drivers/net/virtio_net.c

   1 /* A network driver using virtio.
   2  *
   3  * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 //#define DEBUG
  20 #include <linux/netdevice.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/ethtool.h>
  23 #include <linux/module.h>
  24 #include <linux/virtio.h>
  25 #include <linux/virtio_net.h>
  26 #include <linux/scatterlist.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/slab.h>
  29
  30 static int napi_weight = 128;
  31 module_param(napi_weight, int, 0444);
  32
  33 static bool csum = true, gso = true;
  34 module_param(csum, bool, 0444);
  35 module_param(gso, bool, 0444);
  36
  37 /* FIXME: MTU in config. */
  38 #define MAX_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN)
  39 #define GOOD_COPY_LEN   128
  40
  41 #define VIRTNET_SEND_COMMAND_SG_MAX    2
  42 #define VIRTNET_DRIVER_VERSION "1.0.0"
  43
  44 struct virtnet_stats {
  45         struct u64_stats_sync syncp;
  46         u64 tx_bytes;
  47         u64 tx_packets;
  48
  49         u64 rx_bytes;
  50         u64 rx_packets;
  51 };
  52
  53 struct virtnet_info {
  54         struct virtio_device *vdev;
  55         struct virtqueue *rvq, *svq, *cvq;
  56         struct net_device *dev;
  57         struct napi_struct napi;
  58         unsigned int status;
  59
  60         /* Number of input buffers, and max we've ever had. */
  61         unsigned int num, max;
  62
  63         /* I like... big packets and I cannot lie! */
  64         bool big_packets;
  65
  66         /* Host will merge rx buffers for big packets (shake it! shake it!) */
  67         bool mergeable_rx_bufs;
  68
  69         /* Active statistics */
  70         struct virtnet_stats __percpu *stats;
  71
  72         /* Work struct for refilling if we run low on memory. */
  73         struct delayed_work refill;
  74
  75         /* Chain pages by the private ptr. */
  76         struct page *pages;
  77
  78         /* fragments + linear part + virtio header */
  79         struct scatterlist rx_sg[MAX_SKB_FRAGS + 2];
  80         struct scatterlist tx_sg[MAX_SKB_FRAGS + 2];
  81 };
  82
  83 struct skb_vnet_hdr {
  84         union {
  85                 struct virtio_net_hdr hdr;
  86                 struct virtio_net_hdr_mrg_rxbuf mhdr;
  87         };
  88         unsigned int num_sg;
  89 };
  90
  91 struct padded_vnet_hdr {
  92         struct virtio_net_hdr hdr;
  93         /*
  94          * virtio_net_hdr should be in a separated sg buffer because of a
  95          * QEMU bug, and data sg buffer shares same page with this header sg.
  96          * This padding makes next sg 16 byte aligned after virtio_net_hdr.
  97          */
  98         char padding[6];
  99 };
 100
 101 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb)
 102 {
 103         return (struct skb_vnet_hdr *)skb->cb;
 104 }
 105
 106 /*
 107  * private is used to chain pages for big packets, put the whole
 108  * most recent used list in the beginning for reuse
 109  */
 110 static void give_pages(struct virtnet_info *vi, struct page *page)
 111 {
 112         struct page *end;
 113
 114         /* Find end of list, sew whole thing into vi->pages. */
 115         for (end = page; end->private; end = (struct page *)end->private);
 116         end->private = (unsigned long)vi->pages;
 117         vi->pages = page;
 118 }
 119
 120 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask)
 121 {
 122         struct page *p = vi->pages;
 123
 124         if (p) {
 125                 vi->pages = (struct page *)p->private;
 126                 /* clear private here, it is used to chain pages */
 127                 p->private = 0;
 128         } else
 129                 p = alloc_page(gfp_mask);
 130         return p;
 131 }
 132
 133 static void skb_xmit_done(struct virtqueue *svq)
 134 {
 135         struct virtnet_info *vi = svq->vdev->priv;
 136
 137         /* Suppress further interrupts. */
 138         virtqueue_disable_cb(svq);
 139
 140         /* We were probably waiting for more output buffers. */
 141         netif_wake_queue(vi->dev);
 142 }
 143
 144 static void set_skb_frag(struct sk_buff *skb, struct page *page,
 145                          unsigned int offset, unsigned int *len)
 146 {
 147         int size = min((unsigned)PAGE_SIZE - offset, *len);
 148         int i = skb_shinfo(skb)->nr_frags;
 149
 150         __skb_fill_page_desc(skb, i, page, offset, size);
 151
 152         skb->data_len += size;
 153         skb->len += size;
 154         skb->truesize += PAGE_SIZE;
 155         skb_shinfo(skb)->nr_frags++;
 156         *len -= size;
 157 }
 158
 159 /* Called from bottom half context */
 160 static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 161                                    struct page *page, unsigned int len)
 162 {
 163         struct sk_buff *skb;
 164         struct skb_vnet_hdr *hdr;
 165         unsigned int copy, hdr_len, offset;
 166         char *p;
 167
 168         p = page_address(page);
 169
 170         /* copy small packet so we can reuse these pages for small data */
 171         skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN);
 172         if (unlikely(!skb))
 173                 return NULL;
 174
 175         hdr = skb_vnet_hdr(skb);
 176
 177         if (vi->mergeable_rx_bufs) {
 178                 hdr_len = sizeof hdr->mhdr;
 179                 offset = hdr_len;
 180         } else {
 181                 hdr_len = sizeof hdr->hdr;
 182                 offset = sizeof(struct padded_vnet_hdr);
 183         }
 184
 185         memcpy(hdr, p, hdr_len);
 186
 187         len -= hdr_len;
 188         p += offset;
 189
 190         copy = len;
 191         if (copy > skb_tailroom(skb))
 192                 copy = skb_tailroom(skb);
 193         memcpy(skb_put(skb, copy), p, copy);
 194
 195         len -= copy;
 196         offset += copy;
 197
 198         /*
 199          * Verify that we can indeed put this data into a skb.
 200          * This is here to handle cases when the device erroneously
 201          * tries to receive more than is possible. This is usually
 202          * the case of a broken device.
 203          */
 204         if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
 205                 if (net_ratelimit())
 206                         pr_debug("%s: too much data\n", skb->dev->name);
 207                 dev_kfree_skb(skb);
 208                 return NULL;
 209         }
 210
 211         while (len) {
 212                 set_skb_frag(skb, page, offset, &len);
 213                 page = (struct page *)page->private;
 214                 offset = 0;
 215         }
 216
 217         if (page)
 218                 give_pages(vi, page);
 219
 220         return skb;
 221 }
 222
 223 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb)
 224 {
 225         struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
 226         struct page *page;
 227         int num_buf, i, len;
 228
 229         num_buf = hdr->mhdr.num_buffers;
 230         while (--num_buf) {
 231                 i = skb_shinfo(skb)->nr_frags;
 232                 if (i >= MAX_SKB_FRAGS) {
 233                         pr_debug("%s: packet too long\n", skb->dev->name);
 234                         skb->dev->stats.rx_length_errors++;
 235                         return -EINVAL;
 236                 }
 237                 page = virtqueue_get_buf(vi->rvq, &len);
 238                 if (!page) {
 239                         pr_debug("%s: rx error: %d buffers missing\n",
 240                                  skb->dev->name, hdr->mhdr.num_buffers);
 241                         skb->dev->stats.rx_length_errors++;
 242                         return -EINVAL;
 243                 }
 244
 245                 if (len > PAGE_SIZE)
 246                         len = PAGE_SIZE;
 247
 248                 set_skb_frag(skb, page, 0, &len);
 249
 250                 --vi->num;
 251         }
 252         return 0;
 253 }
 254
 255 static void receive_buf(struct net_device *dev, void *buf, unsigned int len)
 256 {
 257         struct virtnet_info *vi = netdev_priv(dev);
 258         struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
 259         struct sk_buff *skb;
 260         struct page *page;
 261         struct skb_vnet_hdr *hdr;
 262
 263         if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) {
 264                 pr_debug("%s: short packet %i\n", dev->name, len);
 265                 dev->stats.rx_length_errors++;
 266                 if (vi->mergeable_rx_bufs || vi->big_packets)
 267                         give_pages(vi, buf);
 268                 else
 269                         dev_kfree_skb(buf);
 270                 return;
 271         }
 272
 273         if (!vi->mergeable_rx_bufs && !vi->big_packets) {
 274                 skb = buf;
 275                 len -= sizeof(struct virtio_net_hdr);
 276                 skb_trim(skb, len);
 277         } else {
 278                 page = buf;
 279                 skb = page_to_skb(vi, page, len);
 280                 if (unlikely(!skb)) {
 281                         dev->stats.rx_dropped++;
 282                         give_pages(vi, page);
 283                         return;
 284                 }
 285                 if (vi->mergeable_rx_bufs)
 286                         if (receive_mergeable(vi, skb)) {
 287                                 dev_kfree_skb(skb);
 288                                 return;
 289                         }
 290         }
 291
 292         hdr = skb_vnet_hdr(skb);
 293
 294         u64_stats_update_begin(&stats->syncp);
 295         stats->rx_bytes += skb->len;
 296         stats->rx_packets++;
 297         u64_stats_update_end(&stats->syncp);
 298
 299         if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
 300                 pr_debug("Needs csum!\n");
 301                 if (!skb_partial_csum_set(skb,
 302                                           hdr->hdr.csum_start,
 303                                           hdr->hdr.csum_offset))
 304                         goto frame_err;
 305         } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) {
 306                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 307         }
 308
 309         skb->protocol = eth_type_trans(skb, dev);
 310         pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
 311                  ntohs(skb->protocol), skb->len, skb->pkt_type);
 312
 313         if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) {
 314                 pr_debug("GSO!\n");
 315                 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
 316                 case VIRTIO_NET_HDR_GSO_TCPV4:
 317                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
 318                         break;
 319                 case VIRTIO_NET_HDR_GSO_UDP:
 320                         skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
 321                         break;
 322                 case VIRTIO_NET_HDR_GSO_TCPV6:
 323                         skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
 324                         break;
 325                 default:
 326                         if (net_ratelimit())
 327                                 printk(KERN_WARNING "%s: bad gso type %u.\n",
 328                                        dev->name, hdr->hdr.gso_type);
 329                         goto frame_err;
 330                 }
 331
 332                 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN)
 333                         skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
 334
 335                 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size;
 336                 if (skb_shinfo(skb)->gso_size == 0) {
 337                         if (net_ratelimit())
 338                                 printk(KERN_WARNING "%s: zero gso size.\n",
 339                                        dev->name);
 340                         goto frame_err;
 341                 }
 342
 343                 /* Header must be checked, and gso_segs computed. */
 344                 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
 345                 skb_shinfo(skb)->gso_segs = 0;
 346         }
 347
 348         netif_receive_skb(skb);
 349         return;
 350
 351 frame_err:
 352         dev->stats.rx_frame_errors++;
 353         dev_kfree_skb(skb);
 354 }
 355
 356 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
 357 {
 358         struct sk_buff *skb;
 359         struct skb_vnet_hdr *hdr;
 360         int err;
 361
 362         skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp);
 363         if (unlikely(!skb))
 364                 return -ENOMEM;
 365
 366         skb_put(skb, MAX_PACKET_LEN);
 367
 368         hdr = skb_vnet_hdr(skb);
 369         sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr);
 370
 371         skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
 372
 373         err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
 374         if (err < 0)
 375                 dev_kfree_skb(skb);
 376
 377         return err;
 378 }
 379
 380 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
 381 {
 382         struct page *first, *list = NULL;
 383         char *p;
 384         int i, err, offset;
 385
 386         /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */
 387         for (i = MAX_SKB_FRAGS + 1; i > 1; --i) {
 388                 first = get_a_page(vi, gfp);
 389                 if (!first) {
 390                         if (list)
 391                                 give_pages(vi, list);
 392                         return -ENOMEM;
 393                 }
 394                 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE);
 395
 396                 /* chain new page in list head to match sg */
 397                 first->private = (unsigned long)list;
 398                 list = first;
 399         }
 400
 401         first = get_a_page(vi, gfp);
 402         if (!first) {
 403                 give_pages(vi, list);
 404                 return -ENOMEM;
 405         }
 406         p = page_address(first);
 407
 408         /* vi->rx_sg[0], vi->rx_sg[1] share the same page */
 409         /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */
 410         sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr));
 411
 412         /* vi->rx_sg[1] for data packet, from offset */
 413         offset = sizeof(struct padded_vnet_hdr);
 414         sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset);
 415
 416         /* chain first in list head */
 417         first->private = (unsigned long)list;
 418         err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
 419                                 first, gfp);
 420         if (err < 0)
 421                 give_pages(vi, first);
 422
 423         return err;
 424 }
 425
 426 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
 427 {
 428         struct page *page;
 429         int err;
 430
 431         page = get_a_page(vi, gfp);
 432         if (!page)
 433                 return -ENOMEM;
 434
 435         sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
 436
 437         err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
 438         if (err < 0)
 439                 give_pages(vi, page);
 440
 441         return err;
 442 }
 443
 444 /*
 445  * Returns false if we couldn't fill entirely (OOM).
 446  *
 447  * Normally run in the receive path, but can also be run from ndo_open
 448  * before we're receiving packets, or from refill_work which is
 449  * careful to disable receiving (using napi_disable).
 450  */
 451 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
 452 {
 453         int err;
 454         bool oom;
 455
 456         do {
 457                 if (vi->mergeable_rx_bufs)
 458                         err = add_recvbuf_mergeable(vi, gfp);
 459                 else if (vi->big_packets)
 460                         err = add_recvbuf_big(vi, gfp);
 461                 else
 462                         err = add_recvbuf_small(vi, gfp);
 463
 464                 oom = err == -ENOMEM;
 465                 if (err < 0)
 466                         break;
 467                 ++vi->num;
 468         } while (err > 0);
 469         if (unlikely(vi->num > vi->max))
 470                 vi->max = vi->num;
 471         virtqueue_kick(vi->rvq);
 472         return !oom;
 473 }
 474
 475 static void skb_recv_done(struct virtqueue *rvq)
 476 {
 477         struct virtnet_info *vi = rvq->vdev->priv;
 478         /* Schedule NAPI, Suppress further interrupts if successful. */
 479         if (napi_schedule_prep(&vi->napi)) {
 480                 virtqueue_disable_cb(rvq);
 481                 __napi_schedule(&vi->napi);
 482         }
 483 }
 484
 485 static void virtnet_napi_enable(struct virtnet_info *vi)
 486 {
 487         napi_enable(&vi->napi);
 488
 489         /* If all buffers were filled by other side before we napi_enabled, we
 490          * won't get another interrupt, so process any outstanding packets
 491          * now.  virtnet_poll wants re-enable the queue, so we disable here.
 492          * We synchronize against interrupts via NAPI_STATE_SCHED */
 493         if (napi_schedule_prep(&vi->napi)) {
 494                 virtqueue_disable_cb(vi->rvq);
 495                 __napi_schedule(&vi->napi);
 496         }
 497 }
 498
 499 static void refill_work(struct work_struct *work)
 500 {
 501         struct virtnet_info *vi;
 502         bool still_empty;
 503
 504         vi = container_of(work, struct virtnet_info, refill.work);
 505         napi_disable(&vi->napi);
 506         still_empty = !try_fill_recv(vi, GFP_KERNEL);
 507         virtnet_napi_enable(vi);
 508
 509         /* In theory, this can happen: if we don't get any buffers in
 510          * we will *never* try to fill again. */
 511         if (still_empty)
 512                 queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2);
 513 }
 514
 515 static int virtnet_poll(struct napi_struct *napi, int budget)
 516 {
 517         struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi);
 518         void *buf;
 519         unsigned int len, received = 0;
 520
 521 again:
 522         while (received < budget &&
 523                (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) {
 524                 receive_buf(vi->dev, buf, len);
 525                 --vi->num;
 526                 received++;
 527         }
 528
 529         if (vi->num < vi->max / 2) {
 530                 if (!try_fill_recv(vi, GFP_ATOMIC))
 531                         queue_delayed_work(system_nrt_wq, &vi->refill, 0);
 532         }
 533
 534         /* Out of packets? */
 535         if (received < budget) {
 536                 napi_complete(napi);
 537                 if (unlikely(!virtqueue_enable_cb(vi->rvq)) &&
 538                     napi_schedule_prep(napi)) {
 539                         virtqueue_disable_cb(vi->rvq);
 540                         __napi_schedule(napi);
 541                         goto again;
 542                 }
 543         }
 544
 545         return received;
 546 }
 547
 548 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi)
 549 {
 550         struct sk_buff *skb;
 551         unsigned int len, tot_sgs = 0;
 552         struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
 553
 554         while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) {
 555                 pr_debug("Sent skb %p\n", skb);
 556
 557                 u64_stats_update_begin(&stats->syncp);
 558                 stats->tx_bytes += skb->len;
 559                 stats->tx_packets++;
 560                 u64_stats_update_end(&stats->syncp);
 561
 562                 tot_sgs += skb_vnet_hdr(skb)->num_sg;
 563                 dev_kfree_skb_any(skb);
 564         }
 565         return tot_sgs;
 566 }
 567
 568 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
 569 {
 570         struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
 571         const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
 572
 573         pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
 574
 575         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 576                 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
 577                 hdr->hdr.csum_start = skb_checksum_start_offset(skb);
 578                 hdr->hdr.csum_offset = skb->csum_offset;
 579         } else {
 580                 hdr->hdr.flags = 0;
 581                 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0;
 582         }
 583
 584         if (skb_is_gso(skb)) {
 585                 hdr->hdr.hdr_len = skb_headlen(skb);
 586                 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size;
 587                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4)
 588                         hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
 589                 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6)
 590                         hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
 591                 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
 592                         hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP;
 593                 else
 594                         BUG();
 595                 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN)
 596                         hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN;
 597         } else {
 598                 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
 599                 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0;
 600         }
 601
 602         hdr->mhdr.num_buffers = 0;
 603
 604         /* Encode metadata header at front. */
 605         if (vi->mergeable_rx_bufs)
 606                 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr);
 607         else
 608                 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr);
 609
 610         hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
 611         return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
 612                                  0, skb, GFP_ATOMIC);
 613 }
 614
 615 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 616 {
 617         struct virtnet_info *vi = netdev_priv(dev);
 618         int capacity;
 619
 620         /* Free up any pending old buffers before queueing new ones. */
 621         free_old_xmit_skbs(vi);
 622
 623         /* Try to transmit */
 624         capacity = xmit_skb(vi, skb);
 625
 626         /* This can happen with OOM and indirect buffers. */
 627         if (unlikely(capacity < 0)) {
 628                 if (likely(capacity == -ENOMEM)) {
 629                         if (net_ratelimit())
 630                                 dev_warn(&dev->dev,
 631                                          "TX queue failure: out of memory\n");
 632                 } else {
 633                         dev->stats.tx_fifo_errors++;
 634                         if (net_ratelimit())
 635                                 dev_warn(&dev->dev,
 636                                          "Unexpected TX queue failure: %d\n",
 637                                          capacity);
 638                 }
 639                 dev->stats.tx_dropped++;
 640                 kfree_skb(skb);
 641                 return NETDEV_TX_OK;
 642         }
 643         virtqueue_kick(vi->svq);
 644
 645         /* Don't wait up for transmitted skbs to be freed. */
 646         skb_orphan(skb);
 647         nf_reset(skb);
 648
 649         /* Apparently nice girls don't return TX_BUSY; stop the queue
 650          * before it gets out of hand.  Naturally, this wastes entries. */
 651         if (capacity < 2+MAX_SKB_FRAGS) {
 652                 netif_stop_queue(dev);
 653                 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) {
 654                         /* More just got used, free them then recheck. */
 655                         capacity += free_old_xmit_skbs(vi);
 656                         if (capacity >= 2+MAX_SKB_FRAGS) {
 657                                 netif_start_queue(dev);
 658                                 virtqueue_disable_cb(vi->svq);
 659                         }
 660                 }
 661         }
 662
 663         return NETDEV_TX_OK;
 664 }
 665
 666 static int virtnet_set_mac_address(struct net_device *dev, void *p)
 667 {
 668         struct virtnet_info *vi = netdev_priv(dev);
 669         struct virtio_device *vdev = vi->vdev;
 670         int ret;
 671
 672         ret = eth_mac_addr(dev, p);
 673         if (ret)
 674                 return ret;
 675
 676         if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
 677                 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac),
 678                                   dev->dev_addr, dev->addr_len);
 679
 680         return 0;
 681 }
 682
 683 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev,
 684                                                struct rtnl_link_stats64 *tot)
 685 {
 686         struct virtnet_info *vi = netdev_priv(dev);
 687         int cpu;
 688         unsigned int start;
 689
 690         for_each_possible_cpu(cpu) {
 691                 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu);
 692                 u64 tpackets, tbytes, rpackets, rbytes;
 693
 694                 do {
 695                         start = u64_stats_fetch_begin(&stats->syncp);
 696                         tpackets = stats->tx_packets;
 697                         tbytes   = stats->tx_bytes;
 698                         rpackets = stats->rx_packets;
 699                         rbytes   = stats->rx_bytes;
 700                 } while (u64_stats_fetch_retry(&stats->syncp, start));
 701
 702                 tot->rx_packets += rpackets;
 703                 tot->tx_packets += tpackets;
 704                 tot->rx_bytes   += rbytes;
 705                 tot->tx_bytes   += tbytes;
 706         }
 707
 708         tot->tx_dropped = dev->stats.tx_dropped;
 709         tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
 710         tot->rx_dropped = dev->stats.rx_dropped;
 711         tot->rx_length_errors = dev->stats.rx_length_errors;
 712         tot->rx_frame_errors = dev->stats.rx_frame_errors;
 713
 714         return tot;
 715 }
 716
 717 #ifdef CONFIG_NET_POLL_CONTROLLER
 718 static void virtnet_netpoll(struct net_device *dev)
 719 {
 720         struct virtnet_info *vi = netdev_priv(dev);
 721
 722         napi_schedule(&vi->napi);
 723 }
 724 #endif
 725
 726 static int virtnet_open(struct net_device *dev)
 727 {
 728         struct virtnet_info *vi = netdev_priv(dev);
 729
 730         /* Make sure we have some buffers: if oom use wq. */
 731         if (!try_fill_recv(vi, GFP_KERNEL))
 732                 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
 733
 734         virtnet_napi_enable(vi);
 735         return 0;
 736 }
 737
 738 /*
 739  * Send command via the control virtqueue and check status.  Commands
 740  * supported by the hypervisor, as indicated by feature bits, should
 741  * never fail unless improperly formated.
 742  */
 743 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
 744                                  struct scatterlist *data, int out, int in)
 745 {
 746         struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2];
 747         struct virtio_net_ctrl_hdr ctrl;
 748         virtio_net_ctrl_ack status = ~0;
 749         unsigned int tmp;
 750         int i;
 751
 752         /* Caller should know better */
 753         BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ||
 754                 (out + in > VIRTNET_SEND_COMMAND_SG_MAX));
 755
 756         out++; /* Add header */
 757         in++; /* Add return status */
 758
 759         ctrl.class = class;
 760         ctrl.cmd = cmd;
 761
 762         sg_init_table(sg, out + in);
 763
 764         sg_set_buf(&sg[0], &ctrl, sizeof(ctrl));
 765         for_each_sg(data, s, out + in - 2, i)
 766                 sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
 767         sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
 768
 769         BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
 770
 771         virtqueue_kick(vi->cvq);
 772
 773         /*
 774          * Spin for a response, the kick causes an ioport write, trapping
 775          * into the hypervisor, so the request should be handled immediately.
 776          */
 777         while (!virtqueue_get_buf(vi->cvq, &tmp))
 778                 cpu_relax();
 779
 780         return status == VIRTIO_NET_OK;
 781 }
 782
 783 static int virtnet_close(struct net_device *dev)
 784 {
 785         struct virtnet_info *vi = netdev_priv(dev);
 786
 787         /* Make sure refill_work doesn't re-enable napi! */
 788         cancel_delayed_work_sync(&vi->refill);
 789         napi_disable(&vi->napi);
 790
 791         return 0;
 792 }
 793
 794 static void virtnet_set_rx_mode(struct net_device *dev)
 795 {
 796         struct virtnet_info *vi = netdev_priv(dev);
 797         struct scatterlist sg[2];
 798         u8 promisc, allmulti;
 799         struct virtio_net_ctrl_mac *mac_data;
 800         struct netdev_hw_addr *ha;
 801         int uc_count;
 802         int mc_count;
 803         void *buf;
 804         int i;
 805
 806         /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */
 807         if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
 808                 return;
 809
 810         promisc = ((dev->flags & IFF_PROMISC) != 0);
 811         allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
 812
 813         sg_init_one(sg, &promisc, sizeof(promisc));
 814
 815         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
 816                                   VIRTIO_NET_CTRL_RX_PROMISC,
 817                                   sg, 1, 0))
 818                 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
 819                          promisc ? "en" : "dis");
 820
 821         sg_init_one(sg, &allmulti, sizeof(allmulti));
 822
 823         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
 824                                   VIRTIO_NET_CTRL_RX_ALLMULTI,
 825                                   sg, 1, 0))
 826                 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
 827                          allmulti ? "en" : "dis");
 828
 829         uc_count = netdev_uc_count(dev);
 830         mc_count = netdev_mc_count(dev);
 831         /* MAC filter - use one buffer for both lists */
 832         buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) +
 833                       (2 * sizeof(mac_data->entries)), GFP_ATOMIC);
 834         mac_data = buf;
 835         if (!buf) {
 836                 dev_warn(&dev->dev, "No memory for MAC address buffer\n");
 837                 return;
 838         }
 839
 840         sg_init_table(sg, 2);
 841
 842         /* Store the unicast list and count in the front of the buffer */
 843         mac_data->entries = uc_count;
 844         i = 0;
 845         netdev_for_each_uc_addr(ha, dev)
 846                 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
 847
 848         sg_set_buf(&sg[0], mac_data,
 849                    sizeof(mac_data->entries) + (uc_count * ETH_ALEN));
 850
 851         /* multicast list and count fill the end */
 852         mac_data = (void *)&mac_data->macs[uc_count][0];
 853
 854         mac_data->entries = mc_count;
 855         i = 0;
 856         netdev_for_each_mc_addr(ha, dev)
 857                 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN);
 858
 859         sg_set_buf(&sg[1], mac_data,
 860                    sizeof(mac_data->entries) + (mc_count * ETH_ALEN));
 861
 862         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC,
 863                                   VIRTIO_NET_CTRL_MAC_TABLE_SET,
 864                                   sg, 2, 0))
 865                 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n");
 866
 867         kfree(buf);
 868 }
 869
 870 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid)
 871 {
 872         struct virtnet_info *vi = netdev_priv(dev);
 873         struct scatterlist sg;
 874
 875         sg_init_one(&sg, &vid, sizeof(vid));
 876
 877         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
 878                                   VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0))
 879                 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid);
 880         return 0;
 881 }
 882
 883 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid)
 884 {
 885         struct virtnet_info *vi = netdev_priv(dev);
 886         struct scatterlist sg;
 887
 888         sg_init_one(&sg, &vid, sizeof(vid));
 889
 890         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
 891                                   VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))
 892                 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid);
 893         return 0;
 894 }
 895
 896 static void virtnet_get_ringparam(struct net_device *dev,
 897                                 struct ethtool_ringparam *ring)
 898 {
 899         struct virtnet_info *vi = netdev_priv(dev);
 900
 901         ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq);
 902         ring->tx_max_pending = virtqueue_get_vring_size(vi->svq);
 903         ring->rx_pending = ring->rx_max_pending;
 904         ring->tx_pending = ring->tx_max_pending;
 905
 906 }
 907
 908
 909 static void virtnet_get_drvinfo(struct net_device *dev,
 910                                 struct ethtool_drvinfo *info)
 911 {
 912         struct virtnet_info *vi = netdev_priv(dev);
 913         struct virtio_device *vdev = vi->vdev;
 914
 915         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 916         strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version));
 917         strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info));
 918
 919 }
 920
 921 static const struct ethtool_ops virtnet_ethtool_ops = {
 922         .get_drvinfo = virtnet_get_drvinfo,
 923         .get_link = ethtool_op_get_link,
 924         .get_ringparam = virtnet_get_ringparam,
 925 };
 926
 927 #define MIN_MTU 68
 928 #define MAX_MTU 65535
 929
 930 static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
 931 {
 932         if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
 933                 return -EINVAL;
 934         dev->mtu = new_mtu;
 935         return 0;
 936 }
 937
 938 static const struct net_device_ops virtnet_netdev = {
 939         .ndo_open            = virtnet_open,
 940         .ndo_stop            = virtnet_close,
 941         .ndo_start_xmit      = start_xmit,
 942         .ndo_validate_addr   = eth_validate_addr,
 943         .ndo_set_mac_address = virtnet_set_mac_address,
 944         .ndo_set_rx_mode     = virtnet_set_rx_mode,
 945         .ndo_change_mtu      = virtnet_change_mtu,
 946         .ndo_get_stats64     = virtnet_stats,
 947         .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid,
 948         .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid,
 949 #ifdef CONFIG_NET_POLL_CONTROLLER
 950         .ndo_poll_controller = virtnet_netpoll,
 951 #endif
 952 };
 953
 954 static void virtnet_update_status(struct virtnet_info *vi)
 955 {
 956         u16 v;
 957
 958         if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS,
 959                               offsetof(struct virtio_net_config, status),
 960                               &v) < 0)
 961                 return;
 962
 963         /* Ignore unknown (future) status bits */
 964         v &= VIRTIO_NET_S_LINK_UP;
 965
 966         if (vi->status == v)
 967                 return;
 968
 969         vi->status = v;
 970
 971         if (vi->status & VIRTIO_NET_S_LINK_UP) {
 972                 netif_carrier_on(vi->dev);
 973                 netif_wake_queue(vi->dev);
 974         } else {
 975                 netif_carrier_off(vi->dev);
 976                 netif_stop_queue(vi->dev);
 977         }
 978 }
 979
 980 static void virtnet_config_changed(struct virtio_device *vdev)
 981 {
 982         struct virtnet_info *vi = vdev->priv;
 983
 984         virtnet_update_status(vi);
 985 }
 986
 987 static int init_vqs(struct virtnet_info *vi)
 988 {
 989         struct virtqueue *vqs[3];
 990         vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
 991         const char *names[] = { "input", "output", "control" };
 992         int nvqs, err;
 993
 994         /* We expect two virtqueues, receive then send,
 995          * and optionally control. */
 996         nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
 997
 998         err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
 999         if (err)
1000                 return err;
1001
1002         vi->rvq = vqs[0];
1003         vi->svq = vqs[1];
1004
1005         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
1006                 vi->cvq = vqs[2];
1007
1008                 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
1009                         vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
1010         }
1011         return 0;
1012 }
1013
1014 static int virtnet_probe(struct virtio_device *vdev)
1015 {
1016         int err;
1017         struct net_device *dev;
1018         struct virtnet_info *vi;
1019
1020         /* Allocate ourselves a network device with room for our info */
1021         dev = alloc_etherdev(sizeof(struct virtnet_info));
1022         if (!dev)
1023                 return -ENOMEM;
1024
1025         /* Set up network device as normal. */
1026         dev->priv_flags |= IFF_UNICAST_FLT;
1027         dev->netdev_ops = &virtnet_netdev;
1028         dev->features = NETIF_F_HIGHDMA;
1029
1030         SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops);
1031         SET_NETDEV_DEV(dev, &vdev->dev);
1032
1033         /* Do we support "hardware" checksums? */
1034         if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) {
1035                 /* This opens up the world of extra features. */
1036                 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1037                 if (csum)
1038                         dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST;
1039
1040                 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) {
1041                         dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO
1042                                 | NETIF_F_TSO_ECN | NETIF_F_TSO6;
1043                 }
1044                 /* Individual feature bits: what can host handle? */
1045                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4))
1046                         dev->hw_features |= NETIF_F_TSO;
1047                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6))
1048                         dev->hw_features |= NETIF_F_TSO6;
1049                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN))
1050                         dev->hw_features |= NETIF_F_TSO_ECN;
1051                 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO))
1052                         dev->hw_features |= NETIF_F_UFO;
1053
1054                 if (gso)
1055                         dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO);
1056                 /* (!csum && gso) case will be fixed by register_netdev() */
1057         }
1058
1059         /* Configuration may specify what MAC to use.  Otherwise random. */
1060         if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC,
1061                                   offsetof(struct virtio_net_config, mac),
1062                                   dev->dev_addr, dev->addr_len) < 0)
1063                 eth_hw_addr_random(dev);
1064
1065         /* Set up our device-specific information */
1066         vi = netdev_priv(dev);
1067         netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight);
1068         vi->dev = dev;
1069         vi->vdev = vdev;
1070         vdev->priv = vi;
1071         vi->pages = NULL;
1072         vi->stats = alloc_percpu(struct virtnet_stats);
1073         err = -ENOMEM;
1074         if (vi->stats == NULL)
1075                 goto free;
1076
1077         INIT_DELAYED_WORK(&vi->refill, refill_work);
1078         sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg));
1079         sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg));
1080
1081         /* If we can receive ANY GSO packets, we must allocate large ones. */
1082         if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
1083             virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
1084             virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN))
1085                 vi->big_packets = true;
1086
1087         if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
1088                 vi->mergeable_rx_bufs = true;
1089
1090         err = init_vqs(vi);
1091         if (err)
1092                 goto free_stats;
1093
1094         err = register_netdev(dev);
1095         if (err) {
1096                 pr_debug("virtio_net: registering device failed\n");
1097                 goto free_vqs;
1098         }
1099
1100         /* Last of all, set up some receive buffers. */
1101         try_fill_recv(vi, GFP_KERNEL);
1102
1103         /* If we didn't even get one input buffer, we're useless. */
1104         if (vi->num == 0) {
1105                 err = -ENOMEM;
1106                 goto unregister;
1107         }
1108
1109         /* Assume link up if device can't report link status,
1110            otherwise get link status from config. */
1111         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) {
1112                 netif_carrier_off(dev);
1113                 virtnet_update_status(vi);
1114         } else {
1115                 vi->status = VIRTIO_NET_S_LINK_UP;
1116                 netif_carrier_on(dev);
1117         }
1118
1119         pr_debug("virtnet: registered device %s\n", dev->name);
1120         return 0;
1121
1122 unregister:
1123         unregister_netdev(dev);
1124 free_vqs:
1125         vdev->config->del_vqs(vdev);
1126 free_stats:
1127         free_percpu(vi->stats);
1128 free:
1129         free_netdev(dev);
1130         return err;
1131 }
1132
1133 static void free_unused_bufs(struct virtnet_info *vi)
1134 {
1135         void *buf;
1136         while (1) {
1137                 buf = virtqueue_detach_unused_buf(vi->svq);
1138                 if (!buf)
1139                         break;
1140                 dev_kfree_skb(buf);
1141         }
1142         while (1) {
1143                 buf = virtqueue_detach_unused_buf(vi->rvq);
1144                 if (!buf)
1145                         break;
1146                 if (vi->mergeable_rx_bufs || vi->big_packets)
1147                         give_pages(vi, buf);
1148                 else
1149                         dev_kfree_skb(buf);
1150                 --vi->num;
1151         }
1152         BUG_ON(vi->num != 0);
1153 }
1154
1155 static void remove_vq_common(struct virtnet_info *vi)
1156 {
1157         vi->vdev->config->reset(vi->vdev);
1158
1159         /* Free unused buffers in both send and recv, if any. */
1160         free_unused_bufs(vi);
1161
1162         vi->vdev->config->del_vqs(vi->vdev);
1163
1164         while (vi->pages)
1165                 __free_pages(get_a_page(vi, GFP_KERNEL), 0);
1166 }
1167
1168 static void __devexit virtnet_remove(struct virtio_device *vdev)
1169 {
1170         struct virtnet_info *vi = vdev->priv;
1171
1172         unregister_netdev(vi->dev);
1173
1174         remove_vq_common(vi);
1175
1176         free_percpu(vi->stats);
1177         free_netdev(vi->dev);
1178 }
1179
1180 #ifdef CONFIG_PM
1181 static int virtnet_freeze(struct virtio_device *vdev)
1182 {
1183         struct virtnet_info *vi = vdev->priv;
1184
1185         virtqueue_disable_cb(vi->rvq);
1186         virtqueue_disable_cb(vi->svq);
1187         if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
1188                 virtqueue_disable_cb(vi->cvq);
1189
1190         netif_device_detach(vi->dev);
1191         cancel_delayed_work_sync(&vi->refill);
1192
1193         if (netif_running(vi->dev))
1194                 napi_disable(&vi->napi);
1195
1196         remove_vq_common(vi);
1197
1198         return 0;
1199 }
1200
1201 static int virtnet_restore(struct virtio_device *vdev)
1202 {
1203         struct virtnet_info *vi = vdev->priv;
1204         int err;
1205
1206         err = init_vqs(vi);
1207         if (err)
1208                 return err;
1209
1210         if (netif_running(vi->dev))
1211                 virtnet_napi_enable(vi);
1212
1213         netif_device_attach(vi->dev);
1214
1215         if (!try_fill_recv(vi, GFP_KERNEL))
1216                 queue_delayed_work(system_nrt_wq, &vi->refill, 0);
1217
1218         return 0;
1219 }
1220 #endif
1221
1222 static struct virtio_device_id id_table[] = {
1223         { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
1224         { 0 },
1225 };
1226
1227 static unsigned int features[] = {
1228         VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM,
1229         VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC,
1230         VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6,
1231         VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6,
1232         VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO,
1233         VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ,
1234         VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN,
1235 };
1236
1237 static struct virtio_driver virtio_net_driver = {
1238         .feature_table = features,
1239         .feature_table_size = ARRAY_SIZE(features),
1240         .driver.name =  KBUILD_MODNAME,
1241         .driver.owner = THIS_MODULE,
1242         .id_table =     id_table,
1243         .probe =        virtnet_probe,
1244         .remove =       __devexit_p(virtnet_remove),
1245         .config_changed = virtnet_config_changed,
1246 #ifdef CONFIG_PM
1247         .freeze =       virtnet_freeze,
1248         .restore =      virtnet_restore,
1249 #endif
1250 };
1251
1252 static int __init init(void)
1253 {
1254         return register_virtio_driver(&virtio_net_driver);
1255 }
1256
1257 static void __exit fini(void)
1258 {
1259         unregister_virtio_driver(&virtio_net_driver);
1260 }
1261 module_init(init);
1262 module_exit(fini);
1263
1264 MODULE_DEVICE_TABLE(virtio, id_table);
1265 MODULE_DESCRIPTION("Virtio network driver");
1266 MODULE_LICENSE("GPL");