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 "qemu-timer.h"
17 #include "virtio-net.h"
19 #define VIRTIO_NET_VM_VERSION 11
21 #define MAC_TABLE_ENTRIES 64
22 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
24 typedef struct VirtIONet
27 uint8_t mac
[ETH_ALEN
];
35 uint32_t has_vnet_hdr
;
38 VirtQueueElement elem
;
41 int mergeable_rx_bufs
;
51 uint8_t multi_overflow
;
59 * - we could suppress RX interrupt if we were so inclined.
62 static VirtIONet
*to_virtio_net(VirtIODevice
*vdev
)
64 return (VirtIONet
*)vdev
;
67 static void virtio_net_get_config(VirtIODevice
*vdev
, uint8_t *config
)
69 VirtIONet
*n
= to_virtio_net(vdev
);
70 struct virtio_net_config netcfg
;
72 netcfg
.status
= n
->status
;
73 memcpy(netcfg
.mac
, n
->mac
, ETH_ALEN
);
74 memcpy(config
, &netcfg
, sizeof(netcfg
));
77 static void virtio_net_set_config(VirtIODevice
*vdev
, const uint8_t *config
)
79 VirtIONet
*n
= to_virtio_net(vdev
);
80 struct virtio_net_config netcfg
;
82 memcpy(&netcfg
, config
, sizeof(netcfg
));
84 if (memcmp(netcfg
.mac
, n
->mac
, ETH_ALEN
)) {
85 memcpy(n
->mac
, netcfg
.mac
, ETH_ALEN
);
86 qemu_format_nic_info_str(n
->vc
, n
->mac
);
90 static void virtio_net_set_link_status(VLANClientState
*vc
)
92 VirtIONet
*n
= vc
->opaque
;
93 uint16_t old_status
= n
->status
;
96 n
->status
&= ~VIRTIO_NET_S_LINK_UP
;
98 n
->status
|= VIRTIO_NET_S_LINK_UP
;
100 if (n
->status
!= old_status
)
101 virtio_notify_config(&n
->vdev
);
104 static void virtio_net_reset(VirtIODevice
*vdev
)
106 VirtIONet
*n
= to_virtio_net(vdev
);
108 /* Reset back to compatibility mode */
116 /* Flush any MAC and VLAN filter table state */
117 n
->mac_table
.in_use
= 0;
118 n
->mac_table
.first_multi
= 0;
119 n
->mac_table
.multi_overflow
= 0;
120 n
->mac_table
.uni_overflow
= 0;
121 memset(n
->mac_table
.macs
, 0, MAC_TABLE_ENTRIES
* ETH_ALEN
);
122 memset(n
->vlans
, 0, MAX_VLAN
>> 3);
125 static int peer_has_vnet_hdr(VirtIONet
*n
)
130 if (n
->vc
->peer
->type
!= NET_CLIENT_TYPE_TAP
)
133 n
->has_vnet_hdr
= tap_has_vnet_hdr(n
->vc
->peer
);
135 return n
->has_vnet_hdr
;
138 static int peer_has_ufo(VirtIONet
*n
)
140 if (!peer_has_vnet_hdr(n
))
143 n
->has_ufo
= tap_has_ufo(n
->vc
->peer
);
148 static uint32_t virtio_net_get_features(VirtIODevice
*vdev
)
150 VirtIONet
*n
= to_virtio_net(vdev
);
151 uint32_t features
= (1 << VIRTIO_NET_F_MAC
) |
152 (1 << VIRTIO_NET_F_MRG_RXBUF
) |
153 (1 << VIRTIO_NET_F_STATUS
) |
154 (1 << VIRTIO_NET_F_CTRL_VQ
) |
155 (1 << VIRTIO_NET_F_CTRL_RX
) |
156 (1 << VIRTIO_NET_F_CTRL_VLAN
) |
157 (1 << VIRTIO_NET_F_CTRL_RX_EXTRA
);
159 if (peer_has_vnet_hdr(n
)) {
160 tap_using_vnet_hdr(n
->vc
->peer
, 1);
162 features
|= (1 << VIRTIO_NET_F_CSUM
);
163 features
|= (1 << VIRTIO_NET_F_HOST_TSO4
);
164 features
|= (1 << VIRTIO_NET_F_HOST_TSO6
);
165 features
|= (1 << VIRTIO_NET_F_HOST_ECN
);
167 features
|= (1 << VIRTIO_NET_F_GUEST_CSUM
);
168 features
|= (1 << VIRTIO_NET_F_GUEST_TSO4
);
169 features
|= (1 << VIRTIO_NET_F_GUEST_TSO6
);
170 features
|= (1 << VIRTIO_NET_F_GUEST_ECN
);
172 if (peer_has_ufo(n
)) {
173 features
|= (1 << VIRTIO_NET_F_GUEST_UFO
);
174 features
|= (1 << VIRTIO_NET_F_HOST_UFO
);
181 static uint32_t virtio_net_bad_features(VirtIODevice
*vdev
)
183 uint32_t features
= 0;
185 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
187 features
|= (1 << VIRTIO_NET_F_MAC
);
188 features
|= (1 << VIRTIO_NET_F_GUEST_CSUM
);
189 features
|= (1 << VIRTIO_NET_F_GUEST_TSO4
);
190 features
|= (1 << VIRTIO_NET_F_GUEST_TSO6
);
191 features
|= (1 << VIRTIO_NET_F_GUEST_ECN
);
193 return features
& virtio_net_get_features(vdev
);
196 static void virtio_net_set_features(VirtIODevice
*vdev
, uint32_t features
)
198 VirtIONet
*n
= to_virtio_net(vdev
);
200 n
->mergeable_rx_bufs
= !!(features
& (1 << VIRTIO_NET_F_MRG_RXBUF
));
202 if (n
->has_vnet_hdr
) {
203 tap_set_offload(n
->vc
->peer
,
204 (features
>> VIRTIO_NET_F_GUEST_CSUM
) & 1,
205 (features
>> VIRTIO_NET_F_GUEST_TSO4
) & 1,
206 (features
>> VIRTIO_NET_F_GUEST_TSO6
) & 1,
207 (features
>> VIRTIO_NET_F_GUEST_ECN
) & 1,
208 (features
>> VIRTIO_NET_F_GUEST_UFO
) & 1);
212 static int virtio_net_handle_rx_mode(VirtIONet
*n
, uint8_t cmd
,
213 VirtQueueElement
*elem
)
217 if (elem
->out_num
!= 2 || elem
->out_sg
[1].iov_len
!= sizeof(on
)) {
218 fprintf(stderr
, "virtio-net ctrl invalid rx mode command\n");
222 on
= ldub_p(elem
->out_sg
[1].iov_base
);
224 if (cmd
== VIRTIO_NET_CTRL_RX_MODE_PROMISC
)
226 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_ALLMULTI
)
228 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_ALLUNI
)
230 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_NOMULTI
)
232 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_NOUNI
)
234 else if (cmd
== VIRTIO_NET_CTRL_RX_MODE_NOBCAST
)
237 return VIRTIO_NET_ERR
;
239 return VIRTIO_NET_OK
;
242 static int virtio_net_handle_mac(VirtIONet
*n
, uint8_t cmd
,
243 VirtQueueElement
*elem
)
245 struct virtio_net_ctrl_mac mac_data
;
247 if (cmd
!= VIRTIO_NET_CTRL_MAC_TABLE_SET
|| elem
->out_num
!= 3 ||
248 elem
->out_sg
[1].iov_len
< sizeof(mac_data
) ||
249 elem
->out_sg
[2].iov_len
< sizeof(mac_data
))
250 return VIRTIO_NET_ERR
;
252 n
->mac_table
.in_use
= 0;
253 n
->mac_table
.first_multi
= 0;
254 n
->mac_table
.uni_overflow
= 0;
255 n
->mac_table
.multi_overflow
= 0;
256 memset(n
->mac_table
.macs
, 0, MAC_TABLE_ENTRIES
* ETH_ALEN
);
258 mac_data
.entries
= ldl_le_p(elem
->out_sg
[1].iov_base
);
260 if (sizeof(mac_data
.entries
) +
261 (mac_data
.entries
* ETH_ALEN
) > elem
->out_sg
[1].iov_len
)
262 return VIRTIO_NET_ERR
;
264 if (mac_data
.entries
<= MAC_TABLE_ENTRIES
) {
265 memcpy(n
->mac_table
.macs
, elem
->out_sg
[1].iov_base
+ sizeof(mac_data
),
266 mac_data
.entries
* ETH_ALEN
);
267 n
->mac_table
.in_use
+= mac_data
.entries
;
269 n
->mac_table
.uni_overflow
= 1;
272 n
->mac_table
.first_multi
= n
->mac_table
.in_use
;
274 mac_data
.entries
= ldl_le_p(elem
->out_sg
[2].iov_base
);
276 if (sizeof(mac_data
.entries
) +
277 (mac_data
.entries
* ETH_ALEN
) > elem
->out_sg
[2].iov_len
)
278 return VIRTIO_NET_ERR
;
280 if (mac_data
.entries
) {
281 if (n
->mac_table
.in_use
+ mac_data
.entries
<= MAC_TABLE_ENTRIES
) {
282 memcpy(n
->mac_table
.macs
+ (n
->mac_table
.in_use
* ETH_ALEN
),
283 elem
->out_sg
[2].iov_base
+ sizeof(mac_data
),
284 mac_data
.entries
* ETH_ALEN
);
285 n
->mac_table
.in_use
+= mac_data
.entries
;
287 n
->mac_table
.multi_overflow
= 1;
291 return VIRTIO_NET_OK
;
294 static int virtio_net_handle_vlan_table(VirtIONet
*n
, uint8_t cmd
,
295 VirtQueueElement
*elem
)
299 if (elem
->out_num
!= 2 || elem
->out_sg
[1].iov_len
!= sizeof(vid
)) {
300 fprintf(stderr
, "virtio-net ctrl invalid vlan command\n");
301 return VIRTIO_NET_ERR
;
304 vid
= lduw_le_p(elem
->out_sg
[1].iov_base
);
307 return VIRTIO_NET_ERR
;
309 if (cmd
== VIRTIO_NET_CTRL_VLAN_ADD
)
310 n
->vlans
[vid
>> 5] |= (1U << (vid
& 0x1f));
311 else if (cmd
== VIRTIO_NET_CTRL_VLAN_DEL
)
312 n
->vlans
[vid
>> 5] &= ~(1U << (vid
& 0x1f));
314 return VIRTIO_NET_ERR
;
316 return VIRTIO_NET_OK
;
319 static void virtio_net_handle_ctrl(VirtIODevice
*vdev
, VirtQueue
*vq
)
321 VirtIONet
*n
= to_virtio_net(vdev
);
322 struct virtio_net_ctrl_hdr ctrl
;
323 virtio_net_ctrl_ack status
= VIRTIO_NET_ERR
;
324 VirtQueueElement elem
;
326 while (virtqueue_pop(vq
, &elem
)) {
327 if ((elem
.in_num
< 1) || (elem
.out_num
< 1)) {
328 fprintf(stderr
, "virtio-net ctrl missing headers\n");
332 if (elem
.out_sg
[0].iov_len
< sizeof(ctrl
) ||
333 elem
.in_sg
[elem
.in_num
- 1].iov_len
< sizeof(status
)) {
334 fprintf(stderr
, "virtio-net ctrl header not in correct element\n");
338 ctrl
.class = ldub_p(elem
.out_sg
[0].iov_base
);
339 ctrl
.cmd
= ldub_p(elem
.out_sg
[0].iov_base
+ sizeof(ctrl
.class));
341 if (ctrl
.class == VIRTIO_NET_CTRL_RX_MODE
)
342 status
= virtio_net_handle_rx_mode(n
, ctrl
.cmd
, &elem
);
343 else if (ctrl
.class == VIRTIO_NET_CTRL_MAC
)
344 status
= virtio_net_handle_mac(n
, ctrl
.cmd
, &elem
);
345 else if (ctrl
.class == VIRTIO_NET_CTRL_VLAN
)
346 status
= virtio_net_handle_vlan_table(n
, ctrl
.cmd
, &elem
);
348 stb_p(elem
.in_sg
[elem
.in_num
- 1].iov_base
, status
);
350 virtqueue_push(vq
, &elem
, sizeof(status
));
351 virtio_notify(vdev
, vq
);
357 static void virtio_net_handle_rx(VirtIODevice
*vdev
, VirtQueue
*vq
)
359 VirtIONet
*n
= to_virtio_net(vdev
);
361 qemu_flush_queued_packets(n
->vc
);
363 /* We now have RX buffers, signal to the IO thread to break out of the
364 * select to re-poll the tap file descriptor */
368 static int do_virtio_net_can_receive(VirtIONet
*n
, int bufsize
)
370 if (!virtio_queue_ready(n
->rx_vq
) ||
371 !(n
->vdev
.status
& VIRTIO_CONFIG_S_DRIVER_OK
))
374 if (virtio_queue_empty(n
->rx_vq
) ||
375 (n
->mergeable_rx_bufs
&&
376 !virtqueue_avail_bytes(n
->rx_vq
, bufsize
, 0))) {
377 virtio_queue_set_notification(n
->rx_vq
, 1);
381 virtio_queue_set_notification(n
->rx_vq
, 0);
385 static int virtio_net_can_receive(VLANClientState
*vc
)
387 VirtIONet
*n
= vc
->opaque
;
389 return do_virtio_net_can_receive(n
, VIRTIO_NET_MAX_BUFSIZE
);
392 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
393 * it never finds out that the packets don't have valid checksums. This
394 * causes dhclient to get upset. Fedora's carried a patch for ages to
395 * fix this with Xen but it hasn't appeared in an upstream release of
398 * To avoid breaking existing guests, we catch udp packets and add
399 * checksums. This is terrible but it's better than hacking the guest
402 * N.B. if we introduce a zero-copy API, this operation is no longer free so
403 * we should provide a mechanism to disable it to avoid polluting the host
406 static void work_around_broken_dhclient(struct virtio_net_hdr
*hdr
,
407 const uint8_t *buf
, size_t size
)
409 if ((hdr
->flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) && /* missing csum */
410 (size
> 27 && size
< 1500) && /* normal sized MTU */
411 (buf
[12] == 0x08 && buf
[13] == 0x00) && /* ethertype == IPv4 */
412 (buf
[23] == 17) && /* ip.protocol == UDP */
413 (buf
[34] == 0 && buf
[35] == 67)) { /* udp.srcport == bootps */
414 /* FIXME this cast is evil */
415 net_checksum_calculate((uint8_t *)buf
, size
);
416 hdr
->flags
&= ~VIRTIO_NET_HDR_F_NEEDS_CSUM
;
420 static int iov_fill(struct iovec
*iov
, int iovcnt
, const void *buf
, int count
)
425 while (offset
< count
&& i
< iovcnt
) {
426 int len
= MIN(iov
[i
].iov_len
, count
- offset
);
427 memcpy(iov
[i
].iov_base
, buf
+ offset
, len
);
435 static int receive_header(VirtIONet
*n
, struct iovec
*iov
, int iovcnt
,
436 const void *buf
, size_t size
, size_t hdr_len
)
438 struct virtio_net_hdr
*hdr
= (struct virtio_net_hdr
*)iov
[0].iov_base
;
442 hdr
->gso_type
= VIRTIO_NET_HDR_GSO_NONE
;
444 if (n
->has_vnet_hdr
) {
445 memcpy(hdr
, buf
, sizeof(*hdr
));
446 offset
= sizeof(*hdr
);
447 work_around_broken_dhclient(hdr
, buf
+ offset
, size
- offset
);
450 /* We only ever receive a struct virtio_net_hdr from the tapfd,
451 * but we may be passing along a larger header to the guest.
453 iov
[0].iov_base
+= hdr_len
;
454 iov
[0].iov_len
-= hdr_len
;
459 static int receive_filter(VirtIONet
*n
, const uint8_t *buf
, int size
)
461 static const uint8_t bcast
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
462 static const uint8_t vlan
[] = {0x81, 0x00};
463 uint8_t *ptr
= (uint8_t *)buf
;
469 if (n
->has_vnet_hdr
) {
470 ptr
+= sizeof(struct virtio_net_hdr
);
473 if (!memcmp(&ptr
[12], vlan
, sizeof(vlan
))) {
474 int vid
= be16_to_cpup((uint16_t *)(ptr
+ 14)) & 0xfff;
475 if (!(n
->vlans
[vid
>> 5] & (1U << (vid
& 0x1f))))
479 if (ptr
[0] & 1) { // multicast
480 if (!memcmp(ptr
, bcast
, sizeof(bcast
))) {
482 } else if (n
->nomulti
) {
484 } else if (n
->allmulti
|| n
->mac_table
.multi_overflow
) {
488 for (i
= n
->mac_table
.first_multi
; i
< n
->mac_table
.in_use
; i
++) {
489 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
496 } else if (n
->alluni
|| n
->mac_table
.uni_overflow
) {
498 } else if (!memcmp(ptr
, n
->mac
, ETH_ALEN
)) {
502 for (i
= 0; i
< n
->mac_table
.first_multi
; i
++) {
503 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
512 static ssize_t
virtio_net_receive(VLANClientState
*vc
, const uint8_t *buf
, size_t size
)
514 VirtIONet
*n
= vc
->opaque
;
515 struct virtio_net_hdr_mrg_rxbuf
*mhdr
= NULL
;
516 size_t hdr_len
, offset
, i
;
518 if (!do_virtio_net_can_receive(n
, size
))
521 if (!receive_filter(n
, buf
, size
))
524 /* hdr_len refers to the header we supply to the guest */
525 hdr_len
= n
->mergeable_rx_bufs
?
526 sizeof(struct virtio_net_hdr_mrg_rxbuf
) : sizeof(struct virtio_net_hdr
);
530 while (offset
< size
) {
531 VirtQueueElement elem
;
533 struct iovec sg
[VIRTQUEUE_MAX_SIZE
];
537 if ((i
!= 0 && !n
->mergeable_rx_bufs
) ||
538 virtqueue_pop(n
->rx_vq
, &elem
) == 0) {
541 fprintf(stderr
, "virtio-net truncating packet\n");
545 if (elem
.in_num
< 1) {
546 fprintf(stderr
, "virtio-net receive queue contains no in buffers\n");
550 if (!n
->mergeable_rx_bufs
&& elem
.in_sg
[0].iov_len
!= hdr_len
) {
551 fprintf(stderr
, "virtio-net header not in first element\n");
555 memcpy(&sg
, &elem
.in_sg
[0], sizeof(sg
[0]) * elem
.in_num
);
558 if (n
->mergeable_rx_bufs
)
559 mhdr
= (struct virtio_net_hdr_mrg_rxbuf
*)sg
[0].iov_base
;
561 offset
+= receive_header(n
, sg
, elem
.in_num
,
562 buf
+ offset
, size
- offset
, hdr_len
);
566 /* copy in packet. ugh */
567 len
= iov_fill(sg
, elem
.in_num
,
568 buf
+ offset
, size
- offset
);
571 /* signal other side */
572 virtqueue_fill(n
->rx_vq
, &elem
, total
, i
++);
578 mhdr
->num_buffers
= i
;
580 virtqueue_flush(n
->rx_vq
, i
);
581 virtio_notify(&n
->vdev
, n
->rx_vq
);
586 static void virtio_net_flush_tx(VirtIONet
*n
, VirtQueue
*vq
);
588 static void virtio_net_tx_complete(VLANClientState
*vc
, ssize_t len
)
590 VirtIONet
*n
= vc
->opaque
;
592 virtqueue_push(n
->tx_vq
, &n
->async_tx
.elem
, n
->async_tx
.len
);
593 virtio_notify(&n
->vdev
, n
->tx_vq
);
595 n
->async_tx
.elem
.out_num
= n
->async_tx
.len
= 0;
597 virtio_queue_set_notification(n
->tx_vq
, 1);
598 virtio_net_flush_tx(n
, n
->tx_vq
);
602 static void virtio_net_flush_tx(VirtIONet
*n
, VirtQueue
*vq
)
604 VirtQueueElement elem
;
606 if (!(n
->vdev
.status
& VIRTIO_CONFIG_S_DRIVER_OK
))
609 if (n
->async_tx
.elem
.out_num
) {
610 virtio_queue_set_notification(n
->tx_vq
, 0);
614 while (virtqueue_pop(vq
, &elem
)) {
615 ssize_t ret
, len
= 0;
616 unsigned int out_num
= elem
.out_num
;
617 struct iovec
*out_sg
= &elem
.out_sg
[0];
620 /* hdr_len refers to the header received from the guest */
621 hdr_len
= n
->mergeable_rx_bufs
?
622 sizeof(struct virtio_net_hdr_mrg_rxbuf
) :
623 sizeof(struct virtio_net_hdr
);
625 if (out_num
< 1 || out_sg
->iov_len
!= hdr_len
) {
626 fprintf(stderr
, "virtio-net header not in first element\n");
630 /* ignore the header if GSO is not supported */
631 if (!n
->has_vnet_hdr
) {
635 } else if (n
->mergeable_rx_bufs
) {
636 /* tapfd expects a struct virtio_net_hdr */
637 hdr_len
-= sizeof(struct virtio_net_hdr
);
638 out_sg
->iov_len
-= hdr_len
;
642 ret
= qemu_sendv_packet_async(n
->vc
, out_sg
, out_num
,
643 virtio_net_tx_complete
);
645 virtio_queue_set_notification(n
->tx_vq
, 0);
646 n
->async_tx
.elem
= elem
;
647 n
->async_tx
.len
= len
;
653 virtqueue_push(vq
, &elem
, len
);
654 virtio_notify(&n
->vdev
, vq
);
658 static void virtio_net_handle_tx(VirtIODevice
*vdev
, VirtQueue
*vq
)
660 VirtIONet
*n
= to_virtio_net(vdev
);
662 if (n
->tx_timer_active
) {
663 virtio_queue_set_notification(vq
, 1);
664 qemu_del_timer(n
->tx_timer
);
665 n
->tx_timer_active
= 0;
666 virtio_net_flush_tx(n
, vq
);
668 qemu_mod_timer(n
->tx_timer
,
669 qemu_get_clock(vm_clock
) + TX_TIMER_INTERVAL
);
670 n
->tx_timer_active
= 1;
671 virtio_queue_set_notification(vq
, 0);
675 static void virtio_net_tx_timer(void *opaque
)
677 VirtIONet
*n
= opaque
;
679 n
->tx_timer_active
= 0;
681 /* Just in case the driver is not ready on more */
682 if (!(n
->vdev
.status
& VIRTIO_CONFIG_S_DRIVER_OK
))
685 virtio_queue_set_notification(n
->tx_vq
, 1);
686 virtio_net_flush_tx(n
, n
->tx_vq
);
689 static void virtio_net_save(QEMUFile
*f
, void *opaque
)
691 VirtIONet
*n
= opaque
;
693 virtio_save(&n
->vdev
, f
);
695 qemu_put_buffer(f
, n
->mac
, ETH_ALEN
);
696 qemu_put_be32(f
, n
->tx_timer_active
);
697 qemu_put_be32(f
, n
->mergeable_rx_bufs
);
698 qemu_put_be16(f
, n
->status
);
699 qemu_put_byte(f
, n
->promisc
);
700 qemu_put_byte(f
, n
->allmulti
);
701 qemu_put_be32(f
, n
->mac_table
.in_use
);
702 qemu_put_buffer(f
, n
->mac_table
.macs
, n
->mac_table
.in_use
* ETH_ALEN
);
703 qemu_put_buffer(f
, (uint8_t *)n
->vlans
, MAX_VLAN
>> 3);
704 qemu_put_be32(f
, n
->has_vnet_hdr
);
705 qemu_put_byte(f
, n
->mac_table
.multi_overflow
);
706 qemu_put_byte(f
, n
->mac_table
.uni_overflow
);
707 qemu_put_byte(f
, n
->alluni
);
708 qemu_put_byte(f
, n
->nomulti
);
709 qemu_put_byte(f
, n
->nouni
);
710 qemu_put_byte(f
, n
->nobcast
);
711 qemu_put_byte(f
, n
->has_ufo
);
714 static int virtio_net_load(QEMUFile
*f
, void *opaque
, int version_id
)
716 VirtIONet
*n
= opaque
;
719 if (version_id
< 2 || version_id
> VIRTIO_NET_VM_VERSION
)
722 virtio_load(&n
->vdev
, f
);
724 qemu_get_buffer(f
, n
->mac
, ETH_ALEN
);
725 n
->tx_timer_active
= qemu_get_be32(f
);
726 n
->mergeable_rx_bufs
= qemu_get_be32(f
);
729 n
->status
= qemu_get_be16(f
);
731 if (version_id
>= 4) {
732 if (version_id
< 8) {
733 n
->promisc
= qemu_get_be32(f
);
734 n
->allmulti
= qemu_get_be32(f
);
736 n
->promisc
= qemu_get_byte(f
);
737 n
->allmulti
= qemu_get_byte(f
);
741 if (version_id
>= 5) {
742 n
->mac_table
.in_use
= qemu_get_be32(f
);
743 /* MAC_TABLE_ENTRIES may be different from the saved image */
744 if (n
->mac_table
.in_use
<= MAC_TABLE_ENTRIES
) {
745 qemu_get_buffer(f
, n
->mac_table
.macs
,
746 n
->mac_table
.in_use
* ETH_ALEN
);
747 } else if (n
->mac_table
.in_use
) {
748 qemu_fseek(f
, n
->mac_table
.in_use
* ETH_ALEN
, SEEK_CUR
);
749 n
->mac_table
.multi_overflow
= n
->mac_table
.uni_overflow
= 1;
750 n
->mac_table
.in_use
= 0;
755 qemu_get_buffer(f
, (uint8_t *)n
->vlans
, MAX_VLAN
>> 3);
757 if (version_id
>= 7) {
758 if (qemu_get_be32(f
) && !peer_has_vnet_hdr(n
)) {
759 qemu_error("virtio-net: saved image requires vnet_hdr=on\n");
763 if (n
->has_vnet_hdr
) {
764 tap_using_vnet_hdr(n
->vc
->peer
, 1);
765 tap_set_offload(n
->vc
->peer
,
766 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_CSUM
) & 1,
767 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_TSO4
) & 1,
768 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_TSO6
) & 1,
769 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_ECN
) & 1,
770 (n
->vdev
.features
>> VIRTIO_NET_F_GUEST_UFO
) & 1);
774 if (version_id
>= 9) {
775 n
->mac_table
.multi_overflow
= qemu_get_byte(f
);
776 n
->mac_table
.uni_overflow
= qemu_get_byte(f
);
779 if (version_id
>= 10) {
780 n
->alluni
= qemu_get_byte(f
);
781 n
->nomulti
= qemu_get_byte(f
);
782 n
->nouni
= qemu_get_byte(f
);
783 n
->nobcast
= qemu_get_byte(f
);
786 if (version_id
>= 11) {
787 if (qemu_get_byte(f
) && !peer_has_ufo(n
)) {
788 qemu_error("virtio-net: saved image requires TUN_F_UFO support\n");
793 /* Find the first multicast entry in the saved MAC filter */
794 for (i
= 0; i
< n
->mac_table
.in_use
; i
++) {
795 if (n
->mac_table
.macs
[i
* ETH_ALEN
] & 1) {
799 n
->mac_table
.first_multi
= i
;
801 if (n
->tx_timer_active
) {
802 qemu_mod_timer(n
->tx_timer
,
803 qemu_get_clock(vm_clock
) + TX_TIMER_INTERVAL
);
809 static void virtio_net_cleanup(VLANClientState
*vc
)
811 VirtIONet
*n
= vc
->opaque
;
816 VirtIODevice
*virtio_net_init(DeviceState
*dev
, NICConf
*conf
)
819 static int virtio_net_id
;
821 n
= (VirtIONet
*)virtio_common_init("virtio-net", VIRTIO_ID_NET
,
822 sizeof(struct virtio_net_config
),
825 n
->vdev
.get_config
= virtio_net_get_config
;
826 n
->vdev
.set_config
= virtio_net_set_config
;
827 n
->vdev
.get_features
= virtio_net_get_features
;
828 n
->vdev
.set_features
= virtio_net_set_features
;
829 n
->vdev
.bad_features
= virtio_net_bad_features
;
830 n
->vdev
.reset
= virtio_net_reset
;
831 n
->rx_vq
= virtio_add_queue(&n
->vdev
, 256, virtio_net_handle_rx
);
832 n
->tx_vq
= virtio_add_queue(&n
->vdev
, 256, virtio_net_handle_tx
);
833 n
->ctrl_vq
= virtio_add_queue(&n
->vdev
, 64, virtio_net_handle_ctrl
);
834 qemu_macaddr_default_if_unset(&conf
->macaddr
);
835 n
->status
= VIRTIO_NET_S_LINK_UP
;
836 n
->vc
= qemu_new_vlan_client(NET_CLIENT_TYPE_NIC
, conf
->vlan
, conf
->peer
,
837 dev
->info
->name
, dev
->id
,
838 virtio_net_can_receive
,
839 virtio_net_receive
, NULL
, NULL
,
840 virtio_net_cleanup
, n
);
841 n
->vc
->link_status_changed
= virtio_net_set_link_status
;
843 qemu_format_nic_info_str(n
->vc
, conf
->macaddr
.a
);
845 n
->tx_timer
= qemu_new_timer(vm_clock
, virtio_net_tx_timer
, n
);
846 n
->tx_timer_active
= 0;
847 n
->mergeable_rx_bufs
= 0;
848 n
->promisc
= 1; /* for compatibility */
850 n
->mac_table
.macs
= qemu_mallocz(MAC_TABLE_ENTRIES
* ETH_ALEN
);
852 n
->vlans
= qemu_mallocz(MAX_VLAN
>> 3);
854 register_savevm("virtio-net", virtio_net_id
++, VIRTIO_NET_VM_VERSION
,
855 virtio_net_save
, virtio_net_load
, n
);
860 void virtio_net_exit(VirtIODevice
*vdev
)
862 VirtIONet
*n
= DO_UPCAST(VirtIONet
, vdev
, vdev
);
864 qemu_purge_queued_packets(n
->vc
);
866 unregister_savevm("virtio-net", n
);
868 qemu_free(n
->mac_table
.macs
);
871 qemu_del_timer(n
->tx_timer
);
872 qemu_free_timer(n
->tx_timer
);
874 virtio_cleanup(&n
->vdev
);
875 qemu_del_vlan_client(n
->vc
);