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 32static int napi_weight = NAPI_POLL_WEIGHT; 33module_param(napi_weight, int, 0444); 34 35static bool csum = true, gso = true; 36module_param(csum, bool, 0444); 37module_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 55struct 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 */ 66struct 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.$index */ 74 char name[40]; 75}; 76 77/* Internal representation of a receive virtqueue */ 78struct receive_queue { 79 /* Virtqueue associated with this receive_queue */ 80 struct virtqueue *vq; 81 82 struct napi_struct napi; 83 84 /* Chain pages by the private ptr. */ 85 struct page *pages; 86 87 /* Average packet length for mergeable receive buffers. */ 88 struct ewma mrg_avg_pkt_len; 89 90 /* Page frag for packet buffer allocation. */ 91 struct page_frag alloc_frag; 92 93 /* RX: fragments + linear part + virtio header */ 94 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 95 96 /* Name of this receive queue: input.$index */ 97 char name[40]; 98}; 99 100struct 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 /* Active statistics */ 127 struct virtnet_stats __percpu *stats; 128 129 /* Work struct for refilling if we run low on memory. */ 130 struct delayed_work refill; 131 132 /* Work struct for config space updates */ 133 struct work_struct config_work; 134 135 /* Does the affinity hint is set for virtqueues? */ 136 bool affinity_hint_set; 137 138 /* CPU hot plug notifier */ 139 struct notifier_block nb; 140}; 141 142struct skb_vnet_hdr { 143 union { 144 struct virtio_net_hdr hdr; 145 struct virtio_net_hdr_mrg_rxbuf mhdr; 146 }; 147}; 148 149struct padded_vnet_hdr { 150 struct virtio_net_hdr hdr; 151 /* 152 * virtio_net_hdr should be in a separated sg buffer because of a 153 * QEMU bug, and data sg buffer shares same page with this header sg. 154 * This padding makes next sg 16 byte aligned after virtio_net_hdr. 155 */ 156 char padding[6]; 157}; 158 159/* Converting between virtqueue no. and kernel tx/rx queue no. 160 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 161 */ 162static int vq2txq(struct virtqueue *vq) 163{ 164 return (vq->index - 1) / 2; 165} 166 167static int txq2vq(int txq) 168{ 169 return txq * 2 + 1; 170} 171 172static int vq2rxq(struct virtqueue *vq) 173{ 174 return vq->index / 2; 175} 176 177static int rxq2vq(int rxq) 178{ 179 return rxq * 2; 180} 181 182static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) 183{ 184 return (struct skb_vnet_hdr *)skb->cb; 185} 186 187/* 188 * private is used to chain pages for big packets, put the whole 189 * most recent used list in the beginning for reuse 190 */ 191static void give_pages(struct receive_queue *rq, struct page *page) 192{ 193 struct page *end; 194 195 /* Find end of list, sew whole thing into vi->rq.pages. */ 196 for (end = page; end->private; end = (struct page *)end->private); 197 end->private = (unsigned long)rq->pages; 198 rq->pages = page; 199} 200 201static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 202{ 203 struct page *p = rq->pages; 204 205 if (p) { 206 rq->pages = (struct page *)p->private; 207 /* clear private here, it is used to chain pages */ 208 p->private = 0; 209 } else 210 p = alloc_page(gfp_mask); 211 return p; 212} 213 214static void skb_xmit_done(struct virtqueue *vq) 215{ 216 struct virtnet_info *vi = vq->vdev->priv; 217 218 /* Suppress further interrupts. */ 219 virtqueue_disable_cb(vq); 220 221 /* We were probably waiting for more output buffers. */ 222 netif_wake_subqueue(vi->dev, vq2txq(vq)); 223} 224 225static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) 226{ 227 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); 228 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; 229} 230 231static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) 232{ 233 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); 234 235} 236 237static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) 238{ 239 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; 240 return (unsigned long)buf | (size - 1); 241} 242 243/* Called from bottom half context */ 244static struct sk_buff *page_to_skb(struct receive_queue *rq, 245 struct page *page, unsigned int offset, 246 unsigned int len, unsigned int truesize) 247{ 248 struct virtnet_info *vi = rq->vq->vdev->priv; 249 struct sk_buff *skb; 250 struct skb_vnet_hdr *hdr; 251 unsigned int copy, hdr_len, hdr_padded_len; 252 char *p; 253 254 p = page_address(page) + offset; 255 256 /* copy small packet so we can reuse these pages for small data */ 257 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); 258 if (unlikely(!skb)) 259 return NULL; 260 261 hdr = skb_vnet_hdr(skb); 262 263 if (vi->mergeable_rx_bufs) { 264 hdr_len = sizeof hdr->mhdr; 265 hdr_padded_len = sizeof hdr->mhdr; 266 } else { 267 hdr_len = sizeof hdr->hdr; 268 hdr_padded_len = sizeof(struct padded_vnet_hdr); 269 } 270 271 memcpy(hdr, p, hdr_len); 272 273 len -= hdr_len; 274 offset += hdr_padded_len; 275 p += hdr_padded_len; 276 277 copy = len; 278 if (copy > skb_tailroom(skb)) 279 copy = skb_tailroom(skb); 280 memcpy(skb_put(skb, copy), p, copy); 281 282 len -= copy; 283 offset += copy; 284 285 if (vi->mergeable_rx_bufs) { 286 if (len) 287 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 288 else 289 put_page(page); 290 return skb; 291 } 292 293 /* 294 * Verify that we can indeed put this data into a skb. 295 * This is here to handle cases when the device erroneously 296 * tries to receive more than is possible. This is usually 297 * the case of a broken device. 298 */ 299 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 300 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 301 dev_kfree_skb(skb); 302 return NULL; 303 } 304 BUG_ON(offset >= PAGE_SIZE); 305 while (len) { 306 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 307 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 308 frag_size, truesize); 309 len -= frag_size; 310 page = (struct page *)page->private; 311 offset = 0; 312 } 313 314 if (page) 315 give_pages(rq, page); 316 317 return skb; 318} 319 320static struct sk_buff *receive_small(void *buf, unsigned int len) 321{ 322 struct sk_buff * skb = buf; 323 324 len -= sizeof(struct virtio_net_hdr); 325 skb_trim(skb, len); 326 327 return skb; 328} 329 330static struct sk_buff *receive_big(struct net_device *dev, 331 struct receive_queue *rq, 332 void *buf, 333 unsigned int len) 334{ 335 struct page *page = buf; 336 struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE); 337 338 if (unlikely(!skb)) 339 goto err; 340 341 return skb; 342 343err: 344 dev->stats.rx_dropped++; 345 give_pages(rq, page); 346 return NULL; 347} 348 349static struct sk_buff *receive_mergeable(struct net_device *dev, 350 struct receive_queue *rq, 351 unsigned long ctx, 352 unsigned int len) 353{ 354 void *buf = mergeable_ctx_to_buf_address(ctx); 355 struct skb_vnet_hdr *hdr = buf; 356 int num_buf = hdr->mhdr.num_buffers; 357 struct page *page = virt_to_head_page(buf); 358 int offset = buf - page_address(page); 359 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 360 361 struct sk_buff *head_skb = page_to_skb(rq, page, offset, len, truesize); 362 struct sk_buff *curr_skb = head_skb; 363 364 if (unlikely(!curr_skb)) 365 goto err_skb; 366 while (--num_buf) { 367 int num_skb_frags; 368 369 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 370 if (unlikely(!ctx)) { 371 pr_debug("%s: rx error: %d buffers out of %d missing\n", 372 dev->name, num_buf, hdr->mhdr.num_buffers); 373 dev->stats.rx_length_errors++; 374 goto err_buf; 375 } 376 377 buf = mergeable_ctx_to_buf_address(ctx); 378 page = virt_to_head_page(buf); 379 380 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 381 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 382 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 383 384 if (unlikely(!nskb)) 385 goto err_skb; 386 if (curr_skb == head_skb) 387 skb_shinfo(curr_skb)->frag_list = nskb; 388 else 389 curr_skb->next = nskb; 390 curr_skb = nskb; 391 head_skb->truesize += nskb->truesize; 392 num_skb_frags = 0; 393 } 394 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 395 if (curr_skb != head_skb) { 396 head_skb->data_len += len; 397 head_skb->len += len; 398 head_skb->truesize += truesize; 399 } 400 offset = buf - page_address(page); 401 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 402 put_page(page); 403 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 404 len, truesize); 405 } else { 406 skb_add_rx_frag(curr_skb, num_skb_frags, page, 407 offset, len, truesize); 408 } 409 } 410 411 ewma_add(&rq->mrg_avg_pkt_len, head_skb->len); 412 return head_skb; 413 414err_skb: 415 put_page(page); 416 while (--num_buf) { 417 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 418 if (unlikely(!ctx)) { 419 pr_debug("%s: rx error: %d buffers missing\n", 420 dev->name, num_buf); 421 dev->stats.rx_length_errors++; 422 break; 423 } 424 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); 425 put_page(page); 426 } 427err_buf: 428 dev->stats.rx_dropped++; 429 dev_kfree_skb(head_skb); 430 return NULL; 431} 432 433static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) 434{ 435 struct virtnet_info *vi = rq->vq->vdev->priv; 436 struct net_device *dev = vi->dev; 437 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 438 struct sk_buff *skb; 439 struct skb_vnet_hdr *hdr; 440 441 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { 442 pr_debug("%s: short packet %i\n", dev->name, len); 443 dev->stats.rx_length_errors++; 444 if (vi->mergeable_rx_bufs) { 445 unsigned long ctx = (unsigned long)buf; 446 void *base = mergeable_ctx_to_buf_address(ctx); 447 put_page(virt_to_head_page(base)); 448 } else if (vi->big_packets) { 449 give_pages(rq, buf); 450 } else { 451 dev_kfree_skb(buf); 452 } 453 return; 454 } 455 456 if (vi->mergeable_rx_bufs) 457 skb = receive_mergeable(dev, rq, (unsigned long)buf, len); 458 else if (vi->big_packets) 459 skb = receive_big(dev, rq, buf, len); 460 else 461 skb = receive_small(buf, len); 462 463 if (unlikely(!skb)) 464 return; 465 466 hdr = skb_vnet_hdr(skb); 467 468 u64_stats_update_begin(&stats->rx_syncp); 469 stats->rx_bytes += skb->len; 470 stats->rx_packets++; 471 u64_stats_update_end(&stats->rx_syncp); 472 473 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 474 pr_debug("Needs csum!\n"); 475 if (!skb_partial_csum_set(skb, 476 hdr->hdr.csum_start, 477 hdr->hdr.csum_offset)) 478 goto frame_err; 479 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { 480 skb->ip_summed = CHECKSUM_UNNECESSARY; 481 } 482 483 skb->protocol = eth_type_trans(skb, dev); 484 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 485 ntohs(skb->protocol), skb->len, skb->pkt_type); 486 487 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { 488 pr_debug("GSO!\n"); 489 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 490 case VIRTIO_NET_HDR_GSO_TCPV4: 491 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 492 break; 493 case VIRTIO_NET_HDR_GSO_UDP: 494 { 495 static bool warned; 496 497 if (!warned) { 498 warned = true; 499 netdev_warn(dev, 500 "host using disabled UFO feature; please fix it\n"); 501 } 502 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 503 break; 504 } 505 case VIRTIO_NET_HDR_GSO_TCPV6: 506 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 507 break; 508 default: 509 net_warn_ratelimited("%s: bad gso type %u.\n", 510 dev->name, hdr->hdr.gso_type); 511 goto frame_err; 512 } 513 514 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 515 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 516 517 skb_shinfo(skb)->gso_size = hdr->hdr.gso_size; 518 if (skb_shinfo(skb)->gso_size == 0) { 519 net_warn_ratelimited("%s: zero gso size.\n", dev->name); 520 goto frame_err; 521 } 522 523 /* Header must be checked, and gso_segs computed. */ 524 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 525 skb_shinfo(skb)->gso_segs = 0; 526 } 527 528 skb_mark_napi_id(skb, &rq->napi); 529 530 netif_receive_skb(skb); 531 return; 532 533frame_err: 534 dev->stats.rx_frame_errors++; 535 dev_kfree_skb(skb); 536} 537 538static int add_recvbuf_small(struct receive_queue *rq, gfp_t gfp) 539{ 540 struct virtnet_info *vi = rq->vq->vdev->priv; 541 struct sk_buff *skb; 542 struct skb_vnet_hdr *hdr; 543 int err; 544 545 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); 546 if (unlikely(!skb)) 547 return -ENOMEM; 548 549 skb_put(skb, GOOD_PACKET_LEN); 550 551 hdr = skb_vnet_hdr(skb); 552 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 553 sg_set_buf(rq->sg, &hdr->hdr, sizeof hdr->hdr); 554 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); 555 556 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); 557 if (err < 0) 558 dev_kfree_skb(skb); 559 560 return err; 561} 562 563static int add_recvbuf_big(struct receive_queue *rq, gfp_t gfp) 564{ 565 struct page *first, *list = NULL; 566 char *p; 567 int i, err, offset; 568 569 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 570 571 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 572 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 573 first = get_a_page(rq, gfp); 574 if (!first) { 575 if (list) 576 give_pages(rq, list); 577 return -ENOMEM; 578 } 579 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 580 581 /* chain new page in list head to match sg */ 582 first->private = (unsigned long)list; 583 list = first; 584 } 585 586 first = get_a_page(rq, gfp); 587 if (!first) { 588 give_pages(rq, list); 589 return -ENOMEM; 590 } 591 p = page_address(first); 592 593 /* rq->sg[0], rq->sg[1] share the same page */ 594 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ 595 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); 596 597 /* rq->sg[1] for data packet, from offset */ 598 offset = sizeof(struct padded_vnet_hdr); 599 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 600 601 /* chain first in list head */ 602 first->private = (unsigned long)list; 603 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 604 first, gfp); 605 if (err < 0) 606 give_pages(rq, first); 607 608 return err; 609} 610 611static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) 612{ 613 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 614 unsigned int len; 615 616 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), 617 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); 618 return ALIGN(len, MERGEABLE_BUFFER_ALIGN); 619} 620 621static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) 622{ 623 struct page_frag *alloc_frag = &rq->alloc_frag; 624 char *buf; 625 unsigned long ctx; 626 int err; 627 unsigned int len, hole; 628 629 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); 630 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 631 return -ENOMEM; 632 633 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 634 ctx = mergeable_buf_to_ctx(buf, len); 635 get_page(alloc_frag->page); 636 alloc_frag->offset += len; 637 hole = alloc_frag->size - alloc_frag->offset; 638 if (hole < len) { 639 /* To avoid internal fragmentation, if there is very likely not 640 * enough space for another buffer, add the remaining space to 641 * the current buffer. This extra space is not included in 642 * the truesize stored in ctx. 643 */ 644 len += hole; 645 alloc_frag->offset += hole; 646 } 647 648 sg_init_one(rq->sg, buf, len); 649 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); 650 if (err < 0) 651 put_page(virt_to_head_page(buf)); 652 653 return err; 654} 655 656/* 657 * Returns false if we couldn't fill entirely (OOM). 658 * 659 * Normally run in the receive path, but can also be run from ndo_open 660 * before we're receiving packets, or from refill_work which is 661 * careful to disable receiving (using napi_disable). 662 */ 663static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) 664{ 665 struct virtnet_info *vi = rq->vq->vdev->priv; 666 int err; 667 bool oom; 668 669 gfp |= __GFP_COLD; 670 do { 671 if (vi->mergeable_rx_bufs) 672 err = add_recvbuf_mergeable(rq, gfp); 673 else if (vi->big_packets) 674 err = add_recvbuf_big(rq, gfp); 675 else 676 err = add_recvbuf_small(rq, gfp); 677 678 oom = err == -ENOMEM; 679 if (err) 680 break; 681 } while (rq->vq->num_free); 682 virtqueue_kick(rq->vq); 683 return !oom; 684} 685 686static void skb_recv_done(struct virtqueue *rvq) 687{ 688 struct virtnet_info *vi = rvq->vdev->priv; 689 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 690 691 /* Schedule NAPI, Suppress further interrupts if successful. */ 692 if (napi_schedule_prep(&rq->napi)) { 693 virtqueue_disable_cb(rvq); 694 __napi_schedule(&rq->napi); 695 } 696} 697 698static void virtnet_napi_enable(struct receive_queue *rq) 699{ 700 napi_enable(&rq->napi); 701 702 /* If all buffers were filled by other side before we napi_enabled, we 703 * won't get another interrupt, so process any outstanding packets 704 * now. virtnet_poll wants re-enable the queue, so we disable here. 705 * We synchronize against interrupts via NAPI_STATE_SCHED */ 706 if (napi_schedule_prep(&rq->napi)) { 707 virtqueue_disable_cb(rq->vq); 708 local_bh_disable(); 709 __napi_schedule(&rq->napi); 710 local_bh_enable(); 711 } 712} 713 714static void refill_work(struct work_struct *work) 715{ 716 struct virtnet_info *vi = 717 container_of(work, struct virtnet_info, refill.work); 718 bool still_empty; 719 int i; 720 721 for (i = 0; i < vi->curr_queue_pairs; i++) { 722 struct receive_queue *rq = &vi->rq[i]; 723 724 napi_disable(&rq->napi); 725 still_empty = !try_fill_recv(rq, GFP_KERNEL); 726 virtnet_napi_enable(rq); 727 728 /* In theory, this can happen: if we don't get any buffers in 729 * we will *never* try to fill again. 730 */ 731 if (still_empty) 732 schedule_delayed_work(&vi->refill, HZ/2); 733 } 734} 735 736static int virtnet_receive(struct receive_queue *rq, int budget) 737{ 738 struct virtnet_info *vi = rq->vq->vdev->priv; 739 unsigned int len, received = 0; 740 void *buf; 741 742 while (received < budget && 743 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 744 receive_buf(rq, buf, len); 745 received++; 746 } 747 748 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 749 if (!try_fill_recv(rq, GFP_ATOMIC)) 750 schedule_delayed_work(&vi->refill, 0); 751 } 752 753 return received; 754} 755 756static int virtnet_poll(struct napi_struct *napi, int budget) 757{ 758 struct receive_queue *rq = 759 container_of(napi, struct receive_queue, napi); 760 unsigned int r, received = 0; 761 762again: 763 received += virtnet_receive(rq, budget - received); 764 765 /* Out of packets? */ 766 if (received < budget) { 767 r = virtqueue_enable_cb_prepare(rq->vq); 768 napi_complete(napi); 769 if (unlikely(virtqueue_poll(rq->vq, r)) && 770 napi_schedule_prep(napi)) { 771 virtqueue_disable_cb(rq->vq); 772 __napi_schedule(napi); 773 goto again; 774 } 775 } 776 777 return received; 778} 779 780#ifdef CONFIG_NET_RX_BUSY_POLL 781/* must be called with local_bh_disable()d */ 782static int virtnet_busy_poll(struct napi_struct *napi) 783{ 784 struct receive_queue *rq = 785 container_of(napi, struct receive_queue, napi); 786 struct virtnet_info *vi = rq->vq->vdev->priv; 787 int r, received = 0, budget = 4; 788 789 if (!(vi->status & VIRTIO_NET_S_LINK_UP)) 790 return LL_FLUSH_FAILED; 791 792 if (!napi_schedule_prep(napi)) 793 return LL_FLUSH_BUSY; 794 795 virtqueue_disable_cb(rq->vq); 796 797again: 798 received += virtnet_receive(rq, budget); 799 800 r = virtqueue_enable_cb_prepare(rq->vq); 801 clear_bit(NAPI_STATE_SCHED, &napi->state); 802 if (unlikely(virtqueue_poll(rq->vq, r)) && 803 napi_schedule_prep(napi)) { 804 virtqueue_disable_cb(rq->vq); 805 if (received < budget) { 806 budget -= received; 807 goto again; 808 } else { 809 __napi_schedule(napi); 810 } 811 } 812 813 return received; 814} 815#endif /* CONFIG_NET_RX_BUSY_POLL */ 816 817static int virtnet_open(struct net_device *dev) 818{ 819 struct virtnet_info *vi = netdev_priv(dev); 820 int i; 821 822 for (i = 0; i < vi->max_queue_pairs; i++) { 823 if (i < vi->curr_queue_pairs) 824 /* Make sure we have some buffers: if oom use wq. */ 825 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) 826 schedule_delayed_work(&vi->refill, 0); 827 virtnet_napi_enable(&vi->rq[i]); 828 } 829 830 return 0; 831} 832 833static void free_old_xmit_skbs(struct send_queue *sq) 834{ 835 struct sk_buff *skb; 836 unsigned int len; 837 struct virtnet_info *vi = sq->vq->vdev->priv; 838 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 839 840 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 841 pr_debug("Sent skb %p\n", skb); 842 843 u64_stats_update_begin(&stats->tx_syncp); 844 stats->tx_bytes += skb->len; 845 stats->tx_packets++; 846 u64_stats_update_end(&stats->tx_syncp); 847 848 dev_kfree_skb_any(skb); 849 } 850} 851 852static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 853{ 854 struct skb_vnet_hdr *hdr; 855 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 856 struct virtnet_info *vi = sq->vq->vdev->priv; 857 unsigned num_sg; 858 unsigned hdr_len; 859 bool can_push; 860 861 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 862 if (vi->mergeable_rx_bufs) 863 hdr_len = sizeof hdr->mhdr; 864 else 865 hdr_len = sizeof hdr->hdr; 866 867 can_push = vi->any_header_sg && 868 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 869 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 870 /* Even if we can, don't push here yet as this would skew 871 * csum_start offset below. */ 872 if (can_push) 873 hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len); 874 else 875 hdr = skb_vnet_hdr(skb); 876 877 if (skb->ip_summed == CHECKSUM_PARTIAL) { 878 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 879 hdr->hdr.csum_start = skb_checksum_start_offset(skb); 880 hdr->hdr.csum_offset = skb->csum_offset; 881 } else { 882 hdr->hdr.flags = 0; 883 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 884 } 885 886 if (skb_is_gso(skb)) { 887 hdr->hdr.hdr_len = skb_headlen(skb); 888 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; 889 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 890 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 891 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 892 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 893 else 894 BUG(); 895 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 896 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 897 } else { 898 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 899 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 900 } 901 902 if (vi->mergeable_rx_bufs) 903 hdr->mhdr.num_buffers = 0; 904 905 sg_init_table(sq->sg, MAX_SKB_FRAGS + 2); 906 if (can_push) { 907 __skb_push(skb, hdr_len); 908 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 909 /* Pull header back to avoid skew in tx bytes calculations. */ 910 __skb_pull(skb, hdr_len); 911 } else { 912 sg_set_buf(sq->sg, hdr, hdr_len); 913 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; 914 } 915 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 916} 917 918static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 919{ 920 struct virtnet_info *vi = netdev_priv(dev); 921 int qnum = skb_get_queue_mapping(skb); 922 struct send_queue *sq = &vi->sq[qnum]; 923 int err; 924 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 925 bool kick = !skb->xmit_more; 926 927 /* Free up any pending old buffers before queueing new ones. */ 928 free_old_xmit_skbs(sq); 929 930 /* Try to transmit */ 931 err = xmit_skb(sq, skb); 932 933 /* This should not happen! */ 934 if (unlikely(err)) { 935 dev->stats.tx_fifo_errors++; 936 if (net_ratelimit()) 937 dev_warn(&dev->dev, 938 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 939 dev->stats.tx_dropped++; 940 dev_kfree_skb_any(skb); 941 return NETDEV_TX_OK; 942 } 943 944 /* Don't wait up for transmitted skbs to be freed. */ 945 skb_orphan(skb); 946 nf_reset(skb); 947 948 /* Apparently nice girls don't return TX_BUSY; stop the queue 949 * before it gets out of hand. Naturally, this wastes entries. */ 950 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 951 netif_stop_subqueue(dev, qnum); 952 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 953 /* More just got used, free them then recheck. */ 954 free_old_xmit_skbs(sq); 955 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 956 netif_start_subqueue(dev, qnum); 957 virtqueue_disable_cb(sq->vq); 958 } 959 } 960 } 961 962 if (kick || netif_xmit_stopped(txq)) 963 virtqueue_kick(sq->vq); 964 965 return NETDEV_TX_OK; 966} 967 968/* 969 * Send command via the control virtqueue and check status. Commands 970 * supported by the hypervisor, as indicated by feature bits, should 971 * never fail unless improperly formatted. 972 */ 973static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 974 struct scatterlist *out) 975{ 976 struct scatterlist *sgs[4], hdr, stat; 977 struct virtio_net_ctrl_hdr ctrl; 978 virtio_net_ctrl_ack status = ~0; 979 unsigned out_num = 0, tmp; 980 981 /* Caller should know better */ 982 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 983 984 ctrl.class = class; 985 ctrl.cmd = cmd; 986 /* Add header */ 987 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 988 sgs[out_num++] = &hdr; 989 990 if (out) 991 sgs[out_num++] = out; 992 993 /* Add return status. */ 994 sg_init_one(&stat, &status, sizeof(status)); 995 sgs[out_num] = &stat; 996 997 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 998 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 999 1000 if (unlikely(!virtqueue_kick(vi->cvq))) 1001 return status == VIRTIO_NET_OK; 1002 1003 /* Spin for a response, the kick causes an ioport write, trapping 1004 * into the hypervisor, so the request should be handled immediately. 1005 */ 1006 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1007 !virtqueue_is_broken(vi->cvq)) 1008 cpu_relax(); 1009 1010 return status == VIRTIO_NET_OK; 1011} 1012 1013static int virtnet_set_mac_address(struct net_device *dev, void *p) 1014{ 1015 struct virtnet_info *vi = netdev_priv(dev); 1016 struct virtio_device *vdev = vi->vdev; 1017 int ret; 1018 struct sockaddr *addr = p; 1019 struct scatterlist sg; 1020 1021 ret = eth_prepare_mac_addr_change(dev, p); 1022 if (ret) 1023 return ret; 1024 1025 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1026 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1027 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1028 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1029 dev_warn(&vdev->dev, 1030 "Failed to set mac address by vq command.\n"); 1031 return -EINVAL; 1032 } 1033 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 1034 unsigned int i; 1035 1036 /* Naturally, this has an atomicity problem. */ 1037 for (i = 0; i < dev->addr_len; i++) 1038 virtio_cwrite8(vdev, 1039 offsetof(struct virtio_net_config, mac) + 1040 i, addr->sa_data[i]); 1041 } 1042 1043 eth_commit_mac_addr_change(dev, p); 1044 1045 return 0; 1046} 1047 1048static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1049 struct rtnl_link_stats64 *tot) 1050{ 1051 struct virtnet_info *vi = netdev_priv(dev); 1052 int cpu; 1053 unsigned int start; 1054 1055 for_each_possible_cpu(cpu) { 1056 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1057 u64 tpackets, tbytes, rpackets, rbytes; 1058 1059 do { 1060 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1061 tpackets = stats->tx_packets; 1062 tbytes = stats->tx_bytes; 1063 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1064 1065 do { 1066 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1067 rpackets = stats->rx_packets; 1068 rbytes = stats->rx_bytes; 1069 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1070 1071 tot->rx_packets += rpackets; 1072 tot->tx_packets += tpackets; 1073 tot->rx_bytes += rbytes; 1074 tot->tx_bytes += tbytes; 1075 } 1076 1077 tot->tx_dropped = dev->stats.tx_dropped; 1078 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1079 tot->rx_dropped = dev->stats.rx_dropped; 1080 tot->rx_length_errors = dev->stats.rx_length_errors; 1081 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1082 1083 return tot; 1084} 1085 1086#ifdef CONFIG_NET_POLL_CONTROLLER 1087static void virtnet_netpoll(struct net_device *dev) 1088{ 1089 struct virtnet_info *vi = netdev_priv(dev); 1090 int i; 1091 1092 for (i = 0; i < vi->curr_queue_pairs; i++) 1093 napi_schedule(&vi->rq[i].napi); 1094} 1095#endif 1096 1097static void virtnet_ack_link_announce(struct virtnet_info *vi) 1098{ 1099 rtnl_lock(); 1100 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1101 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1102 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1103 rtnl_unlock(); 1104} 1105 1106static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1107{ 1108 struct scatterlist sg; 1109 struct virtio_net_ctrl_mq s; 1110 struct net_device *dev = vi->dev; 1111 1112 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1113 return 0; 1114 1115 s.virtqueue_pairs = queue_pairs; 1116 sg_init_one(&sg, &s, sizeof(s)); 1117 1118 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1119 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1120 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1121 queue_pairs); 1122 return -EINVAL; 1123 } else { 1124 vi->curr_queue_pairs = queue_pairs; 1125 /* virtnet_open() will refill when device is going to up. */ 1126 if (dev->flags & IFF_UP) 1127 schedule_delayed_work(&vi->refill, 0); 1128 } 1129 1130 return 0; 1131} 1132 1133static int virtnet_close(struct net_device *dev) 1134{ 1135 struct virtnet_info *vi = netdev_priv(dev); 1136 int i; 1137 1138 /* Make sure refill_work doesn't re-enable napi! */ 1139 cancel_delayed_work_sync(&vi->refill); 1140 1141 for (i = 0; i < vi->max_queue_pairs; i++) 1142 napi_disable(&vi->rq[i].napi); 1143 1144 return 0; 1145} 1146 1147static void virtnet_set_rx_mode(struct net_device *dev) 1148{ 1149 struct virtnet_info *vi = netdev_priv(dev); 1150 struct scatterlist sg[2]; 1151 u8 promisc, allmulti; 1152 struct virtio_net_ctrl_mac *mac_data; 1153 struct netdev_hw_addr *ha; 1154 int uc_count; 1155 int mc_count; 1156 void *buf; 1157 int i; 1158 1159 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1160 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1161 return; 1162 1163 promisc = ((dev->flags & IFF_PROMISC) != 0); 1164 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1165 1166 sg_init_one(sg, &promisc, sizeof(promisc)); 1167 1168 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1169 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1170 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1171 promisc ? "en" : "dis"); 1172 1173 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1174 1175 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1176 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1177 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1178 allmulti ? "en" : "dis"); 1179 1180 uc_count = netdev_uc_count(dev); 1181 mc_count = netdev_mc_count(dev); 1182 /* MAC filter - use one buffer for both lists */ 1183 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1184 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1185 mac_data = buf; 1186 if (!buf) 1187 return; 1188 1189 sg_init_table(sg, 2); 1190 1191 /* Store the unicast list and count in the front of the buffer */ 1192 mac_data->entries = uc_count; 1193 i = 0; 1194 netdev_for_each_uc_addr(ha, dev) 1195 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1196 1197 sg_set_buf(&sg[0], mac_data, 1198 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1199 1200 /* multicast list and count fill the end */ 1201 mac_data = (void *)&mac_data->macs[uc_count][0]; 1202 1203 mac_data->entries = mc_count; 1204 i = 0; 1205 netdev_for_each_mc_addr(ha, dev) 1206 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1207 1208 sg_set_buf(&sg[1], mac_data, 1209 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1210 1211 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1212 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1213 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1214 1215 kfree(buf); 1216} 1217 1218static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1219 __be16 proto, u16 vid) 1220{ 1221 struct virtnet_info *vi = netdev_priv(dev); 1222 struct scatterlist sg; 1223 1224 sg_init_one(&sg, &vid, sizeof(vid)); 1225 1226 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1227 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1228 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1229 return 0; 1230} 1231 1232static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1233 __be16 proto, u16 vid) 1234{ 1235 struct virtnet_info *vi = netdev_priv(dev); 1236 struct scatterlist sg; 1237 1238 sg_init_one(&sg, &vid, sizeof(vid)); 1239 1240 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1241 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1242 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1243 return 0; 1244} 1245 1246static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1247{ 1248 int i; 1249 1250 if (vi->affinity_hint_set) { 1251 for (i = 0; i < vi->max_queue_pairs; i++) { 1252 virtqueue_set_affinity(vi->rq[i].vq, -1); 1253 virtqueue_set_affinity(vi->sq[i].vq, -1); 1254 } 1255 1256 vi->affinity_hint_set = false; 1257 } 1258} 1259 1260static void virtnet_set_affinity(struct virtnet_info *vi) 1261{ 1262 int i; 1263 int cpu; 1264 1265 /* In multiqueue mode, when the number of cpu is equal to the number of 1266 * queue pairs, we let the queue pairs to be private to one cpu by 1267 * setting the affinity hint to eliminate the contention. 1268 */ 1269 if (vi->curr_queue_pairs == 1 || 1270 vi->max_queue_pairs != num_online_cpus()) { 1271 virtnet_clean_affinity(vi, -1); 1272 return; 1273 } 1274 1275 i = 0; 1276 for_each_online_cpu(cpu) { 1277 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1278 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1279 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1280 i++; 1281 } 1282 1283 vi->affinity_hint_set = true; 1284} 1285 1286static int virtnet_cpu_callback(struct notifier_block *nfb, 1287 unsigned long action, void *hcpu) 1288{ 1289 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1290 1291 switch(action & ~CPU_TASKS_FROZEN) { 1292 case CPU_ONLINE: 1293 case CPU_DOWN_FAILED: 1294 case CPU_DEAD: 1295 virtnet_set_affinity(vi); 1296 break; 1297 case CPU_DOWN_PREPARE: 1298 virtnet_clean_affinity(vi, (long)hcpu); 1299 break; 1300 default: 1301 break; 1302 } 1303 1304 return NOTIFY_OK; 1305} 1306 1307static void virtnet_get_ringparam(struct net_device *dev, 1308 struct ethtool_ringparam *ring) 1309{ 1310 struct virtnet_info *vi = netdev_priv(dev); 1311 1312 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1313 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1314 ring->rx_pending = ring->rx_max_pending; 1315 ring->tx_pending = ring->tx_max_pending; 1316} 1317 1318 1319static void virtnet_get_drvinfo(struct net_device *dev, 1320 struct ethtool_drvinfo *info) 1321{ 1322 struct virtnet_info *vi = netdev_priv(dev); 1323 struct virtio_device *vdev = vi->vdev; 1324 1325 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1326 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1327 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1328 1329} 1330 1331/* TODO: Eliminate OOO packets during switching */ 1332static int virtnet_set_channels(struct net_device *dev, 1333 struct ethtool_channels *channels) 1334{ 1335 struct virtnet_info *vi = netdev_priv(dev); 1336 u16 queue_pairs = channels->combined_count; 1337 int err; 1338 1339 /* We don't support separate rx/tx channels. 1340 * We don't allow setting 'other' channels. 1341 */ 1342 if (channels->rx_count || channels->tx_count || channels->other_count) 1343 return -EINVAL; 1344 1345 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1346 return -EINVAL; 1347 1348 get_online_cpus(); 1349 err = virtnet_set_queues(vi, queue_pairs); 1350 if (!err) { 1351 netif_set_real_num_tx_queues(dev, queue_pairs); 1352 netif_set_real_num_rx_queues(dev, queue_pairs); 1353 1354 virtnet_set_affinity(vi); 1355 } 1356 put_online_cpus(); 1357 1358 return err; 1359} 1360 1361static void virtnet_get_channels(struct net_device *dev, 1362 struct ethtool_channels *channels) 1363{ 1364 struct virtnet_info *vi = netdev_priv(dev); 1365 1366 channels->combined_count = vi->curr_queue_pairs; 1367 channels->max_combined = vi->max_queue_pairs; 1368 channels->max_other = 0; 1369 channels->rx_count = 0; 1370 channels->tx_count = 0; 1371 channels->other_count = 0; 1372} 1373 1374static const struct ethtool_ops virtnet_ethtool_ops = { 1375 .get_drvinfo = virtnet_get_drvinfo, 1376 .get_link = ethtool_op_get_link, 1377 .get_ringparam = virtnet_get_ringparam, 1378 .set_channels = virtnet_set_channels, 1379 .get_channels = virtnet_get_channels, 1380}; 1381 1382#define MIN_MTU 68 1383#define MAX_MTU 65535 1384 1385static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1386{ 1387 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1388 return -EINVAL; 1389 dev->mtu = new_mtu; 1390 return 0; 1391} 1392 1393static const struct net_device_ops virtnet_netdev = { 1394 .ndo_open = virtnet_open, 1395 .ndo_stop = virtnet_close, 1396 .ndo_start_xmit = start_xmit, 1397 .ndo_validate_addr = eth_validate_addr, 1398 .ndo_set_mac_address = virtnet_set_mac_address, 1399 .ndo_set_rx_mode = virtnet_set_rx_mode, 1400 .ndo_change_mtu = virtnet_change_mtu, 1401 .ndo_get_stats64 = virtnet_stats, 1402 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1403 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1404#ifdef CONFIG_NET_POLL_CONTROLLER 1405 .ndo_poll_controller = virtnet_netpoll, 1406#endif 1407#ifdef CONFIG_NET_RX_BUSY_POLL 1408 .ndo_busy_poll = virtnet_busy_poll, 1409#endif 1410}; 1411 1412static void virtnet_config_changed_work(struct work_struct *work) 1413{ 1414 struct virtnet_info *vi = 1415 container_of(work, struct virtnet_info, config_work); 1416 u16 v; 1417 1418 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1419 struct virtio_net_config, status, &v) < 0) 1420 return; 1421 1422 if (v & VIRTIO_NET_S_ANNOUNCE) { 1423 netdev_notify_peers(vi->dev); 1424 virtnet_ack_link_announce(vi); 1425 } 1426 1427 /* Ignore unknown (future) status bits */ 1428 v &= VIRTIO_NET_S_LINK_UP; 1429 1430 if (vi->status == v) 1431 return; 1432 1433 vi->status = v; 1434 1435 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1436 netif_carrier_on(vi->dev); 1437 netif_tx_wake_all_queues(vi->dev); 1438 } else { 1439 netif_carrier_off(vi->dev); 1440 netif_tx_stop_all_queues(vi->dev); 1441 } 1442} 1443 1444static void virtnet_config_changed(struct virtio_device *vdev) 1445{ 1446 struct virtnet_info *vi = vdev->priv; 1447 1448 schedule_work(&vi->config_work); 1449} 1450 1451static void virtnet_free_queues(struct virtnet_info *vi) 1452{ 1453 int i; 1454 1455 for (i = 0; i < vi->max_queue_pairs; i++) 1456 netif_napi_del(&vi->rq[i].napi); 1457 1458 kfree(vi->rq); 1459 kfree(vi->sq); 1460} 1461 1462static void free_receive_bufs(struct virtnet_info *vi) 1463{ 1464 int i; 1465 1466 for (i = 0; i < vi->max_queue_pairs; i++) { 1467 while (vi->rq[i].pages) 1468 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1469 } 1470} 1471 1472static void free_receive_page_frags(struct virtnet_info *vi) 1473{ 1474 int i; 1475 for (i = 0; i < vi->max_queue_pairs; i++) 1476 if (vi->rq[i].alloc_frag.page) 1477 put_page(vi->rq[i].alloc_frag.page); 1478} 1479 1480static void free_unused_bufs(struct virtnet_info *vi) 1481{ 1482 void *buf; 1483 int i; 1484 1485 for (i = 0; i < vi->max_queue_pairs; i++) { 1486 struct virtqueue *vq = vi->sq[i].vq; 1487 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1488 dev_kfree_skb(buf); 1489 } 1490 1491 for (i = 0; i < vi->max_queue_pairs; i++) { 1492 struct virtqueue *vq = vi->rq[i].vq; 1493 1494 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1495 if (vi->mergeable_rx_bufs) { 1496 unsigned long ctx = (unsigned long)buf; 1497 void *base = mergeable_ctx_to_buf_address(ctx); 1498 put_page(virt_to_head_page(base)); 1499 } else if (vi->big_packets) { 1500 give_pages(&vi->rq[i], buf); 1501 } else { 1502 dev_kfree_skb(buf); 1503 } 1504 } 1505 } 1506} 1507 1508static void virtnet_del_vqs(struct virtnet_info *vi) 1509{ 1510 struct virtio_device *vdev = vi->vdev; 1511 1512 virtnet_clean_affinity(vi, -1); 1513 1514 vdev->config->del_vqs(vdev); 1515 1516 virtnet_free_queues(vi); 1517} 1518 1519static int virtnet_find_vqs(struct virtnet_info *vi) 1520{ 1521 vq_callback_t **callbacks; 1522 struct virtqueue **vqs; 1523 int ret = -ENOMEM; 1524 int i, total_vqs; 1525 const char **names; 1526 1527 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1528 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1529 * possible control vq. 1530 */ 1531 total_vqs = vi->max_queue_pairs * 2 + 1532 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1533 1534 /* Allocate space for find_vqs parameters */ 1535 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1536 if (!vqs) 1537 goto err_vq; 1538 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1539 if (!callbacks) 1540 goto err_callback; 1541 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1542 if (!names) 1543 goto err_names; 1544 1545 /* Parameters for control virtqueue, if any */ 1546 if (vi->has_cvq) { 1547 callbacks[total_vqs - 1] = NULL; 1548 names[total_vqs - 1] = "control"; 1549 } 1550 1551 /* Allocate/initialize parameters for send/receive virtqueues */ 1552 for (i = 0; i < vi->max_queue_pairs; i++) { 1553 callbacks[rxq2vq(i)] = skb_recv_done; 1554 callbacks[txq2vq(i)] = skb_xmit_done; 1555 sprintf(vi->rq[i].name, "input.%d", i); 1556 sprintf(vi->sq[i].name, "output.%d", i); 1557 names[rxq2vq(i)] = vi->rq[i].name; 1558 names[txq2vq(i)] = vi->sq[i].name; 1559 } 1560 1561 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1562 names); 1563 if (ret) 1564 goto err_find; 1565 1566 if (vi->has_cvq) { 1567 vi->cvq = vqs[total_vqs - 1]; 1568 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1569 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1570 } 1571 1572 for (i = 0; i < vi->max_queue_pairs; i++) { 1573 vi->rq[i].vq = vqs[rxq2vq(i)]; 1574 vi->sq[i].vq = vqs[txq2vq(i)]; 1575 } 1576 1577 kfree(names); 1578 kfree(callbacks); 1579 kfree(vqs); 1580 1581 return 0; 1582 1583err_find: 1584 kfree(names); 1585err_names: 1586 kfree(callbacks); 1587err_callback: 1588 kfree(vqs); 1589err_vq: 1590 return ret; 1591} 1592 1593static int virtnet_alloc_queues(struct virtnet_info *vi) 1594{ 1595 int i; 1596 1597 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1598 if (!vi->sq) 1599 goto err_sq; 1600 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1601 if (!vi->rq) 1602 goto err_rq; 1603 1604 INIT_DELAYED_WORK(&vi->refill, refill_work); 1605 for (i = 0; i < vi->max_queue_pairs; i++) { 1606 vi->rq[i].pages = NULL; 1607 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1608 napi_weight); 1609 napi_hash_add(&vi->rq[i].napi); 1610 1611 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1612 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1613 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1614 } 1615 1616 return 0; 1617 1618err_rq: 1619 kfree(vi->sq); 1620err_sq: 1621 return -ENOMEM; 1622} 1623 1624static int init_vqs(struct virtnet_info *vi) 1625{ 1626 int ret; 1627 1628 /* Allocate send & receive queues */ 1629 ret = virtnet_alloc_queues(vi); 1630 if (ret) 1631 goto err; 1632 1633 ret = virtnet_find_vqs(vi); 1634 if (ret) 1635 goto err_free; 1636 1637 get_online_cpus(); 1638 virtnet_set_affinity(vi); 1639 put_online_cpus(); 1640 1641 return 0; 1642 1643err_free: 1644 virtnet_free_queues(vi); 1645err: 1646 return ret; 1647} 1648 1649#ifdef CONFIG_SYSFS 1650static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1651 struct rx_queue_attribute *attribute, char *buf) 1652{ 1653 struct virtnet_info *vi = netdev_priv(queue->dev); 1654 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1655 struct ewma *avg; 1656 1657 BUG_ON(queue_index >= vi->max_queue_pairs); 1658 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1659 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1660} 1661 1662static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1663 __ATTR_RO(mergeable_rx_buffer_size); 1664 1665static struct attribute *virtio_net_mrg_rx_attrs[] = { 1666 &mergeable_rx_buffer_size_attribute.attr, 1667 NULL 1668}; 1669 1670static const struct attribute_group virtio_net_mrg_rx_group = { 1671 .name = "virtio_net", 1672 .attrs = virtio_net_mrg_rx_attrs 1673}; 1674#endif 1675 1676static bool virtnet_fail_on_feature(struct virtio_device *vdev, 1677 unsigned int fbit, 1678 const char *fname, const char *dname) 1679{ 1680 if (!virtio_has_feature(vdev, fbit)) 1681 return false; 1682 1683 dev_err(&vdev->dev, "device advertises feature %s but not %s", 1684 fname, dname); 1685 1686 return true; 1687} 1688 1689#define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 1690 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 1691 1692static bool virtnet_validate_features(struct virtio_device *vdev) 1693{ 1694 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 1695 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 1696 "VIRTIO_NET_F_CTRL_VQ") || 1697 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 1698 "VIRTIO_NET_F_CTRL_VQ") || 1699 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 1700 "VIRTIO_NET_F_CTRL_VQ") || 1701 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 1702 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 1703 "VIRTIO_NET_F_CTRL_VQ"))) { 1704 return false; 1705 } 1706 1707 return true; 1708} 1709 1710static int virtnet_probe(struct virtio_device *vdev) 1711{ 1712 int i, err; 1713 struct net_device *dev; 1714 struct virtnet_info *vi; 1715 u16 max_queue_pairs; 1716 1717 if (!virtnet_validate_features(vdev)) 1718 return -EINVAL; 1719 1720 /* Find if host supports multiqueue virtio_net device */ 1721 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1722 struct virtio_net_config, 1723 max_virtqueue_pairs, &max_queue_pairs); 1724 1725 /* We need at least 2 queue's */ 1726 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1727 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1728 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1729 max_queue_pairs = 1; 1730 1731 /* Allocate ourselves a network device with room for our info */ 1732 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1733 if (!dev) 1734 return -ENOMEM; 1735 1736 /* Set up network device as normal. */ 1737 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1738 dev->netdev_ops = &virtnet_netdev; 1739 dev->features = NETIF_F_HIGHDMA; 1740 1741 dev->ethtool_ops = &virtnet_ethtool_ops; 1742 SET_NETDEV_DEV(dev, &vdev->dev); 1743 1744 /* Do we support "hardware" checksums? */ 1745 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1746 /* This opens up the world of extra features. */ 1747 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1748 if (csum) 1749 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1750 1751 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1752 dev->hw_features |= NETIF_F_TSO 1753 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1754 } 1755 /* Individual feature bits: what can host handle? */ 1756 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1757 dev->hw_features |= NETIF_F_TSO; 1758 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1759 dev->hw_features |= NETIF_F_TSO6; 1760 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1761 dev->hw_features |= NETIF_F_TSO_ECN; 1762 1763 if (gso) 1764 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 1765 /* (!csum && gso) case will be fixed by register_netdev() */ 1766 } 1767 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1768 dev->features |= NETIF_F_RXCSUM; 1769 1770 dev->vlan_features = dev->features; 1771 1772 /* Configuration may specify what MAC to use. Otherwise random. */ 1773 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1774 virtio_cread_bytes(vdev, 1775 offsetof(struct virtio_net_config, mac), 1776 dev->dev_addr, dev->addr_len); 1777 else 1778 eth_hw_addr_random(dev); 1779 1780 /* Set up our device-specific information */ 1781 vi = netdev_priv(dev); 1782 vi->dev = dev; 1783 vi->vdev = vdev; 1784 vdev->priv = vi; 1785 vi->stats = alloc_percpu(struct virtnet_stats); 1786 err = -ENOMEM; 1787 if (vi->stats == NULL) 1788 goto free; 1789 1790 for_each_possible_cpu(i) { 1791 struct virtnet_stats *virtnet_stats; 1792 virtnet_stats = per_cpu_ptr(vi->stats, i); 1793 u64_stats_init(&virtnet_stats->tx_syncp); 1794 u64_stats_init(&virtnet_stats->rx_syncp); 1795 } 1796 1797 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1798 1799 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1800 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1801 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1802 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) 1803 vi->big_packets = true; 1804 1805 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1806 vi->mergeable_rx_bufs = true; 1807 1808 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1809 vi->any_header_sg = true; 1810 1811 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1812 vi->has_cvq = true; 1813 1814 if (vi->any_header_sg) { 1815 if (vi->mergeable_rx_bufs) 1816 dev->needed_headroom = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1817 else 1818 dev->needed_headroom = sizeof(struct virtio_net_hdr); 1819 } 1820 1821 /* Use single tx/rx queue pair as default */ 1822 vi->curr_queue_pairs = 1; 1823 vi->max_queue_pairs = max_queue_pairs; 1824 1825 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1826 err = init_vqs(vi); 1827 if (err) 1828 goto free_stats; 1829 1830#ifdef CONFIG_SYSFS 1831 if (vi->mergeable_rx_bufs) 1832 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1833#endif 1834 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1835 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1836 1837 err = register_netdev(dev); 1838 if (err) { 1839 pr_debug("virtio_net: registering device failed\n"); 1840 goto free_vqs; 1841 } 1842 1843 virtio_device_ready(vdev); 1844 1845 /* Last of all, set up some receive buffers. */ 1846 for (i = 0; i < vi->curr_queue_pairs; i++) { 1847 try_fill_recv(&vi->rq[i], GFP_KERNEL); 1848 1849 /* If we didn't even get one input buffer, we're useless. */ 1850 if (vi->rq[i].vq->num_free == 1851 virtqueue_get_vring_size(vi->rq[i].vq)) { 1852 free_unused_bufs(vi); 1853 err = -ENOMEM; 1854 goto free_recv_bufs; 1855 } 1856 } 1857 1858 vi->nb.notifier_call = &virtnet_cpu_callback; 1859 err = register_hotcpu_notifier(&vi->nb); 1860 if (err) { 1861 pr_debug("virtio_net: registering cpu notifier failed\n"); 1862 goto free_recv_bufs; 1863 } 1864 1865 /* Assume link up if device can't report link status, 1866 otherwise get link status from config. */ 1867 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1868 netif_carrier_off(dev); 1869 schedule_work(&vi->config_work); 1870 } else { 1871 vi->status = VIRTIO_NET_S_LINK_UP; 1872 netif_carrier_on(dev); 1873 } 1874 1875 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1876 dev->name, max_queue_pairs); 1877 1878 return 0; 1879 1880free_recv_bufs: 1881 vi->vdev->config->reset(vdev); 1882 1883 free_receive_bufs(vi); 1884 unregister_netdev(dev); 1885free_vqs: 1886 cancel_delayed_work_sync(&vi->refill); 1887 free_receive_page_frags(vi); 1888 virtnet_del_vqs(vi); 1889free_stats: 1890 free_percpu(vi->stats); 1891free: 1892 free_netdev(dev); 1893 return err; 1894} 1895 1896static void remove_vq_common(struct virtnet_info *vi) 1897{ 1898 vi->vdev->config->reset(vi->vdev); 1899 1900 /* Free unused buffers in both send and recv, if any. */ 1901 free_unused_bufs(vi); 1902 1903 free_receive_bufs(vi); 1904 1905 free_receive_page_frags(vi); 1906 1907 virtnet_del_vqs(vi); 1908} 1909 1910static void virtnet_remove(struct virtio_device *vdev) 1911{ 1912 struct virtnet_info *vi = vdev->priv; 1913 1914 unregister_hotcpu_notifier(&vi->nb); 1915 1916 /* Make sure no work handler is accessing the device. */ 1917 flush_work(&vi->config_work); 1918 1919 unregister_netdev(vi->dev); 1920 1921 remove_vq_common(vi); 1922 1923 free_percpu(vi->stats); 1924 free_netdev(vi->dev); 1925} 1926 1927#ifdef CONFIG_PM_SLEEP 1928static int virtnet_freeze(struct virtio_device *vdev) 1929{ 1930 struct virtnet_info *vi = vdev->priv; 1931 int i; 1932 1933 unregister_hotcpu_notifier(&vi->nb); 1934 1935 /* Make sure no work handler is accessing the device */ 1936 flush_work(&vi->config_work); 1937 1938 netif_device_detach(vi->dev); 1939 cancel_delayed_work_sync(&vi->refill); 1940 1941 if (netif_running(vi->dev)) { 1942 for (i = 0; i < vi->max_queue_pairs; i++) { 1943 napi_disable(&vi->rq[i].napi); 1944 napi_hash_del(&vi->rq[i].napi); 1945 netif_napi_del(&vi->rq[i].napi); 1946 } 1947 } 1948 1949 remove_vq_common(vi); 1950 1951 return 0; 1952} 1953 1954static int virtnet_restore(struct virtio_device *vdev) 1955{ 1956 struct virtnet_info *vi = vdev->priv; 1957 int err, i; 1958 1959 err = init_vqs(vi); 1960 if (err) 1961 return err; 1962 1963 virtio_device_ready(vdev); 1964 1965 if (netif_running(vi->dev)) { 1966 for (i = 0; i < vi->curr_queue_pairs; i++) 1967 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) 1968 schedule_delayed_work(&vi->refill, 0); 1969 1970 for (i = 0; i < vi->max_queue_pairs; i++) 1971 virtnet_napi_enable(&vi->rq[i]); 1972 } 1973 1974 netif_device_attach(vi->dev); 1975 1976 rtnl_lock(); 1977 virtnet_set_queues(vi, vi->curr_queue_pairs); 1978 rtnl_unlock(); 1979 1980 err = register_hotcpu_notifier(&vi->nb); 1981 if (err) 1982 return err; 1983 1984 return 0; 1985} 1986#endif 1987 1988static struct virtio_device_id id_table[] = { 1989 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1990 { 0 }, 1991}; 1992 1993static unsigned int features[] = { 1994 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1995 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1996 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_TSO6, 1997 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 1998 VIRTIO_NET_F_GUEST_ECN, 1999 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 2000 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 2001 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 2002 VIRTIO_NET_F_CTRL_MAC_ADDR, 2003 VIRTIO_F_ANY_LAYOUT, 2004}; 2005 2006static struct virtio_driver virtio_net_driver = { 2007 .feature_table = features, 2008 .feature_table_size = ARRAY_SIZE(features), 2009 .driver.name = KBUILD_MODNAME, 2010 .driver.owner = THIS_MODULE, 2011 .id_table = id_table, 2012 .probe = virtnet_probe, 2013 .remove = virtnet_remove, 2014 .config_changed = virtnet_config_changed, 2015#ifdef CONFIG_PM_SLEEP 2016 .freeze = virtnet_freeze, 2017 .restore = virtnet_restore, 2018#endif 2019}; 2020 2021module_virtio_driver(virtio_net_driver); 2022 2023MODULE_DEVICE_TABLE(virtio, id_table); 2024MODULE_DESCRIPTION("Virtio network driver"); 2025MODULE_LICENSE("GPL"); 2026