hw/virtio-net.c

   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
  19 #define VIRTIO_NET_VM_VERSION    9
  20
  21 #define MAC_TABLE_ENTRIES    32
  22 #define MAX_VLAN    (1 << 12)   /* Per 802.1Q definition */
  23
  24 typedef struct VirtIONet
  25 {
  26     VirtIODevice vdev;
  27     uint8_t mac[ETH_ALEN];
  28     uint16_t status;
  29     VirtQueue *rx_vq;
  30     VirtQueue *tx_vq;
  31     VirtQueue *ctrl_vq;
  32     VLANClientState *vc;
  33     QEMUTimer *tx_timer;
  34     int tx_timer_active;
  35     int mergeable_rx_bufs;
  36     uint8_t promisc;
  37     uint8_t allmulti;
  38     struct {
  39         int in_use;
  40         uint8_t multi_overflow;
  41         uint8_t uni_overflow;
  42         uint8_t *macs;
  43     } mac_table;
  44     uint32_t *vlans;
  45 } VirtIONet;
  46
  47 /* TODO
  48  * - we could suppress RX interrupt if we were so inclined.
  49  */
  50
  51 static VirtIONet *to_virtio_net(VirtIODevice *vdev)
  52 {
  53     return (VirtIONet *)vdev;
  54 }
  55
  56 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
  57 {
  58     VirtIONet *n = to_virtio_net(vdev);
  59     struct virtio_net_config netcfg;
  60
  61     netcfg.status = n->status;
  62     memcpy(netcfg.mac, n->mac, ETH_ALEN);
  63     memcpy(config, &netcfg, sizeof(netcfg));
  64 }
  65
  66 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
  67 {
  68     VirtIONet *n = to_virtio_net(vdev);
  69     struct virtio_net_config netcfg;
  70
  71     memcpy(&netcfg, config, sizeof(netcfg));
  72
  73     if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
  74         memcpy(n->mac, netcfg.mac, ETH_ALEN);
  75         qemu_format_nic_info_str(n->vc, n->mac);
  76     }
  77 }
  78
  79 static void virtio_net_set_link_status(VLANClientState *vc)
  80 {
  81     VirtIONet *n = vc->opaque;
  82     uint16_t old_status = n->status;
  83
  84     if (vc->link_down)
  85         n->status &= ~VIRTIO_NET_S_LINK_UP;
  86     else
  87         n->status |= VIRTIO_NET_S_LINK_UP;
  88
  89     if (n->status != old_status)
  90         virtio_notify_config(&n->vdev);
  91 }
  92
  93 static void virtio_net_reset(VirtIODevice *vdev)
  94 {
  95     VirtIONet *n = to_virtio_net(vdev);
  96
  97     /* Reset back to compatibility mode */
  98     n->promisc = 1;
  99     n->allmulti = 0;
 100
 101     /* Flush any MAC and VLAN filter table state */
 102     n->mac_table.in_use = 0;
 103     n->mac_table.multi_overflow = 0;
 104     n->mac_table.uni_overflow = 0;
 105     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 106     memset(n->vlans, 0, MAX_VLAN >> 3);
 107 }
 108
 109 static uint32_t virtio_net_get_features(VirtIODevice *vdev)
 110 {
 111     uint32_t features = (1 << VIRTIO_NET_F_MAC) |
 112                         (1 << VIRTIO_NET_F_STATUS) |
 113                         (1 << VIRTIO_NET_F_CTRL_VQ) |
 114                         (1 << VIRTIO_NET_F_CTRL_RX) |
 115                         (1 << VIRTIO_NET_F_CTRL_VLAN);
 116
 117     return features;
 118 }
 119
 120 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
 121 {
 122     uint32_t features = 0;
 123
 124     /* Linux kernel 2.6.25.  It understood MAC (as everyone must),
 125      * but also these: */
 126     features |= (1 << VIRTIO_NET_F_MAC);
 127     features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
 128     features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
 129     features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
 130     features |= (1 << VIRTIO_NET_F_GUEST_ECN);
 131
 132     return features & virtio_net_get_features(vdev);
 133 }
 134
 135 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
 136 {
 137     VirtIONet *n = to_virtio_net(vdev);
 138
 139     n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
 140 }
 141
 142 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
 143                                      VirtQueueElement *elem)
 144 {
 145     uint8_t on;
 146
 147     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
 148         fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
 149         exit(1);
 150     }
 151
 152     on = ldub_p(elem->out_sg[1].iov_base);
 153
 154     if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
 155         n->promisc = on;
 156     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
 157         n->allmulti = on;
 158     else
 159         return VIRTIO_NET_ERR;
 160
 161     return VIRTIO_NET_OK;
 162 }
 163
 164 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
 165                                  VirtQueueElement *elem)
 166 {
 167     struct virtio_net_ctrl_mac mac_data;
 168
 169     if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
 170         elem->out_sg[1].iov_len < sizeof(mac_data) ||
 171         elem->out_sg[2].iov_len < sizeof(mac_data))
 172         return VIRTIO_NET_ERR;
 173
 174     n->mac_table.in_use = 0;
 175     n->mac_table.uni_overflow = 0;
 176     n->mac_table.multi_overflow = 0;
 177     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 178
 179     mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
 180
 181     if (sizeof(mac_data.entries) +
 182         (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
 183         return VIRTIO_NET_ERR;
 184
 185     if (mac_data.entries <= MAC_TABLE_ENTRIES) {
 186         memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
 187                mac_data.entries * ETH_ALEN);
 188         n->mac_table.in_use += mac_data.entries;
 189     } else {
 190         n->mac_table.uni_overflow = 1;
 191     }
 192
 193     mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
 194
 195     if (sizeof(mac_data.entries) +
 196         (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
 197         return VIRTIO_NET_ERR;
 198
 199     if (mac_data.entries) {
 200         if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
 201             memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
 202                    elem->out_sg[2].iov_base + sizeof(mac_data),
 203                    mac_data.entries * ETH_ALEN);
 204             n->mac_table.in_use += mac_data.entries;
 205         } else {
 206             n->mac_table.multi_overflow = 1;
 207         }
 208     }
 209
 210     return VIRTIO_NET_OK;
 211 }
 212
 213 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
 214                                         VirtQueueElement *elem)
 215 {
 216     uint16_t vid;
 217
 218     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
 219         fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
 220         return VIRTIO_NET_ERR;
 221     }
 222
 223     vid = lduw_le_p(elem->out_sg[1].iov_base);
 224
 225     if (vid >= MAX_VLAN)
 226         return VIRTIO_NET_ERR;
 227
 228     if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
 229         n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
 230     else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
 231         n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
 232     else
 233         return VIRTIO_NET_ERR;
 234
 235     return VIRTIO_NET_OK;
 236 }
 237
 238 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 239 {
 240     VirtIONet *n = to_virtio_net(vdev);
 241     struct virtio_net_ctrl_hdr ctrl;
 242     virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
 243     VirtQueueElement elem;
 244
 245     while (virtqueue_pop(vq, &elem)) {
 246         if ((elem.in_num < 1) || (elem.out_num < 1)) {
 247             fprintf(stderr, "virtio-net ctrl missing headers\n");
 248             exit(1);
 249         }
 250
 251         if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
 252             elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
 253             fprintf(stderr, "virtio-net ctrl header not in correct element\n");
 254             exit(1);
 255         }
 256
 257         ctrl.class = ldub_p(elem.out_sg[0].iov_base);
 258         ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
 259
 260         if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
 261             status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
 262         else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
 263             status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
 264         else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
 265             status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
 266
 267         stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
 268
 269         virtqueue_push(vq, &elem, sizeof(status));
 270         virtio_notify(vdev, vq);
 271     }
 272 }
 273
 274 /* RX */
 275
 276 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
 277 {
 278     VirtIONet *n = to_virtio_net(vdev);
 279
 280     qemu_flush_queued_packets(n->vc);
 281 }
 282
 283 static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
 284 {
 285     if (!virtio_queue_ready(n->rx_vq) ||
 286         !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 287         return 0;
 288
 289     if (virtio_queue_empty(n->rx_vq) ||
 290         (n->mergeable_rx_bufs &&
 291          !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
 292         virtio_queue_set_notification(n->rx_vq, 1);
 293         return 0;
 294     }
 295
 296     virtio_queue_set_notification(n->rx_vq, 0);
 297     return 1;
 298 }
 299
 300 static int virtio_net_can_receive(VLANClientState *vc)
 301 {
 302     VirtIONet *n = vc->opaque;
 303
 304     return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
 305 }
 306
 307 static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
 308 {
 309     int offset, i;
 310
 311     offset = i = 0;
 312     while (offset < count && i < iovcnt) {
 313         int len = MIN(iov[i].iov_len, count - offset);
 314         memcpy(iov[i].iov_base, buf + offset, len);
 315         offset += len;
 316         i++;
 317     }
 318
 319     return offset;
 320 }
 321
 322 static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
 323                           const void *buf, size_t size, size_t hdr_len)
 324 {
 325     struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base;
 326     int offset = 0;
 327
 328     hdr->flags = 0;
 329     hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
 330
 331     /* We only ever receive a struct virtio_net_hdr from the tapfd,
 332      * but we may be passing along a larger header to the guest.
 333      */
 334     iov[0].iov_base += hdr_len;
 335     iov[0].iov_len  -= hdr_len;
 336
 337     return offset;
 338 }
 339
 340 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
 341 {
 342     static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 343     static const uint8_t vlan[] = {0x81, 0x00};
 344     uint8_t *ptr = (uint8_t *)buf;
 345     int i;
 346
 347     if (n->promisc)
 348         return 1;
 349
 350     if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
 351         int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
 352         if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
 353             return 0;
 354     }
 355
 356     if (ptr[0] & 1) { // multicast
 357         if (!memcmp(ptr, bcast, sizeof(bcast))) {
 358             return 1;
 359         } else if (n->allmulti || n->mac_table.multi_overflow) {
 360             return 1;
 361         }
 362     } else { // unicast
 363         if (n->mac_table.uni_overflow) {
 364             return 1;
 365         } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
 366             return 1;
 367         }
 368     }
 369
 370     for (i = 0; i < n->mac_table.in_use; i++) {
 371         if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))
 372             return 1;
 373     }
 374
 375     return 0;
 376 }
 377
 378 static ssize_t virtio_net_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
 379 {
 380     VirtIONet *n = vc->opaque;
 381     struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
 382     size_t hdr_len, offset, i;
 383
 384     if (!do_virtio_net_can_receive(n, size))
 385         return 0;
 386
 387     if (!receive_filter(n, buf, size))
 388         return size;
 389
 390     /* hdr_len refers to the header we supply to the guest */
 391     hdr_len = n->mergeable_rx_bufs ?
 392         sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
 393
 394     offset = i = 0;
 395
 396     while (offset < size) {
 397         VirtQueueElement elem;
 398         int len, total;
 399         struct iovec sg[VIRTQUEUE_MAX_SIZE];
 400
 401         len = total = 0;
 402
 403         if ((i != 0 && !n->mergeable_rx_bufs) ||
 404             virtqueue_pop(n->rx_vq, &elem) == 0) {
 405             if (i == 0)
 406                 return -1;
 407             fprintf(stderr, "virtio-net truncating packet\n");
 408             exit(1);
 409         }
 410
 411         if (elem.in_num < 1) {
 412             fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
 413             exit(1);
 414         }
 415
 416         if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
 417             fprintf(stderr, "virtio-net header not in first element\n");
 418             exit(1);
 419         }
 420
 421         memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
 422
 423         if (i == 0) {
 424             if (n->mergeable_rx_bufs)
 425                 mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
 426
 427             offset += receive_header(n, sg, elem.in_num,
 428                                      buf + offset, size - offset, hdr_len);
 429             total += hdr_len;
 430         }
 431
 432         /* copy in packet.  ugh */
 433         len = iov_fill(sg, elem.in_num,
 434                        buf + offset, size - offset);
 435         total += len;
 436
 437         /* signal other side */
 438         virtqueue_fill(n->rx_vq, &elem, total, i++);
 439
 440         offset += len;
 441     }
 442
 443     if (mhdr)
 444         mhdr->num_buffers = i;
 445
 446     virtqueue_flush(n->rx_vq, i);
 447     virtio_notify(&n->vdev, n->rx_vq);
 448
 449     return size;
 450 }
 451
 452 /* TX */
 453 static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
 454 {
 455     VirtQueueElement elem;
 456     int has_vnet_hdr = 0;
 457
 458     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 459         return;
 460
 461     while (virtqueue_pop(vq, &elem)) {
 462         ssize_t len = 0;
 463         unsigned int out_num = elem.out_num;
 464         struct iovec *out_sg = &elem.out_sg[0];
 465         unsigned hdr_len;
 466
 467         /* hdr_len refers to the header received from the guest */
 468         hdr_len = n->mergeable_rx_bufs ?
 469             sizeof(struct virtio_net_hdr_mrg_rxbuf) :
 470             sizeof(struct virtio_net_hdr);
 471
 472         if (out_num < 1 || out_sg->iov_len != hdr_len) {
 473             fprintf(stderr, "virtio-net header not in first element\n");
 474             exit(1);
 475         }
 476
 477         /* ignore the header if GSO is not supported */
 478         if (!has_vnet_hdr) {
 479             out_num--;
 480             out_sg++;
 481             len += hdr_len;
 482         } else if (n->mergeable_rx_bufs) {
 483             /* tapfd expects a struct virtio_net_hdr */
 484             hdr_len -= sizeof(struct virtio_net_hdr);
 485             out_sg->iov_len -= hdr_len;
 486             len += hdr_len;
 487         }
 488
 489         len += qemu_sendv_packet(n->vc, out_sg, out_num);
 490
 491         virtqueue_push(vq, &elem, len);
 492         virtio_notify(&n->vdev, vq);
 493     }
 494 }
 495
 496 static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
 497 {
 498     VirtIONet *n = to_virtio_net(vdev);
 499
 500     if (n->tx_timer_active) {
 501         virtio_queue_set_notification(vq, 1);
 502         qemu_del_timer(n->tx_timer);
 503         n->tx_timer_active = 0;
 504         virtio_net_flush_tx(n, vq);
 505     } else {
 506         qemu_mod_timer(n->tx_timer,
 507                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 508         n->tx_timer_active = 1;
 509         virtio_queue_set_notification(vq, 0);
 510     }
 511 }
 512
 513 static void virtio_net_tx_timer(void *opaque)
 514 {
 515     VirtIONet *n = opaque;
 516
 517     n->tx_timer_active = 0;
 518
 519     /* Just in case the driver is not ready on more */
 520     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 521         return;
 522
 523     virtio_queue_set_notification(n->tx_vq, 1);
 524     virtio_net_flush_tx(n, n->tx_vq);
 525 }
 526
 527 static void virtio_net_save(QEMUFile *f, void *opaque)
 528 {
 529     VirtIONet *n = opaque;
 530
 531     virtio_save(&n->vdev, f);
 532
 533     qemu_put_buffer(f, n->mac, ETH_ALEN);
 534     qemu_put_be32(f, n->tx_timer_active);
 535     qemu_put_be32(f, n->mergeable_rx_bufs);
 536     qemu_put_be16(f, n->status);
 537     qemu_put_byte(f, n->promisc);
 538     qemu_put_byte(f, n->allmulti);
 539     qemu_put_be32(f, n->mac_table.in_use);
 540     qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
 541     qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 542     qemu_put_be32(f, 0); /* vnet-hdr placeholder */
 543     qemu_put_byte(f, n->mac_table.multi_overflow);
 544     qemu_put_byte(f, n->mac_table.uni_overflow);
 545 }
 546
 547 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
 548 {
 549     VirtIONet *n = opaque;
 550
 551     if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
 552         return -EINVAL;
 553
 554     virtio_load(&n->vdev, f);
 555
 556     qemu_get_buffer(f, n->mac, ETH_ALEN);
 557     n->tx_timer_active = qemu_get_be32(f);
 558     n->mergeable_rx_bufs = qemu_get_be32(f);
 559
 560     if (version_id >= 3)
 561         n->status = qemu_get_be16(f);
 562
 563     if (version_id >= 4) {
 564         if (version_id < 8) {
 565             n->promisc = qemu_get_be32(f);
 566             n->allmulti = qemu_get_be32(f);
 567         } else {
 568             n->promisc = qemu_get_byte(f);
 569             n->allmulti = qemu_get_byte(f);
 570         }
 571     }
 572
 573     if (version_id >= 5) {
 574         n->mac_table.in_use = qemu_get_be32(f);
 575         /* MAC_TABLE_ENTRIES may be different from the saved image */
 576         if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
 577             qemu_get_buffer(f, n->mac_table.macs,
 578                             n->mac_table.in_use * ETH_ALEN);
 579         } else if (n->mac_table.in_use) {
 580             qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
 581             n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
 582             n->mac_table.in_use = 0;
 583         }
 584     }
 585
 586     if (version_id >= 6)
 587         qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 588
 589     if (version_id >= 7 && qemu_get_be32(f)) {
 590         fprintf(stderr,
 591                 "virtio-net: saved image requires vnet header support\n");
 592         exit(1);
 593     }
 594
 595     if (version_id >= 9) {
 596         n->mac_table.multi_overflow = qemu_get_byte(f);
 597         n->mac_table.uni_overflow = qemu_get_byte(f);
 598     }
 599
 600     if (n->tx_timer_active) {
 601         qemu_mod_timer(n->tx_timer,
 602                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 603     }
 604
 605     return 0;
 606 }
 607
 608 static void virtio_net_cleanup(VLANClientState *vc)
 609 {
 610     VirtIONet *n = vc->opaque;
 611
 612     unregister_savevm("virtio-net", n);
 613
 614     qemu_free(n->mac_table.macs);
 615     qemu_free(n->vlans);
 616
 617     qemu_del_timer(n->tx_timer);
 618     qemu_free_timer(n->tx_timer);
 619
 620     virtio_cleanup(&n->vdev);
 621 }
 622
 623 VirtIODevice *virtio_net_init(DeviceState *dev)
 624 {
 625     VirtIONet *n;
 626     static int virtio_net_id;
 627
 628     n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
 629                                         sizeof(struct virtio_net_config),
 630                                         sizeof(VirtIONet));
 631
 632     n->vdev.get_config = virtio_net_get_config;
 633     n->vdev.set_config = virtio_net_set_config;
 634     n->vdev.get_features = virtio_net_get_features;
 635     n->vdev.set_features = virtio_net_set_features;
 636     n->vdev.bad_features = virtio_net_bad_features;
 637     n->vdev.reset = virtio_net_reset;
 638     n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
 639     n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
 640     n->ctrl_vq = virtio_add_queue(&n->vdev, 16, virtio_net_handle_ctrl);
 641     qdev_get_macaddr(dev, n->mac);
 642     n->status = VIRTIO_NET_S_LINK_UP;
 643     n->vc = qdev_get_vlan_client(dev,
 644                                  virtio_net_can_receive,
 645                                  virtio_net_receive, NULL,
 646                                  virtio_net_cleanup, n);
 647     n->vc->link_status_changed = virtio_net_set_link_status;
 648
 649     qemu_format_nic_info_str(n->vc, n->mac);
 650
 651     n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
 652     n->tx_timer_active = 0;
 653     n->mergeable_rx_bufs = 0;
 654     n->promisc = 1; /* for compatibility */
 655
 656     n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
 657
 658     n->vlans = qemu_mallocz(MAX_VLAN >> 3);
 659
 660     register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
 661                     virtio_net_save, virtio_net_load, n);
 662
 663     return &n->vdev;
 664 }