[thirdparty/qemu.git] / hw / virtio-net.c

/*
 * 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 "virtio.h"
#include "net.h"
#include "qemu-timer.h"
#include "virtio-net.h"

#define VIRTIO_NET_VM_VERSION    3

typedef struct VirtIONet
{
    VirtIODevice vdev;
    uint8_t mac[6];
    uint16_t status;
    VirtQueue *rx_vq;
    VirtQueue *tx_vq;
    VLANClientState *vc;
    QEMUTimer *tx_timer;
    int tx_timer_active;
    int mergeable_rx_bufs;
} VirtIONet;

/* TODO
 * - we could suppress RX interrupt if we were so inclined.
 */

static VirtIONet *to_virtio_net(VirtIODevice *vdev)
{
    return (VirtIONet *)vdev;
}

static void virtio_net_update_config(VirtIODevice *vdev, uint8_t *config)
{
    VirtIONet *n = to_virtio_net(vdev);
    struct virtio_net_config netcfg;

    netcfg.status = n->status;
    memcpy(netcfg.mac, n->mac, 6);
    memcpy(config, &netcfg, sizeof(netcfg));
}

static void virtio_net_set_link_status(VLANClientState *vc)
{
    VirtIONet *n = vc->opaque;
    uint16_t old_status = n->status;

    if (vc->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(&n->vdev);
}

static uint32_t virtio_net_get_features(VirtIODevice *vdev)
{
    uint32_t features = (1 << VIRTIO_NET_F_MAC) | (1 << VIRTIO_NET_F_STATUS);

    return features;
}

static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
{
    VirtIONet *n = to_virtio_net(vdev);

    n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
}

/* RX */

static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
{
}

static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
{
    if (!virtio_queue_ready(n->rx_vq) ||
        !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
        return 0;

    if (virtio_queue_empty(n->rx_vq) ||
        (n->mergeable_rx_bufs &&
         !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
        virtio_queue_set_notification(n->rx_vq, 1);
        return 0;
    }

    virtio_queue_set_notification(n->rx_vq, 0);
    return 1;
}

static int virtio_net_can_receive(void *opaque)
{
    VirtIONet *n = opaque;

    return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
}

static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
{
    int offset, i;

    offset = i = 0;
    while (offset < count && i < iovcnt) {
        int len = MIN(iov[i].iov_len, count - offset);
        memcpy(iov[i].iov_base, buf + offset, len);
        offset += len;
        i++;
    }

    return offset;
}

static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
                          const void *buf, size_t size, size_t hdr_len)
{
    struct virtio_net_hdr *hdr = iov[0].iov_base;
    int offset = 0;

    hdr->flags = 0;
    hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;

    /* We only ever receive a struct virtio_net_hdr from the tapfd,
     * but we may be passing along a larger header to the guest.
     */
    iov[0].iov_base += hdr_len;
    iov[0].iov_len  -= hdr_len;

    return offset;
}

static void virtio_net_receive(void *opaque, const uint8_t *buf, int size)
{
    VirtIONet *n = opaque;
    struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
    size_t hdr_len, offset, i;

    if (!do_virtio_net_can_receive(n, size))
        return;

    /* hdr_len refers to the header we supply to the guest */
    hdr_len = n->mergeable_rx_bufs ?
        sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);

    offset = i = 0;

    while (offset < size) {
        VirtQueueElement elem;
        int len, total;
        struct iovec sg[VIRTQUEUE_MAX_SIZE];

        len = total = 0;

        if ((i != 0 && !n->mergeable_rx_bufs) ||
            virtqueue_pop(n->rx_vq, &elem) == 0) {
            if (i == 0)
                return;
            fprintf(stderr, "virtio-net truncating packet\n");
            exit(1);
        }

        if (elem.in_num < 1) {
            fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
            exit(1);
        }

        if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
            fprintf(stderr, "virtio-net header not in first element\n");
            exit(1);
        }

        memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);

        if (i == 0) {
            if (n->mergeable_rx_bufs)
                mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;

            offset += receive_header(n, sg, elem.in_num,
                                     buf + offset, size - offset, hdr_len);
            total += hdr_len;
        }

        /* copy in packet.  ugh */
        len = iov_fill(sg, elem.in_num,
                       buf + offset, size - offset);
        total += len;

        /* signal other side */
        virtqueue_fill(n->rx_vq, &elem, total, i++);

        offset += len;
    }

    if (mhdr)
        mhdr->num_buffers = i;

    virtqueue_flush(n->rx_vq, i);
    virtio_notify(&n->vdev, n->rx_vq);
}

/* TX */
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
{
    VirtQueueElement elem;
    int has_vnet_hdr = 0;

    if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
        return;

    while (virtqueue_pop(vq, &elem)) {
        ssize_t len = 0;
        unsigned int out_num = elem.out_num;
        struct iovec *out_sg = &elem.out_sg[0];
        unsigned hdr_len;

        /* hdr_len refers to the header received from the guest */
        hdr_len = n->mergeable_rx_bufs ?
            sizeof(struct virtio_net_hdr_mrg_rxbuf) :
            sizeof(struct virtio_net_hdr);

        if (out_num < 1 || out_sg->iov_len != hdr_len) {
            fprintf(stderr, "virtio-net header not in first element\n");
            exit(1);
        }

        /* ignore the header if GSO is not supported */
        if (!has_vnet_hdr) {
            out_num--;
            out_sg++;
            len += hdr_len;
        } else if (n->mergeable_rx_bufs) {
            /* tapfd expects a struct virtio_net_hdr */
            hdr_len -= sizeof(struct virtio_net_hdr);
            out_sg->iov_len -= hdr_len;
            len += hdr_len;
        }

        len += qemu_sendv_packet(n->vc, out_sg, out_num);

        virtqueue_push(vq, &elem, len);
        virtio_notify(&n->vdev, vq);
    }
}

static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIONet *n = to_virtio_net(vdev);

    if (n->tx_timer_active) {
        virtio_queue_set_notification(vq, 1);
        qemu_del_timer(n->tx_timer);
        n->tx_timer_active = 0;
        virtio_net_flush_tx(n, vq);
    } else {
        qemu_mod_timer(n->tx_timer,
                       qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
        n->tx_timer_active = 1;
        virtio_queue_set_notification(vq, 0);
    }
}

static void virtio_net_tx_timer(void *opaque)
{
    VirtIONet *n = opaque;

    n->tx_timer_active = 0;

    /* Just in case the driver is not ready on more */
    if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
        return;

    virtio_queue_set_notification(n->tx_vq, 1);
    virtio_net_flush_tx(n, n->tx_vq);
}

static void virtio_net_save(QEMUFile *f, void *opaque)
{
    VirtIONet *n = opaque;

    virtio_save(&n->vdev, f);

    qemu_put_buffer(f, n->mac, 6);
    qemu_put_be32(f, n->tx_timer_active);
    qemu_put_be32(f, n->mergeable_rx_bufs);
    qemu_put_be16(f, n->status);
}

static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
{
    VirtIONet *n = opaque;

    if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
        return -EINVAL;

    virtio_load(&n->vdev, f);

    qemu_get_buffer(f, n->mac, 6);
    n->tx_timer_active = qemu_get_be32(f);
    n->mergeable_rx_bufs = qemu_get_be32(f);

    if (version_id >= 3)
        n->status = qemu_get_be16(f);

    if (n->tx_timer_active) {
        qemu_mod_timer(n->tx_timer,
                       qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
    }

    return 0;
}

void virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
{
    VirtIONet *n;
    static int virtio_net_id;

    n = (VirtIONet *)virtio_init_pci(bus, "virtio-net",
                                     PCI_VENDOR_ID_REDHAT_QUMRANET,
                                     PCI_DEVICE_ID_VIRTIO_NET,
                                     PCI_VENDOR_ID_REDHAT_QUMRANET,
                                     VIRTIO_ID_NET,
                                     PCI_CLASS_NETWORK_ETHERNET, 0x00,
                                     sizeof(struct virtio_net_config),
                                     sizeof(VirtIONet));
    if (!n)
        return;

    n->vdev.get_config = virtio_net_update_config;
    n->vdev.get_features = virtio_net_get_features;
    n->vdev.set_features = virtio_net_set_features;
    n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
    n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
    memcpy(n->mac, nd->macaddr, 6);
    n->status = VIRTIO_NET_S_LINK_UP;
    n->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
                                 virtio_net_receive, virtio_net_can_receive, n);
    n->vc->link_status_changed = virtio_net_set_link_status;

    qemu_format_nic_info_str(n->vc, n->mac);

    n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
    n->tx_timer_active = 0;
    n->mergeable_rx_bufs = 0;

    register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
                    virtio_net_save, virtio_net_load, n);
}
Commit	Line	Data
fbe78f4f AL	1	/*
	2	* Virtio Network Device
	3	*
	4	* Copyright IBM, Corp. 2007
	5	*
	6	* Authors:
	7	* Anthony Liguori <aliguori@us.ibm.com>
	8	*
	9	* This work is licensed under the terms of the GNU GPL, version 2. See
	10	* the COPYING file in the top-level directory.
	11	*
	12	*/
	13
	14	#include "virtio.h"
	15	#include "net.h"
	16	#include "qemu-timer.h"
	17	#include "virtio-net.h"
	18
9d6271b8 AL	19	#define VIRTIO_NET_VM_VERSION 3
9d6271b8 AL	20
fbe78f4f AL	21	typedef struct VirtIONet
	22	{
	23	VirtIODevice vdev;
	24	uint8_t mac[6];
554c97dd	25	uint16_t status;
fbe78f4f AL	26	VirtQueue *rx_vq;
	27	VirtQueue *tx_vq;
	28	VLANClientState *vc;
	29	QEMUTimer *tx_timer;
	30	int tx_timer_active;
	31	int mergeable_rx_bufs;
	32	} VirtIONet;
	33
	34	/* TODO
	35	* - we could suppress RX interrupt if we were so inclined.
	36	*/
	37
	38	static VirtIONet to_virtio_net(VirtIODevice vdev)
	39	{
	40	return (VirtIONet *)vdev;
	41	}
	42
	43	static void virtio_net_update_config(VirtIODevice vdev, uint8_t config)
	44	{
	45	VirtIONet *n = to_virtio_net(vdev);
	46	struct virtio_net_config netcfg;
	47
554c97dd	48	netcfg.status = n->status;
fbe78f4f AL	49	memcpy(netcfg.mac, n->mac, 6);
	50	memcpy(config, &netcfg, sizeof(netcfg));
	51	}
	52
554c97dd AL	53	static void virtio_net_set_link_status(VLANClientState *vc)
	54	{
	55	VirtIONet *n = vc->opaque;
	56	uint16_t old_status = n->status;
	57
	58	if (vc->link_down)
	59	n->status &= ~VIRTIO_NET_S_LINK_UP;
	60	else
	61	n->status \|= VIRTIO_NET_S_LINK_UP;
	62
	63	if (n->status != old_status)
	64	virtio_notify_config(&n->vdev);
	65	}
	66
fbe78f4f AL	67	static uint32_t virtio_net_get_features(VirtIODevice *vdev)
fbe78f4f AL	68	{
554c97dd	69	uint32_t features = (1 << VIRTIO_NET_F_MAC) \| (1 << VIRTIO_NET_F_STATUS);
fbe78f4f AL	70
	71	return features;
	72	}
	73
	74	static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
	75	{
	76	VirtIONet *n = to_virtio_net(vdev);
	77
	78	n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
	79	}
	80
	81	/* RX */
	82
	83	static void virtio_net_handle_rx(VirtIODevice vdev, VirtQueue vq)
	84	{
	85	}
	86
	87	static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
	88	{
	89	if (!virtio_queue_ready(n->rx_vq) \|\|
	90	!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
	91	return 0;
	92
	93	if (virtio_queue_empty(n->rx_vq) \|\|
	94	(n->mergeable_rx_bufs &&
	95	!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
	96	virtio_queue_set_notification(n->rx_vq, 1);
	97	return 0;
	98	}
	99
	100	virtio_queue_set_notification(n->rx_vq, 0);
	101	return 1;
	102	}
	103
	104	static int virtio_net_can_receive(void *opaque)
	105	{
	106	VirtIONet *n = opaque;
	107
	108	return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
	109	}
	110
	111	static int iov_fill(struct iovec iov, int iovcnt, const void buf, int count)
	112	{
	113	int offset, i;
	114
	115	offset = i = 0;
	116	while (offset < count && i < iovcnt) {
	117	int len = MIN(iov[i].iov_len, count - offset);
	118	memcpy(iov[i].iov_base, buf + offset, len);
	119	offset += len;
	120	i++;
	121	}
	122
	123	return offset;
	124	}
	125
	126	static int receive_header(VirtIONet n, struct iovec iov, int iovcnt,
4689f4b3	127	const void *buf, size_t size, size_t hdr_len)
fbe78f4f AL	128	{
	129	struct virtio_net_hdr *hdr = iov[0].iov_base;
	130	int offset = 0;
	131
	132	hdr->flags = 0;
	133	hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
	134
	135	/* We only ever receive a struct virtio_net_hdr from the tapfd,
	136	* but we may be passing along a larger header to the guest.
	137	*/
	138	iov[0].iov_base += hdr_len;
	139	iov[0].iov_len -= hdr_len;
	140
	141	return offset;
	142	}
	143
	144	static void virtio_net_receive(void opaque, const uint8_t buf, int size)
	145	{
	146	VirtIONet *n = opaque;
	147	struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
4689f4b3	148	size_t hdr_len, offset, i;
fbe78f4f AL	149
	150	if (!do_virtio_net_can_receive(n, size))
	151	return;
	152
	153	/* hdr_len refers to the header we supply to the guest */
	154	hdr_len = n->mergeable_rx_bufs ?
	155	sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
	156
	157	offset = i = 0;
	158
	159	while (offset < size) {
	160	VirtQueueElement elem;
	161	int len, total;
	162	struct iovec sg[VIRTQUEUE_MAX_SIZE];
	163
	164	len = total = 0;
	165
	166	if ((i != 0 && !n->mergeable_rx_bufs) \|\|
	167	virtqueue_pop(n->rx_vq, &elem) == 0) {
	168	if (i == 0)
	169	return;
	170	fprintf(stderr, "virtio-net truncating packet\n");
	171	exit(1);
	172	}
	173
	174	if (elem.in_num < 1) {
	175	fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
	176	exit(1);
	177	}
	178
	179	if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
	180	fprintf(stderr, "virtio-net header not in first element\n");
	181	exit(1);
	182	}
	183
	184	memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
	185
	186	if (i == 0) {
	187	if (n->mergeable_rx_bufs)
	188	mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
	189
	190	offset += receive_header(n, sg, elem.in_num,
	191	buf + offset, size - offset, hdr_len);
	192	total += hdr_len;
	193	}
	194
	195	/* copy in packet. ugh */
	196	len = iov_fill(sg, elem.in_num,
	197	buf + offset, size - offset);
	198	total += len;
	199
	200	/* signal other side */
	201	virtqueue_fill(n->rx_vq, &elem, total, i++);
	202
	203	offset += len;
	204	}
	205
	206	if (mhdr)
	207	mhdr->num_buffers = i;
	208
	209	virtqueue_flush(n->rx_vq, i);
	210	virtio_notify(&n->vdev, n->rx_vq);
	211	}
	212
213	/* TX */
214	static void virtio_net_flush_tx(VirtIONet n, VirtQueue vq)
215	{
216	VirtQueueElement elem;
217	int has_vnet_hdr = 0;
218
219	if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
220	return;
221
222	while (virtqueue_pop(vq, &elem)) {
223	ssize_t len = 0;
224	unsigned int out_num = elem.out_num;
225	struct iovec *out_sg = &elem.out_sg[0];
226	unsigned hdr_len;
227
228	/* hdr_len refers to the header received from the guest */
229	hdr_len = n->mergeable_rx_bufs ?
230	sizeof(struct virtio_net_hdr_mrg_rxbuf) :
231	sizeof(struct virtio_net_hdr);
232
233	if (out_num < 1 \|\| out_sg->iov_len != hdr_len) {
234	fprintf(stderr, "virtio-net header not in first element\n");
235	exit(1);
236	}
237
238	/* ignore the header if GSO is not supported */
239	if (!has_vnet_hdr) {
240	out_num--;
241	out_sg++;
242	len += hdr_len;
243	} else if (n->mergeable_rx_bufs) {
244	/* tapfd expects a struct virtio_net_hdr */
245	hdr_len -= sizeof(struct virtio_net_hdr);
246	out_sg->iov_len -= hdr_len;
247	len += hdr_len;
248	}
249
250	len += qemu_sendv_packet(n->vc, out_sg, out_num);
251
252	virtqueue_push(vq, &elem, len);
253	virtio_notify(&n->vdev, vq);
254	}
255	}
256
257	static void virtio_net_handle_tx(VirtIODevice vdev, VirtQueue vq)
258	{
259	VirtIONet *n = to_virtio_net(vdev);
260
261	if (n->tx_timer_active) {
262	virtio_queue_set_notification(vq, 1);
263	qemu_del_timer(n->tx_timer);
264	n->tx_timer_active = 0;
265	virtio_net_flush_tx(n, vq);
266	} else {
267	qemu_mod_timer(n->tx_timer,
268	qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
269	n->tx_timer_active = 1;
270	virtio_queue_set_notification(vq, 0);
271	}
272	}
273
274	static void virtio_net_tx_timer(void *opaque)
275	{
276	VirtIONet *n = opaque;
277
278	n->tx_timer_active = 0;
279
280	/* Just in case the driver is not ready on more */
281	if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
282	return;
283
284	virtio_queue_set_notification(n->tx_vq, 1);
285	virtio_net_flush_tx(n, n->tx_vq);
286	}
287
288	static void virtio_net_save(QEMUFile f, void opaque)
289	{
290	VirtIONet *n = opaque;
291
292	virtio_save(&n->vdev, f);
293
294	qemu_put_buffer(f, n->mac, 6);
295	qemu_put_be32(f, n->tx_timer_active);
e46cb38f	296	qemu_put_be32(f, n->mergeable_rx_bufs);
9d6271b8	297	qemu_put_be16(f, n->status);
fbe78f4f AL	298	}
	299
	300	static int virtio_net_load(QEMUFile f, void opaque, int version_id)
	301	{
	302	VirtIONet *n = opaque;
	303
9d6271b8	304	if (version_id < 2 \|\| version_id > VIRTIO_NET_VM_VERSION)
fbe78f4f AL	305	return -EINVAL;
	306
	307	virtio_load(&n->vdev, f);
	308
	309	qemu_get_buffer(f, n->mac, 6);
	310	n->tx_timer_active = qemu_get_be32(f);
e46cb38f	311	n->mergeable_rx_bufs = qemu_get_be32(f);
fbe78f4f	312
9d6271b8 AL	313	if (version_id >= 3)
	314	n->status = qemu_get_be16(f);
	315
fbe78f4f AL	316	if (n->tx_timer_active) {
	317	qemu_mod_timer(n->tx_timer,
	318	qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
	319	}
	320
	321	return 0;
	322	}
	323
291c6ff9	324	void virtio_net_init(PCIBus bus, NICInfo nd, int devfn)
fbe78f4f AL	325	{
	326	VirtIONet *n;
	327	static int virtio_net_id;
	328
a7c4996b AL	329	n = (VirtIONet *)virtio_init_pci(bus, "virtio-net",
	330	PCI_VENDOR_ID_REDHAT_QUMRANET,
	331	PCI_DEVICE_ID_VIRTIO_NET,
99b3718e AL	332	PCI_VENDOR_ID_REDHAT_QUMRANET,
99b3718e AL	333	VIRTIO_ID_NET,
173a543b	334	PCI_CLASS_NETWORK_ETHERNET, 0x00,
554c97dd AL	335	sizeof(struct virtio_net_config),
554c97dd AL	336	sizeof(VirtIONet));
fbe78f4f	337	if (!n)
291c6ff9	338	return;
fbe78f4f AL	339
	340	n->vdev.get_config = virtio_net_update_config;
	341	n->vdev.get_features = virtio_net_get_features;
	342	n->vdev.set_features = virtio_net_set_features;
	343	n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
	344	n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
	345	memcpy(n->mac, nd->macaddr, 6);
554c97dd	346	n->status = VIRTIO_NET_S_LINK_UP;
7a9f6e4a	347	n->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
bf38c1a0	348	virtio_net_receive, virtio_net_can_receive, n);
554c97dd	349	n->vc->link_status_changed = virtio_net_set_link_status;
fbe78f4f	350
96d5e201 AL	351	qemu_format_nic_info_str(n->vc, n->mac);
96d5e201 AL	352
fbe78f4f AL	353	n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
	354	n->tx_timer_active = 0;
	355	n->mergeable_rx_bufs = 0;
	356
9d6271b8	357	register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
fbe78f4f	358	virtio_net_save, virtio_net_load, n);
fbe78f4f	359	}