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 tx_syncp; 46 struct u64_stats_sync rx_syncp; 47 u64 tx_bytes; 48 u64 tx_packets; 49 50 u64 rx_bytes; 51 u64 rx_packets; 52 }; 53 54 struct virtnet_info { 55 struct virtio_device *vdev; 56 struct virtqueue *rvq, *svq, *cvq; 57 struct net_device *dev; 58 struct napi_struct napi; 59 unsigned int status; 60 61 /* Number of input buffers, and max we've ever had. */ 62 unsigned int num, max; 63 64 /* I like... big packets and I cannot lie! */ 65 bool big_packets; 66 67 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 68 bool mergeable_rx_bufs; 69 70 /* enable config space updates */ 71 bool config_enable; 72 73 /* Active statistics */ 74 struct virtnet_stats __percpu *stats; 75 76 /* Work struct for refilling if we run low on memory. */ 77 struct delayed_work refill; 78 79 /* Work struct for config space updates */ 80 struct work_struct config_work; 81 82 /* Lock for config space updates */ 83 struct mutex config_lock; 84 85 /* Chain pages by the private ptr. */ 86 struct page *pages; 87 88 /* fragments + linear part + virtio header */ 89 struct scatterlist rx_sg[MAX_SKB_FRAGS + 2]; 90 struct scatterlist tx_sg[MAX_SKB_FRAGS + 2]; 91 }; 92 93 struct skb_vnet_hdr { 94 union { 95 struct virtio_net_hdr hdr; 96 struct virtio_net_hdr_mrg_rxbuf mhdr; 97 }; 98 unsigned int num_sg; 99 }; 100 101 struct padded_vnet_hdr { 102 struct virtio_net_hdr hdr; 103 /* 104 * virtio_net_hdr should be in a separated sg buffer because of a 105 * QEMU bug, and data sg buffer shares same page with this header sg. 106 * This padding makes next sg 16 byte aligned after virtio_net_hdr. 107 */ 108 char padding[6]; 109 }; 110 111 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) 112 { 113 return (struct skb_vnet_hdr *)skb->cb; 114 } 115 116 /* 117 * private is used to chain pages for big packets, put the whole 118 * most recent used list in the beginning for reuse 119 */ 120 static void give_pages(struct virtnet_info *vi, struct page *page) 121 { 122 struct page *end; 123 124 /* Find end of list, sew whole thing into vi->pages. */ 125 for (end = page; end->private; end = (struct page *)end->private); 126 end->private = (unsigned long)vi->pages; 127 vi->pages = page; 128 } 129 130 static struct page *get_a_page(struct virtnet_info *vi, gfp_t gfp_mask) 131 { 132 struct page *p = vi->pages; 133 134 if (p) { 135 vi->pages = (struct page *)p->private; 136 /* clear private here, it is used to chain pages */ 137 p->private = 0; 138 } else 139 p = alloc_page(gfp_mask); 140 return p; 141 } 142 143 static void skb_xmit_done(struct virtqueue *svq) 144 { 145 struct virtnet_info *vi = svq->vdev->priv; 146 147 /* Suppress further interrupts. */ 148 virtqueue_disable_cb(svq); 149 150 /* We were probably waiting for more output buffers. */ 151 netif_wake_queue(vi->dev); 152 } 153 154 static void set_skb_frag(struct sk_buff *skb, struct page *page, 155 unsigned int offset, unsigned int *len) 156 { 157 int size = min((unsigned)PAGE_SIZE - offset, *len); 158 int i = skb_shinfo(skb)->nr_frags; 159 160 __skb_fill_page_desc(skb, i, page, offset, size); 161 162 skb->data_len += size; 163 skb->len += size; 164 skb->truesize += PAGE_SIZE; 165 skb_shinfo(skb)->nr_frags++; 166 *len -= size; 167 } 168 169 /* Called from bottom half context */ 170 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 171 struct page *page, unsigned int len) 172 { 173 struct sk_buff *skb; 174 struct skb_vnet_hdr *hdr; 175 unsigned int copy, hdr_len, offset; 176 char *p; 177 178 p = page_address(page); 179 180 /* copy small packet so we can reuse these pages for small data */ 181 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); 182 if (unlikely(!skb)) 183 return NULL; 184 185 hdr = skb_vnet_hdr(skb); 186 187 if (vi->mergeable_rx_bufs) { 188 hdr_len = sizeof hdr->mhdr; 189 offset = hdr_len; 190 } else { 191 hdr_len = sizeof hdr->hdr; 192 offset = sizeof(struct padded_vnet_hdr); 193 } 194 195 memcpy(hdr, p, hdr_len); 196 197 len -= hdr_len; 198 p += offset; 199 200 copy = len; 201 if (copy > skb_tailroom(skb)) 202 copy = skb_tailroom(skb); 203 memcpy(skb_put(skb, copy), p, copy); 204 205 len -= copy; 206 offset += copy; 207 208 /* 209 * Verify that we can indeed put this data into a skb. 210 * This is here to handle cases when the device erroneously 211 * tries to receive more than is possible. This is usually 212 * the case of a broken device. 213 */ 214 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 215 if (net_ratelimit()) 216 pr_debug("%s: too much data\n", skb->dev->name); 217 dev_kfree_skb(skb); 218 return NULL; 219 } 220 221 while (len) { 222 set_skb_frag(skb, page, offset, &len); 223 page = (struct page *)page->private; 224 offset = 0; 225 } 226 227 if (page) 228 give_pages(vi, page); 229 230 return skb; 231 } 232 233 static int receive_mergeable(struct virtnet_info *vi, struct sk_buff *skb) 234 { 235 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); 236 struct page *page; 237 int num_buf, i, len; 238 239 num_buf = hdr->mhdr.num_buffers; 240 while (--num_buf) { 241 i = skb_shinfo(skb)->nr_frags; 242 if (i >= MAX_SKB_FRAGS) { 243 pr_debug("%s: packet too long\n", skb->dev->name); 244 skb->dev->stats.rx_length_errors++; 245 return -EINVAL; 246 } 247 page = virtqueue_get_buf(vi->rvq, &len); 248 if (!page) { 249 pr_debug("%s: rx error: %d buffers missing\n", 250 skb->dev->name, hdr->mhdr.num_buffers); 251 skb->dev->stats.rx_length_errors++; 252 return -EINVAL; 253 } 254 255 if (len > PAGE_SIZE) 256 len = PAGE_SIZE; 257 258 set_skb_frag(skb, page, 0, &len); 259 260 --vi->num; 261 } 262 return 0; 263 } 264 265 static void receive_buf(struct net_device *dev, void *buf, unsigned int len) 266 { 267 struct virtnet_info *vi = netdev_priv(dev); 268 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 269 struct sk_buff *skb; 270 struct page *page; 271 struct skb_vnet_hdr *hdr; 272 273 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { 274 pr_debug("%s: short packet %i\n", dev->name, len); 275 dev->stats.rx_length_errors++; 276 if (vi->mergeable_rx_bufs || vi->big_packets) 277 give_pages(vi, buf); 278 else 279 dev_kfree_skb(buf); 280 return; 281 } 282 283 if (!vi->mergeable_rx_bufs && !vi->big_packets) { 284 skb = buf; 285 len -= sizeof(struct virtio_net_hdr); 286 skb_trim(skb, len); 287 } else { 288 page = buf; 289 skb = page_to_skb(vi, page, len); 290 if (unlikely(!skb)) { 291 dev->stats.rx_dropped++; 292 give_pages(vi, page); 293 return; 294 } 295 if (vi->mergeable_rx_bufs) 296 if (receive_mergeable(vi, skb)) { 297 dev_kfree_skb(skb); 298 return; 299 } 300 } 301 302 hdr = skb_vnet_hdr(skb); 303 304 u64_stats_update_begin(&stats->rx_syncp); 305 stats->rx_bytes += skb->len; 306 stats->rx_packets++; 307 u64_stats_update_end(&stats->rx_syncp); 308 309 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 310 pr_debug("Needs csum!\n"); 311 if (!skb_partial_csum_set(skb, 312 hdr->hdr.csum_start, 313 hdr->hdr.csum_offset)) 314 goto frame_err; 315 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { 316 skb->ip_summed = CHECKSUM_UNNECESSARY; 317 } 318 319 skb->protocol = eth_type_trans(skb, dev); 320 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 321 ntohs(skb->protocol), skb->len, skb->pkt_type); 322 323 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { 324 pr_debug("GSO!\n"); 325 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 326 case VIRTIO_NET_HDR_GSO_TCPV4: 327 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 328 break; 329 case VIRTIO_NET_HDR_GSO_UDP: 330 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 331 break; 332 case VIRTIO_NET_HDR_GSO_TCPV6: 333 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 334 break; 335 default: 336 if (net_ratelimit()) 337 printk(KERN_WARNING "%s: bad gso type %u.\n", 338 dev->name, hdr->hdr.gso_type); 339 goto frame_err; 340 } 341 342 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 343 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 344 345 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; 346 if (skb_shinfo(skb)->gso_size == 0) { 347 if (net_ratelimit()) 348 printk(KERN_WARNING "%s: zero gso size.\n", 349 dev->name); 350 goto frame_err; 351 } 352 353 /* Header must be checked, and gso_segs computed. */ 354 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 355 skb_shinfo(skb)->gso_segs = 0; 356 } 357 358 netif_receive_skb(skb); 359 return; 360 361 frame_err: 362 dev->stats.rx_frame_errors++; 363 dev_kfree_skb(skb); 364 } 365 366 static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp) 367 { 368 struct sk_buff *skb; 369 struct skb_vnet_hdr *hdr; 370 int err; 371 372 skb = __netdev_alloc_skb_ip_align(vi->dev, MAX_PACKET_LEN, gfp); 373 if (unlikely(!skb)) 374 return -ENOMEM; 375 376 skb_put(skb, MAX_PACKET_LEN); 377 378 hdr = skb_vnet_hdr(skb); 379 sg_set_buf(vi->rx_sg, &hdr->hdr, sizeof hdr->hdr); 380 381 skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len); 382 383 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp); 384 if (err < 0) 385 dev_kfree_skb(skb); 386 387 return err; 388 } 389 390 static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp) 391 { 392 struct page *first, *list = NULL; 393 char *p; 394 int i, err, offset; 395 396 /* page in vi->rx_sg[MAX_SKB_FRAGS + 1] is list tail */ 397 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 398 first = get_a_page(vi, gfp); 399 if (!first) { 400 if (list) 401 give_pages(vi, list); 402 return -ENOMEM; 403 } 404 sg_set_buf(&vi->rx_sg[i], page_address(first), PAGE_SIZE); 405 406 /* chain new page in list head to match sg */ 407 first->private = (unsigned long)list; 408 list = first; 409 } 410 411 first = get_a_page(vi, gfp); 412 if (!first) { 413 give_pages(vi, list); 414 return -ENOMEM; 415 } 416 p = page_address(first); 417 418 /* vi->rx_sg[0], vi->rx_sg[1] share the same page */ 419 /* a separated vi->rx_sg[0] for virtio_net_hdr only due to QEMU bug */ 420 sg_set_buf(&vi->rx_sg[0], p, sizeof(struct virtio_net_hdr)); 421 422 /* vi->rx_sg[1] for data packet, from offset */ 423 offset = sizeof(struct padded_vnet_hdr); 424 sg_set_buf(&vi->rx_sg[1], p + offset, PAGE_SIZE - offset); 425 426 /* chain first in list head */ 427 first->private = (unsigned long)list; 428 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2, 429 first, gfp); 430 if (err < 0) 431 give_pages(vi, first); 432 433 return err; 434 } 435 436 static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp) 437 { 438 struct page *page; 439 int err; 440 441 page = get_a_page(vi, gfp); 442 if (!page) 443 return -ENOMEM; 444 445 sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE); 446 447 err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp); 448 if (err < 0) 449 give_pages(vi, page); 450 451 return err; 452 } 453 454 /* 455 * Returns false if we couldn't fill entirely (OOM). 456 * 457 * Normally run in the receive path, but can also be run from ndo_open 458 * before we're receiving packets, or from refill_work which is 459 * careful to disable receiving (using napi_disable). 460 */ 461 static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp) 462 { 463 int err; 464 bool oom; 465 466 do { 467 if (vi->mergeable_rx_bufs) 468 err = add_recvbuf_mergeable(vi, gfp); 469 else if (vi->big_packets) 470 err = add_recvbuf_big(vi, gfp); 471 else 472 err = add_recvbuf_small(vi, gfp); 473 474 oom = err == -ENOMEM; 475 if (err < 0) 476 break; 477 ++vi->num; 478 } while (err > 0); 479 if (unlikely(vi->num > vi->max)) 480 vi->max = vi->num; 481 virtqueue_kick(vi->rvq); 482 return !oom; 483 } 484 485 static void skb_recv_done(struct virtqueue *rvq) 486 { 487 struct virtnet_info *vi = rvq->vdev->priv; 488 /* Schedule NAPI, Suppress further interrupts if successful. */ 489 if (napi_schedule_prep(&vi->napi)) { 490 virtqueue_disable_cb(rvq); 491 __napi_schedule(&vi->napi); 492 } 493 } 494 495 static void virtnet_napi_enable(struct virtnet_info *vi) 496 { 497 napi_enable(&vi->napi); 498 499 /* If all buffers were filled by other side before we napi_enabled, we 500 * won't get another interrupt, so process any outstanding packets 501 * now. virtnet_poll wants re-enable the queue, so we disable here. 502 * We synchronize against interrupts via NAPI_STATE_SCHED */ 503 if (napi_schedule_prep(&vi->napi)) { 504 virtqueue_disable_cb(vi->rvq); 505 local_bh_disable(); 506 __napi_schedule(&vi->napi); 507 local_bh_enable(); 508 } 509 } 510 511 static void refill_work(struct work_struct *work) 512 { 513 struct virtnet_info *vi; 514 bool still_empty; 515 516 vi = container_of(work, struct virtnet_info, refill.work); 517 napi_disable(&vi->napi); 518 still_empty = !try_fill_recv(vi, GFP_KERNEL); 519 virtnet_napi_enable(vi); 520 521 /* In theory, this can happen: if we don't get any buffers in 522 * we will *never* try to fill again. */ 523 if (still_empty) 524 queue_delayed_work(system_nrt_wq, &vi->refill, HZ/2); 525 } 526 527 static int virtnet_poll(struct napi_struct *napi, int budget) 528 { 529 struct virtnet_info *vi = container_of(napi, struct virtnet_info, napi); 530 void *buf; 531 unsigned int len, received = 0; 532 533 again: 534 while (received < budget && 535 (buf = virtqueue_get_buf(vi->rvq, &len)) != NULL) { 536 receive_buf(vi->dev, buf, len); 537 --vi->num; 538 received++; 539 } 540 541 if (vi->num < vi->max / 2) { 542 if (!try_fill_recv(vi, GFP_ATOMIC)) 543 queue_delayed_work(system_nrt_wq, &vi->refill, 0); 544 } 545 546 /* Out of packets? */ 547 if (received < budget) { 548 napi_complete(napi); 549 if (unlikely(!virtqueue_enable_cb(vi->rvq)) && 550 napi_schedule_prep(napi)) { 551 virtqueue_disable_cb(vi->rvq); 552 __napi_schedule(napi); 553 goto again; 554 } 555 } 556 557 return received; 558 } 559 560 static unsigned int free_old_xmit_skbs(struct virtnet_info *vi) 561 { 562 struct sk_buff *skb; 563 unsigned int len, tot_sgs = 0; 564 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 565 566 while ((skb = virtqueue_get_buf(vi->svq, &len)) != NULL) { 567 pr_debug("Sent skb %p\n", skb); 568 569 u64_stats_update_begin(&stats->tx_syncp); 570 stats->tx_bytes += skb->len; 571 stats->tx_packets++; 572 u64_stats_update_end(&stats->tx_syncp); 573 574 tot_sgs += skb_vnet_hdr(skb)->num_sg; 575 dev_kfree_skb_any(skb); 576 } 577 return tot_sgs; 578 } 579 580 static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb) 581 { 582 struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb); 583 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 584 585 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 586 587 if (skb->ip_summed == CHECKSUM_PARTIAL) { 588 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 589 hdr->hdr.csum_start = skb_checksum_start_offset(skb); 590 hdr->hdr.csum_offset = skb->csum_offset; 591 } else { 592 hdr->hdr.flags = 0; 593 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 594 } 595 596 if (skb_is_gso(skb)) { 597 hdr->hdr.hdr_len = skb_headlen(skb); 598 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; 599 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 600 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 601 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 602 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 603 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 604 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; 605 else 606 BUG(); 607 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 608 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 609 } else { 610 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 611 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 612 } 613 614 hdr->mhdr.num_buffers = 0; 615 616 /* Encode metadata header at front. */ 617 if (vi->mergeable_rx_bufs) 618 sg_set_buf(vi->tx_sg, &hdr->mhdr, sizeof hdr->mhdr); 619 else 620 sg_set_buf(vi->tx_sg, &hdr->hdr, sizeof hdr->hdr); 621 622 hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1; 623 return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg, 624 0, skb, GFP_ATOMIC); 625 } 626 627 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 628 { 629 struct virtnet_info *vi = netdev_priv(dev); 630 int capacity; 631 632 /* Free up any pending old buffers before queueing new ones. */ 633 free_old_xmit_skbs(vi); 634 635 /* Try to transmit */ 636 capacity = xmit_skb(vi, skb); 637 638 /* This can happen with OOM and indirect buffers. */ 639 if (unlikely(capacity < 0)) { 640 if (likely(capacity == -ENOMEM)) { 641 if (net_ratelimit()) 642 dev_warn(&dev->dev, 643 "TX queue failure: out of memory\n"); 644 } else { 645 dev->stats.tx_fifo_errors++; 646 if (net_ratelimit()) 647 dev_warn(&dev->dev, 648 "Unexpected TX queue failure: %d\n", 649 capacity); 650 } 651 dev->stats.tx_dropped++; 652 kfree_skb(skb); 653 return NETDEV_TX_OK; 654 } 655 virtqueue_kick(vi->svq); 656 657 /* Don't wait up for transmitted skbs to be freed. */ 658 skb_orphan(skb); 659 nf_reset(skb); 660 661 /* Apparently nice girls don't return TX_BUSY; stop the queue 662 * before it gets out of hand. Naturally, this wastes entries. */ 663 if (capacity < 2+MAX_SKB_FRAGS) { 664 netif_stop_queue(dev); 665 if (unlikely(!virtqueue_enable_cb_delayed(vi->svq))) { 666 /* More just got used, free them then recheck. */ 667 capacity += free_old_xmit_skbs(vi); 668 if (capacity >= 2+MAX_SKB_FRAGS) { 669 netif_start_queue(dev); 670 virtqueue_disable_cb(vi->svq); 671 } 672 } 673 } 674 675 return NETDEV_TX_OK; 676 } 677 678 static int virtnet_set_mac_address(struct net_device *dev, void *p) 679 { 680 struct virtnet_info *vi = netdev_priv(dev); 681 struct virtio_device *vdev = vi->vdev; 682 int ret; 683 684 ret = eth_mac_addr(dev, p); 685 if (ret) 686 return ret; 687 688 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 689 vdev->config->set(vdev, offsetof(struct virtio_net_config, mac), 690 dev->dev_addr, dev->addr_len); 691 692 return 0; 693 } 694 695 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 696 struct rtnl_link_stats64 *tot) 697 { 698 struct virtnet_info *vi = netdev_priv(dev); 699 int cpu; 700 unsigned int start; 701 702 for_each_possible_cpu(cpu) { 703 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 704 u64 tpackets, tbytes, rpackets, rbytes; 705 706 do { 707 start = u64_stats_fetch_begin_bh(&stats->tx_syncp); 708 tpackets = stats->tx_packets; 709 tbytes = stats->tx_bytes; 710 } while (u64_stats_fetch_retry_bh(&stats->tx_syncp, start)); 711 712 do { 713 start = u64_stats_fetch_begin_bh(&stats->rx_syncp); 714 rpackets = stats->rx_packets; 715 rbytes = stats->rx_bytes; 716 } while (u64_stats_fetch_retry_bh(&stats->rx_syncp, start)); 717 718 tot->rx_packets += rpackets; 719 tot->tx_packets += tpackets; 720 tot->rx_bytes += rbytes; 721 tot->tx_bytes += tbytes; 722 } 723 724 tot->tx_dropped = dev->stats.tx_dropped; 725 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 726 tot->rx_dropped = dev->stats.rx_dropped; 727 tot->rx_length_errors = dev->stats.rx_length_errors; 728 tot->rx_frame_errors = dev->stats.rx_frame_errors; 729 730 return tot; 731 } 732 733 #ifdef CONFIG_NET_POLL_CONTROLLER 734 static void virtnet_netpoll(struct net_device *dev) 735 { 736 struct virtnet_info *vi = netdev_priv(dev); 737 738 napi_schedule(&vi->napi); 739 } 740 #endif 741 742 static int virtnet_open(struct net_device *dev) 743 { 744 struct virtnet_info *vi = netdev_priv(dev); 745 746 /* Make sure we have some buffers: if oom use wq. */ 747 if (!try_fill_recv(vi, GFP_KERNEL)) 748 queue_delayed_work(system_nrt_wq, &vi->refill, 0); 749 750 virtnet_napi_enable(vi); 751 return 0; 752 } 753 754 /* 755 * Send command via the control virtqueue and check status. Commands 756 * supported by the hypervisor, as indicated by feature bits, should 757 * never fail unless improperly formated. 758 */ 759 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 760 struct scatterlist *data, int out, int in) 761 { 762 struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; 763 struct virtio_net_ctrl_hdr ctrl; 764 virtio_net_ctrl_ack status = ~0; 765 unsigned int tmp; 766 int i; 767 768 /* Caller should know better */ 769 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || 770 (out + in > VIRTNET_SEND_COMMAND_SG_MAX)); 771 772 out++; /* Add header */ 773 in++; /* Add return status */ 774 775 ctrl.class = class; 776 ctrl.cmd = cmd; 777 778 sg_init_table(sg, out + in); 779 780 sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); 781 for_each_sg(data, s, out + in - 2, i) 782 sg_set_buf(&sg[i + 1], sg_virt(s), s->length); 783 sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); 784 785 BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0); 786 787 virtqueue_kick(vi->cvq); 788 789 /* 790 * Spin for a response, the kick causes an ioport write, trapping 791 * into the hypervisor, so the request should be handled immediately. 792 */ 793 while (!virtqueue_get_buf(vi->cvq, &tmp)) 794 cpu_relax(); 795 796 return status == VIRTIO_NET_OK; 797 } 798 799 static void virtnet_ack_link_announce(struct virtnet_info *vi) 800 { 801 rtnl_lock(); 802 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 803 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL, 804 0, 0)) 805 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 806 rtnl_unlock(); 807 } 808 809 static int virtnet_close(struct net_device *dev) 810 { 811 struct virtnet_info *vi = netdev_priv(dev); 812 813 /* Make sure refill_work doesn't re-enable napi! */ 814 cancel_delayed_work_sync(&vi->refill); 815 napi_disable(&vi->napi); 816 817 return 0; 818 } 819 820 static void virtnet_set_rx_mode(struct net_device *dev) 821 { 822 struct virtnet_info *vi = netdev_priv(dev); 823 struct scatterlist sg[2]; 824 u8 promisc, allmulti; 825 struct virtio_net_ctrl_mac *mac_data; 826 struct netdev_hw_addr *ha; 827 int uc_count; 828 int mc_count; 829 void *buf; 830 int i; 831 832 /* We can't dynamicaly set ndo_set_rx_mode, so return gracefully */ 833 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 834 return; 835 836 promisc = ((dev->flags & IFF_PROMISC) != 0); 837 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 838 839 sg_init_one(sg, &promisc, sizeof(promisc)); 840 841 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 842 VIRTIO_NET_CTRL_RX_PROMISC, 843 sg, 1, 0)) 844 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 845 promisc ? "en" : "dis"); 846 847 sg_init_one(sg, &allmulti, sizeof(allmulti)); 848 849 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 850 VIRTIO_NET_CTRL_RX_ALLMULTI, 851 sg, 1, 0)) 852 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 853 allmulti ? "en" : "dis"); 854 855 uc_count = netdev_uc_count(dev); 856 mc_count = netdev_mc_count(dev); 857 /* MAC filter - use one buffer for both lists */ 858 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 859 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 860 mac_data = buf; 861 if (!buf) { 862 dev_warn(&dev->dev, "No memory for MAC address buffer\n"); 863 return; 864 } 865 866 sg_init_table(sg, 2); 867 868 /* Store the unicast list and count in the front of the buffer */ 869 mac_data->entries = uc_count; 870 i = 0; 871 netdev_for_each_uc_addr(ha, dev) 872 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 873 874 sg_set_buf(&sg[0], mac_data, 875 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 876 877 /* multicast list and count fill the end */ 878 mac_data = (void *)&mac_data->macs[uc_count][0]; 879 880 mac_data->entries = mc_count; 881 i = 0; 882 netdev_for_each_mc_addr(ha, dev) 883 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 884 885 sg_set_buf(&sg[1], mac_data, 886 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 887 888 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 889 VIRTIO_NET_CTRL_MAC_TABLE_SET, 890 sg, 2, 0)) 891 dev_warn(&dev->dev, "Failed to set MAC fitler table.\n"); 892 893 kfree(buf); 894 } 895 896 static int virtnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) 897 { 898 struct virtnet_info *vi = netdev_priv(dev); 899 struct scatterlist sg; 900 901 sg_init_one(&sg, &vid, sizeof(vid)); 902 903 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 904 VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) 905 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 906 return 0; 907 } 908 909 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) 910 { 911 struct virtnet_info *vi = netdev_priv(dev); 912 struct scatterlist sg; 913 914 sg_init_one(&sg, &vid, sizeof(vid)); 915 916 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 917 VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0)) 918 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 919 return 0; 920 } 921 922 static void virtnet_get_ringparam(struct net_device *dev, 923 struct ethtool_ringparam *ring) 924 { 925 struct virtnet_info *vi = netdev_priv(dev); 926 927 ring->rx_max_pending = virtqueue_get_vring_size(vi->rvq); 928 ring->tx_max_pending = virtqueue_get_vring_size(vi->svq); 929 ring->rx_pending = ring->rx_max_pending; 930 ring->tx_pending = ring->tx_max_pending; 931 932 } 933 934 935 static void virtnet_get_drvinfo(struct net_device *dev, 936 struct ethtool_drvinfo *info) 937 { 938 struct virtnet_info *vi = netdev_priv(dev); 939 struct virtio_device *vdev = vi->vdev; 940 941 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 942 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 943 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 944 945 } 946 947 static const struct ethtool_ops virtnet_ethtool_ops = { 948 .get_drvinfo = virtnet_get_drvinfo, 949 .get_link = ethtool_op_get_link, 950 .get_ringparam = virtnet_get_ringparam, 951 }; 952 953 #define MIN_MTU 68 954 #define MAX_MTU 65535 955 956 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 957 { 958 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 959 return -EINVAL; 960 dev->mtu = new_mtu; 961 return 0; 962 } 963 964 static const struct net_device_ops virtnet_netdev = { 965 .ndo_open = virtnet_open, 966 .ndo_stop = virtnet_close, 967 .ndo_start_xmit = start_xmit, 968 .ndo_validate_addr = eth_validate_addr, 969 .ndo_set_mac_address = virtnet_set_mac_address, 970 .ndo_set_rx_mode = virtnet_set_rx_mode, 971 .ndo_change_mtu = virtnet_change_mtu, 972 .ndo_get_stats64 = virtnet_stats, 973 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 974 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 975 #ifdef CONFIG_NET_POLL_CONTROLLER 976 .ndo_poll_controller = virtnet_netpoll, 977 #endif 978 }; 979 980 static void virtnet_config_changed_work(struct work_struct *work) 981 { 982 struct virtnet_info *vi = 983 container_of(work, struct virtnet_info, config_work); 984 u16 v; 985 986 mutex_lock(&vi->config_lock); 987 if (!vi->config_enable) 988 goto done; 989 990 if (virtio_config_val(vi->vdev, VIRTIO_NET_F_STATUS, 991 offsetof(struct virtio_net_config, status), 992 &v) < 0) 993 goto done; 994 995 if (v & VIRTIO_NET_S_ANNOUNCE) { 996 netif_notify_peers(vi->dev); 997 virtnet_ack_link_announce(vi); 998 } 999 1000 /* Ignore unknown (future) status bits */ 1001 v &= VIRTIO_NET_S_LINK_UP; 1002 1003 if (vi->status == v) 1004 goto done; 1005 1006 vi->status = v; 1007 1008 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1009 netif_carrier_on(vi->dev); 1010 netif_wake_queue(vi->dev); 1011 } else { 1012 netif_carrier_off(vi->dev); 1013 netif_stop_queue(vi->dev); 1014 } 1015 done: 1016 mutex_unlock(&vi->config_lock); 1017 } 1018 1019 static void virtnet_config_changed(struct virtio_device *vdev) 1020 { 1021 struct virtnet_info *vi = vdev->priv; 1022 1023 queue_work(system_nrt_wq, &vi->config_work); 1024 } 1025 1026 static int init_vqs(struct virtnet_info *vi) 1027 { 1028 struct virtqueue *vqs[3]; 1029 vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL}; 1030 const char *names[] = { "input", "output", "control" }; 1031 int nvqs, err; 1032 1033 /* We expect two virtqueues, receive then send, 1034 * and optionally control. */ 1035 nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2; 1036 1037 err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names); 1038 if (err) 1039 return err; 1040 1041 vi->rvq = vqs[0]; 1042 vi->svq = vqs[1]; 1043 1044 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) { 1045 vi->cvq = vqs[2]; 1046 1047 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1048 vi->dev->features |= NETIF_F_HW_VLAN_FILTER; 1049 } 1050 return 0; 1051 } 1052 1053 static int virtnet_probe(struct virtio_device *vdev) 1054 { 1055 int err; 1056 struct net_device *dev; 1057 struct virtnet_info *vi; 1058 1059 /* Allocate ourselves a network device with room for our info */ 1060 dev = alloc_etherdev(sizeof(struct virtnet_info)); 1061 if (!dev) 1062 return -ENOMEM; 1063 1064 /* Set up network device as normal. */ 1065 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1066 dev->netdev_ops = &virtnet_netdev; 1067 dev->features = NETIF_F_HIGHDMA; 1068 1069 SET_ETHTOOL_OPS(dev, &virtnet_ethtool_ops); 1070 SET_NETDEV_DEV(dev, &vdev->dev); 1071 1072 /* Do we support "hardware" checksums? */ 1073 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1074 /* This opens up the world of extra features. */ 1075 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1076 if (csum) 1077 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1078 1079 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1080 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1081 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1082 } 1083 /* Individual feature bits: what can host handle? */ 1084 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1085 dev->hw_features |= NETIF_F_TSO; 1086 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1087 dev->hw_features |= NETIF_F_TSO6; 1088 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1089 dev->hw_features |= NETIF_F_TSO_ECN; 1090 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1091 dev->hw_features |= NETIF_F_UFO; 1092 1093 if (gso) 1094 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1095 /* (!csum && gso) case will be fixed by register_netdev() */ 1096 } 1097 1098 /* Configuration may specify what MAC to use. Otherwise random. */ 1099 if (virtio_config_val_len(vdev, VIRTIO_NET_F_MAC, 1100 offsetof(struct virtio_net_config, mac), 1101 dev->dev_addr, dev->addr_len) < 0) 1102 eth_hw_addr_random(dev); 1103 1104 /* Set up our device-specific information */ 1105 vi = netdev_priv(dev); 1106 netif_napi_add(dev, &vi->napi, virtnet_poll, napi_weight); 1107 vi->dev = dev; 1108 vi->vdev = vdev; 1109 vdev->priv = vi; 1110 vi->pages = NULL; 1111 vi->stats = alloc_percpu(struct virtnet_stats); 1112 err = -ENOMEM; 1113 if (vi->stats == NULL) 1114 goto free; 1115 1116 INIT_DELAYED_WORK(&vi->refill, refill_work); 1117 mutex_init(&vi->config_lock); 1118 vi->config_enable = true; 1119 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1120 sg_init_table(vi->rx_sg, ARRAY_SIZE(vi->rx_sg)); 1121 sg_init_table(vi->tx_sg, ARRAY_SIZE(vi->tx_sg)); 1122 1123 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1124 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1125 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1126 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) 1127 vi->big_packets = true; 1128 1129 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1130 vi->mergeable_rx_bufs = true; 1131 1132 err = init_vqs(vi); 1133 if (err) 1134 goto free_stats; 1135 1136 err = register_netdev(dev); 1137 if (err) { 1138 pr_debug("virtio_net: registering device failed\n"); 1139 goto free_vqs; 1140 } 1141 1142 /* Last of all, set up some receive buffers. */ 1143 try_fill_recv(vi, GFP_KERNEL); 1144 1145 /* If we didn't even get one input buffer, we're useless. */ 1146 if (vi->num == 0) { 1147 err = -ENOMEM; 1148 goto unregister; 1149 } 1150 1151 /* Assume link up if device can't report link status, 1152 otherwise get link status from config. */ 1153 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1154 netif_carrier_off(dev); 1155 queue_work(system_nrt_wq, &vi->config_work); 1156 } else { 1157 vi->status = VIRTIO_NET_S_LINK_UP; 1158 netif_carrier_on(dev); 1159 } 1160 1161 pr_debug("virtnet: registered device %s\n", dev->name); 1162 return 0; 1163 1164 unregister: 1165 unregister_netdev(dev); 1166 free_vqs: 1167 vdev->config->del_vqs(vdev); 1168 free_stats: 1169 free_percpu(vi->stats); 1170 free: 1171 free_netdev(dev); 1172 return err; 1173 } 1174 1175 static void free_unused_bufs(struct virtnet_info *vi) 1176 { 1177 void *buf; 1178 while (1) { 1179 buf = virtqueue_detach_unused_buf(vi->svq); 1180 if (!buf) 1181 break; 1182 dev_kfree_skb(buf); 1183 } 1184 while (1) { 1185 buf = virtqueue_detach_unused_buf(vi->rvq); 1186 if (!buf) 1187 break; 1188 if (vi->mergeable_rx_bufs || vi->big_packets) 1189 give_pages(vi, buf); 1190 else 1191 dev_kfree_skb(buf); 1192 --vi->num; 1193 } 1194 BUG_ON(vi->num != 0); 1195 } 1196 1197 static void remove_vq_common(struct virtnet_info *vi) 1198 { 1199 vi->vdev->config->reset(vi->vdev); 1200 1201 /* Free unused buffers in both send and recv, if any. */ 1202 free_unused_bufs(vi); 1203 1204 vi->vdev->config->del_vqs(vi->vdev); 1205 1206 while (vi->pages) 1207 __free_pages(get_a_page(vi, GFP_KERNEL), 0); 1208 } 1209 1210 static void __devexit virtnet_remove(struct virtio_device *vdev) 1211 { 1212 struct virtnet_info *vi = vdev->priv; 1213 1214 /* Prevent config work handler from accessing the device. */ 1215 mutex_lock(&vi->config_lock); 1216 vi->config_enable = false; 1217 mutex_unlock(&vi->config_lock); 1218 1219 unregister_netdev(vi->dev); 1220 1221 remove_vq_common(vi); 1222 1223 flush_work(&vi->config_work); 1224 1225 free_percpu(vi->stats); 1226 free_netdev(vi->dev); 1227 } 1228 1229 #ifdef CONFIG_PM 1230 static int virtnet_freeze(struct virtio_device *vdev) 1231 { 1232 struct virtnet_info *vi = vdev->priv; 1233 1234 /* Prevent config work handler from accessing the device */ 1235 mutex_lock(&vi->config_lock); 1236 vi->config_enable = false; 1237 mutex_unlock(&vi->config_lock); 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