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.
16 #include "net/checksum.h"
18 #include "qemu-timer.h"
19 #include "virtio-net.h"
21 #define VIRTIO_NET_VM_VERSION 11
23 #define MAC_TABLE_ENTRIES 64
24 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
26 typedef struct VirtIONet
29 uint8_t mac
[ETH_ALEN
];
37 uint32_t has_vnet_hdr
;
40 VirtQueueElement elem
;
43 int mergeable_rx_bufs
;
53 uint8_t multi_overflow
;
61 * - we could suppress RX interrupt if we were so inclined.
64 static VirtIONet
*to_virtio_net(VirtIODevice
*vdev
)
66 return (VirtIONet
*)vdev
;
69 static void virtio_net_get_config(VirtIODevice
*vdev
, uint8_t *config
)
71 VirtIONet
*n
= to_virtio_net(vdev
);
72 struct virtio_net_config netcfg
;
74 netcfg
.status
= n
->status
;
75 memcpy(netcfg
.mac
, n
->mac
, ETH_ALEN
);
76 memcpy(config
, &netcfg
, sizeof(netcfg
));
79 static void virtio_net_set_config(VirtIODevice
*vdev
, const uint8_t *config
)
81 VirtIONet
*n
= to_virtio_net(vdev
);
82 struct virtio_net_config netcfg
;
84 memcpy(&netcfg
, config
, sizeof(netcfg
));
86 if (memcmp(netcfg
.mac
, n
->mac
, ETH_ALEN
)) {
87 memcpy(n
->mac
, netcfg
.mac
, ETH_ALEN
);
88 qemu_format_nic_info_str(n
->vc
, n
->mac
);
92 static void virtio_net_set_link_status(VLANClientState
*vc
)
94 VirtIONet
*n
= vc
->opaque
;
95 uint16_t old_status
= n
->status
;
98 n
->status
&= ~VIRTIO_NET_S_LINK_UP
;
100 n
->status
|= VIRTIO_NET_S_LINK_UP
;
102 if (n
->status
!= old_status
)
103 virtio_notify_config(&n
->vdev
);
106 static void virtio_net_reset(VirtIODevice
*vdev
)
108 VirtIONet
*n
= to_virtio_net(vdev
);
110 /* Reset back to compatibility mode */
118 /* Flush any MAC and VLAN filter table state */
119 n
->mac_table
.in_use
= 0;
120 n
->mac_table
.first_multi
= 0;
121 n
->mac_table
.multi_overflow
= 0;
122 n
->mac_table
.uni_overflow
= 0;
123 memset(n
->mac_table
.macs
, 0, MAC_TABLE_ENTRIES
* ETH_ALEN
);
124 memset(n
->vlans
, 0, MAX_VLAN
>> 3);
127 static int peer_has_vnet_hdr(VirtIONet
*n
)
132 if (n
->vc
->peer
->type
!= NET_CLIENT_TYPE_TAP
)
135 n
->has_vnet_hdr
= tap_has_vnet_hdr(n
->vc
->peer
);
137 return n
->has_vnet_hdr
;
140 static int peer_has_ufo(VirtIONet
*n
)
142 if (!peer_has_vnet_hdr(n
))
145 n
->has_ufo
= tap_has_ufo(n
->vc
->peer
);
150 static uint32_t virtio_net_get_features(VirtIODevice
*vdev
)
152 VirtIONet
*n
= to_virtio_net(vdev
);
153 uint32_t features
= (1 << VIRTIO_NET_F_MAC
) |
154 (1 << VIRTIO_NET_F_MRG_RXBUF
) |
155 (1 << VIRTIO_NET_F_STATUS
) |
156 (1 << VIRTIO_NET_F_CTRL_VQ
) |
157 (1 << VIRTIO_NET_F_CTRL_RX
) |
158 (1 << VIRTIO_NET_F_CTRL_VLAN
) |
159 (1 << VIRTIO_NET_F_CTRL_RX_EXTRA
);
161 if (peer_has_vnet_hdr(n
)) {
162 tap_using_vnet_hdr(n
->vc
->peer
, 1);
164 features
|= (1 << VIRTIO_NET_F_CSUM
);
165 features
|= (1 << VIRTIO_NET_F_HOST_TSO4
);
166 features
|= (1 << VIRTIO_NET_F_HOST_TSO6
);
167 features
|= (1 << VIRTIO_NET_F_HOST_ECN
);
169 features
|= (1 << VIRTIO_NET_F_GUEST_CSUM
);
170 features
|= (1 << VIRTIO_NET_F_GUEST_TSO4
);
171 features
|= (1 << VIRTIO_NET_F_GUEST_TSO6
);
172 features
|= (1 << VIRTIO_NET_F_GUEST_ECN
);
174 if (peer_has_ufo(n
)) {
175 features
|= (1 << VIRTIO_NET_F_GUEST_UFO
);
176 features
|= (1 << VIRTIO_NET_F_HOST_UFO
);
183 static uint32_t virtio_net_bad_features(VirtIODevice
*vdev
)
185 uint32_t features
= 0;
187 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
189 features
|= (1 << VIRTIO_NET_F_MAC
);
190 features
|= (1 << VIRTIO_NET_F_GUEST_CSUM
);
191 features
|= (1 << VIRTIO_NET_F_GUEST_TSO4
);
192 features
|= (1 << VIRTIO_NET_F_GUEST_TSO6
);
193 features
|= (1 << VIRTIO_NET_F_GUEST_ECN
);
195 return features
& virtio_net_get_features(vdev
);
198 static void virtio_net_set_features(VirtIODevice
*vdev
, uint32_t features
)
200 VirtIONet
*n
= to_virtio_net(vdev
);
202 n
->mergeable_rx_bufs
= !!(features
& (1 << VIRTIO_NET_F_MRG_RXBUF
));
204 if (n
->has_vnet_hdr
) {
205 tap_set_offload(n
->vc
->peer
,
206 (features
>> VIRTIO_NET_F_GUEST_CSUM
) & 1,
207 (features
>> VIRTIO_NET_F_GUEST_TSO4
) & 1,
208 (features
>> VIRTIO_NET_F_GUEST_TSO6
) & 1,
209 (features
>> VIRTIO_NET_F_GUEST_ECN
) & 1,
210 (features
>> VIRTIO_NET_F_GUEST_UFO
) & 1);
214 static int virtio_net_handle_rx_mode(VirtIONet
*n
, uint8_t cmd
,
215 VirtQueueElement
*elem
)
219 if (elem
->out_num
!= 2 || elem
->out_sg
[1].iov_len
!= sizeof(on
)) {
220 fprintf(stderr
, "virtio-net ctrl invalid rx mode command\n");
224 on
= ldub_p(elem
->out_sg
[1].iov_base
);
226 if (cmd
== VIRTIO_NET_CTRL_RX_MODE_PROMISC
)
228 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_ALLMULTI
)
230 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_ALLUNI
)
232 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_NOMULTI
)
234 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_NOUNI
)
236 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_NOBCAST
)
239 return VIRTIO_NET_ERR
;
241 return VIRTIO_NET_OK
;
244 static int virtio_net_handle_mac(VirtIONet
*n
, uint8_t cmd
,
245 VirtQueueElement
*elem
)
247 struct virtio_net_ctrl_mac mac_data
;
249 if (cmd
!= VIRTIO_NET_CTRL_MAC_TABLE_SET
|| elem
->out_num
!= 3 ||
250 elem
->out_sg
[1].iov_len
< sizeof(mac_data
) ||
251 elem
->out_sg
[2].iov_len
< sizeof(mac_data
))
252 return VIRTIO_NET_ERR
;
254 n
->mac_table
.in_use
= 0;
255 n
->mac_table
.first_multi
= 0;
256 n
->mac_table
.uni_overflow
= 0;
257 n
->mac_table
.multi_overflow
= 0;
258 memset(n
->mac_table
.macs
, 0, MAC_TABLE_ENTRIES
* ETH_ALEN
);
260 mac_data
.entries
= ldl_le_p(elem
->out_sg
[1].iov_base
);
262 if (sizeof(mac_data
.entries
) +
263 (mac_data
.entries
* ETH_ALEN
) > elem
->out_sg
[1].iov_len
)
264 return VIRTIO_NET_ERR
;
266 if (mac_data
.entries
<= MAC_TABLE_ENTRIES
) {
267 memcpy(n
->mac_table
.macs
, elem
->out_sg
[1].iov_base
+ sizeof(mac_data
),
268 mac_data
.entries
* ETH_ALEN
);
269 n
->mac_table
.in_use
+= mac_data
.entries
;
271 n
->mac_table
.uni_overflow
= 1;
274 n
->mac_table
.first_multi
= n
->mac_table
.in_use
;
276 mac_data
.entries
= ldl_le_p(elem
->out_sg
[2].iov_base
);
278 if (sizeof(mac_data
.entries
) +
279 (mac_data
.entries
* ETH_ALEN
) > elem
->out_sg
[2].iov_len
)
280 return VIRTIO_NET_ERR
;
282 if (mac_data
.entries
) {
283 if (n
->mac_table
.in_use
+ mac_data
.entries
<= MAC_TABLE_ENTRIES
) {
284 memcpy(n
->mac_table
.macs
+ (n
->mac_table
.in_use
* ETH_ALEN
),
285 elem
->out_sg
[2].iov_base
+ sizeof(mac_data
),
286 mac_data
.entries
* ETH_ALEN
);
287 n
->mac_table
.in_use
+= mac_data
.entries
;
289 n
->mac_table
.multi_overflow
= 1;
293 return VIRTIO_NET_OK
;
296 static int virtio_net_handle_vlan_table(VirtIONet
*n
, uint8_t cmd
,
297 VirtQueueElement
*elem
)
301 if (elem
->out_num
!= 2 || elem
->out_sg
[1].iov_len
!= sizeof(vid
)) {
302 fprintf(stderr
, "virtio-net ctrl invalid vlan command\n");
303 return VIRTIO_NET_ERR
;
306 vid
= lduw_le_p(elem
->out_sg
[1].iov_base
);
309 return VIRTIO_NET_ERR
;
311 if (cmd
== VIRTIO_NET_CTRL_VLAN_ADD
)
312 n
->vlans
[vid
>> 5] |= (1U << (vid
& 0x1f));
313 else if (cmd
== VIRTIO_NET_CTRL_VLAN_DEL
)
314 n
->vlans
[vid
>> 5] &= ~(1U << (vid
& 0x1f));
316 return VIRTIO_NET_ERR
;
318 return VIRTIO_NET_OK
;
321 static void virtio_net_handle_ctrl(VirtIODevice
*vdev
, VirtQueue
*vq
)
323 VirtIONet
*n
= to_virtio_net(vdev
);
324 struct virtio_net_ctrl_hdr ctrl
;
325 virtio_net_ctrl_ack status
= VIRTIO_NET_ERR
;
326 VirtQueueElement elem
;
328 while (virtqueue_pop(vq
, &elem
)) {
329 if ((elem
.in_num
< 1) || (elem
.out_num
< 1)) {
330 fprintf(stderr
, "virtio-net ctrl missing headers\n");
334 if (elem
.out_sg
[0].iov_len
< sizeof(ctrl
) ||
335 elem
.in_sg
[elem
.in_num
- 1].iov_len
< sizeof(status
)) {
336 fprintf(stderr
, "virtio-net ctrl header not in correct element\n");
340 ctrl
.class = ldub_p(elem
.out_sg
[0].iov_base
);
341 ctrl
.cmd
= ldub_p(elem
.out_sg
[0].iov_base
+ sizeof(ctrl
.class));
343 if (ctrl
.class == VIRTIO_NET_CTRL_RX_MODE
)
344 status
= virtio_net_handle_rx_mode(n
, ctrl
.cmd
, &elem
);
345 else if (ctrl
.class == VIRTIO_NET_CTRL_MAC
)
346 status
= virtio_net_handle_mac(n
, ctrl
.cmd
, &elem
);
347 else if (ctrl
.class == VIRTIO_NET_CTRL_VLAN
)
348 status
= virtio_net_handle_vlan_table(n
, ctrl
.cmd
, &elem
);
350 stb_p(elem
.in_sg
[elem
.in_num
- 1].iov_base
, status
);
352 virtqueue_push(vq
, &elem
, sizeof(status
));
353 virtio_notify(vdev
, vq
);
359 static void virtio_net_handle_rx(VirtIODevice
*vdev
, VirtQueue
*vq
)
361 VirtIONet
*n
= to_virtio_net(vdev
);
363 qemu_flush_queued_packets(n
->vc
);
365 /* We now have RX buffers, signal to the IO thread to break out of the
366 * select to re-poll the tap file descriptor */
370 static int do_virtio_net_can_receive(VirtIONet
*n
, int bufsize
)
372 if (!virtio_queue_ready(n
->rx_vq
) ||
373 !(n
->vdev
.status
& VIRTIO_CONFIG_S_DRIVER_OK
))
376 if (virtio_queue_empty(n
->rx_vq
) ||
377 (n
->mergeable_rx_bufs
&&
378 !virtqueue_avail_bytes(n
->rx_vq
, bufsize
, 0))) {
379 virtio_queue_set_notification(n
->rx_vq
, 1);
383 virtio_queue_set_notification(n
->rx_vq
, 0);
387 static int virtio_net_can_receive(VLANClientState
*vc
)
389 VirtIONet
*n
= vc
->opaque
;
391 return do_virtio_net_can_receive(n
, VIRTIO_NET_MAX_BUFSIZE
);
394 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
395 * it never finds out that the packets don't have valid checksums. This
396 * causes dhclient to get upset. Fedora's carried a patch for ages to
397 * fix this with Xen but it hasn't appeared in an upstream release of
400 * To avoid breaking existing guests, we catch udp packets and add
401 * checksums. This is terrible but it's better than hacking the guest
404 * N.B. if we introduce a zero-copy API, this operation is no longer free so
405 * we should provide a mechanism to disable it to avoid polluting the host
408 static void work_around_broken_dhclient(struct virtio_net_hdr
*hdr
,
409 const uint8_t *buf
, size_t size
)
411 if ((hdr
->flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) && /* missing csum */
412 (size
> 27 && size
< 1500) && /* normal sized MTU */
413 (buf
[12] == 0x08 && buf
[13] == 0x00) && /* ethertype == IPv4 */
414 (buf
[23] == 17) && /* ip.protocol == UDP */
415 (buf
[34] == 0 && buf
[35] == 67)) { /* udp.srcport == bootps */
416 /* FIXME this cast is evil */
417 net_checksum_calculate((uint8_t *)buf
, size
);
418 hdr
->flags
&= ~VIRTIO_NET_HDR_F_NEEDS_CSUM
;
422 static int iov_fill(struct iovec
*iov
, int iovcnt
, const void *buf
, int count
)
427 while (offset
< count
&& i
< iovcnt
) {
428 int len
= MIN(iov
[i
].iov_len
, count
- offset
);
429 memcpy(iov
[i
].iov_base
, buf
+ offset
, len
);
437 static int receive_header(VirtIONet
*n
, struct iovec
*iov
, int iovcnt
,
438 const void *buf
, size_t size
, size_t hdr_len
)
440 struct virtio_net_hdr
*hdr
= (struct virtio_net_hdr
*)iov
[0].iov_base
;
444 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
446 if (n
->has_vnet_hdr
) {
447 memcpy(hdr
, buf
, sizeof(*hdr
));
448 offset
= sizeof(*hdr
);
449 work_around_broken_dhclient(hdr
, buf
+ offset
, size
- offset
);
452 /* We only ever receive a struct virtio_net_hdr from the tapfd,
453 * but we may be passing along a larger header to the guest.
455 iov
[0].iov_base
+= hdr_len
;
456 iov
[0].iov_len
-= hdr_len
;
461 static int receive_filter(VirtIONet
*n
, const uint8_t *buf
, int size
)
463 static const uint8_t bcast
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
464 static const uint8_t vlan
[] = {0x81, 0x00};
465 uint8_t *ptr
= (uint8_t *)buf
;
471 if (n
->has_vnet_hdr
) {
472 ptr
+= sizeof(struct virtio_net_hdr
);
475 if (!memcmp(&ptr
[12], vlan
, sizeof(vlan
))) {
476 int vid
= be16_to_cpup((uint16_t *)(ptr
+ 14)) & 0xfff;
477 if (!(n
->vlans
[vid
>> 5] & (1U << (vid
& 0x1f))))
481 if (ptr
[0] & 1) { // multicast
482 if (!memcmp(ptr
, bcast
, sizeof(bcast
))) {
484 } else if (n
->nomulti
) {
486 } else if (n
->allmulti
|| n
->mac_table
.multi_overflow
) {
490 for (i
= n
->mac_table
.first_multi
; i
< n
->mac_table
.in_use
; i
++) {
491 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
498 } else if (n
->alluni
|| n
->mac_table
.uni_overflow
) {
500 } else if (!memcmp(ptr
, n
->mac
, ETH_ALEN
)) {
504 for (i
= 0; i
< n
->mac_table
.first_multi
; i
++) {
505 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
514 static ssize_t
virtio_net_receive(VLANClientState
*vc
, const uint8_t *buf
, size_t size
)
516 VirtIONet
*n
= vc
->opaque
;
517 struct virtio_net_hdr_mrg_rxbuf
*mhdr
= NULL
;
518 size_t hdr_len
, offset
, i
;
520 if (!do_virtio_net_can_receive(n
, size
))
523 if (!receive_filter(n
, buf
, size
))
526 /* hdr_len refers to the header we supply to the guest */
527 hdr_len
= n
->mergeable_rx_bufs
?
528 sizeof(struct virtio_net_hdr_mrg_rxbuf
) : sizeof(struct virtio_net_hdr
);
532 while (offset
< size
) {
533 VirtQueueElement elem
;
535 struct iovec sg
[VIRTQUEUE_MAX_SIZE
];
539 if ((i
!= 0 && !n
->mergeable_rx_bufs
) ||
540 virtqueue_pop(n
->rx_vq
, &elem
) == 0) {
543 fprintf(stderr
, "virtio-net truncating packet\n");
547 if (elem
.in_num
< 1) {
548 fprintf(stderr
, "virtio-net receive queue contains no in buffers\n");
552 if (!n
->mergeable_rx_bufs
&& elem
.in_sg
[0].iov_len
!= hdr_len
) {
553 fprintf(stderr
, "virtio-net header not in first element\n");
557 memcpy(&sg
, &elem
.in_sg
[0], sizeof(sg
[0]) * elem
.in_num
);
560 if (n
->mergeable_rx_bufs
)
561 mhdr
= (struct virtio_net_hdr_mrg_rxbuf
*)sg
[0].iov_base
;
563 offset
+= receive_header(n
, sg
, elem
.in_num
,
564 buf
+ offset
, size
- offset
, hdr_len
);
568 /* copy in packet. ugh */
569 len
= iov_fill(sg
, elem
.in_num
,
570 buf
+ offset
, size
- offset
);
573 /* signal other side */
574 virtqueue_fill(n
->rx_vq
, &elem
, total
, i
++);
580 mhdr
->num_buffers
= i
;
582 virtqueue_flush(n
->rx_vq
, i
);
583 virtio_notify(&n
->vdev
, n
->rx_vq
);
588 static void virtio_net_flush_tx(VirtIONet
*n
, VirtQueue
*vq
);
590 static void virtio_net_tx_complete(VLANClientState
*vc
, ssize_t len
)
592 VirtIONet
*n
= vc
->opaque
;
594 virtqueue_push(n
->tx_vq
, &n
->async_tx
.elem
, n
->async_tx
.len
);
595 virtio_notify(&n
->vdev
, n
->tx_vq
);
597 n
->async_tx
.elem
.out_num
= n
->async_tx
.len
= 0;
599 virtio_queue_set_notification(n
->tx_vq
, 1);
600 virtio_net_flush_tx(n
, n
->tx_vq
);
604 static void virtio_net_flush_tx(VirtIONet
*n
, VirtQueue
*vq
)
606 VirtQueueElement elem
;
608 if (!(n
->vdev
.status
& VIRTIO_CONFIG_S_DRIVER_OK
))
611 if (n
->async_tx
.elem
.out_num
) {
612 virtio_queue_set_notification(n
->tx_vq
, 0);
616 while (virtqueue_pop(vq
, &elem
)) {
617 ssize_t ret
, len
= 0;
618 unsigned int out_num
= elem
.out_num
;
619 struct iovec
*out_sg
= &elem
.out_sg
[0];
622 /* hdr_len refers to the header received from the guest */
623 hdr_len
= n
->mergeable_rx_bufs
?
624 sizeof(struct virtio_net_hdr_mrg_rxbuf
) :
625 sizeof(struct virtio_net_hdr
);
627 if (out_num
< 1 || out_sg
->iov_len
!= hdr_len
) {
628 fprintf(stderr
, "virtio-net header not in first element\n");
632 /* ignore the header if GSO is not supported */
633 if (!n
->has_vnet_hdr
) {
637 } else if (n
->mergeable_rx_bufs
) {
638 /* tapfd expects a struct virtio_net_hdr */
639 hdr_len
-= sizeof(struct virtio_net_hdr
);
640 out_sg
->iov_len
-= hdr_len
;
644 ret
= qemu_sendv_packet_async(n
->vc
, out_sg
, out_num
,
645 virtio_net_tx_complete
);
647 virtio_queue_set_notification(n
->tx_vq
, 0);
648 n
->async_tx
.elem
= elem
;
649 n
->async_tx
.len
= len
;
655 virtqueue_push(vq
, &elem
, len
);
656 virtio_notify(&n
->vdev
, vq
);
660 static void virtio_net_handle_tx(VirtIODevice
*vdev
, VirtQueue
*vq
)
662 VirtIONet
*n
= to_virtio_net(vdev
);
664 if (n
->tx_timer_active
) {
665 virtio_queue_set_notification(vq
, 1);
666 qemu_del_timer(n
->tx_timer
);
667 n
->tx_timer_active
= 0;
668 virtio_net_flush_tx(n
, vq
);
670 qemu_mod_timer(n
->tx_timer
,
671 qemu_get_clock(vm_clock
) + TX_TIMER_INTERVAL
);
672 n
->tx_timer_active
= 1;
673 virtio_queue_set_notification(vq
, 0);
677 static void virtio_net_tx_timer(void *opaque
)
679 VirtIONet
*n
= opaque
;
681 n
->tx_timer_active
= 0;
683 /* Just in case the driver is not ready on more */
684 if (!(n
->vdev
.status
& VIRTIO_CONFIG_S_DRIVER_OK
))
687 virtio_queue_set_notification(n
->tx_vq
, 1);
688 virtio_net_flush_tx(n
, n
->tx_vq
);
691 static void virtio_net_save(QEMUFile
*f
, void *opaque
)
693 VirtIONet
*n
= opaque
;
695 virtio_save(&n
->vdev
, f
);
697 qemu_put_buffer(f
, n
->mac
, ETH_ALEN
);
698 qemu_put_be32(f
, n
->tx_timer_active
);
699 qemu_put_be32(f
, n
->mergeable_rx_bufs
);
700 qemu_put_be16(f
, n
->status
);
701 qemu_put_byte(f
, n
->promisc
);
702 qemu_put_byte(f
, n
->allmulti
);
703 qemu_put_be32(f
, n
->mac_table
.in_use
);
704 qemu_put_buffer(f
, n
->mac_table
.macs
, n
->mac_table
.in_use
* ETH_ALEN
);
705 qemu_put_buffer(f
, (uint8_t *)n
->vlans
, MAX_VLAN
>> 3);
706 qemu_put_be32(f
, n
->has_vnet_hdr
);
707 qemu_put_byte(f
, n
->mac_table
.multi_overflow
);
708 qemu_put_byte(f
, n
->mac_table
.uni_overflow
);
709 qemu_put_byte(f
, n
->alluni
);
710 qemu_put_byte(f
, n
->nomulti
);
711 qemu_put_byte(f
, n
->nouni
);
712 qemu_put_byte(f
, n
->nobcast
);
713 qemu_put_byte(f
, n
->has_ufo
);
716 static int virtio_net_load(QEMUFile
*f
, void *opaque
, int version_id
)
718 VirtIONet
*n
= opaque
;
721 if (version_id
< 2 || version_id
> VIRTIO_NET_VM_VERSION
)
724 virtio_load(&n
->vdev
, f
);
726 qemu_get_buffer(f
, n
->mac
, ETH_ALEN
);
727 n
->tx_timer_active
= qemu_get_be32(f
);
728 n
->mergeable_rx_bufs
= qemu_get_be32(f
);
731 n
->status
= qemu_get_be16(f
);
733 if (version_id
>= 4) {
734 if (version_id
< 8) {
735 n
->promisc
= qemu_get_be32(f
);
736 n
->allmulti
= qemu_get_be32(f
);
738 n
->promisc
= qemu_get_byte(f
);
739 n
->allmulti
= qemu_get_byte(f
);
743 if (version_id
>= 5) {
744 n
->mac_table
.in_use
= qemu_get_be32(f
);
745 /* MAC_TABLE_ENTRIES may be different from the saved image */
746 if (n
->mac_table
.in_use
<= MAC_TABLE_ENTRIES
) {
747 qemu_get_buffer(f
, n
->mac_table
.macs
,
748 n
->mac_table
.in_use
* ETH_ALEN
);
749 } else if (n
->mac_table
.in_use
) {
750 qemu_fseek(f
, n
->mac_table
.in_use
* ETH_ALEN
, SEEK_CUR
);
751 n
->mac_table
.multi_overflow
= n
->mac_table
.uni_overflow
= 1;
752 n
->mac_table
.in_use
= 0;
757 qemu_get_buffer(f
, (uint8_t *)n
->vlans
, MAX_VLAN
>> 3);
759 if (version_id
>= 7) {
760 if (qemu_get_be32(f
) && !peer_has_vnet_hdr(n
)) {
761 qemu_error("virtio-net: saved image requires vnet_hdr=on\n");
765 if (n
->has_vnet_hdr
) {
766 tap_using_vnet_hdr(n
->vc
->peer
, 1);
767 tap_set_offload(n
->vc
->peer
,
768 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_CSUM
) & 1,
769 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_TSO4
) & 1,
770 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_TSO6
) & 1,
771 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_ECN
) & 1,
772 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_UFO
) & 1);
776 if (version_id
>= 9) {
777 n
->mac_table
.multi_overflow
= qemu_get_byte(f
);
778 n
->mac_table
.uni_overflow
= qemu_get_byte(f
);
781 if (version_id
>= 10) {
782 n
->alluni
= qemu_get_byte(f
);
783 n
->nomulti
= qemu_get_byte(f
);
784 n
->nouni
= qemu_get_byte(f
);
785 n
->nobcast
= qemu_get_byte(f
);
788 if (version_id
>= 11) {
789 if (qemu_get_byte(f
) && !peer_has_ufo(n
)) {
790 qemu_error("virtio-net: saved image requires TUN_F_UFO support\n");
795 /* Find the first multicast entry in the saved MAC filter */
796 for (i
= 0; i
< n
->mac_table
.in_use
; i
++) {
797 if (n
->mac_table
.macs
[i
* ETH_ALEN
] & 1) {
801 n
->mac_table
.first_multi
= i
;
803 if (n
->tx_timer_active
) {
804 qemu_mod_timer(n
->tx_timer
,
805 qemu_get_clock(vm_clock
) + TX_TIMER_INTERVAL
);
811 static void virtio_net_cleanup(VLANClientState
*vc
)
813 VirtIONet
*n
= vc
->opaque
;
818 VirtIODevice
*virtio_net_init(DeviceState
*dev
, NICConf
*conf
)
821 static int virtio_net_id
;
823 n
= (VirtIONet
*)virtio_common_init("virtio-net", VIRTIO_ID_NET
,
824 sizeof(struct virtio_net_config
),
827 n
->vdev
.get_config
= virtio_net_get_config
;
828 n
->vdev
.set_config
= virtio_net_set_config
;
829 n
->vdev
.get_features
= virtio_net_get_features
;
830 n
->vdev
.set_features
= virtio_net_set_features
;
831 n
->vdev
.bad_features
= virtio_net_bad_features
;
832 n
->vdev
.reset
= virtio_net_reset
;
833 n
->rx_vq
= virtio_add_queue(&n
->vdev
, 256, virtio_net_handle_rx
);
834 n
->tx_vq
= virtio_add_queue(&n
->vdev
, 256, virtio_net_handle_tx
);
835 n
->ctrl_vq
= virtio_add_queue(&n
->vdev
, 64, virtio_net_handle_ctrl
);
836 qemu_macaddr_default_if_unset(&conf
->macaddr
);
837 n
->status
= VIRTIO_NET_S_LINK_UP
;
838 n
->vc
= qemu_new_vlan_client(NET_CLIENT_TYPE_NIC
, conf
->vlan
, conf
->peer
,
839 dev
->info
->name
, dev
->id
,
840 virtio_net_can_receive
,
841 virtio_net_receive
, NULL
, NULL
,
842 virtio_net_cleanup
, n
);
843 n
->vc
->link_status_changed
= virtio_net_set_link_status
;
845 qemu_format_nic_info_str(n
->vc
, conf
->macaddr
.a
);
847 n
->tx_timer
= qemu_new_timer(vm_clock
, virtio_net_tx_timer
, n
);
848 n
->tx_timer_active
= 0;
849 n
->mergeable_rx_bufs
= 0;
850 n
->promisc
= 1; /* for compatibility */
852 n
->mac_table
.macs
= qemu_mallocz(MAC_TABLE_ENTRIES
* ETH_ALEN
);
854 n
->vlans
= qemu_mallocz(MAX_VLAN
>> 3);
856 register_savevm("virtio-net", virtio_net_id
++, VIRTIO_NET_VM_VERSION
,
857 virtio_net_save
, virtio_net_load
, n
);
862 void virtio_net_exit(VirtIODevice
*vdev
)
864 VirtIONet
*n
= DO_UPCAST(VirtIONet
, vdev
, vdev
);
866 qemu_purge_queued_packets(n
->vc
);
868 unregister_savevm("virtio-net", n
);
870 qemu_free(n
->mac_table
.macs
);
873 qemu_del_timer(n
->tx_timer
);
874 qemu_free_timer(n
->tx_timer
);
876 virtio_cleanup(&n
->vdev
);
877 qemu_del_vlan_client(n
->vc
);