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    10
  20
  21 #define MAC_TABLE_ENTRIES    64
  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     uint8_t alluni;
  39     uint8_t nomulti;
  40     uint8_t nouni;
  41     uint8_t nobcast;
  42     struct {
  43         int in_use;
  44         int first_multi;
  45         uint8_t multi_overflow;
  46         uint8_t uni_overflow;
  47         uint8_t *macs;
  48     } mac_table;
  49     uint32_t *vlans;
  50 } VirtIONet;
  51
  52 /* TODO
  53  * - we could suppress RX interrupt if we were so inclined.
  54  */
  55
  56 static VirtIONet *to_virtio_net(VirtIODevice *vdev)
  57 {
  58     return (VirtIONet *)vdev;
  59 }
  60
  61 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
  62 {
  63     VirtIONet *n = to_virtio_net(vdev);
  64     struct virtio_net_config netcfg;
  65
  66     netcfg.status = n->status;
  67     memcpy(netcfg.mac, n->mac, ETH_ALEN);
  68     memcpy(config, &netcfg, sizeof(netcfg));
  69 }
  70
  71 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
  72 {
  73     VirtIONet *n = to_virtio_net(vdev);
  74     struct virtio_net_config netcfg;
  75
  76     memcpy(&netcfg, config, sizeof(netcfg));
  77
  78     if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
  79         memcpy(n->mac, netcfg.mac, ETH_ALEN);
  80         qemu_format_nic_info_str(n->vc, n->mac);
  81     }
  82 }
  83
  84 static void virtio_net_set_link_status(VLANClientState *vc)
  85 {
  86     VirtIONet *n = vc->opaque;
  87     uint16_t old_status = n->status;
  88
  89     if (vc->link_down)
  90         n->status &= ~VIRTIO_NET_S_LINK_UP;
  91     else
  92         n->status |= VIRTIO_NET_S_LINK_UP;
  93
  94     if (n->status != old_status)
  95         virtio_notify_config(&n->vdev);
  96 }
  97
  98 static void virtio_net_reset(VirtIODevice *vdev)
  99 {
 100     VirtIONet *n = to_virtio_net(vdev);
 101
 102     /* Reset back to compatibility mode */
 103     n->promisc = 1;
 104     n->allmulti = 0;
 105     n->alluni = 0;
 106     n->nomulti = 0;
 107     n->nouni = 0;
 108     n->nobcast = 0;
 109
 110     /* Flush any MAC and VLAN filter table state */
 111     n->mac_table.in_use = 0;
 112     n->mac_table.first_multi = 0;
 113     n->mac_table.multi_overflow = 0;
 114     n->mac_table.uni_overflow = 0;
 115     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 116     memset(n->vlans, 0, MAX_VLAN >> 3);
 117 }
 118
 119 static uint32_t virtio_net_get_features(VirtIODevice *vdev)
 120 {
 121     uint32_t features = (1 << VIRTIO_NET_F_MAC) |
 122                         (1 << VIRTIO_NET_F_MRG_RXBUF) |
 123                         (1 << VIRTIO_NET_F_STATUS) |
 124                         (1 << VIRTIO_NET_F_CTRL_VQ) |
 125                         (1 << VIRTIO_NET_F_CTRL_RX) |
 126                         (1 << VIRTIO_NET_F_CTRL_VLAN) |
 127                         (1 << VIRTIO_NET_F_CTRL_RX_EXTRA);
 128
 129     return features;
 130 }
 131
 132 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
 133 {
 134     uint32_t features = 0;
 135
 136     /* Linux kernel 2.6.25.  It understood MAC (as everyone must),
 137      * but also these: */
 138     features |= (1 << VIRTIO_NET_F_MAC);
 139     features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
 140     features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
 141     features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
 142     features |= (1 << VIRTIO_NET_F_GUEST_ECN);
 143
 144     return features & virtio_net_get_features(vdev);
 145 }
 146
 147 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
 148 {
 149     VirtIONet *n = to_virtio_net(vdev);
 150
 151     n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
 152 }
 153
 154 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
 155                                      VirtQueueElement *elem)
 156 {
 157     uint8_t on;
 158
 159     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
 160         fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
 161         exit(1);
 162     }
 163
 164     on = ldub_p(elem->out_sg[1].iov_base);
 165
 166     if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
 167         n->promisc = on;
 168     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
 169         n->allmulti = on;
 170     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI)
 171         n->alluni = on;
 172     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI)
 173         n->nomulti = on;
 174     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI)
 175         n->nouni = on;
 176     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST)
 177         n->nobcast = on;
 178     else
 179         return VIRTIO_NET_ERR;
 180
 181     return VIRTIO_NET_OK;
 182 }
 183
 184 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
 185                                  VirtQueueElement *elem)
 186 {
 187     struct virtio_net_ctrl_mac mac_data;
 188
 189     if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
 190         elem->out_sg[1].iov_len < sizeof(mac_data) ||
 191         elem->out_sg[2].iov_len < sizeof(mac_data))
 192         return VIRTIO_NET_ERR;
 193
 194     n->mac_table.in_use = 0;
 195     n->mac_table.first_multi = 0;
 196     n->mac_table.uni_overflow = 0;
 197     n->mac_table.multi_overflow = 0;
 198     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 199
 200     mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
 201
 202     if (sizeof(mac_data.entries) +
 203         (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
 204         return VIRTIO_NET_ERR;
 205
 206     if (mac_data.entries <= MAC_TABLE_ENTRIES) {
 207         memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
 208                mac_data.entries * ETH_ALEN);
 209         n->mac_table.in_use += mac_data.entries;
 210     } else {
 211         n->mac_table.uni_overflow = 1;
 212     }
 213
 214     n->mac_table.first_multi = n->mac_table.in_use;
 215
 216     mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
 217
 218     if (sizeof(mac_data.entries) +
 219         (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
 220         return VIRTIO_NET_ERR;
 221
 222     if (mac_data.entries) {
 223         if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
 224             memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
 225                    elem->out_sg[2].iov_base + sizeof(mac_data),
 226                    mac_data.entries * ETH_ALEN);
 227             n->mac_table.in_use += mac_data.entries;
 228         } else {
 229             n->mac_table.multi_overflow = 1;
 230         }
 231     }
 232
 233     return VIRTIO_NET_OK;
 234 }
 235
 236 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
 237                                         VirtQueueElement *elem)
 238 {
 239     uint16_t vid;
 240
 241     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
 242         fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
 243         return VIRTIO_NET_ERR;
 244     }
 245
 246     vid = lduw_le_p(elem->out_sg[1].iov_base);
 247
 248     if (vid >= MAX_VLAN)
 249         return VIRTIO_NET_ERR;
 250
 251     if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
 252         n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
 253     else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
 254         n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
 255     else
 256         return VIRTIO_NET_ERR;
 257
 258     return VIRTIO_NET_OK;
 259 }
 260
 261 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 262 {
 263     VirtIONet *n = to_virtio_net(vdev);
 264     struct virtio_net_ctrl_hdr ctrl;
 265     virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
 266     VirtQueueElement elem;
 267
 268     while (virtqueue_pop(vq, &elem)) {
 269         if ((elem.in_num < 1) || (elem.out_num < 1)) {
 270             fprintf(stderr, "virtio-net ctrl missing headers\n");
 271             exit(1);
 272         }
 273
 274         if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
 275             elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
 276             fprintf(stderr, "virtio-net ctrl header not in correct element\n");
 277             exit(1);
 278         }
 279
 280         ctrl.class = ldub_p(elem.out_sg[0].iov_base);
 281         ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
 282
 283         if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
 284             status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
 285         else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
 286             status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
 287         else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
 288             status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
 289
 290         stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
 291
 292         virtqueue_push(vq, &elem, sizeof(status));
 293         virtio_notify(vdev, vq);
 294     }
 295 }
 296
 297 /* RX */
 298
 299 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
 300 {
 301     VirtIONet *n = to_virtio_net(vdev);
 302
 303     qemu_flush_queued_packets(n->vc);
 304 }
 305
 306 static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
 307 {
 308     if (!virtio_queue_ready(n->rx_vq) ||
 309         !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 310         return 0;
 311
 312     if (virtio_queue_empty(n->rx_vq) ||
 313         (n->mergeable_rx_bufs &&
 314          !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
 315         virtio_queue_set_notification(n->rx_vq, 1);
 316         return 0;
 317     }
 318
 319     virtio_queue_set_notification(n->rx_vq, 0);
 320     return 1;
 321 }
 322
 323 static int virtio_net_can_receive(VLANClientState *vc)
 324 {
 325     VirtIONet *n = vc->opaque;
 326
 327     return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
 328 }
 329
 330 static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
 331 {
 332     int offset, i;
 333
 334     offset = i = 0;
 335     while (offset < count && i < iovcnt) {
 336         int len = MIN(iov[i].iov_len, count - offset);
 337         memcpy(iov[i].iov_base, buf + offset, len);
 338         offset += len;
 339         i++;
 340     }
 341
 342     return offset;
 343 }
 344
 345 static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
 346                           const void *buf, size_t size, size_t hdr_len)
 347 {
 348     struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base;
 349     int offset = 0;
 350
 351     hdr->flags = 0;
 352     hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
 353
 354     /* We only ever receive a struct virtio_net_hdr from the tapfd,
 355      * but we may be passing along a larger header to the guest.
 356      */
 357     iov[0].iov_base += hdr_len;
 358     iov[0].iov_len  -= hdr_len;
 359
 360     return offset;
 361 }
 362
 363 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
 364 {
 365     static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 366     static const uint8_t vlan[] = {0x81, 0x00};
 367     uint8_t *ptr = (uint8_t *)buf;
 368     int i;
 369
 370     if (n->promisc)
 371         return 1;
 372
 373     if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
 374         int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
 375         if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
 376             return 0;
 377     }
 378
 379     if (ptr[0] & 1) { // multicast
 380         if (!memcmp(ptr, bcast, sizeof(bcast))) {
 381             return !n->nobcast;
 382         } else if (n->nomulti) {
 383             return 0;
 384         } else if (n->allmulti || n->mac_table.multi_overflow) {
 385             return 1;
 386         }
 387
 388         for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
 389             if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
 390                 return 1;
 391             }
 392         }
 393     } else { // unicast
 394         if (n->nouni) {
 395             return 0;
 396         } else if (n->alluni || n->mac_table.uni_overflow) {
 397             return 1;
 398         } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
 399             return 1;
 400         }
 401
 402         for (i = 0; i < n->mac_table.first_multi; i++) {
 403             if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
 404                 return 1;
 405             }
 406         }
 407     }
 408
 409     return 0;
 410 }
 411
 412 static ssize_t virtio_net_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
 413 {
 414     VirtIONet *n = vc->opaque;
 415     struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
 416     size_t hdr_len, offset, i;
 417
 418     if (!do_virtio_net_can_receive(n, size))
 419         return 0;
 420
 421     if (!receive_filter(n, buf, size))
 422         return size;
 423
 424     /* hdr_len refers to the header we supply to the guest */
 425     hdr_len = n->mergeable_rx_bufs ?
 426         sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
 427
 428     offset = i = 0;
 429
 430     while (offset < size) {
 431         VirtQueueElement elem;
 432         int len, total;
 433         struct iovec sg[VIRTQUEUE_MAX_SIZE];
 434
 435         len = total = 0;
 436
 437         if ((i != 0 && !n->mergeable_rx_bufs) ||
 438             virtqueue_pop(n->rx_vq, &elem) == 0) {
 439             if (i == 0)
 440                 return -1;
 441             fprintf(stderr, "virtio-net truncating packet\n");
 442             exit(1);
 443         }
 444
 445         if (elem.in_num < 1) {
 446             fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
 447             exit(1);
 448         }
 449
 450         if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
 451             fprintf(stderr, "virtio-net header not in first element\n");
 452             exit(1);
 453         }
 454
 455         memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
 456
 457         if (i == 0) {
 458             if (n->mergeable_rx_bufs)
 459                 mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
 460
 461             offset += receive_header(n, sg, elem.in_num,
 462                                      buf + offset, size - offset, hdr_len);
 463             total += hdr_len;
 464         }
 465
 466         /* copy in packet.  ugh */
 467         len = iov_fill(sg, elem.in_num,
 468                        buf + offset, size - offset);
 469         total += len;
 470
 471         /* signal other side */
 472         virtqueue_fill(n->rx_vq, &elem, total, i++);
 473
 474         offset += len;
 475     }
 476
 477     if (mhdr)
 478         mhdr->num_buffers = i;
 479
 480     virtqueue_flush(n->rx_vq, i);
 481     virtio_notify(&n->vdev, n->rx_vq);
 482
 483     return size;
 484 }
 485
 486 /* TX */
 487 static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
 488 {
 489     VirtQueueElement elem;
 490     int has_vnet_hdr = 0;
 491
 492     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 493         return;
 494
 495     while (virtqueue_pop(vq, &elem)) {
 496         ssize_t len = 0;
 497         unsigned int out_num = elem.out_num;
 498         struct iovec *out_sg = &elem.out_sg[0];
 499         unsigned hdr_len;
 500
 501         /* hdr_len refers to the header received from the guest */
 502         hdr_len = n->mergeable_rx_bufs ?
 503             sizeof(struct virtio_net_hdr_mrg_rxbuf) :
 504             sizeof(struct virtio_net_hdr);
 505
 506         if (out_num < 1 || out_sg->iov_len != hdr_len) {
 507             fprintf(stderr, "virtio-net header not in first element\n");
 508             exit(1);
 509         }
 510
 511         /* ignore the header if GSO is not supported */
 512         if (!has_vnet_hdr) {
 513             out_num--;
 514             out_sg++;
 515             len += hdr_len;
 516         } else if (n->mergeable_rx_bufs) {
 517             /* tapfd expects a struct virtio_net_hdr */
 518             hdr_len -= sizeof(struct virtio_net_hdr);
 519             out_sg->iov_len -= hdr_len;
 520             len += hdr_len;
 521         }
 522
 523         len += qemu_sendv_packet(n->vc, out_sg, out_num);
 524
 525         virtqueue_push(vq, &elem, len);
 526         virtio_notify(&n->vdev, vq);
 527     }
 528 }
 529
 530 static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
 531 {
 532     VirtIONet *n = to_virtio_net(vdev);
 533
 534     if (n->tx_timer_active) {
 535         virtio_queue_set_notification(vq, 1);
 536         qemu_del_timer(n->tx_timer);
 537         n->tx_timer_active = 0;
 538         virtio_net_flush_tx(n, vq);
 539     } else {
 540         qemu_mod_timer(n->tx_timer,
 541                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 542         n->tx_timer_active = 1;
 543         virtio_queue_set_notification(vq, 0);
 544     }
 545 }
 546
 547 static void virtio_net_tx_timer(void *opaque)
 548 {
 549     VirtIONet *n = opaque;
 550
 551     n->tx_timer_active = 0;
 552
 553     /* Just in case the driver is not ready on more */
 554     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 555         return;
 556
 557     virtio_queue_set_notification(n->tx_vq, 1);
 558     virtio_net_flush_tx(n, n->tx_vq);
 559 }
 560
 561 static void virtio_net_save(QEMUFile *f, void *opaque)
 562 {
 563     VirtIONet *n = opaque;
 564
 565     virtio_save(&n->vdev, f);
 566
 567     qemu_put_buffer(f, n->mac, ETH_ALEN);
 568     qemu_put_be32(f, n->tx_timer_active);
 569     qemu_put_be32(f, n->mergeable_rx_bufs);
 570     qemu_put_be16(f, n->status);
 571     qemu_put_byte(f, n->promisc);
 572     qemu_put_byte(f, n->allmulti);
 573     qemu_put_be32(f, n->mac_table.in_use);
 574     qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
 575     qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 576     qemu_put_be32(f, 0); /* vnet-hdr placeholder */
 577     qemu_put_byte(f, n->mac_table.multi_overflow);
 578     qemu_put_byte(f, n->mac_table.uni_overflow);
 579     qemu_put_byte(f, n->alluni);
 580     qemu_put_byte(f, n->nomulti);
 581     qemu_put_byte(f, n->nouni);
 582     qemu_put_byte(f, n->nobcast);
 583 }
 584
 585 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
 586 {
 587     VirtIONet *n = opaque;
 588     int i;
 589
 590     if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
 591         return -EINVAL;
 592
 593     virtio_load(&n->vdev, f);
 594
 595     qemu_get_buffer(f, n->mac, ETH_ALEN);
 596     n->tx_timer_active = qemu_get_be32(f);
 597     n->mergeable_rx_bufs = qemu_get_be32(f);
 598
 599     if (version_id >= 3)
 600         n->status = qemu_get_be16(f);
 601
 602     if (version_id >= 4) {
 603         if (version_id < 8) {
 604             n->promisc = qemu_get_be32(f);
 605             n->allmulti = qemu_get_be32(f);
 606         } else {
 607             n->promisc = qemu_get_byte(f);
 608             n->allmulti = qemu_get_byte(f);
 609         }
 610     }
 611
 612     if (version_id >= 5) {
 613         n->mac_table.in_use = qemu_get_be32(f);
 614         /* MAC_TABLE_ENTRIES may be different from the saved image */
 615         if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
 616             qemu_get_buffer(f, n->mac_table.macs,
 617                             n->mac_table.in_use * ETH_ALEN);
 618         } else if (n->mac_table.in_use) {
 619             qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
 620             n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
 621             n->mac_table.in_use = 0;
 622         }
 623     }
 624
 625     if (version_id >= 6)
 626         qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 627
 628     if (version_id >= 7 && qemu_get_be32(f)) {
 629         fprintf(stderr,
 630                 "virtio-net: saved image requires vnet header support\n");
 631         exit(1);
 632     }
 633
 634     if (version_id >= 9) {
 635         n->mac_table.multi_overflow = qemu_get_byte(f);
 636         n->mac_table.uni_overflow = qemu_get_byte(f);
 637     }
 638
 639     if (version_id >= 10) {
 640         n->alluni = qemu_get_byte(f);
 641         n->nomulti = qemu_get_byte(f);
 642         n->nouni = qemu_get_byte(f);
 643         n->nobcast = qemu_get_byte(f);
 644     }
 645
 646     /* Find the first multicast entry in the saved MAC filter */
 647     for (i = 0; i < n->mac_table.in_use; i++) {
 648         if (n->mac_table.macs[i * ETH_ALEN] & 1) {
 649             break;
 650         }
 651     }
 652     n->mac_table.first_multi = i;
 653
 654     if (n->tx_timer_active) {
 655         qemu_mod_timer(n->tx_timer,
 656                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 657     }
 658
 659     return 0;
 660 }
 661
 662 static void virtio_net_cleanup(VLANClientState *vc)
 663 {
 664     VirtIONet *n = vc->opaque;
 665
 666     unregister_savevm("virtio-net", n);
 667
 668     qemu_free(n->mac_table.macs);
 669     qemu_free(n->vlans);
 670
 671     qemu_del_timer(n->tx_timer);
 672     qemu_free_timer(n->tx_timer);
 673
 674     virtio_cleanup(&n->vdev);
 675 }
 676
 677 VirtIODevice *virtio_net_init(DeviceState *dev)
 678 {
 679     VirtIONet *n;
 680     static int virtio_net_id;
 681
 682     n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
 683                                         sizeof(struct virtio_net_config),
 684                                         sizeof(VirtIONet));
 685
 686     n->vdev.get_config = virtio_net_get_config;
 687     n->vdev.set_config = virtio_net_set_config;
 688     n->vdev.get_features = virtio_net_get_features;
 689     n->vdev.set_features = virtio_net_set_features;
 690     n->vdev.bad_features = virtio_net_bad_features;
 691     n->vdev.reset = virtio_net_reset;
 692     n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
 693     n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
 694     n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
 695     qdev_get_macaddr(dev, n->mac);
 696     n->status = VIRTIO_NET_S_LINK_UP;
 697     n->vc = qdev_get_vlan_client(dev,
 698                                  virtio_net_can_receive,
 699                                  virtio_net_receive, NULL,
 700                                  virtio_net_cleanup, n);
 701     n->vc->link_status_changed = virtio_net_set_link_status;
 702
 703     qemu_format_nic_info_str(n->vc, n->mac);
 704
 705     n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
 706     n->tx_timer_active = 0;
 707     n->mergeable_rx_bufs = 0;
 708     n->promisc = 1; /* for compatibility */
 709
 710     n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
 711
 712     n->vlans = qemu_mallocz(MAX_VLAN >> 3);
 713
 714     register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
 715                     virtio_net_save, virtio_net_load, n);
 716
 717     return &n->vdev;
 718 }