1459 n
->nouni
= qemu_get_byte(f
);
1460 n
->nobcast
= qemu_get_byte(f
);
1463 if (version_id
>= 11) {
1464 if (qemu_get_byte(f
) && !peer_has_ufo(n
)) {
1465 error_report("virtio-net: saved image requires TUN_F_UFO support");
1470 if (n
->max_queues
> 1) {
1471 if (n
->max_queues
!= qemu_get_be16(f
)) {
1472 error_report("virtio-net: different max_queues ");
1476 n
->curr_queues
= qemu_get_be16(f
);
1477 if (n
->curr_queues
> n
->max_queues
) {
1478 error_report("virtio-net: curr_queues %x > max_queues %x",
1479 n
->curr_queues
, n
->max_queues
);
1482 for (i
= 1; i
< n
->curr_queues
; i
++) {
1483 n
->vqs
[i
].tx_waiting
= qemu_get_be32(f
);
1487 if (virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
)) {
1488 n
->curr_guest_offloads
= qemu_get_be64(f
);
1490 n
->curr_guest_offloads
= virtio_net_supported_guest_offloads(n
);
1493 if (peer_has_vnet_hdr(n
)) {
1494 virtio_net_apply_guest_offloads(n
);
1497 virtio_net_set_queues(n
);
1499 /* Find the first multicast entry in the saved MAC filter */
1500 for (i
= 0; i
< n
->mac_table
.in_use
; i
++) {
1501 if (n
->mac_table
.macs
[i
* ETH_ALEN
] & 1) {
1505 n
->mac_table
.first_multi
= i
;
1507 /* nc.link_down can't be migrated, so infer link_down according
1508 * to link status bit in n->status */
1509 link_down
= (n
->status
& VIRTIO_NET_S_LINK_UP
) == 0;
1510 for (i
= 0; i
< n
->max_queues
; i
++) {
1511 qemu_get_subqueue(n
->nic
, i
)->link_down
= link_down
;
1514 if (virtio_has_feature(vdev
, VIRTIO_NET_F_GUEST_ANNOUNCE
) &&
1515 virtio_has_feature(vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
1516 n
->announce_counter
= SELF_ANNOUNCE_ROUNDS
;
1517 timer_mod(n
->announce_timer
, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL
));
1523 static NetClientInfo net_virtio_info
= {
1524 .type
= NET_CLIENT_OPTIONS_KIND_NIC
,
1525 .size
= sizeof(NICState
),
1526 .can_receive
= virtio_net_can_receive
,
1527 .receive
= virtio_net_receive
,
1528 .link_status_changed
= virtio_net_set_link_status
,
1529 .query_rx_filter
= virtio_net_query_rxfilter
,
1532 static bool virtio_net_guest_notifier_pending(VirtIODevice
*vdev
, int idx
)
1534 VirtIONet
*n
= VIRTIO_NET(vdev
);
1535 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, vq2q(idx
));
1536 assert(n
->vhost_started
);
1537 return vhost_net_virtqueue_pending(get_vhost_net(nc
->peer
), idx
);
1540 static void virtio_net_guest_notifier_mask(VirtIODevice
*vdev
, int idx
,
1543 VirtIONet
*n
= VIRTIO_NET(vdev
);
1544 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, vq2q(idx
));
1545 assert(n
->vhost_started
);
1546 vhost_net_virtqueue_mask(get_vhost_net(nc
->peer
),
1550 static void virtio_net_set_config_size(VirtIONet
*n
, uint64_t host_features
)
1552 int i
, config_size
= 0;
1553 virtio_add_feature(&host_features
, VIRTIO_NET_F_MAC
);
1554 for (i
= 0; feature_sizes
[i
].flags
!= 0; i
++) {
1555 if (host_features
& feature_sizes
[i
].flags
) {
1556 config_size
= MAX(feature_sizes
[i
].end
, config_size
);
1559 n
->config_size
= config_size
;
1562 void virtio_net_set_netclient_name(VirtIONet
*n
, const char *name
,
1566 * The name can be NULL, the netclient name will be type.x.
1568 assert(type
!= NULL
);
1570 g_free(n
->netclient_name
);
1571 g_free(n
->netclient_type
);
1572 n
->netclient_name
= g_strdup(name
);
1573 n
->netclient_type
= g_strdup(type
);
1576 static void virtio_net_device_realize(DeviceState
*dev
, Error
**errp
)
1578 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1579 VirtIONet
*n
= VIRTIO_NET(dev
);
1583 virtio_net_set_config_size(n
, n
->host_features
);
1584 virtio_init(vdev
, "virtio-net", VIRTIO_ID_NET
, n
->config_size
);
1586 n
->max_queues
= MAX(n
->nic_conf
.peers
.queues
, 1);
1587 if (n
->max_queues
* 2 + 1 > VIRTIO_QUEUE_MAX
) {
1588 error_setg(errp
, "Invalid number of queues (= %" PRIu32
"), "
1589 "must be a positive integer less than %d.",
1590 n
->max_queues
, (VIRTIO_QUEUE_MAX
- 1) / 2);
1591 virtio_cleanup(vdev
);
1594 n
->vqs
= g_malloc0(sizeof(VirtIONetQueue
) * n
->max_queues
);
1596 n
->tx_timeout
= n
->net_conf
.txtimer
;
1598 if (n
->net_conf
.tx
&& strcmp(n
->net_conf
.tx
, "timer")
1599 && strcmp(n
->net_conf
.tx
, "bh")) {
1600 error_report("virtio-net: "
1601 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1603 error_report("Defaulting to \"bh\"");
1606 for (i
= 0; i
< n
->max_queues
; i
++) {
1607 n
->vqs
[i
].rx_vq
= virtio_add_queue(vdev
, 256, virtio_net_handle_rx
);
1608 if (n
->net_conf
.tx
&& !strcmp(n
->net_conf
.tx
, "timer")) {
1610 virtio_add_queue(vdev
, 256, virtio_net_handle_tx_timer
);
1611 n
->vqs
[i
].tx_timer
= timer_new_ns(QEMU_CLOCK_VIRTUAL
,
1612 virtio_net_tx_timer
,
1616 virtio_add_queue(vdev
, 256, virtio_net_handle_tx_bh
);
1617 n
->vqs
[i
].tx_bh
= qemu_bh_new(virtio_net_tx_bh
, &n
->vqs
[i
]);
1620 n
->vqs
[i
].tx_waiting
= 0;
1624 n
->ctrl_vq
= virtio_add_queue(vdev
, 64, virtio_net_handle_ctrl
);
1625 qemu_macaddr_default_if_unset(&n
->nic_conf
.macaddr
);
1626 memcpy(&n
->mac
[0], &n
->nic_conf
.macaddr
, sizeof(n
->mac
));
1627 n
->status
= VIRTIO_NET_S_LINK_UP
;
1628 n
->announce_timer
= timer_new_ms(QEMU_CLOCK_VIRTUAL
,
1629 virtio_net_announce_timer
, n
);
1631 if (n
->netclient_type
) {
1633 * Happen when virtio_net_set_netclient_name has been called.
1635 n
->nic
= qemu_new_nic(&net_virtio_info
, &n
->nic_conf
,
1636 n
->netclient_type
, n
->netclient_name
, n
);
1638 n
->nic
= qemu_new_nic(&net_virtio_info
, &n
->nic_conf
,
1639 object_get_typename(OBJECT(dev
)), dev
->id
, n
);
1642 peer_test_vnet_hdr(n
);
1643 if (peer_has_vnet_hdr(n
)) {
1644 for (i
= 0; i
< n
->max_queues
; i
++) {
1645 qemu_using_vnet_hdr(qemu_get_subqueue(n
->nic
, i
)->peer
, true);
1647 n
->host_hdr_len
= sizeof(struct virtio_net_hdr
);
1649 n
->host_hdr_len
= 0;
1652 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->nic_conf
.macaddr
.a
);
1654 n
->vqs
[0].tx_waiting
= 0;
1655 n
->tx_burst
= n
->net_conf
.txburst
;
1656 virtio_net_set_mrg_rx_bufs(n
, 0, 0);
1657 n
->promisc
= 1; /* for compatibility */
1659 n
->mac_table
.macs
= g_malloc0(MAC_TABLE_ENTRIES
* ETH_ALEN
);
1661 n
->vlans
= g_malloc0(MAX_VLAN
>> 3);
1663 nc
= qemu_get_queue(n
->nic
);
1664 nc
->rxfilter_notify_enabled
= 1;
1667 register_savevm(dev
, "virtio-net", -1, VIRTIO_NET_VM_VERSION
,
1668 virtio_net_save
, virtio_net_load
, n
);
1671 static void virtio_net_device_unrealize(DeviceState
*dev
, Error
**errp
)
1673 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1674 VirtIONet
*n
= VIRTIO_NET(dev
);
1677 /* This will stop vhost backend if appropriate. */
1678 virtio_net_set_status(vdev
, 0);
1680 unregister_savevm(dev
, "virtio-net", n
);
1682 g_free(n
->netclient_name
);
1683 n
->netclient_name
= NULL
;
1684 g_free(n
->netclient_type
);
1685 n
->netclient_type
= NULL
;
1687 g_free(n
->mac_table
.macs
);
1690 for (i
= 0; i
< n
->max_queues
; i
++) {
1691 VirtIONetQueue
*q
= &n
->vqs
[i
];
1692 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, i
);
1694 qemu_purge_queued_packets(nc
);
1697 timer_del(q
->tx_timer
);
1698 timer_free(q
->tx_timer
);
1699 } else if (q
->tx_bh
) {
1700 qemu_bh_delete(q
->tx_bh
);
1704 timer_del(n
->announce_timer
);
1705 timer_free(n
->announce_timer
);
1707 qemu_del_nic(n
->nic
);
1708 virtio_cleanup(vdev
);
1711 static void virtio_net_instance_init(Object
*obj
)
1713 VirtIONet
*n
= VIRTIO_NET(obj
);
1716 * The default config_size is sizeof(struct virtio_net_config).
1717 * Can be overriden with virtio_net_set_config_size.
1719 n
->config_size
= sizeof(struct virtio_net_config
);
1720 device_add_bootindex_property(obj
, &n
->nic_conf
.bootindex
,
1721 "bootindex", "/ethernet-phy@0",
1725 static Property virtio_net_properties
[] = {
1726 DEFINE_PROP_BIT("any_layout", VirtIONet
, host_features
,
1727 VIRTIO_F_ANY_LAYOUT
, true),
1728 DEFINE_PROP_BIT("csum", VirtIONet
, host_features
, VIRTIO_NET_F_CSUM
, true),
1729 DEFINE_PROP_BIT("guest_csum", VirtIONet
, host_features
,
1730 VIRTIO_NET_F_GUEST_CSUM
, true),
1731 DEFINE_PROP_BIT("gso", VirtIONet
, host_features
, VIRTIO_NET_F_GSO
, true),
1732 DEFINE_PROP_BIT("guest_tso4", VirtIONet
, host_features
,
1733 VIRTIO_NET_F_GUEST_TSO4
, true),
1734 DEFINE_PROP_BIT("guest_tso6", VirtIONet
, host_features
,
1735 VIRTIO_NET_F_GUEST_TSO6
, true),
1736 DEFINE_PROP_BIT("guest_ecn", VirtIONet
, host_features
,
1737 VIRTIO_NET_F_GUEST_ECN
, true),
1738 DEFINE_PROP_BIT("guest_ufo", VirtIONet
, host_features
,
1739 VIRTIO_NET_F_GUEST_UFO
, true),
1740 DEFINE_PROP_BIT("guest_announce", VirtIONet
, host_features
,
1741 VIRTIO_NET_F_GUEST_ANNOUNCE
, true),
1742 DEFINE_PROP_BIT("host_tso4", VirtIONet
, host_features
,
1743 VIRTIO_NET_F_HOST_TSO4
, true),
1744 DEFINE_PROP_BIT("host_tso6", VirtIONet
, host_features
,
1745 VIRTIO_NET_F_HOST_TSO6
, true),
1746 DEFINE_PROP_BIT("host_ecn", VirtIONet
, host_features
,
1747 VIRTIO_NET_F_HOST_ECN
, true),
1748 DEFINE_PROP_BIT("host_ufo", VirtIONet
, host_features
,
1749 VIRTIO_NET_F_HOST_UFO
, true),
1750 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet
, host_features
,
1751 VIRTIO_NET_F_MRG_RXBUF
, true),
1752 DEFINE_PROP_BIT("status", VirtIONet
, host_features
,
1753 VIRTIO_NET_F_STATUS
, true),
1754 DEFINE_PROP_BIT("ctrl_vq", VirtIONet
, host_features
,
1755 VIRTIO_NET_F_CTRL_VQ
, true),
1756 DEFINE_PROP_BIT("ctrl_rx", VirtIONet
, host_features
,
1757 VIRTIO_NET_F_CTRL_RX
, true),
1758 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet
, host_features
,
1759 VIRTIO_NET_F_CTRL_VLAN
, true),
1760 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet
, host_features
,
1761 VIRTIO_NET_F_CTRL_RX_EXTRA
, true),
1762 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet
, host_features
,
1763 VIRTIO_NET_F_CTRL_MAC_ADDR
, true),
1764 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet
, host_features
,
1765 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
, true),
1766 DEFINE_PROP_BIT("mq", VirtIONet
, host_features
, VIRTIO_NET_F_MQ
, false),
1767 DEFINE_NIC_PROPERTIES(VirtIONet
, nic_conf
),
1768 DEFINE_PROP_UINT32("x-txtimer", VirtIONet
, net_conf
.txtimer
,
1770 DEFINE_PROP_INT32("x-txburst", VirtIONet
, net_conf
.txburst
, TX_BURST
),
1771 DEFINE_PROP_STRING("tx", VirtIONet
, net_conf
.tx
),
1772 DEFINE_PROP_END_OF_LIST(),
1775 static void virtio_net_class_init(ObjectClass
*klass
, void *data
)
1777 DeviceClass
*dc
= DEVICE_CLASS(klass
);
1778 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
1780 dc
->props
= virtio_net_properties
;
1781 set_bit(DEVICE_CATEGORY_NETWORK
, dc
->categories
);
1782 vdc
->realize
= virtio_net_device_realize
;
1783 vdc
->unrealize
= virtio_net_device_unrealize
;
1784 vdc
->get_config
= virtio_net_get_config
;
1785 vdc
->set_config
= virtio_net_set_config
;
1786 vdc
->get_features
= virtio_net_get_features
;
1787 vdc
->set_features
= virtio_net_set_features
;
1788 vdc
->bad_features
= virtio_net_bad_features
;
1789 vdc
->reset
= virtio_net_reset
;
1790 vdc
->set_status
= virtio_net_set_status
;
1791 vdc
->guest_notifier_mask
= virtio_net_guest_notifier_mask
;
1792 vdc
->guest_notifier_pending
= virtio_net_guest_notifier_pending
;
1793 vdc
->load
= virtio_net_load_device
;
1794 vdc
->save
= virtio_net_save_device
;
1797 static const TypeInfo virtio_net_info
= {
1798 .name
= TYPE_VIRTIO_NET
,
1799 .parent
= TYPE_VIRTIO_DEVICE
,
1800 .instance_size
= sizeof(VirtIONet
),
1801 .instance_init
= virtio_net_instance_init
,
1802 .class_init
= virtio_net_class_init
,
1805 static void virtio_register_types(void)
1807 type_register_static(&virtio_net_info
);
1810 type_init(virtio_register_types
)