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ec57db1630
qemu/hw/net/virtio-net.c
Jason Wang ec57db1630 virtio-net: unbreak the minix guest 
Multiqueue patchset conditionally add control vq only when guest negotiate the
feature. Though the spec is not clear on this but it breaks the minix guest
since it will identify the ctrl vq even if it does not support it. Though this
behavior seems a violation on the spec "If the VIRTIO_NET_F_CTRL_VQ feature bit
is negotiated, identify the control virtqueue.", to keep the backward
compatibility, always add the ctrl vq at end of the queues.

Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-id: 1366874663-2566-1-git-send-email-jasowang@redhat.com
Cc: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-04-29 08:27:15 -05:00

1435 lines
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/*
* Virtio Network Device
*
* Copyright IBM, Corp. 2007
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include "qemu/iov.h"
#include "hw/virtio/virtio.h"
#include "net/net.h"
#include "net/checksum.h"
#include "net/tap.h"
#include "qemu/error-report.h"
#include "qemu/timer.h"
#include "hw/virtio/virtio-net.h"
#include "net/vhost_net.h"
#include "hw/virtio/virtio-bus.h"
#define VIRTIO_NET_VM_VERSION 11
#define MAC_TABLE_ENTRIES 64
#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
/*
* Calculate the number of bytes up to and including the given 'field' of
* 'container'.
*/
#define endof(container, field) \
(offsetof(container, field) + sizeof(((container *)0)->field))
typedef struct VirtIOFeature {
uint32_t flags;
size_t end;
} VirtIOFeature;
static VirtIOFeature feature_sizes[] = {
{.flags = 1 << VIRTIO_NET_F_MAC,
.end = endof(struct virtio_net_config, mac)},
{.flags = 1 << VIRTIO_NET_F_STATUS,
.end = endof(struct virtio_net_config, status)},
{.flags = 1 << VIRTIO_NET_F_MQ,
.end = endof(struct virtio_net_config, max_virtqueue_pairs)},
{}
};
static VirtIONetQueue *virtio_net_get_subqueue(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
return &n->vqs[nc->queue_index];
}
static int vq2q(int queue_index)
{
return queue_index / 2;
}
/* TODO
* - we could suppress RX interrupt if we were so inclined.
*/
static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg;
stw_p(&netcfg.status, n->status);
stw_p(&netcfg.max_virtqueue_pairs, n->max_queues);
memcpy(netcfg.mac, n->mac, ETH_ALEN);
memcpy(config, &netcfg, n->config_size);
}
static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg = {};
memcpy(&netcfg, config, n->config_size);
if (!(vdev->guest_features >> VIRTIO_NET_F_CTRL_MAC_ADDR & 1) &&
memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
memcpy(n->mac, netcfg.mac, ETH_ALEN);
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
}
}
static bool virtio_net_started(VirtIONet *n, uint8_t status)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
(n->status & VIRTIO_NET_S_LINK_UP) && vdev->vm_running;
}
static void virtio_net_vhost_status(VirtIONet *n, uint8_t status)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
NetClientState *nc = qemu_get_queue(n->nic);
int queues = n->multiqueue ? n->max_queues : 1;
if (!nc->peer) {
return;
}
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
return;
}
if (!tap_get_vhost_net(nc->peer)) {
return;
}
if (!!n->vhost_started == virtio_net_started(n, status) &&
!nc->peer->link_down) {
return;
}
if (!n->vhost_started) {
int r;
if (!vhost_net_query(tap_get_vhost_net(nc->peer), vdev)) {
return;
}
n->vhost_started = 1;
r = vhost_net_start(vdev, n->nic->ncs, queues);
if (r < 0) {
error_report("unable to start vhost net: %d: "
"falling back on userspace virtio", -r);
n->vhost_started = 0;
}
} else {
vhost_net_stop(vdev, n->nic->ncs, queues);
n->vhost_started = 0;
}
}
static void virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status)
{
VirtIONet *n = VIRTIO_NET(vdev);
VirtIONetQueue *q;
int i;
uint8_t queue_status;
virtio_net_vhost_status(n, status);
for (i = 0; i < n->max_queues; i++) {
q = &n->vqs[i];
if ((!n->multiqueue && i != 0) || i >= n->curr_queues) {
queue_status = 0;
} else {
queue_status = status;
}
if (!q->tx_waiting) {
continue;
}
if (virtio_net_started(n, queue_status) && !n->vhost_started) {
if (q->tx_timer) {
qemu_mod_timer(q->tx_timer,
qemu_get_clock_ns(vm_clock) + n->tx_timeout);
} else {
qemu_bh_schedule(q->tx_bh);
}
} else {
if (q->tx_timer) {
qemu_del_timer(q->tx_timer);
} else {
qemu_bh_cancel(q->tx_bh);
}
}
}
}
static void virtio_net_set_link_status(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
uint16_t old_status = n->status;
if (nc->link_down)
n->status &= ~VIRTIO_NET_S_LINK_UP;
else
n->status |= VIRTIO_NET_S_LINK_UP;
if (n->status != old_status)
virtio_notify_config(vdev);
virtio_net_set_status(vdev, vdev->status);
}
static void virtio_net_reset(VirtIODevice *vdev)
{
VirtIONet *n = VIRTIO_NET(vdev);
/* Reset back to compatibility mode */
n->promisc = 1;
n->allmulti = 0;
n->alluni = 0;
n->nomulti = 0;
n->nouni = 0;
n->nobcast = 0;
/* multiqueue is disabled by default */
n->curr_queues = 1;
/* Flush any MAC and VLAN filter table state */
n->mac_table.in_use = 0;
n->mac_table.first_multi = 0;
n->mac_table.multi_overflow = 0;
n->mac_table.uni_overflow = 0;
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
memcpy(&n->mac[0], &n->nic->conf->macaddr, sizeof(n->mac));
memset(n->vlans, 0, MAX_VLAN >> 3);
}
static void peer_test_vnet_hdr(VirtIONet *n)
{
NetClientState *nc = qemu_get_queue(n->nic);
if (!nc->peer) {
return;
}
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
return;
}
n->has_vnet_hdr = tap_has_vnet_hdr(nc->peer);
}
static int peer_has_vnet_hdr(VirtIONet *n)
{
return n->has_vnet_hdr;
}
static int peer_has_ufo(VirtIONet *n)
{
if (!peer_has_vnet_hdr(n))
return 0;
n->has_ufo = tap_has_ufo(qemu_get_queue(n->nic)->peer);
return n->has_ufo;
}
static void virtio_net_set_mrg_rx_bufs(VirtIONet *n, int mergeable_rx_bufs)
{
int i;
NetClientState *nc;
n->mergeable_rx_bufs = mergeable_rx_bufs;
n->guest_hdr_len = n->mergeable_rx_bufs ?
sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
for (i = 0; i < n->max_queues; i++) {
nc = qemu_get_subqueue(n->nic, i);
if (peer_has_vnet_hdr(n) &&
tap_has_vnet_hdr_len(nc->peer, n->guest_hdr_len)) {
tap_set_vnet_hdr_len(nc->peer, n->guest_hdr_len);
n->host_hdr_len = n->guest_hdr_len;
}
}
}
static int peer_attach(VirtIONet *n, int index)
{
NetClientState *nc = qemu_get_subqueue(n->nic, index);
if (!nc->peer) {
return 0;
}
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
return 0;
}
return tap_enable(nc->peer);
}
static int peer_detach(VirtIONet *n, int index)
{
NetClientState *nc = qemu_get_subqueue(n->nic, index);
if (!nc->peer) {
return 0;
}
if (nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
return 0;
}
return tap_disable(nc->peer);
}
static void virtio_net_set_queues(VirtIONet *n)
{
int i;
for (i = 0; i < n->max_queues; i++) {
if (i < n->curr_queues) {
assert(!peer_attach(n, i));
} else {
assert(!peer_detach(n, i));
}
}
}
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue);
static uint32_t virtio_net_get_features(VirtIODevice *vdev, uint32_t features)
{
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_queue(n->nic);
features |= (1 << VIRTIO_NET_F_MAC);
if (!peer_has_vnet_hdr(n)) {
features &= ~(0x1 << VIRTIO_NET_F_CSUM);
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO4);
features &= ~(0x1 << VIRTIO_NET_F_HOST_TSO6);
features &= ~(0x1 << VIRTIO_NET_F_HOST_ECN);
features &= ~(0x1 << VIRTIO_NET_F_GUEST_CSUM);
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO4);
features &= ~(0x1 << VIRTIO_NET_F_GUEST_TSO6);
features &= ~(0x1 << VIRTIO_NET_F_GUEST_ECN);
}
if (!peer_has_vnet_hdr(n) || !peer_has_ufo(n)) {
features &= ~(0x1 << VIRTIO_NET_F_GUEST_UFO);
features &= ~(0x1 << VIRTIO_NET_F_HOST_UFO);
}
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
return features;
}
if (!tap_get_vhost_net(nc->peer)) {
return features;
}
return vhost_net_get_features(tap_get_vhost_net(nc->peer), features);
}
static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
{
uint32_t features = 0;
/* Linux kernel 2.6.25. It understood MAC (as everyone must),
* but also these: */
features |= (1 << VIRTIO_NET_F_MAC);
features |= (1 << VIRTIO_NET_F_CSUM);
features |= (1 << VIRTIO_NET_F_HOST_TSO4);
features |= (1 << VIRTIO_NET_F_HOST_TSO6);
features |= (1 << VIRTIO_NET_F_HOST_ECN);
return features;
}
static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
{
VirtIONet *n = VIRTIO_NET(vdev);
int i;
virtio_net_set_multiqueue(n, !!(features & (1 << VIRTIO_NET_F_MQ)));
virtio_net_set_mrg_rx_bufs(n, !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF)));
if (n->has_vnet_hdr) {
tap_set_offload(qemu_get_subqueue(n->nic, 0)->peer,
(features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
(features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
(features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
(features >> VIRTIO_NET_F_GUEST_ECN) & 1,
(features >> VIRTIO_NET_F_GUEST_UFO) & 1);
}
for (i = 0; i < n->max_queues; i++) {
NetClientState *nc = qemu_get_subqueue(n->nic, i);
if (!nc->peer || nc->peer->info->type != NET_CLIENT_OPTIONS_KIND_TAP) {
continue;
}
if (!tap_get_vhost_net(nc->peer)) {
continue;
}
vhost_net_ack_features(tap_get_vhost_net(nc->peer), features);
}
}
static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
struct iovec *iov, unsigned int iov_cnt)
{
uint8_t on;
size_t s;
s = iov_to_buf(iov, iov_cnt, 0, &on, sizeof(on));
if (s != sizeof(on)) {
return VIRTIO_NET_ERR;
}
if (cmd == VIRTIO_NET_CTRL_RX_PROMISC) {
n->promisc = on;
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLMULTI) {
n->allmulti = on;
} else if (cmd == VIRTIO_NET_CTRL_RX_ALLUNI) {
n->alluni = on;
} else if (cmd == VIRTIO_NET_CTRL_RX_NOMULTI) {
n->nomulti = on;
} else if (cmd == VIRTIO_NET_CTRL_RX_NOUNI) {
n->nouni = on;
} else if (cmd == VIRTIO_NET_CTRL_RX_NOBCAST) {
n->nobcast = on;
} else {
return VIRTIO_NET_ERR;
}
return VIRTIO_NET_OK;
}
static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
struct iovec *iov, unsigned int iov_cnt)
{
struct virtio_net_ctrl_mac mac_data;
size_t s;
if (cmd == VIRTIO_NET_CTRL_MAC_ADDR_SET) {
if (iov_size(iov, iov_cnt) != sizeof(n->mac)) {
return VIRTIO_NET_ERR;
}
s = iov_to_buf(iov, iov_cnt, 0, &n->mac, sizeof(n->mac));
assert(s == sizeof(n->mac));
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
return VIRTIO_NET_OK;
}
if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET) {
return VIRTIO_NET_ERR;
}
n->mac_table.in_use = 0;
n->mac_table.first_multi = 0;
n->mac_table.uni_overflow = 0;
n->mac_table.multi_overflow = 0;
memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
sizeof(mac_data.entries));
mac_data.entries = ldl_p(&mac_data.entries);
if (s != sizeof(mac_data.entries)) {
return VIRTIO_NET_ERR;
}
iov_discard_front(&iov, &iov_cnt, s);
if (mac_data.entries * ETH_ALEN > iov_size(iov, iov_cnt)) {
return VIRTIO_NET_ERR;
}
if (mac_data.entries <= MAC_TABLE_ENTRIES) {
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
mac_data.entries * ETH_ALEN);
if (s != mac_data.entries * ETH_ALEN) {
return VIRTIO_NET_ERR;
}
n->mac_table.in_use += mac_data.entries;
} else {
n->mac_table.uni_overflow = 1;
}
iov_discard_front(&iov, &iov_cnt, mac_data.entries * ETH_ALEN);
n->mac_table.first_multi = n->mac_table.in_use;
s = iov_to_buf(iov, iov_cnt, 0, &mac_data.entries,
sizeof(mac_data.entries));
mac_data.entries = ldl_p(&mac_data.entries);
if (s != sizeof(mac_data.entries)) {
return VIRTIO_NET_ERR;
}
iov_discard_front(&iov, &iov_cnt, s);
if (mac_data.entries * ETH_ALEN != iov_size(iov, iov_cnt)) {
return VIRTIO_NET_ERR;
}
if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
s = iov_to_buf(iov, iov_cnt, 0, n->mac_table.macs,
mac_data.entries * ETH_ALEN);
if (s != mac_data.entries * ETH_ALEN) {
return VIRTIO_NET_ERR;
}
n->mac_table.in_use += mac_data.entries;
} else {
n->mac_table.multi_overflow = 1;
}
return VIRTIO_NET_OK;
}
static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
struct iovec *iov, unsigned int iov_cnt)
{
uint16_t vid;
size_t s;
s = iov_to_buf(iov, iov_cnt, 0, &vid, sizeof(vid));
vid = lduw_p(&vid);
if (s != sizeof(vid)) {
return VIRTIO_NET_ERR;
}
if (vid >= MAX_VLAN)
return VIRTIO_NET_ERR;
if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
else
return VIRTIO_NET_ERR;
return VIRTIO_NET_OK;
}
static int virtio_net_handle_mq(VirtIONet *n, uint8_t cmd,
struct iovec *iov, unsigned int iov_cnt)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
struct virtio_net_ctrl_mq mq;
size_t s;
uint16_t queues;
s = iov_to_buf(iov, iov_cnt, 0, &mq, sizeof(mq));
if (s != sizeof(mq)) {
return VIRTIO_NET_ERR;
}
if (cmd != VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET) {
return VIRTIO_NET_ERR;
}
queues = lduw_p(&mq.virtqueue_pairs);
if (queues < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN ||
queues > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX ||
queues > n->max_queues ||
!n->multiqueue) {
return VIRTIO_NET_ERR;
}
n->curr_queues = queues;
/* stop the backend before changing the number of queues to avoid handling a
* disabled queue */
virtio_net_set_status(vdev, vdev->status);
virtio_net_set_queues(n);
return VIRTIO_NET_OK;
}
static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_ctrl_hdr ctrl;
virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
VirtQueueElement elem;
size_t s;
struct iovec *iov;
unsigned int iov_cnt;
while (virtqueue_pop(vq, &elem)) {
if (iov_size(elem.in_sg, elem.in_num) < sizeof(status) ||
iov_size(elem.out_sg, elem.out_num) < sizeof(ctrl)) {
error_report("virtio-net ctrl missing headers");
exit(1);
}
iov = elem.out_sg;
iov_cnt = elem.out_num;
s = iov_to_buf(iov, iov_cnt, 0, &ctrl, sizeof(ctrl));
iov_discard_front(&iov, &iov_cnt, sizeof(ctrl));
if (s != sizeof(ctrl)) {
status = VIRTIO_NET_ERR;
} else if (ctrl.class == VIRTIO_NET_CTRL_RX) {
status = virtio_net_handle_rx_mode(n, ctrl.cmd, iov, iov_cnt);
} else if (ctrl.class == VIRTIO_NET_CTRL_MAC) {
status = virtio_net_handle_mac(n, ctrl.cmd, iov, iov_cnt);
} else if (ctrl.class == VIRTIO_NET_CTRL_VLAN) {
status = virtio_net_handle_vlan_table(n, ctrl.cmd, iov, iov_cnt);
} else if (ctrl.class == VIRTIO_NET_CTRL_MQ) {
status = virtio_net_handle_mq(n, ctrl.cmd, iov, iov_cnt);
}
s = iov_from_buf(elem.in_sg, elem.in_num, 0, &status, sizeof(status));
assert(s == sizeof(status));
virtqueue_push(vq, &elem, sizeof(status));
virtio_notify(vdev, vq);
}
}
/* RX */
static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = VIRTIO_NET(vdev);
int queue_index = vq2q(virtio_get_queue_index(vq));
qemu_flush_queued_packets(qemu_get_subqueue(n->nic, queue_index));
}
static int virtio_net_can_receive(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
if (!vdev->vm_running) {
return 0;
}
if (nc->queue_index >= n->curr_queues) {
return 0;
}
if (!virtio_queue_ready(q->rx_vq) ||
!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return 0;
}
return 1;
}
static int virtio_net_has_buffers(VirtIONetQueue *q, int bufsize)
{
VirtIONet *n = q->n;
if (virtio_queue_empty(q->rx_vq) ||
(n->mergeable_rx_bufs &&
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
virtio_queue_set_notification(q->rx_vq, 1);
/* To avoid a race condition where the guest has made some buffers
* available after the above check but before notification was
* enabled, check for available buffers again.
*/
if (virtio_queue_empty(q->rx_vq) ||
(n->mergeable_rx_bufs &&
!virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) {
return 0;
}
}
virtio_queue_set_notification(q->rx_vq, 0);
return 1;
}
/* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
* it never finds out that the packets don't have valid checksums. This
* causes dhclient to get upset. Fedora's carried a patch for ages to
* fix this with Xen but it hasn't appeared in an upstream release of
* dhclient yet.
*
* To avoid breaking existing guests, we catch udp packets and add
* checksums. This is terrible but it's better than hacking the guest
* kernels.
*
* N.B. if we introduce a zero-copy API, this operation is no longer free so
* we should provide a mechanism to disable it to avoid polluting the host
* cache.
*/
static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
uint8_t *buf, size_t size)
{
if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
(size > 27 && size < 1500) && /* normal sized MTU */
(buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
(buf[23] == 17) && /* ip.protocol == UDP */
(buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
net_checksum_calculate(buf, size);
hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
}
}
static void receive_header(VirtIONet *n, const struct iovec *iov, int iov_cnt,
const void *buf, size_t size)
{
if (n->has_vnet_hdr) {
/* FIXME this cast is evil */
void *wbuf = (void *)buf;
work_around_broken_dhclient(wbuf, wbuf + n->host_hdr_len,
size - n->host_hdr_len);
iov_from_buf(iov, iov_cnt, 0, buf, sizeof(struct virtio_net_hdr));
} else {
struct virtio_net_hdr hdr = {
.flags = 0,
.gso_type = VIRTIO_NET_HDR_GSO_NONE
};
iov_from_buf(iov, iov_cnt, 0, &hdr, sizeof hdr);
}
}
static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
{
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static const uint8_t vlan[] = {0x81, 0x00};
uint8_t *ptr = (uint8_t *)buf;
int i;
if (n->promisc)
return 1;
ptr += n->host_hdr_len;
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
return 0;
}
if (ptr[0] & 1) { // multicast
if (!memcmp(ptr, bcast, sizeof(bcast))) {
return !n->nobcast;
} else if (n->nomulti) {
return 0;
} else if (n->allmulti || n->mac_table.multi_overflow) {
return 1;
}
for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
return 1;
}
}
} else { // unicast
if (n->nouni) {
return 0;
} else if (n->alluni || n->mac_table.uni_overflow) {
return 1;
} else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
return 1;
}
for (i = 0; i < n->mac_table.first_multi; i++) {
if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
return 1;
}
}
}
return 0;
}
static ssize_t virtio_net_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
struct iovec mhdr_sg[VIRTQUEUE_MAX_SIZE];
struct virtio_net_hdr_mrg_rxbuf mhdr;
unsigned mhdr_cnt = 0;
size_t offset, i, guest_offset;
if (!virtio_net_can_receive(nc)) {
return -1;
}
/* hdr_len refers to the header we supply to the guest */
if (!virtio_net_has_buffers(q, size + n->guest_hdr_len - n->host_hdr_len)) {
return 0;
}
if (!receive_filter(n, buf, size))
return size;
offset = i = 0;
while (offset < size) {
VirtQueueElement elem;
int len, total;
const struct iovec *sg = elem.in_sg;
total = 0;
if (virtqueue_pop(q->rx_vq, &elem) == 0) {
if (i == 0)
return -1;
error_report("virtio-net unexpected empty queue: "
"i %zd mergeable %d offset %zd, size %zd, "
"guest hdr len %zd, host hdr len %zd guest features 0x%x",
i, n->mergeable_rx_bufs, offset, size,
n->guest_hdr_len, n->host_hdr_len, vdev->guest_features);
exit(1);
}
if (elem.in_num < 1) {
error_report("virtio-net receive queue contains no in buffers");
exit(1);
}
if (i == 0) {
assert(offset == 0);
if (n->mergeable_rx_bufs) {
mhdr_cnt = iov_copy(mhdr_sg, ARRAY_SIZE(mhdr_sg),
sg, elem.in_num,
offsetof(typeof(mhdr), num_buffers),
sizeof(mhdr.num_buffers));
}
receive_header(n, sg, elem.in_num, buf, size);
offset = n->host_hdr_len;
total += n->guest_hdr_len;
guest_offset = n->guest_hdr_len;
} else {
guest_offset = 0;
}
/* copy in packet. ugh */
len = iov_from_buf(sg, elem.in_num, guest_offset,
buf + offset, size - offset);
total += len;
offset += len;
/* If buffers can't be merged, at this point we
* must have consumed the complete packet.
* Otherwise, drop it. */
if (!n->mergeable_rx_bufs && offset < size) {
#if 0
error_report("virtio-net truncated non-mergeable packet: "
"i %zd mergeable %d offset %zd, size %zd, "
"guest hdr len %zd, host hdr len %zd",
i, n->mergeable_rx_bufs,
offset, size, n->guest_hdr_len, n->host_hdr_len);
#endif
return size;
}
/* signal other side */
virtqueue_fill(q->rx_vq, &elem, total, i++);
}
if (mhdr_cnt) {
stw_p(&mhdr.num_buffers, i);
iov_from_buf(mhdr_sg, mhdr_cnt,
0,
&mhdr.num_buffers, sizeof mhdr.num_buffers);
}
virtqueue_flush(q->rx_vq, i);
virtio_notify(vdev, q->rx_vq);
return size;
}
static int32_t virtio_net_flush_tx(VirtIONetQueue *q);
static void virtio_net_tx_complete(NetClientState *nc, ssize_t len)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
VirtIONetQueue *q = virtio_net_get_subqueue(nc);
VirtIODevice *vdev = VIRTIO_DEVICE(n);
virtqueue_push(q->tx_vq, &q->async_tx.elem, 0);
virtio_notify(vdev, q->tx_vq);
q->async_tx.elem.out_num = q->async_tx.len = 0;
virtio_queue_set_notification(q->tx_vq, 1);
virtio_net_flush_tx(q);
}
/* TX */
static int32_t virtio_net_flush_tx(VirtIONetQueue *q)
{
VirtIONet *n = q->n;
VirtIODevice *vdev = VIRTIO_DEVICE(n);
VirtQueueElement elem;
int32_t num_packets = 0;
int queue_index = vq2q(virtio_get_queue_index(q->tx_vq));
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return num_packets;
}
assert(vdev->vm_running);
if (q->async_tx.elem.out_num) {
virtio_queue_set_notification(q->tx_vq, 0);
return num_packets;
}
while (virtqueue_pop(q->tx_vq, &elem)) {
ssize_t ret, len;
unsigned int out_num = elem.out_num;
struct iovec *out_sg = &elem.out_sg[0];
struct iovec sg[VIRTQUEUE_MAX_SIZE];
if (out_num < 1) {
error_report("virtio-net header not in first element");
exit(1);
}
/*
* If host wants to see the guest header as is, we can
* pass it on unchanged. Otherwise, copy just the parts
* that host is interested in.
*/
assert(n->host_hdr_len <= n->guest_hdr_len);
if (n->host_hdr_len != n->guest_hdr_len) {
unsigned sg_num = iov_copy(sg, ARRAY_SIZE(sg),
out_sg, out_num,
0, n->host_hdr_len);
sg_num += iov_copy(sg + sg_num, ARRAY_SIZE(sg) - sg_num,
out_sg, out_num,
n->guest_hdr_len, -1);
out_num = sg_num;
out_sg = sg;
}
len = n->guest_hdr_len;
ret = qemu_sendv_packet_async(qemu_get_subqueue(n->nic, queue_index),
out_sg, out_num, virtio_net_tx_complete);
if (ret == 0) {
virtio_queue_set_notification(q->tx_vq, 0);
q->async_tx.elem = elem;
q->async_tx.len = len;
return -EBUSY;
}
len += ret;
virtqueue_push(q->tx_vq, &elem, 0);
virtio_notify(vdev, q->tx_vq);
if (++num_packets >= n->tx_burst) {
break;
}
}
return num_packets;
}
static void virtio_net_handle_tx_timer(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = VIRTIO_NET(vdev);
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
/* This happens when device was stopped but VCPU wasn't. */
if (!vdev->vm_running) {
q->tx_waiting = 1;
return;
}
if (q->tx_waiting) {
virtio_queue_set_notification(vq, 1);
qemu_del_timer(q->tx_timer);
q->tx_waiting = 0;
virtio_net_flush_tx(q);
} else {
qemu_mod_timer(q->tx_timer,
qemu_get_clock_ns(vm_clock) + n->tx_timeout);
q->tx_waiting = 1;
virtio_queue_set_notification(vq, 0);
}
}
static void virtio_net_handle_tx_bh(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIONet *n = VIRTIO_NET(vdev);
VirtIONetQueue *q = &n->vqs[vq2q(virtio_get_queue_index(vq))];
if (unlikely(q->tx_waiting)) {
return;
}
q->tx_waiting = 1;
/* This happens when device was stopped but VCPU wasn't. */
if (!vdev->vm_running) {
return;
}
virtio_queue_set_notification(vq, 0);
qemu_bh_schedule(q->tx_bh);
}
static void virtio_net_tx_timer(void *opaque)
{
VirtIONetQueue *q = opaque;
VirtIONet *n = q->n;
VirtIODevice *vdev = VIRTIO_DEVICE(n);
assert(vdev->vm_running);
q->tx_waiting = 0;
/* Just in case the driver is not ready on more */
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
return;
}
virtio_queue_set_notification(q->tx_vq, 1);
virtio_net_flush_tx(q);
}
static void virtio_net_tx_bh(void *opaque)
{
VirtIONetQueue *q = opaque;
VirtIONet *n = q->n;
VirtIODevice *vdev = VIRTIO_DEVICE(n);
int32_t ret;
assert(vdev->vm_running);
q->tx_waiting = 0;
/* Just in case the driver is not ready on more */
if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
return;
}
ret = virtio_net_flush_tx(q);
if (ret == -EBUSY) {
return; /* Notification re-enable handled by tx_complete */
}
/* If we flush a full burst of packets, assume there are
* more coming and immediately reschedule */
if (ret >= n->tx_burst) {
qemu_bh_schedule(q->tx_bh);
q->tx_waiting = 1;
return;
}
/* If less than a full burst, re-enable notification and flush
* anything that may have come in while we weren't looking. If
* we find something, assume the guest is still active and reschedule */
virtio_queue_set_notification(q->tx_vq, 1);
if (virtio_net_flush_tx(q) > 0) {
virtio_queue_set_notification(q->tx_vq, 0);
qemu_bh_schedule(q->tx_bh);
q->tx_waiting = 1;
}
}
static void virtio_net_set_multiqueue(VirtIONet *n, int multiqueue)
{
VirtIODevice *vdev = VIRTIO_DEVICE(n);
int i, max = multiqueue ? n->max_queues : 1;
n->multiqueue = multiqueue;
for (i = 2; i <= n->max_queues * 2 + 1; i++) {
virtio_del_queue(vdev, i);
}
for (i = 1; i < max; i++) {
n->vqs[i].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
if (n->vqs[i].tx_timer) {
n->vqs[i].tx_vq =
virtio_add_queue(vdev, 256, virtio_net_handle_tx_timer);
n->vqs[i].tx_timer = qemu_new_timer_ns(vm_clock,
virtio_net_tx_timer,
&n->vqs[i]);
} else {
n->vqs[i].tx_vq =
virtio_add_queue(vdev, 256, virtio_net_handle_tx_bh);
n->vqs[i].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[i]);
}
n->vqs[i].tx_waiting = 0;
n->vqs[i].n = n;
}
/* Note: Minux Guests (version 3.2.1) use ctrl vq but don't ack
* VIRTIO_NET_F_CTRL_VQ. Create ctrl vq unconditionally to avoid
* breaking them.
*/
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
virtio_net_set_queues(n);
}
static void virtio_net_save(QEMUFile *f, void *opaque)
{
int i;
VirtIONet *n = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(n);
/* At this point, backend must be stopped, otherwise
* it might keep writing to memory. */
assert(!n->vhost_started);
virtio_save(vdev, f);
qemu_put_buffer(f, n->mac, ETH_ALEN);
qemu_put_be32(f, n->vqs[0].tx_waiting);
qemu_put_be32(f, n->mergeable_rx_bufs);
qemu_put_be16(f, n->status);
qemu_put_byte(f, n->promisc);
qemu_put_byte(f, n->allmulti);
qemu_put_be32(f, n->mac_table.in_use);
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
qemu_put_be32(f, n->has_vnet_hdr);
qemu_put_byte(f, n->mac_table.multi_overflow);
qemu_put_byte(f, n->mac_table.uni_overflow);
qemu_put_byte(f, n->alluni);
qemu_put_byte(f, n->nomulti);
qemu_put_byte(f, n->nouni);
qemu_put_byte(f, n->nobcast);
qemu_put_byte(f, n->has_ufo);
if (n->max_queues > 1) {
qemu_put_be16(f, n->max_queues);
qemu_put_be16(f, n->curr_queues);
for (i = 1; i < n->curr_queues; i++) {
qemu_put_be32(f, n->vqs[i].tx_waiting);
}
}
}
static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
VirtIONet *n = opaque;
VirtIODevice *vdev = VIRTIO_DEVICE(n);
int ret, i, link_down;
if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
return -EINVAL;
ret = virtio_load(vdev, f);
if (ret) {
return ret;
}
qemu_get_buffer(f, n->mac, ETH_ALEN);
n->vqs[0].tx_waiting = qemu_get_be32(f);
virtio_net_set_mrg_rx_bufs(n, qemu_get_be32(f));
if (version_id >= 3)
n->status = qemu_get_be16(f);
if (version_id >= 4) {
if (version_id < 8) {
n->promisc = qemu_get_be32(f);
n->allmulti = qemu_get_be32(f);
} else {
n->promisc = qemu_get_byte(f);
n->allmulti = qemu_get_byte(f);
}
}
if (version_id >= 5) {
n->mac_table.in_use = qemu_get_be32(f);
/* MAC_TABLE_ENTRIES may be different from the saved image */
if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
qemu_get_buffer(f, n->mac_table.macs,
n->mac_table.in_use * ETH_ALEN);
} else if (n->mac_table.in_use) {
uint8_t *buf = g_malloc0(n->mac_table.in_use);
qemu_get_buffer(f, buf, n->mac_table.in_use * ETH_ALEN);
g_free(buf);
n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
n->mac_table.in_use = 0;
}
}
if (version_id >= 6)
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
if (version_id >= 7) {
if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
error_report("virtio-net: saved image requires vnet_hdr=on");
return -1;
}
if (n->has_vnet_hdr) {
tap_set_offload(qemu_get_queue(n->nic)->peer,
(vdev->guest_features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
(vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
(vdev->guest_features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
(vdev->guest_features >> VIRTIO_NET_F_GUEST_ECN) & 1,
(vdev->guest_features >> VIRTIO_NET_F_GUEST_UFO) & 1);
}
}
if (version_id >= 9) {
n->mac_table.multi_overflow = qemu_get_byte(f);
n->mac_table.uni_overflow = qemu_get_byte(f);
}
if (version_id >= 10) {
n->alluni = qemu_get_byte(f);
n->nomulti = qemu_get_byte(f);
n->nouni = qemu_get_byte(f);
n->nobcast = qemu_get_byte(f);
}
if (version_id >= 11) {
if (qemu_get_byte(f) && !peer_has_ufo(n)) {
error_report("virtio-net: saved image requires TUN_F_UFO support");
return -1;
}
}
if (n->max_queues > 1) {
if (n->max_queues != qemu_get_be16(f)) {
error_report("virtio-net: different max_queues ");
return -1;
}
n->curr_queues = qemu_get_be16(f);
for (i = 1; i < n->curr_queues; i++) {
n->vqs[i].tx_waiting = qemu_get_be32(f);
}
}
virtio_net_set_queues(n);
/* Find the first multicast entry in the saved MAC filter */
for (i = 0; i < n->mac_table.in_use; i++) {
if (n->mac_table.macs[i * ETH_ALEN] & 1) {
break;
}
}
n->mac_table.first_multi = i;
/* nc.link_down can't be migrated, so infer link_down according
* to link status bit in n->status */
link_down = (n->status & VIRTIO_NET_S_LINK_UP) == 0;
for (i = 0; i < n->max_queues; i++) {
qemu_get_subqueue(n->nic, i)->link_down = link_down;
}
return 0;
}
static void virtio_net_cleanup(NetClientState *nc)
{
VirtIONet *n = qemu_get_nic_opaque(nc);
n->nic = NULL;
}
static NetClientInfo net_virtio_info = {
.type = NET_CLIENT_OPTIONS_KIND_NIC,
.size = sizeof(NICState),
.can_receive = virtio_net_can_receive,
.receive = virtio_net_receive,
.cleanup = virtio_net_cleanup,
.link_status_changed = virtio_net_set_link_status,
};
static bool virtio_net_guest_notifier_pending(VirtIODevice *vdev, int idx)
{
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
assert(n->vhost_started);
return vhost_net_virtqueue_pending(tap_get_vhost_net(nc->peer), idx);
}
static void virtio_net_guest_notifier_mask(VirtIODevice *vdev, int idx,
bool mask)
{
VirtIONet *n = VIRTIO_NET(vdev);
NetClientState *nc = qemu_get_subqueue(n->nic, vq2q(idx));
assert(n->vhost_started);
vhost_net_virtqueue_mask(tap_get_vhost_net(nc->peer),
vdev, idx, mask);
}
void virtio_net_set_config_size(VirtIONet *n, uint32_t host_features)
{
int i, config_size = 0;
for (i = 0; feature_sizes[i].flags != 0; i++) {
if (host_features & feature_sizes[i].flags) {
config_size = MAX(feature_sizes[i].end, config_size);
}
}
n->config_size = config_size;
}
static int virtio_net_device_init(VirtIODevice *vdev)
{
int i;
DeviceState *qdev = DEVICE(vdev);
VirtIONet *n = VIRTIO_NET(vdev);
virtio_init(VIRTIO_DEVICE(n), "virtio-net", VIRTIO_ID_NET,
n->config_size);
n->max_queues = MAX(n->nic_conf.queues, 1);
n->vqs = g_malloc0(sizeof(VirtIONetQueue) * n->max_queues);
n->vqs[0].rx_vq = virtio_add_queue(vdev, 256, virtio_net_handle_rx);
n->curr_queues = 1;
n->vqs[0].n = n;
n->tx_timeout = n->net_conf.txtimer;
if (n->net_conf.tx && strcmp(n->net_conf.tx, "timer")
&& strcmp(n->net_conf.tx, "bh")) {
error_report("virtio-net: "
"Unknown option tx=%s, valid options: \"timer\" \"bh\"",
n->net_conf.tx);
error_report("Defaulting to \"bh\"");
}
if (n->net_conf.tx && !strcmp(n->net_conf.tx, "timer")) {
n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
virtio_net_handle_tx_timer);
n->vqs[0].tx_timer = qemu_new_timer_ns(vm_clock, virtio_net_tx_timer,
&n->vqs[0]);
} else {
n->vqs[0].tx_vq = virtio_add_queue(vdev, 256,
virtio_net_handle_tx_bh);
n->vqs[0].tx_bh = qemu_bh_new(virtio_net_tx_bh, &n->vqs[0]);
}
n->ctrl_vq = virtio_add_queue(vdev, 64, virtio_net_handle_ctrl);
qemu_macaddr_default_if_unset(&n->nic_conf.macaddr);
memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
n->status = VIRTIO_NET_S_LINK_UP;
n->nic = qemu_new_nic(&net_virtio_info, &n->nic_conf,
object_get_typename(OBJECT(qdev)), qdev->id, n);
peer_test_vnet_hdr(n);
if (peer_has_vnet_hdr(n)) {
for (i = 0; i < n->max_queues; i++) {
tap_using_vnet_hdr(qemu_get_subqueue(n->nic, i)->peer, true);
}
n->host_hdr_len = sizeof(struct virtio_net_hdr);
} else {
n->host_hdr_len = 0;
}
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->nic_conf.macaddr.a);
n->vqs[0].tx_waiting = 0;
n->tx_burst = n->net_conf.txburst;
virtio_net_set_mrg_rx_bufs(n, 0);
n->promisc = 1; /* for compatibility */
n->mac_table.macs = g_malloc0(MAC_TABLE_ENTRIES * ETH_ALEN);
n->vlans = g_malloc0(MAX_VLAN >> 3);
n->qdev = qdev;
register_savevm(qdev, "virtio-net", -1, VIRTIO_NET_VM_VERSION,
virtio_net_save, virtio_net_load, n);
add_boot_device_path(n->nic_conf.bootindex, qdev, "/ethernet-phy@0");
return 0;
}
static int virtio_net_device_exit(DeviceState *qdev)
{
VirtIONet *n = VIRTIO_NET(qdev);
VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
int i;
/* This will stop vhost backend if appropriate. */
virtio_net_set_status(vdev, 0);
unregister_savevm(qdev, "virtio-net", n);
g_free(n->mac_table.macs);
g_free(n->vlans);
for (i = 0; i < n->max_queues; i++) {
VirtIONetQueue *q = &n->vqs[i];
NetClientState *nc = qemu_get_subqueue(n->nic, i);
qemu_purge_queued_packets(nc);
if (q->tx_timer) {
qemu_del_timer(q->tx_timer);
qemu_free_timer(q->tx_timer);
} else {
qemu_bh_delete(q->tx_bh);
}
}
g_free(n->vqs);
qemu_del_nic(n->nic);
virtio_cleanup(vdev);
return 0;
}
static void virtio_net_instance_init(Object *obj)
{
VirtIONet *n = VIRTIO_NET(obj);
/*
* The default config_size is sizeof(struct virtio_net_config).
* Can be overriden with virtio_net_set_config_size.
*/
n->config_size = sizeof(struct virtio_net_config);
}
static Property virtio_net_properties[] = {
DEFINE_NIC_PROPERTIES(VirtIONet, nic_conf),
DEFINE_PROP_UINT32("x-txtimer", VirtIONet, net_conf.txtimer,
TX_TIMER_INTERVAL),
DEFINE_PROP_INT32("x-txburst", VirtIONet, net_conf.txburst, TX_BURST),
DEFINE_PROP_STRING("tx", VirtIONet, net_conf.tx),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_net_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
dc->exit = virtio_net_device_exit;
dc->props = virtio_net_properties;
vdc->init = virtio_net_device_init;
vdc->get_config = virtio_net_get_config;
vdc->set_config = virtio_net_set_config;
vdc->get_features = virtio_net_get_features;
vdc->set_features = virtio_net_set_features;
vdc->bad_features = virtio_net_bad_features;
vdc->reset = virtio_net_reset;
vdc->set_status = virtio_net_set_status;
vdc->guest_notifier_mask = virtio_net_guest_notifier_mask;
vdc->guest_notifier_pending = virtio_net_guest_notifier_pending;
}
static const TypeInfo virtio_net_info = {
.name = TYPE_VIRTIO_NET,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VirtIONet),
.instance_init = virtio_net_instance_init,
.class_init = virtio_net_class_init,
};
static void virtio_register_types(void)
{
type_register_static(&virtio_net_info);
}
type_init(virtio_register_types)
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