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 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 } 774 } 775 776 return received; 777 } 778 779 #ifdef CONFIG_NET_RX_BUSY_POLL 780 /* must be called with local_bh_disable()d */ 781 static int virtnet_busy_poll(struct napi_struct *napi) 782 { 783 struct receive_queue *rq = 784 container_of(napi, struct receive_queue, napi); 785 struct virtnet_info *vi = rq->vq->vdev->priv; 786 int r, received = 0, budget = 4; 787 788 if (!(vi->status & VIRTIO_NET_S_LINK_UP)) 789 return LL_FLUSH_FAILED; 790 791 if (!napi_schedule_prep(napi)) 792 return LL_FLUSH_BUSY; 793 794 virtqueue_disable_cb(rq->vq); 795 796 again: 797 received += virtnet_receive(rq, budget); 798 799 r = virtqueue_enable_cb_prepare(rq->vq); 800 clear_bit(NAPI_STATE_SCHED, &napi->state); 801 if (unlikely(virtqueue_poll(rq->vq, r)) && 802 napi_schedule_prep(napi)) { 803 virtqueue_disable_cb(rq->vq); 804 if (received < budget) { 805 budget -= received; 806 goto again; 807 } else { 808 __napi_schedule(napi); 809 } 810 } 811 812 return received; 813 } 814 #endif /* CONFIG_NET_RX_BUSY_POLL */ 815 816 static int virtnet_open(struct net_device *dev) 817 { 818 struct virtnet_info *vi = netdev_priv(dev); 819 int i; 820 821 for (i = 0; i < vi->max_queue_pairs; i++) { 822 if (i < vi->curr_queue_pairs) 823 /* Make sure we have some buffers: if oom use wq. */ 824 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 825 schedule_delayed_work(&vi->refill, 0); 826 virtnet_napi_enable(&vi->rq[i]); 827 } 828 829 return 0; 830 } 831 832 static void free_old_xmit_skbs(struct send_queue *sq) 833 { 834 struct sk_buff *skb; 835 unsigned int len; 836 struct virtnet_info *vi = sq->vq->vdev->priv; 837 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 838 839 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 840 pr_debug("Sent skb %p\n", skb); 841 842 u64_stats_update_begin(&stats->tx_syncp); 843 stats->tx_bytes += skb->len; 844 stats->tx_packets++; 845 u64_stats_update_end(&stats->tx_syncp); 846 847 dev_kfree_skb_any(skb); 848 } 849 } 850 851 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 852 { 853 struct virtio_net_hdr_mrg_rxbuf *hdr; 854 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 855 struct virtnet_info *vi = sq->vq->vdev->priv; 856 unsigned num_sg; 857 unsigned hdr_len = vi->hdr_len; 858 bool can_push; 859 860 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 861 862 can_push = vi->any_header_sg && 863 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 864 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 865 /* Even if we can, don't push here yet as this would skew 866 * csum_start offset below. */ 867 if (can_push) 868 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 869 else 870 hdr = skb_vnet_hdr(skb); 871 872 if (skb->ip_summed == CHECKSUM_PARTIAL) { 873 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 874 hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev, 875 skb_checksum_start_offset(skb)); 876 hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev, 877 skb->csum_offset); 878 } else { 879 hdr->hdr.flags = 0; 880 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 881 } 882 883 if (skb_is_gso(skb)) { 884 hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb)); 885 hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev, 886 skb_shinfo(skb)->gso_size); 887 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 888 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 889 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 890 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 891 else 892 BUG(); 893 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 894 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 895 } else { 896 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 897 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 898 } 899 900 if (vi->mergeable_rx_bufs) 901 hdr->num_buffers = 0; 902 903 sg_init_table(sq->sg, MAX_SKB_FRAGS + 2); 904 if (can_push) { 905 __skb_push(skb, hdr_len); 906 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 907 /* Pull header back to avoid skew in tx bytes calculations. */ 908 __skb_pull(skb, hdr_len); 909 } else { 910 sg_set_buf(sq->sg, hdr, hdr_len); 911 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; 912 } 913 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 914 } 915 916 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 917 { 918 struct virtnet_info *vi = netdev_priv(dev); 919 int qnum = skb_get_queue_mapping(skb); 920 struct send_queue *sq = &vi->sq[qnum]; 921 int err; 922 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 923 bool kick = !skb->xmit_more; 924 925 /* Free up any pending old buffers before queueing new ones. */ 926 free_old_xmit_skbs(sq); 927 928 /* Try to transmit */ 929 err = xmit_skb(sq, skb); 930 931 /* This should not happen! */ 932 if (unlikely(err)) { 933 dev->stats.tx_fifo_errors++; 934 if (net_ratelimit()) 935 dev_warn(&dev->dev, 936 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 937 dev->stats.tx_dropped++; 938 dev_kfree_skb_any(skb); 939 return NETDEV_TX_OK; 940 } 941 942 /* Don't wait up for transmitted skbs to be freed. */ 943 skb_orphan(skb); 944 nf_reset(skb); 945 946 /* Apparently nice girls don't return TX_BUSY; stop the queue 947 * before it gets out of hand. Naturally, this wastes entries. */ 948 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 949 netif_stop_subqueue(dev, qnum); 950 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 951 /* More just got used, free them then recheck. */ 952 free_old_xmit_skbs(sq); 953 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 954 netif_start_subqueue(dev, qnum); 955 virtqueue_disable_cb(sq->vq); 956 } 957 } 958 } 959 960 if (kick || netif_xmit_stopped(txq)) 961 virtqueue_kick(sq->vq); 962 963 return NETDEV_TX_OK; 964 } 965 966 /* 967 * Send command via the control virtqueue and check status. Commands 968 * supported by the hypervisor, as indicated by feature bits, should 969 * never fail unless improperly formatted. 970 */ 971 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 972 struct scatterlist *out) 973 { 974 struct scatterlist *sgs[4], hdr, stat; 975 struct virtio_net_ctrl_hdr ctrl; 976 virtio_net_ctrl_ack status = ~0; 977 unsigned out_num = 0, tmp; 978 979 /* Caller should know better */ 980 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 981 982 ctrl.class = class; 983 ctrl.cmd = cmd; 984 /* Add header */ 985 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 986 sgs[out_num++] = &hdr; 987 988 if (out) 989 sgs[out_num++] = out; 990 991 /* Add return status. */ 992 sg_init_one(&stat, &status, sizeof(status)); 993 sgs[out_num] = &stat; 994 995 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 996 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 997 998 if (unlikely(!virtqueue_kick(vi->cvq))) 999 return status == VIRTIO_NET_OK; 1000 1001 /* Spin for a response, the kick causes an ioport write, trapping 1002 * into the hypervisor, so the request should be handled immediately. 1003 */ 1004 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1005 !virtqueue_is_broken(vi->cvq)) 1006 cpu_relax(); 1007 1008 return status == VIRTIO_NET_OK; 1009 } 1010 1011 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1012 { 1013 struct virtnet_info *vi = netdev_priv(dev); 1014 struct virtio_device *vdev = vi->vdev; 1015 int ret; 1016 struct sockaddr *addr = p; 1017 struct scatterlist sg; 1018 1019 ret = eth_prepare_mac_addr_change(dev, p); 1020 if (ret) 1021 return ret; 1022 1023 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1024 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1025 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1026 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1027 dev_warn(&vdev->dev, 1028 "Failed to set mac address by vq command.\n"); 1029 return -EINVAL; 1030 } 1031 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1032 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1033 unsigned int i; 1034 1035 /* Naturally, this has an atomicity problem. */ 1036 for (i = 0; i < dev->addr_len; i++) 1037 virtio_cwrite8(vdev, 1038 offsetof(struct virtio_net_config, mac) + 1039 i, addr->sa_data[i]); 1040 } 1041 1042 eth_commit_mac_addr_change(dev, p); 1043 1044 return 0; 1045 } 1046 1047 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1048 struct rtnl_link_stats64 *tot) 1049 { 1050 struct virtnet_info *vi = netdev_priv(dev); 1051 int cpu; 1052 unsigned int start; 1053 1054 for_each_possible_cpu(cpu) { 1055 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1056 u64 tpackets, tbytes, rpackets, rbytes; 1057 1058 do { 1059 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1060 tpackets = stats->tx_packets; 1061 tbytes = stats->tx_bytes; 1062 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1063 1064 do { 1065 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1066 rpackets = stats->rx_packets; 1067 rbytes = stats->rx_bytes; 1068 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1069 1070 tot->rx_packets += rpackets; 1071 tot->tx_packets += tpackets; 1072 tot->rx_bytes += rbytes; 1073 tot->tx_bytes += tbytes; 1074 } 1075 1076 tot->tx_dropped = dev->stats.tx_dropped; 1077 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1078 tot->rx_dropped = dev->stats.rx_dropped; 1079 tot->rx_length_errors = dev->stats.rx_length_errors; 1080 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1081 1082 return tot; 1083 } 1084 1085 #ifdef CONFIG_NET_POLL_CONTROLLER 1086 static void virtnet_netpoll(struct net_device *dev) 1087 { 1088 struct virtnet_info *vi = netdev_priv(dev); 1089 int i; 1090 1091 for (i = 0; i < vi->curr_queue_pairs; i++) 1092 napi_schedule(&vi->rq[i].napi); 1093 } 1094 #endif 1095 1096 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1097 { 1098 rtnl_lock(); 1099 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1100 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1101 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1102 rtnl_unlock(); 1103 } 1104 1105 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1106 { 1107 struct scatterlist sg; 1108 struct virtio_net_ctrl_mq s; 1109 struct net_device *dev = vi->dev; 1110 1111 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1112 return 0; 1113 1114 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1115 sg_init_one(&sg, &s, sizeof(s)); 1116 1117 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1118 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1119 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1120 queue_pairs); 1121 return -EINVAL; 1122 } else { 1123 vi->curr_queue_pairs = queue_pairs; 1124 /* virtnet_open() will refill when device is going to up. */ 1125 if (dev->flags & IFF_UP) 1126 schedule_delayed_work(&vi->refill, 0); 1127 } 1128 1129 return 0; 1130 } 1131 1132 static int virtnet_close(struct net_device *dev) 1133 { 1134 struct virtnet_info *vi = netdev_priv(dev); 1135 int i; 1136 1137 /* Make sure refill_work doesn't re-enable napi! */ 1138 cancel_delayed_work_sync(&vi->refill); 1139 1140 for (i = 0; i < vi->max_queue_pairs; i++) 1141 napi_disable(&vi->rq[i].napi); 1142 1143 return 0; 1144 } 1145 1146 static void virtnet_set_rx_mode(struct net_device *dev) 1147 { 1148 struct virtnet_info *vi = netdev_priv(dev); 1149 struct scatterlist sg[2]; 1150 u8 promisc, allmulti; 1151 struct virtio_net_ctrl_mac *mac_data; 1152 struct netdev_hw_addr *ha; 1153 int uc_count; 1154 int mc_count; 1155 void *buf; 1156 int i; 1157 1158 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1159 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1160 return; 1161 1162 promisc = ((dev->flags & IFF_PROMISC) != 0); 1163 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1164 1165 sg_init_one(sg, &promisc, sizeof(promisc)); 1166 1167 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1168 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1169 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1170 promisc ? "en" : "dis"); 1171 1172 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1173 1174 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1175 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1176 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1177 allmulti ? "en" : "dis"); 1178 1179 uc_count = netdev_uc_count(dev); 1180 mc_count = netdev_mc_count(dev); 1181 /* MAC filter - use one buffer for both lists */ 1182 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1183 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1184 mac_data = buf; 1185 if (!buf) 1186 return; 1187 1188 sg_init_table(sg, 2); 1189 1190 /* Store the unicast list and count in the front of the buffer */ 1191 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1192 i = 0; 1193 netdev_for_each_uc_addr(ha, dev) 1194 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1195 1196 sg_set_buf(&sg[0], mac_data, 1197 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1198 1199 /* multicast list and count fill the end */ 1200 mac_data = (void *)&mac_data->macs[uc_count][0]; 1201 1202 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1203 i = 0; 1204 netdev_for_each_mc_addr(ha, dev) 1205 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1206 1207 sg_set_buf(&sg[1], mac_data, 1208 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1209 1210 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1211 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1212 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1213 1214 kfree(buf); 1215 } 1216 1217 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1218 __be16 proto, u16 vid) 1219 { 1220 struct virtnet_info *vi = netdev_priv(dev); 1221 struct scatterlist sg; 1222 1223 sg_init_one(&sg, &vid, sizeof(vid)); 1224 1225 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1226 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1227 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1228 return 0; 1229 } 1230 1231 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1232 __be16 proto, u16 vid) 1233 { 1234 struct virtnet_info *vi = netdev_priv(dev); 1235 struct scatterlist sg; 1236 1237 sg_init_one(&sg, &vid, sizeof(vid)); 1238 1239 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1240 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1241 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1242 return 0; 1243 } 1244 1245 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1246 { 1247 int i; 1248 1249 if (vi->affinity_hint_set) { 1250 for (i = 0; i < vi->max_queue_pairs; i++) { 1251 virtqueue_set_affinity(vi->rq[i].vq, -1); 1252 virtqueue_set_affinity(vi->sq[i].vq, -1); 1253 } 1254 1255 vi->affinity_hint_set = false; 1256 } 1257 } 1258 1259 static void virtnet_set_affinity(struct virtnet_info *vi) 1260 { 1261 int i; 1262 int cpu; 1263 1264 /* In multiqueue mode, when the number of cpu is equal to the number of 1265 * queue pairs, we let the queue pairs to be private to one cpu by 1266 * setting the affinity hint to eliminate the contention. 1267 */ 1268 if (vi->curr_queue_pairs == 1 || 1269 vi->max_queue_pairs != num_online_cpus()) { 1270 virtnet_clean_affinity(vi, -1); 1271 return; 1272 } 1273 1274 i = 0; 1275 for_each_online_cpu(cpu) { 1276 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1277 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1278 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1279 i++; 1280 } 1281 1282 vi->affinity_hint_set = true; 1283 } 1284 1285 static int virtnet_cpu_callback(struct notifier_block *nfb, 1286 unsigned long action, void *hcpu) 1287 { 1288 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1289 1290 switch(action & ~CPU_TASKS_FROZEN) { 1291 case CPU_ONLINE: 1292 case CPU_DOWN_FAILED: 1293 case CPU_DEAD: 1294 virtnet_set_affinity(vi); 1295 break; 1296 case CPU_DOWN_PREPARE: 1297 virtnet_clean_affinity(vi, (long)hcpu); 1298 break; 1299 default: 1300 break; 1301 } 1302 1303 return NOTIFY_OK; 1304 } 1305 1306 static void virtnet_get_ringparam(struct net_device *dev, 1307 struct ethtool_ringparam *ring) 1308 { 1309 struct virtnet_info *vi = netdev_priv(dev); 1310 1311 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1312 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1313 ring->rx_pending = ring->rx_max_pending; 1314 ring->tx_pending = ring->tx_max_pending; 1315 } 1316 1317 1318 static void virtnet_get_drvinfo(struct net_device *dev, 1319 struct ethtool_drvinfo *info) 1320 { 1321 struct virtnet_info *vi = netdev_priv(dev); 1322 struct virtio_device *vdev = vi->vdev; 1323 1324 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1325 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1326 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1327 1328 } 1329 1330 /* TODO: Eliminate OOO packets during switching */ 1331 static int virtnet_set_channels(struct net_device *dev, 1332 struct ethtool_channels *channels) 1333 { 1334 struct virtnet_info *vi = netdev_priv(dev); 1335 u16 queue_pairs = channels->combined_count; 1336 int err; 1337 1338 /* We don't support separate rx/tx channels. 1339 * We don't allow setting 'other' channels. 1340 */ 1341 if (channels->rx_count || channels->tx_count || channels->other_count) 1342 return -EINVAL; 1343 1344 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1345 return -EINVAL; 1346 1347 get_online_cpus(); 1348 err = virtnet_set_queues(vi, queue_pairs); 1349 if (!err) { 1350 netif_set_real_num_tx_queues(dev, queue_pairs); 1351 netif_set_real_num_rx_queues(dev, queue_pairs); 1352 1353 virtnet_set_affinity(vi); 1354 } 1355 put_online_cpus(); 1356 1357 return err; 1358 } 1359 1360 static void virtnet_get_channels(struct net_device *dev, 1361 struct ethtool_channels *channels) 1362 { 1363 struct virtnet_info *vi = netdev_priv(dev); 1364 1365 channels->combined_count = vi->curr_queue_pairs; 1366 channels->max_combined = vi->max_queue_pairs; 1367 channels->max_other = 0; 1368 channels->rx_count = 0; 1369 channels->tx_count = 0; 1370 channels->other_count = 0; 1371 } 1372 1373 static const struct ethtool_ops virtnet_ethtool_ops = { 1374 .get_drvinfo = virtnet_get_drvinfo, 1375 .get_link = ethtool_op_get_link, 1376 .get_ringparam = virtnet_get_ringparam, 1377 .set_channels = virtnet_set_channels, 1378 .get_channels = virtnet_get_channels, 1379 }; 1380 1381 #define MIN_MTU 68 1382 #define MAX_MTU 65535 1383 1384 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1385 { 1386 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1387 return -EINVAL; 1388 dev->mtu = new_mtu; 1389 return 0; 1390 } 1391 1392 static const struct net_device_ops virtnet_netdev = { 1393 .ndo_open = virtnet_open, 1394 .ndo_stop = virtnet_close, 1395 .ndo_start_xmit = start_xmit, 1396 .ndo_validate_addr = eth_validate_addr, 1397 .ndo_set_mac_address = virtnet_set_mac_address, 1398 .ndo_set_rx_mode = virtnet_set_rx_mode, 1399 .ndo_change_mtu = virtnet_change_mtu, 1400 .ndo_get_stats64 = virtnet_stats, 1401 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1402 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1403 #ifdef CONFIG_NET_POLL_CONTROLLER 1404 .ndo_poll_controller = virtnet_netpoll, 1405 #endif 1406 #ifdef CONFIG_NET_RX_BUSY_POLL 1407 .ndo_busy_poll = virtnet_busy_poll, 1408 #endif 1409 }; 1410 1411 static void virtnet_config_changed_work(struct work_struct *work) 1412 { 1413 struct virtnet_info *vi = 1414 container_of(work, struct virtnet_info, config_work); 1415 u16 v; 1416 1417 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1418 struct virtio_net_config, status, &v) < 0) 1419 return; 1420 1421 if (v & VIRTIO_NET_S_ANNOUNCE) { 1422 netdev_notify_peers(vi->dev); 1423 virtnet_ack_link_announce(vi); 1424 } 1425 1426 /* Ignore unknown (future) status bits */ 1427 v &= VIRTIO_NET_S_LINK_UP; 1428 1429 if (vi->status == v) 1430 return; 1431 1432 vi->status = v; 1433 1434 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1435 netif_carrier_on(vi->dev); 1436 netif_tx_wake_all_queues(vi->dev); 1437 } else { 1438 netif_carrier_off(vi->dev); 1439 netif_tx_stop_all_queues(vi->dev); 1440 } 1441 } 1442 1443 static void virtnet_config_changed(struct virtio_device *vdev) 1444 { 1445 struct virtnet_info *vi = vdev->priv; 1446 1447 schedule_work(&vi->config_work); 1448 } 1449 1450 static void virtnet_free_queues(struct virtnet_info *vi) 1451 { 1452 int i; 1453 1454 for (i = 0; i < vi->max_queue_pairs; i++) 1455 netif_napi_del(&vi->rq[i].napi); 1456 1457 kfree(vi->rq); 1458 kfree(vi->sq); 1459 } 1460 1461 static void free_receive_bufs(struct virtnet_info *vi) 1462 { 1463 int i; 1464 1465 for (i = 0; i < vi->max_queue_pairs; i++) { 1466 while (vi->rq[i].pages) 1467 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1468 } 1469 } 1470 1471 static void free_receive_page_frags(struct virtnet_info *vi) 1472 { 1473 int i; 1474 for (i = 0; i < vi->max_queue_pairs; i++) 1475 if (vi->rq[i].alloc_frag.page) 1476 put_page(vi->rq[i].alloc_frag.page); 1477 } 1478 1479 static void free_unused_bufs(struct virtnet_info *vi) 1480 { 1481 void *buf; 1482 int i; 1483 1484 for (i = 0; i < vi->max_queue_pairs; i++) { 1485 struct virtqueue *vq = vi->sq[i].vq; 1486 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1487 dev_kfree_skb(buf); 1488 } 1489 1490 for (i = 0; i < vi->max_queue_pairs; i++) { 1491 struct virtqueue *vq = vi->rq[i].vq; 1492 1493 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1494 if (vi->mergeable_rx_bufs) { 1495 unsigned long ctx = (unsigned long)buf; 1496 void *base = mergeable_ctx_to_buf_address(ctx); 1497 put_page(virt_to_head_page(base)); 1498 } else if (vi->big_packets) { 1499 give_pages(&vi->rq[i], buf); 1500 } else { 1501 dev_kfree_skb(buf); 1502 } 1503 } 1504 } 1505 } 1506 1507 static void virtnet_del_vqs(struct virtnet_info *vi) 1508 { 1509 struct virtio_device *vdev = vi->vdev; 1510 1511 virtnet_clean_affinity(vi, -1); 1512 1513 vdev->config->del_vqs(vdev); 1514 1515 virtnet_free_queues(vi); 1516 } 1517 1518 static int virtnet_find_vqs(struct virtnet_info *vi) 1519 { 1520 vq_callback_t **callbacks; 1521 struct virtqueue **vqs; 1522 int ret = -ENOMEM; 1523 int i, total_vqs; 1524 const char **names; 1525 1526 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1527 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1528 * possible control vq. 1529 */ 1530 total_vqs = vi->max_queue_pairs * 2 + 1531 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1532 1533 /* Allocate space for find_vqs parameters */ 1534 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1535 if (!vqs) 1536 goto err_vq; 1537 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1538 if (!callbacks) 1539 goto err_callback; 1540 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1541 if (!names) 1542 goto err_names; 1543 1544 /* Parameters for control virtqueue, if any */ 1545 if (vi->has_cvq) { 1546 callbacks[total_vqs - 1] = NULL; 1547 names[total_vqs - 1] = "control"; 1548 } 1549 1550 /* Allocate/initialize parameters for send/receive virtqueues */ 1551 for (i = 0; i < vi->max_queue_pairs; i++) { 1552 callbacks[rxq2vq(i)] = skb_recv_done; 1553 callbacks[txq2vq(i)] = skb_xmit_done; 1554 sprintf(vi->rq[i].name, "input.%d", i); 1555 sprintf(vi->sq[i].name, "output.%d", i); 1556 names[rxq2vq(i)] = vi->rq[i].name; 1557 names[txq2vq(i)] = vi->sq[i].name; 1558 } 1559 1560 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1561 names); 1562 if (ret) 1563 goto err_find; 1564 1565 if (vi->has_cvq) { 1566 vi->cvq = vqs[total_vqs - 1]; 1567 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1568 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1569 } 1570 1571 for (i = 0; i < vi->max_queue_pairs; i++) { 1572 vi->rq[i].vq = vqs[rxq2vq(i)]; 1573 vi->sq[i].vq = vqs[txq2vq(i)]; 1574 } 1575 1576 kfree(names); 1577 kfree(callbacks); 1578 kfree(vqs); 1579 1580 return 0; 1581 1582 err_find: 1583 kfree(names); 1584 err_names: 1585 kfree(callbacks); 1586 err_callback: 1587 kfree(vqs); 1588 err_vq: 1589 return ret; 1590 } 1591 1592 static int virtnet_alloc_queues(struct virtnet_info *vi) 1593 { 1594 int i; 1595 1596 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1597 if (!vi->sq) 1598 goto err_sq; 1599 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1600 if (!vi->rq) 1601 goto err_rq; 1602 1603 INIT_DELAYED_WORK(&vi->refill, refill_work); 1604 for (i = 0; i < vi->max_queue_pairs; i++) { 1605 vi->rq[i].pages = NULL; 1606 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1607 napi_weight); 1608 napi_hash_add(&vi->rq[i].napi); 1609 1610 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1611 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1612 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1613 } 1614 1615 return 0; 1616 1617 err_rq: 1618 kfree(vi->sq); 1619 err_sq: 1620 return -ENOMEM; 1621 } 1622 1623 static int init_vqs(struct virtnet_info *vi) 1624 { 1625 int ret; 1626 1627 /* Allocate send & receive queues */ 1628 ret = virtnet_alloc_queues(vi); 1629 if (ret) 1630 goto err; 1631 1632 ret = virtnet_find_vqs(vi); 1633 if (ret) 1634 goto err_free; 1635 1636 get_online_cpus(); 1637 virtnet_set_affinity(vi); 1638 put_online_cpus(); 1639 1640 return 0; 1641 1642 err_free: 1643 virtnet_free_queues(vi); 1644 err: 1645 return ret; 1646 } 1647 1648 #ifdef CONFIG_SYSFS 1649 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1650 struct rx_queue_attribute *attribute, char *buf) 1651 { 1652 struct virtnet_info *vi = netdev_priv(queue->dev); 1653 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1654 struct ewma *avg; 1655 1656 BUG_ON(queue_index >= vi->max_queue_pairs); 1657 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1658 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1659 } 1660 1661 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1662 __ATTR_RO(mergeable_rx_buffer_size); 1663 1664 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1665 &mergeable_rx_buffer_size_attribute.attr, 1666 NULL 1667 }; 1668 1669 static const struct attribute_group virtio_net_mrg_rx_group = { 1670 .name = "virtio_net", 1671 .attrs = virtio_net_mrg_rx_attrs 1672 }; 1673 #endif 1674 1675 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 1676 unsigned int fbit, 1677 const char *fname, const char *dname) 1678 { 1679 if (!virtio_has_feature(vdev, fbit)) 1680 return false; 1681 1682 dev_err(&vdev->dev, "device advertises feature %s but not %s", 1683 fname, dname); 1684 1685 return true; 1686 } 1687 1688 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 1689 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 1690 1691 static bool virtnet_validate_features(struct virtio_device *vdev) 1692 { 1693 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 1694 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 1695 "VIRTIO_NET_F_CTRL_VQ") || 1696 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 1697 "VIRTIO_NET_F_CTRL_VQ") || 1698 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 1699 "VIRTIO_NET_F_CTRL_VQ") || 1700 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 1701 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 1702 "VIRTIO_NET_F_CTRL_VQ"))) { 1703 return false; 1704 } 1705 1706 return true; 1707 } 1708 1709 static int virtnet_probe(struct virtio_device *vdev) 1710 { 1711 int i, err; 1712 struct net_device *dev; 1713 struct virtnet_info *vi; 1714 u16 max_queue_pairs; 1715 1716 if (!virtnet_validate_features(vdev)) 1717 return -EINVAL; 1718 1719 /* Find if host supports multiqueue virtio_net device */ 1720 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1721 struct virtio_net_config, 1722 max_virtqueue_pairs, &max_queue_pairs); 1723 1724 /* We need at least 2 queue's */ 1725 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1726 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1727 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1728 max_queue_pairs = 1; 1729 1730 /* Allocate ourselves a network device with room for our info */ 1731 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1732 if (!dev) 1733 return -ENOMEM; 1734 1735 /* Set up network device as normal. */ 1736 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1737 dev->netdev_ops = &virtnet_netdev; 1738 dev->features = NETIF_F_HIGHDMA; 1739 1740 dev->ethtool_ops = &virtnet_ethtool_ops; 1741 SET_NETDEV_DEV(dev, &vdev->dev); 1742 1743 /* Do we support "hardware" checksums? */ 1744 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1745 /* This opens up the world of extra features. */ 1746 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1747 if (csum) 1748 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1749 1750 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1751 dev->hw_features |= NETIF_F_TSO 1752 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1753 } 1754 /* Individual feature bits: what can host handle? */ 1755 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1756 dev->hw_features |= NETIF_F_TSO; 1757 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1758 dev->hw_features |= NETIF_F_TSO6; 1759 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1760 dev->hw_features |= NETIF_F_TSO_ECN; 1761 1762 if (gso) 1763 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 1764 /* (!csum && gso) case will be fixed by register_netdev() */ 1765 } 1766 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1767 dev->features |= NETIF_F_RXCSUM; 1768 1769 dev->vlan_features = dev->features; 1770 1771 /* Configuration may specify what MAC to use. Otherwise random. */ 1772 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1773 virtio_cread_bytes(vdev, 1774 offsetof(struct virtio_net_config, mac), 1775 dev->dev_addr, dev->addr_len); 1776 else 1777 eth_hw_addr_random(dev); 1778 1779 /* Set up our device-specific information */ 1780 vi = netdev_priv(dev); 1781 vi->dev = dev; 1782 vi->vdev = vdev; 1783 vdev->priv = vi; 1784 vi->stats = alloc_percpu(struct virtnet_stats); 1785 err = -ENOMEM; 1786 if (vi->stats == NULL) 1787 goto free; 1788 1789 for_each_possible_cpu(i) { 1790 struct virtnet_stats *virtnet_stats; 1791 virtnet_stats = per_cpu_ptr(vi->stats, i); 1792 u64_stats_init(&virtnet_stats->tx_syncp); 1793 u64_stats_init(&virtnet_stats->rx_syncp); 1794 } 1795 1796 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1797 1798 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1799 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1800 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1801 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN)) 1802 vi->big_packets = true; 1803 1804 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1805 vi->mergeable_rx_bufs = true; 1806 1807 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 1808 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 1809 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1810 else 1811 vi->hdr_len = sizeof(struct virtio_net_hdr); 1812 1813 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1814 vi->any_header_sg = true; 1815 1816 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1817 vi->has_cvq = true; 1818 1819 if (vi->any_header_sg) 1820 dev->needed_headroom = vi->hdr_len; 1821 1822 /* Use single tx/rx queue pair as default */ 1823 vi->curr_queue_pairs = 1; 1824 vi->max_queue_pairs = max_queue_pairs; 1825 1826 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1827 err = init_vqs(vi); 1828 if (err) 1829 goto free_stats; 1830 1831 #ifdef CONFIG_SYSFS 1832 if (vi->mergeable_rx_bufs) 1833 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1834 #endif 1835 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1836 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1837 1838 err = register_netdev(dev); 1839 if (err) { 1840 pr_debug("virtio_net: registering device failed\n"); 1841 goto free_vqs; 1842 } 1843 1844 virtio_device_ready(vdev); 1845 1846 /* Last of all, set up some receive buffers. */ 1847 for (i = 0; i < vi->curr_queue_pairs; i++) { 1848 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); 1849 1850 /* If we didn't even get one input buffer, we're useless. */ 1851 if (vi->rq[i].vq->num_free == 1852 virtqueue_get_vring_size(vi->rq[i].vq)) { 1853 free_unused_bufs(vi); 1854 err = -ENOMEM; 1855 goto free_recv_bufs; 1856 } 1857 } 1858 1859 vi->nb.notifier_call = &virtnet_cpu_callback; 1860 err = register_hotcpu_notifier(&vi->nb); 1861 if (err) { 1862 pr_debug("virtio_net: registering cpu notifier failed\n"); 1863 goto free_recv_bufs; 1864 } 1865 1866 /* Assume link up if device can't report link status, 1867 otherwise get link status from config. */ 1868 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1869 netif_carrier_off(dev); 1870 schedule_work(&vi->config_work); 1871 } else { 1872 vi->status = VIRTIO_NET_S_LINK_UP; 1873 netif_carrier_on(dev); 1874 } 1875 1876 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1877 dev->name, max_queue_pairs); 1878 1879 return 0; 1880 1881 free_recv_bufs: 1882 vi->vdev->config->reset(vdev); 1883 1884 free_receive_bufs(vi); 1885 unregister_netdev(dev); 1886 free_vqs: 1887 cancel_delayed_work_sync(&vi->refill); 1888 free_receive_page_frags(vi); 1889 virtnet_del_vqs(vi); 1890 free_stats: 1891 free_percpu(vi->stats); 1892 free: 1893 free_netdev(dev); 1894 return err; 1895 } 1896 1897 static void remove_vq_common(struct virtnet_info *vi) 1898 { 1899 vi->vdev->config->reset(vi->vdev); 1900 1901 /* Free unused buffers in both send and recv, if any. */ 1902 free_unused_bufs(vi); 1903 1904 free_receive_bufs(vi); 1905 1906 free_receive_page_frags(vi); 1907 1908 virtnet_del_vqs(vi); 1909 } 1910 1911 static void virtnet_remove(struct virtio_device *vdev) 1912 { 1913 struct virtnet_info *vi = vdev->priv; 1914 1915 unregister_hotcpu_notifier(&vi->nb); 1916 1917 /* Make sure no work handler is accessing the device. */ 1918 flush_work(&vi->config_work); 1919 1920 unregister_netdev(vi->dev); 1921 1922 remove_vq_common(vi); 1923 1924 free_percpu(vi->stats); 1925 free_netdev(vi->dev); 1926 } 1927 1928 #ifdef CONFIG_PM_SLEEP 1929 static int virtnet_freeze(struct virtio_device *vdev) 1930 { 1931 struct virtnet_info *vi = vdev->priv; 1932 int i; 1933 1934 unregister_hotcpu_notifier(&vi->nb); 1935 1936 /* Make sure no work handler is accessing the device */ 1937 flush_work(&vi->config_work); 1938 1939 netif_device_detach(vi->dev); 1940 cancel_delayed_work_sync(&vi->refill); 1941 1942 if (netif_running(vi->dev)) { 1943 for (i = 0; i < vi->max_queue_pairs; i++) { 1944 napi_disable(&vi->rq[i].napi); 1945 napi_hash_del(&vi->rq[i].napi); 1946 netif_napi_del(&vi->rq[i].napi); 1947 } 1948 } 1949 1950 remove_vq_common(vi); 1951 1952 return 0; 1953 } 1954 1955 static int virtnet_restore(struct virtio_device *vdev) 1956 { 1957 struct virtnet_info *vi = vdev->priv; 1958 int err, i; 1959 1960 err = init_vqs(vi); 1961 if (err) 1962 return err; 1963 1964 virtio_device_ready(vdev); 1965 1966 if (netif_running(vi->dev)) { 1967 for (i = 0; i < vi->curr_queue_pairs; i++) 1968 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1969 schedule_delayed_work(&vi->refill, 0); 1970 1971 for (i = 0; i < vi->max_queue_pairs; i++) 1972 virtnet_napi_enable(&vi->rq[i]); 1973 } 1974 1975 netif_device_attach(vi->dev); 1976 1977 rtnl_lock(); 1978 virtnet_set_queues(vi, vi->curr_queue_pairs); 1979 rtnl_unlock(); 1980 1981 err = register_hotcpu_notifier(&vi->nb); 1982 if (err) 1983 return err; 1984 1985 return 0; 1986 } 1987 #endif 1988 1989 static struct virtio_device_id id_table[] = { 1990 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1991 { 0 }, 1992 }; 1993 1994 static unsigned int features[] = { 1995 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1996 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1997 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_TSO6, 1998 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 1999 VIRTIO_NET_F_GUEST_ECN, 2000 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 2001 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 2002 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 2003 VIRTIO_NET_F_CTRL_MAC_ADDR, 2004 VIRTIO_F_ANY_LAYOUT, 2005 }; 2006 2007 static struct virtio_driver virtio_net_driver = { 2008 .feature_table = features, 2009 .feature_table_size = ARRAY_SIZE(features), 2010 .driver.name = KBUILD_MODNAME, 2011 .driver.owner = THIS_MODULE, 2012 .id_table = id_table, 2013 .probe = virtnet_probe, 2014 .remove = virtnet_remove, 2015 .config_changed = virtnet_config_changed, 2016 #ifdef CONFIG_PM_SLEEP 2017 .freeze = virtnet_freeze, 2018 .restore = virtnet_restore, 2019 #endif 2020 }; 2021 2022 module_virtio_driver(virtio_net_driver); 2023 2024 MODULE_DEVICE_TABLE(virtio, id_table); 2025 MODULE_DESCRIPTION("Virtio network driver"); 2026 MODULE_LICENSE("GPL"); 2027