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 /* enable config space updates */ 70 bool config_enable; 71 72 /* Active statistics */ 73 struct virtnet_stats __percpu *stats; 74 75 /* Work struct for refilling if we run low on memory. */ 76 struct delayed_work refill; 77 78 /* Work struct for config space updates */ 79 struct work_struct config_work; 80 81 /* Lock for config space updates */ 82 struct mutex config_lock; 83 84 /* Chain pages by the private ptr. */ 85 struct page *pages; 86 87 /* fragments + linear part + virtio header */ 88 struct scatterlist rx_sg[MAX_SKB_FRAGS + 2]; 89 struct scatterlist tx_sg[MAX_SKB_FRAGS + 2]; 90 }; 91 92 struct skb_vnet_hdr { 93 union { 94 struct virtio_net_hdr hdr; 95 struct virtio_net_hdr_mrg_rxbuf mhdr; 96 }; 97 unsigned int num_sg; 98 }; 99 100 struct padded_vnet_hdr { 101 struct virtio_net_hdr hdr; 102 /* 103 * virtio_net_hdr should be in a separated sg buffer because of a 104 * QEMU bug, and data sg buffer shares same page with this header sg. 105 * This padding makes next sg 16 byte aligned after virtio_net_hdr. 106 */ 107 char padding[6]; 108 }; 109 110 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) 111 { 112 return (struct skb_vnet_hdr *)skb->cb; 113 } 114 115 /* 116 * private is used to chain pages for big packets, put the whole 117 * most recent used list in the beginning for reuse 118 */ 119 static void give_pages(struct virtnet_info *vi, struct page *page) 120 { 121 struct page *end; 122 123 /* Find end of list, sew whole thing into vi->pages. */ 124 for (end = page; end->private; end = (struct page *)end->private); 125 end->private = (unsigned long)vi->pages; 126 vi->pages = page; 127 } 128 129 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) 130 { 131 struct page *p = vi->pages; 132 133 if (p) { 134 vi->pages = (struct page *)p->private; 135 /* clear private here, it is used to chain pages */ 136 p->private = 0; 137 } else 138 p = alloc_page(gfp_mask); 139 return p; 140 } 141 142 static void skb_xmit_done(struct virtqueue *svq) 143 { 144 struct virtnet_info *vi = svq->vdev->priv; 145 146 /* Suppress further interrupts. */ 147 virtqueue_disable_cb(svq); 148 149 /* We were probably waiting for more output buffers. */ 150 netif_wake_queue(vi->dev); 151 } 152 153 static void set_skb_frag(struct sk_buff *skb, struct page *page, 154 unsigned int offset, unsigned int *len) 155 { 156 int size = min((unsigned)PAGE_SIZE - offset, *len); 157 int i = skb_shinfo(skb)->nr_frags; 158 159 __skb_fill_page_desc(skb, i, page, offset, size); 160 161 skb->data_len += size; 162 skb->len += size; 163 skb->truesize += PAGE_SIZE; 164 skb_shinfo(skb)->nr_frags++; 165 *len -= size; 166 } 167 168 /* Called from bottom half context */ 169 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 170 struct page *page, unsigned int len) 171 { 172 struct sk_buff *skb; 173 struct skb_vnet_hdr *hdr; 174 unsigned int copy, hdr_len, offset; 175 char *p; 176 177 p = page_address(page); 178 179 /* copy small packet so we can reuse these pages for small data */ 180 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); 181 if (unlikely(!skb)) 182 return NULL; 183 184 hdr = skb_vnet_hdr(skb); 185 186 if (vi->mergeable_rx_bufs) { 187 hdr_len = sizeof hdr->mhdr; 188 offset = hdr_len; 189 } else { 190 hdr_len = sizeof hdr->hdr; 191 offset = sizeof(struct padded_vnet_hdr); 192 } 193 194 memcpy(hdr, p, hdr_len); 195 196 len -= hdr_len; 197 p += offset; 198 199 copy = len; 200 if (copy > skb_tailroom(skb)) 201 copy = skb_tailroom(skb); 202 memcpy(skb_put(skb, copy), p, copy); 203 204 len -= copy; 205 offset += copy; 206 207 /* 208 * Verify that we can indeed put this data into a skb. 209 * This is here to handle cases when the device erroneously 210 * tries to receive more than is possible. This is usually 211 * the case of a broken device. 212 */ 213 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 214 if (net_ratelimit()) 215 pr_debug("%s: too much data\n", skb->dev->name); 216 dev_kfree_skb(skb); 217 return NULL; 218 } 219 220 while (len) { 221 set_skb_frag(skb, page, offset, &len); 222 page = (struct page *)page->private; 223 offset = 0; 224 } 225 226 if (page) 227 give_pages(vi, page); 228 229 return skb; 230 } 231 232 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) 233 { 234 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); 235 struct page *page; 236 int num_buf, i, len; 237 238 num_buf = hdr->mhdr.num_buffers; 239 while (--num_buf) { 240 i = skb_shinfo(skb)->nr_frags; 241 if (i >= MAX_SKB_FRAGS) { 242 pr_debug("%s: packet too long\n", skb->dev->name); 243 skb->dev->stats.rx_length_errors++; 244 return -EINVAL; 245 } 246 page = virtqueue_get_buf(vi->rvq, &len); 247 if (!page) { 248 pr_debug("%s: rx error: %d buffers missing\n", 249 skb->dev->name, hdr->mhdr.num_buffers); 250 skb->dev->stats.rx_length_errors++; 251 return -EINVAL; 252 } 253 254 if (len > PAGE_SIZE) 255 len = PAGE_SIZE; 256 257 set_skb_frag(skb, page, 0, &len); 258 259 --vi->num; 260 } 261 return 0; 262 } 263 264 static void receive_buf(struct net_device *dev, void *buf, unsigned int len) 265 { 266 struct virtnet_info *vi = netdev_priv(dev); 267 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 268 struct sk_buff *skb; 269 struct page *page; 270 struct skb_vnet_hdr *hdr; 271 272 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { 273 pr_debug("%s: short packet %i\n", dev->name, len); 274 dev->stats.rx_length_errors++; 275 if (vi->mergeable_rx_bufs || vi->big_packets) 276 give_pages(vi, buf); 277 else 278 dev_kfree_skb(buf); 279 return; 280 } 281 282 if (!vi->mergeable_rx_bufs && !vi->big_packets) { 283 skb = buf; 284 len -= sizeof(struct virtio_net_hdr); 285 skb_trim(skb, len); 286 } else { 287 page = buf; 288 skb = page_to_skb(vi, page, len); 289 if (unlikely(!skb)) { 290 dev->stats.rx_dropped++; 291 give_pages(vi, page); 292 return; 293 } 294 if (vi->mergeable_rx_bufs) 295 if (receive_mergeable(vi, skb)) { 296 dev_kfree_skb(skb); 297 return; 298 } 299 } 300 301 hdr = skb_vnet_hdr(skb); 302 303 u64_stats_update_begin(&stats->syncp); 304 stats->rx_bytes += skb->len; 305 stats->rx_packets++; 306 u64_stats_update_end(&stats->syncp); 307 308 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 309 pr_debug("Needs csum!\n"); 310 if (!skb_partial_csum_set(skb, 311 hdr->hdr.csum_start, 312 hdr->hdr.csum_offset)) 313 goto frame_err; 314 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { 315 skb->ip_summed = CHECKSUM_UNNECESSARY; 316 } 317 318 skb->protocol = eth_type_trans(skb, dev); 319 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 320 ntohs(skb->protocol), skb->len, skb->pkt_type); 321 322 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { 323 pr_debug("GSO!\n"); 324 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 325 case VIRTIO_NET_HDR_GSO_TCPV4: 326 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 327 break; 328 case VIRTIO_NET_HDR_GSO_UDP: 329 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 330 break; 331 case VIRTIO_NET_HDR_GSO_TCPV6: 332 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 333 break; 334 default: 335 if (net_ratelimit()) 336 printk(KERN_WARNING "%s: bad gso type %u.\n", 337 dev->name, hdr->hdr.gso_type); 338 goto frame_err; 339 } 340 341 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 342 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 343 344 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; 345 if (skb_shinfo(skb)->gso_size == 0) { 346 if (net_ratelimit()) 347 printk(KERN_WARNING "%s: zero gso size.\n", 348 dev->name); 349 goto frame_err; 350 } 351 352 /* Header must be checked, and gso_segs computed. */ 353 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 354 skb_shinfo(skb)->gso_segs = 0; 355 } 356 357 netif_receive_skb(skb); 358 return; 359 360 frame_err: 361 dev->stats.rx_frame_errors++; 362 dev_kfree_skb(skb); 363 } 364 365 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) 366 { 367 struct sk_buff *skb; 368 struct skb_vnet_hdr *hdr; 369 int err; 370 371 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); 372 if (unlikely(!skb)) 373 return -ENOMEM; 374 375 skb_put(skb, MAX_PACKET_LEN); 376 377 hdr = skb_vnet_hdr(skb); 378 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr); 379 380 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len); 381 382 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp); 383 if (err < 0) 384 dev_kfree_skb(skb); 385 386 return err; 387 } 388 389 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) 390 { 391 struct page *first, *list = NULL; 392 char *p; 393 int i, err, offset; 394 395 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */ 396 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 397 first = get_a_page(vi, gfp); 398 if (!first) { 399 if (list) 400 give_pages(vi, list); 401 return -ENOMEM; 402 } 403 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE); 404 405 /* chain new page in list head to match sg */ 406 first->private = (unsigned long)list; 407 list = first; 408 } 409 410 first = get_a_page(vi, gfp); 411 if (!first) { 412 give_pages(vi, list); 413 return -ENOMEM; 414 } 415 p = page_address(first); 416 417 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */ 418 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */ 419 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr)); 420 421 /* vi->rx_sg[1] for data packet, from offset */ 422 offset = sizeof(struct padded_vnet_hdr); 423 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset); 424 425 /* chain first in list head */ 426 first->private = (unsigned long)list; 427 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2, 428 first, gfp); 429 if (err < 0) 430 give_pages(vi, first); 431 432 return err; 433 } 434 435 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) 436 { 437 struct page *page; 438 int err; 439 440 page = get_a_page(vi, gfp); 441 if (!page) 442 return -ENOMEM; 443 444 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE); 445 446 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp); 447 if (err < 0) 448 give_pages(vi, page); 449 450 return err; 451 } 452 453 /* 454 * Returns false if we couldn't fill entirely (OOM). 455 * 456 * Normally run in the receive path, but can also be run from ndo_open 457 * before we're receiving packets, or from refill_work which is 458 * careful to disable receiving (using napi_disable). 459 */ 460 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) 461 { 462 int err; 463 bool oom; 464 465 do { 466 if (vi->mergeable_rx_bufs) 467 err = add_recvbuf_mergeable(vi, gfp); 468 else if (vi->big_packets) 469 err = add_recvbuf_big(vi, gfp); 470 else 471 err = add_recvbuf_small(vi, gfp); 472 473 oom = err == -ENOMEM; 474 if (err < 0) 475 break; 476 ++vi->num; 477 } while (err > 0); 478 if (unlikely(vi->num > vi->max)) 479 vi->max = vi->num; 480 virtqueue_kick(vi->rvq); 481 return !oom; 482 } 483 484 static void skb_recv_done(struct virtqueue *rvq) 485 { 486 struct virtnet_info *vi = rvq->vdev->priv; 487 /* Schedule NAPI, Suppress further interrupts if successful. */ 488 if (napi_schedule_prep(&vi->napi)) { 489 virtqueue_disable_cb(rvq); 490 __napi_schedule(&vi->napi); 491 } 492 } 493 494 static void virtnet_napi_enable(struct virtnet_info *vi) 495 { 496 napi_enable(&vi->napi); 497 498 /* If all buffers were filled by other side before we napi_enabled, we 499 * won't get another interrupt, so process any outstanding packets 500 * now. virtnet_poll wants re-enable the queue, so we disable here. 501 * We synchronize against interrupts via NAPI_STATE_SCHED */ 502 if (napi_schedule_prep(&vi->napi)) { 503 virtqueue_disable_cb(vi->rvq); 504 local_bh_disable(); 505 __napi_schedule(&vi->napi); 506 local_bh_enable(); 507 } 508 } 509 510 static void refill_work(struct work_struct *work) 511 { 512 struct virtnet_info *vi; 513 bool still_empty; 514 515 vi = container_of(work, struct virtnet_info, refill.work); 516 napi_disable(&vi->napi); 517 still_empty = !try_fill_recv(vi, GFP_KERNEL); 518 virtnet_napi_enable(vi); 519 520 /* In theory, this can happen: if we don't get any buffers in 521 * we will *never* try to fill again. */ 522 if (still_empty) 523 queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2); 524 } 525 526 static int virtnet_poll(struct napi_struct *napi, int budget) 527 { 528 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); 529 void *buf; 530 unsigned int len, received = 0; 531 532 again: 533 while (received < budget && 534 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) { 535 receive_buf(vi->dev, buf, len); 536 --vi->num; 537 received++; 538 } 539 540 if (vi->num < vi->max / 2) { 541 if (!try_fill_recv(vi, GFP_ATOMIC)) 542 queue_delayed_work(system_nrt_wq, &vi->refill, 0); 543 } 544 545 /* Out of packets? */ 546 if (received < budget) { 547 napi_complete(napi); 548 if (unlikely(!virtqueue_enable_cb(vi->rvq)) && 549 napi_schedule_prep(napi)) { 550 virtqueue_disable_cb(vi->rvq); 551 __napi_schedule(napi); 552 goto again; 553 } 554 } 555 556 return received; 557 } 558 559 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) 560 { 561 struct sk_buff *skb; 562 unsigned int len, tot_sgs = 0; 563 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 564 565 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) { 566 pr_debug("Sent skb %p\n", skb); 567 568 u64_stats_update_begin(&stats->syncp); 569 stats->tx_bytes += skb->len; 570 stats->tx_packets++; 571 u64_stats_update_end(&stats->syncp); 572 573 tot_sgs += skb_vnet_hdr(skb)->num_sg; 574 dev_kfree_skb_any(skb); 575 } 576 return tot_sgs; 577 } 578 579 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) 580 { 581 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); 582 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 583 584 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 585 586 if (skb->ip_summed == CHECKSUM_PARTIAL) { 587 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 588 hdr->hdr.csum_start = skb_checksum_start_offset(skb); 589 hdr->hdr.csum_offset = skb->csum_offset; 590 } else { 591 hdr->hdr.flags = 0; 592 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 593 } 594 595 if (skb_is_gso(skb)) { 596 hdr->hdr.hdr_len = skb_headlen(skb); 597 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; 598 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 599 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 600 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 601 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 602 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 603 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; 604 else 605 BUG(); 606 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 607 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 608 } else { 609 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 610 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 611 } 612 613 hdr->mhdr.num_buffers = 0; 614 615 /* Encode metadata header at front. */ 616 if (vi->mergeable_rx_bufs) 617 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr); 618 else 619 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr); 620 621 hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1; 622 return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg, 623 0, skb, GFP_ATOMIC); 624 } 625 626 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 627 { 628 struct virtnet_info *vi = netdev_priv(dev); 629 int capacity; 630 631 /* Free up any pending old buffers before queueing new ones. */ 632 free_old_xmit_skbs(vi); 633 634 /* Try to transmit */ 635 capacity = xmit_skb(vi, skb); 636 637 /* This can happen with OOM and indirect buffers. */ 638 if (unlikely(capacity < 0)) { 639 if (likely(capacity == -ENOMEM)) { 640 if (net_ratelimit()) 641 dev_warn(&dev->dev, 642 "TX queue failure: out of memory\n"); 643 } else { 644 dev->stats.tx_fifo_errors++; 645 if (net_ratelimit()) 646 dev_warn(&dev->dev, 647 "Unexpected TX queue failure: %d\n", 648 capacity); 649 } 650 dev->stats.tx_dropped++; 651 kfree_skb(skb); 652 return NETDEV_TX_OK; 653 } 654 virtqueue_kick(vi->svq); 655 656 /* Don't wait up for transmitted skbs to be freed. */ 657 skb_orphan(skb); 658 nf_reset(skb); 659 660 /* Apparently nice girls don't return TX_BUSY; stop the queue 661 * before it gets out of hand. Naturally, this wastes entries. */ 662 if (capacity < 2+MAX_SKB_FRAGS) { 663 netif_stop_queue(dev); 664 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) { 665 /* More just got used, free them then recheck. */ 666 capacity += free_old_xmit_skbs(vi); 667 if (capacity >= 2+MAX_SKB_FRAGS) { 668 netif_start_queue(dev); 669 virtqueue_disable_cb(vi->svq); 670 } 671 } 672 } 673 674 return NETDEV_TX_OK; 675 } 676 677 static int virtnet_set_mac_address(struct net_device *dev, void *p) 678 { 679 struct virtnet_info *vi = netdev_priv(dev); 680 struct virtio_device *vdev = vi->vdev; 681 int ret; 682 683 ret = eth_mac_addr(dev, p); 684 if (ret) 685 return ret; 686 687 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 688 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), 689 dev->dev_addr, dev->addr_len); 690 691 return 0; 692 } 693 694 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 695 struct rtnl_link_stats64 *tot) 696 { 697 struct virtnet_info *vi = netdev_priv(dev); 698 int cpu; 699 unsigned int start; 700 701 for_each_possible_cpu(cpu) { 702 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 703 u64 tpackets, tbytes, rpackets, rbytes; 704 705 do { 706 start = u64_stats_fetch_begin(&stats->syncp); 707 tpackets = stats->tx_packets; 708 tbytes = stats->tx_bytes; 709 rpackets = stats->rx_packets; 710 rbytes = stats->rx_bytes; 711 } while (u64_stats_fetch_retry(&stats->syncp, start)); 712 713 tot->rx_packets += rpackets; 714 tot->tx_packets += tpackets; 715 tot->rx_bytes += rbytes; 716 tot->tx_bytes += tbytes; 717 } 718 719 tot->tx_dropped = dev->stats.tx_dropped; 720 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 721 tot->rx_dropped = dev->stats.rx_dropped; 722 tot->rx_length_errors = dev->stats.rx_length_errors; 723 tot->rx_frame_errors = dev->stats.rx_frame_errors; 724 725 return tot; 726 } 727 728 #ifdef CONFIG_NET_POLL_CONTROLLER 729 static void virtnet_netpoll(struct net_device *dev) 730 { 731 struct virtnet_info *vi = netdev_priv(dev); 732 733 napi_schedule(&vi->napi); 734 } 735 #endif 736 737 static int virtnet_open(struct net_device *dev) 738 { 739 struct virtnet_info *vi = netdev_priv(dev); 740 741 /* Make sure we have some buffers: if oom use wq. */ 742 if (!try_fill_recv(vi, GFP_KERNEL)) 743 queue_delayed_work(system_nrt_wq, &vi->refill, 0); 744 745 virtnet_napi_enable(vi); 746 return 0; 747 } 748 749 /* 750 * Send command via the control virtqueue and check status. Commands 751 * supported by the hypervisor, as indicated by feature bits, should 752 * never fail unless improperly formated. 753 */ 754 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 755 struct scatterlist *data, int out, int in) 756 { 757 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; 758 struct virtio_net_ctrl_hdr ctrl; 759 virtio_net_ctrl_ack status = ~0; 760 unsigned int tmp; 761 int i; 762 763 /* Caller should know better */ 764 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || 765 (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); 766 767 out++; /* Add header */ 768 in++; /* Add return status */ 769 770 ctrl.class = class; 771 ctrl.cmd = cmd; 772 773 sg_init_table(sg, out + in); 774 775 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); 776 for_each_sg(data, s, out + in - 2, i) 777 sg_set_buf(&sg[i + 1], sg_virt(s), s->length); 778 sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); 779 780 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); 781 782 virtqueue_kick(vi->cvq); 783 784 /* 785 * Spin for a response, the kick causes an ioport write, trapping 786 * into the hypervisor, so the request should be handled immediately. 787 */ 788 while (!virtqueue_get_buf(vi->cvq, &tmp)) 789 cpu_relax(); 790 791 return status == VIRTIO_NET_OK; 792 } 793 794 static void virtnet_ack_link_announce(struct virtnet_info *vi) 795 { 796 rtnl_lock(); 797 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 798 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, 799 0, 0)) 800 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 801 rtnl_unlock(); 802 } 803 804 static int virtnet_close(struct net_device *dev) 805 { 806 struct virtnet_info *vi = netdev_priv(dev); 807 808 /* Make sure refill_work doesn't re-enable napi! */ 809 cancel_delayed_work_sync(&vi->refill); 810 napi_disable(&vi->napi); 811 812 return 0; 813 } 814 815 static void virtnet_set_rx_mode(struct net_device *dev) 816 { 817 struct virtnet_info *vi = netdev_priv(dev); 818 struct scatterlist sg[2]; 819 u8 promisc, allmulti; 820 struct virtio_net_ctrl_mac *mac_data; 821 struct netdev_hw_addr *ha; 822 int uc_count; 823 int mc_count; 824 void *buf; 825 int i; 826 827 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ 828 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 829 return; 830 831 promisc = ((dev->flags & IFF_PROMISC) != 0); 832 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 833 834 sg_init_one(sg, &promisc, sizeof(promisc)); 835 836 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 837 VIRTIO_NET_CTRL_RX_PROMISC, 838 sg, 1, 0)) 839 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 840 promisc ? "en" : "dis"); 841 842 sg_init_one(sg, &allmulti, sizeof(allmulti)); 843 844 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 845 VIRTIO_NET_CTRL_RX_ALLMULTI, 846 sg, 1, 0)) 847 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 848 allmulti ? "en" : "dis"); 849 850 uc_count = netdev_uc_count(dev); 851 mc_count = netdev_mc_count(dev); 852 /* MAC filter - use one buffer for both lists */ 853 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 854 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 855 mac_data = buf; 856 if (!buf) { 857 dev_warn(&dev->dev, "No memory for MAC address buffer\n"); 858 return; 859 } 860 861 sg_init_table(sg, 2); 862 863 /* Store the unicast list and count in the front of the buffer */ 864 mac_data->entries = uc_count; 865 i = 0; 866 netdev_for_each_uc_addr(ha, dev) 867 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 868 869 sg_set_buf(&sg[0], mac_data, 870 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 871 872 /* multicast list and count fill the end */ 873 mac_data = (void *)&mac_data->macs[uc_count][0]; 874 875 mac_data->entries = mc_count; 876 i = 0; 877 netdev_for_each_mc_addr(ha, dev) 878 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 879 880 sg_set_buf(&sg[1], mac_data, 881 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 882 883 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 884 VIRTIO_NET_CTRL_MAC_TABLE_SET, 885 sg, 2, 0)) 886 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); 887 888 kfree(buf); 889 } 890 891 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) 892 { 893 struct virtnet_info *vi = netdev_priv(dev); 894 struct scatterlist sg; 895 896 sg_init_one(&sg, &vid, sizeof(vid)); 897 898 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 899 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) 900 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 901 return 0; 902 } 903 904 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) 905 { 906 struct virtnet_info *vi = netdev_priv(dev); 907 struct scatterlist sg; 908 909 sg_init_one(&sg, &vid, sizeof(vid)); 910 911 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 912 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) 913 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 914 return 0; 915 } 916 917 static void virtnet_get_ringparam(struct net_device *dev, 918 struct ethtool_ringparam *ring) 919 { 920 struct virtnet_info *vi = netdev_priv(dev); 921 922 ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq); 923 ring->tx_max_pending = virtqueue_get_vring_size(vi->svq); 924 ring->rx_pending = ring->rx_max_pending; 925 ring->tx_pending = ring->tx_max_pending; 926 927 } 928 929 930 static void virtnet_get_drvinfo(struct net_device *dev, 931 struct ethtool_drvinfo *info) 932 { 933 struct virtnet_info *vi = netdev_priv(dev); 934 struct virtio_device *vdev = vi->vdev; 935 936 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 937 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 938 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 939 940 } 941 942 static const struct ethtool_ops virtnet_ethtool_ops = { 943 .get_drvinfo = virtnet_get_drvinfo, 944 .get_link = ethtool_op_get_link, 945 .get_ringparam = virtnet_get_ringparam, 946 }; 947 948 #define MIN_MTU 68 949 #define MAX_MTU 65535 950 951 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 952 { 953 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 954 return -EINVAL; 955 dev->mtu = new_mtu; 956 return 0; 957 } 958 959 static const struct net_device_ops virtnet_netdev = { 960 .ndo_open = virtnet_open, 961 .ndo_stop = virtnet_close, 962 .ndo_start_xmit = start_xmit, 963 .ndo_validate_addr = eth_validate_addr, 964 .ndo_set_mac_address = virtnet_set_mac_address, 965 .ndo_set_rx_mode = virtnet_set_rx_mode, 966 .ndo_change_mtu = virtnet_change_mtu, 967 .ndo_get_stats64 = virtnet_stats, 968 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 969 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 970 #ifdef CONFIG_NET_POLL_CONTROLLER 971 .ndo_poll_controller = virtnet_netpoll, 972 #endif 973 }; 974 975 static void virtnet_config_changed_work(struct work_struct *work) 976 { 977 struct virtnet_info *vi = 978 container_of(work, struct virtnet_info, config_work); 979 u16 v; 980 981 mutex_lock(&vi->config_lock); 982 if (!vi->config_enable) 983 goto done; 984 985 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, 986 offsetof(struct virtio_net_config, status), 987 &v) < 0) 988 goto done; 989 990 if (v & VIRTIO_NET_S_ANNOUNCE) { 991 netif_notify_peers(vi->dev); 992 virtnet_ack_link_announce(vi); 993 } 994 995 /* Ignore unknown (future) status bits */ 996 v &= VIRTIO_NET_S_LINK_UP; 997 998 if (vi->status == v) 999 goto done; 1000 1001 vi->status = v; 1002 1003 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1004 netif_carrier_on(vi->dev); 1005 netif_wake_queue(vi->dev); 1006 } else { 1007 netif_carrier_off(vi->dev); 1008 netif_stop_queue(vi->dev); 1009 } 1010 done: 1011 mutex_unlock(&vi->config_lock); 1012 } 1013 1014 static void virtnet_config_changed(struct virtio_device *vdev) 1015 { 1016 struct virtnet_info *vi = vdev->priv; 1017 1018 queue_work(system_nrt_wq, &vi->config_work); 1019 } 1020 1021 static int init_vqs(struct virtnet_info *vi) 1022 { 1023 struct virtqueue *vqs[3]; 1024 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; 1025 const char *names[] = { "input", "output", "control" }; 1026 int nvqs, err; 1027 1028 /* We expect two virtqueues, receive then send, 1029 * and optionally control. */ 1030 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; 1031 1032 err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names); 1033 if (err) 1034 return err; 1035 1036 vi->rvq = vqs[0]; 1037 vi->svq = vqs[1]; 1038 1039 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { 1040 vi->cvq = vqs[2]; 1041 1042 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1043 vi->dev->features |= NETIF_F_HW_VLAN_FILTER; 1044 } 1045 return 0; 1046 } 1047 1048 static int virtnet_probe(struct virtio_device *vdev) 1049 { 1050 int err; 1051 struct net_device *dev; 1052 struct virtnet_info *vi; 1053 1054 /* Allocate ourselves a network device with room for our info */ 1055 dev = alloc_etherdev(sizeof(struct virtnet_info)); 1056 if (!dev) 1057 return -ENOMEM; 1058 1059 /* Set up network device as normal. */ 1060 dev->priv_flags |= IFF_UNICAST_FLT; 1061 dev->netdev_ops = &virtnet_netdev; 1062 dev->features = NETIF_F_HIGHDMA; 1063 1064 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); 1065 SET_NETDEV_DEV(dev, &vdev->dev); 1066 1067 /* Do we support "hardware" checksums? */ 1068 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1069 /* This opens up the world of extra features. */ 1070 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1071 if (csum) 1072 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1073 1074 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1075 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1076 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1077 } 1078 /* Individual feature bits: what can host handle? */ 1079 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1080 dev->hw_features |= NETIF_F_TSO; 1081 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1082 dev->hw_features |= NETIF_F_TSO6; 1083 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1084 dev->hw_features |= NETIF_F_TSO_ECN; 1085 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1086 dev->hw_features |= NETIF_F_UFO; 1087 1088 if (gso) 1089 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1090 /* (!csum && gso) case will be fixed by register_netdev() */ 1091 } 1092 1093 /* Configuration may specify what MAC to use. Otherwise random. */ 1094 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, 1095 offsetof(struct virtio_net_config, mac), 1096 dev->dev_addr, dev->addr_len) < 0) 1097 eth_hw_addr_random(dev); 1098 1099 /* Set up our device-specific information */ 1100 vi = netdev_priv(dev); 1101 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); 1102 vi->dev = dev; 1103 vi->vdev = vdev; 1104 vdev->priv = vi; 1105 vi->pages = NULL; 1106 vi->stats = alloc_percpu(struct virtnet_stats); 1107 err = -ENOMEM; 1108 if (vi->stats == NULL) 1109 goto free; 1110 1111 INIT_DELAYED_WORK(&vi->refill, refill_work); 1112 mutex_init(&vi->config_lock); 1113 vi->config_enable = true; 1114 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1115 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg)); 1116 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg)); 1117 1118 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1119 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1120 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1121 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) 1122 vi->big_packets = true; 1123 1124 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1125 vi->mergeable_rx_bufs = true; 1126 1127 err = init_vqs(vi); 1128 if (err) 1129 goto free_stats; 1130 1131 err = register_netdev(dev); 1132 if (err) { 1133 pr_debug("virtio_net: registering device failed\n"); 1134 goto free_vqs; 1135 } 1136 1137 /* Last of all, set up some receive buffers. */ 1138 try_fill_recv(vi, GFP_KERNEL); 1139 1140 /* If we didn't even get one input buffer, we're useless. */ 1141 if (vi->num == 0) { 1142 err = -ENOMEM; 1143 goto unregister; 1144 } 1145 1146 /* Assume link up if device can't report link status, 1147 otherwise get link status from config. */ 1148 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1149 netif_carrier_off(dev); 1150 queue_work(system_nrt_wq, &vi->config_work); 1151 } else { 1152 vi->status = VIRTIO_NET_S_LINK_UP; 1153 netif_carrier_on(dev); 1154 } 1155 1156 pr_debug("virtnet: registered device %s\n", dev->name); 1157 return 0; 1158 1159 unregister: 1160 unregister_netdev(dev); 1161 free_vqs: 1162 vdev->config->del_vqs(vdev); 1163 free_stats: 1164 free_percpu(vi->stats); 1165 free: 1166 free_netdev(dev); 1167 return err; 1168 } 1169 1170 static void free_unused_bufs(struct virtnet_info *vi) 1171 { 1172 void *buf; 1173 while (1) { 1174 buf = virtqueue_detach_unused_buf(vi->svq); 1175 if (!buf) 1176 break; 1177 dev_kfree_skb(buf); 1178 } 1179 while (1) { 1180 buf = virtqueue_detach_unused_buf(vi->rvq); 1181 if (!buf) 1182 break; 1183 if (vi->mergeable_rx_bufs || vi->big_packets) 1184 give_pages(vi, buf); 1185 else 1186 dev_kfree_skb(buf); 1187 --vi->num; 1188 } 1189 BUG_ON(vi->num != 0); 1190 } 1191 1192 static void remove_vq_common(struct virtnet_info *vi) 1193 { 1194 vi->vdev->config->reset(vi->vdev); 1195 1196 /* Free unused buffers in both send and recv, if any. */ 1197 free_unused_bufs(vi); 1198 1199 vi->vdev->config->del_vqs(vi->vdev); 1200 1201 while (vi->pages) 1202 __free_pages(get_a_page(vi, GFP_KERNEL), 0); 1203 } 1204 1205 static void __devexit virtnet_remove(struct virtio_device *vdev) 1206 { 1207 struct virtnet_info *vi = vdev->priv; 1208 1209 /* Prevent config work handler from accessing the device. */ 1210 mutex_lock(&vi->config_lock); 1211 vi->config_enable = false; 1212 mutex_unlock(&vi->config_lock); 1213 1214 unregister_netdev(vi->dev); 1215 1216 remove_vq_common(vi); 1217 1218 flush_work(&vi->config_work); 1219 1220 free_percpu(vi->stats); 1221 free_netdev(vi->dev); 1222 } 1223 1224 #ifdef CONFIG_PM 1225 static int virtnet_freeze(struct virtio_device *vdev) 1226 { 1227 struct virtnet_info *vi = vdev->priv; 1228 1229 /* Prevent config work handler from accessing the device */ 1230 mutex_lock(&vi->config_lock); 1231 vi->config_enable = false; 1232 mutex_unlock(&vi->config_lock); 1233 1234 virtqueue_disable_cb(vi->rvq); 1235 virtqueue_disable_cb(vi->svq); 1236 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) 1237 virtqueue_disable_cb(vi->cvq); 1238 1239 netif_device_detach(vi->dev); 1240 cancel_delayed_work_sync(&vi->refill); 1241 1242 if (netif_running(vi->dev)) 1243 napi_disable(&vi->napi); 1244 1245 remove_vq_common(vi); 1246 1247 flush_work(&vi->config_work); 1248 1249 return 0; 1250 } 1251 1252 static int virtnet_restore(struct virtio_device *vdev) 1253 { 1254 struct virtnet_info *vi = vdev->priv; 1255 int err; 1256 1257 err = init_vqs(vi); 1258 if (err) 1259 return err; 1260 1261 if (netif_running(vi->dev)) 1262 virtnet_napi_enable(vi); 1263 1264 netif_device_attach(vi->dev); 1265 1266 if (!try_fill_recv(vi, GFP_KERNEL)) 1267 queue_delayed_work(system_nrt_wq, &vi->refill, 0); 1268 1269 mutex_lock(&vi->config_lock); 1270 vi->config_enable = true; 1271 mutex_unlock(&vi->config_lock); 1272 1273 return 0; 1274 } 1275 #endif 1276 1277 static struct virtio_device_id id_table[] = { 1278 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1279 { 0 }, 1280 }; 1281 1282 static unsigned int features[] = { 1283 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1284 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1285 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 1286 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 1287 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 1288 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 1289 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 1290 VIRTIO_NET_F_GUEST_ANNOUNCE, 1291 }; 1292 1293 static struct virtio_driver virtio_net_driver = { 1294 .feature_table = features, 1295 .feature_table_size = ARRAY_SIZE(features), 1296 .driver.name = KBUILD_MODNAME, 1297 .driver.owner = THIS_MODULE, 1298 .id_table = id_table, 1299 .probe = virtnet_probe, 1300 .remove = __devexit_p(virtnet_remove), 1301 .config_changed = virtnet_config_changed, 1302 #ifdef CONFIG_PM 1303 .freeze = virtnet_freeze, 1304 .restore = virtnet_restore, 1305 #endif 1306 }; 1307 1308 static int __init init(void) 1309 { 1310 return register_virtio_driver(&virtio_net_driver); 1311 } 1312 1313 static void __exit fini(void) 1314 { 1315 unregister_virtio_driver(&virtio_net_driver); 1316 } 1317 module_init(init); 1318 module_exit(fini); 1319 1320 MODULE_DEVICE_TABLE(virtio, id_table); 1321 MODULE_DESCRIPTION("Virtio network driver"); 1322 MODULE_LICENSE("GPL"); 1323