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 /* Packet virtio header size */ 127 u8 hdr_len; 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 /* Does the affinity hint is set for virtqueues? */ 139 bool affinity_hint_set; 140 141 /* CPU hot plug notifier */ 142 struct notifier_block nb; 143 }; 144 145 struct padded_vnet_hdr { 146 struct virtio_net_hdr_mrg_rxbuf hdr; 147 /* 148 * hdr is in a separate sg buffer, and data sg buffer shares same page 149 * with this header sg. This padding makes next sg 16 byte aligned 150 * after the header. 151 */ 152 char padding[4]; 153 }; 154 155 /* Converting between virtqueue no. and kernel tx/rx queue no. 156 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 157 */ 158 static int vq2txq(struct virtqueue *vq) 159 { 160 return (vq->index - 1) / 2; 161 } 162 163 static int txq2vq(int txq) 164 { 165 return txq * 2 + 1; 166 } 167 168 static int vq2rxq(struct virtqueue *vq) 169 { 170 return vq->index / 2; 171 } 172 173 static int rxq2vq(int rxq) 174 { 175 return rxq * 2; 176 } 177 178 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 179 { 180 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 181 } 182 183 /* 184 * private is used to chain pages for big packets, put the whole 185 * most recent used list in the beginning for reuse 186 */ 187 static void give_pages(struct receive_queue *rq, struct page *page) 188 { 189 struct page *end; 190 191 /* Find end of list, sew whole thing into vi->rq.pages. */ 192 for (end = page; end->private; end = (struct page *)end->private); 193 end->private = (unsigned long)rq->pages; 194 rq->pages = page; 195 } 196 197 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 198 { 199 struct page *p = rq->pages; 200 201 if (p) { 202 rq->pages = (struct page *)p->private; 203 /* clear private here, it is used to chain pages */ 204 p->private = 0; 205 } else 206 p = alloc_page(gfp_mask); 207 return p; 208 } 209 210 static void skb_xmit_done(struct virtqueue *vq) 211 { 212 struct virtnet_info *vi = vq->vdev->priv; 213 214 /* Suppress further interrupts. */ 215 virtqueue_disable_cb(vq); 216 217 /* We were probably waiting for more output buffers. */ 218 netif_wake_subqueue(vi->dev, vq2txq(vq)); 219 } 220 221 static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) 222 { 223 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); 224 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; 225 } 226 227 static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) 228 { 229 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); 230 231 } 232 233 static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) 234 { 235 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; 236 return (unsigned long)buf | (size - 1); 237 } 238 239 /* Called from bottom half context */ 240 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 241 struct receive_queue *rq, 242 struct page *page, unsigned int offset, 243 unsigned int len, unsigned int truesize) 244 { 245 struct sk_buff *skb; 246 struct virtio_net_hdr_mrg_rxbuf *hdr; 247 unsigned int copy, hdr_len, hdr_padded_len; 248 char *p; 249 250 p = page_address(page) + offset; 251 252 /* copy small packet so we can reuse these pages for small data */ 253 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); 254 if (unlikely(!skb)) 255 return NULL; 256 257 hdr = skb_vnet_hdr(skb); 258 259 hdr_len = vi->hdr_len; 260 if (vi->mergeable_rx_bufs) 261 hdr_padded_len = sizeof *hdr; 262 else 263 hdr_padded_len = sizeof(struct padded_vnet_hdr); 264 265 memcpy(hdr, p, hdr_len); 266 267 len -= hdr_len; 268 offset += hdr_padded_len; 269 p += hdr_padded_len; 270 271 copy = len; 272 if (copy > skb_tailroom(skb)) 273 copy = skb_tailroom(skb); 274 memcpy(skb_put(skb, copy), p, copy); 275 276 len -= copy; 277 offset += copy; 278 279 if (vi->mergeable_rx_bufs) { 280 if (len) 281 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 282 else 283 put_page(page); 284 return skb; 285 } 286 287 /* 288 * Verify that we can indeed put this data into a skb. 289 * This is here to handle cases when the device erroneously 290 * tries to receive more than is possible. This is usually 291 * the case of a broken device. 292 */ 293 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 294 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 295 dev_kfree_skb(skb); 296 return NULL; 297 } 298 BUG_ON(offset >= PAGE_SIZE); 299 while (len) { 300 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 301 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 302 frag_size, truesize); 303 len -= frag_size; 304 page = (struct page *)page->private; 305 offset = 0; 306 } 307 308 if (page) 309 give_pages(rq, page); 310 311 return skb; 312 } 313 314 static struct sk_buff *receive_small(struct virtnet_info *vi, void *buf, unsigned int len) 315 { 316 struct sk_buff * skb = buf; 317 318 len -= vi->hdr_len; 319 skb_trim(skb, len); 320 321 return skb; 322 } 323 324 static struct sk_buff *receive_big(struct net_device *dev, 325 struct virtnet_info *vi, 326 struct receive_queue *rq, 327 void *buf, 328 unsigned int len) 329 { 330 struct page *page = buf; 331 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); 332 333 if (unlikely(!skb)) 334 goto err; 335 336 return skb; 337 338 err: 339 dev->stats.rx_dropped++; 340 give_pages(rq, page); 341 return NULL; 342 } 343 344 static struct sk_buff *receive_mergeable(struct net_device *dev, 345 struct virtnet_info *vi, 346 struct receive_queue *rq, 347 unsigned long ctx, 348 unsigned int len) 349 { 350 void *buf = mergeable_ctx_to_buf_address(ctx); 351 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 352 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 353 struct page *page = virt_to_head_page(buf); 354 int offset = buf - page_address(page); 355 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 356 357 struct sk_buff *head_skb = page_to_skb(vi, rq, page, offset, len, 358 truesize); 359 struct sk_buff *curr_skb = head_skb; 360 361 if (unlikely(!curr_skb)) 362 goto err_skb; 363 while (--num_buf) { 364 int num_skb_frags; 365 366 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 367 if (unlikely(!ctx)) { 368 pr_debug("%s: rx error: %d buffers out of %d missing\n", 369 dev->name, num_buf, 370 virtio16_to_cpu(vi->vdev, 371 hdr->num_buffers)); 372 dev->stats.rx_length_errors++; 373 goto err_buf; 374 } 375 376 buf = mergeable_ctx_to_buf_address(ctx); 377 page = virt_to_head_page(buf); 378 379 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 380 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 381 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 382 383 if (unlikely(!nskb)) 384 goto err_skb; 385 if (curr_skb == head_skb) 386 skb_shinfo(curr_skb)->frag_list = nskb; 387 else 388 curr_skb->next = nskb; 389 curr_skb = nskb; 390 head_skb->truesize += nskb->truesize; 391 num_skb_frags = 0; 392 } 393 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 394 if (curr_skb != head_skb) { 395 head_skb->data_len += len; 396 head_skb->len += len; 397 head_skb->truesize += truesize; 398 } 399 offset = buf - page_address(page); 400 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 401 put_page(page); 402 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 403 len, truesize); 404 } else { 405 skb_add_rx_frag(curr_skb, num_skb_frags, page, 406 offset, len, truesize); 407 } 408 } 409 410 ewma_add(&rq->mrg_avg_pkt_len, head_skb->len); 411 return head_skb; 412 413 err_skb: 414 put_page(page); 415 while (--num_buf) { 416 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 417 if (unlikely(!ctx)) { 418 pr_debug("%s: rx error: %d buffers missing\n", 419 dev->name, num_buf); 420 dev->stats.rx_length_errors++; 421 break; 422 } 423 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); 424 put_page(page); 425 } 426 err_buf: 427 dev->stats.rx_dropped++; 428 dev_kfree_skb(head_skb); 429 return NULL; 430 } 431 432 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 433 void *buf, unsigned int len) 434 { 435 struct net_device *dev = vi->dev; 436 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 437 struct sk_buff *skb; 438 struct virtio_net_hdr_mrg_rxbuf *hdr; 439 440 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 441 pr_debug("%s: short packet %i\n", dev->name, len); 442 dev->stats.rx_length_errors++; 443 if (vi->mergeable_rx_bufs) { 444 unsigned long ctx = (unsigned long)buf; 445 void *base = mergeable_ctx_to_buf_address(ctx); 446 put_page(virt_to_head_page(base)); 447 } else if (vi->big_packets) { 448 give_pages(rq, buf); 449 } else { 450 dev_kfree_skb(buf); 451 } 452 return; 453 } 454 455 if (vi->mergeable_rx_bufs) 456 skb = receive_mergeable(dev, vi, rq, (unsigned long)buf, len); 457 else if (vi->big_packets) 458 skb = receive_big(dev, vi, rq, buf, len); 459 else 460 skb = receive_small(vi, buf, len); 461 462 if (unlikely(!skb)) 463 return; 464 465 hdr = skb_vnet_hdr(skb); 466 467 u64_stats_update_begin(&stats->rx_syncp); 468 stats->rx_bytes += skb->len; 469 stats->rx_packets++; 470 u64_stats_update_end(&stats->rx_syncp); 471 472 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 473 pr_debug("Needs csum!\n"); 474 if (!skb_partial_csum_set(skb, 475 virtio16_to_cpu(vi->vdev, hdr->hdr.csum_start), 476 virtio16_to_cpu(vi->vdev, hdr->hdr.csum_offset))) 477 goto frame_err; 478 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { 479 skb->ip_summed = CHECKSUM_UNNECESSARY; 480 } 481 482 skb->protocol = eth_type_trans(skb, dev); 483 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 484 ntohs(skb->protocol), skb->len, skb->pkt_type); 485 486 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { 487 pr_debug("GSO!\n"); 488 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 489 case VIRTIO_NET_HDR_GSO_TCPV4: 490 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 491 break; 492 case VIRTIO_NET_HDR_GSO_UDP: 493 { 494 static bool warned; 495 496 if (!warned) { 497 warned = true; 498 netdev_warn(dev, 499 "host using disabled UFO feature; please fix it\n"); 500 } 501 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 502 break; 503 } 504 case VIRTIO_NET_HDR_GSO_TCPV6: 505 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 506 break; 507 default: 508 net_warn_ratelimited("%s: bad gso type %u.\n", 509 dev->name, hdr->hdr.gso_type); 510 goto frame_err; 511 } 512 513 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 514 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 515 516 skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev, 517 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; 532 533 frame_err: 534 dev->stats.rx_frame_errors++; 535 dev_kfree_skb(skb); 536 } 537 538 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 539 gfp_t gfp) 540 { 541 struct sk_buff *skb; 542 struct virtio_net_hdr_mrg_rxbuf *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, vi->hdr_len); 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 } 562 563 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 564 gfp_t gfp) 565 { 566 struct page *first, *list = NULL; 567 char *p; 568 int i, err, offset; 569 570 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 571 572 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 573 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 574 first = get_a_page(rq, gfp); 575 if (!first) { 576 if (list) 577 give_pages(rq, list); 578 return -ENOMEM; 579 } 580 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 581 582 /* chain new page in list head to match sg */ 583 first->private = (unsigned long)list; 584 list = first; 585 } 586 587 first = get_a_page(rq, gfp); 588 if (!first) { 589 give_pages(rq, list); 590 return -ENOMEM; 591 } 592 p = page_address(first); 593 594 /* rq->sg[0], rq->sg[1] share the same page */ 595 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 596 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 597 598 /* rq->sg[1] for data packet, from offset */ 599 offset = sizeof(struct padded_vnet_hdr); 600 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 601 602 /* chain first in list head */ 603 first->private = (unsigned long)list; 604 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 605 first, gfp); 606 if (err < 0) 607 give_pages(rq, first); 608 609 return err; 610 } 611 612 static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) 613 { 614 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 615 unsigned int len; 616 617 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), 618 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); 619 return ALIGN(len, MERGEABLE_BUFFER_ALIGN); 620 } 621 622 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) 623 { 624 struct page_frag *alloc_frag = &rq->alloc_frag; 625 char *buf; 626 unsigned long ctx; 627 int err; 628 unsigned int len, hole; 629 630 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); 631 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 632 return -ENOMEM; 633 634 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 635 ctx = mergeable_buf_to_ctx(buf, len); 636 get_page(alloc_frag->page); 637 alloc_frag->offset += len; 638 hole = alloc_frag->size - alloc_frag->offset; 639 if (hole < len) { 640 /* To avoid internal fragmentation, if there is very likely not 641 * enough space for another buffer, add the remaining space to 642 * the current buffer. This extra space is not included in 643 * the truesize stored in ctx. 644 */ 645 len += hole; 646 alloc_frag->offset += hole; 647 } 648 649 sg_init_one(rq->sg, buf, len); 650 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); 651 if (err < 0) 652 put_page(virt_to_head_page(buf)); 653 654 return err; 655 } 656 657 /* 658 * Returns false if we couldn't fill entirely (OOM). 659 * 660 * Normally run in the receive path, but can also be run from ndo_open 661 * before we're receiving packets, or from refill_work which is 662 * careful to disable receiving (using napi_disable). 663 */ 664 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 665 gfp_t gfp) 666 { 667 int err; 668 bool oom; 669 670 gfp |= __GFP_COLD; 671 do { 672 if (vi->mergeable_rx_bufs) 673 err = add_recvbuf_mergeable(rq, gfp); 674 else if (vi->big_packets) 675 err = add_recvbuf_big(vi, rq, gfp); 676 else 677 err = add_recvbuf_small(vi, rq, gfp); 678 679 oom = err == -ENOMEM; 680 if (err) 681 break; 682 } while (rq->vq->num_free); 683 virtqueue_kick(rq->vq); 684 return !oom; 685 } 686 687 static void skb_recv_done(struct virtqueue *rvq) 688 { 689 struct virtnet_info *vi = rvq->vdev->priv; 690 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 691 692 /* Schedule NAPI, Suppress further interrupts if successful. */ 693 if (napi_schedule_prep(&rq->napi)) { 694 virtqueue_disable_cb(rvq); 695 __napi_schedule(&rq->napi); 696 } 697 } 698 699 static void virtnet_napi_enable(struct receive_queue *rq) 700 { 701 napi_enable(&rq->napi); 702 703 /* If all buffers were filled by other side before we napi_enabled, we 704 * won't get another interrupt, so process any outstanding packets 705 * now. virtnet_poll wants re-enable the queue, so we disable here. 706 * We synchronize against interrupts via NAPI_STATE_SCHED */ 707 if (napi_schedule_prep(&rq->napi)) { 708 virtqueue_disable_cb(rq->vq); 709 local_bh_disable(); 710 __napi_schedule(&rq->napi); 711 local_bh_enable(); 712 } 713 } 714 715 static void refill_work(struct work_struct *work) 716 { 717 struct virtnet_info *vi = 718 container_of(work, struct virtnet_info, refill.work); 719 bool still_empty; 720 int i; 721 722 for (i = 0; i < vi->curr_queue_pairs; i++) { 723 struct receive_queue *rq = &vi->rq[i]; 724 725 napi_disable(&rq->napi); 726 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 727 virtnet_napi_enable(rq); 728 729 /* In theory, this can happen: if we don't get any buffers in 730 * we will *never* try to fill again. 731 */ 732 if (still_empty) 733 schedule_delayed_work(&vi->refill, HZ/2); 734 } 735 } 736 737 static int virtnet_receive(struct receive_queue *rq, int budget) 738 { 739 struct virtnet_info *vi = rq->vq->vdev->priv; 740 unsigned int len, received = 0; 741 void *buf; 742 743 while (received < budget && 744 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 745 receive_buf(vi, rq, buf, len); 746 received++; 747 } 748 749 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 750 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) 751 schedule_delayed_work(&vi->refill, 0); 752 } 753 754 return received; 755 } 756 757 static int virtnet_poll(struct napi_struct *napi, int budget) 758 { 759 struct receive_queue *rq = 760 container_of(napi, struct receive_queue, napi); 761 unsigned int r, received = 0; 762 763 again: 764 received += virtnet_receive(rq, budget - received); 765 766 /* Out of packets? */ 767 if (received < budget) { 768 r = virtqueue_enable_cb_prepare(rq->vq); 769 napi_complete(napi); 770 if (unlikely(virtqueue_poll(rq->vq, r)) && 771 napi_schedule_prep(napi)) { 772 virtqueue_disable_cb(rq->vq); 773 __napi_schedule(napi); 774 goto again; 775 } 776 } 777 778 return received; 779 } 780 781 #ifdef CONFIG_NET_RX_BUSY_POLL 782 /* must be called with local_bh_disable()d */ 783 static int virtnet_busy_poll(struct napi_struct *napi) 784 { 785 struct receive_queue *rq = 786 container_of(napi, struct receive_queue, napi); 787 struct virtnet_info *vi = rq->vq->vdev->priv; 788 int r, received = 0, budget = 4; 789 790 if (!(vi->status & VIRTIO_NET_S_LINK_UP)) 791 return LL_FLUSH_FAILED; 792 793 if (!napi_schedule_prep(napi)) 794 return LL_FLUSH_BUSY; 795 796 virtqueue_disable_cb(rq->vq); 797 798 again: 799 received += virtnet_receive(rq, budget); 800 801 r = virtqueue_enable_cb_prepare(rq->vq); 802 clear_bit(NAPI_STATE_SCHED, &napi->state); 803 if (unlikely(virtqueue_poll(rq->vq, r)) && 804 napi_schedule_prep(napi)) { 805 virtqueue_disable_cb(rq->vq); 806 if (received < budget) { 807 budget -= received; 808 goto again; 809 } else { 810 __napi_schedule(napi); 811 } 812 } 813 814 return received; 815 } 816 #endif /* CONFIG_NET_RX_BUSY_POLL */ 817 818 static int virtnet_open(struct net_device *dev) 819 { 820 struct virtnet_info *vi = netdev_priv(dev); 821 int i; 822 823 for (i = 0; i < vi->max_queue_pairs; i++) { 824 if (i < vi->curr_queue_pairs) 825 /* Make sure we have some buffers: if oom use wq. */ 826 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 827 schedule_delayed_work(&vi->refill, 0); 828 virtnet_napi_enable(&vi->rq[i]); 829 } 830 831 return 0; 832 } 833 834 static void free_old_xmit_skbs(struct send_queue *sq) 835 { 836 struct sk_buff *skb; 837 unsigned int len; 838 struct virtnet_info *vi = sq->vq->vdev->priv; 839 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 840 841 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 842 pr_debug("Sent skb %p\n", skb); 843 844 u64_stats_update_begin(&stats->tx_syncp); 845 stats->tx_bytes += skb->len; 846 stats->tx_packets++; 847 u64_stats_update_end(&stats->tx_syncp); 848 849 dev_kfree_skb_any(skb); 850 } 851 } 852 853 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 854 { 855 struct virtio_net_hdr_mrg_rxbuf *hdr; 856 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 857 struct virtnet_info *vi = sq->vq->vdev->priv; 858 unsigned num_sg; 859 unsigned hdr_len = vi->hdr_len; 860 bool can_push; 861 862 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 863 864 can_push = vi->any_header_sg && 865 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 866 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 867 /* Even if we can, don't push here yet as this would skew 868 * csum_start offset below. */ 869 if (can_push) 870 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 871 else 872 hdr = skb_vnet_hdr(skb); 873 874 if (skb->ip_summed == CHECKSUM_PARTIAL) { 875 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 876 hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev, 877 skb_checksum_start_offset(skb)); 878 hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev, 879 skb->csum_offset); 880 } else { 881 hdr->hdr.flags = 0; 882 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 883 } 884 885 if (skb_is_gso(skb)) { 886 hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb)); 887 hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev, 888 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->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 } 917 918 static 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 */ 973 static 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 1013 static 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 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1035 unsigned int i; 1036 1037 /* Naturally, this has an atomicity problem. */ 1038 for (i = 0; i < dev->addr_len; i++) 1039 virtio_cwrite8(vdev, 1040 offsetof(struct virtio_net_config, mac) + 1041 i, addr->sa_data[i]); 1042 } 1043 1044 eth_commit_mac_addr_change(dev, p); 1045 1046 return 0; 1047 } 1048 1049 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1050 struct rtnl_link_stats64 *tot) 1051 { 1052 struct virtnet_info *vi = netdev_priv(dev); 1053 int cpu; 1054 unsigned int start; 1055 1056 for_each_possible_cpu(cpu) { 1057 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1058 u64 tpackets, tbytes, rpackets, rbytes; 1059 1060 do { 1061 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1062 tpackets = stats->tx_packets; 1063 tbytes = stats->tx_bytes; 1064 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1065 1066 do { 1067 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1068 rpackets = stats->rx_packets; 1069 rbytes = stats->rx_bytes; 1070 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1071 1072 tot->rx_packets += rpackets; 1073 tot->tx_packets += tpackets; 1074 tot->rx_bytes += rbytes; 1075 tot->tx_bytes += tbytes; 1076 } 1077 1078 tot->tx_dropped = dev->stats.tx_dropped; 1079 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1080 tot->rx_dropped = dev->stats.rx_dropped; 1081 tot->rx_length_errors = dev->stats.rx_length_errors; 1082 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1083 1084 return tot; 1085 } 1086 1087 #ifdef CONFIG_NET_POLL_CONTROLLER 1088 static void virtnet_netpoll(struct net_device *dev) 1089 { 1090 struct virtnet_info *vi = netdev_priv(dev); 1091 int i; 1092 1093 for (i = 0; i < vi->curr_queue_pairs; i++) 1094 napi_schedule(&vi->rq[i].napi); 1095 } 1096 #endif 1097 1098 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1099 { 1100 rtnl_lock(); 1101 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1102 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1103 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1104 rtnl_unlock(); 1105 } 1106 1107 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1108 { 1109 struct scatterlist sg; 1110 struct virtio_net_ctrl_mq s; 1111 struct net_device *dev = vi->dev; 1112 1113 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1114 return 0; 1115 1116 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1117 sg_init_one(&sg, &s, sizeof(s)); 1118 1119 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1120 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1121 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1122 queue_pairs); 1123 return -EINVAL; 1124 } else { 1125 vi->curr_queue_pairs = queue_pairs; 1126 /* virtnet_open() will refill when device is going to up. */ 1127 if (dev->flags & IFF_UP) 1128 schedule_delayed_work(&vi->refill, 0); 1129 } 1130 1131 return 0; 1132 } 1133 1134 static int virtnet_close(struct net_device *dev) 1135 { 1136 struct virtnet_info *vi = netdev_priv(dev); 1137 int i; 1138 1139 /* Make sure refill_work doesn't re-enable napi! */ 1140 cancel_delayed_work_sync(&vi->refill); 1141 1142 for (i = 0; i < vi->max_queue_pairs; i++) 1143 napi_disable(&vi->rq[i].napi); 1144 1145 return 0; 1146 } 1147 1148 static void virtnet_set_rx_mode(struct net_device *dev) 1149 { 1150 struct virtnet_info *vi = netdev_priv(dev); 1151 struct scatterlist sg[2]; 1152 u8 promisc, allmulti; 1153 struct virtio_net_ctrl_mac *mac_data; 1154 struct netdev_hw_addr *ha; 1155 int uc_count; 1156 int mc_count; 1157 void *buf; 1158 int i; 1159 1160 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1161 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1162 return; 1163 1164 promisc = ((dev->flags & IFF_PROMISC) != 0); 1165 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1166 1167 sg_init_one(sg, &promisc, sizeof(promisc)); 1168 1169 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1170 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1171 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1172 promisc ? "en" : "dis"); 1173 1174 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1175 1176 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1177 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1178 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1179 allmulti ? "en" : "dis"); 1180 1181 uc_count = netdev_uc_count(dev); 1182 mc_count = netdev_mc_count(dev); 1183 /* MAC filter - use one buffer for both lists */ 1184 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1185 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1186 mac_data = buf; 1187 if (!buf) 1188 return; 1189 1190 sg_init_table(sg, 2); 1191 1192 /* Store the unicast list and count in the front of the buffer */ 1193 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1194 i = 0; 1195 netdev_for_each_uc_addr(ha, dev) 1196 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1197 1198 sg_set_buf(&sg[0], mac_data, 1199 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1200 1201 /* multicast list and count fill the end */ 1202 mac_data = (void *)&mac_data->macs[uc_count][0]; 1203 1204 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1205 i = 0; 1206 netdev_for_each_mc_addr(ha, dev) 1207 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1208 1209 sg_set_buf(&sg[1], mac_data, 1210 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1211 1212 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1213 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1214 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1215 1216 kfree(buf); 1217 } 1218 1219 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1220 __be16 proto, u16 vid) 1221 { 1222 struct virtnet_info *vi = netdev_priv(dev); 1223 struct scatterlist sg; 1224 1225 sg_init_one(&sg, &vid, sizeof(vid)); 1226 1227 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1228 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1229 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1230 return 0; 1231 } 1232 1233 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1234 __be16 proto, u16 vid) 1235 { 1236 struct virtnet_info *vi = netdev_priv(dev); 1237 struct scatterlist sg; 1238 1239 sg_init_one(&sg, &vid, sizeof(vid)); 1240 1241 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1242 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1243 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1244 return 0; 1245 } 1246 1247 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1248 { 1249 int i; 1250 1251 if (vi->affinity_hint_set) { 1252 for (i = 0; i < vi->max_queue_pairs; i++) { 1253 virtqueue_set_affinity(vi->rq[i].vq, -1); 1254 virtqueue_set_affinity(vi->sq[i].vq, -1); 1255 } 1256 1257 vi->affinity_hint_set = false; 1258 } 1259 } 1260 1261 static void virtnet_set_affinity(struct virtnet_info *vi) 1262 { 1263 int i; 1264 int cpu; 1265 1266 /* In multiqueue mode, when the number of cpu is equal to the number of 1267 * queue pairs, we let the queue pairs to be private to one cpu by 1268 * setting the affinity hint to eliminate the contention. 1269 */ 1270 if (vi->curr_queue_pairs == 1 || 1271 vi->max_queue_pairs != num_online_cpus()) { 1272 virtnet_clean_affinity(vi, -1); 1273 return; 1274 } 1275 1276 i = 0; 1277 for_each_online_cpu(cpu) { 1278 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1279 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1280 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1281 i++; 1282 } 1283 1284 vi->affinity_hint_set = true; 1285 } 1286 1287 static int virtnet_cpu_callback(struct notifier_block *nfb, 1288 unsigned long action, void *hcpu) 1289 { 1290 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1291 1292 switch(action & ~CPU_TASKS_FROZEN) { 1293 case CPU_ONLINE: 1294 case CPU_DOWN_FAILED: 1295 case CPU_DEAD: 1296 virtnet_set_affinity(vi); 1297 break; 1298 case CPU_DOWN_PREPARE: 1299 virtnet_clean_affinity(vi, (long)hcpu); 1300 break; 1301 default: 1302 break; 1303 } 1304 1305 return NOTIFY_OK; 1306 } 1307 1308 static void virtnet_get_ringparam(struct net_device *dev, 1309 struct ethtool_ringparam *ring) 1310 { 1311 struct virtnet_info *vi = netdev_priv(dev); 1312 1313 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1314 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1315 ring->rx_pending = ring->rx_max_pending; 1316 ring->tx_pending = ring->tx_max_pending; 1317 } 1318 1319 1320 static void virtnet_get_drvinfo(struct net_device *dev, 1321 struct ethtool_drvinfo *info) 1322 { 1323 struct virtnet_info *vi = netdev_priv(dev); 1324 struct virtio_device *vdev = vi->vdev; 1325 1326 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1327 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1328 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1329 1330 } 1331 1332 /* TODO: Eliminate OOO packets during switching */ 1333 static int virtnet_set_channels(struct net_device *dev, 1334 struct ethtool_channels *channels) 1335 { 1336 struct virtnet_info *vi = netdev_priv(dev); 1337 u16 queue_pairs = channels->combined_count; 1338 int err; 1339 1340 /* We don't support separate rx/tx channels. 1341 * We don't allow setting 'other' channels. 1342 */ 1343 if (channels->rx_count || channels->tx_count || channels->other_count) 1344 return -EINVAL; 1345 1346 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1347 return -EINVAL; 1348 1349 get_online_cpus(); 1350 err = virtnet_set_queues(vi, queue_pairs); 1351 if (!err) { 1352 netif_set_real_num_tx_queues(dev, queue_pairs); 1353 netif_set_real_num_rx_queues(dev, queue_pairs); 1354 1355 virtnet_set_affinity(vi); 1356 } 1357 put_online_cpus(); 1358 1359 return err; 1360 } 1361 1362 static void virtnet_get_channels(struct net_device *dev, 1363 struct ethtool_channels *channels) 1364 { 1365 struct virtnet_info *vi = netdev_priv(dev); 1366 1367 channels->combined_count = vi->curr_queue_pairs; 1368 channels->max_combined = vi->max_queue_pairs; 1369 channels->max_other = 0; 1370 channels->rx_count = 0; 1371 channels->tx_count = 0; 1372 channels->other_count = 0; 1373 } 1374 1375 static const struct ethtool_ops virtnet_ethtool_ops = { 1376 .get_drvinfo = virtnet_get_drvinfo, 1377 .get_link = ethtool_op_get_link, 1378 .get_ringparam = virtnet_get_ringparam, 1379 .set_channels = virtnet_set_channels, 1380 .get_channels = virtnet_get_channels, 1381 }; 1382 1383 #define MIN_MTU 68 1384 #define MAX_MTU 65535 1385 1386 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1387 { 1388 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1389 return -EINVAL; 1390 dev->mtu = new_mtu; 1391 return 0; 1392 } 1393 1394 static const struct net_device_ops virtnet_netdev = { 1395 .ndo_open = virtnet_open, 1396 .ndo_stop = virtnet_close, 1397 .ndo_start_xmit = start_xmit, 1398 .ndo_validate_addr = eth_validate_addr, 1399 .ndo_set_mac_address = virtnet_set_mac_address, 1400 .ndo_set_rx_mode = virtnet_set_rx_mode, 1401 .ndo_change_mtu = virtnet_change_mtu, 1402 .ndo_get_stats64 = virtnet_stats, 1403 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1404 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1405 #ifdef CONFIG_NET_POLL_CONTROLLER 1406 .ndo_poll_controller = virtnet_netpoll, 1407 #endif 1408 #ifdef CONFIG_NET_RX_BUSY_POLL 1409 .ndo_busy_poll = virtnet_busy_poll, 1410 #endif 1411 }; 1412 1413 static void virtnet_config_changed_work(struct work_struct *work) 1414 { 1415 struct virtnet_info *vi = 1416 container_of(work, struct virtnet_info, config_work); 1417 u16 v; 1418 1419 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1420 struct virtio_net_config, status, &v) < 0) 1421 return; 1422 1423 if (v & VIRTIO_NET_S_ANNOUNCE) { 1424 netdev_notify_peers(vi->dev); 1425 virtnet_ack_link_announce(vi); 1426 } 1427 1428 /* Ignore unknown (future) status bits */ 1429 v &= VIRTIO_NET_S_LINK_UP; 1430 1431 if (vi->status == v) 1432 return; 1433 1434 vi->status = v; 1435 1436 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1437 netif_carrier_on(vi->dev); 1438 netif_tx_wake_all_queues(vi->dev); 1439 } else { 1440 netif_carrier_off(vi->dev); 1441 netif_tx_stop_all_queues(vi->dev); 1442 } 1443 } 1444 1445 static void virtnet_config_changed(struct virtio_device *vdev) 1446 { 1447 struct virtnet_info *vi = vdev->priv; 1448 1449 schedule_work(&vi->config_work); 1450 } 1451 1452 static void virtnet_free_queues(struct virtnet_info *vi) 1453 { 1454 int i; 1455 1456 for (i = 0; i < vi->max_queue_pairs; i++) 1457 netif_napi_del(&vi->rq[i].napi); 1458 1459 kfree(vi->rq); 1460 kfree(vi->sq); 1461 } 1462 1463 static void free_receive_bufs(struct virtnet_info *vi) 1464 { 1465 int i; 1466 1467 for (i = 0; i < vi->max_queue_pairs; i++) { 1468 while (vi->rq[i].pages) 1469 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1470 } 1471 } 1472 1473 static void free_receive_page_frags(struct virtnet_info *vi) 1474 { 1475 int i; 1476 for (i = 0; i < vi->max_queue_pairs; i++) 1477 if (vi->rq[i].alloc_frag.page) 1478 put_page(vi->rq[i].alloc_frag.page); 1479 } 1480 1481 static void free_unused_bufs(struct virtnet_info *vi) 1482 { 1483 void *buf; 1484 int i; 1485 1486 for (i = 0; i < vi->max_queue_pairs; i++) { 1487 struct virtqueue *vq = vi->sq[i].vq; 1488 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1489 dev_kfree_skb(buf); 1490 } 1491 1492 for (i = 0; i < vi->max_queue_pairs; i++) { 1493 struct virtqueue *vq = vi->rq[i].vq; 1494 1495 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1496 if (vi->mergeable_rx_bufs) { 1497 unsigned long ctx = (unsigned long)buf; 1498 void *base = mergeable_ctx_to_buf_address(ctx); 1499 put_page(virt_to_head_page(base)); 1500 } else if (vi->big_packets) { 1501 give_pages(&vi->rq[i], buf); 1502 } else { 1503 dev_kfree_skb(buf); 1504 } 1505 } 1506 } 1507 } 1508 1509 static void virtnet_del_vqs(struct virtnet_info *vi) 1510 { 1511 struct virtio_device *vdev = vi->vdev; 1512 1513 virtnet_clean_affinity(vi, -1); 1514 1515 vdev->config->del_vqs(vdev); 1516 1517 virtnet_free_queues(vi); 1518 } 1519 1520 static int virtnet_find_vqs(struct virtnet_info *vi) 1521 { 1522 vq_callback_t **callbacks; 1523 struct virtqueue **vqs; 1524 int ret = -ENOMEM; 1525 int i, total_vqs; 1526 const char **names; 1527 1528 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1529 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1530 * possible control vq. 1531 */ 1532 total_vqs = vi->max_queue_pairs * 2 + 1533 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1534 1535 /* Allocate space for find_vqs parameters */ 1536 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1537 if (!vqs) 1538 goto err_vq; 1539 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1540 if (!callbacks) 1541 goto err_callback; 1542 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1543 if (!names) 1544 goto err_names; 1545 1546 /* Parameters for control virtqueue, if any */ 1547 if (vi->has_cvq) { 1548 callbacks[total_vqs - 1] = NULL; 1549 names[total_vqs - 1] = "control"; 1550 } 1551 1552 /* Allocate/initialize parameters for send/receive virtqueues */ 1553 for (i = 0; i < vi->max_queue_pairs; i++) { 1554 callbacks[rxq2vq(i)] = skb_recv_done; 1555 callbacks[txq2vq(i)] = skb_xmit_done; 1556 sprintf(vi->rq[i].name, "input.%d", i); 1557 sprintf(vi->sq[i].name, "output.%d", i); 1558 names[rxq2vq(i)] = vi->rq[i].name; 1559 names[txq2vq(i)] = vi->sq[i].name; 1560 } 1561 1562 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1563 names); 1564 if (ret) 1565 goto err_find; 1566 1567 if (vi->has_cvq) { 1568 vi->cvq = vqs[total_vqs - 1]; 1569 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1570 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1571 } 1572 1573 for (i = 0; i < vi->max_queue_pairs; i++) { 1574 vi->rq[i].vq = vqs[rxq2vq(i)]; 1575 vi->sq[i].vq = vqs[txq2vq(i)]; 1576 } 1577 1578 kfree(names); 1579 kfree(callbacks); 1580 kfree(vqs); 1581 1582 return 0; 1583 1584 err_find: 1585 kfree(names); 1586 err_names: 1587 kfree(callbacks); 1588 err_callback: 1589 kfree(vqs); 1590 err_vq: 1591 return ret; 1592 } 1593 1594 static int virtnet_alloc_queues(struct virtnet_info *vi) 1595 { 1596 int i; 1597 1598 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1599 if (!vi->sq) 1600 goto err_sq; 1601 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1602 if (!vi->rq) 1603 goto err_rq; 1604 1605 INIT_DELAYED_WORK(&vi->refill, refill_work); 1606 for (i = 0; i < vi->max_queue_pairs; i++) { 1607 vi->rq[i].pages = NULL; 1608 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1609 napi_weight); 1610 napi_hash_add(&vi->rq[i].napi); 1611 1612 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1613 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1614 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1615 } 1616 1617 return 0; 1618 1619 err_rq: 1620 kfree(vi->sq); 1621 err_sq: 1622 return -ENOMEM; 1623 } 1624 1625 static int init_vqs(struct virtnet_info *vi) 1626 { 1627 int ret; 1628 1629 /* Allocate send & receive queues */ 1630 ret = virtnet_alloc_queues(vi); 1631 if (ret) 1632 goto err; 1633 1634 ret = virtnet_find_vqs(vi); 1635 if (ret) 1636 goto err_free; 1637 1638 get_online_cpus(); 1639 virtnet_set_affinity(vi); 1640 put_online_cpus(); 1641 1642 return 0; 1643 1644 err_free: 1645 virtnet_free_queues(vi); 1646 err: 1647 return ret; 1648 } 1649 1650 #ifdef CONFIG_SYSFS 1651 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1652 struct rx_queue_attribute *attribute, char *buf) 1653 { 1654 struct virtnet_info *vi = netdev_priv(queue->dev); 1655 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1656 struct ewma *avg; 1657 1658 BUG_ON(queue_index >= vi->max_queue_pairs); 1659 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1660 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1661 } 1662 1663 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1664 __ATTR_RO(mergeable_rx_buffer_size); 1665 1666 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1667 &mergeable_rx_buffer_size_attribute.attr, 1668 NULL 1669 }; 1670 1671 static const struct attribute_group virtio_net_mrg_rx_group = { 1672 .name = "virtio_net", 1673 .attrs = virtio_net_mrg_rx_attrs 1674 }; 1675 #endif 1676 1677 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 1678 unsigned int fbit, 1679 const char *fname, const char *dname) 1680 { 1681 if (!virtio_has_feature(vdev, fbit)) 1682 return false; 1683 1684 dev_err(&vdev->dev, "device advertises feature %s but not %s", 1685 fname, dname); 1686 1687 return true; 1688 } 1689 1690 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 1691 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 1692 1693 static bool virtnet_validate_features(struct virtio_device *vdev) 1694 { 1695 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 1696 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 1697 "VIRTIO_NET_F_CTRL_VQ") || 1698 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 1699 "VIRTIO_NET_F_CTRL_VQ") || 1700 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 1701 "VIRTIO_NET_F_CTRL_VQ") || 1702 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 1703 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 1704 "VIRTIO_NET_F_CTRL_VQ"))) { 1705 return false; 1706 } 1707 1708 return true; 1709 } 1710 1711 static int virtnet_probe(struct virtio_device *vdev) 1712 { 1713 int i, err; 1714 struct net_device *dev; 1715 struct virtnet_info *vi; 1716 u16 max_queue_pairs; 1717 1718 if (!virtnet_validate_features(vdev)) 1719 return -EINVAL; 1720 1721 /* Find if host supports multiqueue virtio_net device */ 1722 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1723 struct virtio_net_config, 1724 max_virtqueue_pairs, &max_queue_pairs); 1725 1726 /* We need at least 2 queue's */ 1727 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1728 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1729 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1730 max_queue_pairs = 1; 1731 1732 /* Allocate ourselves a network device with room for our info */ 1733 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1734 if (!dev) 1735 return -ENOMEM; 1736 1737 /* Set up network device as normal. */ 1738 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1739 dev->netdev_ops = &virtnet_netdev; 1740 dev->features = NETIF_F_HIGHDMA; 1741 1742 dev->ethtool_ops = &virtnet_ethtool_ops; 1743 SET_NETDEV_DEV(dev, &vdev->dev); 1744 1745 /* Do we support "hardware" checksums? */ 1746 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1747 /* This opens up the world of extra features. */ 1748 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1749 if (csum) 1750 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1751 1752 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1753 dev->hw_features |= NETIF_F_TSO 1754 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1755 } 1756 /* Individual feature bits: what can host handle? */ 1757 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1758 dev->hw_features |= NETIF_F_TSO; 1759 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1760 dev->hw_features |= NETIF_F_TSO6; 1761 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1762 dev->hw_features |= NETIF_F_TSO_ECN; 1763 1764 if (gso) 1765 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 1766 /* (!csum && gso) case will be fixed by register_netdev() */ 1767 } 1768 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1769 dev->features |= NETIF_F_RXCSUM; 1770 1771 dev->vlan_features = dev->features; 1772 1773 /* Configuration may specify what MAC to use. Otherwise random. */ 1774 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1775 virtio_cread_bytes(vdev, 1776 offsetof(struct virtio_net_config, mac), 1777 dev->dev_addr, dev->addr_len); 1778 else 1779 eth_hw_addr_random(dev); 1780 1781 /* Set up our device-specific information */ 1782 vi = netdev_priv(dev); 1783 vi->dev = dev; 1784 vi->vdev = vdev; 1785 vdev->priv = vi; 1786 vi->stats = alloc_percpu(struct virtnet_stats); 1787 err = -ENOMEM; 1788 if (vi->stats == NULL) 1789 goto free; 1790 1791 for_each_possible_cpu(i) { 1792 struct virtnet_stats *virtnet_stats; 1793 virtnet_stats = per_cpu_ptr(vi->stats, i); 1794 u64_stats_init(&virtnet_stats->tx_syncp); 1795 u64_stats_init(&virtnet_stats->rx_syncp); 1796 } 1797 1798 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1799 1800 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1801 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1802 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1803 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) 1804 vi->big_packets = true; 1805 1806 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1807 vi->mergeable_rx_bufs = true; 1808 1809 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 1810 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 1811 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1812 else 1813 vi->hdr_len = sizeof(struct virtio_net_hdr); 1814 1815 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1816 vi->any_header_sg = true; 1817 1818 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1819 vi->has_cvq = true; 1820 1821 if (vi->any_header_sg) 1822 dev->needed_headroom = vi->hdr_len; 1823 1824 /* Use single tx/rx queue pair as default */ 1825 vi->curr_queue_pairs = 1; 1826 vi->max_queue_pairs = max_queue_pairs; 1827 1828 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1829 err = init_vqs(vi); 1830 if (err) 1831 goto free_stats; 1832 1833 #ifdef CONFIG_SYSFS 1834 if (vi->mergeable_rx_bufs) 1835 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1836 #endif 1837 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1838 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1839 1840 err = register_netdev(dev); 1841 if (err) { 1842 pr_debug("virtio_net: registering device failed\n"); 1843 goto free_vqs; 1844 } 1845 1846 virtio_device_ready(vdev); 1847 1848 /* Last of all, set up some receive buffers. */ 1849 for (i = 0; i < vi->curr_queue_pairs; i++) { 1850 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); 1851 1852 /* If we didn't even get one input buffer, we're useless. */ 1853 if (vi->rq[i].vq->num_free == 1854 virtqueue_get_vring_size(vi->rq[i].vq)) { 1855 free_unused_bufs(vi); 1856 err = -ENOMEM; 1857 goto free_recv_bufs; 1858 } 1859 } 1860 1861 vi->nb.notifier_call = &virtnet_cpu_callback; 1862 err = register_hotcpu_notifier(&vi->nb); 1863 if (err) { 1864 pr_debug("virtio_net: registering cpu notifier failed\n"); 1865 goto free_recv_bufs; 1866 } 1867 1868 /* Assume link up if device can't report link status, 1869 otherwise get link status from config. */ 1870 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1871 netif_carrier_off(dev); 1872 schedule_work(&vi->config_work); 1873 } else { 1874 vi->status = VIRTIO_NET_S_LINK_UP; 1875 netif_carrier_on(dev); 1876 } 1877 1878 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1879 dev->name, max_queue_pairs); 1880 1881 return 0; 1882 1883 free_recv_bufs: 1884 vi->vdev->config->reset(vdev); 1885 1886 free_receive_bufs(vi); 1887 unregister_netdev(dev); 1888 free_vqs: 1889 cancel_delayed_work_sync(&vi->refill); 1890 free_receive_page_frags(vi); 1891 virtnet_del_vqs(vi); 1892 free_stats: 1893 free_percpu(vi->stats); 1894 free: 1895 free_netdev(dev); 1896 return err; 1897 } 1898 1899 static void remove_vq_common(struct virtnet_info *vi) 1900 { 1901 vi->vdev->config->reset(vi->vdev); 1902 1903 /* Free unused buffers in both send and recv, if any. */ 1904 free_unused_bufs(vi); 1905 1906 free_receive_bufs(vi); 1907 1908 free_receive_page_frags(vi); 1909 1910 virtnet_del_vqs(vi); 1911 } 1912 1913 static void virtnet_remove(struct virtio_device *vdev) 1914 { 1915 struct virtnet_info *vi = vdev->priv; 1916 1917 unregister_hotcpu_notifier(&vi->nb); 1918 1919 /* Make sure no work handler is accessing the device. */ 1920 flush_work(&vi->config_work); 1921 1922 unregister_netdev(vi->dev); 1923 1924 remove_vq_common(vi); 1925 1926 free_percpu(vi->stats); 1927 free_netdev(vi->dev); 1928 } 1929 1930 #ifdef CONFIG_PM_SLEEP 1931 static int virtnet_freeze(struct virtio_device *vdev) 1932 { 1933 struct virtnet_info *vi = vdev->priv; 1934 int i; 1935 1936 unregister_hotcpu_notifier(&vi->nb); 1937 1938 /* Make sure no work handler is accessing the device */ 1939 flush_work(&vi->config_work); 1940 1941 netif_device_detach(vi->dev); 1942 cancel_delayed_work_sync(&vi->refill); 1943 1944 if (netif_running(vi->dev)) { 1945 for (i = 0; i < vi->max_queue_pairs; i++) { 1946 napi_disable(&vi->rq[i].napi); 1947 napi_hash_del(&vi->rq[i].napi); 1948 netif_napi_del(&vi->rq[i].napi); 1949 } 1950 } 1951 1952 remove_vq_common(vi); 1953 1954 return 0; 1955 } 1956 1957 static int virtnet_restore(struct virtio_device *vdev) 1958 { 1959 struct virtnet_info *vi = vdev->priv; 1960 int err, i; 1961 1962 err = init_vqs(vi); 1963 if (err) 1964 return err; 1965 1966 virtio_device_ready(vdev); 1967 1968 if (netif_running(vi->dev)) { 1969 for (i = 0; i < vi->curr_queue_pairs; i++) 1970 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1971 schedule_delayed_work(&vi->refill, 0); 1972 1973 for (i = 0; i < vi->max_queue_pairs; i++) 1974 virtnet_napi_enable(&vi->rq[i]); 1975 } 1976 1977 netif_device_attach(vi->dev); 1978 1979 rtnl_lock(); 1980 virtnet_set_queues(vi, vi->curr_queue_pairs); 1981 rtnl_unlock(); 1982 1983 err = register_hotcpu_notifier(&vi->nb); 1984 if (err) 1985 return err; 1986 1987 return 0; 1988 } 1989 #endif 1990 1991 static struct virtio_device_id id_table[] = { 1992 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1993 { 0 }, 1994 }; 1995 1996 static unsigned int features[] = { 1997 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1998 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1999 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_TSO6, 2000 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 2001 VIRTIO_NET_F_GUEST_ECN, 2002 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 2003 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 2004 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 2005 VIRTIO_NET_F_CTRL_MAC_ADDR, 2006 VIRTIO_F_ANY_LAYOUT, 2007 }; 2008 2009 static struct virtio_driver virtio_net_driver = { 2010 .feature_table = features, 2011 .feature_table_size = ARRAY_SIZE(features), 2012 .driver.name = KBUILD_MODNAME, 2013 .driver.owner = THIS_MODULE, 2014 .id_table = id_table, 2015 .probe = virtnet_probe, 2016 .remove = virtnet_remove, 2017 .config_changed = virtnet_config_changed, 2018 #ifdef CONFIG_PM_SLEEP 2019 .freeze = virtnet_freeze, 2020 .restore = virtnet_restore, 2021 #endif 2022 }; 2023 2024 module_virtio_driver(virtio_net_driver); 2025 2026 MODULE_DEVICE_TABLE(virtio, id_table); 2027 MODULE_DESCRIPTION("Virtio network driver"); 2028 MODULE_LICENSE("GPL"); 2029