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 /* RX packet size EWMA. The average packet size is used to determine the packet 44 * buffer size when refilling RX rings. As the entire RX ring may be refilled 45 * at once, the weight is chosen so that the EWMA will be insensitive to short- 46 * term, transient changes in packet size. 47 */ 48 DECLARE_EWMA(pkt_len, 1, 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.$index */ 74 char name[40]; 75 }; 76 77 /* Internal representation of a receive virtqueue */ 78 struct receive_queue { 79 /* Virtqueue associated with this receive_queue */ 80 struct virtqueue *vq; 81 82 struct napi_struct napi; 83 84 /* Chain pages by the private ptr. */ 85 struct page *pages; 86 87 /* Average packet length for mergeable receive buffers. */ 88 struct ewma_pkt_len mrg_avg_pkt_len; 89 90 /* Page frag for packet buffer allocation. */ 91 struct page_frag alloc_frag; 92 93 /* RX: fragments + linear part + virtio header */ 94 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 95 96 /* Name of this receive queue: input.$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_pkt_len_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 napi_gro_receive(&rq->napi, 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, 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_pkt_len *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_pkt_len_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; 753 754 received = virtnet_receive(rq, budget); 755 756 /* Out of packets? */ 757 if (received < budget) { 758 r = virtqueue_enable_cb_prepare(rq->vq); 759 napi_complete_done(napi, received); 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, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 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 /* If running out of space, stop queue to avoid getting packets that we 943 * are then unable to transmit. 944 * An alternative would be to force queuing layer to requeue the skb by 945 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 946 * returned in a normal path of operation: it means that driver is not 947 * maintaining the TX queue stop/start state properly, and causes 948 * the stack to do a non-trivial amount of useless work. 949 * Since most packets only take 1 or 2 ring slots, stopping the queue 950 * early means 16 slots are typically wasted. 951 */ 952 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 953 netif_stop_subqueue(dev, qnum); 954 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 955 /* More just got used, free them then recheck. */ 956 free_old_xmit_skbs(sq); 957 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 958 netif_start_subqueue(dev, qnum); 959 virtqueue_disable_cb(sq->vq); 960 } 961 } 962 } 963 964 if (kick || netif_xmit_stopped(txq)) 965 virtqueue_kick(sq->vq); 966 967 return NETDEV_TX_OK; 968 } 969 970 /* 971 * Send command via the control virtqueue and check status. Commands 972 * supported by the hypervisor, as indicated by feature bits, should 973 * never fail unless improperly formatted. 974 */ 975 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 976 struct scatterlist *out) 977 { 978 struct scatterlist *sgs[4], hdr, stat; 979 struct virtio_net_ctrl_hdr ctrl; 980 virtio_net_ctrl_ack status = ~0; 981 unsigned out_num = 0, tmp; 982 983 /* Caller should know better */ 984 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 985 986 ctrl.class = class; 987 ctrl.cmd = cmd; 988 /* Add header */ 989 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 990 sgs[out_num++] = &hdr; 991 992 if (out) 993 sgs[out_num++] = out; 994 995 /* Add return status. */ 996 sg_init_one(&stat, &status, sizeof(status)); 997 sgs[out_num] = &stat; 998 999 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 1000 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 1001 1002 if (unlikely(!virtqueue_kick(vi->cvq))) 1003 return status == VIRTIO_NET_OK; 1004 1005 /* Spin for a response, the kick causes an ioport write, trapping 1006 * into the hypervisor, so the request should be handled immediately. 1007 */ 1008 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1009 !virtqueue_is_broken(vi->cvq)) 1010 cpu_relax(); 1011 1012 return status == VIRTIO_NET_OK; 1013 } 1014 1015 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1016 { 1017 struct virtnet_info *vi = netdev_priv(dev); 1018 struct virtio_device *vdev = vi->vdev; 1019 int ret; 1020 struct sockaddr *addr = p; 1021 struct scatterlist sg; 1022 1023 ret = eth_prepare_mac_addr_change(dev, p); 1024 if (ret) 1025 return ret; 1026 1027 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1028 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1029 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1030 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1031 dev_warn(&vdev->dev, 1032 "Failed to set mac address by vq command.\n"); 1033 return -EINVAL; 1034 } 1035 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1036 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1037 unsigned int i; 1038 1039 /* Naturally, this has an atomicity problem. */ 1040 for (i = 0; i < dev->addr_len; i++) 1041 virtio_cwrite8(vdev, 1042 offsetof(struct virtio_net_config, mac) + 1043 i, addr->sa_data[i]); 1044 } 1045 1046 eth_commit_mac_addr_change(dev, p); 1047 1048 return 0; 1049 } 1050 1051 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1052 struct rtnl_link_stats64 *tot) 1053 { 1054 struct virtnet_info *vi = netdev_priv(dev); 1055 int cpu; 1056 unsigned int start; 1057 1058 for_each_possible_cpu(cpu) { 1059 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1060 u64 tpackets, tbytes, rpackets, rbytes; 1061 1062 do { 1063 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1064 tpackets = stats->tx_packets; 1065 tbytes = stats->tx_bytes; 1066 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1067 1068 do { 1069 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1070 rpackets = stats->rx_packets; 1071 rbytes = stats->rx_bytes; 1072 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1073 1074 tot->rx_packets += rpackets; 1075 tot->tx_packets += tpackets; 1076 tot->rx_bytes += rbytes; 1077 tot->tx_bytes += tbytes; 1078 } 1079 1080 tot->tx_dropped = dev->stats.tx_dropped; 1081 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1082 tot->rx_dropped = dev->stats.rx_dropped; 1083 tot->rx_length_errors = dev->stats.rx_length_errors; 1084 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1085 1086 return tot; 1087 } 1088 1089 #ifdef CONFIG_NET_POLL_CONTROLLER 1090 static void virtnet_netpoll(struct net_device *dev) 1091 { 1092 struct virtnet_info *vi = netdev_priv(dev); 1093 int i; 1094 1095 for (i = 0; i < vi->curr_queue_pairs; i++) 1096 napi_schedule(&vi->rq[i].napi); 1097 } 1098 #endif 1099 1100 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1101 { 1102 rtnl_lock(); 1103 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1104 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1105 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1106 rtnl_unlock(); 1107 } 1108 1109 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1110 { 1111 struct scatterlist sg; 1112 struct virtio_net_ctrl_mq s; 1113 struct net_device *dev = vi->dev; 1114 1115 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1116 return 0; 1117 1118 s.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1119 sg_init_one(&sg, &s, sizeof(s)); 1120 1121 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1122 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1123 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1124 queue_pairs); 1125 return -EINVAL; 1126 } else { 1127 vi->curr_queue_pairs = queue_pairs; 1128 /* virtnet_open() will refill when device is going to up. */ 1129 if (dev->flags & IFF_UP) 1130 schedule_delayed_work(&vi->refill, 0); 1131 } 1132 1133 return 0; 1134 } 1135 1136 static int virtnet_close(struct net_device *dev) 1137 { 1138 struct virtnet_info *vi = netdev_priv(dev); 1139 int i; 1140 1141 /* Make sure refill_work doesn't re-enable napi! */ 1142 cancel_delayed_work_sync(&vi->refill); 1143 1144 for (i = 0; i < vi->max_queue_pairs; i++) 1145 napi_disable(&vi->rq[i].napi); 1146 1147 return 0; 1148 } 1149 1150 static void virtnet_set_rx_mode(struct net_device *dev) 1151 { 1152 struct virtnet_info *vi = netdev_priv(dev); 1153 struct scatterlist sg[2]; 1154 u8 promisc, allmulti; 1155 struct virtio_net_ctrl_mac *mac_data; 1156 struct netdev_hw_addr *ha; 1157 int uc_count; 1158 int mc_count; 1159 void *buf; 1160 int i; 1161 1162 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1163 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1164 return; 1165 1166 promisc = ((dev->flags & IFF_PROMISC) != 0); 1167 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1168 1169 sg_init_one(sg, &promisc, sizeof(promisc)); 1170 1171 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1172 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1173 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1174 promisc ? "en" : "dis"); 1175 1176 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1177 1178 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1179 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1180 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1181 allmulti ? "en" : "dis"); 1182 1183 uc_count = netdev_uc_count(dev); 1184 mc_count = netdev_mc_count(dev); 1185 /* MAC filter - use one buffer for both lists */ 1186 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1187 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1188 mac_data = buf; 1189 if (!buf) 1190 return; 1191 1192 sg_init_table(sg, 2); 1193 1194 /* Store the unicast list and count in the front of the buffer */ 1195 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1196 i = 0; 1197 netdev_for_each_uc_addr(ha, dev) 1198 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1199 1200 sg_set_buf(&sg[0], mac_data, 1201 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1202 1203 /* multicast list and count fill the end */ 1204 mac_data = (void *)&mac_data->macs[uc_count][0]; 1205 1206 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1207 i = 0; 1208 netdev_for_each_mc_addr(ha, dev) 1209 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1210 1211 sg_set_buf(&sg[1], mac_data, 1212 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1213 1214 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1215 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1216 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1217 1218 kfree(buf); 1219 } 1220 1221 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1222 __be16 proto, u16 vid) 1223 { 1224 struct virtnet_info *vi = netdev_priv(dev); 1225 struct scatterlist sg; 1226 1227 sg_init_one(&sg, &vid, sizeof(vid)); 1228 1229 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1230 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1231 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1232 return 0; 1233 } 1234 1235 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1236 __be16 proto, u16 vid) 1237 { 1238 struct virtnet_info *vi = netdev_priv(dev); 1239 struct scatterlist sg; 1240 1241 sg_init_one(&sg, &vid, sizeof(vid)); 1242 1243 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1244 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1245 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1246 return 0; 1247 } 1248 1249 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1250 { 1251 int i; 1252 1253 if (vi->affinity_hint_set) { 1254 for (i = 0; i < vi->max_queue_pairs; i++) { 1255 virtqueue_set_affinity(vi->rq[i].vq, -1); 1256 virtqueue_set_affinity(vi->sq[i].vq, -1); 1257 } 1258 1259 vi->affinity_hint_set = false; 1260 } 1261 } 1262 1263 static void virtnet_set_affinity(struct virtnet_info *vi) 1264 { 1265 int i; 1266 int cpu; 1267 1268 /* In multiqueue mode, when the number of cpu is equal to the number of 1269 * queue pairs, we let the queue pairs to be private to one cpu by 1270 * setting the affinity hint to eliminate the contention. 1271 */ 1272 if (vi->curr_queue_pairs == 1 || 1273 vi->max_queue_pairs != num_online_cpus()) { 1274 virtnet_clean_affinity(vi, -1); 1275 return; 1276 } 1277 1278 i = 0; 1279 for_each_online_cpu(cpu) { 1280 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1281 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1282 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1283 i++; 1284 } 1285 1286 vi->affinity_hint_set = true; 1287 } 1288 1289 static int virtnet_cpu_callback(struct notifier_block *nfb, 1290 unsigned long action, void *hcpu) 1291 { 1292 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1293 1294 switch(action & ~CPU_TASKS_FROZEN) { 1295 case CPU_ONLINE: 1296 case CPU_DOWN_FAILED: 1297 case CPU_DEAD: 1298 virtnet_set_affinity(vi); 1299 break; 1300 case CPU_DOWN_PREPARE: 1301 virtnet_clean_affinity(vi, (long)hcpu); 1302 break; 1303 default: 1304 break; 1305 } 1306 1307 return NOTIFY_OK; 1308 } 1309 1310 static void virtnet_get_ringparam(struct net_device *dev, 1311 struct ethtool_ringparam *ring) 1312 { 1313 struct virtnet_info *vi = netdev_priv(dev); 1314 1315 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1316 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1317 ring->rx_pending = ring->rx_max_pending; 1318 ring->tx_pending = ring->tx_max_pending; 1319 } 1320 1321 1322 static void virtnet_get_drvinfo(struct net_device *dev, 1323 struct ethtool_drvinfo *info) 1324 { 1325 struct virtnet_info *vi = netdev_priv(dev); 1326 struct virtio_device *vdev = vi->vdev; 1327 1328 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1329 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1330 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1331 1332 } 1333 1334 /* TODO: Eliminate OOO packets during switching */ 1335 static int virtnet_set_channels(struct net_device *dev, 1336 struct ethtool_channels *channels) 1337 { 1338 struct virtnet_info *vi = netdev_priv(dev); 1339 u16 queue_pairs = channels->combined_count; 1340 int err; 1341 1342 /* We don't support separate rx/tx channels. 1343 * We don't allow setting 'other' channels. 1344 */ 1345 if (channels->rx_count || channels->tx_count || channels->other_count) 1346 return -EINVAL; 1347 1348 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1349 return -EINVAL; 1350 1351 get_online_cpus(); 1352 err = virtnet_set_queues(vi, queue_pairs); 1353 if (!err) { 1354 netif_set_real_num_tx_queues(dev, queue_pairs); 1355 netif_set_real_num_rx_queues(dev, queue_pairs); 1356 1357 virtnet_set_affinity(vi); 1358 } 1359 put_online_cpus(); 1360 1361 return err; 1362 } 1363 1364 static void virtnet_get_channels(struct net_device *dev, 1365 struct ethtool_channels *channels) 1366 { 1367 struct virtnet_info *vi = netdev_priv(dev); 1368 1369 channels->combined_count = vi->curr_queue_pairs; 1370 channels->max_combined = vi->max_queue_pairs; 1371 channels->max_other = 0; 1372 channels->rx_count = 0; 1373 channels->tx_count = 0; 1374 channels->other_count = 0; 1375 } 1376 1377 static const struct ethtool_ops virtnet_ethtool_ops = { 1378 .get_drvinfo = virtnet_get_drvinfo, 1379 .get_link = ethtool_op_get_link, 1380 .get_ringparam = virtnet_get_ringparam, 1381 .set_channels = virtnet_set_channels, 1382 .get_channels = virtnet_get_channels, 1383 .get_ts_info = ethtool_op_get_ts_info, 1384 }; 1385 1386 #define MIN_MTU 68 1387 #define MAX_MTU 65535 1388 1389 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1390 { 1391 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1392 return -EINVAL; 1393 dev->mtu = new_mtu; 1394 return 0; 1395 } 1396 1397 static const struct net_device_ops virtnet_netdev = { 1398 .ndo_open = virtnet_open, 1399 .ndo_stop = virtnet_close, 1400 .ndo_start_xmit = start_xmit, 1401 .ndo_validate_addr = eth_validate_addr, 1402 .ndo_set_mac_address = virtnet_set_mac_address, 1403 .ndo_set_rx_mode = virtnet_set_rx_mode, 1404 .ndo_change_mtu = virtnet_change_mtu, 1405 .ndo_get_stats64 = virtnet_stats, 1406 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1407 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1408 #ifdef CONFIG_NET_POLL_CONTROLLER 1409 .ndo_poll_controller = virtnet_netpoll, 1410 #endif 1411 #ifdef CONFIG_NET_RX_BUSY_POLL 1412 .ndo_busy_poll = virtnet_busy_poll, 1413 #endif 1414 }; 1415 1416 static void virtnet_config_changed_work(struct work_struct *work) 1417 { 1418 struct virtnet_info *vi = 1419 container_of(work, struct virtnet_info, config_work); 1420 u16 v; 1421 1422 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1423 struct virtio_net_config, status, &v) < 0) 1424 return; 1425 1426 if (v & VIRTIO_NET_S_ANNOUNCE) { 1427 netdev_notify_peers(vi->dev); 1428 virtnet_ack_link_announce(vi); 1429 } 1430 1431 /* Ignore unknown (future) status bits */ 1432 v &= VIRTIO_NET_S_LINK_UP; 1433 1434 if (vi->status == v) 1435 return; 1436 1437 vi->status = v; 1438 1439 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1440 netif_carrier_on(vi->dev); 1441 netif_tx_wake_all_queues(vi->dev); 1442 } else { 1443 netif_carrier_off(vi->dev); 1444 netif_tx_stop_all_queues(vi->dev); 1445 } 1446 } 1447 1448 static void virtnet_config_changed(struct virtio_device *vdev) 1449 { 1450 struct virtnet_info *vi = vdev->priv; 1451 1452 schedule_work(&vi->config_work); 1453 } 1454 1455 static void virtnet_free_queues(struct virtnet_info *vi) 1456 { 1457 int i; 1458 1459 for (i = 0; i < vi->max_queue_pairs; i++) { 1460 napi_hash_del(&vi->rq[i].napi); 1461 netif_napi_del(&vi->rq[i].napi); 1462 } 1463 1464 kfree(vi->rq); 1465 kfree(vi->sq); 1466 } 1467 1468 static void free_receive_bufs(struct virtnet_info *vi) 1469 { 1470 int i; 1471 1472 for (i = 0; i < vi->max_queue_pairs; i++) { 1473 while (vi->rq[i].pages) 1474 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1475 } 1476 } 1477 1478 static void free_receive_page_frags(struct virtnet_info *vi) 1479 { 1480 int i; 1481 for (i = 0; i < vi->max_queue_pairs; i++) 1482 if (vi->rq[i].alloc_frag.page) 1483 put_page(vi->rq[i].alloc_frag.page); 1484 } 1485 1486 static void free_unused_bufs(struct virtnet_info *vi) 1487 { 1488 void *buf; 1489 int i; 1490 1491 for (i = 0; i < vi->max_queue_pairs; i++) { 1492 struct virtqueue *vq = vi->sq[i].vq; 1493 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1494 dev_kfree_skb(buf); 1495 } 1496 1497 for (i = 0; i < vi->max_queue_pairs; i++) { 1498 struct virtqueue *vq = vi->rq[i].vq; 1499 1500 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1501 if (vi->mergeable_rx_bufs) { 1502 unsigned long ctx = (unsigned long)buf; 1503 void *base = mergeable_ctx_to_buf_address(ctx); 1504 put_page(virt_to_head_page(base)); 1505 } else if (vi->big_packets) { 1506 give_pages(&vi->rq[i], buf); 1507 } else { 1508 dev_kfree_skb(buf); 1509 } 1510 } 1511 } 1512 } 1513 1514 static void virtnet_del_vqs(struct virtnet_info *vi) 1515 { 1516 struct virtio_device *vdev = vi->vdev; 1517 1518 virtnet_clean_affinity(vi, -1); 1519 1520 vdev->config->del_vqs(vdev); 1521 1522 virtnet_free_queues(vi); 1523 } 1524 1525 static int virtnet_find_vqs(struct virtnet_info *vi) 1526 { 1527 vq_callback_t **callbacks; 1528 struct virtqueue **vqs; 1529 int ret = -ENOMEM; 1530 int i, total_vqs; 1531 const char **names; 1532 1533 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1534 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1535 * possible control vq. 1536 */ 1537 total_vqs = vi->max_queue_pairs * 2 + 1538 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1539 1540 /* Allocate space for find_vqs parameters */ 1541 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1542 if (!vqs) 1543 goto err_vq; 1544 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1545 if (!callbacks) 1546 goto err_callback; 1547 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1548 if (!names) 1549 goto err_names; 1550 1551 /* Parameters for control virtqueue, if any */ 1552 if (vi->has_cvq) { 1553 callbacks[total_vqs - 1] = NULL; 1554 names[total_vqs - 1] = "control"; 1555 } 1556 1557 /* Allocate/initialize parameters for send/receive virtqueues */ 1558 for (i = 0; i < vi->max_queue_pairs; i++) { 1559 callbacks[rxq2vq(i)] = skb_recv_done; 1560 callbacks[txq2vq(i)] = skb_xmit_done; 1561 sprintf(vi->rq[i].name, "input.%d", i); 1562 sprintf(vi->sq[i].name, "output.%d", i); 1563 names[rxq2vq(i)] = vi->rq[i].name; 1564 names[txq2vq(i)] = vi->sq[i].name; 1565 } 1566 1567 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1568 names); 1569 if (ret) 1570 goto err_find; 1571 1572 if (vi->has_cvq) { 1573 vi->cvq = vqs[total_vqs - 1]; 1574 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1575 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1576 } 1577 1578 for (i = 0; i < vi->max_queue_pairs; i++) { 1579 vi->rq[i].vq = vqs[rxq2vq(i)]; 1580 vi->sq[i].vq = vqs[txq2vq(i)]; 1581 } 1582 1583 kfree(names); 1584 kfree(callbacks); 1585 kfree(vqs); 1586 1587 return 0; 1588 1589 err_find: 1590 kfree(names); 1591 err_names: 1592 kfree(callbacks); 1593 err_callback: 1594 kfree(vqs); 1595 err_vq: 1596 return ret; 1597 } 1598 1599 static int virtnet_alloc_queues(struct virtnet_info *vi) 1600 { 1601 int i; 1602 1603 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1604 if (!vi->sq) 1605 goto err_sq; 1606 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1607 if (!vi->rq) 1608 goto err_rq; 1609 1610 INIT_DELAYED_WORK(&vi->refill, refill_work); 1611 for (i = 0; i < vi->max_queue_pairs; i++) { 1612 vi->rq[i].pages = NULL; 1613 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1614 napi_weight); 1615 napi_hash_add(&vi->rq[i].napi); 1616 1617 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1618 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 1619 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1620 } 1621 1622 return 0; 1623 1624 err_rq: 1625 kfree(vi->sq); 1626 err_sq: 1627 return -ENOMEM; 1628 } 1629 1630 static int init_vqs(struct virtnet_info *vi) 1631 { 1632 int ret; 1633 1634 /* Allocate send & receive queues */ 1635 ret = virtnet_alloc_queues(vi); 1636 if (ret) 1637 goto err; 1638 1639 ret = virtnet_find_vqs(vi); 1640 if (ret) 1641 goto err_free; 1642 1643 get_online_cpus(); 1644 virtnet_set_affinity(vi); 1645 put_online_cpus(); 1646 1647 return 0; 1648 1649 err_free: 1650 virtnet_free_queues(vi); 1651 err: 1652 return ret; 1653 } 1654 1655 #ifdef CONFIG_SYSFS 1656 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1657 struct rx_queue_attribute *attribute, char *buf) 1658 { 1659 struct virtnet_info *vi = netdev_priv(queue->dev); 1660 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1661 struct ewma_pkt_len *avg; 1662 1663 BUG_ON(queue_index >= vi->max_queue_pairs); 1664 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1665 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1666 } 1667 1668 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1669 __ATTR_RO(mergeable_rx_buffer_size); 1670 1671 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1672 &mergeable_rx_buffer_size_attribute.attr, 1673 NULL 1674 }; 1675 1676 static const struct attribute_group virtio_net_mrg_rx_group = { 1677 .name = "virtio_net", 1678 .attrs = virtio_net_mrg_rx_attrs 1679 }; 1680 #endif 1681 1682 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 1683 unsigned int fbit, 1684 const char *fname, const char *dname) 1685 { 1686 if (!virtio_has_feature(vdev, fbit)) 1687 return false; 1688 1689 dev_err(&vdev->dev, "device advertises feature %s but not %s", 1690 fname, dname); 1691 1692 return true; 1693 } 1694 1695 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 1696 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 1697 1698 static bool virtnet_validate_features(struct virtio_device *vdev) 1699 { 1700 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 1701 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 1702 "VIRTIO_NET_F_CTRL_VQ") || 1703 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 1704 "VIRTIO_NET_F_CTRL_VQ") || 1705 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 1706 "VIRTIO_NET_F_CTRL_VQ") || 1707 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 1708 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 1709 "VIRTIO_NET_F_CTRL_VQ"))) { 1710 return false; 1711 } 1712 1713 return true; 1714 } 1715 1716 static int virtnet_probe(struct virtio_device *vdev) 1717 { 1718 int i, err; 1719 struct net_device *dev; 1720 struct virtnet_info *vi; 1721 u16 max_queue_pairs; 1722 1723 if (!vdev->config->get) { 1724 dev_err(&vdev->dev, "%s failure: config access disabled\n", 1725 __func__); 1726 return -EINVAL; 1727 } 1728 1729 if (!virtnet_validate_features(vdev)) 1730 return -EINVAL; 1731 1732 /* Find if host supports multiqueue virtio_net device */ 1733 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1734 struct virtio_net_config, 1735 max_virtqueue_pairs, &max_queue_pairs); 1736 1737 /* We need at least 2 queue's */ 1738 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1739 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1740 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1741 max_queue_pairs = 1; 1742 1743 /* Allocate ourselves a network device with room for our info */ 1744 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1745 if (!dev) 1746 return -ENOMEM; 1747 1748 /* Set up network device as normal. */ 1749 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1750 dev->netdev_ops = &virtnet_netdev; 1751 dev->features = NETIF_F_HIGHDMA; 1752 1753 dev->ethtool_ops = &virtnet_ethtool_ops; 1754 SET_NETDEV_DEV(dev, &vdev->dev); 1755 1756 /* Do we support "hardware" checksums? */ 1757 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1758 /* This opens up the world of extra features. */ 1759 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 1760 if (csum) 1761 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 1762 1763 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1764 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1765 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1766 } 1767 /* Individual feature bits: what can host handle? */ 1768 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1769 dev->hw_features |= NETIF_F_TSO; 1770 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1771 dev->hw_features |= NETIF_F_TSO6; 1772 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1773 dev->hw_features |= NETIF_F_TSO_ECN; 1774 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1775 dev->hw_features |= NETIF_F_UFO; 1776 1777 dev->features |= NETIF_F_GSO_ROBUST; 1778 1779 if (gso) 1780 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1781 /* (!csum && gso) case will be fixed by register_netdev() */ 1782 } 1783 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1784 dev->features |= NETIF_F_RXCSUM; 1785 1786 dev->vlan_features = dev->features; 1787 1788 /* Configuration may specify what MAC to use. Otherwise random. */ 1789 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1790 virtio_cread_bytes(vdev, 1791 offsetof(struct virtio_net_config, mac), 1792 dev->dev_addr, dev->addr_len); 1793 else 1794 eth_hw_addr_random(dev); 1795 1796 /* Set up our device-specific information */ 1797 vi = netdev_priv(dev); 1798 vi->dev = dev; 1799 vi->vdev = vdev; 1800 vdev->priv = vi; 1801 vi->stats = alloc_percpu(struct virtnet_stats); 1802 err = -ENOMEM; 1803 if (vi->stats == NULL) 1804 goto free; 1805 1806 for_each_possible_cpu(i) { 1807 struct virtnet_stats *virtnet_stats; 1808 virtnet_stats = per_cpu_ptr(vi->stats, i); 1809 u64_stats_init(&virtnet_stats->tx_syncp); 1810 u64_stats_init(&virtnet_stats->rx_syncp); 1811 } 1812 1813 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1814 1815 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1816 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1817 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1818 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 1819 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 1820 vi->big_packets = true; 1821 1822 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1823 vi->mergeable_rx_bufs = true; 1824 1825 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 1826 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 1827 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1828 else 1829 vi->hdr_len = sizeof(struct virtio_net_hdr); 1830 1831 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 1832 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 1833 vi->any_header_sg = true; 1834 1835 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1836 vi->has_cvq = true; 1837 1838 if (vi->any_header_sg) 1839 dev->needed_headroom = vi->hdr_len; 1840 1841 /* Use single tx/rx queue pair as default */ 1842 vi->curr_queue_pairs = 1; 1843 vi->max_queue_pairs = max_queue_pairs; 1844 1845 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1846 err = init_vqs(vi); 1847 if (err) 1848 goto free_stats; 1849 1850 #ifdef CONFIG_SYSFS 1851 if (vi->mergeable_rx_bufs) 1852 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1853 #endif 1854 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1855 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1856 1857 err = register_netdev(dev); 1858 if (err) { 1859 pr_debug("virtio_net: registering device failed\n"); 1860 goto free_vqs; 1861 } 1862 1863 virtio_device_ready(vdev); 1864 1865 /* Last of all, set up some receive buffers. */ 1866 for (i = 0; i < vi->curr_queue_pairs; i++) { 1867 try_fill_recv(vi, &vi->rq[i], GFP_KERNEL); 1868 1869 /* If we didn't even get one input buffer, we're useless. */ 1870 if (vi->rq[i].vq->num_free == 1871 virtqueue_get_vring_size(vi->rq[i].vq)) { 1872 free_unused_bufs(vi); 1873 err = -ENOMEM; 1874 goto free_recv_bufs; 1875 } 1876 } 1877 1878 vi->nb.notifier_call = &virtnet_cpu_callback; 1879 err = register_hotcpu_notifier(&vi->nb); 1880 if (err) { 1881 pr_debug("virtio_net: registering cpu notifier failed\n"); 1882 goto free_recv_bufs; 1883 } 1884 1885 /* Assume link up if device can't report link status, 1886 otherwise get link status from config. */ 1887 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1888 netif_carrier_off(dev); 1889 schedule_work(&vi->config_work); 1890 } else { 1891 vi->status = VIRTIO_NET_S_LINK_UP; 1892 netif_carrier_on(dev); 1893 } 1894 1895 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1896 dev->name, max_queue_pairs); 1897 1898 return 0; 1899 1900 free_recv_bufs: 1901 vi->vdev->config->reset(vdev); 1902 1903 free_receive_bufs(vi); 1904 unregister_netdev(dev); 1905 free_vqs: 1906 cancel_delayed_work_sync(&vi->refill); 1907 free_receive_page_frags(vi); 1908 virtnet_del_vqs(vi); 1909 free_stats: 1910 free_percpu(vi->stats); 1911 free: 1912 free_netdev(dev); 1913 return err; 1914 } 1915 1916 static void remove_vq_common(struct virtnet_info *vi) 1917 { 1918 vi->vdev->config->reset(vi->vdev); 1919 1920 /* Free unused buffers in both send and recv, if any. */ 1921 free_unused_bufs(vi); 1922 1923 free_receive_bufs(vi); 1924 1925 free_receive_page_frags(vi); 1926 1927 virtnet_del_vqs(vi); 1928 } 1929 1930 static void virtnet_remove(struct virtio_device *vdev) 1931 { 1932 struct virtnet_info *vi = vdev->priv; 1933 1934 unregister_hotcpu_notifier(&vi->nb); 1935 1936 /* Make sure no work handler is accessing the device. */ 1937 flush_work(&vi->config_work); 1938 1939 unregister_netdev(vi->dev); 1940 1941 remove_vq_common(vi); 1942 1943 free_percpu(vi->stats); 1944 free_netdev(vi->dev); 1945 } 1946 1947 #ifdef CONFIG_PM_SLEEP 1948 static int virtnet_freeze(struct virtio_device *vdev) 1949 { 1950 struct virtnet_info *vi = vdev->priv; 1951 int i; 1952 1953 unregister_hotcpu_notifier(&vi->nb); 1954 1955 /* Make sure no work handler is accessing the device */ 1956 flush_work(&vi->config_work); 1957 1958 netif_device_detach(vi->dev); 1959 cancel_delayed_work_sync(&vi->refill); 1960 1961 if (netif_running(vi->dev)) { 1962 for (i = 0; i < vi->max_queue_pairs; i++) 1963 napi_disable(&vi->rq[i].napi); 1964 } 1965 1966 remove_vq_common(vi); 1967 1968 return 0; 1969 } 1970 1971 static int virtnet_restore(struct virtio_device *vdev) 1972 { 1973 struct virtnet_info *vi = vdev->priv; 1974 int err, i; 1975 1976 err = init_vqs(vi); 1977 if (err) 1978 return err; 1979 1980 virtio_device_ready(vdev); 1981 1982 if (netif_running(vi->dev)) { 1983 for (i = 0; i < vi->curr_queue_pairs; i++) 1984 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1985 schedule_delayed_work(&vi->refill, 0); 1986 1987 for (i = 0; i < vi->max_queue_pairs; i++) 1988 virtnet_napi_enable(&vi->rq[i]); 1989 } 1990 1991 netif_device_attach(vi->dev); 1992 1993 rtnl_lock(); 1994 virtnet_set_queues(vi, vi->curr_queue_pairs); 1995 rtnl_unlock(); 1996 1997 err = register_hotcpu_notifier(&vi->nb); 1998 if (err) 1999 return err; 2000 2001 return 0; 2002 } 2003 #endif 2004 2005 static struct virtio_device_id id_table[] = { 2006 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 2007 { 0 }, 2008 }; 2009 2010 static unsigned int features[] = { 2011 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 2012 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 2013 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 2014 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 2015 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 2016 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 2017 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 2018 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 2019 VIRTIO_NET_F_CTRL_MAC_ADDR, 2020 VIRTIO_F_ANY_LAYOUT, 2021 }; 2022 2023 static struct virtio_driver virtio_net_driver = { 2024 .feature_table = features, 2025 .feature_table_size = ARRAY_SIZE(features), 2026 .driver.name = KBUILD_MODNAME, 2027 .driver.owner = THIS_MODULE, 2028 .id_table = id_table, 2029 .probe = virtnet_probe, 2030 .remove = virtnet_remove, 2031 .config_changed = virtnet_config_changed, 2032 #ifdef CONFIG_PM_SLEEP 2033 .freeze = virtnet_freeze, 2034 .restore = virtnet_restore, 2035 #endif 2036 }; 2037 2038 module_virtio_driver(virtio_net_driver); 2039 2040 MODULE_DEVICE_TABLE(virtio, id_table); 2041 MODULE_DESCRIPTION("Virtio network driver"); 2042 MODULE_LICENSE("GPL"); 2043