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 #ifdef USE_KVM
  19 #include "qemu-kvm.h"
  20 #endif
  21
  22 #define TAP_VNET_HDR
  23
  24 /* Version 7 has TAP_VNET_HDR support.  This is reserved in upstream QEMU to
  25  * avoid future conflict.
  26  * We can't assume verisons > 7 have TAP_VNET_HDR support until this is merged
  27  * in upstream QEMU.
  28  */
  29 #define VIRTIO_NET_VM_VERSION    7
  30
  31 #define MAC_TABLE_ENTRIES    32
  32 #define MAX_VLAN    (1 << 12)   /* Per 802.1Q definition */
  33
  34 typedef struct VirtIONet
  35 {
  36     VirtIODevice vdev;
  37     uint8_t mac[ETH_ALEN];
  38     uint16_t status;
  39     VirtQueue *rx_vq;
  40     VirtQueue *tx_vq;
  41     VirtQueue *ctrl_vq;
  42     VLANClientState *vc;
  43     QEMUTimer *tx_timer;
  44     int tx_timer_active;
  45     int mergeable_rx_bufs;
  46     int promisc;
  47     int allmulti;
  48     struct {
  49         int in_use;
  50         uint8_t *macs;
  51     } mac_table;
  52     uint32_t *vlans;
  53 } VirtIONet;
  54
  55 /* TODO
  56  * - we could suppress RX interrupt if we were so inclined.
  57  */
  58
  59 static VirtIONet *to_virtio_net(VirtIODevice *vdev)
  60 {
  61     return (VirtIONet *)vdev;
  62 }
  63
  64 static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
  65 {
  66     VirtIONet *n = to_virtio_net(vdev);
  67     struct virtio_net_config netcfg;
  68
  69     netcfg.status = n->status;
  70     memcpy(netcfg.mac, n->mac, ETH_ALEN);
  71     memcpy(config, &netcfg, sizeof(netcfg));
  72 }
  73
  74 static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
  75 {
  76     VirtIONet *n = to_virtio_net(vdev);
  77     struct virtio_net_config netcfg;
  78
  79     memcpy(&netcfg, config, sizeof(netcfg));
  80
  81     if (memcmp(netcfg.mac, n->mac, ETH_ALEN)) {
  82         memcpy(n->mac, netcfg.mac, ETH_ALEN);
  83         qemu_format_nic_info_str(n->vc, n->mac);
  84     }
  85 }
  86
  87 static void virtio_net_set_link_status(VLANClientState *vc)
  88 {
  89     VirtIONet *n = vc->opaque;
  90     uint16_t old_status = n->status;
  91
  92     if (vc->link_down)
  93         n->status &= ~VIRTIO_NET_S_LINK_UP;
  94     else
  95         n->status |= VIRTIO_NET_S_LINK_UP;
  96
  97     if (n->status != old_status)
  98         virtio_notify_config(&n->vdev);
  99 }
 100
 101 static void virtio_net_reset(VirtIODevice *vdev)
 102 {
 103     VirtIONet *n = to_virtio_net(vdev);
 104
 105     /* Reset back to compatibility mode */
 106     n->promisc = 1;
 107     n->allmulti = 0;
 108
 109     /* Flush any MAC and VLAN filter table state */
 110     n->mac_table.in_use = 0;
 111     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 112     memset(n->vlans, 0, MAX_VLAN >> 3);
 113 }
 114
 115 static uint32_t virtio_net_get_features(VirtIODevice *vdev)
 116 {
 117     uint32_t features = (1 << VIRTIO_NET_F_MAC) |
 118                         (1 << VIRTIO_NET_F_STATUS) |
 119                         (1 << VIRTIO_NET_F_CTRL_VQ) |
 120                         (1 << VIRTIO_NET_F_CTRL_RX) |
 121                         (1 << VIRTIO_NET_F_CTRL_VLAN);
 122 #ifdef TAP_VNET_HDR
 123     VirtIONet *n = to_virtio_net(vdev);
 124     VLANClientState *host = n->vc->vlan->first_client;
 125
 126     if (tap_has_vnet_hdr(host)) {
 127         tap_using_vnet_hdr(host, 1);
 128         features |= (1 << VIRTIO_NET_F_CSUM);
 129         features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
 130         features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
 131         features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
 132         features |= (1 << VIRTIO_NET_F_GUEST_ECN);
 133         features |= (1 << VIRTIO_NET_F_HOST_TSO4);
 134         features |= (1 << VIRTIO_NET_F_HOST_TSO6);
 135         features |= (1 << VIRTIO_NET_F_HOST_ECN);
 136         features |= (1 << VIRTIO_NET_F_MRG_RXBUF);
 137         /* Kernel can't actually handle UFO in software currently. */
 138     }
 139 #endif
 140
 141     return features;
 142 }
 143
 144 static uint32_t virtio_net_bad_features(VirtIODevice *vdev)
 145 {
 146     uint32_t features = 0;
 147
 148     /* Linux kernel 2.6.25.  It understood MAC (as everyone must),
 149      * but also these: */
 150     features |= (1 << VIRTIO_NET_F_MAC);
 151     features |= (1 << VIRTIO_NET_F_GUEST_CSUM);
 152     features |= (1 << VIRTIO_NET_F_GUEST_TSO4);
 153     features |= (1 << VIRTIO_NET_F_GUEST_TSO6);
 154     features |= (1 << VIRTIO_NET_F_GUEST_ECN);
 155
 156     return features & virtio_net_get_features(vdev);
 157 }
 158
 159 static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
 160 {
 161     VirtIONet *n = to_virtio_net(vdev);
 162 #ifdef TAP_VNET_HDR
 163     VLANClientState *host = n->vc->vlan->first_client;
 164 #endif
 165
 166     n->mergeable_rx_bufs = !!(features & (1 << VIRTIO_NET_F_MRG_RXBUF));
 167
 168 #ifdef TAP_VNET_HDR
 169     if (!tap_has_vnet_hdr(host) || !host->set_offload)
 170         return;
 171
 172     host->set_offload(host,
 173                       (features >> VIRTIO_NET_F_GUEST_CSUM) & 1,
 174                       (features >> VIRTIO_NET_F_GUEST_TSO4) & 1,
 175                       (features >> VIRTIO_NET_F_GUEST_TSO6) & 1,
 176                       (features >> VIRTIO_NET_F_GUEST_ECN)  & 1);
 177 #endif
 178 }
 179
 180 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
 181                                      VirtQueueElement *elem)
 182 {
 183     uint8_t on;
 184
 185     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(on)) {
 186         fprintf(stderr, "virtio-net ctrl invalid rx mode command\n");
 187         exit(1);
 188     }
 189
 190     on = ldub_p(elem->out_sg[1].iov_base);
 191
 192     if (cmd == VIRTIO_NET_CTRL_RX_MODE_PROMISC)
 193         n->promisc = on;
 194     else if (cmd == VIRTIO_NET_CTRL_RX_MODE_ALLMULTI)
 195         n->allmulti = on;
 196     else
 197         return VIRTIO_NET_ERR;
 198
 199     return VIRTIO_NET_OK;
 200 }
 201
 202 static int virtio_net_handle_mac(VirtIONet *n, uint8_t cmd,
 203                                  VirtQueueElement *elem)
 204 {
 205     struct virtio_net_ctrl_mac mac_data;
 206
 207     if (cmd != VIRTIO_NET_CTRL_MAC_TABLE_SET || elem->out_num != 3 ||
 208         elem->out_sg[1].iov_len < sizeof(mac_data) ||
 209         elem->out_sg[2].iov_len < sizeof(mac_data))
 210         return VIRTIO_NET_ERR;
 211
 212     n->mac_table.in_use = 0;
 213     memset(n->mac_table.macs, 0, MAC_TABLE_ENTRIES * ETH_ALEN);
 214
 215     mac_data.entries = ldl_le_p(elem->out_sg[1].iov_base);
 216
 217     if (sizeof(mac_data.entries) +
 218         (mac_data.entries * ETH_ALEN) > elem->out_sg[1].iov_len)
 219         return VIRTIO_NET_ERR;
 220
 221     if (mac_data.entries <= MAC_TABLE_ENTRIES) {
 222         memcpy(n->mac_table.macs, elem->out_sg[1].iov_base + sizeof(mac_data),
 223                mac_data.entries * ETH_ALEN);
 224         n->mac_table.in_use += mac_data.entries;
 225     } else {
 226         n->promisc = 1;
 227         return VIRTIO_NET_OK;
 228     }
 229
 230     mac_data.entries = ldl_le_p(elem->out_sg[2].iov_base);
 231
 232     if (sizeof(mac_data.entries) +
 233         (mac_data.entries * ETH_ALEN) > elem->out_sg[2].iov_len)
 234         return VIRTIO_NET_ERR;
 235
 236     if (mac_data.entries) {
 237         if (n->mac_table.in_use + mac_data.entries <= MAC_TABLE_ENTRIES) {
 238             memcpy(n->mac_table.macs + (n->mac_table.in_use * ETH_ALEN),
 239                    elem->out_sg[2].iov_base + sizeof(mac_data),
 240                    mac_data.entries * ETH_ALEN);
 241             n->mac_table.in_use += mac_data.entries;
 242         } else
 243             n->allmulti = 1;
 244     }
 245
 246     return VIRTIO_NET_OK;
 247 }
 248
 249 static int virtio_net_handle_vlan_table(VirtIONet *n, uint8_t cmd,
 250                                         VirtQueueElement *elem)
 251 {
 252     uint16_t vid;
 253
 254     if (elem->out_num != 2 || elem->out_sg[1].iov_len != sizeof(vid)) {
 255         fprintf(stderr, "virtio-net ctrl invalid vlan command\n");
 256         return VIRTIO_NET_ERR;
 257     }
 258
 259     vid = lduw_le_p(elem->out_sg[1].iov_base);
 260
 261     if (vid >= MAX_VLAN)
 262         return VIRTIO_NET_ERR;
 263
 264     if (cmd == VIRTIO_NET_CTRL_VLAN_ADD)
 265         n->vlans[vid >> 5] |= (1U << (vid & 0x1f));
 266     else if (cmd == VIRTIO_NET_CTRL_VLAN_DEL)
 267         n->vlans[vid >> 5] &= ~(1U << (vid & 0x1f));
 268     else
 269         return VIRTIO_NET_ERR;
 270
 271     return VIRTIO_NET_OK;
 272 }
 273
 274 static void virtio_net_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
 275 {
 276     VirtIONet *n = to_virtio_net(vdev);
 277     struct virtio_net_ctrl_hdr ctrl;
 278     virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
 279     VirtQueueElement elem;
 280
 281     while (virtqueue_pop(vq, &elem)) {
 282         if ((elem.in_num < 1) || (elem.out_num < 1)) {
 283             fprintf(stderr, "virtio-net ctrl missing headers\n");
 284             exit(1);
 285         }
 286
 287         if (elem.out_sg[0].iov_len < sizeof(ctrl) ||
 288             elem.in_sg[elem.in_num - 1].iov_len < sizeof(status)) {
 289             fprintf(stderr, "virtio-net ctrl header not in correct element\n");
 290             exit(1);
 291         }
 292
 293         ctrl.class = ldub_p(elem.out_sg[0].iov_base);
 294         ctrl.cmd = ldub_p(elem.out_sg[0].iov_base + sizeof(ctrl.class));
 295
 296         if (ctrl.class == VIRTIO_NET_CTRL_RX_MODE)
 297             status = virtio_net_handle_rx_mode(n, ctrl.cmd, &elem);
 298         else if (ctrl.class == VIRTIO_NET_CTRL_MAC)
 299             status = virtio_net_handle_mac(n, ctrl.cmd, &elem);
 300         else if (ctrl.class == VIRTIO_NET_CTRL_VLAN)
 301             status = virtio_net_handle_vlan_table(n, ctrl.cmd, &elem);
 302
 303         stb_p(elem.in_sg[elem.in_num - 1].iov_base, status);
 304
 305         virtqueue_push(vq, &elem, sizeof(status));
 306         virtio_notify(vdev, vq);
 307     }
 308 }
 309
 310 /* RX */
 311
 312 static void virtio_net_handle_rx(VirtIODevice *vdev, VirtQueue *vq)
 313 {
 314 #ifdef USE_KVM
 315     /* We now have RX buffers, signal to the IO thread to break out of the
 316        select to re-poll the tap file descriptor */
 317     if (kvm_enabled())
 318         qemu_kvm_notify_work();
 319 #endif
 320 }
 321
 322 static int do_virtio_net_can_receive(VirtIONet *n, int bufsize)
 323 {
 324     if (!virtio_queue_ready(n->rx_vq) ||
 325         !(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 326         return 0;
 327
 328     if (virtio_queue_empty(n->rx_vq) ||
 329         (n->mergeable_rx_bufs &&
 330          !virtqueue_avail_bytes(n->rx_vq, bufsize, 0))) {
 331         virtio_queue_set_notification(n->rx_vq, 1);
 332         return 0;
 333     }
 334
 335     virtio_queue_set_notification(n->rx_vq, 0);
 336     return 1;
 337 }
 338
 339 static int virtio_net_can_receive(void *opaque)
 340 {
 341     VirtIONet *n = opaque;
 342
 343     return do_virtio_net_can_receive(n, VIRTIO_NET_MAX_BUFSIZE);
 344 }
 345
 346 #ifdef TAP_VNET_HDR
 347 /* dhclient uses AF_PACKET but doesn't pass auxdata to the kernel so
 348  * it never finds out that the packets don't have valid checksums.  This
 349  * causes dhclient to get upset.  Fedora's carried a patch for ages to
 350  * fix this with Xen but it hasn't appeared in an upstream release of
 351  * dhclient yet.
 352  *
 353  * To avoid breaking existing guests, we catch udp packets and add
 354  * checksums.  This is terrible but it's better than hacking the guest
 355  * kernels.
 356  *
 357  * N.B. if we introduce a zero-copy API, this operation is no longer free so
 358  * we should provide a mechanism to disable it to avoid polluting the host
 359  * cache.
 360  */
 361 static void work_around_broken_dhclient(struct virtio_net_hdr *hdr,
 362                                         const uint8_t *buf, size_t size)
 363 {
 364     if ((hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && /* missing csum */
 365         (size > 27 && size < 1500) && /* normal sized MTU */
 366         (buf[12] == 0x08 && buf[13] == 0x00) && /* ethertype == IPv4 */
 367         (buf[23] == 17) && /* ip.protocol == UDP */
 368         (buf[34] == 0 && buf[35] == 67)) { /* udp.srcport == bootps */
 369         /* FIXME this cast is evil */
 370         net_checksum_calculate((uint8_t *)buf, size);
 371         hdr->flags &= ~VIRTIO_NET_HDR_F_NEEDS_CSUM;
 372     }
 373 }
 374 #endif
 375
 376 static int iov_fill(struct iovec *iov, int iovcnt, const void *buf, int count)
 377 {
 378     int offset, i;
 379
 380     offset = i = 0;
 381     while (offset < count && i < iovcnt) {
 382         int len = MIN(iov[i].iov_len, count - offset);
 383         memcpy(iov[i].iov_base, buf + offset, len);
 384         offset += len;
 385         i++;
 386     }
 387
 388     return offset;
 389 }
 390
 391 static int receive_header(VirtIONet *n, struct iovec *iov, int iovcnt,
 392                           const void *buf, size_t size, size_t hdr_len)
 393 {
 394     struct virtio_net_hdr *hdr = iov[0].iov_base;
 395     int offset = 0;
 396
 397     hdr->flags = 0;
 398     hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
 399
 400 #ifdef TAP_VNET_HDR
 401     if (tap_has_vnet_hdr(n->vc->vlan->first_client)) {
 402         memcpy(hdr, buf, sizeof(*hdr));
 403         offset = sizeof(*hdr);
 404         work_around_broken_dhclient(hdr, buf + offset, size - offset);
 405     }
 406 #endif
 407
 408     /* We only ever receive a struct virtio_net_hdr from the tapfd,
 409      * but we may be passing along a larger header to the guest.
 410      */
 411     iov[0].iov_base += hdr_len;
 412     iov[0].iov_len  -= hdr_len;
 413
 414     return offset;
 415 }
 416
 417 static int receive_filter(VirtIONet *n, const uint8_t *buf, int size)
 418 {
 419     static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 420     static const uint8_t vlan[] = {0x81, 0x00};
 421     uint8_t *ptr = (uint8_t *)buf;
 422     int i;
 423
 424     if (n->promisc)
 425         return 1;
 426
 427 #ifdef TAP_VNET_HDR
 428     if (tap_has_vnet_hdr(n->vc->vlan->first_client))
 429         ptr += sizeof(struct virtio_net_hdr);
 430 #endif
 431
 432     if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
 433         int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
 434         if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
 435             return 0;
 436     }
 437
 438     if ((ptr[0] & 1) && n->allmulti)
 439         return 1;
 440
 441     if (!memcmp(ptr, bcast, sizeof(bcast)))
 442         return 1;
 443
 444     if (!memcmp(ptr, n->mac, ETH_ALEN))
 445         return 1;
 446
 447     for (i = 0; i < n->mac_table.in_use; i++) {
 448         if (!memcmp(ptr, &n->mac_table.macs[i * ETH_ALEN], ETH_ALEN))
 449             return 1;
 450     }
 451
 452     return 0;
 453 }
 454
 455 static void virtio_net_receive(void *opaque, const uint8_t *buf, int size)
 456 {
 457     VirtIONet *n = opaque;
 458     struct virtio_net_hdr_mrg_rxbuf *mhdr = NULL;
 459     size_t hdr_len, offset, i;
 460
 461     if (!do_virtio_net_can_receive(n, size))
 462         return;
 463
 464     if (!receive_filter(n, buf, size))
 465         return;
 466
 467     /* hdr_len refers to the header we supply to the guest */
 468     hdr_len = n->mergeable_rx_bufs ?
 469         sizeof(struct virtio_net_hdr_mrg_rxbuf) : sizeof(struct virtio_net_hdr);
 470
 471     offset = i = 0;
 472
 473     while (offset < size) {
 474         VirtQueueElement elem;
 475         int len, total;
 476         struct iovec sg[VIRTQUEUE_MAX_SIZE];
 477
 478         len = total = 0;
 479
 480         if ((i != 0 && !n->mergeable_rx_bufs) ||
 481             virtqueue_pop(n->rx_vq, &elem) == 0) {
 482             if (i == 0)
 483                 return;
 484             fprintf(stderr, "virtio-net truncating packet\n");
 485             exit(1);
 486         }
 487
 488         if (elem.in_num < 1) {
 489             fprintf(stderr, "virtio-net receive queue contains no in buffers\n");
 490             exit(1);
 491         }
 492
 493         if (!n->mergeable_rx_bufs && elem.in_sg[0].iov_len != hdr_len) {
 494             fprintf(stderr, "virtio-net header not in first element\n");
 495             exit(1);
 496         }
 497
 498         memcpy(&sg, &elem.in_sg[0], sizeof(sg[0]) * elem.in_num);
 499
 500         if (i == 0) {
 501             if (n->mergeable_rx_bufs)
 502                 mhdr = (struct virtio_net_hdr_mrg_rxbuf *)sg[0].iov_base;
 503
 504             offset += receive_header(n, sg, elem.in_num,
 505                                      buf + offset, size - offset, hdr_len);
 506             total += hdr_len;
 507         }
 508
 509         /* copy in packet.  ugh */
 510         len = iov_fill(sg, elem.in_num,
 511                        buf + offset, size - offset);
 512         total += len;
 513
 514         /* signal other side */
 515         virtqueue_fill(n->rx_vq, &elem, total, i++);
 516
 517         offset += len;
 518     }
 519
 520     if (mhdr)
 521         mhdr->num_buffers = i;
 522
 523     virtqueue_flush(n->rx_vq, i);
 524     virtio_notify(&n->vdev, n->rx_vq);
 525 }
 526
 527 /* TX */
 528 static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
 529 {
 530     VirtQueueElement elem;
 531 #ifdef TAP_VNET_HDR
 532     int has_vnet_hdr = tap_has_vnet_hdr(n->vc->vlan->first_client);
 533 #else
 534     int has_vnet_hdr = 0;
 535 #endif
 536
 537     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 538         return;
 539
 540     while (virtqueue_pop(vq, &elem)) {
 541         ssize_t len = 0;
 542         unsigned int out_num = elem.out_num;
 543         struct iovec *out_sg = &elem.out_sg[0];
 544         unsigned hdr_len;
 545
 546         /* hdr_len refers to the header received from the guest */
 547         hdr_len = n->mergeable_rx_bufs ?
 548             sizeof(struct virtio_net_hdr_mrg_rxbuf) :
 549             sizeof(struct virtio_net_hdr);
 550
 551         if (out_num < 1 || out_sg->iov_len != hdr_len) {
 552             fprintf(stderr, "virtio-net header not in first element\n");
 553             exit(1);
 554         }
 555
 556         /* ignore the header if GSO is not supported */
 557         if (!has_vnet_hdr) {
 558             out_num--;
 559             out_sg++;
 560             len += hdr_len;
 561         } else if (n->mergeable_rx_bufs) {
 562             /* tapfd expects a struct virtio_net_hdr */
 563             hdr_len -= sizeof(struct virtio_net_hdr);
 564             out_sg->iov_len -= hdr_len;
 565             len += hdr_len;
 566         }
 567
 568         len += qemu_sendv_packet(n->vc, out_sg, out_num);
 569
 570         virtqueue_push(vq, &elem, len);
 571         virtio_notify(&n->vdev, vq);
 572     }
 573 }
 574
 575 static void virtio_net_handle_tx(VirtIODevice *vdev, VirtQueue *vq)
 576 {
 577     VirtIONet *n = to_virtio_net(vdev);
 578
 579     if (n->tx_timer_active) {
 580         virtio_queue_set_notification(vq, 1);
 581         qemu_del_timer(n->tx_timer);
 582         n->tx_timer_active = 0;
 583         virtio_net_flush_tx(n, vq);
 584     } else {
 585         qemu_mod_timer(n->tx_timer,
 586                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 587         n->tx_timer_active = 1;
 588         virtio_queue_set_notification(vq, 0);
 589     }
 590 }
 591
 592 static void virtio_net_tx_timer(void *opaque)
 593 {
 594     VirtIONet *n = opaque;
 595
 596     n->tx_timer_active = 0;
 597
 598     /* Just in case the driver is not ready on more */
 599     if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
 600         return;
 601
 602     virtio_queue_set_notification(n->tx_vq, 1);
 603     virtio_net_flush_tx(n, n->tx_vq);
 604 }
 605
 606 static void virtio_net_save(QEMUFile *f, void *opaque)
 607 {
 608     VirtIONet *n = opaque;
 609
 610     virtio_save(&n->vdev, f);
 611
 612     qemu_put_buffer(f, n->mac, ETH_ALEN);
 613     qemu_put_be32(f, n->tx_timer_active);
 614     qemu_put_be32(f, n->mergeable_rx_bufs);
 615     qemu_put_be16(f, n->status);
 616     qemu_put_be32(f, n->promisc);
 617     qemu_put_be32(f, n->allmulti);
 618     qemu_put_be32(f, n->mac_table.in_use);
 619     qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
 620     qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 621
 622 #ifdef TAP_VNET_HDR
 623     qemu_put_be32(f, tap_has_vnet_hdr(n->vc->vlan->first_client));
 624 #else
 625     qemu_put_be32(f, 0);
 626 #endif
 627 }
 628
 629 static int virtio_net_load(QEMUFile *f, void *opaque, int version_id)
 630 {
 631     VirtIONet *n = opaque;
 632
 633     if (version_id < 2 || version_id > VIRTIO_NET_VM_VERSION)
 634         return -EINVAL;
 635
 636     virtio_load(&n->vdev, f);
 637
 638     qemu_get_buffer(f, n->mac, ETH_ALEN);
 639     n->tx_timer_active = qemu_get_be32(f);
 640     n->mergeable_rx_bufs = qemu_get_be32(f);
 641
 642     if (version_id >= 3)
 643         n->status = qemu_get_be16(f);
 644
 645     if (version_id >= 4) {
 646         n->promisc = qemu_get_be32(f);
 647         n->allmulti = qemu_get_be32(f);
 648     }
 649
 650     if (version_id >= 5) {
 651         n->mac_table.in_use = qemu_get_be32(f);
 652         /* MAC_TABLE_ENTRIES may be different from the saved image */
 653         if (n->mac_table.in_use <= MAC_TABLE_ENTRIES) {
 654             qemu_get_buffer(f, n->mac_table.macs,
 655                             n->mac_table.in_use * ETH_ALEN);
 656         } else if (n->mac_table.in_use) {
 657             qemu_fseek(f, n->mac_table.in_use * ETH_ALEN, SEEK_CUR);
 658             n->promisc = 1;
 659             n->mac_table.in_use = 0;
 660         }
 661     }
 662
 663     if (version_id >= 6)
 664         qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
 665
 666     if (version_id == 7 && qemu_get_be32(f)) {
 667 #ifdef TAP_VNET_HDR
 668         tap_using_vnet_hdr(n->vc->vlan->first_client, 1);
 669 #else
 670         fprintf(stderr,
 671                 "virtio-net: saved image requires vnet header support\n");
 672         exit(1);
 673 #endif
 674     }
 675
 676     if (n->tx_timer_active) {
 677         qemu_mod_timer(n->tx_timer,
 678                        qemu_get_clock(vm_clock) + TX_TIMER_INTERVAL);
 679     }
 680
 681     return 0;
 682 }
 683
 684 static void virtio_net_cleanup(VLANClientState *vc)
 685 {
 686     VirtIONet *n = vc->opaque;
 687
 688     unregister_savevm("virtio-net", n);
 689
 690     qemu_free(n->mac_table.macs);
 691     qemu_free(n->vlans);
 692
 693     qemu_del_timer(n->tx_timer);
 694     qemu_free_timer(n->tx_timer);
 695
 696     virtio_cleanup(&n->vdev);
 697 }
 698
 699 PCIDevice *virtio_net_init(PCIBus *bus, NICInfo *nd, int devfn)
 700 {
 701     VirtIONet *n;
 702     static int virtio_net_id;
 703
 704     n = (VirtIONet *)virtio_init_pci(bus, "virtio-net",
 705                                      PCI_VENDOR_ID_REDHAT_QUMRANET,
 706                                      PCI_DEVICE_ID_VIRTIO_NET,
 707                                      PCI_VENDOR_ID_REDHAT_QUMRANET,
 708                                      VIRTIO_ID_NET,
 709                                      PCI_CLASS_NETWORK_ETHERNET, 0x00,
 710                                      sizeof(struct virtio_net_config),
 711                                      sizeof(VirtIONet));
 712     if (!n)
 713         return NULL;
 714
 715     n->vdev.get_config = virtio_net_get_config;
 716     n->vdev.set_config = virtio_net_set_config;
 717     n->vdev.get_features = virtio_net_get_features;
 718     n->vdev.set_features = virtio_net_set_features;
 719     n->vdev.bad_features = virtio_net_bad_features;
 720     n->vdev.reset = virtio_net_reset;
 721     n->rx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_rx);
 722     n->tx_vq = virtio_add_queue(&n->vdev, 256, virtio_net_handle_tx);
 723     n->ctrl_vq = virtio_add_queue(&n->vdev, 16, virtio_net_handle_ctrl);
 724     memcpy(n->mac, nd->macaddr, ETH_ALEN);
 725     n->status = VIRTIO_NET_S_LINK_UP;
 726     n->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
 727                                  virtio_net_receive,
 728                                  virtio_net_can_receive,
 729                                  virtio_net_cleanup, n);
 730     n->vc->link_status_changed = virtio_net_set_link_status;
 731
 732     qemu_format_nic_info_str(n->vc, n->mac);
 733
 734     n->tx_timer = qemu_new_timer(vm_clock, virtio_net_tx_timer, n);
 735     n->tx_timer_active = 0;
 736     n->mergeable_rx_bufs = 0;
 737     n->promisc = 1; /* for compatibility */
 738
 739     n->mac_table.macs = qemu_mallocz(MAC_TABLE_ENTRIES * ETH_ALEN);
 740
 741     n->vlans = qemu_mallocz(MAX_VLAN >> 3);
 742
 743     register_savevm("virtio-net", virtio_net_id++, VIRTIO_NET_VM_VERSION,
 744                     virtio_net_save, virtio_net_load, n);
 745     return (PCIDevice *)n;
 746 }