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 /* timestamp packet in software */ 922 skb_tx_timestamp(skb); 923 924 /* Try to transmit */ 925 err = xmit_skb(sq, skb); 926 927 /* This should not happen! */ 928 if (unlikely(err)) { 929 dev->stats.tx_fifo_errors++; 930 if (net_ratelimit()) 931 dev_warn(&dev->dev, 932 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 933 dev->stats.tx_dropped++; 934 dev_kfree_skb_any(skb); 935 return NETDEV_TX_OK; 936 } 937 938 /* Don't wait up for transmitted skbs to be freed. */ 939 skb_orphan(skb); 940 nf_reset(skb); 941 942 /* Apparently nice girls don't return TX_BUSY; stop the queue 943 * before it gets out of hand. Naturally, this wastes entries. */ 944 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 945 netif_stop_subqueue(dev, qnum); 946 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 947 /* More just got used, free them then recheck. */ 948 free_old_xmit_skbs(sq); 949 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 950 netif_start_subqueue(dev, qnum); 951 virtqueue_disable_cb(sq->vq); 952 } 953 } 954 } 955 956 if (kick || netif_xmit_stopped(txq)) 957 virtqueue_kick(sq->vq); 958 959 return NETDEV_TX_OK; 960 } 961 962 /* 963 * Send command via the control virtqueue and check status. Commands 964 * supported by the hypervisor, as indicated by feature bits, should 965 * never fail unless improperly formatted. 966 */ 967 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 968 struct scatterlist *out) 969 { 970 struct scatterlist *sgs[4], hdr, stat; 971 struct virtio_net_ctrl_hdr ctrl; 972 virtio_net_ctrl_ack status = ~0; 973 unsigned out_num = 0, tmp; 974 975 /* Caller should know better */ 976 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 977 978 ctrl.class = class; 979 ctrl.cmd = cmd; 980 /* Add header */ 981 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 982 sgs[out_num++] = &hdr; 983 984 if (out) 985 sgs[out_num++] = out; 986 987 /* Add return status. */ 988 sg_init_one(&stat, &status, sizeof(status)); 989 sgs[out_num] = &stat; 990 991 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 992 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 993 994 if (unlikely(!virtqueue_kick(vi->cvq))) 995 return status == VIRTIO_NET_OK; 996 997 /* Spin for a response, the kick causes an ioport write, trapping 998 * into the hypervisor, so the request should be handled immediately. 999 */ 1000 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1001 !virtqueue_is_broken(vi->cvq)) 1002 cpu_relax(); 1003 1004 return status == VIRTIO_NET_OK; 1005 } 1006 1007 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1008 { 1009 struct virtnet_info *vi = netdev_priv(dev); 1010 struct virtio_device *vdev = vi->vdev; 1011 int ret; 1012 struct sockaddr *addr = p; 1013 struct scatterlist sg; 1014 1015 ret = eth_prepare_mac_addr_change(dev, p); 1016 if (ret) 1017 return ret; 1018 1019 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1020 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1021 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1022 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1023 dev_warn(&vdev->dev, 1024 "Failed to set mac address by vq command.\n"); 1025 return -EINVAL; 1026 } 1027 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1028 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1029 unsigned int i; 1030 1031 /* Naturally, this has an atomicity problem. */ 1032 for (i = 0; i < dev->addr_len; i++) 1033 virtio_cwrite8(vdev, 1034 offsetof(struct virtio_net_config, mac) + 1035 i, addr->sa_data[i]); 1036 } 1037 1038 eth_commit_mac_addr_change(dev, p); 1039 1040 return 0; 1041 } 1042 1043 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1044 struct rtnl_link_stats64 *tot) 1045 { 1046 struct virtnet_info *vi = netdev_priv(dev); 1047 int cpu; 1048 unsigned int start; 1049 1050 for_each_possible_cpu(cpu) { 1051 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1052 u64 tpackets, tbytes, rpackets, rbytes; 1053 1054 do { 1055 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1056 tpackets = stats->tx_packets; 1057 tbytes = stats->tx_bytes; 1058 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1059 1060 do { 1061 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1062 rpackets = stats->rx_packets; 1063 rbytes = stats->rx_bytes; 1064 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1065 1066 tot->rx_packets += rpackets; 1067 tot->tx_packets += tpackets; 1068 tot->rx_bytes += rbytes; 1069 tot->tx_bytes += tbytes; 1070 } 1071 1072 tot->tx_dropped = dev->stats.tx_dropped; 1073 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1074 tot->rx_dropped = dev->stats.rx_dropped; 1075 tot->rx_length_errors = dev->stats.rx_length_errors; 1076 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1077 1078 return tot; 1079 } 1080 1081 #ifdef CONFIG_NET_POLL_CONTROLLER 1082 static void virtnet_netpoll(struct net_device *dev) 1083 { 1084 struct virtnet_info *vi = netdev_priv(dev); 1085 int i; 1086 1087 for (i = 0; i < vi->curr_queue_pairs; i++) 1088 napi_schedule(&vi->rq[i].napi); 1089 } 1090 #endif 1091 1092 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1093 { 1094 rtnl_lock(); 1095 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1096 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1097 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1098 rtnl_unlock(); 1099 } 1100 1101 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1102 { 1103 struct scatterlist sg; 1104 struct virtio_net_ctrl_mq s; 1105 struct net_device *dev = vi->dev; 1106 1107 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1108 return 0; 1109 1110 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1111 sg_init_one(&sg, &s, sizeof(s)); 1112 1113 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1114 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1115 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1116 queue_pairs); 1117 return -EINVAL; 1118 } else { 1119 vi->curr_queue_pairs = queue_pairs; 1120 /* virtnet_open() will refill when device is going to up. */ 1121 if (dev->flags & IFF_UP) 1122 schedule_delayed_work(&vi->refill, 0); 1123 } 1124 1125 return 0; 1126 } 1127 1128 static int virtnet_close(struct net_device *dev) 1129 { 1130 struct virtnet_info *vi = netdev_priv(dev); 1131 int i; 1132 1133 /* Make sure refill_work doesn't re-enable napi! */ 1134 cancel_delayed_work_sync(&vi->refill); 1135 1136 for (i = 0; i < vi->max_queue_pairs; i++) 1137 napi_disable(&vi->rq[i].napi); 1138 1139 return 0; 1140 } 1141 1142 static void virtnet_set_rx_mode(struct net_device *dev) 1143 { 1144 struct virtnet_info *vi = netdev_priv(dev); 1145 struct scatterlist sg[2]; 1146 u8 promisc, allmulti; 1147 struct virtio_net_ctrl_mac *mac_data; 1148 struct netdev_hw_addr *ha; 1149 int uc_count; 1150 int mc_count; 1151 void *buf; 1152 int i; 1153 1154 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1155 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1156 return; 1157 1158 promisc = ((dev->flags & IFF_PROMISC) != 0); 1159 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1160 1161 sg_init_one(sg, &promisc, sizeof(promisc)); 1162 1163 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1164 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1165 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1166 promisc ? "en" : "dis"); 1167 1168 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1169 1170 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1171 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1172 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1173 allmulti ? "en" : "dis"); 1174 1175 uc_count = netdev_uc_count(dev); 1176 mc_count = netdev_mc_count(dev); 1177 /* MAC filter - use one buffer for both lists */ 1178 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1179 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1180 mac_data = buf; 1181 if (!buf) 1182 return; 1183 1184 sg_init_table(sg, 2); 1185 1186 /* Store the unicast list and count in the front of the buffer */ 1187 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1188 i = 0; 1189 netdev_for_each_uc_addr(ha, dev) 1190 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1191 1192 sg_set_buf(&sg[0], mac_data, 1193 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1194 1195 /* multicast list and count fill the end */ 1196 mac_data = (void *)&mac_data->macs[uc_count][0]; 1197 1198 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1199 i = 0; 1200 netdev_for_each_mc_addr(ha, dev) 1201 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1202 1203 sg_set_buf(&sg[1], mac_data, 1204 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1205 1206 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1207 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1208 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1209 1210 kfree(buf); 1211 } 1212 1213 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1214 __be16 proto, u16 vid) 1215 { 1216 struct virtnet_info *vi = netdev_priv(dev); 1217 struct scatterlist sg; 1218 1219 sg_init_one(&sg, &vid, sizeof(vid)); 1220 1221 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1222 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1223 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1224 return 0; 1225 } 1226 1227 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1228 __be16 proto, u16 vid) 1229 { 1230 struct virtnet_info *vi = netdev_priv(dev); 1231 struct scatterlist sg; 1232 1233 sg_init_one(&sg, &vid, sizeof(vid)); 1234 1235 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1236 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1237 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1238 return 0; 1239 } 1240 1241 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1242 { 1243 int i; 1244 1245 if (vi->affinity_hint_set) { 1246 for (i = 0; i < vi->max_queue_pairs; i++) { 1247 virtqueue_set_affinity(vi->rq[i].vq, -1); 1248 virtqueue_set_affinity(vi->sq[i].vq, -1); 1249 } 1250 1251 vi->affinity_hint_set = false; 1252 } 1253 } 1254 1255 static void virtnet_set_affinity(struct virtnet_info *vi) 1256 { 1257 int i; 1258 int cpu; 1259 1260 /* In multiqueue mode, when the number of cpu is equal to the number of 1261 * queue pairs, we let the queue pairs to be private to one cpu by 1262 * setting the affinity hint to eliminate the contention. 1263 */ 1264 if (vi->curr_queue_pairs == 1 || 1265 vi->max_queue_pairs != num_online_cpus()) { 1266 virtnet_clean_affinity(vi, -1); 1267 return; 1268 } 1269 1270 i = 0; 1271 for_each_online_cpu(cpu) { 1272 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1273 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1274 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1275 i++; 1276 } 1277 1278 vi->affinity_hint_set = true; 1279 } 1280 1281 static int virtnet_cpu_callback(struct notifier_block *nfb, 1282 unsigned long action, void *hcpu) 1283 { 1284 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1285 1286 switch(action & ~CPU_TASKS_FROZEN) { 1287 case CPU_ONLINE: 1288 case CPU_DOWN_FAILED: 1289 case CPU_DEAD: 1290 virtnet_set_affinity(vi); 1291 break; 1292 case CPU_DOWN_PREPARE: 1293 virtnet_clean_affinity(vi, (long)hcpu); 1294 break; 1295 default: 1296 break; 1297 } 1298 1299 return NOTIFY_OK; 1300 } 1301 1302 static void virtnet_get_ringparam(struct net_device *dev, 1303 struct ethtool_ringparam *ring) 1304 { 1305 struct virtnet_info *vi = netdev_priv(dev); 1306 1307 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1308 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1309 ring->rx_pending = ring->rx_max_pending; 1310 ring->tx_pending = ring->tx_max_pending; 1311 } 1312 1313 1314 static void virtnet_get_drvinfo(struct net_device *dev, 1315 struct ethtool_drvinfo *info) 1316 { 1317 struct virtnet_info *vi = netdev_priv(dev); 1318 struct virtio_device *vdev = vi->vdev; 1319 1320 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1321 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1322 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1323 1324 } 1325 1326 /* TODO: Eliminate OOO packets during switching */ 1327 static int virtnet_set_channels(struct net_device *dev, 1328 struct ethtool_channels *channels) 1329 { 1330 struct virtnet_info *vi = netdev_priv(dev); 1331 u16 queue_pairs = channels->combined_count; 1332 int err; 1333 1334 /* We don't support separate rx/tx channels. 1335 * We don't allow setting 'other' channels. 1336 */ 1337 if (channels->rx_count || channels->tx_count || channels->other_count) 1338 return -EINVAL; 1339 1340 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1341 return -EINVAL; 1342 1343 get_online_cpus(); 1344 err = virtnet_set_queues(vi, queue_pairs); 1345 if (!err) { 1346 netif_set_real_num_tx_queues(dev, queue_pairs); 1347 netif_set_real_num_rx_queues(dev, queue_pairs); 1348 1349 virtnet_set_affinity(vi); 1350 } 1351 put_online_cpus(); 1352 1353 return err; 1354 } 1355 1356 static void virtnet_get_channels(struct net_device *dev, 1357 struct ethtool_channels *channels) 1358 { 1359 struct virtnet_info *vi = netdev_priv(dev); 1360 1361 channels->combined_count = vi->curr_queue_pairs; 1362 channels->max_combined = vi->max_queue_pairs; 1363 channels->max_other = 0; 1364 channels->rx_count = 0; 1365 channels->tx_count = 0; 1366 channels->other_count = 0; 1367 } 1368 1369 static const struct ethtool_ops virtnet_ethtool_ops = { 1370 .get_drvinfo = virtnet_get_drvinfo, 1371 .get_link = ethtool_op_get_link, 1372 .get_ringparam = virtnet_get_ringparam, 1373 .set_channels = virtnet_set_channels, 1374 .get_channels = virtnet_get_channels, 1375 .get_ts_info = ethtool_op_get_ts_info, 1376 }; 1377 1378 #define MIN_MTU 68 1379 #define MAX_MTU 65535 1380 1381 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1382 { 1383 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1384 return -EINVAL; 1385 dev->mtu = new_mtu; 1386 return 0; 1387 } 1388 1389 static const struct net_device_ops virtnet_netdev = { 1390 .ndo_open = virtnet_open, 1391 .ndo_stop = virtnet_close, 1392 .ndo_start_xmit = start_xmit, 1393 .ndo_validate_addr = eth_validate_addr, 1394 .ndo_set_mac_address = virtnet_set_mac_address, 1395 .ndo_set_rx_mode = virtnet_set_rx_mode, 1396 .ndo_change_mtu = virtnet_change_mtu, 1397 .ndo_get_stats64 = virtnet_stats, 1398 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1399 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1400 #ifdef CONFIG_NET_POLL_CONTROLLER 1401 .ndo_poll_controller = virtnet_netpoll, 1402 #endif 1403 #ifdef CONFIG_NET_RX_BUSY_POLL 1404 .ndo_busy_poll = virtnet_busy_poll, 1405 #endif 1406 }; 1407 1408 static void virtnet_config_changed_work(struct work_struct *work) 1409 { 1410 struct virtnet_info *vi = 1411 container_of(work, struct virtnet_info, config_work); 1412 u16 v; 1413 1414 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1415 struct virtio_net_config, status, &v) < 0) 1416 return; 1417 1418 if (v & VIRTIO_NET_S_ANNOUNCE) { 1419 netdev_notify_peers(vi->dev); 1420 virtnet_ack_link_announce(vi); 1421 } 1422 1423 /* Ignore unknown (future) status bits */ 1424 v &= VIRTIO_NET_S_LINK_UP; 1425 1426 if (vi->status == v) 1427 return; 1428 1429 vi->status = v; 1430 1431 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1432 netif_carrier_on(vi->dev); 1433 netif_tx_wake_all_queues(vi->dev); 1434 } else { 1435 netif_carrier_off(vi->dev); 1436 netif_tx_stop_all_queues(vi->dev); 1437 } 1438 } 1439 1440 static void virtnet_config_changed(struct virtio_device *vdev) 1441 { 1442 struct virtnet_info *vi = vdev->priv; 1443 1444 schedule_work(&vi->config_work); 1445 } 1446 1447 static void virtnet_free_queues(struct virtnet_info *vi) 1448 { 1449 int i; 1450 1451 for (i = 0; i < vi->max_queue_pairs; i++) { 1452 napi_hash_del(&vi->rq[i].napi); 1453 netif_napi_del(&vi->rq[i].napi); 1454 } 1455 1456 kfree(vi->rq); 1457 kfree(vi->sq); 1458 } 1459 1460 static void free_receive_bufs(struct virtnet_info *vi) 1461 { 1462 int i; 1463 1464 for (i = 0; i < vi->max_queue_pairs; i++) { 1465 while (vi->rq[i].pages) 1466 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1467 } 1468 } 1469 1470 static void free_receive_page_frags(struct virtnet_info *vi) 1471 { 1472 int i; 1473 for (i = 0; i < vi->max_queue_pairs; i++) 1474 if (vi->rq[i].alloc_frag.page) 1475 put_page(vi->rq[i].alloc_frag.page); 1476 } 1477 1478 static void free_unused_bufs(struct virtnet_info *vi) 1479 { 1480 void *buf; 1481 int i; 1482 1483 for (i = 0; i < vi->max_queue_pairs; i++) { 1484 struct virtqueue *vq = vi->sq[i].vq; 1485 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1486 dev_kfree_skb(buf); 1487 } 1488 1489 for (i = 0; i < vi->max_queue_pairs; i++) { 1490 struct virtqueue *vq = vi->rq[i].vq; 1491 1492 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1493 if (vi->mergeable_rx_bufs) { 1494 unsigned long ctx = (unsigned long)buf; 1495 void *base = mergeable_ctx_to_buf_address(ctx); 1496 put_page(virt_to_head_page(base)); 1497 } else if (vi->big_packets) { 1498 give_pages(&vi->rq[i], buf); 1499 } else { 1500 dev_kfree_skb(buf); 1501 } 1502 } 1503 } 1504 } 1505 1506 static void virtnet_del_vqs(struct virtnet_info *vi) 1507 { 1508 struct virtio_device *vdev = vi->vdev; 1509 1510 virtnet_clean_affinity(vi, -1); 1511 1512 vdev->config->del_vqs(vdev); 1513 1514 virtnet_free_queues(vi); 1515 } 1516 1517 static int virtnet_find_vqs(struct virtnet_info *vi) 1518 { 1519 vq_callback_t **callbacks; 1520 struct virtqueue **vqs; 1521 int ret = -ENOMEM; 1522 int i, total_vqs; 1523 const char **names; 1524 1525 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1526 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1527 * possible control vq. 1528 */ 1529 total_vqs = vi->max_queue_pairs * 2 + 1530 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1531 1532 /* Allocate space for find_vqs parameters */ 1533 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1534 if (!vqs) 1535 goto err_vq; 1536 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1537 if (!callbacks) 1538 goto err_callback; 1539 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1540 if (!names) 1541 goto err_names; 1542 1543 /* Parameters for control virtqueue, if any */ 1544 if (vi->has_cvq) { 1545 callbacks[total_vqs - 1] = NULL; 1546 names[total_vqs - 1] = "control"; 1547 } 1548 1549 /* Allocate/initialize parameters for send/receive virtqueues */ 1550 for (i = 0; i < vi->max_queue_pairs; i++) { 1551 callbacks[rxq2vq(i)] = skb_recv_done; 1552 callbacks[txq2vq(i)] = skb_xmit_done; 1553 sprintf(vi->rq[i].name, "input.%d", i); 1554 sprintf(vi->sq[i].name, "output.%d", i); 1555 names[rxq2vq(i)] = vi->rq[i].name; 1556 names[txq2vq(i)] = vi->sq[i].name; 1557 } 1558 1559 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1560 names); 1561 if (ret) 1562 goto err_find; 1563 1564 if (vi->has_cvq) { 1565 vi->cvq = vqs[total_vqs - 1]; 1566 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1567 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1568 } 1569 1570 for (i = 0; i < vi->max_queue_pairs; i++) { 1571 vi->rq[i].vq = vqs[rxq2vq(i)]; 1572 vi->sq[i].vq = vqs[txq2vq(i)]; 1573 } 1574 1575 kfree(names); 1576 kfree(callbacks); 1577 kfree(vqs); 1578 1579 return 0; 1580 1581 err_find: 1582 kfree(names); 1583 err_names: 1584 kfree(callbacks); 1585 err_callback: 1586 kfree(vqs); 1587 err_vq: 1588 return ret; 1589 } 1590 1591 static int virtnet_alloc_queues(struct virtnet_info *vi) 1592 { 1593 int i; 1594 1595 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1596 if (!vi->sq) 1597 goto err_sq; 1598 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1599 if (!vi->rq) 1600 goto err_rq; 1601 1602 INIT_DELAYED_WORK(&vi->refill, refill_work); 1603 for (i = 0; i < vi->max_queue_pairs; i++) { 1604 vi->rq[i].pages = NULL; 1605 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1606 napi_weight); 1607 napi_hash_add(&vi->rq[i].napi); 1608 1609 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1610 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1611 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1612 } 1613 1614 return 0; 1615 1616 err_rq: 1617 kfree(vi->sq); 1618 err_sq: 1619 return -ENOMEM; 1620 } 1621 1622 static int init_vqs(struct virtnet_info *vi) 1623 { 1624 int ret; 1625 1626 /* Allocate send & receive queues */ 1627 ret = virtnet_alloc_queues(vi); 1628 if (ret) 1629 goto err; 1630 1631 ret = virtnet_find_vqs(vi); 1632 if (ret) 1633 goto err_free; 1634 1635 get_online_cpus(); 1636 virtnet_set_affinity(vi); 1637 put_online_cpus(); 1638 1639 return 0; 1640 1641 err_free: 1642 virtnet_free_queues(vi); 1643 err: 1644 return ret; 1645 } 1646 1647 #ifdef CONFIG_SYSFS 1648 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1649 struct rx_queue_attribute *attribute, char *buf) 1650 { 1651 struct virtnet_info *vi = netdev_priv(queue->dev); 1652 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1653 struct ewma *avg; 1654 1655 BUG_ON(queue_index >= vi->max_queue_pairs); 1656 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1657 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1658 } 1659 1660 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1661 __ATTR_RO(mergeable_rx_buffer_size); 1662 1663 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1664 &mergeable_rx_buffer_size_attribute.attr, 1665 NULL 1666 }; 1667 1668 static const struct attribute_group virtio_net_mrg_rx_group = { 1669 .name = "virtio_net", 1670 .attrs = virtio_net_mrg_rx_attrs 1671 }; 1672 #endif 1673 1674 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 1675 unsigned int fbit, 1676 const char *fname, const char *dname) 1677 { 1678 if (!virtio_has_feature(vdev, fbit)) 1679 return false; 1680 1681 dev_err(&vdev->dev, "device advertises feature %s but not %s", 1682 fname, dname); 1683 1684 return true; 1685 } 1686 1687 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 1688 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 1689 1690 static bool virtnet_validate_features(struct virtio_device *vdev) 1691 { 1692 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 1693 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 1694 "VIRTIO_NET_F_CTRL_VQ") || 1695 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 1696 "VIRTIO_NET_F_CTRL_VQ") || 1697 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 1698 "VIRTIO_NET_F_CTRL_VQ") || 1699 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 1700 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 1701 "VIRTIO_NET_F_CTRL_VQ"))) { 1702 return false; 1703 } 1704 1705 return true; 1706 } 1707 1708 static int virtnet_probe(struct virtio_device *vdev) 1709 { 1710 int i, err; 1711 struct net_device *dev; 1712 struct virtnet_info *vi; 1713 u16 max_queue_pairs; 1714 1715 if (!vdev->config->get) { 1716 dev_err(&vdev->dev, "%s failure: config access disabled\n", 1717 __func__); 1718 return -EINVAL; 1719 } 1720 1721 if (!virtnet_validate_features(vdev)) 1722 return -EINVAL; 1723 1724 /* Find if host supports multiqueue virtio_net device */ 1725 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1726 struct virtio_net_config, 1727 max_virtqueue_pairs, &max_queue_pairs); 1728 1729 /* We need at least 2 queue's */ 1730 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1731 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1732 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1733 max_queue_pairs = 1; 1734 1735 /* Allocate ourselves a network device with room for our info */ 1736 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1737 if (!dev) 1738 return -ENOMEM; 1739 1740 /* Set up network device as normal. */ 1741 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1742 dev->netdev_ops = &virtnet_netdev; 1743 dev->features = NETIF_F_HIGHDMA; 1744 1745 dev->ethtool_ops = &virtnet_ethtool_ops; 1746 SET_NETDEV_DEV(dev, &vdev->dev); 1747 1748 /* Do we support "hardware" checksums? */ 1749 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1750 /* This opens up the world of extra features. */ 1751 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1752 if (csum) 1753 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1754 1755 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1756 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1757 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1758 } 1759 /* Individual feature bits: what can host handle? */ 1760 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1761 dev->hw_features |= NETIF_F_TSO; 1762 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1763 dev->hw_features |= NETIF_F_TSO6; 1764 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1765 dev->hw_features |= NETIF_F_TSO_ECN; 1766 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1767 dev->hw_features |= NETIF_F_UFO; 1768 1769 dev->features |= NETIF_F_GSO_ROBUST; 1770 1771 if (gso) 1772 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1773 /* (!csum && gso) case will be fixed by register_netdev() */ 1774 } 1775 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1776 dev->features |= NETIF_F_RXCSUM; 1777 1778 dev->vlan_features = dev->features; 1779 1780 /* Configuration may specify what MAC to use. Otherwise random. */ 1781 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1782 virtio_cread_bytes(vdev, 1783 offsetof(struct virtio_net_config, mac), 1784 dev->dev_addr, dev->addr_len); 1785 else 1786 eth_hw_addr_random(dev); 1787 1788 /* Set up our device-specific information */ 1789 vi = netdev_priv(dev); 1790 vi->dev = dev; 1791 vi->vdev = vdev; 1792 vdev->priv = vi; 1793 vi->stats = alloc_percpu(struct virtnet_stats); 1794 err = -ENOMEM; 1795 if (vi->stats == NULL) 1796 goto free; 1797 1798 for_each_possible_cpu(i) { 1799 struct virtnet_stats *virtnet_stats; 1800 virtnet_stats = per_cpu_ptr(vi->stats, i); 1801 u64_stats_init(&virtnet_stats->tx_syncp); 1802 u64_stats_init(&virtnet_stats->rx_syncp); 1803 } 1804 1805 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1806 1807 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1808 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1809 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1810 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 1811 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 1812 vi->big_packets = true; 1813 1814 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1815 vi->mergeable_rx_bufs = true; 1816 1817 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 1818 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 1819 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1820 else 1821 vi->hdr_len = sizeof(struct virtio_net_hdr); 1822 1823 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1824 vi->any_header_sg = true; 1825 1826 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1827 vi->has_cvq = true; 1828 1829 if (vi->any_header_sg) 1830 dev->needed_headroom = vi->hdr_len; 1831 1832 /* Use single tx/rx queue pair as default */ 1833 vi->curr_queue_pairs = 1; 1834 vi->max_queue_pairs = max_queue_pairs; 1835 1836 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1837 err = init_vqs(vi); 1838 if (err) 1839 goto free_stats; 1840 1841 #ifdef CONFIG_SYSFS 1842 if (vi->mergeable_rx_bufs) 1843 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1844 #endif 1845 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1846 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1847 1848 err = register_netdev(dev); 1849 if (err) { 1850 pr_debug("virtio_net: registering device failed\n"); 1851 goto free_vqs; 1852 } 1853 1854 virtio_device_ready(vdev); 1855 1856 /* Last of all, set up some receive buffers. */ 1857 for (i = 0; i < vi->curr_queue_pairs; i++) { 1858 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); 1859 1860 /* If we didn't even get one input buffer, we're useless. */ 1861 if (vi->rq[i].vq->num_free == 1862 virtqueue_get_vring_size(vi->rq[i].vq)) { 1863 free_unused_bufs(vi); 1864 err = -ENOMEM; 1865 goto free_recv_bufs; 1866 } 1867 } 1868 1869 vi->nb.notifier_call = &virtnet_cpu_callback; 1870 err = register_hotcpu_notifier(&vi->nb); 1871 if (err) { 1872 pr_debug("virtio_net: registering cpu notifier failed\n"); 1873 goto free_recv_bufs; 1874 } 1875 1876 /* Assume link up if device can't report link status, 1877 otherwise get link status from config. */ 1878 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1879 netif_carrier_off(dev); 1880 schedule_work(&vi->config_work); 1881 } else { 1882 vi->status = VIRTIO_NET_S_LINK_UP; 1883 netif_carrier_on(dev); 1884 } 1885 1886 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1887 dev->name, max_queue_pairs); 1888 1889 return 0; 1890 1891 free_recv_bufs: 1892 vi->vdev->config->reset(vdev); 1893 1894 free_receive_bufs(vi); 1895 unregister_netdev(dev); 1896 free_vqs: 1897 cancel_delayed_work_sync(&vi->refill); 1898 free_receive_page_frags(vi); 1899 virtnet_del_vqs(vi); 1900 free_stats: 1901 free_percpu(vi->stats); 1902 free: 1903 free_netdev(dev); 1904 return err; 1905 } 1906 1907 static void remove_vq_common(struct virtnet_info *vi) 1908 { 1909 vi->vdev->config->reset(vi->vdev); 1910 1911 /* Free unused buffers in both send and recv, if any. */ 1912 free_unused_bufs(vi); 1913 1914 free_receive_bufs(vi); 1915 1916 free_receive_page_frags(vi); 1917 1918 virtnet_del_vqs(vi); 1919 } 1920 1921 static void virtnet_remove(struct virtio_device *vdev) 1922 { 1923 struct virtnet_info *vi = vdev->priv; 1924 1925 unregister_hotcpu_notifier(&vi->nb); 1926 1927 /* Make sure no work handler is accessing the device. */ 1928 flush_work(&vi->config_work); 1929 1930 unregister_netdev(vi->dev); 1931 1932 remove_vq_common(vi); 1933 1934 free_percpu(vi->stats); 1935 free_netdev(vi->dev); 1936 } 1937 1938 #ifdef CONFIG_PM_SLEEP 1939 static int virtnet_freeze(struct virtio_device *vdev) 1940 { 1941 struct virtnet_info *vi = vdev->priv; 1942 int i; 1943 1944 unregister_hotcpu_notifier(&vi->nb); 1945 1946 /* Make sure no work handler is accessing the device */ 1947 flush_work(&vi->config_work); 1948 1949 netif_device_detach(vi->dev); 1950 cancel_delayed_work_sync(&vi->refill); 1951 1952 if (netif_running(vi->dev)) { 1953 for (i = 0; i < vi->max_queue_pairs; i++) 1954 napi_disable(&vi->rq[i].napi); 1955 } 1956 1957 remove_vq_common(vi); 1958 1959 return 0; 1960 } 1961 1962 static int virtnet_restore(struct virtio_device *vdev) 1963 { 1964 struct virtnet_info *vi = vdev->priv; 1965 int err, i; 1966 1967 err = init_vqs(vi); 1968 if (err) 1969 return err; 1970 1971 virtio_device_ready(vdev); 1972 1973 if (netif_running(vi->dev)) { 1974 for (i = 0; i < vi->curr_queue_pairs; i++) 1975 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1976 schedule_delayed_work(&vi->refill, 0); 1977 1978 for (i = 0; i < vi->max_queue_pairs; i++) 1979 virtnet_napi_enable(&vi->rq[i]); 1980 } 1981 1982 netif_device_attach(vi->dev); 1983 1984 rtnl_lock(); 1985 virtnet_set_queues(vi, vi->curr_queue_pairs); 1986 rtnl_unlock(); 1987 1988 err = register_hotcpu_notifier(&vi->nb); 1989 if (err) 1990 return err; 1991 1992 return 0; 1993 } 1994 #endif 1995 1996 static struct virtio_device_id id_table[] = { 1997 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1998 { 0 }, 1999 }; 2000 2001 static unsigned int features[] = { 2002 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 2003 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 2004 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 2005 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 2006 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 2007 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 2008 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 2009 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 2010 VIRTIO_NET_F_CTRL_MAC_ADDR, 2011 VIRTIO_F_ANY_LAYOUT, 2012 }; 2013 2014 static struct virtio_driver virtio_net_driver = { 2015 .feature_table = features, 2016 .feature_table_size = ARRAY_SIZE(features), 2017 .driver.name = KBUILD_MODNAME, 2018 .driver.owner = THIS_MODULE, 2019 .id_table = id_table, 2020 .probe = virtnet_probe, 2021 .remove = virtnet_remove, 2022 .config_changed = virtnet_config_changed, 2023 #ifdef CONFIG_PM_SLEEP 2024 .freeze = virtnet_freeze, 2025 .restore = virtnet_restore, 2026 #endif 2027 }; 2028 2029 module_virtio_driver(virtio_net_driver); 2030 2031 MODULE_DEVICE_TABLE(virtio, id_table); 2032 MODULE_DESCRIPTION("Virtio network driver"); 2033 MODULE_LICENSE("GPL"); 2034