[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    6

#define MAC_TABLE_ENTRIES    32
#define MAX_VLAN    (1 << 12)   /* Per 802.1Q definition */

typedef struct VirtIONet
{
    VirtIODevice vdev;
    uint8_t mac[ETH_ALEN];
    uint16_t status;
    VirtQueue *rx_vq;
    VirtQueue *tx_vq;
    VirtQueue *ctrl_vq;
    VLANClientState *vc;
    QEMUTimer *tx_timer;
    int tx_timer_active;
    int mergeable_rx_bufs;
    int promisc;
    int allmulti;
    struct {
        int in_use;
        uint8_t *macs;
    } mac_table;
    uint32_t *vlans;
} 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_get_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, ETH_ALEN);
    memcpy(config, &netcfg, sizeof(netcfg));
}

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

    memcpy(&netcfg, config, sizeof(netcfg));

    if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
        memcpy(n->mac, netcfg.mac, ETH_ALEN);
        qemu_format_nic_info_str(n->vc, n->mac);
    }
}

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 void virtio_net_reset(VirtIODevice *vdev)
{
    VirtIONet *n = to_virtio_net(vdev);

    /* Reset back to compatibility mode */
    n->promisc = 1;
    n->allmulti = 0;

    /* Flush any MAC and VLAN filter table state */
    n->mac_table.in_use = 0;
    memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
    memset(n->vlans, 0, MAX_VLAN >> 3);
}

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

    return 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_GUEST_CSUM);
    features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
    features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
    features |= (1 << VIRTIO_NET_F_GUEST_ECN);

    return features & virtio_net_get_features(vdev);
}

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));
}

static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
                                     VirtQueueElement *elem)
{
    uint8_t on;

    if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
        fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
        exit(1);
    }

    on = ldub_p(elem->out_sg[1].iov_base);

    if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
        n->promisc = on;
    else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
        n->allmulti = on;
    else
        return VIRTIO_NET_ERR;

    return VIRTIO_NET_OK;
}

static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
                                 VirtQueueElement *elem)
{
    struct virtio_net_ctrl_mac mac_data;

    if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
        elem->out_sg[1].iov_len < sizeof(mac_data) ||
        elem->out_sg[2].iov_len < sizeof(mac_data))
        return VIRTIO_NET_ERR;

    n->mac_table.in_use = 0;
    memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);

    mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);

    if (sizeof(mac_data.entries) +
        (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
        return VIRTIO_NET_ERR;

    if (mac_data.entries <= MAC_TABLE_ENTRIES) {
        memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
               mac_data.entries * ETH_ALEN);
        n->mac_table.in_use += mac_data.entries;
    } else {
        n->promisc = 1;
        return VIRTIO_NET_OK;
    }

    mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);

    if (sizeof(mac_data.entries) +
        (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
        return VIRTIO_NET_ERR;

    if (mac_data.entries) {
        if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
            memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
                   elem->out_sg[2].iov_base + sizeof(mac_data),
                   mac_data.entries * ETH_ALEN);
            n->mac_table.in_use += mac_data.entries;
        } else
            n->allmulti = 1;
    }

    return VIRTIO_NET_OK;
}

static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
                                        VirtQueueElement *elem)
{
    uint16_t vid;

    if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
        fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
        return VIRTIO_NET_ERR;
    }

    vid = lduw_le_p(elem->out_sg[1].iov_base);

    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 void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIONet *n = to_virtio_net(vdev);
    struct virtio_net_ctrl_hdr ctrl;
    virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
    VirtQueueElement elem;

    while (virtqueue_pop(vq, &elem)) {
        if ((elem.in_num < 1) || (elem.out_num < 1)) {
            fprintf(stderr, "virtio-net ctrl missing headers\n");
            exit(1);
        }

        if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
            elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
            fprintf(stderr, "virtio-net ctrl header not in correct element\n");
            exit(1);
        }

        ctrl.class = ldub_p(elem.out_sg[0].iov_base);
        ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));

        if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
            status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
        else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
            status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
        else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
            status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);

        stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);

        virtqueue_push(vq, &elem, sizeof(status));
        virtio_notify(vdev, vq);
    }
}

/* 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 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;

    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) && n->allmulti)
        return 1;

    if (!memcmp(ptr, bcast, sizeof(bcast)))
        return 1;

    if (!memcmp(ptr, n->mac, ETH_ALEN))
        return 1;

    for (i = 0; i < n->mac_table.in_use; i++) {
        if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))
            return 1;
    }

    return 0;
}

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;

    if (!receive_filter(n, buf, 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, ETH_ALEN);
    qemu_put_be32(f, n->tx_timer_active);
    qemu_put_be32(f, n->mergeable_rx_bufs);
    qemu_put_be16(f, n->status);
    qemu_put_be32(f, n->promisc);
    qemu_put_be32(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);
}

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, ETH_ALEN);
    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 (version_id >= 4) {
        n->promisc = qemu_get_be32(f);
        n->allmulti = qemu_get_be32(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) {
            qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
            n->promisc = 1;
            n->mac_table.in_use = 0;
        }
    }
 
    if (version_id >= 6)
        qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);

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

    return 0;
}

static void virtio_net_cleanup(VLANClientState *vc)
{
    VirtIONet *n = vc->opaque;

    unregister_savevm("virtio-net", n);

    qemu_free(n->mac_table.macs);
    qemu_free(n->vlans);

    qemu_del_timer(n->tx_timer);
    qemu_free_timer(n->tx_timer);

    virtio_cleanup(&n->vdev);
}

PCIDevice *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 NULL;

    n->vdev.get_config = virtio_net_get_config;
    n->vdev.set_config = virtio_net_set_config;
    n->vdev.get_features = virtio_net_get_features;
    n->vdev.set_features = virtio_net_set_features;
    n->vdev.bad_features = virtio_net_bad_features;
    n->vdev.reset = virtio_net_reset;
    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);
    n->ctrl_vq = virtio_add_queue(&n->vdev, 16, virtio_net_handle_ctrl);
    memcpy(n->mac, nd->macaddr, ETH_ALEN);
    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,
                                 virtio_net_cleanup, 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;
    n->promisc = 1; /* for compatibility */

    n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);

    n->vlans = qemu_mallocz(MAX_VLAN >> 3);

    register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
                    virtio_net_save, virtio_net_load, n);
    return (PCIDevice *)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
f21c0ed9	19	#define VIRTIO_NET_VM_VERSION 6
b6503ed9 AL	20
b6503ed9 AL	21	#define MAC_TABLE_ENTRIES 32
f21c0ed9	22	#define MAX_VLAN (1 << 12) /* Per 802.1Q definition */
9d6271b8	23
fbe78f4f AL	24	typedef struct VirtIONet
	25	{
	26	VirtIODevice vdev;
79674068	27	uint8_t mac[ETH_ALEN];
554c97dd	28	uint16_t status;
fbe78f4f AL	29	VirtQueue *rx_vq;
fbe78f4f AL	30	VirtQueue *tx_vq;
3d11d36c	31	VirtQueue *ctrl_vq;
fbe78f4f AL	32	VLANClientState *vc;
	33	QEMUTimer *tx_timer;
	34	int tx_timer_active;
	35	int mergeable_rx_bufs;
002437cd AL	36	int promisc;
002437cd AL	37	int allmulti;
b6503ed9 AL	38	struct {
	39	int in_use;
	40	uint8_t *macs;
	41	} mac_table;
f21c0ed9	42	uint32_t *vlans;
fbe78f4f AL	43	} VirtIONet;
	44
	45	/* TODO
	46	* - we could suppress RX interrupt if we were so inclined.
	47	*/
	48
	49	static VirtIONet to_virtio_net(VirtIODevice vdev)
	50	{
	51	return (VirtIONet *)vdev;
	52	}
	53
0f03eca6	54	static void virtio_net_get_config(VirtIODevice vdev, uint8_t config)
fbe78f4f AL	55	{
	56	VirtIONet *n = to_virtio_net(vdev);
	57	struct virtio_net_config netcfg;
	58
554c97dd	59	netcfg.status = n->status;
79674068	60	memcpy(netcfg.mac, n->mac, ETH_ALEN);
fbe78f4f AL	61	memcpy(config, &netcfg, sizeof(netcfg));
	62	}
	63
0f03eca6 AL	64	static void virtio_net_set_config(VirtIODevice vdev, const uint8_t config)
	65	{
	66	VirtIONet *n = to_virtio_net(vdev);
	67	struct virtio_net_config netcfg;
	68
	69	memcpy(&netcfg, config, sizeof(netcfg));
	70
79674068 AL	71	if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
79674068 AL	72	memcpy(n->mac, netcfg.mac, ETH_ALEN);
0f03eca6 AL	73	qemu_format_nic_info_str(n->vc, n->mac);
	74	}
	75	}
	76
554c97dd AL	77	static void virtio_net_set_link_status(VLANClientState *vc)
	78	{
	79	VirtIONet *n = vc->opaque;
	80	uint16_t old_status = n->status;
	81
	82	if (vc->link_down)
	83	n->status &= ~VIRTIO_NET_S_LINK_UP;
	84	else
	85	n->status \|= VIRTIO_NET_S_LINK_UP;
	86
	87	if (n->status != old_status)
	88	virtio_notify_config(&n->vdev);
	89	}
	90
002437cd AL	91	static void virtio_net_reset(VirtIODevice *vdev)
	92	{
	93	VirtIONet *n = to_virtio_net(vdev);
	94
	95	/* Reset back to compatibility mode */
	96	n->promisc = 1;
	97	n->allmulti = 0;
b6503ed9	98
f21c0ed9	99	/* Flush any MAC and VLAN filter table state */
b6503ed9 AL	100	n->mac_table.in_use = 0;
b6503ed9 AL	101	memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
f21c0ed9	102	memset(n->vlans, 0, MAX_VLAN >> 3);
002437cd AL	103	}
002437cd AL	104
fbe78f4f AL	105	static uint32_t virtio_net_get_features(VirtIODevice *vdev)
fbe78f4f AL	106	{
3d11d36c AL	107	uint32_t features = (1 << VIRTIO_NET_F_MAC) \|
3d11d36c AL	108	(1 << VIRTIO_NET_F_STATUS) \|
b6503ed9	109	(1 << VIRTIO_NET_F_CTRL_VQ) \|
f21c0ed9 AL	110	(1 << VIRTIO_NET_F_CTRL_RX) \|
f21c0ed9 AL	111	(1 << VIRTIO_NET_F_CTRL_VLAN);
fbe78f4f AL	112
	113	return features;
	114	}
	115
c61ad618 AL	116	static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
	117	{
	118	uint32_t features = 0;
	119
	120	/* Linux kernel 2.6.25. It understood MAC (as everyone must),
	121	* but also these: */
	122	features \|= (1 << VIRTIO_NET_F_MAC);
	123	features \|= (1 << VIRTIO_NET_F_GUEST_CSUM);
	124	features \|= (1 << VIRTIO_NET_F_GUEST_TSO4);
	125	features \|= (1 << VIRTIO_NET_F_GUEST_TSO6);
	126	features \|= (1 << VIRTIO_NET_F_GUEST_ECN);
	127
	128	return features & virtio_net_get_features(vdev);
	129	}
	130
fbe78f4f AL	131	static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
	132	{
	133	VirtIONet *n = to_virtio_net(vdev);
	134
	135	n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
	136	}
	137
002437cd AL	138	static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
	139	VirtQueueElement *elem)
	140	{
	141	uint8_t on;
	142
	143	if (elem->out_num != 2 \|\| elem->out_sg[1].iov_len != sizeof(on)) {
	144	fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
	145	exit(1);
	146	}
	147
	148	on = ldub_p(elem->out_sg[1].iov_base);
	149
	150	if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
	151	n->promisc = on;
	152	else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
	153	n->allmulti = on;
	154	else
	155	return VIRTIO_NET_ERR;
	156
	157	return VIRTIO_NET_OK;
	158	}
	159
b6503ed9 AL	160	static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
	161	VirtQueueElement *elem)
	162	{
	163	struct virtio_net_ctrl_mac mac_data;
	164
	165	if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET \|\| elem->out_num != 3 \|\|
	166	elem->out_sg[1].iov_len < sizeof(mac_data) \|\|
	167	elem->out_sg[2].iov_len < sizeof(mac_data))
	168	return VIRTIO_NET_ERR;
	169
	170	n->mac_table.in_use = 0;
	171	memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
	172
	173	mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
	174
	175	if (sizeof(mac_data.entries) +
	176	(mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
	177	return VIRTIO_NET_ERR;
	178
	179	if (mac_data.entries <= MAC_TABLE_ENTRIES) {
	180	memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
	181	mac_data.entries * ETH_ALEN);
	182	n->mac_table.in_use += mac_data.entries;
	183	} else {
	184	n->promisc = 1;
	185	return VIRTIO_NET_OK;
	186	}
	187
	188	mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
	189
	190	if (sizeof(mac_data.entries) +
	191	(mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
	192	return VIRTIO_NET_ERR;
	193
	194	if (mac_data.entries) {
	195	if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
	196	memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
	197	elem->out_sg[2].iov_base + sizeof(mac_data),
	198	mac_data.entries * ETH_ALEN);
	199	n->mac_table.in_use += mac_data.entries;
	200	} else
	201	n->allmulti = 1;
	202	}
	203
	204	return VIRTIO_NET_OK;
	205	}
	206
f21c0ed9 AL	207	static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
	208	VirtQueueElement *elem)
	209	{
	210	uint16_t vid;
	211
	212	if (elem->out_num != 2 \|\| elem->out_sg[1].iov_len != sizeof(vid)) {
	213	fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
	214	return VIRTIO_NET_ERR;
	215	}
	216
	217	vid = lduw_le_p(elem->out_sg[1].iov_base);
	218
	219	if (vid >= MAX_VLAN)
	220	return VIRTIO_NET_ERR;
	221
	222	if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
	223	n->vlans[vid >> 5] \|= (1U << (vid & 0x1f));
	224	else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
	225	n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
	226	else
	227	return VIRTIO_NET_ERR;
	228
	229	return VIRTIO_NET_OK;
	230	}
	231
3d11d36c AL	232	static void virtio_net_handle_ctrl(VirtIODevice vdev, VirtQueue vq)
3d11d36c AL	233	{
002437cd	234	VirtIONet *n = to_virtio_net(vdev);
3d11d36c AL	235	struct virtio_net_ctrl_hdr ctrl;
	236	virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
	237	VirtQueueElement elem;
	238
	239	while (virtqueue_pop(vq, &elem)) {
	240	if ((elem.in_num < 1) \|\| (elem.out_num < 1)) {
	241	fprintf(stderr, "virtio-net ctrl missing headers\n");
	242	exit(1);
	243	}
	244
	245	if (elem.out_sg[0].iov_len < sizeof(ctrl) \|\|
3df962a3	246	elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
3d11d36c AL	247	fprintf(stderr, "virtio-net ctrl header not in correct element\n");
	248	exit(1);
	249	}
	250
	251	ctrl.class = ldub_p(elem.out_sg[0].iov_base);
	252	ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
	253
002437cd AL	254	if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
002437cd AL	255	status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
b6503ed9 AL	256	else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
b6503ed9 AL	257	status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
f21c0ed9 AL	258	else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
f21c0ed9 AL	259	status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
002437cd	260
3d11d36c AL	261	stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
	262
	263	virtqueue_push(vq, &elem, sizeof(status));
	264	virtio_notify(vdev, vq);
	265	}
	266	}
	267
fbe78f4f AL	268	/* RX */
	269
	270	static void virtio_net_handle_rx(VirtIODevice vdev, VirtQueue vq)
	271	{
	272	}
	273
	274	static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
	275	{
	276	if (!virtio_queue_ready(n->rx_vq) \|\|
	277	!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
	278	return 0;
	279
	280	if (virtio_queue_empty(n->rx_vq) \|\|
	281	(n->mergeable_rx_bufs &&
	282	!virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
	283	virtio_queue_set_notification(n->rx_vq, 1);
	284	return 0;
	285	}
	286
	287	virtio_queue_set_notification(n->rx_vq, 0);
	288	return 1;
	289	}
	290
	291	static int virtio_net_can_receive(void *opaque)
	292	{
	293	VirtIONet *n = opaque;
	294
	295	return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
	296	}
	297
	298	static int iov_fill(struct iovec iov, int iovcnt, const void buf, int count)
	299	{
	300	int offset, i;
	301
	302	offset = i = 0;
	303	while (offset < count && i < iovcnt) {
	304	int len = MIN(iov[i].iov_len, count - offset);
	305	memcpy(iov[i].iov_base, buf + offset, len);
	306	offset += len;
	307	i++;
	308	}
	309
	310	return offset;
	311	}
	312
	313	static int receive_header(VirtIONet n, struct iovec iov, int iovcnt,
4689f4b3	314	const void *buf, size_t size, size_t hdr_len)
fbe78f4f AL	315	{
	316	struct virtio_net_hdr *hdr = iov[0].iov_base;
	317	int offset = 0;
	318
	319	hdr->flags = 0;
	320	hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
	321
	322	/* We only ever receive a struct virtio_net_hdr from the tapfd,
	323	* but we may be passing along a larger header to the guest.
	324	*/
	325	iov[0].iov_base += hdr_len;
	326	iov[0].iov_len -= hdr_len;
	327
	328	return offset;
	329	}
	330
3831ab20 AL	331	static int receive_filter(VirtIONet n, const uint8_t buf, int size)
	332	{
	333	static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
f21c0ed9	334	static const uint8_t vlan[] = {0x81, 0x00};
3831ab20	335	uint8_t ptr = (uint8_t )buf;
b6503ed9	336	int i;
3831ab20 AL	337
	338	if (n->promisc)
	339	return 1;
	340
f21c0ed9 AL	341	if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
	342	int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
	343	if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
	344	return 0;
	345	}
	346
3831ab20 AL	347	if ((ptr[0] & 1) && n->allmulti)
	348	return 1;
	349
	350	if (!memcmp(ptr, bcast, sizeof(bcast)))
	351	return 1;
	352
	353	if (!memcmp(ptr, n->mac, ETH_ALEN))
	354	return 1;
	355
b6503ed9 AL	356	for (i = 0; i < n->mac_table.in_use; i++) {
	357	if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))
	358	return 1;
	359	}
	360
3831ab20 AL	361	return 0;
	362	}
	363
fbe78f4f AL	364	static void virtio_net_receive(void opaque, const uint8_t buf, int size)
	365	{
	366	VirtIONet *n = opaque;
	367	struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
4689f4b3	368	size_t hdr_len, offset, i;
fbe78f4f AL	369
	370	if (!do_virtio_net_can_receive(n, size))
	371	return;
	372
3831ab20 AL	373	if (!receive_filter(n, buf, size))
	374	return;
	375
fbe78f4f AL	376	/* hdr_len refers to the header we supply to the guest */
	377	hdr_len = n->mergeable_rx_bufs ?
	378	sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
	379
	380	offset = i = 0;
	381
	382	while (offset < size) {
	383	VirtQueueElement elem;
	384	int len, total;
	385	struct iovec sg[VIRTQUEUE_MAX_SIZE];
	386
	387	len = total = 0;
	388
	389	if ((i != 0 && !n->mergeable_rx_bufs) \|\|
	390	virtqueue_pop(n->rx_vq, &elem) == 0) {
	391	if (i == 0)
	392	return;
	393	fprintf(stderr, "virtio-net truncating packet\n");
	394	exit(1);
	395	}
	396
	397	if (elem.in_num < 1) {
	398	fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
	399	exit(1);
	400	}
	401
	402	if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
	403	fprintf(stderr, "virtio-net header not in first element\n");
	404	exit(1);
	405	}
	406
	407	memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
	408
	409	if (i == 0) {
	410	if (n->mergeable_rx_bufs)
	411	mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
	412
	413	offset += receive_header(n, sg, elem.in_num,
	414	buf + offset, size - offset, hdr_len);
	415	total += hdr_len;
	416	}
	417
	418	/* copy in packet. ugh */
	419	len = iov_fill(sg, elem.in_num,
	420	buf + offset, size - offset);
	421	total += len;
	422
	423	/* signal other side */
	424	virtqueue_fill(n->rx_vq, &elem, total, i++);
	425
	426	offset += len;
	427	}
	428
	429	if (mhdr)
	430	mhdr->num_buffers = i;
	431
	432	virtqueue_flush(n->rx_vq, i);
	433	virtio_notify(&n->vdev, n->rx_vq);
	434	}
	435
	436	/* TX */
	437	static void virtio_net_flush_tx(VirtIONet n, VirtQueue vq)
	438	{
	439	VirtQueueElement elem;
440	int has_vnet_hdr = 0;
441
442	if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
443	return;
444
445	while (virtqueue_pop(vq, &elem)) {
446	ssize_t len = 0;
447	unsigned int out_num = elem.out_num;
448	struct iovec *out_sg = &elem.out_sg[0];
449	unsigned hdr_len;
450
451	/* hdr_len refers to the header received from the guest */
452	hdr_len = n->mergeable_rx_bufs ?
453	sizeof(struct virtio_net_hdr_mrg_rxbuf) :
454	sizeof(struct virtio_net_hdr);
455
456	if (out_num < 1 \|\| out_sg->iov_len != hdr_len) {
457	fprintf(stderr, "virtio-net header not in first element\n");
458	exit(1);
459	}
460
461	/* ignore the header if GSO is not supported */
462	if (!has_vnet_hdr) {
463	out_num--;
464	out_sg++;
465	len += hdr_len;
466	} else if (n->mergeable_rx_bufs) {
467	/* tapfd expects a struct virtio_net_hdr */
468	hdr_len -= sizeof(struct virtio_net_hdr);
469	out_sg->iov_len -= hdr_len;
470	len += hdr_len;
471	}
472
473	len += qemu_sendv_packet(n->vc, out_sg, out_num);
474
475	virtqueue_push(vq, &elem, len);
476	virtio_notify(&n->vdev, vq);
477	}
478	}
479
480	static void virtio_net_handle_tx(VirtIODevice vdev, VirtQueue vq)
481	{
482	VirtIONet *n = to_virtio_net(vdev);
483
484	if (n->tx_timer_active) {
485	virtio_queue_set_notification(vq, 1);
486	qemu_del_timer(n->tx_timer);
487	n->tx_timer_active = 0;
488	virtio_net_flush_tx(n, vq);
489	} else {
490	qemu_mod_timer(n->tx_timer,
491	qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
492	n->tx_timer_active = 1;
493	virtio_queue_set_notification(vq, 0);
494	}
495	}
496
497	static void virtio_net_tx_timer(void *opaque)
498	{
499	VirtIONet *n = opaque;
500
501	n->tx_timer_active = 0;
502
503	/* Just in case the driver is not ready on more */
504	if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
505	return;
506
507	virtio_queue_set_notification(n->tx_vq, 1);
508	virtio_net_flush_tx(n, n->tx_vq);
509	}
510
511	static void virtio_net_save(QEMUFile f, void opaque)
512	{
513	VirtIONet *n = opaque;
514
515	virtio_save(&n->vdev, f);
516
79674068	517	qemu_put_buffer(f, n->mac, ETH_ALEN);
fbe78f4f	518	qemu_put_be32(f, n->tx_timer_active);
e46cb38f	519	qemu_put_be32(f, n->mergeable_rx_bufs);
9d6271b8	520	qemu_put_be16(f, n->status);
002437cd AL	521	qemu_put_be32(f, n->promisc);
002437cd AL	522	qemu_put_be32(f, n->allmulti);
b6503ed9 AL	523	qemu_put_be32(f, n->mac_table.in_use);
b6503ed9 AL	524	qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
f21c0ed9	525	qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
fbe78f4f AL	526	}
	527
	528	static int virtio_net_load(QEMUFile f, void opaque, int version_id)
	529	{
	530	VirtIONet *n = opaque;
	531
9d6271b8	532	if (version_id < 2 \|\| version_id > VIRTIO_NET_VM_VERSION)
fbe78f4f AL	533	return -EINVAL;
	534
	535	virtio_load(&n->vdev, f);
	536
79674068	537	qemu_get_buffer(f, n->mac, ETH_ALEN);
fbe78f4f	538	n->tx_timer_active = qemu_get_be32(f);
e46cb38f	539	n->mergeable_rx_bufs = qemu_get_be32(f);
fbe78f4f	540
9d6271b8 AL	541	if (version_id >= 3)
	542	n->status = qemu_get_be16(f);
	543
002437cd AL	544	if (version_id >= 4) {
	545	n->promisc = qemu_get_be32(f);
	546	n->allmulti = qemu_get_be32(f);
	547	}
	548
b6503ed9 AL	549	if (version_id >= 5) {
	550	n->mac_table.in_use = qemu_get_be32(f);
	551	/* MAC_TABLE_ENTRIES may be different from the saved image */
	552	if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
	553	qemu_get_buffer(f, n->mac_table.macs,
	554	n->mac_table.in_use * ETH_ALEN);
	555	} else if (n->mac_table.in_use) {
	556	qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
	557	n->promisc = 1;
	558	n->mac_table.in_use = 0;
	559	}
	560	}
	561
f21c0ed9 AL	562	if (version_id >= 6)
	563	qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
	564
fbe78f4f AL	565	if (n->tx_timer_active) {
	566	qemu_mod_timer(n->tx_timer,
	567	qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
	568	}
	569
	570	return 0;
	571	}
	572
a34b6eb7 AL	573	static void virtio_net_cleanup(VLANClientState *vc)
	574	{
	575	VirtIONet *n = vc->opaque;
	576
	577	unregister_savevm("virtio-net", n);
	578
	579	qemu_free(n->mac_table.macs);
	580	qemu_free(n->vlans);
	581
	582	qemu_del_timer(n->tx_timer);
	583	qemu_free_timer(n->tx_timer);
	584
	585	virtio_cleanup(&n->vdev);
	586	}
	587
72da4208	588	PCIDevice virtio_net_init(PCIBus bus, NICInfo *nd, int devfn)
fbe78f4f AL	589	{
	590	VirtIONet *n;
	591	static int virtio_net_id;
	592
a7c4996b AL	593	n = (VirtIONet *)virtio_init_pci(bus, "virtio-net",
	594	PCI_VENDOR_ID_REDHAT_QUMRANET,
	595	PCI_DEVICE_ID_VIRTIO_NET,
99b3718e AL	596	PCI_VENDOR_ID_REDHAT_QUMRANET,
99b3718e AL	597	VIRTIO_ID_NET,
173a543b	598	PCI_CLASS_NETWORK_ETHERNET, 0x00,
554c97dd AL	599	sizeof(struct virtio_net_config),
554c97dd AL	600	sizeof(VirtIONet));
fbe78f4f	601	if (!n)
72da4208	602	return NULL;
fbe78f4f	603
0f03eca6 AL	604	n->vdev.get_config = virtio_net_get_config;
0f03eca6 AL	605	n->vdev.set_config = virtio_net_set_config;
fbe78f4f AL	606	n->vdev.get_features = virtio_net_get_features;
fbe78f4f AL	607	n->vdev.set_features = virtio_net_set_features;
c61ad618	608	n->vdev.bad_features = virtio_net_bad_features;
002437cd	609	n->vdev.reset = virtio_net_reset;
fbe78f4f AL	610	n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
fbe78f4f AL	611	n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
3d11d36c	612	n->ctrl_vq = virtio_add_queue(&n->vdev, 16, virtio_net_handle_ctrl);
79674068	613	memcpy(n->mac, nd->macaddr, ETH_ALEN);
554c97dd	614	n->status = VIRTIO_NET_S_LINK_UP;
7a9f6e4a	615	n->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
a34b6eb7 AL	616	virtio_net_receive,
	617	virtio_net_can_receive,
	618	virtio_net_cleanup, n);
554c97dd	619	n->vc->link_status_changed = virtio_net_set_link_status;
fbe78f4f	620
96d5e201 AL	621	qemu_format_nic_info_str(n->vc, n->mac);
96d5e201 AL	622
fbe78f4f AL	623	n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
	624	n->tx_timer_active = 0;
	625	n->mergeable_rx_bufs = 0;
002437cd	626	n->promisc = 1; /* for compatibility */
fbe78f4f	627
b6503ed9	628	n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
b6503ed9	629
f21c0ed9	630	n->vlans = qemu_mallocz(MAX_VLAN >> 3);
f21c0ed9	631
9d6271b8	632	register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
fbe78f4f	633	virtio_net_save, virtio_net_load, n);
72da4208	634	return (PCIDevice *)n;
fbe78f4f	635	}