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 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 494 break; 495 case VIRTIO_NET_HDR_GSO_TCPV6: 496 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 497 break; 498 default: 499 net_warn_ratelimited("%s: bad gso type %u.\n", 500 dev->name, hdr->hdr.gso_type); 501 goto frame_err; 502 } 503 504 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 505 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 506 507 skb_shinfo(skb)->gso_size = virtio16_to_cpu(vi->vdev, 508 hdr->hdr.gso_size); 509 if (skb_shinfo(skb)->gso_size == 0) { 510 net_warn_ratelimited("%s: zero gso size.\n", dev->name); 511 goto frame_err; 512 } 513 514 /* Header must be checked, and gso_segs computed. */ 515 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; 516 skb_shinfo(skb)->gso_segs = 0; 517 } 518 519 skb_mark_napi_id(skb, &rq->napi); 520 521 netif_receive_skb(skb); 522 return; 523 524 frame_err: 525 dev->stats.rx_frame_errors++; 526 dev_kfree_skb(skb); 527 } 528 529 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 530 gfp_t gfp) 531 { 532 struct sk_buff *skb; 533 struct virtio_net_hdr_mrg_rxbuf *hdr; 534 int err; 535 536 skb = __netdev_alloc_skb_ip_align(vi->dev, GOOD_PACKET_LEN, gfp); 537 if (unlikely(!skb)) 538 return -ENOMEM; 539 540 skb_put(skb, GOOD_PACKET_LEN); 541 542 hdr = skb_vnet_hdr(skb); 543 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 544 sg_set_buf(rq->sg, hdr, vi->hdr_len); 545 skb_to_sgvec(skb, rq->sg + 1, 0, skb->len); 546 547 err = virtqueue_add_inbuf(rq->vq, rq->sg, 2, skb, gfp); 548 if (err < 0) 549 dev_kfree_skb(skb); 550 551 return err; 552 } 553 554 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 555 gfp_t gfp) 556 { 557 struct page *first, *list = NULL; 558 char *p; 559 int i, err, offset; 560 561 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 562 563 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 564 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 565 first = get_a_page(rq, gfp); 566 if (!first) { 567 if (list) 568 give_pages(rq, list); 569 return -ENOMEM; 570 } 571 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 572 573 /* chain new page in list head to match sg */ 574 first->private = (unsigned long)list; 575 list = first; 576 } 577 578 first = get_a_page(rq, gfp); 579 if (!first) { 580 give_pages(rq, list); 581 return -ENOMEM; 582 } 583 p = page_address(first); 584 585 /* rq->sg[0], rq->sg[1] share the same page */ 586 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 587 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 588 589 /* rq->sg[1] for data packet, from offset */ 590 offset = sizeof(struct padded_vnet_hdr); 591 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 592 593 /* chain first in list head */ 594 first->private = (unsigned long)list; 595 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 596 first, gfp); 597 if (err < 0) 598 give_pages(rq, first); 599 600 return err; 601 } 602 603 static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) 604 { 605 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 606 unsigned int len; 607 608 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), 609 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); 610 return ALIGN(len, MERGEABLE_BUFFER_ALIGN); 611 } 612 613 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) 614 { 615 struct page_frag *alloc_frag = &rq->alloc_frag; 616 char *buf; 617 unsigned long ctx; 618 int err; 619 unsigned int len, hole; 620 621 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); 622 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 623 return -ENOMEM; 624 625 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 626 ctx = mergeable_buf_to_ctx(buf, len); 627 get_page(alloc_frag->page); 628 alloc_frag->offset += len; 629 hole = alloc_frag->size - alloc_frag->offset; 630 if (hole < len) { 631 /* To avoid internal fragmentation, if there is very likely not 632 * enough space for another buffer, add the remaining space to 633 * the current buffer. This extra space is not included in 634 * the truesize stored in ctx. 635 */ 636 len += hole; 637 alloc_frag->offset += hole; 638 } 639 640 sg_init_one(rq->sg, buf, len); 641 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); 642 if (err < 0) 643 put_page(virt_to_head_page(buf)); 644 645 return err; 646 } 647 648 /* 649 * Returns false if we couldn't fill entirely (OOM). 650 * 651 * Normally run in the receive path, but can also be run from ndo_open 652 * before we're receiving packets, or from refill_work which is 653 * careful to disable receiving (using napi_disable). 654 */ 655 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 656 gfp_t gfp) 657 { 658 int err; 659 bool oom; 660 661 gfp |= __GFP_COLD; 662 do { 663 if (vi->mergeable_rx_bufs) 664 err = add_recvbuf_mergeable(rq, gfp); 665 else if (vi->big_packets) 666 err = add_recvbuf_big(vi, rq, gfp); 667 else 668 err = add_recvbuf_small(vi, rq, gfp); 669 670 oom = err == -ENOMEM; 671 if (err) 672 break; 673 } while (rq->vq->num_free); 674 virtqueue_kick(rq->vq); 675 return !oom; 676 } 677 678 static void skb_recv_done(struct virtqueue *rvq) 679 { 680 struct virtnet_info *vi = rvq->vdev->priv; 681 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 682 683 /* Schedule NAPI, Suppress further interrupts if successful. */ 684 if (napi_schedule_prep(&rq->napi)) { 685 virtqueue_disable_cb(rvq); 686 __napi_schedule(&rq->napi); 687 } 688 } 689 690 static void virtnet_napi_enable(struct receive_queue *rq) 691 { 692 napi_enable(&rq->napi); 693 694 /* If all buffers were filled by other side before we napi_enabled, we 695 * won't get another interrupt, so process any outstanding packets 696 * now. virtnet_poll wants re-enable the queue, so we disable here. 697 * We synchronize against interrupts via NAPI_STATE_SCHED */ 698 if (napi_schedule_prep(&rq->napi)) { 699 virtqueue_disable_cb(rq->vq); 700 local_bh_disable(); 701 __napi_schedule(&rq->napi); 702 local_bh_enable(); 703 } 704 } 705 706 static void refill_work(struct work_struct *work) 707 { 708 struct virtnet_info *vi = 709 container_of(work, struct virtnet_info, refill.work); 710 bool still_empty; 711 int i; 712 713 for (i = 0; i < vi->curr_queue_pairs; i++) { 714 struct receive_queue *rq = &vi->rq[i]; 715 716 napi_disable(&rq->napi); 717 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 718 virtnet_napi_enable(rq); 719 720 /* In theory, this can happen: if we don't get any buffers in 721 * we will *never* try to fill again. 722 */ 723 if (still_empty) 724 schedule_delayed_work(&vi->refill, HZ/2); 725 } 726 } 727 728 static int virtnet_receive(struct receive_queue *rq, int budget) 729 { 730 struct virtnet_info *vi = rq->vq->vdev->priv; 731 unsigned int len, received = 0; 732 void *buf; 733 734 while (received < budget && 735 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 736 receive_buf(vi, rq, buf, len); 737 received++; 738 } 739 740 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 741 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) 742 schedule_delayed_work(&vi->refill, 0); 743 } 744 745 return received; 746 } 747 748 static int virtnet_poll(struct napi_struct *napi, int budget) 749 { 750 struct receive_queue *rq = 751 container_of(napi, struct receive_queue, napi); 752 unsigned int r, received = 0; 753 754 received += virtnet_receive(rq, budget - received); 755 756 /* Out of packets? */ 757 if (received < budget) { 758 r = virtqueue_enable_cb_prepare(rq->vq); 759 napi_complete(napi); 760 if (unlikely(virtqueue_poll(rq->vq, r)) && 761 napi_schedule_prep(napi)) { 762 virtqueue_disable_cb(rq->vq); 763 __napi_schedule(napi); 764 } 765 } 766 767 return received; 768 } 769 770 #ifdef CONFIG_NET_RX_BUSY_POLL 771 /* must be called with local_bh_disable()d */ 772 static int virtnet_busy_poll(struct napi_struct *napi) 773 { 774 struct receive_queue *rq = 775 container_of(napi, struct receive_queue, napi); 776 struct virtnet_info *vi = rq->vq->vdev->priv; 777 int r, received = 0, budget = 4; 778 779 if (!(vi->status & VIRTIO_NET_S_LINK_UP)) 780 return LL_FLUSH_FAILED; 781 782 if (!napi_schedule_prep(napi)) 783 return LL_FLUSH_BUSY; 784 785 virtqueue_disable_cb(rq->vq); 786 787 again: 788 received += virtnet_receive(rq, budget); 789 790 r = virtqueue_enable_cb_prepare(rq->vq); 791 clear_bit(NAPI_STATE_SCHED, &napi->state); 792 if (unlikely(virtqueue_poll(rq->vq, r)) && 793 napi_schedule_prep(napi)) { 794 virtqueue_disable_cb(rq->vq); 795 if (received < budget) { 796 budget -= received; 797 goto again; 798 } else { 799 __napi_schedule(napi); 800 } 801 } 802 803 return received; 804 } 805 #endif /* CONFIG_NET_RX_BUSY_POLL */ 806 807 static int virtnet_open(struct net_device *dev) 808 { 809 struct virtnet_info *vi = netdev_priv(dev); 810 int i; 811 812 for (i = 0; i < vi->max_queue_pairs; i++) { 813 if (i < vi->curr_queue_pairs) 814 /* Make sure we have some buffers: if oom use wq. */ 815 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 816 schedule_delayed_work(&vi->refill, 0); 817 virtnet_napi_enable(&vi->rq[i]); 818 } 819 820 return 0; 821 } 822 823 static void free_old_xmit_skbs(struct send_queue *sq) 824 { 825 struct sk_buff *skb; 826 unsigned int len; 827 struct virtnet_info *vi = sq->vq->vdev->priv; 828 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 829 830 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 831 pr_debug("Sent skb %p\n", skb); 832 833 u64_stats_update_begin(&stats->tx_syncp); 834 stats->tx_bytes += skb->len; 835 stats->tx_packets++; 836 u64_stats_update_end(&stats->tx_syncp); 837 838 dev_kfree_skb_any(skb); 839 } 840 } 841 842 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 843 { 844 struct virtio_net_hdr_mrg_rxbuf *hdr; 845 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 846 struct virtnet_info *vi = sq->vq->vdev->priv; 847 unsigned num_sg; 848 unsigned hdr_len = vi->hdr_len; 849 bool can_push; 850 851 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 852 853 can_push = vi->any_header_sg && 854 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 855 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 856 /* Even if we can, don't push here yet as this would skew 857 * csum_start offset below. */ 858 if (can_push) 859 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 860 else 861 hdr = skb_vnet_hdr(skb); 862 863 if (skb->ip_summed == CHECKSUM_PARTIAL) { 864 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 865 hdr->hdr.csum_start = cpu_to_virtio16(vi->vdev, 866 skb_checksum_start_offset(skb)); 867 hdr->hdr.csum_offset = cpu_to_virtio16(vi->vdev, 868 skb->csum_offset); 869 } else { 870 hdr->hdr.flags = 0; 871 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 872 } 873 874 if (skb_is_gso(skb)) { 875 hdr->hdr.hdr_len = cpu_to_virtio16(vi->vdev, skb_headlen(skb)); 876 hdr->hdr.gso_size = cpu_to_virtio16(vi->vdev, 877 skb_shinfo(skb)->gso_size); 878 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 879 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 880 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 881 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 882 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 883 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; 884 else 885 BUG(); 886 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 887 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 888 } else { 889 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 890 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 891 } 892 893 if (vi->mergeable_rx_bufs) 894 hdr->num_buffers = 0; 895 896 sg_init_table(sq->sg, MAX_SKB_FRAGS + 2); 897 if (can_push) { 898 __skb_push(skb, hdr_len); 899 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 900 /* Pull header back to avoid skew in tx bytes calculations. */ 901 __skb_pull(skb, hdr_len); 902 } else { 903 sg_set_buf(sq->sg, hdr, hdr_len); 904 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; 905 } 906 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 907 } 908 909 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 910 { 911 struct virtnet_info *vi = netdev_priv(dev); 912 int qnum = skb_get_queue_mapping(skb); 913 struct send_queue *sq = &vi->sq[qnum]; 914 int err; 915 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 916 bool kick = !skb->xmit_more; 917 918 /* Free up any pending old buffers before queueing new ones. */ 919 free_old_xmit_skbs(sq); 920 921 /* Try to transmit */ 922 err = xmit_skb(sq, skb); 923 924 /* This should not happen! */ 925 if (unlikely(err)) { 926 dev->stats.tx_fifo_errors++; 927 if (net_ratelimit()) 928 dev_warn(&dev->dev, 929 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 930 dev->stats.tx_dropped++; 931 dev_kfree_skb_any(skb); 932 return NETDEV_TX_OK; 933 } 934 935 /* Don't wait up for transmitted skbs to be freed. */ 936 skb_orphan(skb); 937 nf_reset(skb); 938 939 /* Apparently nice girls don't return TX_BUSY; stop the queue 940 * before it gets out of hand. Naturally, this wastes entries. */ 941 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 942 netif_stop_subqueue(dev, qnum); 943 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 944 /* More just got used, free them then recheck. */ 945 free_old_xmit_skbs(sq); 946 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 947 netif_start_subqueue(dev, qnum); 948 virtqueue_disable_cb(sq->vq); 949 } 950 } 951 } 952 953 if (kick || netif_xmit_stopped(txq)) 954 virtqueue_kick(sq->vq); 955 956 return NETDEV_TX_OK; 957 } 958 959 /* 960 * Send command via the control virtqueue and check status. Commands 961 * supported by the hypervisor, as indicated by feature bits, should 962 * never fail unless improperly formatted. 963 */ 964 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 965 struct scatterlist *out) 966 { 967 struct scatterlist *sgs[4], hdr, stat; 968 struct virtio_net_ctrl_hdr ctrl; 969 virtio_net_ctrl_ack status = ~0; 970 unsigned out_num = 0, tmp; 971 972 /* Caller should know better */ 973 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 974 975 ctrl.class = class; 976 ctrl.cmd = cmd; 977 /* Add header */ 978 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 979 sgs[out_num++] = &hdr; 980 981 if (out) 982 sgs[out_num++] = out; 983 984 /* Add return status. */ 985 sg_init_one(&stat, &status, sizeof(status)); 986 sgs[out_num] = &stat; 987 988 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 989 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 990 991 if (unlikely(!virtqueue_kick(vi->cvq))) 992 return status == VIRTIO_NET_OK; 993 994 /* Spin for a response, the kick causes an ioport write, trapping 995 * into the hypervisor, so the request should be handled immediately. 996 */ 997 while (!virtqueue_get_buf(vi->cvq, &tmp) && 998 !virtqueue_is_broken(vi->cvq)) 999 cpu_relax(); 1000 1001 return status == VIRTIO_NET_OK; 1002 } 1003 1004 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1005 { 1006 struct virtnet_info *vi = netdev_priv(dev); 1007 struct virtio_device *vdev = vi->vdev; 1008 int ret; 1009 struct sockaddr *addr = p; 1010 struct scatterlist sg; 1011 1012 ret = eth_prepare_mac_addr_change(dev, p); 1013 if (ret) 1014 return ret; 1015 1016 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1017 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1018 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1019 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1020 dev_warn(&vdev->dev, 1021 "Failed to set mac address by vq command.\n"); 1022 return -EINVAL; 1023 } 1024 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1025 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1026 unsigned int i; 1027 1028 /* Naturally, this has an atomicity problem. */ 1029 for (i = 0; i < dev->addr_len; i++) 1030 virtio_cwrite8(vdev, 1031 offsetof(struct virtio_net_config, mac) + 1032 i, addr->sa_data[i]); 1033 } 1034 1035 eth_commit_mac_addr_change(dev, p); 1036 1037 return 0; 1038 } 1039 1040 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1041 struct rtnl_link_stats64 *tot) 1042 { 1043 struct virtnet_info *vi = netdev_priv(dev); 1044 int cpu; 1045 unsigned int start; 1046 1047 for_each_possible_cpu(cpu) { 1048 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1049 u64 tpackets, tbytes, rpackets, rbytes; 1050 1051 do { 1052 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1053 tpackets = stats->tx_packets; 1054 tbytes = stats->tx_bytes; 1055 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1056 1057 do { 1058 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1059 rpackets = stats->rx_packets; 1060 rbytes = stats->rx_bytes; 1061 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1062 1063 tot->rx_packets += rpackets; 1064 tot->tx_packets += tpackets; 1065 tot->rx_bytes += rbytes; 1066 tot->tx_bytes += tbytes; 1067 } 1068 1069 tot->tx_dropped = dev->stats.tx_dropped; 1070 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1071 tot->rx_dropped = dev->stats.rx_dropped; 1072 tot->rx_length_errors = dev->stats.rx_length_errors; 1073 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1074 1075 return tot; 1076 } 1077 1078 #ifdef CONFIG_NET_POLL_CONTROLLER 1079 static void virtnet_netpoll(struct net_device *dev) 1080 { 1081 struct virtnet_info *vi = netdev_priv(dev); 1082 int i; 1083 1084 for (i = 0; i < vi->curr_queue_pairs; i++) 1085 napi_schedule(&vi->rq[i].napi); 1086 } 1087 #endif 1088 1089 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1090 { 1091 rtnl_lock(); 1092 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1093 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1094 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1095 rtnl_unlock(); 1096 } 1097 1098 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1099 { 1100 struct scatterlist sg; 1101 struct virtio_net_ctrl_mq s; 1102 struct net_device *dev = vi->dev; 1103 1104 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1105 return 0; 1106 1107 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1108 sg_init_one(&sg, &s, sizeof(s)); 1109 1110 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1111 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1112 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1113 queue_pairs); 1114 return -EINVAL; 1115 } else { 1116 vi->curr_queue_pairs = queue_pairs; 1117 /* virtnet_open() will refill when device is going to up. */ 1118 if (dev->flags & IFF_UP) 1119 schedule_delayed_work(&vi->refill, 0); 1120 } 1121 1122 return 0; 1123 } 1124 1125 static int virtnet_close(struct net_device *dev) 1126 { 1127 struct virtnet_info *vi = netdev_priv(dev); 1128 int i; 1129 1130 /* Make sure refill_work doesn't re-enable napi! */ 1131 cancel_delayed_work_sync(&vi->refill); 1132 1133 for (i = 0; i < vi->max_queue_pairs; i++) 1134 napi_disable(&vi->rq[i].napi); 1135 1136 return 0; 1137 } 1138 1139 static void virtnet_set_rx_mode(struct net_device *dev) 1140 { 1141 struct virtnet_info *vi = netdev_priv(dev); 1142 struct scatterlist sg[2]; 1143 u8 promisc, allmulti; 1144 struct virtio_net_ctrl_mac *mac_data; 1145 struct netdev_hw_addr *ha; 1146 int uc_count; 1147 int mc_count; 1148 void *buf; 1149 int i; 1150 1151 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1152 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1153 return; 1154 1155 promisc = ((dev->flags & IFF_PROMISC) != 0); 1156 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1157 1158 sg_init_one(sg, &promisc, sizeof(promisc)); 1159 1160 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1161 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1162 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1163 promisc ? "en" : "dis"); 1164 1165 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1166 1167 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1168 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1169 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1170 allmulti ? "en" : "dis"); 1171 1172 uc_count = netdev_uc_count(dev); 1173 mc_count = netdev_mc_count(dev); 1174 /* MAC filter - use one buffer for both lists */ 1175 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1176 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1177 mac_data = buf; 1178 if (!buf) 1179 return; 1180 1181 sg_init_table(sg, 2); 1182 1183 /* Store the unicast list and count in the front of the buffer */ 1184 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1185 i = 0; 1186 netdev_for_each_uc_addr(ha, dev) 1187 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1188 1189 sg_set_buf(&sg[0], mac_data, 1190 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1191 1192 /* multicast list and count fill the end */ 1193 mac_data = (void *)&mac_data->macs[uc_count][0]; 1194 1195 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1196 i = 0; 1197 netdev_for_each_mc_addr(ha, dev) 1198 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1199 1200 sg_set_buf(&sg[1], mac_data, 1201 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1202 1203 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1204 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1205 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1206 1207 kfree(buf); 1208 } 1209 1210 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1211 __be16 proto, u16 vid) 1212 { 1213 struct virtnet_info *vi = netdev_priv(dev); 1214 struct scatterlist sg; 1215 1216 sg_init_one(&sg, &vid, sizeof(vid)); 1217 1218 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1219 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1220 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1221 return 0; 1222 } 1223 1224 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1225 __be16 proto, u16 vid) 1226 { 1227 struct virtnet_info *vi = netdev_priv(dev); 1228 struct scatterlist sg; 1229 1230 sg_init_one(&sg, &vid, sizeof(vid)); 1231 1232 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1233 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1234 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1235 return 0; 1236 } 1237 1238 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1239 { 1240 int i; 1241 1242 if (vi->affinity_hint_set) { 1243 for (i = 0; i < vi->max_queue_pairs; i++) { 1244 virtqueue_set_affinity(vi->rq[i].vq, -1); 1245 virtqueue_set_affinity(vi->sq[i].vq, -1); 1246 } 1247 1248 vi->affinity_hint_set = false; 1249 } 1250 } 1251 1252 static void virtnet_set_affinity(struct virtnet_info *vi) 1253 { 1254 int i; 1255 int cpu; 1256 1257 /* In multiqueue mode, when the number of cpu is equal to the number of 1258 * queue pairs, we let the queue pairs to be private to one cpu by 1259 * setting the affinity hint to eliminate the contention. 1260 */ 1261 if (vi->curr_queue_pairs == 1 || 1262 vi->max_queue_pairs != num_online_cpus()) { 1263 virtnet_clean_affinity(vi, -1); 1264 return; 1265 } 1266 1267 i = 0; 1268 for_each_online_cpu(cpu) { 1269 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1270 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1271 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1272 i++; 1273 } 1274 1275 vi->affinity_hint_set = true; 1276 } 1277 1278 static int virtnet_cpu_callback(struct notifier_block *nfb, 1279 unsigned long action, void *hcpu) 1280 { 1281 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1282 1283 switch(action & ~CPU_TASKS_FROZEN) { 1284 case CPU_ONLINE: 1285 case CPU_DOWN_FAILED: 1286 case CPU_DEAD: 1287 virtnet_set_affinity(vi); 1288 break; 1289 case CPU_DOWN_PREPARE: 1290 virtnet_clean_affinity(vi, (long)hcpu); 1291 break; 1292 default: 1293 break; 1294 } 1295 1296 return NOTIFY_OK; 1297 } 1298 1299 static void virtnet_get_ringparam(struct net_device *dev, 1300 struct ethtool_ringparam *ring) 1301 { 1302 struct virtnet_info *vi = netdev_priv(dev); 1303 1304 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1305 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1306 ring->rx_pending = ring->rx_max_pending; 1307 ring->tx_pending = ring->tx_max_pending; 1308 } 1309 1310 1311 static void virtnet_get_drvinfo(struct net_device *dev, 1312 struct ethtool_drvinfo *info) 1313 { 1314 struct virtnet_info *vi = netdev_priv(dev); 1315 struct virtio_device *vdev = vi->vdev; 1316 1317 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1318 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1319 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1320 1321 } 1322 1323 /* TODO: Eliminate OOO packets during switching */ 1324 static int virtnet_set_channels(struct net_device *dev, 1325 struct ethtool_channels *channels) 1326 { 1327 struct virtnet_info *vi = netdev_priv(dev); 1328 u16 queue_pairs = channels->combined_count; 1329 int err; 1330 1331 /* We don't support separate rx/tx channels. 1332 * We don't allow setting 'other' channels. 1333 */ 1334 if (channels->rx_count || channels->tx_count || channels->other_count) 1335 return -EINVAL; 1336 1337 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1338 return -EINVAL; 1339 1340 get_online_cpus(); 1341 err = virtnet_set_queues(vi, queue_pairs); 1342 if (!err) { 1343 netif_set_real_num_tx_queues(dev, queue_pairs); 1344 netif_set_real_num_rx_queues(dev, queue_pairs); 1345 1346 virtnet_set_affinity(vi); 1347 } 1348 put_online_cpus(); 1349 1350 return err; 1351 } 1352 1353 static void virtnet_get_channels(struct net_device *dev, 1354 struct ethtool_channels *channels) 1355 { 1356 struct virtnet_info *vi = netdev_priv(dev); 1357 1358 channels->combined_count = vi->curr_queue_pairs; 1359 channels->max_combined = vi->max_queue_pairs; 1360 channels->max_other = 0; 1361 channels->rx_count = 0; 1362 channels->tx_count = 0; 1363 channels->other_count = 0; 1364 } 1365 1366 static const struct ethtool_ops virtnet_ethtool_ops = { 1367 .get_drvinfo = virtnet_get_drvinfo, 1368 .get_link = ethtool_op_get_link, 1369 .get_ringparam = virtnet_get_ringparam, 1370 .set_channels = virtnet_set_channels, 1371 .get_channels = virtnet_get_channels, 1372 }; 1373 1374 #define MIN_MTU 68 1375 #define MAX_MTU 65535 1376 1377 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1378 { 1379 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1380 return -EINVAL; 1381 dev->mtu = new_mtu; 1382 return 0; 1383 } 1384 1385 static const struct net_device_ops virtnet_netdev = { 1386 .ndo_open = virtnet_open, 1387 .ndo_stop = virtnet_close, 1388 .ndo_start_xmit = start_xmit, 1389 .ndo_validate_addr = eth_validate_addr, 1390 .ndo_set_mac_address = virtnet_set_mac_address, 1391 .ndo_set_rx_mode = virtnet_set_rx_mode, 1392 .ndo_change_mtu = virtnet_change_mtu, 1393 .ndo_get_stats64 = virtnet_stats, 1394 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1395 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1396 #ifdef CONFIG_NET_POLL_CONTROLLER 1397 .ndo_poll_controller = virtnet_netpoll, 1398 #endif 1399 #ifdef CONFIG_NET_RX_BUSY_POLL 1400 .ndo_busy_poll = virtnet_busy_poll, 1401 #endif 1402 }; 1403 1404 static void virtnet_config_changed_work(struct work_struct *work) 1405 { 1406 struct virtnet_info *vi = 1407 container_of(work, struct virtnet_info, config_work); 1408 u16 v; 1409 1410 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1411 struct virtio_net_config, status, &v) < 0) 1412 return; 1413 1414 if (v & VIRTIO_NET_S_ANNOUNCE) { 1415 netdev_notify_peers(vi->dev); 1416 virtnet_ack_link_announce(vi); 1417 } 1418 1419 /* Ignore unknown (future) status bits */ 1420 v &= VIRTIO_NET_S_LINK_UP; 1421 1422 if (vi->status == v) 1423 return; 1424 1425 vi->status = v; 1426 1427 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1428 netif_carrier_on(vi->dev); 1429 netif_tx_wake_all_queues(vi->dev); 1430 } else { 1431 netif_carrier_off(vi->dev); 1432 netif_tx_stop_all_queues(vi->dev); 1433 } 1434 } 1435 1436 static void virtnet_config_changed(struct virtio_device *vdev) 1437 { 1438 struct virtnet_info *vi = vdev->priv; 1439 1440 schedule_work(&vi->config_work); 1441 } 1442 1443 static void virtnet_free_queues(struct virtnet_info *vi) 1444 { 1445 int i; 1446 1447 for (i = 0; i < vi->max_queue_pairs; i++) 1448 netif_napi_del(&vi->rq[i].napi); 1449 1450 kfree(vi->rq); 1451 kfree(vi->sq); 1452 } 1453 1454 static void free_receive_bufs(struct virtnet_info *vi) 1455 { 1456 int i; 1457 1458 for (i = 0; i < vi->max_queue_pairs; i++) { 1459 while (vi->rq[i].pages) 1460 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1461 } 1462 } 1463 1464 static void free_receive_page_frags(struct virtnet_info *vi) 1465 { 1466 int i; 1467 for (i = 0; i < vi->max_queue_pairs; i++) 1468 if (vi->rq[i].alloc_frag.page) 1469 put_page(vi->rq[i].alloc_frag.page); 1470 } 1471 1472 static void free_unused_bufs(struct virtnet_info *vi) 1473 { 1474 void *buf; 1475 int i; 1476 1477 for (i = 0; i < vi->max_queue_pairs; i++) { 1478 struct virtqueue *vq = vi->sq[i].vq; 1479 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1480 dev_kfree_skb(buf); 1481 } 1482 1483 for (i = 0; i < vi->max_queue_pairs; i++) { 1484 struct virtqueue *vq = vi->rq[i].vq; 1485 1486 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1487 if (vi->mergeable_rx_bufs) { 1488 unsigned long ctx = (unsigned long)buf; 1489 void *base = mergeable_ctx_to_buf_address(ctx); 1490 put_page(virt_to_head_page(base)); 1491 } else if (vi->big_packets) { 1492 give_pages(&vi->rq[i], buf); 1493 } else { 1494 dev_kfree_skb(buf); 1495 } 1496 } 1497 } 1498 } 1499 1500 static void virtnet_del_vqs(struct virtnet_info *vi) 1501 { 1502 struct virtio_device *vdev = vi->vdev; 1503 1504 virtnet_clean_affinity(vi, -1); 1505 1506 vdev->config->del_vqs(vdev); 1507 1508 virtnet_free_queues(vi); 1509 } 1510 1511 static int virtnet_find_vqs(struct virtnet_info *vi) 1512 { 1513 vq_callback_t **callbacks; 1514 struct virtqueue **vqs; 1515 int ret = -ENOMEM; 1516 int i, total_vqs; 1517 const char **names; 1518 1519 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1520 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1521 * possible control vq. 1522 */ 1523 total_vqs = vi->max_queue_pairs * 2 + 1524 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1525 1526 /* Allocate space for find_vqs parameters */ 1527 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1528 if (!vqs) 1529 goto err_vq; 1530 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1531 if (!callbacks) 1532 goto err_callback; 1533 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1534 if (!names) 1535 goto err_names; 1536 1537 /* Parameters for control virtqueue, if any */ 1538 if (vi->has_cvq) { 1539 callbacks[total_vqs - 1] = NULL; 1540 names[total_vqs - 1] = "control"; 1541 } 1542 1543 /* Allocate/initialize parameters for send/receive virtqueues */ 1544 for (i = 0; i < vi->max_queue_pairs; i++) { 1545 callbacks[rxq2vq(i)] = skb_recv_done; 1546 callbacks[txq2vq(i)] = skb_xmit_done; 1547 sprintf(vi->rq[i].name, "input.%d", i); 1548 sprintf(vi->sq[i].name, "output.%d", i); 1549 names[rxq2vq(i)] = vi->rq[i].name; 1550 names[txq2vq(i)] = vi->sq[i].name; 1551 } 1552 1553 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1554 names); 1555 if (ret) 1556 goto err_find; 1557 1558 if (vi->has_cvq) { 1559 vi->cvq = vqs[total_vqs - 1]; 1560 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1561 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1562 } 1563 1564 for (i = 0; i < vi->max_queue_pairs; i++) { 1565 vi->rq[i].vq = vqs[rxq2vq(i)]; 1566 vi->sq[i].vq = vqs[txq2vq(i)]; 1567 } 1568 1569 kfree(names); 1570 kfree(callbacks); 1571 kfree(vqs); 1572 1573 return 0; 1574 1575 err_find: 1576 kfree(names); 1577 err_names: 1578 kfree(callbacks); 1579 err_callback: 1580 kfree(vqs); 1581 err_vq: 1582 return ret; 1583 } 1584 1585 static int virtnet_alloc_queues(struct virtnet_info *vi) 1586 { 1587 int i; 1588 1589 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1590 if (!vi->sq) 1591 goto err_sq; 1592 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1593 if (!vi->rq) 1594 goto err_rq; 1595 1596 INIT_DELAYED_WORK(&vi->refill, refill_work); 1597 for (i = 0; i < vi->max_queue_pairs; i++) { 1598 vi->rq[i].pages = NULL; 1599 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1600 napi_weight); 1601 napi_hash_add(&vi->rq[i].napi); 1602 1603 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1604 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1605 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1606 } 1607 1608 return 0; 1609 1610 err_rq: 1611 kfree(vi->sq); 1612 err_sq: 1613 return -ENOMEM; 1614 } 1615 1616 static int init_vqs(struct virtnet_info *vi) 1617 { 1618 int ret; 1619 1620 /* Allocate send & receive queues */ 1621 ret = virtnet_alloc_queues(vi); 1622 if (ret) 1623 goto err; 1624 1625 ret = virtnet_find_vqs(vi); 1626 if (ret) 1627 goto err_free; 1628 1629 get_online_cpus(); 1630 virtnet_set_affinity(vi); 1631 put_online_cpus(); 1632 1633 return 0; 1634 1635 err_free: 1636 virtnet_free_queues(vi); 1637 err: 1638 return ret; 1639 } 1640 1641 #ifdef CONFIG_SYSFS 1642 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1643 struct rx_queue_attribute *attribute, char *buf) 1644 { 1645 struct virtnet_info *vi = netdev_priv(queue->dev); 1646 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1647 struct ewma *avg; 1648 1649 BUG_ON(queue_index >= vi->max_queue_pairs); 1650 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1651 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1652 } 1653 1654 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1655 __ATTR_RO(mergeable_rx_buffer_size); 1656 1657 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1658 &mergeable_rx_buffer_size_attribute.attr, 1659 NULL 1660 }; 1661 1662 static const struct attribute_group virtio_net_mrg_rx_group = { 1663 .name = "virtio_net", 1664 .attrs = virtio_net_mrg_rx_attrs 1665 }; 1666 #endif 1667 1668 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 1669 unsigned int fbit, 1670 const char *fname, const char *dname) 1671 { 1672 if (!virtio_has_feature(vdev, fbit)) 1673 return false; 1674 1675 dev_err(&vdev->dev, "device advertises feature %s but not %s", 1676 fname, dname); 1677 1678 return true; 1679 } 1680 1681 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 1682 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 1683 1684 static bool virtnet_validate_features(struct virtio_device *vdev) 1685 { 1686 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 1687 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 1688 "VIRTIO_NET_F_CTRL_VQ") || 1689 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 1690 "VIRTIO_NET_F_CTRL_VQ") || 1691 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 1692 "VIRTIO_NET_F_CTRL_VQ") || 1693 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 1694 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 1695 "VIRTIO_NET_F_CTRL_VQ"))) { 1696 return false; 1697 } 1698 1699 return true; 1700 } 1701 1702 static int virtnet_probe(struct virtio_device *vdev) 1703 { 1704 int i, err; 1705 struct net_device *dev; 1706 struct virtnet_info *vi; 1707 u16 max_queue_pairs; 1708 1709 if (!virtnet_validate_features(vdev)) 1710 return -EINVAL; 1711 1712 /* Find if host supports multiqueue virtio_net device */ 1713 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1714 struct virtio_net_config, 1715 max_virtqueue_pairs, &max_queue_pairs); 1716 1717 /* We need at least 2 queue's */ 1718 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1719 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1720 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1721 max_queue_pairs = 1; 1722 1723 /* Allocate ourselves a network device with room for our info */ 1724 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1725 if (!dev) 1726 return -ENOMEM; 1727 1728 /* Set up network device as normal. */ 1729 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1730 dev->netdev_ops = &virtnet_netdev; 1731 dev->features = NETIF_F_HIGHDMA; 1732 1733 dev->ethtool_ops = &virtnet_ethtool_ops; 1734 SET_NETDEV_DEV(dev, &vdev->dev); 1735 1736 /* Do we support "hardware" checksums? */ 1737 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1738 /* This opens up the world of extra features. */ 1739 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1740 if (csum) 1741 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1742 1743 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1744 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1745 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1746 } 1747 /* Individual feature bits: what can host handle? */ 1748 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1749 dev->hw_features |= NETIF_F_TSO; 1750 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1751 dev->hw_features |= NETIF_F_TSO6; 1752 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1753 dev->hw_features |= NETIF_F_TSO_ECN; 1754 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1755 dev->hw_features |= NETIF_F_UFO; 1756 1757 if (gso) 1758 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1759 /* (!csum && gso) case will be fixed by register_netdev() */ 1760 } 1761 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1762 dev->features |= NETIF_F_RXCSUM; 1763 1764 dev->vlan_features = dev->features; 1765 1766 /* Configuration may specify what MAC to use. Otherwise random. */ 1767 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1768 virtio_cread_bytes(vdev, 1769 offsetof(struct virtio_net_config, mac), 1770 dev->dev_addr, dev->addr_len); 1771 else 1772 eth_hw_addr_random(dev); 1773 1774 /* Set up our device-specific information */ 1775 vi = netdev_priv(dev); 1776 vi->dev = dev; 1777 vi->vdev = vdev; 1778 vdev->priv = vi; 1779 vi->stats = alloc_percpu(struct virtnet_stats); 1780 err = -ENOMEM; 1781 if (vi->stats == NULL) 1782 goto free; 1783 1784 for_each_possible_cpu(i) { 1785 struct virtnet_stats *virtnet_stats; 1786 virtnet_stats = per_cpu_ptr(vi->stats, i); 1787 u64_stats_init(&virtnet_stats->tx_syncp); 1788 u64_stats_init(&virtnet_stats->rx_syncp); 1789 } 1790 1791 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1792 1793 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1794 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1795 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1796 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 1797 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 1798 vi->big_packets = true; 1799 1800 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1801 vi->mergeable_rx_bufs = true; 1802 1803 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 1804 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 1805 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1806 else 1807 vi->hdr_len = sizeof(struct virtio_net_hdr); 1808 1809 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1810 vi->any_header_sg = true; 1811 1812 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1813 vi->has_cvq = true; 1814 1815 if (vi->any_header_sg) 1816 dev->needed_headroom = vi->hdr_len; 1817 1818 /* Use single tx/rx queue pair as default */ 1819 vi->curr_queue_pairs = 1; 1820 vi->max_queue_pairs = max_queue_pairs; 1821 1822 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1823 err = init_vqs(vi); 1824 if (err) 1825 goto free_stats; 1826 1827 #ifdef CONFIG_SYSFS 1828 if (vi->mergeable_rx_bufs) 1829 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1830 #endif 1831 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1832 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1833 1834 err = register_netdev(dev); 1835 if (err) { 1836 pr_debug("virtio_net: registering device failed\n"); 1837 goto free_vqs; 1838 } 1839 1840 virtio_device_ready(vdev); 1841 1842 /* Last of all, set up some receive buffers. */ 1843 for (i = 0; i < vi->curr_queue_pairs; i++) { 1844 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); 1845 1846 /* If we didn't even get one input buffer, we're useless. */ 1847 if (vi->rq[i].vq->num_free == 1848 virtqueue_get_vring_size(vi->rq[i].vq)) { 1849 free_unused_bufs(vi); 1850 err = -ENOMEM; 1851 goto free_recv_bufs; 1852 } 1853 } 1854 1855 vi->nb.notifier_call = &virtnet_cpu_callback; 1856 err = register_hotcpu_notifier(&vi->nb); 1857 if (err) { 1858 pr_debug("virtio_net: registering cpu notifier failed\n"); 1859 goto free_recv_bufs; 1860 } 1861 1862 /* Assume link up if device can't report link status, 1863 otherwise get link status from config. */ 1864 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1865 netif_carrier_off(dev); 1866 schedule_work(&vi->config_work); 1867 } else { 1868 vi->status = VIRTIO_NET_S_LINK_UP; 1869 netif_carrier_on(dev); 1870 } 1871 1872 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1873 dev->name, max_queue_pairs); 1874 1875 return 0; 1876 1877 free_recv_bufs: 1878 vi->vdev->config->reset(vdev); 1879 1880 free_receive_bufs(vi); 1881 unregister_netdev(dev); 1882 free_vqs: 1883 cancel_delayed_work_sync(&vi->refill); 1884 free_receive_page_frags(vi); 1885 virtnet_del_vqs(vi); 1886 free_stats: 1887 free_percpu(vi->stats); 1888 free: 1889 free_netdev(dev); 1890 return err; 1891 } 1892 1893 static void remove_vq_common(struct virtnet_info *vi) 1894 { 1895 vi->vdev->config->reset(vi->vdev); 1896 1897 /* Free unused buffers in both send and recv, if any. */ 1898 free_unused_bufs(vi); 1899 1900 free_receive_bufs(vi); 1901 1902 free_receive_page_frags(vi); 1903 1904 virtnet_del_vqs(vi); 1905 } 1906 1907 static void virtnet_remove(struct virtio_device *vdev) 1908 { 1909 struct virtnet_info *vi = vdev->priv; 1910 1911 unregister_hotcpu_notifier(&vi->nb); 1912 1913 /* Make sure no work handler is accessing the device. */ 1914 flush_work(&vi->config_work); 1915 1916 unregister_netdev(vi->dev); 1917 1918 remove_vq_common(vi); 1919 1920 free_percpu(vi->stats); 1921 free_netdev(vi->dev); 1922 } 1923 1924 #ifdef CONFIG_PM_SLEEP 1925 static int virtnet_freeze(struct virtio_device *vdev) 1926 { 1927 struct virtnet_info *vi = vdev->priv; 1928 int i; 1929 1930 unregister_hotcpu_notifier(&vi->nb); 1931 1932 /* Make sure no work handler is accessing the device */ 1933 flush_work(&vi->config_work); 1934 1935 netif_device_detach(vi->dev); 1936 cancel_delayed_work_sync(&vi->refill); 1937 1938 if (netif_running(vi->dev)) { 1939 for (i = 0; i < vi->max_queue_pairs; i++) { 1940 napi_disable(&vi->rq[i].napi); 1941 napi_hash_del(&vi->rq[i].napi); 1942 netif_napi_del(&vi->rq[i].napi); 1943 } 1944 } 1945 1946 remove_vq_common(vi); 1947 1948 return 0; 1949 } 1950 1951 static int virtnet_restore(struct virtio_device *vdev) 1952 { 1953 struct virtnet_info *vi = vdev->priv; 1954 int err, i; 1955 1956 err = init_vqs(vi); 1957 if (err) 1958 return err; 1959 1960 virtio_device_ready(vdev); 1961 1962 if (netif_running(vi->dev)) { 1963 for (i = 0; i < vi->curr_queue_pairs; i++) 1964 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1965 schedule_delayed_work(&vi->refill, 0); 1966 1967 for (i = 0; i < vi->max_queue_pairs; i++) 1968 virtnet_napi_enable(&vi->rq[i]); 1969 } 1970 1971 netif_device_attach(vi->dev); 1972 1973 rtnl_lock(); 1974 virtnet_set_queues(vi, vi->curr_queue_pairs); 1975 rtnl_unlock(); 1976 1977 err = register_hotcpu_notifier(&vi->nb); 1978 if (err) 1979 return err; 1980 1981 return 0; 1982 } 1983 #endif 1984 1985 static struct virtio_device_id id_table[] = { 1986 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1987 { 0 }, 1988 }; 1989 1990 static unsigned int features[] = { 1991 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1992 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1993 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 1994 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 1995 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 1996 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 1997 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 1998 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 1999 VIRTIO_NET_F_CTRL_MAC_ADDR, 2000 VIRTIO_F_ANY_LAYOUT, 2001 }; 2002 2003 static struct virtio_driver virtio_net_driver = { 2004 .feature_table = features, 2005 .feature_table_size = ARRAY_SIZE(features), 2006 .driver.name = KBUILD_MODNAME, 2007 .driver.owner = THIS_MODULE, 2008 .id_table = id_table, 2009 .probe = virtnet_probe, 2010 .remove = virtnet_remove, 2011 .config_changed = virtnet_config_changed, 2012 #ifdef CONFIG_PM_SLEEP 2013 .freeze = virtnet_freeze, 2014 .restore = virtnet_restore, 2015 #endif 2016 }; 2017 2018 module_virtio_driver(virtio_net_driver); 2019 2020 MODULE_DEVICE_TABLE(virtio, id_table); 2021 MODULE_DESCRIPTION("Virtio network driver"); 2022 MODULE_LICENSE("GPL"); 2023