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, see <http://www.gnu.org/licenses/>. 17 */ 18 //#define DEBUG 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/ethtool.h> 22 #include <linux/module.h> 23 #include <linux/virtio.h> 24 #include <linux/virtio_net.h> 25 #include <linux/scatterlist.h> 26 #include <linux/if_vlan.h> 27 #include <linux/slab.h> 28 #include <linux/cpu.h> 29 #include <linux/average.h> 30 #include <net/busy_poll.h> 31 32 static int napi_weight = NAPI_POLL_WEIGHT; 33 module_param(napi_weight, int, 0444); 34 35 static bool csum = true, gso = true; 36 module_param(csum, bool, 0444); 37 module_param(gso, bool, 0444); 38 39 /* FIXME: MTU in config. */ 40 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) 41 #define GOOD_COPY_LEN 128 42 43 /* Weight used for the RX packet size EWMA. The average packet size is used to 44 * determine the packet buffer size when refilling RX rings. As the entire RX 45 * ring may be refilled at once, the weight is chosen so that the EWMA will be 46 * insensitive to short-term, transient changes in packet size. 47 */ 48 #define RECEIVE_AVG_WEIGHT 64 49 50 /* Minimum alignment for mergeable packet buffers. */ 51 #define MERGEABLE_BUFFER_ALIGN max(L1_CACHE_BYTES, 256) 52 53 #define VIRTNET_DRIVER_VERSION "1.0.0" 54 55 struct virtnet_stats { 56 struct u64_stats_sync tx_syncp; 57 struct u64_stats_sync rx_syncp; 58 u64 tx_bytes; 59 u64 tx_packets; 60 61 u64 rx_bytes; 62 u64 rx_packets; 63 }; 64 65 /* Internal representation of a send virtqueue */ 66 struct send_queue { 67 /* Virtqueue associated with this send _queue */ 68 struct virtqueue *vq; 69 70 /* TX: fragments + linear part + virtio header */ 71 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 72 73 /* Name of the send queue: output.$index */ 74 char name[40]; 75 }; 76 77 /* Internal representation of a receive virtqueue */ 78 struct receive_queue { 79 /* Virtqueue associated with this receive_queue */ 80 struct virtqueue *vq; 81 82 struct napi_struct napi; 83 84 /* Chain pages by the private ptr. */ 85 struct page *pages; 86 87 /* Average packet length for mergeable receive buffers. */ 88 struct ewma mrg_avg_pkt_len; 89 90 /* Page frag for packet buffer allocation. */ 91 struct page_frag alloc_frag; 92 93 /* RX: fragments + linear part + virtio header */ 94 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 95 96 /* Name of this receive queue: input.$index */ 97 char name[40]; 98 }; 99 100 struct virtnet_info { 101 struct virtio_device *vdev; 102 struct virtqueue *cvq; 103 struct net_device *dev; 104 struct send_queue *sq; 105 struct receive_queue *rq; 106 unsigned int status; 107 108 /* Max # of queue pairs supported by the device */ 109 u16 max_queue_pairs; 110 111 /* # of queue pairs currently used by the driver */ 112 u16 curr_queue_pairs; 113 114 /* I like... big packets and I cannot lie! */ 115 bool big_packets; 116 117 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 118 bool mergeable_rx_bufs; 119 120 /* Has control virtqueue */ 121 bool has_cvq; 122 123 /* Host can handle any s/g split between our header and packet data */ 124 bool any_header_sg; 125 126 /* enable config space updates */ 127 bool config_enable; 128 129 /* Active statistics */ 130 struct virtnet_stats __percpu *stats; 131 132 /* Work struct for refilling if we run low on memory. */ 133 struct delayed_work refill; 134 135 /* Work struct for config space updates */ 136 struct work_struct config_work; 137 138 /* Lock for config space updates */ 139 struct mutex config_lock; 140 141 /* Does the affinity hint is set for virtqueues? */ 142 bool affinity_hint_set; 143 144 /* CPU hot plug notifier */ 145 struct notifier_block nb; 146 }; 147 148 struct skb_vnet_hdr { 149 union { 150 struct virtio_net_hdr hdr; 151 struct virtio_net_hdr_mrg_rxbuf mhdr; 152 }; 153 }; 154 155 struct padded_vnet_hdr { 156 struct virtio_net_hdr hdr; 157 /* 158 * virtio_net_hdr should be in a separated sg buffer because of a 159 * QEMU bug, and data sg buffer shares same page with this header sg. 160 * This padding makes next sg 16 byte aligned after virtio_net_hdr. 161 */ 162 char padding[6]; 163 }; 164 165 /* Converting between virtqueue no. and kernel tx/rx queue no. 166 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 167 */ 168 static int vq2txq(struct virtqueue *vq) 169 { 170 return (vq->index - 1) / 2; 171 } 172 173 static int txq2vq(int txq) 174 { 175 return txq * 2 + 1; 176 } 177 178 static int vq2rxq(struct virtqueue *vq) 179 { 180 return vq->index / 2; 181 } 182 183 static int rxq2vq(int rxq) 184 { 185 return rxq * 2; 186 } 187 188 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) 189 { 190 return (struct skb_vnet_hdr *)skb->cb; 191 } 192 193 /* 194 * private is used to chain pages for big packets, put the whole 195 * most recent used list in the beginning for reuse 196 */ 197 static void give_pages(struct receive_queue *rq, struct page *page) 198 { 199 struct page *end; 200 201 /* Find end of list, sew whole thing into vi->rq.pages. */ 202 for (end = page; end->private; end = (struct page *)end->private); 203 end->private = (unsigned long)rq->pages; 204 rq->pages = page; 205 } 206 207 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 208 { 209 struct page *p = rq->pages; 210 211 if (p) { 212 rq->pages = (struct page *)p->private; 213 /* clear private here, it is used to chain pages */ 214 p->private = 0; 215 } else 216 p = alloc_page(gfp_mask); 217 return p; 218 } 219 220 static void skb_xmit_done(struct virtqueue *vq) 221 { 222 struct virtnet_info *vi = vq->vdev->priv; 223 224 /* Suppress further interrupts. */ 225 virtqueue_disable_cb(vq); 226 227 /* We were probably waiting for more output buffers. */ 228 netif_wake_subqueue(vi->dev, vq2txq(vq)); 229 } 230 231 static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) 232 { 233 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); 234 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; 235 } 236 237 static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) 238 { 239 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); 240 241 } 242 243 static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) 244 { 245 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; 246 return (unsigned long)buf | (size - 1); 247 } 248 249 /* Called from bottom half context */ 250 static struct sk_buff *page_to_skb(struct receive_queue *rq, 251 struct page *page, unsigned int offset, 252 unsigned int len, unsigned int truesize) 253 { 254 struct virtnet_info *vi = rq->vq->vdev->priv; 255 struct sk_buff *skb; 256 struct skb_vnet_hdr *hdr; 257 unsigned int copy, hdr_len, hdr_padded_len; 258 char *p; 259 260 p = page_address(page) + offset; 261 262 /* copy small packet so we can reuse these pages for small data */ 263 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); 264 if (unlikely(!skb)) 265 return NULL; 266 267 hdr = skb_vnet_hdr(skb); 268 269 if (vi->mergeable_rx_bufs) { 270 hdr_len = sizeof hdr->mhdr; 271 hdr_padded_len = sizeof hdr->mhdr; 272 } else { 273 hdr_len = sizeof hdr->hdr; 274 hdr_padded_len = sizeof(struct padded_vnet_hdr); 275 } 276 277 memcpy(hdr, p, hdr_len); 278 279 len -= hdr_len; 280 offset += hdr_padded_len; 281 p += hdr_padded_len; 282 283 copy = len; 284 if (copy > skb_tailroom(skb)) 285 copy = skb_tailroom(skb); 286 memcpy(skb_put(skb, copy), p, copy); 287 288 len -= copy; 289 offset += copy; 290 291 if (vi->mergeable_rx_bufs) { 292 if (len) 293 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 294 else 295 put_page(page); 296 return skb; 297 } 298 299 /* 300 * Verify that we can indeed put this data into a skb. 301 * This is here to handle cases when the device erroneously 302 * tries to receive more than is possible. This is usually 303 * the case of a broken device. 304 */ 305 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 306 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 307 dev_kfree_skb(skb); 308 return NULL; 309 } 310 BUG_ON(offset >= PAGE_SIZE); 311 while (len) { 312 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 313 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 314 frag_size, truesize); 315 len -= frag_size; 316 page = (struct page *)page->private; 317 offset = 0; 318 } 319 320 if (page) 321 give_pages(rq, page); 322 323 return skb; 324 } 325 326 static struct sk_buff *receive_small(void *buf, unsigned int len) 327 { 328 struct sk_buff * skb = buf; 329 330 len -= sizeof(struct virtio_net_hdr); 331 skb_trim(skb, len); 332 333 return skb; 334 } 335 336 static struct sk_buff *receive_big(struct net_device *dev, 337 struct receive_queue *rq, 338 void *buf, 339 unsigned int len) 340 { 341 struct page *page = buf; 342 struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE); 343 344 if (unlikely(!skb)) 345 goto err; 346 347 return skb; 348 349 err: 350 dev->stats.rx_dropped++; 351 give_pages(rq, page); 352 return NULL; 353 } 354 355 static struct sk_buff *receive_mergeable(struct net_device *dev, 356 struct receive_queue *rq, 357 unsigned long ctx, 358 unsigned int len) 359 { 360 void *buf = mergeable_ctx_to_buf_address(ctx); 361 struct skb_vnet_hdr *hdr = buf; 362 int num_buf = hdr->mhdr.num_buffers; 363 struct page *page = virt_to_head_page(buf); 364 int offset = buf - page_address(page); 365 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 366 367 struct sk_buff *head_skb = page_to_skb(rq, page, offset, len, truesize); 368 struct sk_buff *curr_skb = head_skb; 369 370 if (unlikely(!curr_skb)) 371 goto err_skb; 372 while (--num_buf) { 373 int num_skb_frags; 374 375 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 376 if (unlikely(!ctx)) { 377 pr_debug("%s: rx error: %d buffers out of %d missing\n", 378 dev->name, num_buf, hdr->mhdr.num_buffers); 379 dev->stats.rx_length_errors++; 380 goto err_buf; 381 } 382 383 buf = mergeable_ctx_to_buf_address(ctx); 384 page = virt_to_head_page(buf); 385 386 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 387 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 388 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 389 390 if (unlikely(!nskb)) 391 goto err_skb; 392 if (curr_skb == head_skb) 393 skb_shinfo(curr_skb)->frag_list = nskb; 394 else 395 curr_skb->next = nskb; 396 curr_skb = nskb; 397 head_skb->truesize += nskb->truesize; 398 num_skb_frags = 0; 399 } 400 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 401 if (curr_skb != head_skb) { 402 head_skb->data_len += len; 403 head_skb->len += len; 404 head_skb->truesize += truesize; 405 } 406 offset = buf - page_address(page); 407 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 408 put_page(page); 409 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 410 len, truesize); 411 } else { 412 skb_add_rx_frag(curr_skb, num_skb_frags, page, 413 offset, len, truesize); 414 } 415 } 416 417 ewma_add(&rq->mrg_avg_pkt_len, head_skb->len); 418 return head_skb; 419 420 err_skb: 421 put_page(page); 422 while (--num_buf) { 423 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 424 if (unlikely(!ctx)) { 425 pr_debug("%s: rx error: %d buffers missing\n", 426 dev->name, num_buf); 427 dev->stats.rx_length_errors++; 428 break; 429 } 430 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); 431 put_page(page); 432 } 433 err_buf: 434 dev->stats.rx_dropped++; 435 dev_kfree_skb(head_skb); 436 return NULL; 437 } 438 439 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) 440 { 441 struct virtnet_info *vi = rq->vq->vdev->priv; 442 struct net_device *dev = vi->dev; 443 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 444 struct sk_buff *skb; 445 struct skb_vnet_hdr *hdr; 446 447 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { 448 pr_debug("%s: short packet %i\n", dev->name, len); 449 dev->stats.rx_length_errors++; 450 if (vi->mergeable_rx_bufs) { 451 unsigned long ctx = (unsigned long)buf; 452 void *base = mergeable_ctx_to_buf_address(ctx); 453 put_page(virt_to_head_page(base)); 454 } else if (vi->big_packets) { 455 give_pages(rq, buf); 456 } else { 457 dev_kfree_skb(buf); 458 } 459 return; 460 } 461 462 if (vi->mergeable_rx_bufs) 463 skb = receive_mergeable(dev, rq, (unsigned long)buf, len); 464 else if (vi->big_packets) 465 skb = receive_big(dev, rq, buf, len); 466 else 467 skb = receive_small(buf, len); 468 469 if (unlikely(!skb)) 470 return; 471 472 hdr = skb_vnet_hdr(skb); 473 474 u64_stats_update_begin(&stats->rx_syncp); 475 stats->rx_bytes += skb->len; 476 stats->rx_packets++; 477 u64_stats_update_end(&stats->rx_syncp); 478 479 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 480 pr_debug("Needs csum!\n"); 481 if (!skb_partial_csum_set(skb, 482 hdr->hdr.csum_start, 483 hdr->hdr.csum_offset)) 484 goto frame_err; 485 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { 486 skb->ip_summed = CHECKSUM_UNNECESSARY; 487 } 488 489 skb->protocol = eth_type_trans(skb, dev); 490 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 491 ntohs(skb->protocol), skb->len, skb->pkt_type); 492 493 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { 494 pr_debug("GSO!\n"); 495 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 496 case VIRTIO_NET_HDR_GSO_TCPV4: 497 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 498 break; 499 case VIRTIO_NET_HDR_GSO_UDP: 500 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 501 break; 502 case VIRTIO_NET_HDR_GSO_TCPV6: 503 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 504 break; 505 default: 506 net_warn_ratelimited("%s: bad gso type %u.\n", 507 dev->name, hdr->hdr.gso_type); 508 goto frame_err; 509 } 510 511 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 512 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 513 514 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; 515 if (skb_shinfo(skb)->gso_size == 0) { 516 net_warn_ratelimited("%s: zero gso size.\n", dev->name); 517 goto frame_err; 518 } 519 520 /* Header must be checked, and gso_segs computed. */ 521 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 522 skb_shinfo(skb)->gso_segs = 0; 523 } 524 525 skb_mark_napi_id(skb, &rq->napi); 526 527 netif_receive_skb(skb); 528 return; 529 530 frame_err: 531 dev->stats.rx_frame_errors++; 532 dev_kfree_skb(skb); 533 } 534 535 static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) 536 { 537 struct virtnet_info *vi = rq->vq->vdev->priv; 538 struct sk_buff *skb; 539 struct skb_vnet_hdr *hdr; 540 int err; 541 542 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); 543 if (unlikely(!skb)) 544 return -ENOMEM; 545 546 skb_put(skb, GOOD_PACKET_LEN); 547 548 hdr = skb_vnet_hdr(skb); 549 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); 550 551 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); 552 553 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); 554 if (err < 0) 555 dev_kfree_skb(skb); 556 557 return err; 558 } 559 560 static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) 561 { 562 struct page *first, *list = NULL; 563 char *p; 564 int i, err, offset; 565 566 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 567 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 568 first = get_a_page(rq, gfp); 569 if (!first) { 570 if (list) 571 give_pages(rq, list); 572 return -ENOMEM; 573 } 574 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 575 576 /* chain new page in list head to match sg */ 577 first->private = (unsigned long)list; 578 list = first; 579 } 580 581 first = get_a_page(rq, gfp); 582 if (!first) { 583 give_pages(rq, list); 584 return -ENOMEM; 585 } 586 p = page_address(first); 587 588 /* rq->sg[0], rq->sg[1] share the same page */ 589 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ 590 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); 591 592 /* rq->sg[1] for data packet, from offset */ 593 offset = sizeof(struct padded_vnet_hdr); 594 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 595 596 /* chain first in list head */ 597 first->private = (unsigned long)list; 598 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 599 first, gfp); 600 if (err < 0) 601 give_pages(rq, first); 602 603 return err; 604 } 605 606 static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) 607 { 608 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 609 unsigned int len; 610 611 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), 612 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); 613 return ALIGN(len, MERGEABLE_BUFFER_ALIGN); 614 } 615 616 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) 617 { 618 struct page_frag *alloc_frag = &rq->alloc_frag; 619 char *buf; 620 unsigned long ctx; 621 int err; 622 unsigned int len, hole; 623 624 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); 625 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 626 return -ENOMEM; 627 628 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 629 ctx = mergeable_buf_to_ctx(buf, len); 630 get_page(alloc_frag->page); 631 alloc_frag->offset += len; 632 hole = alloc_frag->size - alloc_frag->offset; 633 if (hole < len) { 634 /* To avoid internal fragmentation, if there is very likely not 635 * enough space for another buffer, add the remaining space to 636 * the current buffer. This extra space is not included in 637 * the truesize stored in ctx. 638 */ 639 len += hole; 640 alloc_frag->offset += hole; 641 } 642 643 sg_init_one(rq->sg, buf, len); 644 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); 645 if (err < 0) 646 put_page(virt_to_head_page(buf)); 647 648 return err; 649 } 650 651 /* 652 * Returns false if we couldn't fill entirely (OOM). 653 * 654 * Normally run in the receive path, but can also be run from ndo_open 655 * before we're receiving packets, or from refill_work which is 656 * careful to disable receiving (using napi_disable). 657 */ 658 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) 659 { 660 struct virtnet_info *vi = rq->vq->vdev->priv; 661 int err; 662 bool oom; 663 664 gfp |= __GFP_COLD; 665 do { 666 if (vi->mergeable_rx_bufs) 667 err = add_recvbuf_mergeable(rq, gfp); 668 else if (vi->big_packets) 669 err = add_recvbuf_big(rq, gfp); 670 else 671 err = add_recvbuf_small(rq, gfp); 672 673 oom = err == -ENOMEM; 674 if (err) 675 break; 676 } while (rq->vq->num_free); 677 virtqueue_kick(rq->vq); 678 return !oom; 679 } 680 681 static void skb_recv_done(struct virtqueue *rvq) 682 { 683 struct virtnet_info *vi = rvq->vdev->priv; 684 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 685 686 /* Schedule NAPI, Suppress further interrupts if successful. */ 687 if (napi_schedule_prep(&rq->napi)) { 688 virtqueue_disable_cb(rvq); 689 __napi_schedule(&rq->napi); 690 } 691 } 692 693 static void virtnet_napi_enable(struct receive_queue *rq) 694 { 695 napi_enable(&rq->napi); 696 697 /* If all buffers were filled by other side before we napi_enabled, we 698 * won't get another interrupt, so process any outstanding packets 699 * now. virtnet_poll wants re-enable the queue, so we disable here. 700 * We synchronize against interrupts via NAPI_STATE_SCHED */ 701 if (napi_schedule_prep(&rq->napi)) { 702 virtqueue_disable_cb(rq->vq); 703 local_bh_disable(); 704 __napi_schedule(&rq->napi); 705 local_bh_enable(); 706 } 707 } 708 709 static void refill_work(struct work_struct *work) 710 { 711 struct virtnet_info *vi = 712 container_of(work, struct virtnet_info, refill.work); 713 bool still_empty; 714 int i; 715 716 for (i = 0; i < vi->curr_queue_pairs; i++) { 717 struct receive_queue *rq = &vi->rq[i]; 718 719 napi_disable(&rq->napi); 720 still_empty = !try_fill_recv(rq, GFP_KERNEL); 721 virtnet_napi_enable(rq); 722 723 /* In theory, this can happen: if we don't get any buffers in 724 * we will *never* try to fill again. 725 */ 726 if (still_empty) 727 schedule_delayed_work(&vi->refill, HZ/2); 728 } 729 } 730 731 static int virtnet_receive(struct receive_queue *rq, int budget) 732 { 733 struct virtnet_info *vi = rq->vq->vdev->priv; 734 unsigned int len, received = 0; 735 void *buf; 736 737 while (received < budget && 738 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 739 receive_buf(rq, buf, len); 740 received++; 741 } 742 743 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 744 if (!try_fill_recv(rq, GFP_ATOMIC)) 745 schedule_delayed_work(&vi->refill, 0); 746 } 747 748 return received; 749 } 750 751 static int virtnet_poll(struct napi_struct *napi, int budget) 752 { 753 struct receive_queue *rq = 754 container_of(napi, struct receive_queue, napi); 755 unsigned int r, received = 0; 756 757 again: 758 received += virtnet_receive(rq, budget - received); 759 760 /* Out of packets? */ 761 if (received < budget) { 762 r = virtqueue_enable_cb_prepare(rq->vq); 763 napi_complete(napi); 764 if (unlikely(virtqueue_poll(rq->vq, r)) && 765 napi_schedule_prep(napi)) { 766 virtqueue_disable_cb(rq->vq); 767 __napi_schedule(napi); 768 goto again; 769 } 770 } 771 772 return received; 773 } 774 775 #ifdef CONFIG_NET_RX_BUSY_POLL 776 /* must be called with local_bh_disable()d */ 777 static int virtnet_busy_poll(struct napi_struct *napi) 778 { 779 struct receive_queue *rq = 780 container_of(napi, struct receive_queue, napi); 781 struct virtnet_info *vi = rq->vq->vdev->priv; 782 int r, received = 0, budget = 4; 783 784 if (!(vi->status & VIRTIO_NET_S_LINK_UP)) 785 return LL_FLUSH_FAILED; 786 787 if (!napi_schedule_prep(napi)) 788 return LL_FLUSH_BUSY; 789 790 virtqueue_disable_cb(rq->vq); 791 792 again: 793 received += virtnet_receive(rq, budget); 794 795 r = virtqueue_enable_cb_prepare(rq->vq); 796 clear_bit(NAPI_STATE_SCHED, &napi->state); 797 if (unlikely(virtqueue_poll(rq->vq, r)) && 798 napi_schedule_prep(napi)) { 799 virtqueue_disable_cb(rq->vq); 800 if (received < budget) { 801 budget -= received; 802 goto again; 803 } else { 804 __napi_schedule(napi); 805 } 806 } 807 808 return received; 809 } 810 #endif /* CONFIG_NET_RX_BUSY_POLL */ 811 812 static int virtnet_open(struct net_device *dev) 813 { 814 struct virtnet_info *vi = netdev_priv(dev); 815 int i; 816 817 for (i = 0; i < vi->max_queue_pairs; i++) { 818 if (i < vi->curr_queue_pairs) 819 /* Make sure we have some buffers: if oom use wq. */ 820 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) 821 schedule_delayed_work(&vi->refill, 0); 822 virtnet_napi_enable(&vi->rq[i]); 823 } 824 825 return 0; 826 } 827 828 static void free_old_xmit_skbs(struct send_queue *sq) 829 { 830 struct sk_buff *skb; 831 unsigned int len; 832 struct virtnet_info *vi = sq->vq->vdev->priv; 833 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 834 835 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 836 pr_debug("Sent skb %p\n", skb); 837 838 u64_stats_update_begin(&stats->tx_syncp); 839 stats->tx_bytes += skb->len; 840 stats->tx_packets++; 841 u64_stats_update_end(&stats->tx_syncp); 842 843 dev_kfree_skb_any(skb); 844 } 845 } 846 847 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 848 { 849 struct skb_vnet_hdr *hdr; 850 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 851 struct virtnet_info *vi = sq->vq->vdev->priv; 852 unsigned num_sg; 853 unsigned hdr_len; 854 bool can_push; 855 856 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 857 if (vi->mergeable_rx_bufs) 858 hdr_len = sizeof hdr->mhdr; 859 else 860 hdr_len = sizeof hdr->hdr; 861 862 can_push = vi->any_header_sg && 863 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 864 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 865 /* Even if we can, don't push here yet as this would skew 866 * csum_start offset below. */ 867 if (can_push) 868 hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len); 869 else 870 hdr = skb_vnet_hdr(skb); 871 872 if (skb->ip_summed == CHECKSUM_PARTIAL) { 873 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 874 hdr->hdr.csum_start = skb_checksum_start_offset(skb); 875 hdr->hdr.csum_offset = skb->csum_offset; 876 } else { 877 hdr->hdr.flags = 0; 878 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 879 } 880 881 if (skb_is_gso(skb)) { 882 hdr->hdr.hdr_len = skb_headlen(skb); 883 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; 884 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 885 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 886 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 887 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 888 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 889 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; 890 else 891 BUG(); 892 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 893 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 894 } else { 895 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 896 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 897 } 898 899 if (vi->mergeable_rx_bufs) 900 hdr->mhdr.num_buffers = 0; 901 902 if (can_push) { 903 __skb_push(skb, hdr_len); 904 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 905 /* Pull header back to avoid skew in tx bytes calculations. */ 906 __skb_pull(skb, hdr_len); 907 } else { 908 sg_set_buf(sq->sg, hdr, hdr_len); 909 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; 910 } 911 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 912 } 913 914 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 915 { 916 struct virtnet_info *vi = netdev_priv(dev); 917 int qnum = skb_get_queue_mapping(skb); 918 struct send_queue *sq = &vi->sq[qnum]; 919 int err; 920 921 /* Free up any pending old buffers before queueing new ones. */ 922 free_old_xmit_skbs(sq); 923 924 /* Try to transmit */ 925 err = xmit_skb(sq, skb); 926 927 /* This should not happen! */ 928 if (unlikely(err)) { 929 dev->stats.tx_fifo_errors++; 930 if (net_ratelimit()) 931 dev_warn(&dev->dev, 932 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 933 dev->stats.tx_dropped++; 934 dev_kfree_skb_any(skb); 935 return NETDEV_TX_OK; 936 } 937 virtqueue_kick(sq->vq); 938 939 /* Don't wait up for transmitted skbs to be freed. */ 940 skb_orphan(skb); 941 nf_reset(skb); 942 943 /* Apparently nice girls don't return TX_BUSY; stop the queue 944 * before it gets out of hand. Naturally, this wastes entries. */ 945 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 946 netif_stop_subqueue(dev, qnum); 947 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 948 /* More just got used, free them then recheck. */ 949 free_old_xmit_skbs(sq); 950 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 951 netif_start_subqueue(dev, qnum); 952 virtqueue_disable_cb(sq->vq); 953 } 954 } 955 } 956 957 return NETDEV_TX_OK; 958 } 959 960 /* 961 * Send command via the control virtqueue and check status. Commands 962 * supported by the hypervisor, as indicated by feature bits, should 963 * never fail unless improperly formatted. 964 */ 965 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 966 struct scatterlist *out) 967 { 968 struct scatterlist *sgs[4], hdr, stat; 969 struct virtio_net_ctrl_hdr ctrl; 970 virtio_net_ctrl_ack status = ~0; 971 unsigned out_num = 0, tmp; 972 973 /* Caller should know better */ 974 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 975 976 ctrl.class = class; 977 ctrl.cmd = cmd; 978 /* Add header */ 979 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 980 sgs[out_num++] = &hdr; 981 982 if (out) 983 sgs[out_num++] = out; 984 985 /* Add return status. */ 986 sg_init_one(&stat, &status, sizeof(status)); 987 sgs[out_num] = &stat; 988 989 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 990 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 991 992 if (unlikely(!virtqueue_kick(vi->cvq))) 993 return status == VIRTIO_NET_OK; 994 995 /* Spin for a response, the kick causes an ioport write, trapping 996 * into the hypervisor, so the request should be handled immediately. 997 */ 998 while (!virtqueue_get_buf(vi->cvq, &tmp) && 999 !virtqueue_is_broken(vi->cvq)) 1000 cpu_relax(); 1001 1002 return status == VIRTIO_NET_OK; 1003 } 1004 1005 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1006 { 1007 struct virtnet_info *vi = netdev_priv(dev); 1008 struct virtio_device *vdev = vi->vdev; 1009 int ret; 1010 struct sockaddr *addr = p; 1011 struct scatterlist sg; 1012 1013 ret = eth_prepare_mac_addr_change(dev, p); 1014 if (ret) 1015 return ret; 1016 1017 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1018 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1019 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1020 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1021 dev_warn(&vdev->dev, 1022 "Failed to set mac address by vq command.\n"); 1023 return -EINVAL; 1024 } 1025 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 1026 unsigned int i; 1027 1028 /* Naturally, this has an atomicity problem. */ 1029 for (i = 0; i < dev->addr_len; i++) 1030 virtio_cwrite8(vdev, 1031 offsetof(struct virtio_net_config, mac) + 1032 i, addr->sa_data[i]); 1033 } 1034 1035 eth_commit_mac_addr_change(dev, p); 1036 1037 return 0; 1038 } 1039 1040 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1041 struct rtnl_link_stats64 *tot) 1042 { 1043 struct virtnet_info *vi = netdev_priv(dev); 1044 int cpu; 1045 unsigned int start; 1046 1047 for_each_possible_cpu(cpu) { 1048 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1049 u64 tpackets, tbytes, rpackets, rbytes; 1050 1051 do { 1052 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1053 tpackets = stats->tx_packets; 1054 tbytes = stats->tx_bytes; 1055 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1056 1057 do { 1058 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1059 rpackets = stats->rx_packets; 1060 rbytes = stats->rx_bytes; 1061 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1062 1063 tot->rx_packets += rpackets; 1064 tot->tx_packets += tpackets; 1065 tot->rx_bytes += rbytes; 1066 tot->tx_bytes += tbytes; 1067 } 1068 1069 tot->tx_dropped = dev->stats.tx_dropped; 1070 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1071 tot->rx_dropped = dev->stats.rx_dropped; 1072 tot->rx_length_errors = dev->stats.rx_length_errors; 1073 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1074 1075 return tot; 1076 } 1077 1078 #ifdef CONFIG_NET_POLL_CONTROLLER 1079 static void virtnet_netpoll(struct net_device *dev) 1080 { 1081 struct virtnet_info *vi = netdev_priv(dev); 1082 int i; 1083 1084 for (i = 0; i < vi->curr_queue_pairs; i++) 1085 napi_schedule(&vi->rq[i].napi); 1086 } 1087 #endif 1088 1089 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1090 { 1091 rtnl_lock(); 1092 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1093 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1094 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1095 rtnl_unlock(); 1096 } 1097 1098 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1099 { 1100 struct scatterlist sg; 1101 struct virtio_net_ctrl_mq s; 1102 struct net_device *dev = vi->dev; 1103 1104 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1105 return 0; 1106 1107 s.virtqueue_pairs = queue_pairs; 1108 sg_init_one(&sg, &s, sizeof(s)); 1109 1110 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1111 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1112 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1113 queue_pairs); 1114 return -EINVAL; 1115 } else { 1116 vi->curr_queue_pairs = queue_pairs; 1117 /* virtnet_open() will refill when device is going to up. */ 1118 if (dev->flags & IFF_UP) 1119 schedule_delayed_work(&vi->refill, 0); 1120 } 1121 1122 return 0; 1123 } 1124 1125 static int virtnet_close(struct net_device *dev) 1126 { 1127 struct virtnet_info *vi = netdev_priv(dev); 1128 int i; 1129 1130 /* Make sure refill_work doesn't re-enable napi! */ 1131 cancel_delayed_work_sync(&vi->refill); 1132 1133 for (i = 0; i < vi->max_queue_pairs; i++) 1134 napi_disable(&vi->rq[i].napi); 1135 1136 return 0; 1137 } 1138 1139 static void virtnet_set_rx_mode(struct net_device *dev) 1140 { 1141 struct virtnet_info *vi = netdev_priv(dev); 1142 struct scatterlist sg[2]; 1143 u8 promisc, allmulti; 1144 struct virtio_net_ctrl_mac *mac_data; 1145 struct netdev_hw_addr *ha; 1146 int uc_count; 1147 int mc_count; 1148 void *buf; 1149 int i; 1150 1151 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1152 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1153 return; 1154 1155 promisc = ((dev->flags & IFF_PROMISC) != 0); 1156 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1157 1158 sg_init_one(sg, &promisc, sizeof(promisc)); 1159 1160 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1161 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1162 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1163 promisc ? "en" : "dis"); 1164 1165 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1166 1167 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1168 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1169 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1170 allmulti ? "en" : "dis"); 1171 1172 uc_count = netdev_uc_count(dev); 1173 mc_count = netdev_mc_count(dev); 1174 /* MAC filter - use one buffer for both lists */ 1175 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1176 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1177 mac_data = buf; 1178 if (!buf) 1179 return; 1180 1181 sg_init_table(sg, 2); 1182 1183 /* Store the unicast list and count in the front of the buffer */ 1184 mac_data->entries = uc_count; 1185 i = 0; 1186 netdev_for_each_uc_addr(ha, dev) 1187 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1188 1189 sg_set_buf(&sg[0], mac_data, 1190 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1191 1192 /* multicast list and count fill the end */ 1193 mac_data = (void *)&mac_data->macs[uc_count][0]; 1194 1195 mac_data->entries = mc_count; 1196 i = 0; 1197 netdev_for_each_mc_addr(ha, dev) 1198 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1199 1200 sg_set_buf(&sg[1], mac_data, 1201 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1202 1203 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1204 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1205 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1206 1207 kfree(buf); 1208 } 1209 1210 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1211 __be16 proto, u16 vid) 1212 { 1213 struct virtnet_info *vi = netdev_priv(dev); 1214 struct scatterlist sg; 1215 1216 sg_init_one(&sg, &vid, sizeof(vid)); 1217 1218 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1219 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1220 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1221 return 0; 1222 } 1223 1224 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1225 __be16 proto, u16 vid) 1226 { 1227 struct virtnet_info *vi = netdev_priv(dev); 1228 struct scatterlist sg; 1229 1230 sg_init_one(&sg, &vid, sizeof(vid)); 1231 1232 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1233 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1234 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1235 return 0; 1236 } 1237 1238 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1239 { 1240 int i; 1241 1242 if (vi->affinity_hint_set) { 1243 for (i = 0; i < vi->max_queue_pairs; i++) { 1244 virtqueue_set_affinity(vi->rq[i].vq, -1); 1245 virtqueue_set_affinity(vi->sq[i].vq, -1); 1246 } 1247 1248 vi->affinity_hint_set = false; 1249 } 1250 } 1251 1252 static void virtnet_set_affinity(struct virtnet_info *vi) 1253 { 1254 int i; 1255 int cpu; 1256 1257 /* In multiqueue mode, when the number of cpu is equal to the number of 1258 * queue pairs, we let the queue pairs to be private to one cpu by 1259 * setting the affinity hint to eliminate the contention. 1260 */ 1261 if (vi->curr_queue_pairs == 1 || 1262 vi->max_queue_pairs != num_online_cpus()) { 1263 virtnet_clean_affinity(vi, -1); 1264 return; 1265 } 1266 1267 i = 0; 1268 for_each_online_cpu(cpu) { 1269 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1270 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1271 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1272 i++; 1273 } 1274 1275 vi->affinity_hint_set = true; 1276 } 1277 1278 static int virtnet_cpu_callback(struct notifier_block *nfb, 1279 unsigned long action, void *hcpu) 1280 { 1281 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1282 1283 switch(action & ~CPU_TASKS_FROZEN) { 1284 case CPU_ONLINE: 1285 case CPU_DOWN_FAILED: 1286 case CPU_DEAD: 1287 virtnet_set_affinity(vi); 1288 break; 1289 case CPU_DOWN_PREPARE: 1290 virtnet_clean_affinity(vi, (long)hcpu); 1291 break; 1292 default: 1293 break; 1294 } 1295 1296 return NOTIFY_OK; 1297 } 1298 1299 static void virtnet_get_ringparam(struct net_device *dev, 1300 struct ethtool_ringparam *ring) 1301 { 1302 struct virtnet_info *vi = netdev_priv(dev); 1303 1304 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1305 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1306 ring->rx_pending = ring->rx_max_pending; 1307 ring->tx_pending = ring->tx_max_pending; 1308 } 1309 1310 1311 static void virtnet_get_drvinfo(struct net_device *dev, 1312 struct ethtool_drvinfo *info) 1313 { 1314 struct virtnet_info *vi = netdev_priv(dev); 1315 struct virtio_device *vdev = vi->vdev; 1316 1317 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1318 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1319 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1320 1321 } 1322 1323 /* TODO: Eliminate OOO packets during switching */ 1324 static int virtnet_set_channels(struct net_device *dev, 1325 struct ethtool_channels *channels) 1326 { 1327 struct virtnet_info *vi = netdev_priv(dev); 1328 u16 queue_pairs = channels->combined_count; 1329 int err; 1330 1331 /* We don't support separate rx/tx channels. 1332 * We don't allow setting 'other' channels. 1333 */ 1334 if (channels->rx_count || channels->tx_count || channels->other_count) 1335 return -EINVAL; 1336 1337 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1338 return -EINVAL; 1339 1340 get_online_cpus(); 1341 err = virtnet_set_queues(vi, queue_pairs); 1342 if (!err) { 1343 netif_set_real_num_tx_queues(dev, queue_pairs); 1344 netif_set_real_num_rx_queues(dev, queue_pairs); 1345 1346 virtnet_set_affinity(vi); 1347 } 1348 put_online_cpus(); 1349 1350 return err; 1351 } 1352 1353 static void virtnet_get_channels(struct net_device *dev, 1354 struct ethtool_channels *channels) 1355 { 1356 struct virtnet_info *vi = netdev_priv(dev); 1357 1358 channels->combined_count = vi->curr_queue_pairs; 1359 channels->max_combined = vi->max_queue_pairs; 1360 channels->max_other = 0; 1361 channels->rx_count = 0; 1362 channels->tx_count = 0; 1363 channels->other_count = 0; 1364 } 1365 1366 static const struct ethtool_ops virtnet_ethtool_ops = { 1367 .get_drvinfo = virtnet_get_drvinfo, 1368 .get_link = ethtool_op_get_link, 1369 .get_ringparam = virtnet_get_ringparam, 1370 .set_channels = virtnet_set_channels, 1371 .get_channels = virtnet_get_channels, 1372 }; 1373 1374 #define MIN_MTU 68 1375 #define MAX_MTU 65535 1376 1377 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1378 { 1379 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1380 return -EINVAL; 1381 dev->mtu = new_mtu; 1382 return 0; 1383 } 1384 1385 static const struct net_device_ops virtnet_netdev = { 1386 .ndo_open = virtnet_open, 1387 .ndo_stop = virtnet_close, 1388 .ndo_start_xmit = start_xmit, 1389 .ndo_validate_addr = eth_validate_addr, 1390 .ndo_set_mac_address = virtnet_set_mac_address, 1391 .ndo_set_rx_mode = virtnet_set_rx_mode, 1392 .ndo_change_mtu = virtnet_change_mtu, 1393 .ndo_get_stats64 = virtnet_stats, 1394 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1395 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1396 #ifdef CONFIG_NET_POLL_CONTROLLER 1397 .ndo_poll_controller = virtnet_netpoll, 1398 #endif 1399 #ifdef CONFIG_NET_RX_BUSY_POLL 1400 .ndo_busy_poll = virtnet_busy_poll, 1401 #endif 1402 }; 1403 1404 static void virtnet_config_changed_work(struct work_struct *work) 1405 { 1406 struct virtnet_info *vi = 1407 container_of(work, struct virtnet_info, config_work); 1408 u16 v; 1409 1410 mutex_lock(&vi->config_lock); 1411 if (!vi->config_enable) 1412 goto done; 1413 1414 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1415 struct virtio_net_config, status, &v) < 0) 1416 goto done; 1417 1418 if (v & VIRTIO_NET_S_ANNOUNCE) { 1419 netdev_notify_peers(vi->dev); 1420 virtnet_ack_link_announce(vi); 1421 } 1422 1423 /* Ignore unknown (future) status bits */ 1424 v &= VIRTIO_NET_S_LINK_UP; 1425 1426 if (vi->status == v) 1427 goto done; 1428 1429 vi->status = v; 1430 1431 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1432 netif_carrier_on(vi->dev); 1433 netif_tx_wake_all_queues(vi->dev); 1434 } else { 1435 netif_carrier_off(vi->dev); 1436 netif_tx_stop_all_queues(vi->dev); 1437 } 1438 done: 1439 mutex_unlock(&vi->config_lock); 1440 } 1441 1442 static void virtnet_config_changed(struct virtio_device *vdev) 1443 { 1444 struct virtnet_info *vi = vdev->priv; 1445 1446 schedule_work(&vi->config_work); 1447 } 1448 1449 static void virtnet_free_queues(struct virtnet_info *vi) 1450 { 1451 int i; 1452 1453 for (i = 0; i < vi->max_queue_pairs; i++) 1454 netif_napi_del(&vi->rq[i].napi); 1455 1456 kfree(vi->rq); 1457 kfree(vi->sq); 1458 } 1459 1460 static void free_receive_bufs(struct virtnet_info *vi) 1461 { 1462 int i; 1463 1464 for (i = 0; i < vi->max_queue_pairs; i++) { 1465 while (vi->rq[i].pages) 1466 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1467 } 1468 } 1469 1470 static void free_receive_page_frags(struct virtnet_info *vi) 1471 { 1472 int i; 1473 for (i = 0; i < vi->max_queue_pairs; i++) 1474 if (vi->rq[i].alloc_frag.page) 1475 put_page(vi->rq[i].alloc_frag.page); 1476 } 1477 1478 static void free_unused_bufs(struct virtnet_info *vi) 1479 { 1480 void *buf; 1481 int i; 1482 1483 for (i = 0; i < vi->max_queue_pairs; i++) { 1484 struct virtqueue *vq = vi->sq[i].vq; 1485 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1486 dev_kfree_skb(buf); 1487 } 1488 1489 for (i = 0; i < vi->max_queue_pairs; i++) { 1490 struct virtqueue *vq = vi->rq[i].vq; 1491 1492 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1493 if (vi->mergeable_rx_bufs) { 1494 unsigned long ctx = (unsigned long)buf; 1495 void *base = mergeable_ctx_to_buf_address(ctx); 1496 put_page(virt_to_head_page(base)); 1497 } else if (vi->big_packets) { 1498 give_pages(&vi->rq[i], buf); 1499 } else { 1500 dev_kfree_skb(buf); 1501 } 1502 } 1503 } 1504 } 1505 1506 static void virtnet_del_vqs(struct virtnet_info *vi) 1507 { 1508 struct virtio_device *vdev = vi->vdev; 1509 1510 virtnet_clean_affinity(vi, -1); 1511 1512 vdev->config->del_vqs(vdev); 1513 1514 virtnet_free_queues(vi); 1515 } 1516 1517 static int virtnet_find_vqs(struct virtnet_info *vi) 1518 { 1519 vq_callback_t **callbacks; 1520 struct virtqueue **vqs; 1521 int ret = -ENOMEM; 1522 int i, total_vqs; 1523 const char **names; 1524 1525 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1526 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1527 * possible control vq. 1528 */ 1529 total_vqs = vi->max_queue_pairs * 2 + 1530 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1531 1532 /* Allocate space for find_vqs parameters */ 1533 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1534 if (!vqs) 1535 goto err_vq; 1536 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1537 if (!callbacks) 1538 goto err_callback; 1539 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1540 if (!names) 1541 goto err_names; 1542 1543 /* Parameters for control virtqueue, if any */ 1544 if (vi->has_cvq) { 1545 callbacks[total_vqs - 1] = NULL; 1546 names[total_vqs - 1] = "control"; 1547 } 1548 1549 /* Allocate/initialize parameters for send/receive virtqueues */ 1550 for (i = 0; i < vi->max_queue_pairs; i++) { 1551 callbacks[rxq2vq(i)] = skb_recv_done; 1552 callbacks[txq2vq(i)] = skb_xmit_done; 1553 sprintf(vi->rq[i].name, "input.%d", i); 1554 sprintf(vi->sq[i].name, "output.%d", i); 1555 names[rxq2vq(i)] = vi->rq[i].name; 1556 names[txq2vq(i)] = vi->sq[i].name; 1557 } 1558 1559 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1560 names); 1561 if (ret) 1562 goto err_find; 1563 1564 if (vi->has_cvq) { 1565 vi->cvq = vqs[total_vqs - 1]; 1566 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1567 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1568 } 1569 1570 for (i = 0; i < vi->max_queue_pairs; i++) { 1571 vi->rq[i].vq = vqs[rxq2vq(i)]; 1572 vi->sq[i].vq = vqs[txq2vq(i)]; 1573 } 1574 1575 kfree(names); 1576 kfree(callbacks); 1577 kfree(vqs); 1578 1579 return 0; 1580 1581 err_find: 1582 kfree(names); 1583 err_names: 1584 kfree(callbacks); 1585 err_callback: 1586 kfree(vqs); 1587 err_vq: 1588 return ret; 1589 } 1590 1591 static int virtnet_alloc_queues(struct virtnet_info *vi) 1592 { 1593 int i; 1594 1595 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1596 if (!vi->sq) 1597 goto err_sq; 1598 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1599 if (!vi->rq) 1600 goto err_rq; 1601 1602 INIT_DELAYED_WORK(&vi->refill, refill_work); 1603 for (i = 0; i < vi->max_queue_pairs; i++) { 1604 vi->rq[i].pages = NULL; 1605 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1606 napi_weight); 1607 napi_hash_add(&vi->rq[i].napi); 1608 1609 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1610 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1611 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1612 } 1613 1614 return 0; 1615 1616 err_rq: 1617 kfree(vi->sq); 1618 err_sq: 1619 return -ENOMEM; 1620 } 1621 1622 static int init_vqs(struct virtnet_info *vi) 1623 { 1624 int ret; 1625 1626 /* Allocate send & receive queues */ 1627 ret = virtnet_alloc_queues(vi); 1628 if (ret) 1629 goto err; 1630 1631 ret = virtnet_find_vqs(vi); 1632 if (ret) 1633 goto err_free; 1634 1635 get_online_cpus(); 1636 virtnet_set_affinity(vi); 1637 put_online_cpus(); 1638 1639 return 0; 1640 1641 err_free: 1642 virtnet_free_queues(vi); 1643 err: 1644 return ret; 1645 } 1646 1647 #ifdef CONFIG_SYSFS 1648 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1649 struct rx_queue_attribute *attribute, char *buf) 1650 { 1651 struct virtnet_info *vi = netdev_priv(queue->dev); 1652 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1653 struct ewma *avg; 1654 1655 BUG_ON(queue_index >= vi->max_queue_pairs); 1656 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1657 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1658 } 1659 1660 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1661 __ATTR_RO(mergeable_rx_buffer_size); 1662 1663 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1664 &mergeable_rx_buffer_size_attribute.attr, 1665 NULL 1666 }; 1667 1668 static const struct attribute_group virtio_net_mrg_rx_group = { 1669 .name = "virtio_net", 1670 .attrs = virtio_net_mrg_rx_attrs 1671 }; 1672 #endif 1673 1674 static int virtnet_probe(struct virtio_device *vdev) 1675 { 1676 int i, err; 1677 struct net_device *dev; 1678 struct virtnet_info *vi; 1679 u16 max_queue_pairs; 1680 1681 /* Find if host supports multiqueue virtio_net device */ 1682 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1683 struct virtio_net_config, 1684 max_virtqueue_pairs, &max_queue_pairs); 1685 1686 /* We need at least 2 queue's */ 1687 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1688 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1689 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1690 max_queue_pairs = 1; 1691 1692 /* Allocate ourselves a network device with room for our info */ 1693 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1694 if (!dev) 1695 return -ENOMEM; 1696 1697 /* Set up network device as normal. */ 1698 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1699 dev->netdev_ops = &virtnet_netdev; 1700 dev->features = NETIF_F_HIGHDMA; 1701 1702 dev->ethtool_ops = &virtnet_ethtool_ops; 1703 SET_NETDEV_DEV(dev, &vdev->dev); 1704 1705 /* Do we support "hardware" checksums? */ 1706 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1707 /* This opens up the world of extra features. */ 1708 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1709 if (csum) 1710 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1711 1712 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1713 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1714 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1715 } 1716 /* Individual feature bits: what can host handle? */ 1717 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1718 dev->hw_features |= NETIF_F_TSO; 1719 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1720 dev->hw_features |= NETIF_F_TSO6; 1721 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1722 dev->hw_features |= NETIF_F_TSO_ECN; 1723 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1724 dev->hw_features |= NETIF_F_UFO; 1725 1726 if (gso) 1727 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1728 /* (!csum && gso) case will be fixed by register_netdev() */ 1729 } 1730 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1731 dev->features |= NETIF_F_RXCSUM; 1732 1733 dev->vlan_features = dev->features; 1734 1735 /* Configuration may specify what MAC to use. Otherwise random. */ 1736 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1737 virtio_cread_bytes(vdev, 1738 offsetof(struct virtio_net_config, mac), 1739 dev->dev_addr, dev->addr_len); 1740 else 1741 eth_hw_addr_random(dev); 1742 1743 /* Set up our device-specific information */ 1744 vi = netdev_priv(dev); 1745 vi->dev = dev; 1746 vi->vdev = vdev; 1747 vdev->priv = vi; 1748 vi->stats = alloc_percpu(struct virtnet_stats); 1749 err = -ENOMEM; 1750 if (vi->stats == NULL) 1751 goto free; 1752 1753 for_each_possible_cpu(i) { 1754 struct virtnet_stats *virtnet_stats; 1755 virtnet_stats = per_cpu_ptr(vi->stats, i); 1756 u64_stats_init(&virtnet_stats->tx_syncp); 1757 u64_stats_init(&virtnet_stats->rx_syncp); 1758 } 1759 1760 mutex_init(&vi->config_lock); 1761 vi->config_enable = true; 1762 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1763 1764 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1765 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1766 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1767 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 1768 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 1769 vi->big_packets = true; 1770 1771 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1772 vi->mergeable_rx_bufs = true; 1773 1774 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1775 vi->any_header_sg = true; 1776 1777 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1778 vi->has_cvq = true; 1779 1780 if (vi->any_header_sg) { 1781 if (vi->mergeable_rx_bufs) 1782 dev->needed_headroom = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1783 else 1784 dev->needed_headroom = sizeof(struct virtio_net_hdr); 1785 } 1786 1787 /* Use single tx/rx queue pair as default */ 1788 vi->curr_queue_pairs = 1; 1789 vi->max_queue_pairs = max_queue_pairs; 1790 1791 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1792 err = init_vqs(vi); 1793 if (err) 1794 goto free_stats; 1795 1796 #ifdef CONFIG_SYSFS 1797 if (vi->mergeable_rx_bufs) 1798 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1799 #endif 1800 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1801 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1802 1803 err = register_netdev(dev); 1804 if (err) { 1805 pr_debug("virtio_net: registering device failed\n"); 1806 goto free_vqs; 1807 } 1808 1809 /* Last of all, set up some receive buffers. */ 1810 for (i = 0; i < vi->curr_queue_pairs; i++) { 1811 try_fill_recv(&vi->rq[i], GFP_KERNEL); 1812 1813 /* If we didn't even get one input buffer, we're useless. */ 1814 if (vi->rq[i].vq->num_free == 1815 virtqueue_get_vring_size(vi->rq[i].vq)) { 1816 free_unused_bufs(vi); 1817 err = -ENOMEM; 1818 goto free_recv_bufs; 1819 } 1820 } 1821 1822 vi->nb.notifier_call = &virtnet_cpu_callback; 1823 err = register_hotcpu_notifier(&vi->nb); 1824 if (err) { 1825 pr_debug("virtio_net: registering cpu notifier failed\n"); 1826 goto free_recv_bufs; 1827 } 1828 1829 /* Assume link up if device can't report link status, 1830 otherwise get link status from config. */ 1831 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1832 netif_carrier_off(dev); 1833 schedule_work(&vi->config_work); 1834 } else { 1835 vi->status = VIRTIO_NET_S_LINK_UP; 1836 netif_carrier_on(dev); 1837 } 1838 1839 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1840 dev->name, max_queue_pairs); 1841 1842 return 0; 1843 1844 free_recv_bufs: 1845 free_receive_bufs(vi); 1846 unregister_netdev(dev); 1847 free_vqs: 1848 cancel_delayed_work_sync(&vi->refill); 1849 free_receive_page_frags(vi); 1850 virtnet_del_vqs(vi); 1851 free_stats: 1852 free_percpu(vi->stats); 1853 free: 1854 free_netdev(dev); 1855 return err; 1856 } 1857 1858 static void remove_vq_common(struct virtnet_info *vi) 1859 { 1860 vi->vdev->config->reset(vi->vdev); 1861 1862 /* Free unused buffers in both send and recv, if any. */ 1863 free_unused_bufs(vi); 1864 1865 free_receive_bufs(vi); 1866 1867 free_receive_page_frags(vi); 1868 1869 virtnet_del_vqs(vi); 1870 } 1871 1872 static void virtnet_remove(struct virtio_device *vdev) 1873 { 1874 struct virtnet_info *vi = vdev->priv; 1875 1876 unregister_hotcpu_notifier(&vi->nb); 1877 1878 /* Prevent config work handler from accessing the device. */ 1879 mutex_lock(&vi->config_lock); 1880 vi->config_enable = false; 1881 mutex_unlock(&vi->config_lock); 1882 1883 unregister_netdev(vi->dev); 1884 1885 remove_vq_common(vi); 1886 1887 flush_work(&vi->config_work); 1888 1889 free_percpu(vi->stats); 1890 free_netdev(vi->dev); 1891 } 1892 1893 #ifdef CONFIG_PM_SLEEP 1894 static int virtnet_freeze(struct virtio_device *vdev) 1895 { 1896 struct virtnet_info *vi = vdev->priv; 1897 int i; 1898 1899 unregister_hotcpu_notifier(&vi->nb); 1900 1901 /* Prevent config work handler from accessing the device */ 1902 mutex_lock(&vi->config_lock); 1903 vi->config_enable = false; 1904 mutex_unlock(&vi->config_lock); 1905 1906 netif_device_detach(vi->dev); 1907 cancel_delayed_work_sync(&vi->refill); 1908 1909 if (netif_running(vi->dev)) { 1910 for (i = 0; i < vi->max_queue_pairs; i++) { 1911 napi_disable(&vi->rq[i].napi); 1912 napi_hash_del(&vi->rq[i].napi); 1913 netif_napi_del(&vi->rq[i].napi); 1914 } 1915 } 1916 1917 remove_vq_common(vi); 1918 1919 flush_work(&vi->config_work); 1920 1921 return 0; 1922 } 1923 1924 static int virtnet_restore(struct virtio_device *vdev) 1925 { 1926 struct virtnet_info *vi = vdev->priv; 1927 int err, i; 1928 1929 err = init_vqs(vi); 1930 if (err) 1931 return err; 1932 1933 if (netif_running(vi->dev)) { 1934 for (i = 0; i < vi->curr_queue_pairs; i++) 1935 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) 1936 schedule_delayed_work(&vi->refill, 0); 1937 1938 for (i = 0; i < vi->max_queue_pairs; i++) 1939 virtnet_napi_enable(&vi->rq[i]); 1940 } 1941 1942 netif_device_attach(vi->dev); 1943 1944 mutex_lock(&vi->config_lock); 1945 vi->config_enable = true; 1946 mutex_unlock(&vi->config_lock); 1947 1948 rtnl_lock(); 1949 virtnet_set_queues(vi, vi->curr_queue_pairs); 1950 rtnl_unlock(); 1951 1952 err = register_hotcpu_notifier(&vi->nb); 1953 if (err) 1954 return err; 1955 1956 return 0; 1957 } 1958 #endif 1959 1960 static struct virtio_device_id id_table[] = { 1961 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1962 { 0 }, 1963 }; 1964 1965 static unsigned int features[] = { 1966 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1967 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1968 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 1969 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 1970 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 1971 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 1972 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 1973 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 1974 VIRTIO_NET_F_CTRL_MAC_ADDR, 1975 VIRTIO_F_ANY_LAYOUT, 1976 }; 1977 1978 static struct virtio_driver virtio_net_driver = { 1979 .feature_table = features, 1980 .feature_table_size = ARRAY_SIZE(features), 1981 .driver.name = KBUILD_MODNAME, 1982 .driver.owner = THIS_MODULE, 1983 .id_table = id_table, 1984 .probe = virtnet_probe, 1985 .remove = virtnet_remove, 1986 .config_changed = virtnet_config_changed, 1987 #ifdef CONFIG_PM_SLEEP 1988 .freeze = virtnet_freeze, 1989 .restore = virtnet_restore, 1990 #endif 1991 }; 1992 1993 module_virtio_driver(virtio_net_driver); 1994 1995 MODULE_DEVICE_TABLE(virtio, id_table); 1996 MODULE_DESCRIPTION("Virtio network driver"); 1997 MODULE_LICENSE("GPL"); 1998