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