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     struct {
  36         VirtQueueElement elem;
  37         ssize_t len;
  38     } async_tx;
  39     int mergeable_rx_bufs;
  40     uint8_t promisc;
  41     uint8_t allmulti;
  42     uint8_t alluni;
  43     uint8_t nomulti;
  44     uint8_t nouni;
  45     uint8_t nobcast;
  46     struct {
  47         int in_use;
  48         int first_multi;
  49         uint8_t multi_overflow;
  50         uint8_t uni_overflow;
  51         uint8_t *macs;
  52     } mac_table;
  53     uint32_t *vlans;
  54 } VirtIONet;
  55
  56 /* TODO
  57  * - we could suppress RX interrupt if we were so inclined.
  58  */
  59
  60 static VirtIONet *to_virtio_net(VirtIODevice *vdev)
  61 {
  62     return (VirtIONet *)vdev;
  63 }
  64
  65 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
  66 {
  67     VirtIONet *n = to_virtio_net(vdev);
  68     struct virtio_net_config netcfg;
  69
  70     netcfg.status = n->status;
  71     memcpy(netcfg.mac, n->mac, ETH_ALEN);
  72     memcpy(config, &netcfg, sizeof(netcfg));
  73 }
  74
  75 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
  76 {
  77     VirtIONet *n = to_virtio_net(vdev);
  78     struct virtio_net_config netcfg;
  79
  80     memcpy(&netcfg, config, sizeof(netcfg));
  81
  82     if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
  83         memcpy(n->mac, netcfg.mac, ETH_ALEN);
  84         qemu_format_nic_info_str(n->vc, n->mac);
  85     }
  86 }
  87
  88 static void virtio_net_set_link_status(VLANClientState *vc)
  89 {
  90     VirtIONet *n = vc->opaque;
  91     uint16_t old_status = n->status;
  92
  93     if (vc->link_down)
  94         n->status &= ~VIRTIO_NET_S_LINK_UP;
  95     else
  96         n->status |= VIRTIO_NET_S_LINK_UP;
  97
  98     if (n->status != old_status)
  99         virtio_notify_config(&n->vdev);
 100 }
 101
 102 static void virtio_net_reset(VirtIODevice *vdev)
 103 {
 104     VirtIONet *n = to_virtio_net(vdev);
 105
 106     /* Reset back to compatibility mode */
 107     n->promisc = 1;
 108     n->allmulti = 0;
 109     n->alluni = 0;
 110     n->nomulti = 0;
 111     n->nouni = 0;
 112     n->nobcast = 0;
 113
 114     /* Flush any MAC and VLAN filter table state */
 115     n->mac_table.in_use = 0;
 116     n->mac_table.first_multi = 0;
 117     n->mac_table.multi_overflow = 0;
 118     n->mac_table.uni_overflow = 0;
 119     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 120     memset(n->vlans, 0, MAX_VLAN >> 3);
 121 }
 122
 123 static uint32_t virtio_net_get_features(VirtIODevice *vdev)
 124 {
 125     uint32_t features = (1 << VIRTIO_NET_F_MAC) |
 126                         (1 << VIRTIO_NET_F_MRG_RXBUF) |
 127                         (1 << VIRTIO_NET_F_STATUS) |
 128                         (1 << VIRTIO_NET_F_CTRL_VQ) |
 129                         (1 << VIRTIO_NET_F_CTRL_RX) |
 130                         (1 << VIRTIO_NET_F_CTRL_VLAN) |
 131                         (1 << VIRTIO_NET_F_CTRL_RX_EXTRA);
 132
 133     return features;
 134 }
 135
 136 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
 137 {
 138     uint32_t features = 0;
 139
 140     /* Linux kernel 2.6.25.  It understood MAC (as everyone must),
 141      * but also these: */
 142     features |= (1 << VIRTIO_NET_F_MAC);
 143     features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
 144     features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
 145     features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
 146     features |= (1 << VIRTIO_NET_F_GUEST_ECN);
 147
 148     return features & virtio_net_get_features(vdev);
 149 }
 150
 151 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
 152 {
 153     VirtIONet *n = to_virtio_net(vdev);
 154
 155     n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
 156 }
 157
 158 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
 159                                      VirtQueueElement *elem)
 160 {
 161     uint8_t on;
 162
 163     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
 164         fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
 165         exit(1);
 166     }
 167
 168     on = ldub_p(elem->out_sg[1].iov_base);
 169
 170     if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
 171         n->promisc = on;
 172     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
 173         n->allmulti = on;
 174     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLUNI)
 175         n->alluni = on;
 176     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOMULTI)
 177         n->nomulti = on;
 178     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOUNI)
 179         n->nouni = on;
 180     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_NOBCAST)
 181         n->nobcast = on;
 182     else
 183         return VIRTIO_NET_ERR;
 184
 185     return VIRTIO_NET_OK;
 186 }
 187
 188 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
 189                                  VirtQueueElement *elem)
 190 {
 191     struct virtio_net_ctrl_mac mac_data;
 192
 193     if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
 194         elem->out_sg[1].iov_len < sizeof(mac_data) ||
 195         elem->out_sg[2].iov_len < sizeof(mac_data))
 196         return VIRTIO_NET_ERR;
 197
 198     n->mac_table.in_use = 0;
 199     n->mac_table.first_multi = 0;
 200     n->mac_table.uni_overflow = 0;
 201     n->mac_table.multi_overflow = 0;
 202     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 203
 204     mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
 205
 206     if (sizeof(mac_data.entries) +
 207         (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
 208         return VIRTIO_NET_ERR;
 209
 210     if (mac_data.entries <= MAC_TABLE_ENTRIES) {
 211         memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
 212                mac_data.entries * ETH_ALEN);
 213         n->mac_table.in_use += mac_data.entries;
 214     } else {
 215         n->mac_table.uni_overflow = 1;
 216     }
 217
 218     n->mac_table.first_multi = n->mac_table.in_use;
 219
 220     mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
 221
 222     if (sizeof(mac_data.entries) +
 223         (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
 224         return VIRTIO_NET_ERR;
 225
 226     if (mac_data.entries) {
 227         if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
 228             memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
 229                    elem->out_sg[2].iov_base + sizeof(mac_data),
 230                    mac_data.entries * ETH_ALEN);
 231             n->mac_table.in_use += mac_data.entries;
 232         } else {
 233             n->mac_table.multi_overflow = 1;
 234         }
 235     }
 236
 237     return VIRTIO_NET_OK;
 238 }
 239
 240 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
 241                                         VirtQueueElement *elem)
 242 {
 243     uint16_t vid;
 244
 245     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
 246         fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
 247         return VIRTIO_NET_ERR;
 248     }
 249
 250     vid = lduw_le_p(elem->out_sg[1].iov_base);
 251
 252     if (vid >= MAX_VLAN)
 253         return VIRTIO_NET_ERR;
 254
 255     if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
 256         n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
 257     else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
 258         n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
 259     else
 260         return VIRTIO_NET_ERR;
 261
 262     return VIRTIO_NET_OK;
 263 }
 264
 265 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 266 {
 267     VirtIONet *n = to_virtio_net(vdev);
 268     struct virtio_net_ctrl_hdr ctrl;
 269     virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
 270     VirtQueueElement elem;
 271
 272     while (virtqueue_pop(vq, &elem)) {
 273         if ((elem.in_num < 1) || (elem.out_num < 1)) {
 274             fprintf(stderr, "virtio-net ctrl missing headers\n");
 275             exit(1);
 276         }
 277
 278         if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
 279             elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
 280             fprintf(stderr, "virtio-net ctrl header not in correct element\n");
 281             exit(1);
 282         }
 283
 284         ctrl.class = ldub_p(elem.out_sg[0].iov_base);
 285         ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
 286
 287         if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
 288             status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
 289         else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
 290             status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
 291         else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
 292             status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
 293
 294         stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
 295
 296         virtqueue_push(vq, &elem, sizeof(status));
 297         virtio_notify(vdev, vq);
 298     }
 299 }
 300
 301 /* RX */
 302
 303 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
 304 {
 305     VirtIONet *n = to_virtio_net(vdev);
 306
 307     qemu_flush_queued_packets(n->vc);
 308 }
 309
 310 static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
 311 {
 312     if (!virtio_queue_ready(n->rx_vq) ||
 313         !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 314         return 0;
 315
 316     if (virtio_queue_empty(n->rx_vq) ||
 317         (n->mergeable_rx_bufs &&
 318          !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
 319         virtio_queue_set_notification(n->rx_vq, 1);
 320         return 0;
 321     }
 322
 323     virtio_queue_set_notification(n->rx_vq, 0);
 324     return 1;
 325 }
 326
 327 static int virtio_net_can_receive(VLANClientState *vc)
 328 {
 329     VirtIONet *n = vc->opaque;
 330
 331     return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
 332 }
 333
 334 static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
 335 {
 336     int offset, i;
 337
 338     offset = i = 0;
 339     while (offset < count && i < iovcnt) {
 340         int len = MIN(iov[i].iov_len, count - offset);
 341         memcpy(iov[i].iov_base, buf + offset, len);
 342         offset += len;
 343         i++;
 344     }
 345
 346     return offset;
 347 }
 348
 349 static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
 350                           const void *buf, size_t size, size_t hdr_len)
 351 {
 352     struct virtio_net_hdr *hdr = (struct virtio_net_hdr *)iov[0].iov_base;
 353     int offset = 0;
 354
 355     hdr->flags = 0;
 356     hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
 357
 358     /* We only ever receive a struct virtio_net_hdr from the tapfd,
 359      * but we may be passing along a larger header to the guest.
 360      */
 361     iov[0].iov_base += hdr_len;
 362     iov[0].iov_len  -= hdr_len;
 363
 364     return offset;
 365 }
 366
 367 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
 368 {
 369     static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 370     static const uint8_t vlan[] = {0x81, 0x00};
 371     uint8_t *ptr = (uint8_t *)buf;
 372     int i;
 373
 374     if (n->promisc)
 375         return 1;
 376
 377     if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
 378         int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
 379         if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
 380             return 0;
 381     }
 382
 383     if (ptr[0] & 1) { // multicast
 384         if (!memcmp(ptr, bcast, sizeof(bcast))) {
 385             return !n->nobcast;
 386         } else if (n->nomulti) {
 387             return 0;
 388         } else if (n->allmulti || n->mac_table.multi_overflow) {
 389             return 1;
 390         }
 391
 392         for (i = n->mac_table.first_multi; i < n->mac_table.in_use; i++) {
 393             if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
 394                 return 1;
 395             }
 396         }
 397     } else { // unicast
 398         if (n->nouni) {
 399             return 0;
 400         } else if (n->alluni || n->mac_table.uni_overflow) {
 401             return 1;
 402         } else if (!memcmp(ptr, n->mac, ETH_ALEN)) {
 403             return 1;
 404         }
 405
 406         for (i = 0; i < n->mac_table.first_multi; i++) {
 407             if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN)) {
 408                 return 1;
 409             }
 410         }
 411     }
 412
 413     return 0;
 414 }
 415
 416 static ssize_t virtio_net_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
 417 {
 418     VirtIONet *n = vc->opaque;
 419     struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
 420     size_t hdr_len, offset, i;
 421
 422     if (!do_virtio_net_can_receive(n, size))
 423         return 0;
 424
 425     if (!receive_filter(n, buf, size))
 426         return size;
 427
 428     /* hdr_len refers to the header we supply to the guest */
 429     hdr_len = n->mergeable_rx_bufs ?
 430         sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
 431
 432     offset = i = 0;
 433
 434     while (offset < size) {
 435         VirtQueueElement elem;
 436         int len, total;
 437         struct iovec sg[VIRTQUEUE_MAX_SIZE];
 438
 439         len = total = 0;
 440
 441         if ((i != 0 && !n->mergeable_rx_bufs) ||
 442             virtqueue_pop(n->rx_vq, &elem) == 0) {
 443             if (i == 0)
 444                 return -1;
 445             fprintf(stderr, "virtio-net truncating packet\n");
 446             exit(1);
 447         }
 448
 449         if (elem.in_num < 1) {
 450             fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
 451             exit(1);
 452         }
 453
 454         if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
 455             fprintf(stderr, "virtio-net header not in first element\n");
 456             exit(1);
 457         }
 458
 459         memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
 460
 461         if (i == 0) {
 462             if (n->mergeable_rx_bufs)
 463                 mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
 464
 465             offset += receive_header(n, sg, elem.in_num,
 466                                      buf + offset, size - offset, hdr_len);
 467             total += hdr_len;
 468         }
 469
 470         /* copy in packet.  ugh */
 471         len = iov_fill(sg, elem.in_num,
 472                        buf + offset, size - offset);
 473         total += len;
 474
 475         /* signal other side */
 476         virtqueue_fill(n->rx_vq, &elem, total, i++);
 477
 478         offset += len;
 479     }
 480
 481     if (mhdr)
 482         mhdr->num_buffers = i;
 483
 484     virtqueue_flush(n->rx_vq, i);
 485     virtio_notify(&n->vdev, n->rx_vq);
 486
 487     return size;
 488 }
 489
 490 static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq);
 491
 492 static void virtio_net_tx_complete(VLANClientState *vc, ssize_t len)
 493 {
 494     VirtIONet *n = vc->opaque;
 495
 496     virtqueue_push(n->tx_vq, &n->async_tx.elem, n->async_tx.len);
 497     virtio_notify(&n->vdev, n->tx_vq);
 498
 499     n->async_tx.elem.out_num = n->async_tx.len = 0;
 500
 501     virtio_queue_set_notification(n->tx_vq, 1);
 502     virtio_net_flush_tx(n, n->tx_vq);
 503 }
 504
 505 /* TX */
 506 static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
 507 {
 508     VirtQueueElement elem;
 509     int has_vnet_hdr = 0;
 510
 511     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 512         return;
 513
 514     if (n->async_tx.elem.out_num) {
 515         virtio_queue_set_notification(n->tx_vq, 0);
 516         return;
 517     }
 518
 519     while (virtqueue_pop(vq, &elem)) {
 520         ssize_t ret, len = 0;
 521         unsigned int out_num = elem.out_num;
 522         struct iovec *out_sg = &elem.out_sg[0];
 523         unsigned hdr_len;
 524
 525         /* hdr_len refers to the header received from the guest */
 526         hdr_len = n->mergeable_rx_bufs ?
 527             sizeof(struct virtio_net_hdr_mrg_rxbuf) :
 528             sizeof(struct virtio_net_hdr);
 529
 530         if (out_num < 1 || out_sg->iov_len != hdr_len) {
 531             fprintf(stderr, "virtio-net header not in first element\n");
 532             exit(1);
 533         }
 534
 535         /* ignore the header if GSO is not supported */
 536         if (!has_vnet_hdr) {
 537             out_num--;
 538             out_sg++;
 539             len += hdr_len;
 540         } else if (n->mergeable_rx_bufs) {
 541             /* tapfd expects a struct virtio_net_hdr */
 542             hdr_len -= sizeof(struct virtio_net_hdr);
 543             out_sg->iov_len -= hdr_len;
 544             len += hdr_len;
 545         }
 546
 547         ret = qemu_sendv_packet_async(n->vc, out_sg, out_num,
 548                                       virtio_net_tx_complete);
 549         if (ret == 0) {
 550             virtio_queue_set_notification(n->tx_vq, 0);
 551             n->async_tx.elem = elem;
 552             n->async_tx.len  = len;
 553             return;
 554         }
 555
 556         len += ret;
 557
 558         virtqueue_push(vq, &elem, len);
 559         virtio_notify(&n->vdev, vq);
 560     }
 561 }
 562
 563 static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
 564 {
 565     VirtIONet *n = to_virtio_net(vdev);
 566
 567     if (n->tx_timer_active) {
 568         virtio_queue_set_notification(vq, 1);
 569         qemu_del_timer(n->tx_timer);
 570         n->tx_timer_active = 0;
 571         virtio_net_flush_tx(n, vq);
 572     } else {
 573         qemu_mod_timer(n->tx_timer,
 574                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 575         n->tx_timer_active = 1;
 576         virtio_queue_set_notification(vq, 0);
 577     }
 578 }
 579
 580 static void virtio_net_tx_timer(void *opaque)
 581 {
 582     VirtIONet *n = opaque;
 583
 584     n->tx_timer_active = 0;
 585
 586     /* Just in case the driver is not ready on more */
 587     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 588         return;
 589
 590     virtio_queue_set_notification(n->tx_vq, 1);
 591     virtio_net_flush_tx(n, n->tx_vq);
 592 }
 593
 594 static void virtio_net_save(QEMUFile *f, void *opaque)
 595 {
 596     VirtIONet *n = opaque;
 597
 598     virtio_save(&n->vdev, f);
 599
 600     qemu_put_buffer(f, n->mac, ETH_ALEN);
 601     qemu_put_be32(f, n->tx_timer_active);
 602     qemu_put_be32(f, n->mergeable_rx_bufs);
 603     qemu_put_be16(f, n->status);
 604     qemu_put_byte(f, n->promisc);
 605     qemu_put_byte(f, n->allmulti);
 606     qemu_put_be32(f, n->mac_table.in_use);
 607     qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
 608     qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 609     qemu_put_be32(f, 0); /* vnet-hdr placeholder */
 610     qemu_put_byte(f, n->mac_table.multi_overflow);
 611     qemu_put_byte(f, n->mac_table.uni_overflow);
 612     qemu_put_byte(f, n->alluni);
 613     qemu_put_byte(f, n->nomulti);
 614     qemu_put_byte(f, n->nouni);
 615     qemu_put_byte(f, n->nobcast);
 616 }
 617
 618 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
 619 {
 620     VirtIONet *n = opaque;
 621     int i;
 622
 623     if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
 624         return -EINVAL;
 625
 626     virtio_load(&n->vdev, f);
 627
 628     qemu_get_buffer(f, n->mac, ETH_ALEN);
 629     n->tx_timer_active = qemu_get_be32(f);
 630     n->mergeable_rx_bufs = qemu_get_be32(f);
 631
 632     if (version_id >= 3)
 633         n->status = qemu_get_be16(f);
 634
 635     if (version_id >= 4) {
 636         if (version_id < 8) {
 637             n->promisc = qemu_get_be32(f);
 638             n->allmulti = qemu_get_be32(f);
 639         } else {
 640             n->promisc = qemu_get_byte(f);
 641             n->allmulti = qemu_get_byte(f);
 642         }
 643     }
 644
 645     if (version_id >= 5) {
 646         n->mac_table.in_use = qemu_get_be32(f);
 647         /* MAC_TABLE_ENTRIES may be different from the saved image */
 648         if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
 649             qemu_get_buffer(f, n->mac_table.macs,
 650                             n->mac_table.in_use * ETH_ALEN);
 651         } else if (n->mac_table.in_use) {
 652             qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
 653             n->mac_table.multi_overflow = n->mac_table.uni_overflow = 1;
 654             n->mac_table.in_use = 0;
 655         }
 656     }
 657
 658     if (version_id >= 6)
 659         qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 660
 661     if (version_id >= 7 && qemu_get_be32(f)) {
 662         fprintf(stderr,
 663                 "virtio-net: saved image requires vnet header support\n");
 664         exit(1);
 665     }
 666
 667     if (version_id >= 9) {
 668         n->mac_table.multi_overflow = qemu_get_byte(f);
 669         n->mac_table.uni_overflow = qemu_get_byte(f);
 670     }
 671
 672     if (version_id >= 10) {
 673         n->alluni = qemu_get_byte(f);
 674         n->nomulti = qemu_get_byte(f);
 675         n->nouni = qemu_get_byte(f);
 676         n->nobcast = qemu_get_byte(f);
 677     }
 678
 679     /* Find the first multicast entry in the saved MAC filter */
 680     for (i = 0; i < n->mac_table.in_use; i++) {
 681         if (n->mac_table.macs[i * ETH_ALEN] & 1) {
 682             break;
 683         }
 684     }
 685     n->mac_table.first_multi = i;
 686
 687     if (n->tx_timer_active) {
 688         qemu_mod_timer(n->tx_timer,
 689                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 690     }
 691
 692     return 0;
 693 }
 694
 695 static void virtio_net_cleanup(VLANClientState *vc)
 696 {
 697     VirtIONet *n = vc->opaque;
 698
 699     qemu_purge_queued_packets(vc);
 700
 701     unregister_savevm("virtio-net", n);
 702
 703     qemu_free(n->mac_table.macs);
 704     qemu_free(n->vlans);
 705
 706     qemu_del_timer(n->tx_timer);
 707     qemu_free_timer(n->tx_timer);
 708
 709     virtio_cleanup(&n->vdev);
 710 }
 711
 712 VirtIODevice *virtio_net_init(DeviceState *dev)
 713 {
 714     VirtIONet *n;
 715     static int virtio_net_id;
 716
 717     n = (VirtIONet *)virtio_common_init("virtio-net", VIRTIO_ID_NET,
 718                                         sizeof(struct virtio_net_config),
 719                                         sizeof(VirtIONet));
 720
 721     n->vdev.get_config = virtio_net_get_config;
 722     n->vdev.set_config = virtio_net_set_config;
 723     n->vdev.get_features = virtio_net_get_features;
 724     n->vdev.set_features = virtio_net_set_features;
 725     n->vdev.bad_features = virtio_net_bad_features;
 726     n->vdev.reset = virtio_net_reset;
 727     n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
 728     n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
 729     n->ctrl_vq = virtio_add_queue(&n->vdev, 64, virtio_net_handle_ctrl);
 730     qdev_get_macaddr(dev, n->mac);
 731     n->status = VIRTIO_NET_S_LINK_UP;
 732     n->vc = qdev_get_vlan_client(dev,
 733                                  virtio_net_can_receive,
 734                                  virtio_net_receive, NULL,
 735                                  virtio_net_cleanup, n);
 736     n->vc->link_status_changed = virtio_net_set_link_status;
 737
 738     qemu_format_nic_info_str(n->vc, n->mac);
 739
 740     n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
 741     n->tx_timer_active = 0;
 742     n->mergeable_rx_bufs = 0;
 743     n->promisc = 1; /* for compatibility */
 744
 745     n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
 746
 747     n->vlans = qemu_mallocz(MAX_VLAN >> 3);
 748
 749     register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
 750                     virtio_net_save, virtio_net_load, n);
 751
 752     return &n->vdev;
 753 }