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.
14 #include "qemu/osdep.h"
16 #include "hw/virtio/virtio.h"
18 #include "net/checksum.h"
20 #include "qemu/error-report.h"
21 #include "qemu/timer.h"
22 #include "hw/virtio/virtio-net.h"
23 #include "net/vhost_net.h"
24 #include "hw/virtio/virtio-bus.h"
25 #include "qapi/qmp/qjson.h"
26 #include "qapi-event.h"
27 #include "hw/virtio/virtio-access.h"
28 #include "migration/misc.h"
30 #define VIRTIO_NET_VM_VERSION 11
32 #define MAC_TABLE_ENTRIES 64
33 #define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
35 /* previously fixed value */
36 #define VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE 256
37 #define VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE 256
39 /* for now, only allow larger queues; with virtio-1, guest can downsize */
40 #define VIRTIO_NET_RX_QUEUE_MIN_SIZE VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
41 #define VIRTIO_NET_TX_QUEUE_MIN_SIZE VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
44 * Calculate the number of bytes up to and including the given 'field' of
47 #define endof(container, field) \
48 (offsetof(container, field) + sizeof(((container *)0)->field))
50 typedef struct VirtIOFeature
{
55 static VirtIOFeature feature_sizes
[] = {
56 {.flags
= 1 << VIRTIO_NET_F_MAC
,
57 .end
= endof(struct virtio_net_config
, mac
)},
58 {.flags
= 1 << VIRTIO_NET_F_STATUS
,
59 .end
= endof(struct virtio_net_config
, status
)},
60 {.flags
= 1 << VIRTIO_NET_F_MQ
,
61 .end
= endof(struct virtio_net_config
, max_virtqueue_pairs
)},
62 {.flags
= 1 << VIRTIO_NET_F_MTU
,
63 .end
= endof(struct virtio_net_config
, mtu
)},
67 static VirtIONetQueue
*virtio_net_get_subqueue(NetClientState
*nc
)
69 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
71 return &n
->vqs
[nc
->queue_index
];
74 static int vq2q(int queue_index
)
76 return queue_index
/ 2;
80 * - we could suppress RX interrupt if we were so inclined.
83 static void virtio_net_get_config(VirtIODevice
*vdev
, uint8_t *config
)
85 VirtIONet
*n
= VIRTIO_NET(vdev
);
86 struct virtio_net_config netcfg
;
88 virtio_stw_p(vdev
, &netcfg
.status
, n
->status
);
89 virtio_stw_p(vdev
, &netcfg
.max_virtqueue_pairs
, n
->max_queues
);
90 virtio_stw_p(vdev
, &netcfg
.mtu
, n
->net_conf
.mtu
);
91 memcpy(netcfg
.mac
, n
->mac
, ETH_ALEN
);
92 memcpy(config
, &netcfg
, n
->config_size
);
95 static void virtio_net_set_config(VirtIODevice
*vdev
, const uint8_t *config
)
97 VirtIONet
*n
= VIRTIO_NET(vdev
);
98 struct virtio_net_config netcfg
= {};
100 memcpy(&netcfg
, config
, n
->config_size
);
102 if (!virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_CTRL_MAC_ADDR
) &&
103 !virtio_vdev_has_feature(vdev
, VIRTIO_F_VERSION_1
) &&
104 memcmp(netcfg
.mac
, n
->mac
, ETH_ALEN
)) {
105 memcpy(n
->mac
, netcfg
.mac
, ETH_ALEN
);
106 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->mac
);
110 static bool virtio_net_started(VirtIONet
*n
, uint8_t status
)
112 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
113 return (status
& VIRTIO_CONFIG_S_DRIVER_OK
) &&
114 (n
->status
& VIRTIO_NET_S_LINK_UP
) && vdev
->vm_running
;
117 static void virtio_net_announce_timer(void *opaque
)
119 VirtIONet
*n
= opaque
;
120 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
122 n
->announce_counter
--;
123 n
->status
|= VIRTIO_NET_S_ANNOUNCE
;
124 virtio_notify_config(vdev
);
127 static void virtio_net_vhost_status(VirtIONet
*n
, uint8_t status
)
129 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
130 NetClientState
*nc
= qemu_get_queue(n
->nic
);
131 int queues
= n
->multiqueue
? n
->max_queues
: 1;
133 if (!get_vhost_net(nc
->peer
)) {
137 if ((virtio_net_started(n
, status
) && !nc
->peer
->link_down
) ==
138 !!n
->vhost_started
) {
141 if (!n
->vhost_started
) {
144 if (n
->needs_vnet_hdr_swap
) {
145 error_report("backend does not support %s vnet headers; "
146 "falling back on userspace virtio",
147 virtio_is_big_endian(vdev
) ? "BE" : "LE");
151 /* Any packets outstanding? Purge them to avoid touching rings
152 * when vhost is running.
154 for (i
= 0; i
< queues
; i
++) {
155 NetClientState
*qnc
= qemu_get_subqueue(n
->nic
, i
);
157 /* Purge both directions: TX and RX. */
158 qemu_net_queue_purge(qnc
->peer
->incoming_queue
, qnc
);
159 qemu_net_queue_purge(qnc
->incoming_queue
, qnc
->peer
);
162 if (virtio_has_feature(vdev
->guest_features
, VIRTIO_NET_F_MTU
)) {
163 r
= vhost_net_set_mtu(get_vhost_net(nc
->peer
), n
->net_conf
.mtu
);
165 error_report("%uBytes MTU not supported by the backend",
172 n
->vhost_started
= 1;
173 r
= vhost_net_start(vdev
, n
->nic
->ncs
, queues
);
175 error_report("unable to start vhost net: %d: "
176 "falling back on userspace virtio", -r
);
177 n
->vhost_started
= 0;
180 vhost_net_stop(vdev
, n
->nic
->ncs
, queues
);
181 n
->vhost_started
= 0;
185 static int virtio_net_set_vnet_endian_one(VirtIODevice
*vdev
,
186 NetClientState
*peer
,
189 if (virtio_is_big_endian(vdev
)) {
190 return qemu_set_vnet_be(peer
, enable
);
192 return qemu_set_vnet_le(peer
, enable
);
196 static bool virtio_net_set_vnet_endian(VirtIODevice
*vdev
, NetClientState
*ncs
,
197 int queues
, bool enable
)
201 for (i
= 0; i
< queues
; i
++) {
202 if (virtio_net_set_vnet_endian_one(vdev
, ncs
[i
].peer
, enable
) < 0 &&
205 virtio_net_set_vnet_endian_one(vdev
, ncs
[i
].peer
, false);
215 static void virtio_net_vnet_endian_status(VirtIONet
*n
, uint8_t status
)
217 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
218 int queues
= n
->multiqueue
? n
->max_queues
: 1;
220 if (virtio_net_started(n
, status
)) {
221 /* Before using the device, we tell the network backend about the
222 * endianness to use when parsing vnet headers. If the backend
223 * can't do it, we fallback onto fixing the headers in the core
226 n
->needs_vnet_hdr_swap
= virtio_net_set_vnet_endian(vdev
, n
->nic
->ncs
,
228 } else if (virtio_net_started(n
, vdev
->status
)) {
229 /* After using the device, we need to reset the network backend to
230 * the default (guest native endianness), otherwise the guest may
231 * lose network connectivity if it is rebooted into a different
234 virtio_net_set_vnet_endian(vdev
, n
->nic
->ncs
, queues
, false);
238 static void virtio_net_drop_tx_queue_data(VirtIODevice
*vdev
, VirtQueue
*vq
)
240 unsigned int dropped
= virtqueue_drop_all(vq
);
242 virtio_notify(vdev
, vq
);
246 static void virtio_net_set_status(struct VirtIODevice
*vdev
, uint8_t status
)
248 VirtIONet
*n
= VIRTIO_NET(vdev
);
251 uint8_t queue_status
;
253 virtio_net_vnet_endian_status(n
, status
);
254 virtio_net_vhost_status(n
, status
);
256 for (i
= 0; i
< n
->max_queues
; i
++) {
257 NetClientState
*ncs
= qemu_get_subqueue(n
->nic
, i
);
261 if ((!n
->multiqueue
&& i
!= 0) || i
>= n
->curr_queues
) {
264 queue_status
= status
;
267 virtio_net_started(n
, queue_status
) && !n
->vhost_started
;
270 qemu_flush_queued_packets(ncs
);
273 if (!q
->tx_waiting
) {
279 timer_mod(q
->tx_timer
,
280 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
) + n
->tx_timeout
);
282 qemu_bh_schedule(q
->tx_bh
);
286 timer_del(q
->tx_timer
);
288 qemu_bh_cancel(q
->tx_bh
);
290 if ((n
->status
& VIRTIO_NET_S_LINK_UP
) == 0 &&
291 (queue_status
& VIRTIO_CONFIG_S_DRIVER_OK
) &&
293 /* if tx is waiting we are likely have some packets in tx queue
294 * and disabled notification */
296 virtio_queue_set_notification(q
->tx_vq
, 1);
297 virtio_net_drop_tx_queue_data(vdev
, q
->tx_vq
);
303 static void virtio_net_set_link_status(NetClientState
*nc
)
305 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
306 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
307 uint16_t old_status
= n
->status
;
310 n
->status
&= ~VIRTIO_NET_S_LINK_UP
;
312 n
->status
|= VIRTIO_NET_S_LINK_UP
;
314 if (n
->status
!= old_status
)
315 virtio_notify_config(vdev
);
317 virtio_net_set_status(vdev
, vdev
->status
);
320 static void rxfilter_notify(NetClientState
*nc
)
322 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
324 if (nc
->rxfilter_notify_enabled
) {
325 gchar
*path
= object_get_canonical_path(OBJECT(n
->qdev
));
326 qapi_event_send_nic_rx_filter_changed(!!n
->netclient_name
,
327 n
->netclient_name
, path
, &error_abort
);
330 /* disable event notification to avoid events flooding */
331 nc
->rxfilter_notify_enabled
= 0;
335 static intList
*get_vlan_table(VirtIONet
*n
)
337 intList
*list
, *entry
;
341 for (i
= 0; i
< MAX_VLAN
>> 5; i
++) {
342 for (j
= 0; n
->vlans
[i
] && j
<= 0x1f; j
++) {
343 if (n
->vlans
[i
] & (1U << j
)) {
344 entry
= g_malloc0(sizeof(*entry
));
345 entry
->value
= (i
<< 5) + j
;
355 static RxFilterInfo
*virtio_net_query_rxfilter(NetClientState
*nc
)
357 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
358 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
360 strList
*str_list
, *entry
;
363 info
= g_malloc0(sizeof(*info
));
364 info
->name
= g_strdup(nc
->name
);
365 info
->promiscuous
= n
->promisc
;
368 info
->unicast
= RX_STATE_NONE
;
369 } else if (n
->alluni
) {
370 info
->unicast
= RX_STATE_ALL
;
372 info
->unicast
= RX_STATE_NORMAL
;
376 info
->multicast
= RX_STATE_NONE
;
377 } else if (n
->allmulti
) {
378 info
->multicast
= RX_STATE_ALL
;
380 info
->multicast
= RX_STATE_NORMAL
;
383 info
->broadcast_allowed
= n
->nobcast
;
384 info
->multicast_overflow
= n
->mac_table
.multi_overflow
;
385 info
->unicast_overflow
= n
->mac_table
.uni_overflow
;
387 info
->main_mac
= qemu_mac_strdup_printf(n
->mac
);
390 for (i
= 0; i
< n
->mac_table
.first_multi
; i
++) {
391 entry
= g_malloc0(sizeof(*entry
));
392 entry
->value
= qemu_mac_strdup_printf(n
->mac_table
.macs
+ i
* ETH_ALEN
);
393 entry
->next
= str_list
;
396 info
->unicast_table
= str_list
;
399 for (i
= n
->mac_table
.first_multi
; i
< n
->mac_table
.in_use
; i
++) {
400 entry
= g_malloc0(sizeof(*entry
));
401 entry
->value
= qemu_mac_strdup_printf(n
->mac_table
.macs
+ i
* ETH_ALEN
);
402 entry
->next
= str_list
;
405 info
->multicast_table
= str_list
;
406 info
->vlan_table
= get_vlan_table(n
);
408 if (!virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_CTRL_VLAN
)) {
409 info
->vlan
= RX_STATE_ALL
;
410 } else if (!info
->vlan_table
) {
411 info
->vlan
= RX_STATE_NONE
;
413 info
->vlan
= RX_STATE_NORMAL
;
416 /* enable event notification after query */
417 nc
->rxfilter_notify_enabled
= 1;
422 static void virtio_net_reset(VirtIODevice
*vdev
)
424 VirtIONet
*n
= VIRTIO_NET(vdev
);
426 /* Reset back to compatibility mode */
433 /* multiqueue is disabled by default */
435 timer_del(n
->announce_timer
);
436 n
->announce_counter
= 0;
437 n
->status
&= ~VIRTIO_NET_S_ANNOUNCE
;
439 /* Flush any MAC and VLAN filter table state */
440 n
->mac_table
.in_use
= 0;
441 n
->mac_table
.first_multi
= 0;
442 n
->mac_table
.multi_overflow
= 0;
443 n
->mac_table
.uni_overflow
= 0;
444 memset(n
->mac_table
.macs
, 0, MAC_TABLE_ENTRIES
* ETH_ALEN
);
445 memcpy(&n
->mac
[0], &n
->nic
->conf
->macaddr
, sizeof(n
->mac
));
446 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->mac
);
447 memset(n
->vlans
, 0, MAX_VLAN
>> 3);
450 static void peer_test_vnet_hdr(VirtIONet
*n
)
452 NetClientState
*nc
= qemu_get_queue(n
->nic
);
457 n
->has_vnet_hdr
= qemu_has_vnet_hdr(nc
->peer
);
460 static int peer_has_vnet_hdr(VirtIONet
*n
)
462 return n
->has_vnet_hdr
;
465 static int peer_has_ufo(VirtIONet
*n
)
467 if (!peer_has_vnet_hdr(n
))
470 n
->has_ufo
= qemu_has_ufo(qemu_get_queue(n
->nic
)->peer
);
475 static void virtio_net_set_mrg_rx_bufs(VirtIONet
*n
, int mergeable_rx_bufs
,
481 n
->mergeable_rx_bufs
= mergeable_rx_bufs
;
484 n
->guest_hdr_len
= sizeof(struct virtio_net_hdr_mrg_rxbuf
);
486 n
->guest_hdr_len
= n
->mergeable_rx_bufs
?
487 sizeof(struct virtio_net_hdr_mrg_rxbuf
) :
488 sizeof(struct virtio_net_hdr
);
491 for (i
= 0; i
< n
->max_queues
; i
++) {
492 nc
= qemu_get_subqueue(n
->nic
, i
);
494 if (peer_has_vnet_hdr(n
) &&
495 qemu_has_vnet_hdr_len(nc
->peer
, n
->guest_hdr_len
)) {
496 qemu_set_vnet_hdr_len(nc
->peer
, n
->guest_hdr_len
);
497 n
->host_hdr_len
= n
->guest_hdr_len
;
502 static int virtio_net_max_tx_queue_size(VirtIONet
*n
)
504 NetClientState
*peer
= n
->nic_conf
.peers
.ncs
[0];
507 * Backends other than vhost-user don't support max queue size.
510 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
;
513 if (peer
->info
->type
!= NET_CLIENT_DRIVER_VHOST_USER
) {
514 return VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
;
517 return VIRTQUEUE_MAX_SIZE
;
520 static int peer_attach(VirtIONet
*n
, int index
)
522 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, index
);
528 if (nc
->peer
->info
->type
== NET_CLIENT_DRIVER_VHOST_USER
) {
529 vhost_set_vring_enable(nc
->peer
, 1);
532 if (nc
->peer
->info
->type
!= NET_CLIENT_DRIVER_TAP
) {
536 if (n
->max_queues
== 1) {
540 return tap_enable(nc
->peer
);
543 static int peer_detach(VirtIONet
*n
, int index
)
545 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, index
);
551 if (nc
->peer
->info
->type
== NET_CLIENT_DRIVER_VHOST_USER
) {
552 vhost_set_vring_enable(nc
->peer
, 0);
555 if (nc
->peer
->info
->type
!= NET_CLIENT_DRIVER_TAP
) {
559 return tap_disable(nc
->peer
);
562 static void virtio_net_set_queues(VirtIONet
*n
)
567 if (n
->nic
->peer_deleted
) {
571 for (i
= 0; i
< n
->max_queues
; i
++) {
572 if (i
< n
->curr_queues
) {
573 r
= peer_attach(n
, i
);
576 r
= peer_detach(n
, i
);
582 static void virtio_net_set_multiqueue(VirtIONet
*n
, int multiqueue
);
584 static uint64_t virtio_net_get_features(VirtIODevice
*vdev
, uint64_t features
,
587 VirtIONet
*n
= VIRTIO_NET(vdev
);
588 NetClientState
*nc
= qemu_get_queue(n
->nic
);
590 /* Firstly sync all virtio-net possible supported features */
591 features
|= n
->host_features
;
593 virtio_add_feature(&features
, VIRTIO_NET_F_MAC
);
595 if (!peer_has_vnet_hdr(n
)) {
596 virtio_clear_feature(&features
, VIRTIO_NET_F_CSUM
);
597 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_TSO4
);
598 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_TSO6
);
599 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_ECN
);
601 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_CSUM
);
602 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_TSO4
);
603 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_TSO6
);
604 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_ECN
);
607 if (!peer_has_vnet_hdr(n
) || !peer_has_ufo(n
)) {
608 virtio_clear_feature(&features
, VIRTIO_NET_F_GUEST_UFO
);
609 virtio_clear_feature(&features
, VIRTIO_NET_F_HOST_UFO
);
612 if (!get_vhost_net(nc
->peer
)) {
615 features
= vhost_net_get_features(get_vhost_net(nc
->peer
), features
);
616 vdev
->backend_features
= features
;
618 if (n
->mtu_bypass_backend
&&
619 (n
->host_features
& 1ULL << VIRTIO_NET_F_MTU
)) {
620 features
|= (1ULL << VIRTIO_NET_F_MTU
);
626 static uint64_t virtio_net_bad_features(VirtIODevice
*vdev
)
628 uint64_t features
= 0;
630 /* Linux kernel 2.6.25. It understood MAC (as everyone must),
632 virtio_add_feature(&features
, VIRTIO_NET_F_MAC
);
633 virtio_add_feature(&features
, VIRTIO_NET_F_CSUM
);
634 virtio_add_feature(&features
, VIRTIO_NET_F_HOST_TSO4
);
635 virtio_add_feature(&features
, VIRTIO_NET_F_HOST_TSO6
);
636 virtio_add_feature(&features
, VIRTIO_NET_F_HOST_ECN
);
641 static void virtio_net_apply_guest_offloads(VirtIONet
*n
)
643 qemu_set_offload(qemu_get_queue(n
->nic
)->peer
,
644 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_CSUM
)),
645 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_TSO4
)),
646 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_TSO6
)),
647 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_ECN
)),
648 !!(n
->curr_guest_offloads
& (1ULL << VIRTIO_NET_F_GUEST_UFO
)));
651 static uint64_t virtio_net_guest_offloads_by_features(uint32_t features
)
653 static const uint64_t guest_offloads_mask
=
654 (1ULL << VIRTIO_NET_F_GUEST_CSUM
) |
655 (1ULL << VIRTIO_NET_F_GUEST_TSO4
) |
656 (1ULL << VIRTIO_NET_F_GUEST_TSO6
) |
657 (1ULL << VIRTIO_NET_F_GUEST_ECN
) |
658 (1ULL << VIRTIO_NET_F_GUEST_UFO
);
660 return guest_offloads_mask
& features
;
663 static inline uint64_t virtio_net_supported_guest_offloads(VirtIONet
*n
)
665 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
666 return virtio_net_guest_offloads_by_features(vdev
->guest_features
);
669 static void virtio_net_set_features(VirtIODevice
*vdev
, uint64_t features
)
671 VirtIONet
*n
= VIRTIO_NET(vdev
);
674 if (n
->mtu_bypass_backend
&&
675 !virtio_has_feature(vdev
->backend_features
, VIRTIO_NET_F_MTU
)) {
676 features
&= ~(1ULL << VIRTIO_NET_F_MTU
);
679 virtio_net_set_multiqueue(n
,
680 virtio_has_feature(features
, VIRTIO_NET_F_MQ
));
682 virtio_net_set_mrg_rx_bufs(n
,
683 virtio_has_feature(features
,
684 VIRTIO_NET_F_MRG_RXBUF
),
685 virtio_has_feature(features
,
686 VIRTIO_F_VERSION_1
));
688 if (n
->has_vnet_hdr
) {
689 n
->curr_guest_offloads
=
690 virtio_net_guest_offloads_by_features(features
);
691 virtio_net_apply_guest_offloads(n
);
694 for (i
= 0; i
< n
->max_queues
; i
++) {
695 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, i
);
697 if (!get_vhost_net(nc
->peer
)) {
700 vhost_net_ack_features(get_vhost_net(nc
->peer
), features
);
703 if (virtio_has_feature(features
, VIRTIO_NET_F_CTRL_VLAN
)) {
704 memset(n
->vlans
, 0, MAX_VLAN
>> 3);
706 memset(n
->vlans
, 0xff, MAX_VLAN
>> 3);
710 static int virtio_net_handle_rx_mode(VirtIONet
*n
, uint8_t cmd
,
711 struct iovec
*iov
, unsigned int iov_cnt
)
715 NetClientState
*nc
= qemu_get_queue(n
->nic
);
717 s
= iov_to_buf(iov
, iov_cnt
, 0, &on
, sizeof(on
));
718 if (s
!= sizeof(on
)) {
719 return VIRTIO_NET_ERR
;
722 if (cmd
== VIRTIO_NET_CTRL_RX_PROMISC
) {
724 } else if (cmd
== VIRTIO_NET_CTRL_RX_ALLMULTI
) {
726 } else if (cmd
== VIRTIO_NET_CTRL_RX_ALLUNI
) {
728 } else if (cmd
== VIRTIO_NET_CTRL_RX_NOMULTI
) {
730 } else if (cmd
== VIRTIO_NET_CTRL_RX_NOUNI
) {
732 } else if (cmd
== VIRTIO_NET_CTRL_RX_NOBCAST
) {
735 return VIRTIO_NET_ERR
;
740 return VIRTIO_NET_OK
;
743 static int virtio_net_handle_offloads(VirtIONet
*n
, uint8_t cmd
,
744 struct iovec
*iov
, unsigned int iov_cnt
)
746 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
750 if (!virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
)) {
751 return VIRTIO_NET_ERR
;
754 s
= iov_to_buf(iov
, iov_cnt
, 0, &offloads
, sizeof(offloads
));
755 if (s
!= sizeof(offloads
)) {
756 return VIRTIO_NET_ERR
;
759 if (cmd
== VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET
) {
760 uint64_t supported_offloads
;
762 offloads
= virtio_ldq_p(vdev
, &offloads
);
764 if (!n
->has_vnet_hdr
) {
765 return VIRTIO_NET_ERR
;
768 supported_offloads
= virtio_net_supported_guest_offloads(n
);
769 if (offloads
& ~supported_offloads
) {
770 return VIRTIO_NET_ERR
;
773 n
->curr_guest_offloads
= offloads
;
774 virtio_net_apply_guest_offloads(n
);
776 return VIRTIO_NET_OK
;
778 return VIRTIO_NET_ERR
;
782 static int virtio_net_handle_mac(VirtIONet
*n
, uint8_t cmd
,
783 struct iovec
*iov
, unsigned int iov_cnt
)
785 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
786 struct virtio_net_ctrl_mac mac_data
;
788 NetClientState
*nc
= qemu_get_queue(n
->nic
);
790 if (cmd
== VIRTIO_NET_CTRL_MAC_ADDR_SET
) {
791 if (iov_size(iov
, iov_cnt
) != sizeof(n
->mac
)) {
792 return VIRTIO_NET_ERR
;
794 s
= iov_to_buf(iov
, iov_cnt
, 0, &n
->mac
, sizeof(n
->mac
));
795 assert(s
== sizeof(n
->mac
));
796 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->mac
);
799 return VIRTIO_NET_OK
;
802 if (cmd
!= VIRTIO_NET_CTRL_MAC_TABLE_SET
) {
803 return VIRTIO_NET_ERR
;
808 uint8_t uni_overflow
= 0;
809 uint8_t multi_overflow
= 0;
810 uint8_t *macs
= g_malloc0(MAC_TABLE_ENTRIES
* ETH_ALEN
);
812 s
= iov_to_buf(iov
, iov_cnt
, 0, &mac_data
.entries
,
813 sizeof(mac_data
.entries
));
814 mac_data
.entries
= virtio_ldl_p(vdev
, &mac_data
.entries
);
815 if (s
!= sizeof(mac_data
.entries
)) {
818 iov_discard_front(&iov
, &iov_cnt
, s
);
820 if (mac_data
.entries
* ETH_ALEN
> iov_size(iov
, iov_cnt
)) {
824 if (mac_data
.entries
<= MAC_TABLE_ENTRIES
) {
825 s
= iov_to_buf(iov
, iov_cnt
, 0, macs
,
826 mac_data
.entries
* ETH_ALEN
);
827 if (s
!= mac_data
.entries
* ETH_ALEN
) {
830 in_use
+= mac_data
.entries
;
835 iov_discard_front(&iov
, &iov_cnt
, mac_data
.entries
* ETH_ALEN
);
837 first_multi
= in_use
;
839 s
= iov_to_buf(iov
, iov_cnt
, 0, &mac_data
.entries
,
840 sizeof(mac_data
.entries
));
841 mac_data
.entries
= virtio_ldl_p(vdev
, &mac_data
.entries
);
842 if (s
!= sizeof(mac_data
.entries
)) {
846 iov_discard_front(&iov
, &iov_cnt
, s
);
848 if (mac_data
.entries
* ETH_ALEN
!= iov_size(iov
, iov_cnt
)) {
852 if (mac_data
.entries
<= MAC_TABLE_ENTRIES
- in_use
) {
853 s
= iov_to_buf(iov
, iov_cnt
, 0, &macs
[in_use
* ETH_ALEN
],
854 mac_data
.entries
* ETH_ALEN
);
855 if (s
!= mac_data
.entries
* ETH_ALEN
) {
858 in_use
+= mac_data
.entries
;
863 n
->mac_table
.in_use
= in_use
;
864 n
->mac_table
.first_multi
= first_multi
;
865 n
->mac_table
.uni_overflow
= uni_overflow
;
866 n
->mac_table
.multi_overflow
= multi_overflow
;
867 memcpy(n
->mac_table
.macs
, macs
, MAC_TABLE_ENTRIES
* ETH_ALEN
);
871 return VIRTIO_NET_OK
;
875 return VIRTIO_NET_ERR
;
878 static int virtio_net_handle_vlan_table(VirtIONet
*n
, uint8_t cmd
,
879 struct iovec
*iov
, unsigned int iov_cnt
)
881 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
884 NetClientState
*nc
= qemu_get_queue(n
->nic
);
886 s
= iov_to_buf(iov
, iov_cnt
, 0, &vid
, sizeof(vid
));
887 vid
= virtio_lduw_p(vdev
, &vid
);
888 if (s
!= sizeof(vid
)) {
889 return VIRTIO_NET_ERR
;
893 return VIRTIO_NET_ERR
;
895 if (cmd
== VIRTIO_NET_CTRL_VLAN_ADD
)
896 n
->vlans
[vid
>> 5] |= (1U << (vid
& 0x1f));
897 else if (cmd
== VIRTIO_NET_CTRL_VLAN_DEL
)
898 n
->vlans
[vid
>> 5] &= ~(1U << (vid
& 0x1f));
900 return VIRTIO_NET_ERR
;
904 return VIRTIO_NET_OK
;
907 static int virtio_net_handle_announce(VirtIONet
*n
, uint8_t cmd
,
908 struct iovec
*iov
, unsigned int iov_cnt
)
910 if (cmd
== VIRTIO_NET_CTRL_ANNOUNCE_ACK
&&
911 n
->status
& VIRTIO_NET_S_ANNOUNCE
) {
912 n
->status
&= ~VIRTIO_NET_S_ANNOUNCE
;
913 if (n
->announce_counter
) {
914 timer_mod(n
->announce_timer
,
915 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL
) +
916 self_announce_delay(n
->announce_counter
));
918 return VIRTIO_NET_OK
;
920 return VIRTIO_NET_ERR
;
924 static int virtio_net_handle_mq(VirtIONet
*n
, uint8_t cmd
,
925 struct iovec
*iov
, unsigned int iov_cnt
)
927 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
928 struct virtio_net_ctrl_mq mq
;
932 s
= iov_to_buf(iov
, iov_cnt
, 0, &mq
, sizeof(mq
));
933 if (s
!= sizeof(mq
)) {
934 return VIRTIO_NET_ERR
;
937 if (cmd
!= VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
) {
938 return VIRTIO_NET_ERR
;
941 queues
= virtio_lduw_p(vdev
, &mq
.virtqueue_pairs
);
943 if (queues
< VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN
||
944 queues
> VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX
||
945 queues
> n
->max_queues
||
947 return VIRTIO_NET_ERR
;
950 n
->curr_queues
= queues
;
951 /* stop the backend before changing the number of queues to avoid handling a
953 virtio_net_set_status(vdev
, vdev
->status
);
954 virtio_net_set_queues(n
);
956 return VIRTIO_NET_OK
;
959 static void virtio_net_handle_ctrl(VirtIODevice
*vdev
, VirtQueue
*vq
)
961 VirtIONet
*n
= VIRTIO_NET(vdev
);
962 struct virtio_net_ctrl_hdr ctrl
;
963 virtio_net_ctrl_ack status
= VIRTIO_NET_ERR
;
964 VirtQueueElement
*elem
;
966 struct iovec
*iov
, *iov2
;
967 unsigned int iov_cnt
;
970 elem
= virtqueue_pop(vq
, sizeof(VirtQueueElement
));
974 if (iov_size(elem
->in_sg
, elem
->in_num
) < sizeof(status
) ||
975 iov_size(elem
->out_sg
, elem
->out_num
) < sizeof(ctrl
)) {
976 virtio_error(vdev
, "virtio-net ctrl missing headers");
977 virtqueue_detach_element(vq
, elem
, 0);
982 iov_cnt
= elem
->out_num
;
983 iov2
= iov
= g_memdup(elem
->out_sg
, sizeof(struct iovec
) * elem
->out_num
);
984 s
= iov_to_buf(iov
, iov_cnt
, 0, &ctrl
, sizeof(ctrl
));
985 iov_discard_front(&iov
, &iov_cnt
, sizeof(ctrl
));
986 if (s
!= sizeof(ctrl
)) {
987 status
= VIRTIO_NET_ERR
;
988 } else if (ctrl
.class == VIRTIO_NET_CTRL_RX
) {
989 status
= virtio_net_handle_rx_mode(n
, ctrl
.cmd
, iov
, iov_cnt
);
990 } else if (ctrl
.class == VIRTIO_NET_CTRL_MAC
) {
991 status
= virtio_net_handle_mac(n
, ctrl
.cmd
, iov
, iov_cnt
);
992 } else if (ctrl
.class == VIRTIO_NET_CTRL_VLAN
) {
993 status
= virtio_net_handle_vlan_table(n
, ctrl
.cmd
, iov
, iov_cnt
);
994 } else if (ctrl
.class == VIRTIO_NET_CTRL_ANNOUNCE
) {
995 status
= virtio_net_handle_announce(n
, ctrl
.cmd
, iov
, iov_cnt
);
996 } else if (ctrl
.class == VIRTIO_NET_CTRL_MQ
) {
997 status
= virtio_net_handle_mq(n
, ctrl
.cmd
, iov
, iov_cnt
);
998 } else if (ctrl
.class == VIRTIO_NET_CTRL_GUEST_OFFLOADS
) {
999 status
= virtio_net_handle_offloads(n
, ctrl
.cmd
, iov
, iov_cnt
);
1002 s
= iov_from_buf(elem
->in_sg
, elem
->in_num
, 0, &status
, sizeof(status
));
1003 assert(s
== sizeof(status
));
1005 virtqueue_push(vq
, elem
, sizeof(status
));
1006 virtio_notify(vdev
, vq
);
1014 static void virtio_net_handle_rx(VirtIODevice
*vdev
, VirtQueue
*vq
)
1016 VirtIONet
*n
= VIRTIO_NET(vdev
);
1017 int queue_index
= vq2q(virtio_get_queue_index(vq
));
1019 qemu_flush_queued_packets(qemu_get_subqueue(n
->nic
, queue_index
));
1022 static int virtio_net_can_receive(NetClientState
*nc
)
1024 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
1025 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1026 VirtIONetQueue
*q
= virtio_net_get_subqueue(nc
);
1028 if (!vdev
->vm_running
) {
1032 if (nc
->queue_index
>= n
->curr_queues
) {
1036 if (!virtio_queue_ready(q
->rx_vq
) ||
1037 !(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1044 static int virtio_net_has_buffers(VirtIONetQueue
*q
, int bufsize
)
1046 VirtIONet
*n
= q
->n
;
1047 if (virtio_queue_empty(q
->rx_vq
) ||
1048 (n
->mergeable_rx_bufs
&&
1049 !virtqueue_avail_bytes(q
->rx_vq
, bufsize
, 0))) {
1050 virtio_queue_set_notification(q
->rx_vq
, 1);
1052 /* To avoid a race condition where the guest has made some buffers
1053 * available after the above check but before notification was
1054 * enabled, check for available buffers again.
1056 if (virtio_queue_empty(q
->rx_vq
) ||
1057 (n
->mergeable_rx_bufs
&&
1058 !virtqueue_avail_bytes(q
->rx_vq
, bufsize
, 0))) {
1063 virtio_queue_set_notification(q
->rx_vq
, 0);
1067 static void virtio_net_hdr_swap(VirtIODevice
*vdev
, struct virtio_net_hdr
*hdr
)
1069 virtio_tswap16s(vdev
, &hdr
->hdr_len
);
1070 virtio_tswap16s(vdev
, &hdr
->gso_size
);
1071 virtio_tswap16s(vdev
, &hdr
->csum_start
);
1072 virtio_tswap16s(vdev
, &hdr
->csum_offset
);
1075 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
1076 * it never finds out that the packets don't have valid checksums. This
1077 * causes dhclient to get upset. Fedora's carried a patch for ages to
1078 * fix this with Xen but it hasn't appeared in an upstream release of
1081 * To avoid breaking existing guests, we catch udp packets and add
1082 * checksums. This is terrible but it's better than hacking the guest
1085 * N.B. if we introduce a zero-copy API, this operation is no longer free so
1086 * we should provide a mechanism to disable it to avoid polluting the host
1089 static void work_around_broken_dhclient(struct virtio_net_hdr
*hdr
,
1090 uint8_t *buf
, size_t size
)
1092 if ((hdr
->flags
& VIRTIO_NET_HDR_F_NEEDS_CSUM
) && /* missing csum */
1093 (size
> 27 && size
< 1500) && /* normal sized MTU */
1094 (buf
[12] == 0x08 && buf
[13] == 0x00) && /* ethertype == IPv4 */
1095 (buf
[23] == 17) && /* ip.protocol == UDP */
1096 (buf
[34] == 0 && buf
[35] == 67)) { /* udp.srcport == bootps */
1097 net_checksum_calculate(buf
, size
);
1098 hdr
->flags
&= ~VIRTIO_NET_HDR_F_NEEDS_CSUM
;
1102 static void receive_header(VirtIONet
*n
, const struct iovec
*iov
, int iov_cnt
,
1103 const void *buf
, size_t size
)
1105 if (n
->has_vnet_hdr
) {
1106 /* FIXME this cast is evil */
1107 void *wbuf
= (void *)buf
;
1108 work_around_broken_dhclient(wbuf
, wbuf
+ n
->host_hdr_len
,
1109 size
- n
->host_hdr_len
);
1111 if (n
->needs_vnet_hdr_swap
) {
1112 virtio_net_hdr_swap(VIRTIO_DEVICE(n
), wbuf
);
1114 iov_from_buf(iov
, iov_cnt
, 0, buf
, sizeof(struct virtio_net_hdr
));
1116 struct virtio_net_hdr hdr
= {
1118 .gso_type
= VIRTIO_NET_HDR_GSO_NONE
1120 iov_from_buf(iov
, iov_cnt
, 0, &hdr
, sizeof hdr
);
1124 static int receive_filter(VirtIONet
*n
, const uint8_t *buf
, int size
)
1126 static const uint8_t bcast
[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1127 static const uint8_t vlan
[] = {0x81, 0x00};
1128 uint8_t *ptr
= (uint8_t *)buf
;
1134 ptr
+= n
->host_hdr_len
;
1136 if (!memcmp(&ptr
[12], vlan
, sizeof(vlan
))) {
1137 int vid
= lduw_be_p(ptr
+ 14) & 0xfff;
1138 if (!(n
->vlans
[vid
>> 5] & (1U << (vid
& 0x1f))))
1142 if (ptr
[0] & 1) { // multicast
1143 if (!memcmp(ptr
, bcast
, sizeof(bcast
))) {
1145 } else if (n
->nomulti
) {
1147 } else if (n
->allmulti
|| n
->mac_table
.multi_overflow
) {
1151 for (i
= n
->mac_table
.first_multi
; i
< n
->mac_table
.in_use
; i
++) {
1152 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
1159 } else if (n
->alluni
|| n
->mac_table
.uni_overflow
) {
1161 } else if (!memcmp(ptr
, n
->mac
, ETH_ALEN
)) {
1165 for (i
= 0; i
< n
->mac_table
.first_multi
; i
++) {
1166 if (!memcmp(ptr
, &n
->mac_table
.macs
[i
* ETH_ALEN
], ETH_ALEN
)) {
1175 static ssize_t
virtio_net_receive_rcu(NetClientState
*nc
, const uint8_t *buf
,
1178 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
1179 VirtIONetQueue
*q
= virtio_net_get_subqueue(nc
);
1180 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1181 struct iovec mhdr_sg
[VIRTQUEUE_MAX_SIZE
];
1182 struct virtio_net_hdr_mrg_rxbuf mhdr
;
1183 unsigned mhdr_cnt
= 0;
1184 size_t offset
, i
, guest_offset
;
1186 if (!virtio_net_can_receive(nc
)) {
1190 /* hdr_len refers to the header we supply to the guest */
1191 if (!virtio_net_has_buffers(q
, size
+ n
->guest_hdr_len
- n
->host_hdr_len
)) {
1195 if (!receive_filter(n
, buf
, size
))
1200 while (offset
< size
) {
1201 VirtQueueElement
*elem
;
1203 const struct iovec
*sg
;
1207 elem
= virtqueue_pop(q
->rx_vq
, sizeof(VirtQueueElement
));
1210 virtio_error(vdev
, "virtio-net unexpected empty queue: "
1211 "i %zd mergeable %d offset %zd, size %zd, "
1212 "guest hdr len %zd, host hdr len %zd "
1213 "guest features 0x%" PRIx64
,
1214 i
, n
->mergeable_rx_bufs
, offset
, size
,
1215 n
->guest_hdr_len
, n
->host_hdr_len
,
1216 vdev
->guest_features
);
1221 if (elem
->in_num
< 1) {
1223 "virtio-net receive queue contains no in buffers");
1224 virtqueue_detach_element(q
->rx_vq
, elem
, 0);
1231 assert(offset
== 0);
1232 if (n
->mergeable_rx_bufs
) {
1233 mhdr_cnt
= iov_copy(mhdr_sg
, ARRAY_SIZE(mhdr_sg
),
1235 offsetof(typeof(mhdr
), num_buffers
),
1236 sizeof(mhdr
.num_buffers
));
1239 receive_header(n
, sg
, elem
->in_num
, buf
, size
);
1240 offset
= n
->host_hdr_len
;
1241 total
+= n
->guest_hdr_len
;
1242 guest_offset
= n
->guest_hdr_len
;
1247 /* copy in packet. ugh */
1248 len
= iov_from_buf(sg
, elem
->in_num
, guest_offset
,
1249 buf
+ offset
, size
- offset
);
1252 /* If buffers can't be merged, at this point we
1253 * must have consumed the complete packet.
1254 * Otherwise, drop it. */
1255 if (!n
->mergeable_rx_bufs
&& offset
< size
) {
1256 virtqueue_unpop(q
->rx_vq
, elem
, total
);
1261 /* signal other side */
1262 virtqueue_fill(q
->rx_vq
, elem
, total
, i
++);
1267 virtio_stw_p(vdev
, &mhdr
.num_buffers
, i
);
1268 iov_from_buf(mhdr_sg
, mhdr_cnt
,
1270 &mhdr
.num_buffers
, sizeof mhdr
.num_buffers
);
1273 virtqueue_flush(q
->rx_vq
, i
);
1274 virtio_notify(vdev
, q
->rx_vq
);
1279 static ssize_t
virtio_net_receive(NetClientState
*nc
, const uint8_t *buf
,
1285 r
= virtio_net_receive_rcu(nc
, buf
, size
);
1290 static int32_t virtio_net_flush_tx(VirtIONetQueue
*q
);
1292 static void virtio_net_tx_complete(NetClientState
*nc
, ssize_t len
)
1294 VirtIONet
*n
= qemu_get_nic_opaque(nc
);
1295 VirtIONetQueue
*q
= virtio_net_get_subqueue(nc
);
1296 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1298 virtqueue_push(q
->tx_vq
, q
->async_tx
.elem
, 0);
1299 virtio_notify(vdev
, q
->tx_vq
);
1301 g_free(q
->async_tx
.elem
);
1302 q
->async_tx
.elem
= NULL
;
1304 virtio_queue_set_notification(q
->tx_vq
, 1);
1305 virtio_net_flush_tx(q
);
1309 static int32_t virtio_net_flush_tx(VirtIONetQueue
*q
)
1311 VirtIONet
*n
= q
->n
;
1312 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1313 VirtQueueElement
*elem
;
1314 int32_t num_packets
= 0;
1315 int queue_index
= vq2q(virtio_get_queue_index(q
->tx_vq
));
1316 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1320 if (q
->async_tx
.elem
) {
1321 virtio_queue_set_notification(q
->tx_vq
, 0);
1327 unsigned int out_num
;
1328 struct iovec sg
[VIRTQUEUE_MAX_SIZE
], sg2
[VIRTQUEUE_MAX_SIZE
+ 1], *out_sg
;
1329 struct virtio_net_hdr_mrg_rxbuf mhdr
;
1331 elem
= virtqueue_pop(q
->tx_vq
, sizeof(VirtQueueElement
));
1336 out_num
= elem
->out_num
;
1337 out_sg
= elem
->out_sg
;
1339 virtio_error(vdev
, "virtio-net header not in first element");
1340 virtqueue_detach_element(q
->tx_vq
, elem
, 0);
1345 if (n
->has_vnet_hdr
) {
1346 if (iov_to_buf(out_sg
, out_num
, 0, &mhdr
, n
->guest_hdr_len
) <
1348 virtio_error(vdev
, "virtio-net header incorrect");
1349 virtqueue_detach_element(q
->tx_vq
, elem
, 0);
1353 if (n
->needs_vnet_hdr_swap
) {
1354 virtio_net_hdr_swap(vdev
, (void *) &mhdr
);
1355 sg2
[0].iov_base
= &mhdr
;
1356 sg2
[0].iov_len
= n
->guest_hdr_len
;
1357 out_num
= iov_copy(&sg2
[1], ARRAY_SIZE(sg2
) - 1,
1359 n
->guest_hdr_len
, -1);
1360 if (out_num
== VIRTQUEUE_MAX_SIZE
) {
1368 * If host wants to see the guest header as is, we can
1369 * pass it on unchanged. Otherwise, copy just the parts
1370 * that host is interested in.
1372 assert(n
->host_hdr_len
<= n
->guest_hdr_len
);
1373 if (n
->host_hdr_len
!= n
->guest_hdr_len
) {
1374 unsigned sg_num
= iov_copy(sg
, ARRAY_SIZE(sg
),
1376 0, n
->host_hdr_len
);
1377 sg_num
+= iov_copy(sg
+ sg_num
, ARRAY_SIZE(sg
) - sg_num
,
1379 n
->guest_hdr_len
, -1);
1384 ret
= qemu_sendv_packet_async(qemu_get_subqueue(n
->nic
, queue_index
),
1385 out_sg
, out_num
, virtio_net_tx_complete
);
1387 virtio_queue_set_notification(q
->tx_vq
, 0);
1388 q
->async_tx
.elem
= elem
;
1393 virtqueue_push(q
->tx_vq
, elem
, 0);
1394 virtio_notify(vdev
, q
->tx_vq
);
1397 if (++num_packets
>= n
->tx_burst
) {
1404 static void virtio_net_handle_tx_timer(VirtIODevice
*vdev
, VirtQueue
*vq
)
1406 VirtIONet
*n
= VIRTIO_NET(vdev
);
1407 VirtIONetQueue
*q
= &n
->vqs
[vq2q(virtio_get_queue_index(vq
))];
1409 if (unlikely((n
->status
& VIRTIO_NET_S_LINK_UP
) == 0)) {
1410 virtio_net_drop_tx_queue_data(vdev
, vq
);
1414 /* This happens when device was stopped but VCPU wasn't. */
1415 if (!vdev
->vm_running
) {
1420 if (q
->tx_waiting
) {
1421 virtio_queue_set_notification(vq
, 1);
1422 timer_del(q
->tx_timer
);
1424 if (virtio_net_flush_tx(q
) == -EINVAL
) {
1428 timer_mod(q
->tx_timer
,
1429 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL
) + n
->tx_timeout
);
1431 virtio_queue_set_notification(vq
, 0);
1435 static void virtio_net_handle_tx_bh(VirtIODevice
*vdev
, VirtQueue
*vq
)
1437 VirtIONet
*n
= VIRTIO_NET(vdev
);
1438 VirtIONetQueue
*q
= &n
->vqs
[vq2q(virtio_get_queue_index(vq
))];
1440 if (unlikely((n
->status
& VIRTIO_NET_S_LINK_UP
) == 0)) {
1441 virtio_net_drop_tx_queue_data(vdev
, vq
);
1445 if (unlikely(q
->tx_waiting
)) {
1449 /* This happens when device was stopped but VCPU wasn't. */
1450 if (!vdev
->vm_running
) {
1453 virtio_queue_set_notification(vq
, 0);
1454 qemu_bh_schedule(q
->tx_bh
);
1457 static void virtio_net_tx_timer(void *opaque
)
1459 VirtIONetQueue
*q
= opaque
;
1460 VirtIONet
*n
= q
->n
;
1461 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1462 /* This happens when device was stopped but BH wasn't. */
1463 if (!vdev
->vm_running
) {
1464 /* Make sure tx waiting is set, so we'll run when restarted. */
1465 assert(q
->tx_waiting
);
1471 /* Just in case the driver is not ready on more */
1472 if (!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
)) {
1476 virtio_queue_set_notification(q
->tx_vq
, 1);
1477 virtio_net_flush_tx(q
);
1480 static void virtio_net_tx_bh(void *opaque
)
1482 VirtIONetQueue
*q
= opaque
;
1483 VirtIONet
*n
= q
->n
;
1484 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1487 /* This happens when device was stopped but BH wasn't. */
1488 if (!vdev
->vm_running
) {
1489 /* Make sure tx waiting is set, so we'll run when restarted. */
1490 assert(q
->tx_waiting
);
1496 /* Just in case the driver is not ready on more */
1497 if (unlikely(!(vdev
->status
& VIRTIO_CONFIG_S_DRIVER_OK
))) {
1501 ret
= virtio_net_flush_tx(q
);
1502 if (ret
== -EBUSY
|| ret
== -EINVAL
) {
1503 return; /* Notification re-enable handled by tx_complete or device
1507 /* If we flush a full burst of packets, assume there are
1508 * more coming and immediately reschedule */
1509 if (ret
>= n
->tx_burst
) {
1510 qemu_bh_schedule(q
->tx_bh
);
1515 /* If less than a full burst, re-enable notification and flush
1516 * anything that may have come in while we weren't looking. If
1517 * we find something, assume the guest is still active and reschedule */
1518 virtio_queue_set_notification(q
->tx_vq
, 1);
1519 ret
= virtio_net_flush_tx(q
);
1520 if (ret
== -EINVAL
) {
1522 } else if (ret
> 0) {
1523 virtio_queue_set_notification(q
->tx_vq
, 0);
1524 qemu_bh_schedule(q
->tx_bh
);
1529 static void virtio_net_add_queue(VirtIONet
*n
, int index
)
1531 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1533 n
->vqs
[index
].rx_vq
= virtio_add_queue(vdev
, n
->net_conf
.rx_queue_size
,
1534 virtio_net_handle_rx
);
1536 if (n
->net_conf
.tx
&& !strcmp(n
->net_conf
.tx
, "timer")) {
1537 n
->vqs
[index
].tx_vq
=
1538 virtio_add_queue(vdev
, n
->net_conf
.tx_queue_size
,
1539 virtio_net_handle_tx_timer
);
1540 n
->vqs
[index
].tx_timer
= timer_new_ns(QEMU_CLOCK_VIRTUAL
,
1541 virtio_net_tx_timer
,
1544 n
->vqs
[index
].tx_vq
=
1545 virtio_add_queue(vdev
, n
->net_conf
.tx_queue_size
,
1546 virtio_net_handle_tx_bh
);
1547 n
->vqs
[index
].tx_bh
= qemu_bh_new(virtio_net_tx_bh
, &n
->vqs
[index
]);
1550 n
->vqs
[index
].tx_waiting
= 0;
1551 n
->vqs
[index
].n
= n
;
1554 static void virtio_net_del_queue(VirtIONet
*n
, int index
)
1556 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1557 VirtIONetQueue
*q
= &n
->vqs
[index
];
1558 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, index
);
1560 qemu_purge_queued_packets(nc
);
1562 virtio_del_queue(vdev
, index
* 2);
1564 timer_del(q
->tx_timer
);
1565 timer_free(q
->tx_timer
);
1568 qemu_bh_delete(q
->tx_bh
);
1572 virtio_del_queue(vdev
, index
* 2 + 1);
1575 static void virtio_net_change_num_queues(VirtIONet
*n
, int new_max_queues
)
1577 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1578 int old_num_queues
= virtio_get_num_queues(vdev
);
1579 int new_num_queues
= new_max_queues
* 2 + 1;
1582 assert(old_num_queues
>= 3);
1583 assert(old_num_queues
% 2 == 1);
1585 if (old_num_queues
== new_num_queues
) {
1590 * We always need to remove and add ctrl vq if
1591 * old_num_queues != new_num_queues. Remove ctrl_vq first,
1592 * and then we only enter one of the following too loops.
1594 virtio_del_queue(vdev
, old_num_queues
- 1);
1596 for (i
= new_num_queues
- 1; i
< old_num_queues
- 1; i
+= 2) {
1597 /* new_num_queues < old_num_queues */
1598 virtio_net_del_queue(n
, i
/ 2);
1601 for (i
= old_num_queues
- 1; i
< new_num_queues
- 1; i
+= 2) {
1602 /* new_num_queues > old_num_queues */
1603 virtio_net_add_queue(n
, i
/ 2);
1606 /* add ctrl_vq last */
1607 n
->ctrl_vq
= virtio_add_queue(vdev
, 64, virtio_net_handle_ctrl
);
1610 static void virtio_net_set_multiqueue(VirtIONet
*n
, int multiqueue
)
1612 int max
= multiqueue
? n
->max_queues
: 1;
1614 n
->multiqueue
= multiqueue
;
1615 virtio_net_change_num_queues(n
, max
);
1617 virtio_net_set_queues(n
);
1620 static int virtio_net_post_load_device(void *opaque
, int version_id
)
1622 VirtIONet
*n
= opaque
;
1623 VirtIODevice
*vdev
= VIRTIO_DEVICE(n
);
1626 virtio_net_set_mrg_rx_bufs(n
, n
->mergeable_rx_bufs
,
1627 virtio_vdev_has_feature(vdev
,
1628 VIRTIO_F_VERSION_1
));
1630 /* MAC_TABLE_ENTRIES may be different from the saved image */
1631 if (n
->mac_table
.in_use
> MAC_TABLE_ENTRIES
) {
1632 n
->mac_table
.in_use
= 0;
1635 if (!virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
)) {
1636 n
->curr_guest_offloads
= virtio_net_supported_guest_offloads(n
);
1639 if (peer_has_vnet_hdr(n
)) {
1640 virtio_net_apply_guest_offloads(n
);
1643 virtio_net_set_queues(n
);
1645 /* Find the first multicast entry in the saved MAC filter */
1646 for (i
= 0; i
< n
->mac_table
.in_use
; i
++) {
1647 if (n
->mac_table
.macs
[i
* ETH_ALEN
] & 1) {
1651 n
->mac_table
.first_multi
= i
;
1653 /* nc.link_down can't be migrated, so infer link_down according
1654 * to link status bit in n->status */
1655 link_down
= (n
->status
& VIRTIO_NET_S_LINK_UP
) == 0;
1656 for (i
= 0; i
< n
->max_queues
; i
++) {
1657 qemu_get_subqueue(n
->nic
, i
)->link_down
= link_down
;
1660 if (virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_GUEST_ANNOUNCE
) &&
1661 virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_CTRL_VQ
)) {
1662 n
->announce_counter
= SELF_ANNOUNCE_ROUNDS
;
1663 timer_mod(n
->announce_timer
, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL
));
1669 /* tx_waiting field of a VirtIONetQueue */
1670 static const VMStateDescription vmstate_virtio_net_queue_tx_waiting
= {
1671 .name
= "virtio-net-queue-tx_waiting",
1672 .fields
= (VMStateField
[]) {
1673 VMSTATE_UINT32(tx_waiting
, VirtIONetQueue
),
1674 VMSTATE_END_OF_LIST()
1678 static bool max_queues_gt_1(void *opaque
, int version_id
)
1680 return VIRTIO_NET(opaque
)->max_queues
> 1;
1683 static bool has_ctrl_guest_offloads(void *opaque
, int version_id
)
1685 return virtio_vdev_has_feature(VIRTIO_DEVICE(opaque
),
1686 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
);
1689 static bool mac_table_fits(void *opaque
, int version_id
)
1691 return VIRTIO_NET(opaque
)->mac_table
.in_use
<= MAC_TABLE_ENTRIES
;
1694 static bool mac_table_doesnt_fit(void *opaque
, int version_id
)
1696 return !mac_table_fits(opaque
, version_id
);
1699 /* This temporary type is shared by all the WITH_TMP methods
1700 * although only some fields are used by each.
1702 struct VirtIONetMigTmp
{
1704 VirtIONetQueue
*vqs_1
;
1705 uint16_t curr_queues_1
;
1707 uint32_t has_vnet_hdr
;
1710 /* The 2nd and subsequent tx_waiting flags are loaded later than
1711 * the 1st entry in the queues and only if there's more than one
1712 * entry. We use the tmp mechanism to calculate a temporary
1713 * pointer and count and also validate the count.
1716 static int virtio_net_tx_waiting_pre_save(void *opaque
)
1718 struct VirtIONetMigTmp
*tmp
= opaque
;
1720 tmp
->vqs_1
= tmp
->parent
->vqs
+ 1;
1721 tmp
->curr_queues_1
= tmp
->parent
->curr_queues
- 1;
1722 if (tmp
->parent
->curr_queues
== 0) {
1723 tmp
->curr_queues_1
= 0;
1729 static int virtio_net_tx_waiting_pre_load(void *opaque
)
1731 struct VirtIONetMigTmp
*tmp
= opaque
;
1733 /* Reuse the pointer setup from save */
1734 virtio_net_tx_waiting_pre_save(opaque
);
1736 if (tmp
->parent
->curr_queues
> tmp
->parent
->max_queues
) {
1737 error_report("virtio-net: curr_queues %x > max_queues %x",
1738 tmp
->parent
->curr_queues
, tmp
->parent
->max_queues
);
1743 return 0; /* all good */
1746 static const VMStateDescription vmstate_virtio_net_tx_waiting
= {
1747 .name
= "virtio-net-tx_waiting",
1748 .pre_load
= virtio_net_tx_waiting_pre_load
,
1749 .pre_save
= virtio_net_tx_waiting_pre_save
,
1750 .fields
= (VMStateField
[]) {
1751 VMSTATE_STRUCT_VARRAY_POINTER_UINT16(vqs_1
, struct VirtIONetMigTmp
,
1753 vmstate_virtio_net_queue_tx_waiting
,
1754 struct VirtIONetQueue
),
1755 VMSTATE_END_OF_LIST()
1759 /* the 'has_ufo' flag is just tested; if the incoming stream has the
1760 * flag set we need to check that we have it
1762 static int virtio_net_ufo_post_load(void *opaque
, int version_id
)
1764 struct VirtIONetMigTmp
*tmp
= opaque
;
1766 if (tmp
->has_ufo
&& !peer_has_ufo(tmp
->parent
)) {
1767 error_report("virtio-net: saved image requires TUN_F_UFO support");
1774 static int virtio_net_ufo_pre_save(void *opaque
)
1776 struct VirtIONetMigTmp
*tmp
= opaque
;
1778 tmp
->has_ufo
= tmp
->parent
->has_ufo
;
1783 static const VMStateDescription vmstate_virtio_net_has_ufo
= {
1784 .name
= "virtio-net-ufo",
1785 .post_load
= virtio_net_ufo_post_load
,
1786 .pre_save
= virtio_net_ufo_pre_save
,
1787 .fields
= (VMStateField
[]) {
1788 VMSTATE_UINT8(has_ufo
, struct VirtIONetMigTmp
),
1789 VMSTATE_END_OF_LIST()
1793 /* the 'has_vnet_hdr' flag is just tested; if the incoming stream has the
1794 * flag set we need to check that we have it
1796 static int virtio_net_vnet_post_load(void *opaque
, int version_id
)
1798 struct VirtIONetMigTmp
*tmp
= opaque
;
1800 if (tmp
->has_vnet_hdr
&& !peer_has_vnet_hdr(tmp
->parent
)) {
1801 error_report("virtio-net: saved image requires vnet_hdr=on");
1808 static int virtio_net_vnet_pre_save(void *opaque
)
1810 struct VirtIONetMigTmp
*tmp
= opaque
;
1812 tmp
->has_vnet_hdr
= tmp
->parent
->has_vnet_hdr
;
1817 static const VMStateDescription vmstate_virtio_net_has_vnet
= {
1818 .name
= "virtio-net-vnet",
1819 .post_load
= virtio_net_vnet_post_load
,
1820 .pre_save
= virtio_net_vnet_pre_save
,
1821 .fields
= (VMStateField
[]) {
1822 VMSTATE_UINT32(has_vnet_hdr
, struct VirtIONetMigTmp
),
1823 VMSTATE_END_OF_LIST()
1827 static const VMStateDescription vmstate_virtio_net_device
= {
1828 .name
= "virtio-net-device",
1829 .version_id
= VIRTIO_NET_VM_VERSION
,
1830 .minimum_version_id
= VIRTIO_NET_VM_VERSION
,
1831 .post_load
= virtio_net_post_load_device
,
1832 .fields
= (VMStateField
[]) {
1833 VMSTATE_UINT8_ARRAY(mac
, VirtIONet
, ETH_ALEN
),
1834 VMSTATE_STRUCT_POINTER(vqs
, VirtIONet
,
1835 vmstate_virtio_net_queue_tx_waiting
,
1837 VMSTATE_UINT32(mergeable_rx_bufs
, VirtIONet
),
1838 VMSTATE_UINT16(status
, VirtIONet
),
1839 VMSTATE_UINT8(promisc
, VirtIONet
),
1840 VMSTATE_UINT8(allmulti
, VirtIONet
),
1841 VMSTATE_UINT32(mac_table
.in_use
, VirtIONet
),
1843 /* Guarded pair: If it fits we load it, else we throw it away
1844 * - can happen if source has a larger MAC table.; post-load
1845 * sets flags in this case.
1847 VMSTATE_VBUFFER_MULTIPLY(mac_table
.macs
, VirtIONet
,
1848 0, mac_table_fits
, mac_table
.in_use
,
1850 VMSTATE_UNUSED_VARRAY_UINT32(VirtIONet
, mac_table_doesnt_fit
, 0,
1851 mac_table
.in_use
, ETH_ALEN
),
1853 /* Note: This is an array of uint32's that's always been saved as a
1854 * buffer; hold onto your endiannesses; it's actually used as a bitmap
1855 * but based on the uint.
1857 VMSTATE_BUFFER_POINTER_UNSAFE(vlans
, VirtIONet
, 0, MAX_VLAN
>> 3),
1858 VMSTATE_WITH_TMP(VirtIONet
, struct VirtIONetMigTmp
,
1859 vmstate_virtio_net_has_vnet
),
1860 VMSTATE_UINT8(mac_table
.multi_overflow
, VirtIONet
),
1861 VMSTATE_UINT8(mac_table
.uni_overflow
, VirtIONet
),
1862 VMSTATE_UINT8(alluni
, VirtIONet
),
1863 VMSTATE_UINT8(nomulti
, VirtIONet
),
1864 VMSTATE_UINT8(nouni
, VirtIONet
),
1865 VMSTATE_UINT8(nobcast
, VirtIONet
),
1866 VMSTATE_WITH_TMP(VirtIONet
, struct VirtIONetMigTmp
,
1867 vmstate_virtio_net_has_ufo
),
1868 VMSTATE_SINGLE_TEST(max_queues
, VirtIONet
, max_queues_gt_1
, 0,
1869 vmstate_info_uint16_equal
, uint16_t),
1870 VMSTATE_UINT16_TEST(curr_queues
, VirtIONet
, max_queues_gt_1
),
1871 VMSTATE_WITH_TMP(VirtIONet
, struct VirtIONetMigTmp
,
1872 vmstate_virtio_net_tx_waiting
),
1873 VMSTATE_UINT64_TEST(curr_guest_offloads
, VirtIONet
,
1874 has_ctrl_guest_offloads
),
1875 VMSTATE_END_OF_LIST()
1879 static NetClientInfo net_virtio_info
= {
1880 .type
= NET_CLIENT_DRIVER_NIC
,
1881 .size
= sizeof(NICState
),
1882 .can_receive
= virtio_net_can_receive
,
1883 .receive
= virtio_net_receive
,
1884 .link_status_changed
= virtio_net_set_link_status
,
1885 .query_rx_filter
= virtio_net_query_rxfilter
,
1888 static bool virtio_net_guest_notifier_pending(VirtIODevice
*vdev
, int idx
)
1890 VirtIONet
*n
= VIRTIO_NET(vdev
);
1891 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, vq2q(idx
));
1892 assert(n
->vhost_started
);
1893 return vhost_net_virtqueue_pending(get_vhost_net(nc
->peer
), idx
);
1896 static void virtio_net_guest_notifier_mask(VirtIODevice
*vdev
, int idx
,
1899 VirtIONet
*n
= VIRTIO_NET(vdev
);
1900 NetClientState
*nc
= qemu_get_subqueue(n
->nic
, vq2q(idx
));
1901 assert(n
->vhost_started
);
1902 vhost_net_virtqueue_mask(get_vhost_net(nc
->peer
),
1906 static void virtio_net_set_config_size(VirtIONet
*n
, uint64_t host_features
)
1908 int i
, config_size
= 0;
1909 virtio_add_feature(&host_features
, VIRTIO_NET_F_MAC
);
1911 for (i
= 0; feature_sizes
[i
].flags
!= 0; i
++) {
1912 if (host_features
& feature_sizes
[i
].flags
) {
1913 config_size
= MAX(feature_sizes
[i
].end
, config_size
);
1916 n
->config_size
= config_size
;
1919 void virtio_net_set_netclient_name(VirtIONet
*n
, const char *name
,
1923 * The name can be NULL, the netclient name will be type.x.
1925 assert(type
!= NULL
);
1927 g_free(n
->netclient_name
);
1928 g_free(n
->netclient_type
);
1929 n
->netclient_name
= g_strdup(name
);
1930 n
->netclient_type
= g_strdup(type
);
1933 static void virtio_net_device_realize(DeviceState
*dev
, Error
**errp
)
1935 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
1936 VirtIONet
*n
= VIRTIO_NET(dev
);
1940 if (n
->net_conf
.mtu
) {
1941 n
->host_features
|= (0x1 << VIRTIO_NET_F_MTU
);
1944 virtio_net_set_config_size(n
, n
->host_features
);
1945 virtio_init(vdev
, "virtio-net", VIRTIO_ID_NET
, n
->config_size
);
1948 * We set a lower limit on RX queue size to what it always was.
1949 * Guests that want a smaller ring can always resize it without
1950 * help from us (using virtio 1 and up).
1952 if (n
->net_conf
.rx_queue_size
< VIRTIO_NET_RX_QUEUE_MIN_SIZE
||
1953 n
->net_conf
.rx_queue_size
> VIRTQUEUE_MAX_SIZE
||
1954 !is_power_of_2(n
->net_conf
.rx_queue_size
)) {
1955 error_setg(errp
, "Invalid rx_queue_size (= %" PRIu16
"), "
1956 "must be a power of 2 between %d and %d.",
1957 n
->net_conf
.rx_queue_size
, VIRTIO_NET_RX_QUEUE_MIN_SIZE
,
1958 VIRTQUEUE_MAX_SIZE
);
1959 virtio_cleanup(vdev
);
1963 if (n
->net_conf
.tx_queue_size
< VIRTIO_NET_TX_QUEUE_MIN_SIZE
||
1964 n
->net_conf
.tx_queue_size
> VIRTQUEUE_MAX_SIZE
||
1965 !is_power_of_2(n
->net_conf
.tx_queue_size
)) {
1966 error_setg(errp
, "Invalid tx_queue_size (= %" PRIu16
"), "
1967 "must be a power of 2 between %d and %d",
1968 n
->net_conf
.tx_queue_size
, VIRTIO_NET_TX_QUEUE_MIN_SIZE
,
1969 VIRTQUEUE_MAX_SIZE
);
1970 virtio_cleanup(vdev
);
1974 n
->max_queues
= MAX(n
->nic_conf
.peers
.queues
, 1);
1975 if (n
->max_queues
* 2 + 1 > VIRTIO_QUEUE_MAX
) {
1976 error_setg(errp
, "Invalid number of queues (= %" PRIu32
"), "
1977 "must be a positive integer less than %d.",
1978 n
->max_queues
, (VIRTIO_QUEUE_MAX
- 1) / 2);
1979 virtio_cleanup(vdev
);
1982 n
->vqs
= g_malloc0(sizeof(VirtIONetQueue
) * n
->max_queues
);
1984 n
->tx_timeout
= n
->net_conf
.txtimer
;
1986 if (n
->net_conf
.tx
&& strcmp(n
->net_conf
.tx
, "timer")
1987 && strcmp(n
->net_conf
.tx
, "bh")) {
1988 error_report("virtio-net: "
1989 "Unknown option tx=%s, valid options: \"timer\" \"bh\"",
1991 error_report("Defaulting to \"bh\"");
1994 n
->net_conf
.tx_queue_size
= MIN(virtio_net_max_tx_queue_size(n
),
1995 n
->net_conf
.tx_queue_size
);
1997 for (i
= 0; i
< n
->max_queues
; i
++) {
1998 virtio_net_add_queue(n
, i
);
2001 n
->ctrl_vq
= virtio_add_queue(vdev
, 64, virtio_net_handle_ctrl
);
2002 qemu_macaddr_default_if_unset(&n
->nic_conf
.macaddr
);
2003 memcpy(&n
->mac
[0], &n
->nic_conf
.macaddr
, sizeof(n
->mac
));
2004 n
->status
= VIRTIO_NET_S_LINK_UP
;
2005 n
->announce_timer
= timer_new_ms(QEMU_CLOCK_VIRTUAL
,
2006 virtio_net_announce_timer
, n
);
2008 if (n
->netclient_type
) {
2010 * Happen when virtio_net_set_netclient_name has been called.
2012 n
->nic
= qemu_new_nic(&net_virtio_info
, &n
->nic_conf
,
2013 n
->netclient_type
, n
->netclient_name
, n
);
2015 n
->nic
= qemu_new_nic(&net_virtio_info
, &n
->nic_conf
,
2016 object_get_typename(OBJECT(dev
)), dev
->id
, n
);
2019 peer_test_vnet_hdr(n
);
2020 if (peer_has_vnet_hdr(n
)) {
2021 for (i
= 0; i
< n
->max_queues
; i
++) {
2022 qemu_using_vnet_hdr(qemu_get_subqueue(n
->nic
, i
)->peer
, true);
2024 n
->host_hdr_len
= sizeof(struct virtio_net_hdr
);
2026 n
->host_hdr_len
= 0;
2029 qemu_format_nic_info_str(qemu_get_queue(n
->nic
), n
->nic_conf
.macaddr
.a
);
2031 n
->vqs
[0].tx_waiting
= 0;
2032 n
->tx_burst
= n
->net_conf
.txburst
;
2033 virtio_net_set_mrg_rx_bufs(n
, 0, 0);
2034 n
->promisc
= 1; /* for compatibility */
2036 n
->mac_table
.macs
= g_malloc0(MAC_TABLE_ENTRIES
* ETH_ALEN
);
2038 n
->vlans
= g_malloc0(MAX_VLAN
>> 3);
2040 nc
= qemu_get_queue(n
->nic
);
2041 nc
->rxfilter_notify_enabled
= 1;
2046 static void virtio_net_device_unrealize(DeviceState
*dev
, Error
**errp
)
2048 VirtIODevice
*vdev
= VIRTIO_DEVICE(dev
);
2049 VirtIONet
*n
= VIRTIO_NET(dev
);
2052 /* This will stop vhost backend if appropriate. */
2053 virtio_net_set_status(vdev
, 0);
2055 g_free(n
->netclient_name
);
2056 n
->netclient_name
= NULL
;
2057 g_free(n
->netclient_type
);
2058 n
->netclient_type
= NULL
;
2060 g_free(n
->mac_table
.macs
);
2063 max_queues
= n
->multiqueue
? n
->max_queues
: 1;
2064 for (i
= 0; i
< max_queues
; i
++) {
2065 virtio_net_del_queue(n
, i
);
2068 timer_del(n
->announce_timer
);
2069 timer_free(n
->announce_timer
);
2071 qemu_del_nic(n
->nic
);
2072 virtio_cleanup(vdev
);
2075 static void virtio_net_instance_init(Object
*obj
)
2077 VirtIONet
*n
= VIRTIO_NET(obj
);
2080 * The default config_size is sizeof(struct virtio_net_config).
2081 * Can be overriden with virtio_net_set_config_size.
2083 n
->config_size
= sizeof(struct virtio_net_config
);
2084 device_add_bootindex_property(obj
, &n
->nic_conf
.bootindex
,
2085 "bootindex", "/ethernet-phy@0",
2089 static int virtio_net_pre_save(void *opaque
)
2091 VirtIONet
*n
= opaque
;
2093 /* At this point, backend must be stopped, otherwise
2094 * it might keep writing to memory. */
2095 assert(!n
->vhost_started
);
2100 static const VMStateDescription vmstate_virtio_net
= {
2101 .name
= "virtio-net",
2102 .minimum_version_id
= VIRTIO_NET_VM_VERSION
,
2103 .version_id
= VIRTIO_NET_VM_VERSION
,
2104 .fields
= (VMStateField
[]) {
2105 VMSTATE_VIRTIO_DEVICE
,
2106 VMSTATE_END_OF_LIST()
2108 .pre_save
= virtio_net_pre_save
,
2111 static Property virtio_net_properties
[] = {
2112 DEFINE_PROP_BIT("csum", VirtIONet
, host_features
, VIRTIO_NET_F_CSUM
, true),
2113 DEFINE_PROP_BIT("guest_csum", VirtIONet
, host_features
,
2114 VIRTIO_NET_F_GUEST_CSUM
, true),
2115 DEFINE_PROP_BIT("gso", VirtIONet
, host_features
, VIRTIO_NET_F_GSO
, true),
2116 DEFINE_PROP_BIT("guest_tso4", VirtIONet
, host_features
,
2117 VIRTIO_NET_F_GUEST_TSO4
, true),
2118 DEFINE_PROP_BIT("guest_tso6", VirtIONet
, host_features
,
2119 VIRTIO_NET_F_GUEST_TSO6
, true),
2120 DEFINE_PROP_BIT("guest_ecn", VirtIONet
, host_features
,
2121 VIRTIO_NET_F_GUEST_ECN
, true),
2122 DEFINE_PROP_BIT("guest_ufo", VirtIONet
, host_features
,
2123 VIRTIO_NET_F_GUEST_UFO
, true),
2124 DEFINE_PROP_BIT("guest_announce", VirtIONet
, host_features
,
2125 VIRTIO_NET_F_GUEST_ANNOUNCE
, true),
2126 DEFINE_PROP_BIT("host_tso4", VirtIONet
, host_features
,
2127 VIRTIO_NET_F_HOST_TSO4
, true),
2128 DEFINE_PROP_BIT("host_tso6", VirtIONet
, host_features
,
2129 VIRTIO_NET_F_HOST_TSO6
, true),
2130 DEFINE_PROP_BIT("host_ecn", VirtIONet
, host_features
,
2131 VIRTIO_NET_F_HOST_ECN
, true),
2132 DEFINE_PROP_BIT("host_ufo", VirtIONet
, host_features
,
2133 VIRTIO_NET_F_HOST_UFO
, true),
2134 DEFINE_PROP_BIT("mrg_rxbuf", VirtIONet
, host_features
,
2135 VIRTIO_NET_F_MRG_RXBUF
, true),
2136 DEFINE_PROP_BIT("status", VirtIONet
, host_features
,
2137 VIRTIO_NET_F_STATUS
, true),
2138 DEFINE_PROP_BIT("ctrl_vq", VirtIONet
, host_features
,
2139 VIRTIO_NET_F_CTRL_VQ
, true),
2140 DEFINE_PROP_BIT("ctrl_rx", VirtIONet
, host_features
,
2141 VIRTIO_NET_F_CTRL_RX
, true),
2142 DEFINE_PROP_BIT("ctrl_vlan", VirtIONet
, host_features
,
2143 VIRTIO_NET_F_CTRL_VLAN
, true),
2144 DEFINE_PROP_BIT("ctrl_rx_extra", VirtIONet
, host_features
,
2145 VIRTIO_NET_F_CTRL_RX_EXTRA
, true),
2146 DEFINE_PROP_BIT("ctrl_mac_addr", VirtIONet
, host_features
,
2147 VIRTIO_NET_F_CTRL_MAC_ADDR
, true),
2148 DEFINE_PROP_BIT("ctrl_guest_offloads", VirtIONet
, host_features
,
2149 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
, true),
2150 DEFINE_PROP_BIT("mq", VirtIONet
, host_features
, VIRTIO_NET_F_MQ
, false),
2151 DEFINE_NIC_PROPERTIES(VirtIONet
, nic_conf
),
2152 DEFINE_PROP_UINT32("x-txtimer", VirtIONet
, net_conf
.txtimer
,
2154 DEFINE_PROP_INT32("x-txburst", VirtIONet
, net_conf
.txburst
, TX_BURST
),
2155 DEFINE_PROP_STRING("tx", VirtIONet
, net_conf
.tx
),
2156 DEFINE_PROP_UINT16("rx_queue_size", VirtIONet
, net_conf
.rx_queue_size
,
2157 VIRTIO_NET_RX_QUEUE_DEFAULT_SIZE
),
2158 DEFINE_PROP_UINT16("tx_queue_size", VirtIONet
, net_conf
.tx_queue_size
,
2159 VIRTIO_NET_TX_QUEUE_DEFAULT_SIZE
),
2160 DEFINE_PROP_UINT16("host_mtu", VirtIONet
, net_conf
.mtu
, 0),
2161 DEFINE_PROP_BOOL("x-mtu-bypass-backend", VirtIONet
, mtu_bypass_backend
,
2163 DEFINE_PROP_END_OF_LIST(),
2166 static void virtio_net_class_init(ObjectClass
*klass
, void *data
)
2168 DeviceClass
*dc
= DEVICE_CLASS(klass
);
2169 VirtioDeviceClass
*vdc
= VIRTIO_DEVICE_CLASS(klass
);
2171 dc
->props
= virtio_net_properties
;
2172 dc
->vmsd
= &vmstate_virtio_net
;
2173 set_bit(DEVICE_CATEGORY_NETWORK
, dc
->categories
);
2174 vdc
->realize
= virtio_net_device_realize
;
2175 vdc
->unrealize
= virtio_net_device_unrealize
;
2176 vdc
->get_config
= virtio_net_get_config
;
2177 vdc
->set_config
= virtio_net_set_config
;
2178 vdc
->get_features
= virtio_net_get_features
;
2179 vdc
->set_features
= virtio_net_set_features
;
2180 vdc
->bad_features
= virtio_net_bad_features
;
2181 vdc
->reset
= virtio_net_reset
;
2182 vdc
->set_status
= virtio_net_set_status
;
2183 vdc
->guest_notifier_mask
= virtio_net_guest_notifier_mask
;
2184 vdc
->guest_notifier_pending
= virtio_net_guest_notifier_pending
;
2185 vdc
->legacy_features
|= (0x1 << VIRTIO_NET_F_GSO
);
2186 vdc
->vmsd
= &vmstate_virtio_net_device
;
2189 static const TypeInfo virtio_net_info
= {
2190 .name
= TYPE_VIRTIO_NET
,
2191 .parent
= TYPE_VIRTIO_DEVICE
,
2192 .instance_size
= sizeof(VirtIONet
),
2193 .instance_init
= virtio_net_instance_init
,
2194 .class_init
= virtio_net_class_init
,
2197 static void virtio_register_types(void)
2199 type_register_static(&virtio_net_info
);
2202 type_init(virtio_register_types
)