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 /* Active statistics */ 127 struct virtnet_stats __percpu *stats; 128 129 /* Work struct for refilling if we run low on memory. */ 130 struct delayed_work refill; 131 132 /* Work struct for config space updates */ 133 struct work_struct config_work; 134 135 /* Does the affinity hint is set for virtqueues? */ 136 bool affinity_hint_set; 137 138 /* CPU hot plug notifier */ 139 struct notifier_block nb; 140 }; 141 142 struct skb_vnet_hdr { 143 union { 144 struct virtio_net_hdr hdr; 145 struct virtio_net_hdr_mrg_rxbuf mhdr; 146 }; 147 }; 148 149 struct padded_vnet_hdr { 150 struct virtio_net_hdr hdr; 151 /* 152 * virtio_net_hdr should be in a separated sg buffer because of a 153 * QEMU bug, and data sg buffer shares same page with this header sg. 154 * This padding makes next sg 16 byte aligned after virtio_net_hdr. 155 */ 156 char padding[6]; 157 }; 158 159 /* Converting between virtqueue no. and kernel tx/rx queue no. 160 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 161 */ 162 static int vq2txq(struct virtqueue *vq) 163 { 164 return (vq->index - 1) / 2; 165 } 166 167 static int txq2vq(int txq) 168 { 169 return txq * 2 + 1; 170 } 171 172 static int vq2rxq(struct virtqueue *vq) 173 { 174 return vq->index / 2; 175 } 176 177 static int rxq2vq(int rxq) 178 { 179 return rxq * 2; 180 } 181 182 static inline struct skb_vnet_hdr *skb_vnet_hdr(struct sk_buff *skb) 183 { 184 return (struct skb_vnet_hdr *)skb->cb; 185 } 186 187 /* 188 * private is used to chain pages for big packets, put the whole 189 * most recent used list in the beginning for reuse 190 */ 191 static void give_pages(struct receive_queue *rq, struct page *page) 192 { 193 struct page *end; 194 195 /* Find end of list, sew whole thing into vi->rq.pages. */ 196 for (end = page; end->private; end = (struct page *)end->private); 197 end->private = (unsigned long)rq->pages; 198 rq->pages = page; 199 } 200 201 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 202 { 203 struct page *p = rq->pages; 204 205 if (p) { 206 rq->pages = (struct page *)p->private; 207 /* clear private here, it is used to chain pages */ 208 p->private = 0; 209 } else 210 p = alloc_page(gfp_mask); 211 return p; 212 } 213 214 static void skb_xmit_done(struct virtqueue *vq) 215 { 216 struct virtnet_info *vi = vq->vdev->priv; 217 218 /* Suppress further interrupts. */ 219 virtqueue_disable_cb(vq); 220 221 /* We were probably waiting for more output buffers. */ 222 netif_wake_subqueue(vi->dev, vq2txq(vq)); 223 } 224 225 static unsigned int mergeable_ctx_to_buf_truesize(unsigned long mrg_ctx) 226 { 227 unsigned int truesize = mrg_ctx & (MERGEABLE_BUFFER_ALIGN - 1); 228 return (truesize + 1) * MERGEABLE_BUFFER_ALIGN; 229 } 230 231 static void *mergeable_ctx_to_buf_address(unsigned long mrg_ctx) 232 { 233 return (void *)(mrg_ctx & -MERGEABLE_BUFFER_ALIGN); 234 235 } 236 237 static unsigned long mergeable_buf_to_ctx(void *buf, unsigned int truesize) 238 { 239 unsigned int size = truesize / MERGEABLE_BUFFER_ALIGN; 240 return (unsigned long)buf | (size - 1); 241 } 242 243 /* Called from bottom half context */ 244 static struct sk_buff *page_to_skb(struct receive_queue *rq, 245 struct page *page, unsigned int offset, 246 unsigned int len, unsigned int truesize) 247 { 248 struct virtnet_info *vi = rq->vq->vdev->priv; 249 struct sk_buff *skb; 250 struct skb_vnet_hdr *hdr; 251 unsigned int copy, hdr_len, hdr_padded_len; 252 char *p; 253 254 p = page_address(page) + offset; 255 256 /* copy small packet so we can reuse these pages for small data */ 257 skb = netdev_alloc_skb_ip_align(vi->dev, GOOD_COPY_LEN); 258 if (unlikely(!skb)) 259 return NULL; 260 261 hdr = skb_vnet_hdr(skb); 262 263 if (vi->mergeable_rx_bufs) { 264 hdr_len = sizeof hdr->mhdr; 265 hdr_padded_len = sizeof hdr->mhdr; 266 } else { 267 hdr_len = sizeof hdr->hdr; 268 hdr_padded_len = sizeof(struct padded_vnet_hdr); 269 } 270 271 memcpy(hdr, p, hdr_len); 272 273 len -= hdr_len; 274 offset += hdr_padded_len; 275 p += hdr_padded_len; 276 277 copy = len; 278 if (copy > skb_tailroom(skb)) 279 copy = skb_tailroom(skb); 280 memcpy(skb_put(skb, copy), p, copy); 281 282 len -= copy; 283 offset += copy; 284 285 if (vi->mergeable_rx_bufs) { 286 if (len) 287 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 288 else 289 put_page(page); 290 return skb; 291 } 292 293 /* 294 * Verify that we can indeed put this data into a skb. 295 * This is here to handle cases when the device erroneously 296 * tries to receive more than is possible. This is usually 297 * the case of a broken device. 298 */ 299 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 300 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 301 dev_kfree_skb(skb); 302 return NULL; 303 } 304 BUG_ON(offset >= PAGE_SIZE); 305 while (len) { 306 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 307 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 308 frag_size, truesize); 309 len -= frag_size; 310 page = (struct page *)page->private; 311 offset = 0; 312 } 313 314 if (page) 315 give_pages(rq, page); 316 317 return skb; 318 } 319 320 static struct sk_buff *receive_small(void *buf, unsigned int len) 321 { 322 struct sk_buff * skb = buf; 323 324 len -= sizeof(struct virtio_net_hdr); 325 skb_trim(skb, len); 326 327 return skb; 328 } 329 330 static struct sk_buff *receive_big(struct net_device *dev, 331 struct receive_queue *rq, 332 void *buf, 333 unsigned int len) 334 { 335 struct page *page = buf; 336 struct sk_buff *skb = page_to_skb(rq, page, 0, len, PAGE_SIZE); 337 338 if (unlikely(!skb)) 339 goto err; 340 341 return skb; 342 343 err: 344 dev->stats.rx_dropped++; 345 give_pages(rq, page); 346 return NULL; 347 } 348 349 static struct sk_buff *receive_mergeable(struct net_device *dev, 350 struct receive_queue *rq, 351 unsigned long ctx, 352 unsigned int len) 353 { 354 void *buf = mergeable_ctx_to_buf_address(ctx); 355 struct skb_vnet_hdr *hdr = buf; 356 int num_buf = hdr->mhdr.num_buffers; 357 struct page *page = virt_to_head_page(buf); 358 int offset = buf - page_address(page); 359 unsigned int truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 360 361 struct sk_buff *head_skb = page_to_skb(rq, page, offset, len, truesize); 362 struct sk_buff *curr_skb = head_skb; 363 364 if (unlikely(!curr_skb)) 365 goto err_skb; 366 while (--num_buf) { 367 int num_skb_frags; 368 369 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 370 if (unlikely(!ctx)) { 371 pr_debug("%s: rx error: %d buffers out of %d missing\n", 372 dev->name, num_buf, hdr->mhdr.num_buffers); 373 dev->stats.rx_length_errors++; 374 goto err_buf; 375 } 376 377 buf = mergeable_ctx_to_buf_address(ctx); 378 page = virt_to_head_page(buf); 379 380 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 381 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 382 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 383 384 if (unlikely(!nskb)) 385 goto err_skb; 386 if (curr_skb == head_skb) 387 skb_shinfo(curr_skb)->frag_list = nskb; 388 else 389 curr_skb->next = nskb; 390 curr_skb = nskb; 391 head_skb->truesize += nskb->truesize; 392 num_skb_frags = 0; 393 } 394 truesize = max(len, mergeable_ctx_to_buf_truesize(ctx)); 395 if (curr_skb != head_skb) { 396 head_skb->data_len += len; 397 head_skb->len += len; 398 head_skb->truesize += truesize; 399 } 400 offset = buf - page_address(page); 401 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 402 put_page(page); 403 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 404 len, truesize); 405 } else { 406 skb_add_rx_frag(curr_skb, num_skb_frags, page, 407 offset, len, truesize); 408 } 409 } 410 411 ewma_add(&rq->mrg_avg_pkt_len, head_skb->len); 412 return head_skb; 413 414 err_skb: 415 put_page(page); 416 while (--num_buf) { 417 ctx = (unsigned long)virtqueue_get_buf(rq->vq, &len); 418 if (unlikely(!ctx)) { 419 pr_debug("%s: rx error: %d buffers missing\n", 420 dev->name, num_buf); 421 dev->stats.rx_length_errors++; 422 break; 423 } 424 page = virt_to_head_page(mergeable_ctx_to_buf_address(ctx)); 425 put_page(page); 426 } 427 err_buf: 428 dev->stats.rx_dropped++; 429 dev_kfree_skb(head_skb); 430 return NULL; 431 } 432 433 static void receive_buf(struct receive_queue *rq, void *buf, unsigned int len) 434 { 435 struct virtnet_info *vi = rq->vq->vdev->priv; 436 struct net_device *dev = vi->dev; 437 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 438 struct sk_buff *skb; 439 struct skb_vnet_hdr *hdr; 440 441 if (unlikely(len < sizeof(struct virtio_net_hdr) + ETH_HLEN)) { 442 pr_debug("%s: short packet %i\n", dev->name, len); 443 dev->stats.rx_length_errors++; 444 if (vi->mergeable_rx_bufs) { 445 unsigned long ctx = (unsigned long)buf; 446 void *base = mergeable_ctx_to_buf_address(ctx); 447 put_page(virt_to_head_page(base)); 448 } else if (vi->big_packets) { 449 give_pages(rq, buf); 450 } else { 451 dev_kfree_skb(buf); 452 } 453 return; 454 } 455 456 if (vi->mergeable_rx_bufs) 457 skb = receive_mergeable(dev, rq, (unsigned long)buf, len); 458 else if (vi->big_packets) 459 skb = receive_big(dev, rq, buf, len); 460 else 461 skb = receive_small(buf, len); 462 463 if (unlikely(!skb)) 464 return; 465 466 hdr = skb_vnet_hdr(skb); 467 468 u64_stats_update_begin(&stats->rx_syncp); 469 stats->rx_bytes += skb->len; 470 stats->rx_packets++; 471 u64_stats_update_end(&stats->rx_syncp); 472 473 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { 474 pr_debug("Needs csum!\n"); 475 if (!skb_partial_csum_set(skb, 476 hdr->hdr.csum_start, 477 hdr->hdr.csum_offset)) 478 goto frame_err; 479 } else if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) { 480 skb->ip_summed = CHECKSUM_UNNECESSARY; 481 } 482 483 skb->protocol = eth_type_trans(skb, dev); 484 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 485 ntohs(skb->protocol), skb->len, skb->pkt_type); 486 487 if (hdr->hdr.gso_type != VIRTIO_NET_HDR_GSO_NONE) { 488 pr_debug("GSO!\n"); 489 switch (hdr->hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { 490 case VIRTIO_NET_HDR_GSO_TCPV4: 491 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; 492 break; 493 case VIRTIO_NET_HDR_GSO_UDP: 494 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 495 break; 496 case VIRTIO_NET_HDR_GSO_TCPV6: 497 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; 498 break; 499 default: 500 net_warn_ratelimited("%s: bad gso type %u.\n", 501 dev->name, hdr->hdr.gso_type); 502 goto frame_err; 503 } 504 505 if (hdr->hdr.gso_type & VIRTIO_NET_HDR_GSO_ECN) 506 skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; 507 508 skb_shinfo(skb)->gso_size = 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 receive_queue *rq, gfp_t gfp) 530 { 531 struct virtnet_info *vi = rq->vq->vdev->priv; 532 struct sk_buff *skb; 533 struct skb_vnet_hdr *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->hdr, sizeof hdr->hdr); 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 receive_queue *rq, gfp_t gfp) 555 { 556 struct page *first, *list = NULL; 557 char *p; 558 int i, err, offset; 559 560 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 561 562 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 563 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 564 first = get_a_page(rq, gfp); 565 if (!first) { 566 if (list) 567 give_pages(rq, list); 568 return -ENOMEM; 569 } 570 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 571 572 /* chain new page in list head to match sg */ 573 first->private = (unsigned long)list; 574 list = first; 575 } 576 577 first = get_a_page(rq, gfp); 578 if (!first) { 579 give_pages(rq, list); 580 return -ENOMEM; 581 } 582 p = page_address(first); 583 584 /* rq->sg[0], rq->sg[1] share the same page */ 585 /* a separated rq->sg[0] for virtio_net_hdr only due to QEMU bug */ 586 sg_set_buf(&rq->sg[0], p, sizeof(struct virtio_net_hdr)); 587 588 /* rq->sg[1] for data packet, from offset */ 589 offset = sizeof(struct padded_vnet_hdr); 590 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 591 592 /* chain first in list head */ 593 first->private = (unsigned long)list; 594 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 595 first, gfp); 596 if (err < 0) 597 give_pages(rq, first); 598 599 return err; 600 } 601 602 static unsigned int get_mergeable_buf_len(struct ewma *avg_pkt_len) 603 { 604 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 605 unsigned int len; 606 607 len = hdr_len + clamp_t(unsigned int, ewma_read(avg_pkt_len), 608 GOOD_PACKET_LEN, PAGE_SIZE - hdr_len); 609 return ALIGN(len, MERGEABLE_BUFFER_ALIGN); 610 } 611 612 static int add_recvbuf_mergeable(struct receive_queue *rq, gfp_t gfp) 613 { 614 struct page_frag *alloc_frag = &rq->alloc_frag; 615 char *buf; 616 unsigned long ctx; 617 int err; 618 unsigned int len, hole; 619 620 len = get_mergeable_buf_len(&rq->mrg_avg_pkt_len); 621 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 622 return -ENOMEM; 623 624 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 625 ctx = mergeable_buf_to_ctx(buf, len); 626 get_page(alloc_frag->page); 627 alloc_frag->offset += len; 628 hole = alloc_frag->size - alloc_frag->offset; 629 if (hole < len) { 630 /* To avoid internal fragmentation, if there is very likely not 631 * enough space for another buffer, add the remaining space to 632 * the current buffer. This extra space is not included in 633 * the truesize stored in ctx. 634 */ 635 len += hole; 636 alloc_frag->offset += hole; 637 } 638 639 sg_init_one(rq->sg, buf, len); 640 err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, (void *)ctx, gfp); 641 if (err < 0) 642 put_page(virt_to_head_page(buf)); 643 644 return err; 645 } 646 647 /* 648 * Returns false if we couldn't fill entirely (OOM). 649 * 650 * Normally run in the receive path, but can also be run from ndo_open 651 * before we're receiving packets, or from refill_work which is 652 * careful to disable receiving (using napi_disable). 653 */ 654 static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp) 655 { 656 struct virtnet_info *vi = rq->vq->vdev->priv; 657 int err; 658 bool oom; 659 660 gfp |= __GFP_COLD; 661 do { 662 if (vi->mergeable_rx_bufs) 663 err = add_recvbuf_mergeable(rq, gfp); 664 else if (vi->big_packets) 665 err = add_recvbuf_big(rq, gfp); 666 else 667 err = add_recvbuf_small(rq, gfp); 668 669 oom = err == -ENOMEM; 670 if (err) 671 break; 672 } while (rq->vq->num_free); 673 virtqueue_kick(rq->vq); 674 return !oom; 675 } 676 677 static void skb_recv_done(struct virtqueue *rvq) 678 { 679 struct virtnet_info *vi = rvq->vdev->priv; 680 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 681 682 /* Schedule NAPI, Suppress further interrupts if successful. */ 683 if (napi_schedule_prep(&rq->napi)) { 684 virtqueue_disable_cb(rvq); 685 __napi_schedule(&rq->napi); 686 } 687 } 688 689 static void virtnet_napi_enable(struct receive_queue *rq) 690 { 691 napi_enable(&rq->napi); 692 693 /* If all buffers were filled by other side before we napi_enabled, we 694 * won't get another interrupt, so process any outstanding packets 695 * now. virtnet_poll wants re-enable the queue, so we disable here. 696 * We synchronize against interrupts via NAPI_STATE_SCHED */ 697 if (napi_schedule_prep(&rq->napi)) { 698 virtqueue_disable_cb(rq->vq); 699 local_bh_disable(); 700 __napi_schedule(&rq->napi); 701 local_bh_enable(); 702 } 703 } 704 705 static void refill_work(struct work_struct *work) 706 { 707 struct virtnet_info *vi = 708 container_of(work, struct virtnet_info, refill.work); 709 bool still_empty; 710 int i; 711 712 for (i = 0; i < vi->curr_queue_pairs; i++) { 713 struct receive_queue *rq = &vi->rq[i]; 714 715 napi_disable(&rq->napi); 716 still_empty = !try_fill_recv(rq, GFP_KERNEL); 717 virtnet_napi_enable(rq); 718 719 /* In theory, this can happen: if we don't get any buffers in 720 * we will *never* try to fill again. 721 */ 722 if (still_empty) 723 schedule_delayed_work(&vi->refill, HZ/2); 724 } 725 } 726 727 static int virtnet_receive(struct receive_queue *rq, int budget) 728 { 729 struct virtnet_info *vi = rq->vq->vdev->priv; 730 unsigned int len, received = 0; 731 void *buf; 732 733 while (received < budget && 734 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 735 receive_buf(rq, buf, len); 736 received++; 737 } 738 739 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 740 if (!try_fill_recv(rq, GFP_ATOMIC)) 741 schedule_delayed_work(&vi->refill, 0); 742 } 743 744 return received; 745 } 746 747 static int virtnet_poll(struct napi_struct *napi, int budget) 748 { 749 struct receive_queue *rq = 750 container_of(napi, struct receive_queue, napi); 751 unsigned int r, received = 0; 752 753 again: 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 goto again; 765 } 766 } 767 768 return received; 769 } 770 771 #ifdef CONFIG_NET_RX_BUSY_POLL 772 /* must be called with local_bh_disable()d */ 773 static int virtnet_busy_poll(struct napi_struct *napi) 774 { 775 struct receive_queue *rq = 776 container_of(napi, struct receive_queue, napi); 777 struct virtnet_info *vi = rq->vq->vdev->priv; 778 int r, received = 0, budget = 4; 779 780 if (!(vi->status & VIRTIO_NET_S_LINK_UP)) 781 return LL_FLUSH_FAILED; 782 783 if (!napi_schedule_prep(napi)) 784 return LL_FLUSH_BUSY; 785 786 virtqueue_disable_cb(rq->vq); 787 788 again: 789 received += virtnet_receive(rq, budget); 790 791 r = virtqueue_enable_cb_prepare(rq->vq); 792 clear_bit(NAPI_STATE_SCHED, &napi->state); 793 if (unlikely(virtqueue_poll(rq->vq, r)) && 794 napi_schedule_prep(napi)) { 795 virtqueue_disable_cb(rq->vq); 796 if (received < budget) { 797 budget -= received; 798 goto again; 799 } else { 800 __napi_schedule(napi); 801 } 802 } 803 804 return received; 805 } 806 #endif /* CONFIG_NET_RX_BUSY_POLL */ 807 808 static int virtnet_open(struct net_device *dev) 809 { 810 struct virtnet_info *vi = netdev_priv(dev); 811 int i; 812 813 for (i = 0; i < vi->max_queue_pairs; i++) { 814 if (i < vi->curr_queue_pairs) 815 /* Make sure we have some buffers: if oom use wq. */ 816 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) 817 schedule_delayed_work(&vi->refill, 0); 818 virtnet_napi_enable(&vi->rq[i]); 819 } 820 821 return 0; 822 } 823 824 static void free_old_xmit_skbs(struct send_queue *sq) 825 { 826 struct sk_buff *skb; 827 unsigned int len; 828 struct virtnet_info *vi = sq->vq->vdev->priv; 829 struct virtnet_stats *stats = this_cpu_ptr(vi->stats); 830 831 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 832 pr_debug("Sent skb %p\n", skb); 833 834 u64_stats_update_begin(&stats->tx_syncp); 835 stats->tx_bytes += skb->len; 836 stats->tx_packets++; 837 u64_stats_update_end(&stats->tx_syncp); 838 839 dev_kfree_skb_any(skb); 840 } 841 } 842 843 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 844 { 845 struct skb_vnet_hdr *hdr; 846 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 847 struct virtnet_info *vi = sq->vq->vdev->priv; 848 unsigned num_sg; 849 unsigned hdr_len; 850 bool can_push; 851 852 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 853 if (vi->mergeable_rx_bufs) 854 hdr_len = sizeof hdr->mhdr; 855 else 856 hdr_len = sizeof hdr->hdr; 857 858 can_push = vi->any_header_sg && 859 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 860 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 861 /* Even if we can, don't push here yet as this would skew 862 * csum_start offset below. */ 863 if (can_push) 864 hdr = (struct skb_vnet_hdr *)(skb->data - hdr_len); 865 else 866 hdr = skb_vnet_hdr(skb); 867 868 if (skb->ip_summed == CHECKSUM_PARTIAL) { 869 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; 870 hdr->hdr.csum_start = skb_checksum_start_offset(skb); 871 hdr->hdr.csum_offset = skb->csum_offset; 872 } else { 873 hdr->hdr.flags = 0; 874 hdr->hdr.csum_offset = hdr->hdr.csum_start = 0; 875 } 876 877 if (skb_is_gso(skb)) { 878 hdr->hdr.hdr_len = skb_headlen(skb); 879 hdr->hdr.gso_size = skb_shinfo(skb)->gso_size; 880 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) 881 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; 882 else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) 883 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; 884 else if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP) 885 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_UDP; 886 else 887 BUG(); 888 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCP_ECN) 889 hdr->hdr.gso_type |= VIRTIO_NET_HDR_GSO_ECN; 890 } else { 891 hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE; 892 hdr->hdr.gso_size = hdr->hdr.hdr_len = 0; 893 } 894 895 if (vi->mergeable_rx_bufs) 896 hdr->mhdr.num_buffers = 0; 897 898 sg_init_table(sq->sg, MAX_SKB_FRAGS + 2); 899 if (can_push) { 900 __skb_push(skb, hdr_len); 901 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 902 /* Pull header back to avoid skew in tx bytes calculations. */ 903 __skb_pull(skb, hdr_len); 904 } else { 905 sg_set_buf(sq->sg, hdr, hdr_len); 906 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1; 907 } 908 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 909 } 910 911 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 912 { 913 struct virtnet_info *vi = netdev_priv(dev); 914 int qnum = skb_get_queue_mapping(skb); 915 struct send_queue *sq = &vi->sq[qnum]; 916 int err; 917 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 918 bool kick = !skb->xmit_more; 919 920 /* Free up any pending old buffers before queueing new ones. */ 921 free_old_xmit_skbs(sq); 922 923 /* Try to transmit */ 924 err = xmit_skb(sq, skb); 925 926 /* This should not happen! */ 927 if (unlikely(err)) { 928 dev->stats.tx_fifo_errors++; 929 if (net_ratelimit()) 930 dev_warn(&dev->dev, 931 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 932 dev->stats.tx_dropped++; 933 dev_kfree_skb_any(skb); 934 return NETDEV_TX_OK; 935 } 936 937 /* Don't wait up for transmitted skbs to be freed. */ 938 skb_orphan(skb); 939 nf_reset(skb); 940 941 /* Apparently nice girls don't return TX_BUSY; stop the queue 942 * before it gets out of hand. Naturally, this wastes entries. */ 943 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 944 netif_stop_subqueue(dev, qnum); 945 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 946 /* More just got used, free them then recheck. */ 947 free_old_xmit_skbs(sq); 948 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 949 netif_start_subqueue(dev, qnum); 950 virtqueue_disable_cb(sq->vq); 951 } 952 } 953 } 954 955 if (kick || netif_xmit_stopped(txq)) 956 virtqueue_kick(sq->vq); 957 958 return NETDEV_TX_OK; 959 } 960 961 /* 962 * Send command via the control virtqueue and check status. Commands 963 * supported by the hypervisor, as indicated by feature bits, should 964 * never fail unless improperly formatted. 965 */ 966 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 967 struct scatterlist *out) 968 { 969 struct scatterlist *sgs[4], hdr, stat; 970 struct virtio_net_ctrl_hdr ctrl; 971 virtio_net_ctrl_ack status = ~0; 972 unsigned out_num = 0, tmp; 973 974 /* Caller should know better */ 975 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 976 977 ctrl.class = class; 978 ctrl.cmd = cmd; 979 /* Add header */ 980 sg_init_one(&hdr, &ctrl, sizeof(ctrl)); 981 sgs[out_num++] = &hdr; 982 983 if (out) 984 sgs[out_num++] = out; 985 986 /* Add return status. */ 987 sg_init_one(&stat, &status, sizeof(status)); 988 sgs[out_num] = &stat; 989 990 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 991 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 992 993 if (unlikely(!virtqueue_kick(vi->cvq))) 994 return status == VIRTIO_NET_OK; 995 996 /* Spin for a response, the kick causes an ioport write, trapping 997 * into the hypervisor, so the request should be handled immediately. 998 */ 999 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1000 !virtqueue_is_broken(vi->cvq)) 1001 cpu_relax(); 1002 1003 return status == VIRTIO_NET_OK; 1004 } 1005 1006 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1007 { 1008 struct virtnet_info *vi = netdev_priv(dev); 1009 struct virtio_device *vdev = vi->vdev; 1010 int ret; 1011 struct sockaddr *addr = p; 1012 struct scatterlist sg; 1013 1014 ret = eth_prepare_mac_addr_change(dev, p); 1015 if (ret) 1016 return ret; 1017 1018 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1019 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1020 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1021 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1022 dev_warn(&vdev->dev, 1023 "Failed to set mac address by vq command.\n"); 1024 return -EINVAL; 1025 } 1026 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 1027 unsigned int i; 1028 1029 /* Naturally, this has an atomicity problem. */ 1030 for (i = 0; i < dev->addr_len; i++) 1031 virtio_cwrite8(vdev, 1032 offsetof(struct virtio_net_config, mac) + 1033 i, addr->sa_data[i]); 1034 } 1035 1036 eth_commit_mac_addr_change(dev, p); 1037 1038 return 0; 1039 } 1040 1041 static struct rtnl_link_stats64 *virtnet_stats(struct net_device *dev, 1042 struct rtnl_link_stats64 *tot) 1043 { 1044 struct virtnet_info *vi = netdev_priv(dev); 1045 int cpu; 1046 unsigned int start; 1047 1048 for_each_possible_cpu(cpu) { 1049 struct virtnet_stats *stats = per_cpu_ptr(vi->stats, cpu); 1050 u64 tpackets, tbytes, rpackets, rbytes; 1051 1052 do { 1053 start = u64_stats_fetch_begin_irq(&stats->tx_syncp); 1054 tpackets = stats->tx_packets; 1055 tbytes = stats->tx_bytes; 1056 } while (u64_stats_fetch_retry_irq(&stats->tx_syncp, start)); 1057 1058 do { 1059 start = u64_stats_fetch_begin_irq(&stats->rx_syncp); 1060 rpackets = stats->rx_packets; 1061 rbytes = stats->rx_bytes; 1062 } while (u64_stats_fetch_retry_irq(&stats->rx_syncp, start)); 1063 1064 tot->rx_packets += rpackets; 1065 tot->tx_packets += tpackets; 1066 tot->rx_bytes += rbytes; 1067 tot->tx_bytes += tbytes; 1068 } 1069 1070 tot->tx_dropped = dev->stats.tx_dropped; 1071 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1072 tot->rx_dropped = dev->stats.rx_dropped; 1073 tot->rx_length_errors = dev->stats.rx_length_errors; 1074 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1075 1076 return tot; 1077 } 1078 1079 #ifdef CONFIG_NET_POLL_CONTROLLER 1080 static void virtnet_netpoll(struct net_device *dev) 1081 { 1082 struct virtnet_info *vi = netdev_priv(dev); 1083 int i; 1084 1085 for (i = 0; i < vi->curr_queue_pairs; i++) 1086 napi_schedule(&vi->rq[i].napi); 1087 } 1088 #endif 1089 1090 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1091 { 1092 rtnl_lock(); 1093 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1094 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1095 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1096 rtnl_unlock(); 1097 } 1098 1099 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1100 { 1101 struct scatterlist sg; 1102 struct virtio_net_ctrl_mq s; 1103 struct net_device *dev = vi->dev; 1104 1105 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1106 return 0; 1107 1108 s.virtqueue_pairs = queue_pairs; 1109 sg_init_one(&sg, &s, sizeof(s)); 1110 1111 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1112 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1113 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1114 queue_pairs); 1115 return -EINVAL; 1116 } else { 1117 vi->curr_queue_pairs = queue_pairs; 1118 /* virtnet_open() will refill when device is going to up. */ 1119 if (dev->flags & IFF_UP) 1120 schedule_delayed_work(&vi->refill, 0); 1121 } 1122 1123 return 0; 1124 } 1125 1126 static int virtnet_close(struct net_device *dev) 1127 { 1128 struct virtnet_info *vi = netdev_priv(dev); 1129 int i; 1130 1131 /* Make sure refill_work doesn't re-enable napi! */ 1132 cancel_delayed_work_sync(&vi->refill); 1133 1134 for (i = 0; i < vi->max_queue_pairs; i++) 1135 napi_disable(&vi->rq[i].napi); 1136 1137 return 0; 1138 } 1139 1140 static void virtnet_set_rx_mode(struct net_device *dev) 1141 { 1142 struct virtnet_info *vi = netdev_priv(dev); 1143 struct scatterlist sg[2]; 1144 u8 promisc, allmulti; 1145 struct virtio_net_ctrl_mac *mac_data; 1146 struct netdev_hw_addr *ha; 1147 int uc_count; 1148 int mc_count; 1149 void *buf; 1150 int i; 1151 1152 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1153 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1154 return; 1155 1156 promisc = ((dev->flags & IFF_PROMISC) != 0); 1157 allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1158 1159 sg_init_one(sg, &promisc, sizeof(promisc)); 1160 1161 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1162 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1163 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1164 promisc ? "en" : "dis"); 1165 1166 sg_init_one(sg, &allmulti, sizeof(allmulti)); 1167 1168 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1169 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1170 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1171 allmulti ? "en" : "dis"); 1172 1173 uc_count = netdev_uc_count(dev); 1174 mc_count = netdev_mc_count(dev); 1175 /* MAC filter - use one buffer for both lists */ 1176 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1177 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1178 mac_data = buf; 1179 if (!buf) 1180 return; 1181 1182 sg_init_table(sg, 2); 1183 1184 /* Store the unicast list and count in the front of the buffer */ 1185 mac_data->entries = uc_count; 1186 i = 0; 1187 netdev_for_each_uc_addr(ha, dev) 1188 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1189 1190 sg_set_buf(&sg[0], mac_data, 1191 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1192 1193 /* multicast list and count fill the end */ 1194 mac_data = (void *)&mac_data->macs[uc_count][0]; 1195 1196 mac_data->entries = mc_count; 1197 i = 0; 1198 netdev_for_each_mc_addr(ha, dev) 1199 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1200 1201 sg_set_buf(&sg[1], mac_data, 1202 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1203 1204 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1205 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1206 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1207 1208 kfree(buf); 1209 } 1210 1211 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1212 __be16 proto, u16 vid) 1213 { 1214 struct virtnet_info *vi = netdev_priv(dev); 1215 struct scatterlist sg; 1216 1217 sg_init_one(&sg, &vid, sizeof(vid)); 1218 1219 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1220 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1221 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1222 return 0; 1223 } 1224 1225 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1226 __be16 proto, u16 vid) 1227 { 1228 struct virtnet_info *vi = netdev_priv(dev); 1229 struct scatterlist sg; 1230 1231 sg_init_one(&sg, &vid, sizeof(vid)); 1232 1233 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1234 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1235 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1236 return 0; 1237 } 1238 1239 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1240 { 1241 int i; 1242 1243 if (vi->affinity_hint_set) { 1244 for (i = 0; i < vi->max_queue_pairs; i++) { 1245 virtqueue_set_affinity(vi->rq[i].vq, -1); 1246 virtqueue_set_affinity(vi->sq[i].vq, -1); 1247 } 1248 1249 vi->affinity_hint_set = false; 1250 } 1251 } 1252 1253 static void virtnet_set_affinity(struct virtnet_info *vi) 1254 { 1255 int i; 1256 int cpu; 1257 1258 /* In multiqueue mode, when the number of cpu is equal to the number of 1259 * queue pairs, we let the queue pairs to be private to one cpu by 1260 * setting the affinity hint to eliminate the contention. 1261 */ 1262 if (vi->curr_queue_pairs == 1 || 1263 vi->max_queue_pairs != num_online_cpus()) { 1264 virtnet_clean_affinity(vi, -1); 1265 return; 1266 } 1267 1268 i = 0; 1269 for_each_online_cpu(cpu) { 1270 virtqueue_set_affinity(vi->rq[i].vq, cpu); 1271 virtqueue_set_affinity(vi->sq[i].vq, cpu); 1272 netif_set_xps_queue(vi->dev, cpumask_of(cpu), i); 1273 i++; 1274 } 1275 1276 vi->affinity_hint_set = true; 1277 } 1278 1279 static int virtnet_cpu_callback(struct notifier_block *nfb, 1280 unsigned long action, void *hcpu) 1281 { 1282 struct virtnet_info *vi = container_of(nfb, struct virtnet_info, nb); 1283 1284 switch(action & ~CPU_TASKS_FROZEN) { 1285 case CPU_ONLINE: 1286 case CPU_DOWN_FAILED: 1287 case CPU_DEAD: 1288 virtnet_set_affinity(vi); 1289 break; 1290 case CPU_DOWN_PREPARE: 1291 virtnet_clean_affinity(vi, (long)hcpu); 1292 break; 1293 default: 1294 break; 1295 } 1296 1297 return NOTIFY_OK; 1298 } 1299 1300 static void virtnet_get_ringparam(struct net_device *dev, 1301 struct ethtool_ringparam *ring) 1302 { 1303 struct virtnet_info *vi = netdev_priv(dev); 1304 1305 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1306 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1307 ring->rx_pending = ring->rx_max_pending; 1308 ring->tx_pending = ring->tx_max_pending; 1309 } 1310 1311 1312 static void virtnet_get_drvinfo(struct net_device *dev, 1313 struct ethtool_drvinfo *info) 1314 { 1315 struct virtnet_info *vi = netdev_priv(dev); 1316 struct virtio_device *vdev = vi->vdev; 1317 1318 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1319 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1320 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1321 1322 } 1323 1324 /* TODO: Eliminate OOO packets during switching */ 1325 static int virtnet_set_channels(struct net_device *dev, 1326 struct ethtool_channels *channels) 1327 { 1328 struct virtnet_info *vi = netdev_priv(dev); 1329 u16 queue_pairs = channels->combined_count; 1330 int err; 1331 1332 /* We don't support separate rx/tx channels. 1333 * We don't allow setting 'other' channels. 1334 */ 1335 if (channels->rx_count || channels->tx_count || channels->other_count) 1336 return -EINVAL; 1337 1338 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 1339 return -EINVAL; 1340 1341 get_online_cpus(); 1342 err = virtnet_set_queues(vi, queue_pairs); 1343 if (!err) { 1344 netif_set_real_num_tx_queues(dev, queue_pairs); 1345 netif_set_real_num_rx_queues(dev, queue_pairs); 1346 1347 virtnet_set_affinity(vi); 1348 } 1349 put_online_cpus(); 1350 1351 return err; 1352 } 1353 1354 static void virtnet_get_channels(struct net_device *dev, 1355 struct ethtool_channels *channels) 1356 { 1357 struct virtnet_info *vi = netdev_priv(dev); 1358 1359 channels->combined_count = vi->curr_queue_pairs; 1360 channels->max_combined = vi->max_queue_pairs; 1361 channels->max_other = 0; 1362 channels->rx_count = 0; 1363 channels->tx_count = 0; 1364 channels->other_count = 0; 1365 } 1366 1367 static const struct ethtool_ops virtnet_ethtool_ops = { 1368 .get_drvinfo = virtnet_get_drvinfo, 1369 .get_link = ethtool_op_get_link, 1370 .get_ringparam = virtnet_get_ringparam, 1371 .set_channels = virtnet_set_channels, 1372 .get_channels = virtnet_get_channels, 1373 }; 1374 1375 #define MIN_MTU 68 1376 #define MAX_MTU 65535 1377 1378 static int virtnet_change_mtu(struct net_device *dev, int new_mtu) 1379 { 1380 if (new_mtu < MIN_MTU || new_mtu > MAX_MTU) 1381 return -EINVAL; 1382 dev->mtu = new_mtu; 1383 return 0; 1384 } 1385 1386 static const struct net_device_ops virtnet_netdev = { 1387 .ndo_open = virtnet_open, 1388 .ndo_stop = virtnet_close, 1389 .ndo_start_xmit = start_xmit, 1390 .ndo_validate_addr = eth_validate_addr, 1391 .ndo_set_mac_address = virtnet_set_mac_address, 1392 .ndo_set_rx_mode = virtnet_set_rx_mode, 1393 .ndo_change_mtu = virtnet_change_mtu, 1394 .ndo_get_stats64 = virtnet_stats, 1395 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 1396 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 1397 #ifdef CONFIG_NET_POLL_CONTROLLER 1398 .ndo_poll_controller = virtnet_netpoll, 1399 #endif 1400 #ifdef CONFIG_NET_RX_BUSY_POLL 1401 .ndo_busy_poll = virtnet_busy_poll, 1402 #endif 1403 }; 1404 1405 static void virtnet_config_changed_work(struct work_struct *work) 1406 { 1407 struct virtnet_info *vi = 1408 container_of(work, struct virtnet_info, config_work); 1409 u16 v; 1410 1411 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 1412 struct virtio_net_config, status, &v) < 0) 1413 return; 1414 1415 if (v & VIRTIO_NET_S_ANNOUNCE) { 1416 netdev_notify_peers(vi->dev); 1417 virtnet_ack_link_announce(vi); 1418 } 1419 1420 /* Ignore unknown (future) status bits */ 1421 v &= VIRTIO_NET_S_LINK_UP; 1422 1423 if (vi->status == v) 1424 return; 1425 1426 vi->status = v; 1427 1428 if (vi->status & VIRTIO_NET_S_LINK_UP) { 1429 netif_carrier_on(vi->dev); 1430 netif_tx_wake_all_queues(vi->dev); 1431 } else { 1432 netif_carrier_off(vi->dev); 1433 netif_tx_stop_all_queues(vi->dev); 1434 } 1435 } 1436 1437 static void virtnet_config_changed(struct virtio_device *vdev) 1438 { 1439 struct virtnet_info *vi = vdev->priv; 1440 1441 schedule_work(&vi->config_work); 1442 } 1443 1444 static void virtnet_free_queues(struct virtnet_info *vi) 1445 { 1446 int i; 1447 1448 for (i = 0; i < vi->max_queue_pairs; i++) 1449 netif_napi_del(&vi->rq[i].napi); 1450 1451 kfree(vi->rq); 1452 kfree(vi->sq); 1453 } 1454 1455 static void free_receive_bufs(struct virtnet_info *vi) 1456 { 1457 int i; 1458 1459 for (i = 0; i < vi->max_queue_pairs; i++) { 1460 while (vi->rq[i].pages) 1461 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 1462 } 1463 } 1464 1465 static void free_receive_page_frags(struct virtnet_info *vi) 1466 { 1467 int i; 1468 for (i = 0; i < vi->max_queue_pairs; i++) 1469 if (vi->rq[i].alloc_frag.page) 1470 put_page(vi->rq[i].alloc_frag.page); 1471 } 1472 1473 static void free_unused_bufs(struct virtnet_info *vi) 1474 { 1475 void *buf; 1476 int i; 1477 1478 for (i = 0; i < vi->max_queue_pairs; i++) { 1479 struct virtqueue *vq = vi->sq[i].vq; 1480 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 1481 dev_kfree_skb(buf); 1482 } 1483 1484 for (i = 0; i < vi->max_queue_pairs; i++) { 1485 struct virtqueue *vq = vi->rq[i].vq; 1486 1487 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 1488 if (vi->mergeable_rx_bufs) { 1489 unsigned long ctx = (unsigned long)buf; 1490 void *base = mergeable_ctx_to_buf_address(ctx); 1491 put_page(virt_to_head_page(base)); 1492 } else if (vi->big_packets) { 1493 give_pages(&vi->rq[i], buf); 1494 } else { 1495 dev_kfree_skb(buf); 1496 } 1497 } 1498 } 1499 } 1500 1501 static void virtnet_del_vqs(struct virtnet_info *vi) 1502 { 1503 struct virtio_device *vdev = vi->vdev; 1504 1505 virtnet_clean_affinity(vi, -1); 1506 1507 vdev->config->del_vqs(vdev); 1508 1509 virtnet_free_queues(vi); 1510 } 1511 1512 static int virtnet_find_vqs(struct virtnet_info *vi) 1513 { 1514 vq_callback_t **callbacks; 1515 struct virtqueue **vqs; 1516 int ret = -ENOMEM; 1517 int i, total_vqs; 1518 const char **names; 1519 1520 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 1521 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 1522 * possible control vq. 1523 */ 1524 total_vqs = vi->max_queue_pairs * 2 + 1525 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 1526 1527 /* Allocate space for find_vqs parameters */ 1528 vqs = kzalloc(total_vqs * sizeof(*vqs), GFP_KERNEL); 1529 if (!vqs) 1530 goto err_vq; 1531 callbacks = kmalloc(total_vqs * sizeof(*callbacks), GFP_KERNEL); 1532 if (!callbacks) 1533 goto err_callback; 1534 names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL); 1535 if (!names) 1536 goto err_names; 1537 1538 /* Parameters for control virtqueue, if any */ 1539 if (vi->has_cvq) { 1540 callbacks[total_vqs - 1] = NULL; 1541 names[total_vqs - 1] = "control"; 1542 } 1543 1544 /* Allocate/initialize parameters for send/receive virtqueues */ 1545 for (i = 0; i < vi->max_queue_pairs; i++) { 1546 callbacks[rxq2vq(i)] = skb_recv_done; 1547 callbacks[txq2vq(i)] = skb_xmit_done; 1548 sprintf(vi->rq[i].name, "input.%d", i); 1549 sprintf(vi->sq[i].name, "output.%d", i); 1550 names[rxq2vq(i)] = vi->rq[i].name; 1551 names[txq2vq(i)] = vi->sq[i].name; 1552 } 1553 1554 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 1555 names); 1556 if (ret) 1557 goto err_find; 1558 1559 if (vi->has_cvq) { 1560 vi->cvq = vqs[total_vqs - 1]; 1561 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 1562 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 1563 } 1564 1565 for (i = 0; i < vi->max_queue_pairs; i++) { 1566 vi->rq[i].vq = vqs[rxq2vq(i)]; 1567 vi->sq[i].vq = vqs[txq2vq(i)]; 1568 } 1569 1570 kfree(names); 1571 kfree(callbacks); 1572 kfree(vqs); 1573 1574 return 0; 1575 1576 err_find: 1577 kfree(names); 1578 err_names: 1579 kfree(callbacks); 1580 err_callback: 1581 kfree(vqs); 1582 err_vq: 1583 return ret; 1584 } 1585 1586 static int virtnet_alloc_queues(struct virtnet_info *vi) 1587 { 1588 int i; 1589 1590 vi->sq = kzalloc(sizeof(*vi->sq) * vi->max_queue_pairs, GFP_KERNEL); 1591 if (!vi->sq) 1592 goto err_sq; 1593 vi->rq = kzalloc(sizeof(*vi->rq) * vi->max_queue_pairs, GFP_KERNEL); 1594 if (!vi->rq) 1595 goto err_rq; 1596 1597 INIT_DELAYED_WORK(&vi->refill, refill_work); 1598 for (i = 0; i < vi->max_queue_pairs; i++) { 1599 vi->rq[i].pages = NULL; 1600 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 1601 napi_weight); 1602 napi_hash_add(&vi->rq[i].napi); 1603 1604 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 1605 ewma_init(&vi->rq[i].mrg_avg_pkt_len, 1, RECEIVE_AVG_WEIGHT); 1606 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 1607 } 1608 1609 return 0; 1610 1611 err_rq: 1612 kfree(vi->sq); 1613 err_sq: 1614 return -ENOMEM; 1615 } 1616 1617 static int init_vqs(struct virtnet_info *vi) 1618 { 1619 int ret; 1620 1621 /* Allocate send & receive queues */ 1622 ret = virtnet_alloc_queues(vi); 1623 if (ret) 1624 goto err; 1625 1626 ret = virtnet_find_vqs(vi); 1627 if (ret) 1628 goto err_free; 1629 1630 get_online_cpus(); 1631 virtnet_set_affinity(vi); 1632 put_online_cpus(); 1633 1634 return 0; 1635 1636 err_free: 1637 virtnet_free_queues(vi); 1638 err: 1639 return ret; 1640 } 1641 1642 #ifdef CONFIG_SYSFS 1643 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 1644 struct rx_queue_attribute *attribute, char *buf) 1645 { 1646 struct virtnet_info *vi = netdev_priv(queue->dev); 1647 unsigned int queue_index = get_netdev_rx_queue_index(queue); 1648 struct ewma *avg; 1649 1650 BUG_ON(queue_index >= vi->max_queue_pairs); 1651 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 1652 return sprintf(buf, "%u\n", get_mergeable_buf_len(avg)); 1653 } 1654 1655 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 1656 __ATTR_RO(mergeable_rx_buffer_size); 1657 1658 static struct attribute *virtio_net_mrg_rx_attrs[] = { 1659 &mergeable_rx_buffer_size_attribute.attr, 1660 NULL 1661 }; 1662 1663 static const struct attribute_group virtio_net_mrg_rx_group = { 1664 .name = "virtio_net", 1665 .attrs = virtio_net_mrg_rx_attrs 1666 }; 1667 #endif 1668 1669 static int virtnet_probe(struct virtio_device *vdev) 1670 { 1671 int i, err; 1672 struct net_device *dev; 1673 struct virtnet_info *vi; 1674 u16 max_queue_pairs; 1675 1676 /* Find if host supports multiqueue virtio_net device */ 1677 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 1678 struct virtio_net_config, 1679 max_virtqueue_pairs, &max_queue_pairs); 1680 1681 /* We need at least 2 queue's */ 1682 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 1683 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 1684 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1685 max_queue_pairs = 1; 1686 1687 /* Allocate ourselves a network device with room for our info */ 1688 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 1689 if (!dev) 1690 return -ENOMEM; 1691 1692 /* Set up network device as normal. */ 1693 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 1694 dev->netdev_ops = &virtnet_netdev; 1695 dev->features = NETIF_F_HIGHDMA; 1696 1697 dev->ethtool_ops = &virtnet_ethtool_ops; 1698 SET_NETDEV_DEV(dev, &vdev->dev); 1699 1700 /* Do we support "hardware" checksums? */ 1701 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 1702 /* This opens up the world of extra features. */ 1703 dev->hw_features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1704 if (csum) 1705 dev->features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; 1706 1707 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 1708 dev->hw_features |= NETIF_F_TSO | NETIF_F_UFO 1709 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 1710 } 1711 /* Individual feature bits: what can host handle? */ 1712 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 1713 dev->hw_features |= NETIF_F_TSO; 1714 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 1715 dev->hw_features |= NETIF_F_TSO6; 1716 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 1717 dev->hw_features |= NETIF_F_TSO_ECN; 1718 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_UFO)) 1719 dev->hw_features |= NETIF_F_UFO; 1720 1721 if (gso) 1722 dev->features |= dev->hw_features & (NETIF_F_ALL_TSO|NETIF_F_UFO); 1723 /* (!csum && gso) case will be fixed by register_netdev() */ 1724 } 1725 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 1726 dev->features |= NETIF_F_RXCSUM; 1727 1728 dev->vlan_features = dev->features; 1729 1730 /* Configuration may specify what MAC to use. Otherwise random. */ 1731 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 1732 virtio_cread_bytes(vdev, 1733 offsetof(struct virtio_net_config, mac), 1734 dev->dev_addr, dev->addr_len); 1735 else 1736 eth_hw_addr_random(dev); 1737 1738 /* Set up our device-specific information */ 1739 vi = netdev_priv(dev); 1740 vi->dev = dev; 1741 vi->vdev = vdev; 1742 vdev->priv = vi; 1743 vi->stats = alloc_percpu(struct virtnet_stats); 1744 err = -ENOMEM; 1745 if (vi->stats == NULL) 1746 goto free; 1747 1748 for_each_possible_cpu(i) { 1749 struct virtnet_stats *virtnet_stats; 1750 virtnet_stats = per_cpu_ptr(vi->stats, i); 1751 u64_stats_init(&virtnet_stats->tx_syncp); 1752 u64_stats_init(&virtnet_stats->rx_syncp); 1753 } 1754 1755 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 1756 1757 /* If we can receive ANY GSO packets, we must allocate large ones. */ 1758 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 1759 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 1760 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 1761 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 1762 vi->big_packets = true; 1763 1764 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 1765 vi->mergeable_rx_bufs = true; 1766 1767 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT)) 1768 vi->any_header_sg = true; 1769 1770 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 1771 vi->has_cvq = true; 1772 1773 if (vi->any_header_sg) { 1774 if (vi->mergeable_rx_bufs) 1775 dev->needed_headroom = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1776 else 1777 dev->needed_headroom = sizeof(struct virtio_net_hdr); 1778 } 1779 1780 /* Use single tx/rx queue pair as default */ 1781 vi->curr_queue_pairs = 1; 1782 vi->max_queue_pairs = max_queue_pairs; 1783 1784 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 1785 err = init_vqs(vi); 1786 if (err) 1787 goto free_stats; 1788 1789 #ifdef CONFIG_SYSFS 1790 if (vi->mergeable_rx_bufs) 1791 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 1792 #endif 1793 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 1794 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 1795 1796 err = register_netdev(dev); 1797 if (err) { 1798 pr_debug("virtio_net: registering device failed\n"); 1799 goto free_vqs; 1800 } 1801 1802 virtio_device_ready(vdev); 1803 1804 /* Last of all, set up some receive buffers. */ 1805 for (i = 0; i < vi->curr_queue_pairs; i++) { 1806 try_fill_recv(&vi->rq[i], GFP_KERNEL); 1807 1808 /* If we didn't even get one input buffer, we're useless. */ 1809 if (vi->rq[i].vq->num_free == 1810 virtqueue_get_vring_size(vi->rq[i].vq)) { 1811 free_unused_bufs(vi); 1812 err = -ENOMEM; 1813 goto free_recv_bufs; 1814 } 1815 } 1816 1817 vi->nb.notifier_call = &virtnet_cpu_callback; 1818 err = register_hotcpu_notifier(&vi->nb); 1819 if (err) { 1820 pr_debug("virtio_net: registering cpu notifier failed\n"); 1821 goto free_recv_bufs; 1822 } 1823 1824 /* Assume link up if device can't report link status, 1825 otherwise get link status from config. */ 1826 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 1827 netif_carrier_off(dev); 1828 schedule_work(&vi->config_work); 1829 } else { 1830 vi->status = VIRTIO_NET_S_LINK_UP; 1831 netif_carrier_on(dev); 1832 } 1833 1834 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 1835 dev->name, max_queue_pairs); 1836 1837 return 0; 1838 1839 free_recv_bufs: 1840 vi->vdev->config->reset(vdev); 1841 1842 free_receive_bufs(vi); 1843 unregister_netdev(dev); 1844 free_vqs: 1845 cancel_delayed_work_sync(&vi->refill); 1846 free_receive_page_frags(vi); 1847 virtnet_del_vqs(vi); 1848 free_stats: 1849 free_percpu(vi->stats); 1850 free: 1851 free_netdev(dev); 1852 return err; 1853 } 1854 1855 static void remove_vq_common(struct virtnet_info *vi) 1856 { 1857 vi->vdev->config->reset(vi->vdev); 1858 1859 /* Free unused buffers in both send and recv, if any. */ 1860 free_unused_bufs(vi); 1861 1862 free_receive_bufs(vi); 1863 1864 free_receive_page_frags(vi); 1865 1866 virtnet_del_vqs(vi); 1867 } 1868 1869 static void virtnet_remove(struct virtio_device *vdev) 1870 { 1871 struct virtnet_info *vi = vdev->priv; 1872 1873 unregister_hotcpu_notifier(&vi->nb); 1874 1875 /* Make sure no work handler is accessing the device. */ 1876 flush_work(&vi->config_work); 1877 1878 unregister_netdev(vi->dev); 1879 1880 remove_vq_common(vi); 1881 1882 free_percpu(vi->stats); 1883 free_netdev(vi->dev); 1884 } 1885 1886 #ifdef CONFIG_PM_SLEEP 1887 static int virtnet_freeze(struct virtio_device *vdev) 1888 { 1889 struct virtnet_info *vi = vdev->priv; 1890 int i; 1891 1892 unregister_hotcpu_notifier(&vi->nb); 1893 1894 /* Make sure no work handler is accessing the device */ 1895 flush_work(&vi->config_work); 1896 1897 netif_device_detach(vi->dev); 1898 cancel_delayed_work_sync(&vi->refill); 1899 1900 if (netif_running(vi->dev)) { 1901 for (i = 0; i < vi->max_queue_pairs; i++) { 1902 napi_disable(&vi->rq[i].napi); 1903 napi_hash_del(&vi->rq[i].napi); 1904 netif_napi_del(&vi->rq[i].napi); 1905 } 1906 } 1907 1908 remove_vq_common(vi); 1909 1910 return 0; 1911 } 1912 1913 static int virtnet_restore(struct virtio_device *vdev) 1914 { 1915 struct virtnet_info *vi = vdev->priv; 1916 int err, i; 1917 1918 err = init_vqs(vi); 1919 if (err) 1920 return err; 1921 1922 virtio_device_ready(vdev); 1923 1924 if (netif_running(vi->dev)) { 1925 for (i = 0; i < vi->curr_queue_pairs; i++) 1926 if (!try_fill_recv(&vi->rq[i], GFP_KERNEL)) 1927 schedule_delayed_work(&vi->refill, 0); 1928 1929 for (i = 0; i < vi->max_queue_pairs; i++) 1930 virtnet_napi_enable(&vi->rq[i]); 1931 } 1932 1933 netif_device_attach(vi->dev); 1934 1935 rtnl_lock(); 1936 virtnet_set_queues(vi, vi->curr_queue_pairs); 1937 rtnl_unlock(); 1938 1939 err = register_hotcpu_notifier(&vi->nb); 1940 if (err) 1941 return err; 1942 1943 return 0; 1944 } 1945 #endif 1946 1947 static struct virtio_device_id id_table[] = { 1948 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 1949 { 0 }, 1950 }; 1951 1952 static unsigned int features[] = { 1953 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, 1954 VIRTIO_NET_F_GSO, VIRTIO_NET_F_MAC, 1955 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, 1956 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, 1957 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, 1958 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, 1959 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, 1960 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, 1961 VIRTIO_NET_F_CTRL_MAC_ADDR, 1962 VIRTIO_F_ANY_LAYOUT, 1963 }; 1964 1965 static struct virtio_driver virtio_net_driver = { 1966 .feature_table = features, 1967 .feature_table_size = ARRAY_SIZE(features), 1968 .driver.name = KBUILD_MODNAME, 1969 .driver.owner = THIS_MODULE, 1970 .id_table = id_table, 1971 .probe = virtnet_probe, 1972 .remove = virtnet_remove, 1973 .config_changed = virtnet_config_changed, 1974 #ifdef CONFIG_PM_SLEEP 1975 .freeze = virtnet_freeze, 1976 .restore = virtnet_restore, 1977 #endif 1978 }; 1979 1980 module_virtio_driver(virtio_net_driver); 1981 1982 MODULE_DEVICE_TABLE(virtio, id_table); 1983 MODULE_DESCRIPTION("Virtio network driver"); 1984 MODULE_LICENSE("GPL"); 1985