1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* A network driver using virtio. 3 * 4 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation 5 */ 6 //#define DEBUG 7 #include <linux/netdevice.h> 8 #include <linux/etherdevice.h> 9 #include <linux/ethtool.h> 10 #include <linux/module.h> 11 #include <linux/virtio.h> 12 #include <linux/virtio_net.h> 13 #include <linux/bpf.h> 14 #include <linux/bpf_trace.h> 15 #include <linux/scatterlist.h> 16 #include <linux/if_vlan.h> 17 #include <linux/slab.h> 18 #include <linux/cpu.h> 19 #include <linux/average.h> 20 #include <linux/filter.h> 21 #include <linux/kernel.h> 22 #include <net/route.h> 23 #include <net/xdp.h> 24 #include <net/net_failover.h> 25 26 static int napi_weight = NAPI_POLL_WEIGHT; 27 module_param(napi_weight, int, 0444); 28 29 static bool csum = true, gso = true, napi_tx = true; 30 module_param(csum, bool, 0444); 31 module_param(gso, bool, 0444); 32 module_param(napi_tx, bool, 0644); 33 34 /* FIXME: MTU in config. */ 35 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) 36 #define GOOD_COPY_LEN 128 37 38 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) 39 40 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ 41 #define VIRTIO_XDP_HEADROOM 256 42 43 /* Separating two types of XDP xmit */ 44 #define VIRTIO_XDP_TX BIT(0) 45 #define VIRTIO_XDP_REDIR BIT(1) 46 47 #define VIRTIO_XDP_FLAG BIT(0) 48 49 /* RX packet size EWMA. The average packet size is used to determine the packet 50 * buffer size when refilling RX rings. As the entire RX ring may be refilled 51 * at once, the weight is chosen so that the EWMA will be insensitive to short- 52 * term, transient changes in packet size. 53 */ 54 DECLARE_EWMA(pkt_len, 0, 64) 55 56 #define VIRTNET_DRIVER_VERSION "1.0.0" 57 58 static const unsigned long guest_offloads[] = { 59 VIRTIO_NET_F_GUEST_TSO4, 60 VIRTIO_NET_F_GUEST_TSO6, 61 VIRTIO_NET_F_GUEST_ECN, 62 VIRTIO_NET_F_GUEST_UFO, 63 VIRTIO_NET_F_GUEST_CSUM 64 }; 65 66 #define GUEST_OFFLOAD_LRO_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ 67 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ 68 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ 69 (1ULL << VIRTIO_NET_F_GUEST_UFO)) 70 71 struct virtnet_stat_desc { 72 char desc[ETH_GSTRING_LEN]; 73 size_t offset; 74 }; 75 76 struct virtnet_sq_stats { 77 struct u64_stats_sync syncp; 78 u64 packets; 79 u64 bytes; 80 u64 xdp_tx; 81 u64 xdp_tx_drops; 82 u64 kicks; 83 }; 84 85 struct virtnet_rq_stats { 86 struct u64_stats_sync syncp; 87 u64 packets; 88 u64 bytes; 89 u64 drops; 90 u64 xdp_packets; 91 u64 xdp_tx; 92 u64 xdp_redirects; 93 u64 xdp_drops; 94 u64 kicks; 95 }; 96 97 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) 98 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) 99 100 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { 101 { "packets", VIRTNET_SQ_STAT(packets) }, 102 { "bytes", VIRTNET_SQ_STAT(bytes) }, 103 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, 104 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, 105 { "kicks", VIRTNET_SQ_STAT(kicks) }, 106 }; 107 108 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { 109 { "packets", VIRTNET_RQ_STAT(packets) }, 110 { "bytes", VIRTNET_RQ_STAT(bytes) }, 111 { "drops", VIRTNET_RQ_STAT(drops) }, 112 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, 113 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, 114 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, 115 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, 116 { "kicks", VIRTNET_RQ_STAT(kicks) }, 117 }; 118 119 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) 120 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) 121 122 /* Internal representation of a send virtqueue */ 123 struct send_queue { 124 /* Virtqueue associated with this send _queue */ 125 struct virtqueue *vq; 126 127 /* TX: fragments + linear part + virtio header */ 128 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 129 130 /* Name of the send queue: output.$index */ 131 char name[40]; 132 133 struct virtnet_sq_stats stats; 134 135 struct napi_struct napi; 136 }; 137 138 /* Internal representation of a receive virtqueue */ 139 struct receive_queue { 140 /* Virtqueue associated with this receive_queue */ 141 struct virtqueue *vq; 142 143 struct napi_struct napi; 144 145 struct bpf_prog __rcu *xdp_prog; 146 147 struct virtnet_rq_stats stats; 148 149 /* Chain pages by the private ptr. */ 150 struct page *pages; 151 152 /* Average packet length for mergeable receive buffers. */ 153 struct ewma_pkt_len mrg_avg_pkt_len; 154 155 /* Page frag for packet buffer allocation. */ 156 struct page_frag alloc_frag; 157 158 /* RX: fragments + linear part + virtio header */ 159 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 160 161 /* Min single buffer size for mergeable buffers case. */ 162 unsigned int min_buf_len; 163 164 /* Name of this receive queue: input.$index */ 165 char name[40]; 166 167 struct xdp_rxq_info xdp_rxq; 168 }; 169 170 /* Control VQ buffers: protected by the rtnl lock */ 171 struct control_buf { 172 struct virtio_net_ctrl_hdr hdr; 173 virtio_net_ctrl_ack status; 174 struct virtio_net_ctrl_mq mq; 175 u8 promisc; 176 u8 allmulti; 177 __virtio16 vid; 178 __virtio64 offloads; 179 }; 180 181 struct virtnet_info { 182 struct virtio_device *vdev; 183 struct virtqueue *cvq; 184 struct net_device *dev; 185 struct send_queue *sq; 186 struct receive_queue *rq; 187 unsigned int status; 188 189 /* Max # of queue pairs supported by the device */ 190 u16 max_queue_pairs; 191 192 /* # of queue pairs currently used by the driver */ 193 u16 curr_queue_pairs; 194 195 /* # of XDP queue pairs currently used by the driver */ 196 u16 xdp_queue_pairs; 197 198 /* I like... big packets and I cannot lie! */ 199 bool big_packets; 200 201 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 202 bool mergeable_rx_bufs; 203 204 /* Has control virtqueue */ 205 bool has_cvq; 206 207 /* Host can handle any s/g split between our header and packet data */ 208 bool any_header_sg; 209 210 /* Packet virtio header size */ 211 u8 hdr_len; 212 213 /* Work struct for refilling if we run low on memory. */ 214 struct delayed_work refill; 215 216 /* Work struct for config space updates */ 217 struct work_struct config_work; 218 219 /* Does the affinity hint is set for virtqueues? */ 220 bool affinity_hint_set; 221 222 /* CPU hotplug instances for online & dead */ 223 struct hlist_node node; 224 struct hlist_node node_dead; 225 226 struct control_buf *ctrl; 227 228 /* Ethtool settings */ 229 u8 duplex; 230 u32 speed; 231 232 unsigned long guest_offloads; 233 unsigned long guest_offloads_capable; 234 235 /* failover when STANDBY feature enabled */ 236 struct failover *failover; 237 }; 238 239 struct padded_vnet_hdr { 240 struct virtio_net_hdr_mrg_rxbuf hdr; 241 /* 242 * hdr is in a separate sg buffer, and data sg buffer shares same page 243 * with this header sg. This padding makes next sg 16 byte aligned 244 * after the header. 245 */ 246 char padding[4]; 247 }; 248 249 static bool is_xdp_frame(void *ptr) 250 { 251 return (unsigned long)ptr & VIRTIO_XDP_FLAG; 252 } 253 254 static void *xdp_to_ptr(struct xdp_frame *ptr) 255 { 256 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); 257 } 258 259 static struct xdp_frame *ptr_to_xdp(void *ptr) 260 { 261 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); 262 } 263 264 /* Converting between virtqueue no. and kernel tx/rx queue no. 265 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 266 */ 267 static int vq2txq(struct virtqueue *vq) 268 { 269 return (vq->index - 1) / 2; 270 } 271 272 static int txq2vq(int txq) 273 { 274 return txq * 2 + 1; 275 } 276 277 static int vq2rxq(struct virtqueue *vq) 278 { 279 return vq->index / 2; 280 } 281 282 static int rxq2vq(int rxq) 283 { 284 return rxq * 2; 285 } 286 287 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 288 { 289 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 290 } 291 292 /* 293 * private is used to chain pages for big packets, put the whole 294 * most recent used list in the beginning for reuse 295 */ 296 static void give_pages(struct receive_queue *rq, struct page *page) 297 { 298 struct page *end; 299 300 /* Find end of list, sew whole thing into vi->rq.pages. */ 301 for (end = page; end->private; end = (struct page *)end->private); 302 end->private = (unsigned long)rq->pages; 303 rq->pages = page; 304 } 305 306 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 307 { 308 struct page *p = rq->pages; 309 310 if (p) { 311 rq->pages = (struct page *)p->private; 312 /* clear private here, it is used to chain pages */ 313 p->private = 0; 314 } else 315 p = alloc_page(gfp_mask); 316 return p; 317 } 318 319 static void virtqueue_napi_schedule(struct napi_struct *napi, 320 struct virtqueue *vq) 321 { 322 if (napi_schedule_prep(napi)) { 323 virtqueue_disable_cb(vq); 324 __napi_schedule(napi); 325 } 326 } 327 328 static void virtqueue_napi_complete(struct napi_struct *napi, 329 struct virtqueue *vq, int processed) 330 { 331 int opaque; 332 333 opaque = virtqueue_enable_cb_prepare(vq); 334 if (napi_complete_done(napi, processed)) { 335 if (unlikely(virtqueue_poll(vq, opaque))) 336 virtqueue_napi_schedule(napi, vq); 337 } else { 338 virtqueue_disable_cb(vq); 339 } 340 } 341 342 static void skb_xmit_done(struct virtqueue *vq) 343 { 344 struct virtnet_info *vi = vq->vdev->priv; 345 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; 346 347 /* Suppress further interrupts. */ 348 virtqueue_disable_cb(vq); 349 350 if (napi->weight) 351 virtqueue_napi_schedule(napi, vq); 352 else 353 /* We were probably waiting for more output buffers. */ 354 netif_wake_subqueue(vi->dev, vq2txq(vq)); 355 } 356 357 #define MRG_CTX_HEADER_SHIFT 22 358 static void *mergeable_len_to_ctx(unsigned int truesize, 359 unsigned int headroom) 360 { 361 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); 362 } 363 364 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) 365 { 366 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; 367 } 368 369 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) 370 { 371 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); 372 } 373 374 /* Called from bottom half context */ 375 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 376 struct receive_queue *rq, 377 struct page *page, unsigned int offset, 378 unsigned int len, unsigned int truesize, 379 bool hdr_valid, unsigned int metasize) 380 { 381 struct sk_buff *skb; 382 struct virtio_net_hdr_mrg_rxbuf *hdr; 383 unsigned int copy, hdr_len, hdr_padded_len; 384 char *p; 385 386 p = page_address(page) + offset; 387 388 /* copy small packet so we can reuse these pages for small data */ 389 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 390 if (unlikely(!skb)) 391 return NULL; 392 393 hdr = skb_vnet_hdr(skb); 394 395 hdr_len = vi->hdr_len; 396 if (vi->mergeable_rx_bufs) 397 hdr_padded_len = sizeof(*hdr); 398 else 399 hdr_padded_len = sizeof(struct padded_vnet_hdr); 400 401 /* hdr_valid means no XDP, so we can copy the vnet header */ 402 if (hdr_valid) 403 memcpy(hdr, p, hdr_len); 404 405 len -= hdr_len; 406 offset += hdr_padded_len; 407 p += hdr_padded_len; 408 409 copy = len; 410 if (copy > skb_tailroom(skb)) 411 copy = skb_tailroom(skb); 412 skb_put_data(skb, p, copy); 413 414 if (metasize) { 415 __skb_pull(skb, metasize); 416 skb_metadata_set(skb, metasize); 417 } 418 419 len -= copy; 420 offset += copy; 421 422 if (vi->mergeable_rx_bufs) { 423 if (len) 424 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 425 else 426 put_page(page); 427 return skb; 428 } 429 430 /* 431 * Verify that we can indeed put this data into a skb. 432 * This is here to handle cases when the device erroneously 433 * tries to receive more than is possible. This is usually 434 * the case of a broken device. 435 */ 436 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 437 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 438 dev_kfree_skb(skb); 439 return NULL; 440 } 441 BUG_ON(offset >= PAGE_SIZE); 442 while (len) { 443 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 444 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 445 frag_size, truesize); 446 len -= frag_size; 447 page = (struct page *)page->private; 448 offset = 0; 449 } 450 451 if (page) 452 give_pages(rq, page); 453 454 return skb; 455 } 456 457 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, 458 struct send_queue *sq, 459 struct xdp_frame *xdpf) 460 { 461 struct virtio_net_hdr_mrg_rxbuf *hdr; 462 int err; 463 464 if (unlikely(xdpf->headroom < vi->hdr_len)) 465 return -EOVERFLOW; 466 467 /* Make room for virtqueue hdr (also change xdpf->headroom?) */ 468 xdpf->data -= vi->hdr_len; 469 /* Zero header and leave csum up to XDP layers */ 470 hdr = xdpf->data; 471 memset(hdr, 0, vi->hdr_len); 472 xdpf->len += vi->hdr_len; 473 474 sg_init_one(sq->sg, xdpf->data, xdpf->len); 475 476 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdp_to_ptr(xdpf), 477 GFP_ATOMIC); 478 if (unlikely(err)) 479 return -ENOSPC; /* Caller handle free/refcnt */ 480 481 return 0; 482 } 483 484 static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi) 485 { 486 unsigned int qp; 487 488 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); 489 return &vi->sq[qp]; 490 } 491 492 static int virtnet_xdp_xmit(struct net_device *dev, 493 int n, struct xdp_frame **frames, u32 flags) 494 { 495 struct virtnet_info *vi = netdev_priv(dev); 496 struct receive_queue *rq = vi->rq; 497 struct bpf_prog *xdp_prog; 498 struct send_queue *sq; 499 unsigned int len; 500 int packets = 0; 501 int bytes = 0; 502 int drops = 0; 503 int kicks = 0; 504 int ret, err; 505 void *ptr; 506 int i; 507 508 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this 509 * indicate XDP resources have been successfully allocated. 510 */ 511 xdp_prog = rcu_access_pointer(rq->xdp_prog); 512 if (!xdp_prog) 513 return -ENXIO; 514 515 sq = virtnet_xdp_sq(vi); 516 517 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { 518 ret = -EINVAL; 519 drops = n; 520 goto out; 521 } 522 523 /* Free up any pending old buffers before queueing new ones. */ 524 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 525 if (likely(is_xdp_frame(ptr))) { 526 struct xdp_frame *frame = ptr_to_xdp(ptr); 527 528 bytes += frame->len; 529 xdp_return_frame(frame); 530 } else { 531 struct sk_buff *skb = ptr; 532 533 bytes += skb->len; 534 napi_consume_skb(skb, false); 535 } 536 packets++; 537 } 538 539 for (i = 0; i < n; i++) { 540 struct xdp_frame *xdpf = frames[i]; 541 542 err = __virtnet_xdp_xmit_one(vi, sq, xdpf); 543 if (err) { 544 xdp_return_frame_rx_napi(xdpf); 545 drops++; 546 } 547 } 548 ret = n - drops; 549 550 if (flags & XDP_XMIT_FLUSH) { 551 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 552 kicks = 1; 553 } 554 out: 555 u64_stats_update_begin(&sq->stats.syncp); 556 sq->stats.bytes += bytes; 557 sq->stats.packets += packets; 558 sq->stats.xdp_tx += n; 559 sq->stats.xdp_tx_drops += drops; 560 sq->stats.kicks += kicks; 561 u64_stats_update_end(&sq->stats.syncp); 562 563 return ret; 564 } 565 566 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 567 { 568 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; 569 } 570 571 /* We copy the packet for XDP in the following cases: 572 * 573 * 1) Packet is scattered across multiple rx buffers. 574 * 2) Headroom space is insufficient. 575 * 576 * This is inefficient but it's a temporary condition that 577 * we hit right after XDP is enabled and until queue is refilled 578 * with large buffers with sufficient headroom - so it should affect 579 * at most queue size packets. 580 * Afterwards, the conditions to enable 581 * XDP should preclude the underlying device from sending packets 582 * across multiple buffers (num_buf > 1), and we make sure buffers 583 * have enough headroom. 584 */ 585 static struct page *xdp_linearize_page(struct receive_queue *rq, 586 u16 *num_buf, 587 struct page *p, 588 int offset, 589 int page_off, 590 unsigned int *len) 591 { 592 struct page *page = alloc_page(GFP_ATOMIC); 593 594 if (!page) 595 return NULL; 596 597 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 598 page_off += *len; 599 600 while (--*num_buf) { 601 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 602 unsigned int buflen; 603 void *buf; 604 int off; 605 606 buf = virtqueue_get_buf(rq->vq, &buflen); 607 if (unlikely(!buf)) 608 goto err_buf; 609 610 p = virt_to_head_page(buf); 611 off = buf - page_address(p); 612 613 /* guard against a misconfigured or uncooperative backend that 614 * is sending packet larger than the MTU. 615 */ 616 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 617 put_page(p); 618 goto err_buf; 619 } 620 621 memcpy(page_address(page) + page_off, 622 page_address(p) + off, buflen); 623 page_off += buflen; 624 put_page(p); 625 } 626 627 /* Headroom does not contribute to packet length */ 628 *len = page_off - VIRTIO_XDP_HEADROOM; 629 return page; 630 err_buf: 631 __free_pages(page, 0); 632 return NULL; 633 } 634 635 static struct sk_buff *receive_small(struct net_device *dev, 636 struct virtnet_info *vi, 637 struct receive_queue *rq, 638 void *buf, void *ctx, 639 unsigned int len, 640 unsigned int *xdp_xmit, 641 struct virtnet_rq_stats *stats) 642 { 643 struct sk_buff *skb; 644 struct bpf_prog *xdp_prog; 645 unsigned int xdp_headroom = (unsigned long)ctx; 646 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 647 unsigned int headroom = vi->hdr_len + header_offset; 648 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 649 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 650 struct page *page = virt_to_head_page(buf); 651 unsigned int delta = 0; 652 struct page *xdp_page; 653 int err; 654 unsigned int metasize = 0; 655 656 len -= vi->hdr_len; 657 stats->bytes += len; 658 659 rcu_read_lock(); 660 xdp_prog = rcu_dereference(rq->xdp_prog); 661 if (xdp_prog) { 662 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 663 struct xdp_frame *xdpf; 664 struct xdp_buff xdp; 665 void *orig_data; 666 u32 act; 667 668 if (unlikely(hdr->hdr.gso_type)) 669 goto err_xdp; 670 671 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 672 int offset = buf - page_address(page) + header_offset; 673 unsigned int tlen = len + vi->hdr_len; 674 u16 num_buf = 1; 675 676 xdp_headroom = virtnet_get_headroom(vi); 677 header_offset = VIRTNET_RX_PAD + xdp_headroom; 678 headroom = vi->hdr_len + header_offset; 679 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 680 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 681 xdp_page = xdp_linearize_page(rq, &num_buf, page, 682 offset, header_offset, 683 &tlen); 684 if (!xdp_page) 685 goto err_xdp; 686 687 buf = page_address(xdp_page); 688 put_page(page); 689 page = xdp_page; 690 } 691 692 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; 693 xdp.data = xdp.data_hard_start + xdp_headroom; 694 xdp.data_end = xdp.data + len; 695 xdp.data_meta = xdp.data; 696 xdp.rxq = &rq->xdp_rxq; 697 xdp.frame_sz = buflen; 698 orig_data = xdp.data; 699 act = bpf_prog_run_xdp(xdp_prog, &xdp); 700 stats->xdp_packets++; 701 702 switch (act) { 703 case XDP_PASS: 704 /* Recalculate length in case bpf program changed it */ 705 delta = orig_data - xdp.data; 706 len = xdp.data_end - xdp.data; 707 metasize = xdp.data - xdp.data_meta; 708 break; 709 case XDP_TX: 710 stats->xdp_tx++; 711 xdpf = xdp_convert_buff_to_frame(&xdp); 712 if (unlikely(!xdpf)) 713 goto err_xdp; 714 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 715 if (unlikely(err < 0)) { 716 trace_xdp_exception(vi->dev, xdp_prog, act); 717 goto err_xdp; 718 } 719 *xdp_xmit |= VIRTIO_XDP_TX; 720 rcu_read_unlock(); 721 goto xdp_xmit; 722 case XDP_REDIRECT: 723 stats->xdp_redirects++; 724 err = xdp_do_redirect(dev, &xdp, xdp_prog); 725 if (err) 726 goto err_xdp; 727 *xdp_xmit |= VIRTIO_XDP_REDIR; 728 rcu_read_unlock(); 729 goto xdp_xmit; 730 default: 731 bpf_warn_invalid_xdp_action(act); 732 fallthrough; 733 case XDP_ABORTED: 734 trace_xdp_exception(vi->dev, xdp_prog, act); 735 case XDP_DROP: 736 goto err_xdp; 737 } 738 } 739 rcu_read_unlock(); 740 741 skb = build_skb(buf, buflen); 742 if (!skb) { 743 put_page(page); 744 goto err; 745 } 746 skb_reserve(skb, headroom - delta); 747 skb_put(skb, len); 748 if (!xdp_prog) { 749 buf += header_offset; 750 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 751 } /* keep zeroed vnet hdr since XDP is loaded */ 752 753 if (metasize) 754 skb_metadata_set(skb, metasize); 755 756 err: 757 return skb; 758 759 err_xdp: 760 rcu_read_unlock(); 761 stats->xdp_drops++; 762 stats->drops++; 763 put_page(page); 764 xdp_xmit: 765 return NULL; 766 } 767 768 static struct sk_buff *receive_big(struct net_device *dev, 769 struct virtnet_info *vi, 770 struct receive_queue *rq, 771 void *buf, 772 unsigned int len, 773 struct virtnet_rq_stats *stats) 774 { 775 struct page *page = buf; 776 struct sk_buff *skb = 777 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0); 778 779 stats->bytes += len - vi->hdr_len; 780 if (unlikely(!skb)) 781 goto err; 782 783 return skb; 784 785 err: 786 stats->drops++; 787 give_pages(rq, page); 788 return NULL; 789 } 790 791 static struct sk_buff *receive_mergeable(struct net_device *dev, 792 struct virtnet_info *vi, 793 struct receive_queue *rq, 794 void *buf, 795 void *ctx, 796 unsigned int len, 797 unsigned int *xdp_xmit, 798 struct virtnet_rq_stats *stats) 799 { 800 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 801 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 802 struct page *page = virt_to_head_page(buf); 803 int offset = buf - page_address(page); 804 struct sk_buff *head_skb, *curr_skb; 805 struct bpf_prog *xdp_prog; 806 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 807 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 808 unsigned int metasize = 0; 809 unsigned int frame_sz; 810 int err; 811 812 head_skb = NULL; 813 stats->bytes += len - vi->hdr_len; 814 815 rcu_read_lock(); 816 xdp_prog = rcu_dereference(rq->xdp_prog); 817 if (xdp_prog) { 818 struct xdp_frame *xdpf; 819 struct page *xdp_page; 820 struct xdp_buff xdp; 821 void *data; 822 u32 act; 823 824 /* Transient failure which in theory could occur if 825 * in-flight packets from before XDP was enabled reach 826 * the receive path after XDP is loaded. 827 */ 828 if (unlikely(hdr->hdr.gso_type)) 829 goto err_xdp; 830 831 /* Buffers with headroom use PAGE_SIZE as alloc size, 832 * see add_recvbuf_mergeable() + get_mergeable_buf_len() 833 */ 834 frame_sz = headroom ? PAGE_SIZE : truesize; 835 836 /* This happens when rx buffer size is underestimated 837 * or headroom is not enough because of the buffer 838 * was refilled before XDP is set. This should only 839 * happen for the first several packets, so we don't 840 * care much about its performance. 841 */ 842 if (unlikely(num_buf > 1 || 843 headroom < virtnet_get_headroom(vi))) { 844 /* linearize data for XDP */ 845 xdp_page = xdp_linearize_page(rq, &num_buf, 846 page, offset, 847 VIRTIO_XDP_HEADROOM, 848 &len); 849 frame_sz = PAGE_SIZE; 850 851 if (!xdp_page) 852 goto err_xdp; 853 offset = VIRTIO_XDP_HEADROOM; 854 } else { 855 xdp_page = page; 856 } 857 858 /* Allow consuming headroom but reserve enough space to push 859 * the descriptor on if we get an XDP_TX return code. 860 */ 861 data = page_address(xdp_page) + offset; 862 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; 863 xdp.data = data + vi->hdr_len; 864 xdp.data_end = xdp.data + (len - vi->hdr_len); 865 xdp.data_meta = xdp.data; 866 xdp.rxq = &rq->xdp_rxq; 867 xdp.frame_sz = frame_sz - vi->hdr_len; 868 869 act = bpf_prog_run_xdp(xdp_prog, &xdp); 870 stats->xdp_packets++; 871 872 switch (act) { 873 case XDP_PASS: 874 metasize = xdp.data - xdp.data_meta; 875 876 /* recalculate offset to account for any header 877 * adjustments and minus the metasize to copy the 878 * metadata in page_to_skb(). Note other cases do not 879 * build an skb and avoid using offset 880 */ 881 offset = xdp.data - page_address(xdp_page) - 882 vi->hdr_len - metasize; 883 884 /* recalculate len if xdp.data, xdp.data_end or 885 * xdp.data_meta were adjusted 886 */ 887 len = xdp.data_end - xdp.data + vi->hdr_len + metasize; 888 /* We can only create skb based on xdp_page. */ 889 if (unlikely(xdp_page != page)) { 890 rcu_read_unlock(); 891 put_page(page); 892 head_skb = page_to_skb(vi, rq, xdp_page, offset, 893 len, PAGE_SIZE, false, 894 metasize); 895 return head_skb; 896 } 897 break; 898 case XDP_TX: 899 stats->xdp_tx++; 900 xdpf = xdp_convert_buff_to_frame(&xdp); 901 if (unlikely(!xdpf)) 902 goto err_xdp; 903 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 904 if (unlikely(err < 0)) { 905 trace_xdp_exception(vi->dev, xdp_prog, act); 906 if (unlikely(xdp_page != page)) 907 put_page(xdp_page); 908 goto err_xdp; 909 } 910 *xdp_xmit |= VIRTIO_XDP_TX; 911 if (unlikely(xdp_page != page)) 912 put_page(page); 913 rcu_read_unlock(); 914 goto xdp_xmit; 915 case XDP_REDIRECT: 916 stats->xdp_redirects++; 917 err = xdp_do_redirect(dev, &xdp, xdp_prog); 918 if (err) { 919 if (unlikely(xdp_page != page)) 920 put_page(xdp_page); 921 goto err_xdp; 922 } 923 *xdp_xmit |= VIRTIO_XDP_REDIR; 924 if (unlikely(xdp_page != page)) 925 put_page(page); 926 rcu_read_unlock(); 927 goto xdp_xmit; 928 default: 929 bpf_warn_invalid_xdp_action(act); 930 fallthrough; 931 case XDP_ABORTED: 932 trace_xdp_exception(vi->dev, xdp_prog, act); 933 fallthrough; 934 case XDP_DROP: 935 if (unlikely(xdp_page != page)) 936 __free_pages(xdp_page, 0); 937 goto err_xdp; 938 } 939 } 940 rcu_read_unlock(); 941 942 if (unlikely(len > truesize)) { 943 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 944 dev->name, len, (unsigned long)ctx); 945 dev->stats.rx_length_errors++; 946 goto err_skb; 947 } 948 949 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog, 950 metasize); 951 curr_skb = head_skb; 952 953 if (unlikely(!curr_skb)) 954 goto err_skb; 955 while (--num_buf) { 956 int num_skb_frags; 957 958 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 959 if (unlikely(!buf)) { 960 pr_debug("%s: rx error: %d buffers out of %d missing\n", 961 dev->name, num_buf, 962 virtio16_to_cpu(vi->vdev, 963 hdr->num_buffers)); 964 dev->stats.rx_length_errors++; 965 goto err_buf; 966 } 967 968 stats->bytes += len; 969 page = virt_to_head_page(buf); 970 971 truesize = mergeable_ctx_to_truesize(ctx); 972 if (unlikely(len > truesize)) { 973 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 974 dev->name, len, (unsigned long)ctx); 975 dev->stats.rx_length_errors++; 976 goto err_skb; 977 } 978 979 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 980 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 981 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 982 983 if (unlikely(!nskb)) 984 goto err_skb; 985 if (curr_skb == head_skb) 986 skb_shinfo(curr_skb)->frag_list = nskb; 987 else 988 curr_skb->next = nskb; 989 curr_skb = nskb; 990 head_skb->truesize += nskb->truesize; 991 num_skb_frags = 0; 992 } 993 if (curr_skb != head_skb) { 994 head_skb->data_len += len; 995 head_skb->len += len; 996 head_skb->truesize += truesize; 997 } 998 offset = buf - page_address(page); 999 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 1000 put_page(page); 1001 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 1002 len, truesize); 1003 } else { 1004 skb_add_rx_frag(curr_skb, num_skb_frags, page, 1005 offset, len, truesize); 1006 } 1007 } 1008 1009 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 1010 return head_skb; 1011 1012 err_xdp: 1013 rcu_read_unlock(); 1014 stats->xdp_drops++; 1015 err_skb: 1016 put_page(page); 1017 while (num_buf-- > 1) { 1018 buf = virtqueue_get_buf(rq->vq, &len); 1019 if (unlikely(!buf)) { 1020 pr_debug("%s: rx error: %d buffers missing\n", 1021 dev->name, num_buf); 1022 dev->stats.rx_length_errors++; 1023 break; 1024 } 1025 stats->bytes += len; 1026 page = virt_to_head_page(buf); 1027 put_page(page); 1028 } 1029 err_buf: 1030 stats->drops++; 1031 dev_kfree_skb(head_skb); 1032 xdp_xmit: 1033 return NULL; 1034 } 1035 1036 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 1037 void *buf, unsigned int len, void **ctx, 1038 unsigned int *xdp_xmit, 1039 struct virtnet_rq_stats *stats) 1040 { 1041 struct net_device *dev = vi->dev; 1042 struct sk_buff *skb; 1043 struct virtio_net_hdr_mrg_rxbuf *hdr; 1044 1045 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1046 pr_debug("%s: short packet %i\n", dev->name, len); 1047 dev->stats.rx_length_errors++; 1048 if (vi->mergeable_rx_bufs) { 1049 put_page(virt_to_head_page(buf)); 1050 } else if (vi->big_packets) { 1051 give_pages(rq, buf); 1052 } else { 1053 put_page(virt_to_head_page(buf)); 1054 } 1055 return; 1056 } 1057 1058 if (vi->mergeable_rx_bufs) 1059 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1060 stats); 1061 else if (vi->big_packets) 1062 skb = receive_big(dev, vi, rq, buf, len, stats); 1063 else 1064 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1065 1066 if (unlikely(!skb)) 1067 return; 1068 1069 hdr = skb_vnet_hdr(skb); 1070 1071 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1072 skb->ip_summed = CHECKSUM_UNNECESSARY; 1073 1074 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1075 virtio_is_little_endian(vi->vdev))) { 1076 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1077 dev->name, hdr->hdr.gso_type, 1078 hdr->hdr.gso_size); 1079 goto frame_err; 1080 } 1081 1082 skb_record_rx_queue(skb, vq2rxq(rq->vq)); 1083 skb->protocol = eth_type_trans(skb, dev); 1084 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1085 ntohs(skb->protocol), skb->len, skb->pkt_type); 1086 1087 napi_gro_receive(&rq->napi, skb); 1088 return; 1089 1090 frame_err: 1091 dev->stats.rx_frame_errors++; 1092 dev_kfree_skb(skb); 1093 } 1094 1095 /* Unlike mergeable buffers, all buffers are allocated to the 1096 * same size, except for the headroom. For this reason we do 1097 * not need to use mergeable_len_to_ctx here - it is enough 1098 * to store the headroom as the context ignoring the truesize. 1099 */ 1100 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1101 gfp_t gfp) 1102 { 1103 struct page_frag *alloc_frag = &rq->alloc_frag; 1104 char *buf; 1105 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1106 void *ctx = (void *)(unsigned long)xdp_headroom; 1107 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1108 int err; 1109 1110 len = SKB_DATA_ALIGN(len) + 1111 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1112 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1113 return -ENOMEM; 1114 1115 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1116 get_page(alloc_frag->page); 1117 alloc_frag->offset += len; 1118 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1119 vi->hdr_len + GOOD_PACKET_LEN); 1120 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1121 if (err < 0) 1122 put_page(virt_to_head_page(buf)); 1123 return err; 1124 } 1125 1126 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1127 gfp_t gfp) 1128 { 1129 struct page *first, *list = NULL; 1130 char *p; 1131 int i, err, offset; 1132 1133 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 1134 1135 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 1136 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 1137 first = get_a_page(rq, gfp); 1138 if (!first) { 1139 if (list) 1140 give_pages(rq, list); 1141 return -ENOMEM; 1142 } 1143 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1144 1145 /* chain new page in list head to match sg */ 1146 first->private = (unsigned long)list; 1147 list = first; 1148 } 1149 1150 first = get_a_page(rq, gfp); 1151 if (!first) { 1152 give_pages(rq, list); 1153 return -ENOMEM; 1154 } 1155 p = page_address(first); 1156 1157 /* rq->sg[0], rq->sg[1] share the same page */ 1158 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1159 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1160 1161 /* rq->sg[1] for data packet, from offset */ 1162 offset = sizeof(struct padded_vnet_hdr); 1163 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1164 1165 /* chain first in list head */ 1166 first->private = (unsigned long)list; 1167 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 1168 first, gfp); 1169 if (err < 0) 1170 give_pages(rq, first); 1171 1172 return err; 1173 } 1174 1175 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1176 struct ewma_pkt_len *avg_pkt_len, 1177 unsigned int room) 1178 { 1179 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1180 unsigned int len; 1181 1182 if (room) 1183 return PAGE_SIZE - room; 1184 1185 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1186 rq->min_buf_len, PAGE_SIZE - hdr_len); 1187 1188 return ALIGN(len, L1_CACHE_BYTES); 1189 } 1190 1191 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1192 struct receive_queue *rq, gfp_t gfp) 1193 { 1194 struct page_frag *alloc_frag = &rq->alloc_frag; 1195 unsigned int headroom = virtnet_get_headroom(vi); 1196 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1197 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1198 char *buf; 1199 void *ctx; 1200 int err; 1201 unsigned int len, hole; 1202 1203 /* Extra tailroom is needed to satisfy XDP's assumption. This 1204 * means rx frags coalescing won't work, but consider we've 1205 * disabled GSO for XDP, it won't be a big issue. 1206 */ 1207 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1208 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1209 return -ENOMEM; 1210 1211 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1212 buf += headroom; /* advance address leaving hole at front of pkt */ 1213 get_page(alloc_frag->page); 1214 alloc_frag->offset += len + room; 1215 hole = alloc_frag->size - alloc_frag->offset; 1216 if (hole < len + room) { 1217 /* To avoid internal fragmentation, if there is very likely not 1218 * enough space for another buffer, add the remaining space to 1219 * the current buffer. 1220 */ 1221 len += hole; 1222 alloc_frag->offset += hole; 1223 } 1224 1225 sg_init_one(rq->sg, buf, len); 1226 ctx = mergeable_len_to_ctx(len, headroom); 1227 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1228 if (err < 0) 1229 put_page(virt_to_head_page(buf)); 1230 1231 return err; 1232 } 1233 1234 /* 1235 * Returns false if we couldn't fill entirely (OOM). 1236 * 1237 * Normally run in the receive path, but can also be run from ndo_open 1238 * before we're receiving packets, or from refill_work which is 1239 * careful to disable receiving (using napi_disable). 1240 */ 1241 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1242 gfp_t gfp) 1243 { 1244 int err; 1245 bool oom; 1246 1247 do { 1248 if (vi->mergeable_rx_bufs) 1249 err = add_recvbuf_mergeable(vi, rq, gfp); 1250 else if (vi->big_packets) 1251 err = add_recvbuf_big(vi, rq, gfp); 1252 else 1253 err = add_recvbuf_small(vi, rq, gfp); 1254 1255 oom = err == -ENOMEM; 1256 if (err) 1257 break; 1258 } while (rq->vq->num_free); 1259 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1260 unsigned long flags; 1261 1262 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); 1263 rq->stats.kicks++; 1264 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); 1265 } 1266 1267 return !oom; 1268 } 1269 1270 static void skb_recv_done(struct virtqueue *rvq) 1271 { 1272 struct virtnet_info *vi = rvq->vdev->priv; 1273 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1274 1275 virtqueue_napi_schedule(&rq->napi, rvq); 1276 } 1277 1278 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1279 { 1280 napi_enable(napi); 1281 1282 /* If all buffers were filled by other side before we napi_enabled, we 1283 * won't get another interrupt, so process any outstanding packets now. 1284 * Call local_bh_enable after to trigger softIRQ processing. 1285 */ 1286 local_bh_disable(); 1287 virtqueue_napi_schedule(napi, vq); 1288 local_bh_enable(); 1289 } 1290 1291 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1292 struct virtqueue *vq, 1293 struct napi_struct *napi) 1294 { 1295 if (!napi->weight) 1296 return; 1297 1298 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1299 * enable the feature if this is likely affine with the transmit path. 1300 */ 1301 if (!vi->affinity_hint_set) { 1302 napi->weight = 0; 1303 return; 1304 } 1305 1306 return virtnet_napi_enable(vq, napi); 1307 } 1308 1309 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1310 { 1311 if (napi->weight) 1312 napi_disable(napi); 1313 } 1314 1315 static void refill_work(struct work_struct *work) 1316 { 1317 struct virtnet_info *vi = 1318 container_of(work, struct virtnet_info, refill.work); 1319 bool still_empty; 1320 int i; 1321 1322 for (i = 0; i < vi->curr_queue_pairs; i++) { 1323 struct receive_queue *rq = &vi->rq[i]; 1324 1325 napi_disable(&rq->napi); 1326 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1327 virtnet_napi_enable(rq->vq, &rq->napi); 1328 1329 /* In theory, this can happen: if we don't get any buffers in 1330 * we will *never* try to fill again. 1331 */ 1332 if (still_empty) 1333 schedule_delayed_work(&vi->refill, HZ/2); 1334 } 1335 } 1336 1337 static int virtnet_receive(struct receive_queue *rq, int budget, 1338 unsigned int *xdp_xmit) 1339 { 1340 struct virtnet_info *vi = rq->vq->vdev->priv; 1341 struct virtnet_rq_stats stats = {}; 1342 unsigned int len; 1343 void *buf; 1344 int i; 1345 1346 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1347 void *ctx; 1348 1349 while (stats.packets < budget && 1350 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1351 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1352 stats.packets++; 1353 } 1354 } else { 1355 while (stats.packets < budget && 1356 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1357 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1358 stats.packets++; 1359 } 1360 } 1361 1362 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { 1363 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) 1364 schedule_delayed_work(&vi->refill, 0); 1365 } 1366 1367 u64_stats_update_begin(&rq->stats.syncp); 1368 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1369 size_t offset = virtnet_rq_stats_desc[i].offset; 1370 u64 *item; 1371 1372 item = (u64 *)((u8 *)&rq->stats + offset); 1373 *item += *(u64 *)((u8 *)&stats + offset); 1374 } 1375 u64_stats_update_end(&rq->stats.syncp); 1376 1377 return stats.packets; 1378 } 1379 1380 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) 1381 { 1382 unsigned int len; 1383 unsigned int packets = 0; 1384 unsigned int bytes = 0; 1385 void *ptr; 1386 1387 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 1388 if (likely(!is_xdp_frame(ptr))) { 1389 struct sk_buff *skb = ptr; 1390 1391 pr_debug("Sent skb %p\n", skb); 1392 1393 bytes += skb->len; 1394 napi_consume_skb(skb, in_napi); 1395 } else { 1396 struct xdp_frame *frame = ptr_to_xdp(ptr); 1397 1398 bytes += frame->len; 1399 xdp_return_frame(frame); 1400 } 1401 packets++; 1402 } 1403 1404 /* Avoid overhead when no packets have been processed 1405 * happens when called speculatively from start_xmit. 1406 */ 1407 if (!packets) 1408 return; 1409 1410 u64_stats_update_begin(&sq->stats.syncp); 1411 sq->stats.bytes += bytes; 1412 sq->stats.packets += packets; 1413 u64_stats_update_end(&sq->stats.syncp); 1414 } 1415 1416 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) 1417 { 1418 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) 1419 return false; 1420 else if (q < vi->curr_queue_pairs) 1421 return true; 1422 else 1423 return false; 1424 } 1425 1426 static void virtnet_poll_cleantx(struct receive_queue *rq) 1427 { 1428 struct virtnet_info *vi = rq->vq->vdev->priv; 1429 unsigned int index = vq2rxq(rq->vq); 1430 struct send_queue *sq = &vi->sq[index]; 1431 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1432 1433 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) 1434 return; 1435 1436 if (__netif_tx_trylock(txq)) { 1437 free_old_xmit_skbs(sq, true); 1438 __netif_tx_unlock(txq); 1439 } 1440 1441 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1442 netif_tx_wake_queue(txq); 1443 } 1444 1445 static int virtnet_poll(struct napi_struct *napi, int budget) 1446 { 1447 struct receive_queue *rq = 1448 container_of(napi, struct receive_queue, napi); 1449 struct virtnet_info *vi = rq->vq->vdev->priv; 1450 struct send_queue *sq; 1451 unsigned int received; 1452 unsigned int xdp_xmit = 0; 1453 1454 virtnet_poll_cleantx(rq); 1455 1456 received = virtnet_receive(rq, budget, &xdp_xmit); 1457 1458 /* Out of packets? */ 1459 if (received < budget) 1460 virtqueue_napi_complete(napi, rq->vq, received); 1461 1462 if (xdp_xmit & VIRTIO_XDP_REDIR) 1463 xdp_do_flush(); 1464 1465 if (xdp_xmit & VIRTIO_XDP_TX) { 1466 sq = virtnet_xdp_sq(vi); 1467 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1468 u64_stats_update_begin(&sq->stats.syncp); 1469 sq->stats.kicks++; 1470 u64_stats_update_end(&sq->stats.syncp); 1471 } 1472 } 1473 1474 return received; 1475 } 1476 1477 static int virtnet_open(struct net_device *dev) 1478 { 1479 struct virtnet_info *vi = netdev_priv(dev); 1480 int i, err; 1481 1482 for (i = 0; i < vi->max_queue_pairs; i++) { 1483 if (i < vi->curr_queue_pairs) 1484 /* Make sure we have some buffers: if oom use wq. */ 1485 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1486 schedule_delayed_work(&vi->refill, 0); 1487 1488 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i); 1489 if (err < 0) 1490 return err; 1491 1492 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, 1493 MEM_TYPE_PAGE_SHARED, NULL); 1494 if (err < 0) { 1495 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1496 return err; 1497 } 1498 1499 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 1500 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); 1501 } 1502 1503 return 0; 1504 } 1505 1506 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1507 { 1508 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1509 struct virtnet_info *vi = sq->vq->vdev->priv; 1510 unsigned int index = vq2txq(sq->vq); 1511 struct netdev_queue *txq; 1512 1513 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { 1514 /* We don't need to enable cb for XDP */ 1515 napi_complete_done(napi, 0); 1516 return 0; 1517 } 1518 1519 txq = netdev_get_tx_queue(vi->dev, index); 1520 __netif_tx_lock(txq, raw_smp_processor_id()); 1521 free_old_xmit_skbs(sq, true); 1522 __netif_tx_unlock(txq); 1523 1524 virtqueue_napi_complete(napi, sq->vq, 0); 1525 1526 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1527 netif_tx_wake_queue(txq); 1528 1529 return 0; 1530 } 1531 1532 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1533 { 1534 struct virtio_net_hdr_mrg_rxbuf *hdr; 1535 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1536 struct virtnet_info *vi = sq->vq->vdev->priv; 1537 int num_sg; 1538 unsigned hdr_len = vi->hdr_len; 1539 bool can_push; 1540 1541 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1542 1543 can_push = vi->any_header_sg && 1544 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1545 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1546 /* Even if we can, don't push here yet as this would skew 1547 * csum_start offset below. */ 1548 if (can_push) 1549 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 1550 else 1551 hdr = skb_vnet_hdr(skb); 1552 1553 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 1554 virtio_is_little_endian(vi->vdev), false, 1555 0)) 1556 BUG(); 1557 1558 if (vi->mergeable_rx_bufs) 1559 hdr->num_buffers = 0; 1560 1561 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 1562 if (can_push) { 1563 __skb_push(skb, hdr_len); 1564 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 1565 if (unlikely(num_sg < 0)) 1566 return num_sg; 1567 /* Pull header back to avoid skew in tx bytes calculations. */ 1568 __skb_pull(skb, hdr_len); 1569 } else { 1570 sg_set_buf(sq->sg, hdr, hdr_len); 1571 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 1572 if (unlikely(num_sg < 0)) 1573 return num_sg; 1574 num_sg++; 1575 } 1576 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 1577 } 1578 1579 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 1580 { 1581 struct virtnet_info *vi = netdev_priv(dev); 1582 int qnum = skb_get_queue_mapping(skb); 1583 struct send_queue *sq = &vi->sq[qnum]; 1584 int err; 1585 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 1586 bool kick = !netdev_xmit_more(); 1587 bool use_napi = sq->napi.weight; 1588 1589 /* Free up any pending old buffers before queueing new ones. */ 1590 free_old_xmit_skbs(sq, false); 1591 1592 if (use_napi && kick) 1593 virtqueue_enable_cb_delayed(sq->vq); 1594 1595 /* timestamp packet in software */ 1596 skb_tx_timestamp(skb); 1597 1598 /* Try to transmit */ 1599 err = xmit_skb(sq, skb); 1600 1601 /* This should not happen! */ 1602 if (unlikely(err)) { 1603 dev->stats.tx_fifo_errors++; 1604 if (net_ratelimit()) 1605 dev_warn(&dev->dev, 1606 "Unexpected TXQ (%d) queue failure: %d\n", 1607 qnum, err); 1608 dev->stats.tx_dropped++; 1609 dev_kfree_skb_any(skb); 1610 return NETDEV_TX_OK; 1611 } 1612 1613 /* Don't wait up for transmitted skbs to be freed. */ 1614 if (!use_napi) { 1615 skb_orphan(skb); 1616 nf_reset_ct(skb); 1617 } 1618 1619 /* If running out of space, stop queue to avoid getting packets that we 1620 * are then unable to transmit. 1621 * An alternative would be to force queuing layer to requeue the skb by 1622 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 1623 * returned in a normal path of operation: it means that driver is not 1624 * maintaining the TX queue stop/start state properly, and causes 1625 * the stack to do a non-trivial amount of useless work. 1626 * Since most packets only take 1 or 2 ring slots, stopping the queue 1627 * early means 16 slots are typically wasted. 1628 */ 1629 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 1630 netif_stop_subqueue(dev, qnum); 1631 if (!use_napi && 1632 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 1633 /* More just got used, free them then recheck. */ 1634 free_old_xmit_skbs(sq, false); 1635 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 1636 netif_start_subqueue(dev, qnum); 1637 virtqueue_disable_cb(sq->vq); 1638 } 1639 } 1640 } 1641 1642 if (kick || netif_xmit_stopped(txq)) { 1643 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1644 u64_stats_update_begin(&sq->stats.syncp); 1645 sq->stats.kicks++; 1646 u64_stats_update_end(&sq->stats.syncp); 1647 } 1648 } 1649 1650 return NETDEV_TX_OK; 1651 } 1652 1653 /* 1654 * Send command via the control virtqueue and check status. Commands 1655 * supported by the hypervisor, as indicated by feature bits, should 1656 * never fail unless improperly formatted. 1657 */ 1658 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 1659 struct scatterlist *out) 1660 { 1661 struct scatterlist *sgs[4], hdr, stat; 1662 unsigned out_num = 0, tmp; 1663 1664 /* Caller should know better */ 1665 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 1666 1667 vi->ctrl->status = ~0; 1668 vi->ctrl->hdr.class = class; 1669 vi->ctrl->hdr.cmd = cmd; 1670 /* Add header */ 1671 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 1672 sgs[out_num++] = &hdr; 1673 1674 if (out) 1675 sgs[out_num++] = out; 1676 1677 /* Add return status. */ 1678 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 1679 sgs[out_num] = &stat; 1680 1681 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 1682 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 1683 1684 if (unlikely(!virtqueue_kick(vi->cvq))) 1685 return vi->ctrl->status == VIRTIO_NET_OK; 1686 1687 /* Spin for a response, the kick causes an ioport write, trapping 1688 * into the hypervisor, so the request should be handled immediately. 1689 */ 1690 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1691 !virtqueue_is_broken(vi->cvq)) 1692 cpu_relax(); 1693 1694 return vi->ctrl->status == VIRTIO_NET_OK; 1695 } 1696 1697 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1698 { 1699 struct virtnet_info *vi = netdev_priv(dev); 1700 struct virtio_device *vdev = vi->vdev; 1701 int ret; 1702 struct sockaddr *addr; 1703 struct scatterlist sg; 1704 1705 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 1706 return -EOPNOTSUPP; 1707 1708 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 1709 if (!addr) 1710 return -ENOMEM; 1711 1712 ret = eth_prepare_mac_addr_change(dev, addr); 1713 if (ret) 1714 goto out; 1715 1716 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1717 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1718 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1719 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1720 dev_warn(&vdev->dev, 1721 "Failed to set mac address by vq command.\n"); 1722 ret = -EINVAL; 1723 goto out; 1724 } 1725 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1726 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1727 unsigned int i; 1728 1729 /* Naturally, this has an atomicity problem. */ 1730 for (i = 0; i < dev->addr_len; i++) 1731 virtio_cwrite8(vdev, 1732 offsetof(struct virtio_net_config, mac) + 1733 i, addr->sa_data[i]); 1734 } 1735 1736 eth_commit_mac_addr_change(dev, p); 1737 ret = 0; 1738 1739 out: 1740 kfree(addr); 1741 return ret; 1742 } 1743 1744 static void virtnet_stats(struct net_device *dev, 1745 struct rtnl_link_stats64 *tot) 1746 { 1747 struct virtnet_info *vi = netdev_priv(dev); 1748 unsigned int start; 1749 int i; 1750 1751 for (i = 0; i < vi->max_queue_pairs; i++) { 1752 u64 tpackets, tbytes, rpackets, rbytes, rdrops; 1753 struct receive_queue *rq = &vi->rq[i]; 1754 struct send_queue *sq = &vi->sq[i]; 1755 1756 do { 1757 start = u64_stats_fetch_begin_irq(&sq->stats.syncp); 1758 tpackets = sq->stats.packets; 1759 tbytes = sq->stats.bytes; 1760 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); 1761 1762 do { 1763 start = u64_stats_fetch_begin_irq(&rq->stats.syncp); 1764 rpackets = rq->stats.packets; 1765 rbytes = rq->stats.bytes; 1766 rdrops = rq->stats.drops; 1767 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); 1768 1769 tot->rx_packets += rpackets; 1770 tot->tx_packets += tpackets; 1771 tot->rx_bytes += rbytes; 1772 tot->tx_bytes += tbytes; 1773 tot->rx_dropped += rdrops; 1774 } 1775 1776 tot->tx_dropped = dev->stats.tx_dropped; 1777 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1778 tot->rx_length_errors = dev->stats.rx_length_errors; 1779 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1780 } 1781 1782 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1783 { 1784 rtnl_lock(); 1785 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1786 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1787 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1788 rtnl_unlock(); 1789 } 1790 1791 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1792 { 1793 struct scatterlist sg; 1794 struct net_device *dev = vi->dev; 1795 1796 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1797 return 0; 1798 1799 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1800 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 1801 1802 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1803 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1804 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1805 queue_pairs); 1806 return -EINVAL; 1807 } else { 1808 vi->curr_queue_pairs = queue_pairs; 1809 /* virtnet_open() will refill when device is going to up. */ 1810 if (dev->flags & IFF_UP) 1811 schedule_delayed_work(&vi->refill, 0); 1812 } 1813 1814 return 0; 1815 } 1816 1817 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1818 { 1819 int err; 1820 1821 rtnl_lock(); 1822 err = _virtnet_set_queues(vi, queue_pairs); 1823 rtnl_unlock(); 1824 return err; 1825 } 1826 1827 static int virtnet_close(struct net_device *dev) 1828 { 1829 struct virtnet_info *vi = netdev_priv(dev); 1830 int i; 1831 1832 /* Make sure refill_work doesn't re-enable napi! */ 1833 cancel_delayed_work_sync(&vi->refill); 1834 1835 for (i = 0; i < vi->max_queue_pairs; i++) { 1836 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1837 napi_disable(&vi->rq[i].napi); 1838 virtnet_napi_tx_disable(&vi->sq[i].napi); 1839 } 1840 1841 return 0; 1842 } 1843 1844 static void virtnet_set_rx_mode(struct net_device *dev) 1845 { 1846 struct virtnet_info *vi = netdev_priv(dev); 1847 struct scatterlist sg[2]; 1848 struct virtio_net_ctrl_mac *mac_data; 1849 struct netdev_hw_addr *ha; 1850 int uc_count; 1851 int mc_count; 1852 void *buf; 1853 int i; 1854 1855 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1856 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1857 return; 1858 1859 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 1860 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1861 1862 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 1863 1864 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1865 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1866 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1867 vi->ctrl->promisc ? "en" : "dis"); 1868 1869 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 1870 1871 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1872 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1873 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1874 vi->ctrl->allmulti ? "en" : "dis"); 1875 1876 uc_count = netdev_uc_count(dev); 1877 mc_count = netdev_mc_count(dev); 1878 /* MAC filter - use one buffer for both lists */ 1879 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1880 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1881 mac_data = buf; 1882 if (!buf) 1883 return; 1884 1885 sg_init_table(sg, 2); 1886 1887 /* Store the unicast list and count in the front of the buffer */ 1888 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1889 i = 0; 1890 netdev_for_each_uc_addr(ha, dev) 1891 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1892 1893 sg_set_buf(&sg[0], mac_data, 1894 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1895 1896 /* multicast list and count fill the end */ 1897 mac_data = (void *)&mac_data->macs[uc_count][0]; 1898 1899 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1900 i = 0; 1901 netdev_for_each_mc_addr(ha, dev) 1902 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1903 1904 sg_set_buf(&sg[1], mac_data, 1905 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1906 1907 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1908 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1909 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1910 1911 kfree(buf); 1912 } 1913 1914 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1915 __be16 proto, u16 vid) 1916 { 1917 struct virtnet_info *vi = netdev_priv(dev); 1918 struct scatterlist sg; 1919 1920 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 1921 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 1922 1923 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1924 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1925 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1926 return 0; 1927 } 1928 1929 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1930 __be16 proto, u16 vid) 1931 { 1932 struct virtnet_info *vi = netdev_priv(dev); 1933 struct scatterlist sg; 1934 1935 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 1936 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 1937 1938 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1939 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1940 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1941 return 0; 1942 } 1943 1944 static void virtnet_clean_affinity(struct virtnet_info *vi) 1945 { 1946 int i; 1947 1948 if (vi->affinity_hint_set) { 1949 for (i = 0; i < vi->max_queue_pairs; i++) { 1950 virtqueue_set_affinity(vi->rq[i].vq, NULL); 1951 virtqueue_set_affinity(vi->sq[i].vq, NULL); 1952 } 1953 1954 vi->affinity_hint_set = false; 1955 } 1956 } 1957 1958 static void virtnet_set_affinity(struct virtnet_info *vi) 1959 { 1960 cpumask_var_t mask; 1961 int stragglers; 1962 int group_size; 1963 int i, j, cpu; 1964 int num_cpu; 1965 int stride; 1966 1967 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 1968 virtnet_clean_affinity(vi); 1969 return; 1970 } 1971 1972 num_cpu = num_online_cpus(); 1973 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 1974 stragglers = num_cpu >= vi->curr_queue_pairs ? 1975 num_cpu % vi->curr_queue_pairs : 1976 0; 1977 cpu = cpumask_next(-1, cpu_online_mask); 1978 1979 for (i = 0; i < vi->curr_queue_pairs; i++) { 1980 group_size = stride + (i < stragglers ? 1 : 0); 1981 1982 for (j = 0; j < group_size; j++) { 1983 cpumask_set_cpu(cpu, mask); 1984 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 1985 nr_cpu_ids, false); 1986 } 1987 virtqueue_set_affinity(vi->rq[i].vq, mask); 1988 virtqueue_set_affinity(vi->sq[i].vq, mask); 1989 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false); 1990 cpumask_clear(mask); 1991 } 1992 1993 vi->affinity_hint_set = true; 1994 free_cpumask_var(mask); 1995 } 1996 1997 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 1998 { 1999 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2000 node); 2001 virtnet_set_affinity(vi); 2002 return 0; 2003 } 2004 2005 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 2006 { 2007 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2008 node_dead); 2009 virtnet_set_affinity(vi); 2010 return 0; 2011 } 2012 2013 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 2014 { 2015 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2016 node); 2017 2018 virtnet_clean_affinity(vi); 2019 return 0; 2020 } 2021 2022 static enum cpuhp_state virtionet_online; 2023 2024 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 2025 { 2026 int ret; 2027 2028 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 2029 if (ret) 2030 return ret; 2031 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2032 &vi->node_dead); 2033 if (!ret) 2034 return ret; 2035 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2036 return ret; 2037 } 2038 2039 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 2040 { 2041 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2042 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2043 &vi->node_dead); 2044 } 2045 2046 static void virtnet_get_ringparam(struct net_device *dev, 2047 struct ethtool_ringparam *ring) 2048 { 2049 struct virtnet_info *vi = netdev_priv(dev); 2050 2051 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2052 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2053 ring->rx_pending = ring->rx_max_pending; 2054 ring->tx_pending = ring->tx_max_pending; 2055 } 2056 2057 2058 static void virtnet_get_drvinfo(struct net_device *dev, 2059 struct ethtool_drvinfo *info) 2060 { 2061 struct virtnet_info *vi = netdev_priv(dev); 2062 struct virtio_device *vdev = vi->vdev; 2063 2064 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 2065 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 2066 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 2067 2068 } 2069 2070 /* TODO: Eliminate OOO packets during switching */ 2071 static int virtnet_set_channels(struct net_device *dev, 2072 struct ethtool_channels *channels) 2073 { 2074 struct virtnet_info *vi = netdev_priv(dev); 2075 u16 queue_pairs = channels->combined_count; 2076 int err; 2077 2078 /* We don't support separate rx/tx channels. 2079 * We don't allow setting 'other' channels. 2080 */ 2081 if (channels->rx_count || channels->tx_count || channels->other_count) 2082 return -EINVAL; 2083 2084 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2085 return -EINVAL; 2086 2087 /* For now we don't support modifying channels while XDP is loaded 2088 * also when XDP is loaded all RX queues have XDP programs so we only 2089 * need to check a single RX queue. 2090 */ 2091 if (vi->rq[0].xdp_prog) 2092 return -EINVAL; 2093 2094 get_online_cpus(); 2095 err = _virtnet_set_queues(vi, queue_pairs); 2096 if (!err) { 2097 netif_set_real_num_tx_queues(dev, queue_pairs); 2098 netif_set_real_num_rx_queues(dev, queue_pairs); 2099 2100 virtnet_set_affinity(vi); 2101 } 2102 put_online_cpus(); 2103 2104 return err; 2105 } 2106 2107 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2108 { 2109 struct virtnet_info *vi = netdev_priv(dev); 2110 char *p = (char *)data; 2111 unsigned int i, j; 2112 2113 switch (stringset) { 2114 case ETH_SS_STATS: 2115 for (i = 0; i < vi->curr_queue_pairs; i++) { 2116 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2117 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", 2118 i, virtnet_rq_stats_desc[j].desc); 2119 p += ETH_GSTRING_LEN; 2120 } 2121 } 2122 2123 for (i = 0; i < vi->curr_queue_pairs; i++) { 2124 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2125 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s", 2126 i, virtnet_sq_stats_desc[j].desc); 2127 p += ETH_GSTRING_LEN; 2128 } 2129 } 2130 break; 2131 } 2132 } 2133 2134 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2135 { 2136 struct virtnet_info *vi = netdev_priv(dev); 2137 2138 switch (sset) { 2139 case ETH_SS_STATS: 2140 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2141 VIRTNET_SQ_STATS_LEN); 2142 default: 2143 return -EOPNOTSUPP; 2144 } 2145 } 2146 2147 static void virtnet_get_ethtool_stats(struct net_device *dev, 2148 struct ethtool_stats *stats, u64 *data) 2149 { 2150 struct virtnet_info *vi = netdev_priv(dev); 2151 unsigned int idx = 0, start, i, j; 2152 const u8 *stats_base; 2153 size_t offset; 2154 2155 for (i = 0; i < vi->curr_queue_pairs; i++) { 2156 struct receive_queue *rq = &vi->rq[i]; 2157 2158 stats_base = (u8 *)&rq->stats; 2159 do { 2160 start = u64_stats_fetch_begin_irq(&rq->stats.syncp); 2161 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2162 offset = virtnet_rq_stats_desc[j].offset; 2163 data[idx + j] = *(u64 *)(stats_base + offset); 2164 } 2165 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); 2166 idx += VIRTNET_RQ_STATS_LEN; 2167 } 2168 2169 for (i = 0; i < vi->curr_queue_pairs; i++) { 2170 struct send_queue *sq = &vi->sq[i]; 2171 2172 stats_base = (u8 *)&sq->stats; 2173 do { 2174 start = u64_stats_fetch_begin_irq(&sq->stats.syncp); 2175 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2176 offset = virtnet_sq_stats_desc[j].offset; 2177 data[idx + j] = *(u64 *)(stats_base + offset); 2178 } 2179 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); 2180 idx += VIRTNET_SQ_STATS_LEN; 2181 } 2182 } 2183 2184 static void virtnet_get_channels(struct net_device *dev, 2185 struct ethtool_channels *channels) 2186 { 2187 struct virtnet_info *vi = netdev_priv(dev); 2188 2189 channels->combined_count = vi->curr_queue_pairs; 2190 channels->max_combined = vi->max_queue_pairs; 2191 channels->max_other = 0; 2192 channels->rx_count = 0; 2193 channels->tx_count = 0; 2194 channels->other_count = 0; 2195 } 2196 2197 static int virtnet_set_link_ksettings(struct net_device *dev, 2198 const struct ethtool_link_ksettings *cmd) 2199 { 2200 struct virtnet_info *vi = netdev_priv(dev); 2201 2202 return ethtool_virtdev_set_link_ksettings(dev, cmd, 2203 &vi->speed, &vi->duplex); 2204 } 2205 2206 static int virtnet_get_link_ksettings(struct net_device *dev, 2207 struct ethtool_link_ksettings *cmd) 2208 { 2209 struct virtnet_info *vi = netdev_priv(dev); 2210 2211 cmd->base.speed = vi->speed; 2212 cmd->base.duplex = vi->duplex; 2213 cmd->base.port = PORT_OTHER; 2214 2215 return 0; 2216 } 2217 2218 static int virtnet_set_coalesce(struct net_device *dev, 2219 struct ethtool_coalesce *ec) 2220 { 2221 struct virtnet_info *vi = netdev_priv(dev); 2222 int i, napi_weight; 2223 2224 if (ec->tx_max_coalesced_frames > 1 || 2225 ec->rx_max_coalesced_frames != 1) 2226 return -EINVAL; 2227 2228 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 2229 if (napi_weight ^ vi->sq[0].napi.weight) { 2230 if (dev->flags & IFF_UP) 2231 return -EBUSY; 2232 for (i = 0; i < vi->max_queue_pairs; i++) 2233 vi->sq[i].napi.weight = napi_weight; 2234 } 2235 2236 return 0; 2237 } 2238 2239 static int virtnet_get_coalesce(struct net_device *dev, 2240 struct ethtool_coalesce *ec) 2241 { 2242 struct ethtool_coalesce ec_default = { 2243 .cmd = ETHTOOL_GCOALESCE, 2244 .rx_max_coalesced_frames = 1, 2245 }; 2246 struct virtnet_info *vi = netdev_priv(dev); 2247 2248 memcpy(ec, &ec_default, sizeof(ec_default)); 2249 2250 if (vi->sq[0].napi.weight) 2251 ec->tx_max_coalesced_frames = 1; 2252 2253 return 0; 2254 } 2255 2256 static void virtnet_init_settings(struct net_device *dev) 2257 { 2258 struct virtnet_info *vi = netdev_priv(dev); 2259 2260 vi->speed = SPEED_UNKNOWN; 2261 vi->duplex = DUPLEX_UNKNOWN; 2262 } 2263 2264 static void virtnet_update_settings(struct virtnet_info *vi) 2265 { 2266 u32 speed; 2267 u8 duplex; 2268 2269 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 2270 return; 2271 2272 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); 2273 2274 if (ethtool_validate_speed(speed)) 2275 vi->speed = speed; 2276 2277 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); 2278 2279 if (ethtool_validate_duplex(duplex)) 2280 vi->duplex = duplex; 2281 } 2282 2283 static const struct ethtool_ops virtnet_ethtool_ops = { 2284 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES, 2285 .get_drvinfo = virtnet_get_drvinfo, 2286 .get_link = ethtool_op_get_link, 2287 .get_ringparam = virtnet_get_ringparam, 2288 .get_strings = virtnet_get_strings, 2289 .get_sset_count = virtnet_get_sset_count, 2290 .get_ethtool_stats = virtnet_get_ethtool_stats, 2291 .set_channels = virtnet_set_channels, 2292 .get_channels = virtnet_get_channels, 2293 .get_ts_info = ethtool_op_get_ts_info, 2294 .get_link_ksettings = virtnet_get_link_ksettings, 2295 .set_link_ksettings = virtnet_set_link_ksettings, 2296 .set_coalesce = virtnet_set_coalesce, 2297 .get_coalesce = virtnet_get_coalesce, 2298 }; 2299 2300 static void virtnet_freeze_down(struct virtio_device *vdev) 2301 { 2302 struct virtnet_info *vi = vdev->priv; 2303 int i; 2304 2305 /* Make sure no work handler is accessing the device */ 2306 flush_work(&vi->config_work); 2307 2308 netif_tx_lock_bh(vi->dev); 2309 netif_device_detach(vi->dev); 2310 netif_tx_unlock_bh(vi->dev); 2311 cancel_delayed_work_sync(&vi->refill); 2312 2313 if (netif_running(vi->dev)) { 2314 for (i = 0; i < vi->max_queue_pairs; i++) { 2315 napi_disable(&vi->rq[i].napi); 2316 virtnet_napi_tx_disable(&vi->sq[i].napi); 2317 } 2318 } 2319 } 2320 2321 static int init_vqs(struct virtnet_info *vi); 2322 2323 static int virtnet_restore_up(struct virtio_device *vdev) 2324 { 2325 struct virtnet_info *vi = vdev->priv; 2326 int err, i; 2327 2328 err = init_vqs(vi); 2329 if (err) 2330 return err; 2331 2332 virtio_device_ready(vdev); 2333 2334 if (netif_running(vi->dev)) { 2335 for (i = 0; i < vi->curr_queue_pairs; i++) 2336 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 2337 schedule_delayed_work(&vi->refill, 0); 2338 2339 for (i = 0; i < vi->max_queue_pairs; i++) { 2340 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2341 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 2342 &vi->sq[i].napi); 2343 } 2344 } 2345 2346 netif_tx_lock_bh(vi->dev); 2347 netif_device_attach(vi->dev); 2348 netif_tx_unlock_bh(vi->dev); 2349 return err; 2350 } 2351 2352 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 2353 { 2354 struct scatterlist sg; 2355 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 2356 2357 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 2358 2359 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 2360 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 2361 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); 2362 return -EINVAL; 2363 } 2364 2365 return 0; 2366 } 2367 2368 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 2369 { 2370 u64 offloads = 0; 2371 2372 if (!vi->guest_offloads) 2373 return 0; 2374 2375 return virtnet_set_guest_offloads(vi, offloads); 2376 } 2377 2378 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 2379 { 2380 u64 offloads = vi->guest_offloads; 2381 2382 if (!vi->guest_offloads) 2383 return 0; 2384 2385 return virtnet_set_guest_offloads(vi, offloads); 2386 } 2387 2388 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 2389 struct netlink_ext_ack *extack) 2390 { 2391 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); 2392 struct virtnet_info *vi = netdev_priv(dev); 2393 struct bpf_prog *old_prog; 2394 u16 xdp_qp = 0, curr_qp; 2395 int i, err; 2396 2397 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 2398 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 2399 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 2400 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 2401 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 2402 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) { 2403 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first"); 2404 return -EOPNOTSUPP; 2405 } 2406 2407 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 2408 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 2409 return -EINVAL; 2410 } 2411 2412 if (dev->mtu > max_sz) { 2413 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); 2414 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); 2415 return -EINVAL; 2416 } 2417 2418 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 2419 if (prog) 2420 xdp_qp = nr_cpu_ids; 2421 2422 /* XDP requires extra queues for XDP_TX */ 2423 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 2424 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); 2425 netdev_warn(dev, "request %i queues but max is %i\n", 2426 curr_qp + xdp_qp, vi->max_queue_pairs); 2427 return -ENOMEM; 2428 } 2429 2430 old_prog = rtnl_dereference(vi->rq[0].xdp_prog); 2431 if (!prog && !old_prog) 2432 return 0; 2433 2434 if (prog) 2435 bpf_prog_add(prog, vi->max_queue_pairs - 1); 2436 2437 /* Make sure NAPI is not using any XDP TX queues for RX. */ 2438 if (netif_running(dev)) { 2439 for (i = 0; i < vi->max_queue_pairs; i++) { 2440 napi_disable(&vi->rq[i].napi); 2441 virtnet_napi_tx_disable(&vi->sq[i].napi); 2442 } 2443 } 2444 2445 if (!prog) { 2446 for (i = 0; i < vi->max_queue_pairs; i++) { 2447 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 2448 if (i == 0) 2449 virtnet_restore_guest_offloads(vi); 2450 } 2451 synchronize_net(); 2452 } 2453 2454 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 2455 if (err) 2456 goto err; 2457 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 2458 vi->xdp_queue_pairs = xdp_qp; 2459 2460 if (prog) { 2461 for (i = 0; i < vi->max_queue_pairs; i++) { 2462 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 2463 if (i == 0 && !old_prog) 2464 virtnet_clear_guest_offloads(vi); 2465 } 2466 } 2467 2468 for (i = 0; i < vi->max_queue_pairs; i++) { 2469 if (old_prog) 2470 bpf_prog_put(old_prog); 2471 if (netif_running(dev)) { 2472 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2473 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 2474 &vi->sq[i].napi); 2475 } 2476 } 2477 2478 return 0; 2479 2480 err: 2481 if (!prog) { 2482 virtnet_clear_guest_offloads(vi); 2483 for (i = 0; i < vi->max_queue_pairs; i++) 2484 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); 2485 } 2486 2487 if (netif_running(dev)) { 2488 for (i = 0; i < vi->max_queue_pairs; i++) { 2489 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2490 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 2491 &vi->sq[i].napi); 2492 } 2493 } 2494 if (prog) 2495 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 2496 return err; 2497 } 2498 2499 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 2500 { 2501 switch (xdp->command) { 2502 case XDP_SETUP_PROG: 2503 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 2504 default: 2505 return -EINVAL; 2506 } 2507 } 2508 2509 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 2510 size_t len) 2511 { 2512 struct virtnet_info *vi = netdev_priv(dev); 2513 int ret; 2514 2515 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2516 return -EOPNOTSUPP; 2517 2518 ret = snprintf(buf, len, "sby"); 2519 if (ret >= len) 2520 return -EOPNOTSUPP; 2521 2522 return 0; 2523 } 2524 2525 static int virtnet_set_features(struct net_device *dev, 2526 netdev_features_t features) 2527 { 2528 struct virtnet_info *vi = netdev_priv(dev); 2529 u64 offloads; 2530 int err; 2531 2532 if ((dev->features ^ features) & NETIF_F_LRO) { 2533 if (vi->xdp_queue_pairs) 2534 return -EBUSY; 2535 2536 if (features & NETIF_F_LRO) 2537 offloads = vi->guest_offloads_capable; 2538 else 2539 offloads = vi->guest_offloads_capable & 2540 ~GUEST_OFFLOAD_LRO_MASK; 2541 2542 err = virtnet_set_guest_offloads(vi, offloads); 2543 if (err) 2544 return err; 2545 vi->guest_offloads = offloads; 2546 } 2547 2548 return 0; 2549 } 2550 2551 static const struct net_device_ops virtnet_netdev = { 2552 .ndo_open = virtnet_open, 2553 .ndo_stop = virtnet_close, 2554 .ndo_start_xmit = start_xmit, 2555 .ndo_validate_addr = eth_validate_addr, 2556 .ndo_set_mac_address = virtnet_set_mac_address, 2557 .ndo_set_rx_mode = virtnet_set_rx_mode, 2558 .ndo_get_stats64 = virtnet_stats, 2559 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 2560 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 2561 .ndo_bpf = virtnet_xdp, 2562 .ndo_xdp_xmit = virtnet_xdp_xmit, 2563 .ndo_features_check = passthru_features_check, 2564 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 2565 .ndo_set_features = virtnet_set_features, 2566 }; 2567 2568 static void virtnet_config_changed_work(struct work_struct *work) 2569 { 2570 struct virtnet_info *vi = 2571 container_of(work, struct virtnet_info, config_work); 2572 u16 v; 2573 2574 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 2575 struct virtio_net_config, status, &v) < 0) 2576 return; 2577 2578 if (v & VIRTIO_NET_S_ANNOUNCE) { 2579 netdev_notify_peers(vi->dev); 2580 virtnet_ack_link_announce(vi); 2581 } 2582 2583 /* Ignore unknown (future) status bits */ 2584 v &= VIRTIO_NET_S_LINK_UP; 2585 2586 if (vi->status == v) 2587 return; 2588 2589 vi->status = v; 2590 2591 if (vi->status & VIRTIO_NET_S_LINK_UP) { 2592 virtnet_update_settings(vi); 2593 netif_carrier_on(vi->dev); 2594 netif_tx_wake_all_queues(vi->dev); 2595 } else { 2596 netif_carrier_off(vi->dev); 2597 netif_tx_stop_all_queues(vi->dev); 2598 } 2599 } 2600 2601 static void virtnet_config_changed(struct virtio_device *vdev) 2602 { 2603 struct virtnet_info *vi = vdev->priv; 2604 2605 schedule_work(&vi->config_work); 2606 } 2607 2608 static void virtnet_free_queues(struct virtnet_info *vi) 2609 { 2610 int i; 2611 2612 for (i = 0; i < vi->max_queue_pairs; i++) { 2613 __netif_napi_del(&vi->rq[i].napi); 2614 __netif_napi_del(&vi->sq[i].napi); 2615 } 2616 2617 /* We called __netif_napi_del(), 2618 * we need to respect an RCU grace period before freeing vi->rq 2619 */ 2620 synchronize_net(); 2621 2622 kfree(vi->rq); 2623 kfree(vi->sq); 2624 kfree(vi->ctrl); 2625 } 2626 2627 static void _free_receive_bufs(struct virtnet_info *vi) 2628 { 2629 struct bpf_prog *old_prog; 2630 int i; 2631 2632 for (i = 0; i < vi->max_queue_pairs; i++) { 2633 while (vi->rq[i].pages) 2634 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 2635 2636 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2637 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 2638 if (old_prog) 2639 bpf_prog_put(old_prog); 2640 } 2641 } 2642 2643 static void free_receive_bufs(struct virtnet_info *vi) 2644 { 2645 rtnl_lock(); 2646 _free_receive_bufs(vi); 2647 rtnl_unlock(); 2648 } 2649 2650 static void free_receive_page_frags(struct virtnet_info *vi) 2651 { 2652 int i; 2653 for (i = 0; i < vi->max_queue_pairs; i++) 2654 if (vi->rq[i].alloc_frag.page) 2655 put_page(vi->rq[i].alloc_frag.page); 2656 } 2657 2658 static void free_unused_bufs(struct virtnet_info *vi) 2659 { 2660 void *buf; 2661 int i; 2662 2663 for (i = 0; i < vi->max_queue_pairs; i++) { 2664 struct virtqueue *vq = vi->sq[i].vq; 2665 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 2666 if (!is_xdp_frame(buf)) 2667 dev_kfree_skb(buf); 2668 else 2669 xdp_return_frame(ptr_to_xdp(buf)); 2670 } 2671 } 2672 2673 for (i = 0; i < vi->max_queue_pairs; i++) { 2674 struct virtqueue *vq = vi->rq[i].vq; 2675 2676 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 2677 if (vi->mergeable_rx_bufs) { 2678 put_page(virt_to_head_page(buf)); 2679 } else if (vi->big_packets) { 2680 give_pages(&vi->rq[i], buf); 2681 } else { 2682 put_page(virt_to_head_page(buf)); 2683 } 2684 } 2685 } 2686 } 2687 2688 static void virtnet_del_vqs(struct virtnet_info *vi) 2689 { 2690 struct virtio_device *vdev = vi->vdev; 2691 2692 virtnet_clean_affinity(vi); 2693 2694 vdev->config->del_vqs(vdev); 2695 2696 virtnet_free_queues(vi); 2697 } 2698 2699 /* How large should a single buffer be so a queue full of these can fit at 2700 * least one full packet? 2701 * Logic below assumes the mergeable buffer header is used. 2702 */ 2703 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 2704 { 2705 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2706 unsigned int rq_size = virtqueue_get_vring_size(vq); 2707 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 2708 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 2709 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 2710 2711 return max(max(min_buf_len, hdr_len) - hdr_len, 2712 (unsigned int)GOOD_PACKET_LEN); 2713 } 2714 2715 static int virtnet_find_vqs(struct virtnet_info *vi) 2716 { 2717 vq_callback_t **callbacks; 2718 struct virtqueue **vqs; 2719 int ret = -ENOMEM; 2720 int i, total_vqs; 2721 const char **names; 2722 bool *ctx; 2723 2724 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 2725 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 2726 * possible control vq. 2727 */ 2728 total_vqs = vi->max_queue_pairs * 2 + 2729 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 2730 2731 /* Allocate space for find_vqs parameters */ 2732 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 2733 if (!vqs) 2734 goto err_vq; 2735 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 2736 if (!callbacks) 2737 goto err_callback; 2738 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 2739 if (!names) 2740 goto err_names; 2741 if (!vi->big_packets || vi->mergeable_rx_bufs) { 2742 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 2743 if (!ctx) 2744 goto err_ctx; 2745 } else { 2746 ctx = NULL; 2747 } 2748 2749 /* Parameters for control virtqueue, if any */ 2750 if (vi->has_cvq) { 2751 callbacks[total_vqs - 1] = NULL; 2752 names[total_vqs - 1] = "control"; 2753 } 2754 2755 /* Allocate/initialize parameters for send/receive virtqueues */ 2756 for (i = 0; i < vi->max_queue_pairs; i++) { 2757 callbacks[rxq2vq(i)] = skb_recv_done; 2758 callbacks[txq2vq(i)] = skb_xmit_done; 2759 sprintf(vi->rq[i].name, "input.%d", i); 2760 sprintf(vi->sq[i].name, "output.%d", i); 2761 names[rxq2vq(i)] = vi->rq[i].name; 2762 names[txq2vq(i)] = vi->sq[i].name; 2763 if (ctx) 2764 ctx[rxq2vq(i)] = true; 2765 } 2766 2767 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 2768 names, ctx, NULL); 2769 if (ret) 2770 goto err_find; 2771 2772 if (vi->has_cvq) { 2773 vi->cvq = vqs[total_vqs - 1]; 2774 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 2775 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 2776 } 2777 2778 for (i = 0; i < vi->max_queue_pairs; i++) { 2779 vi->rq[i].vq = vqs[rxq2vq(i)]; 2780 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 2781 vi->sq[i].vq = vqs[txq2vq(i)]; 2782 } 2783 2784 /* run here: ret == 0. */ 2785 2786 2787 err_find: 2788 kfree(ctx); 2789 err_ctx: 2790 kfree(names); 2791 err_names: 2792 kfree(callbacks); 2793 err_callback: 2794 kfree(vqs); 2795 err_vq: 2796 return ret; 2797 } 2798 2799 static int virtnet_alloc_queues(struct virtnet_info *vi) 2800 { 2801 int i; 2802 2803 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 2804 if (!vi->ctrl) 2805 goto err_ctrl; 2806 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 2807 if (!vi->sq) 2808 goto err_sq; 2809 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 2810 if (!vi->rq) 2811 goto err_rq; 2812 2813 INIT_DELAYED_WORK(&vi->refill, refill_work); 2814 for (i = 0; i < vi->max_queue_pairs; i++) { 2815 vi->rq[i].pages = NULL; 2816 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 2817 napi_weight); 2818 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, 2819 napi_tx ? napi_weight : 0); 2820 2821 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 2822 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 2823 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 2824 2825 u64_stats_init(&vi->rq[i].stats.syncp); 2826 u64_stats_init(&vi->sq[i].stats.syncp); 2827 } 2828 2829 return 0; 2830 2831 err_rq: 2832 kfree(vi->sq); 2833 err_sq: 2834 kfree(vi->ctrl); 2835 err_ctrl: 2836 return -ENOMEM; 2837 } 2838 2839 static int init_vqs(struct virtnet_info *vi) 2840 { 2841 int ret; 2842 2843 /* Allocate send & receive queues */ 2844 ret = virtnet_alloc_queues(vi); 2845 if (ret) 2846 goto err; 2847 2848 ret = virtnet_find_vqs(vi); 2849 if (ret) 2850 goto err_free; 2851 2852 get_online_cpus(); 2853 virtnet_set_affinity(vi); 2854 put_online_cpus(); 2855 2856 return 0; 2857 2858 err_free: 2859 virtnet_free_queues(vi); 2860 err: 2861 return ret; 2862 } 2863 2864 #ifdef CONFIG_SYSFS 2865 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 2866 char *buf) 2867 { 2868 struct virtnet_info *vi = netdev_priv(queue->dev); 2869 unsigned int queue_index = get_netdev_rx_queue_index(queue); 2870 unsigned int headroom = virtnet_get_headroom(vi); 2871 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 2872 struct ewma_pkt_len *avg; 2873 2874 BUG_ON(queue_index >= vi->max_queue_pairs); 2875 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 2876 return sprintf(buf, "%u\n", 2877 get_mergeable_buf_len(&vi->rq[queue_index], avg, 2878 SKB_DATA_ALIGN(headroom + tailroom))); 2879 } 2880 2881 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 2882 __ATTR_RO(mergeable_rx_buffer_size); 2883 2884 static struct attribute *virtio_net_mrg_rx_attrs[] = { 2885 &mergeable_rx_buffer_size_attribute.attr, 2886 NULL 2887 }; 2888 2889 static const struct attribute_group virtio_net_mrg_rx_group = { 2890 .name = "virtio_net", 2891 .attrs = virtio_net_mrg_rx_attrs 2892 }; 2893 #endif 2894 2895 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 2896 unsigned int fbit, 2897 const char *fname, const char *dname) 2898 { 2899 if (!virtio_has_feature(vdev, fbit)) 2900 return false; 2901 2902 dev_err(&vdev->dev, "device advertises feature %s but not %s", 2903 fname, dname); 2904 2905 return true; 2906 } 2907 2908 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 2909 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 2910 2911 static bool virtnet_validate_features(struct virtio_device *vdev) 2912 { 2913 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 2914 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 2915 "VIRTIO_NET_F_CTRL_VQ") || 2916 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 2917 "VIRTIO_NET_F_CTRL_VQ") || 2918 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 2919 "VIRTIO_NET_F_CTRL_VQ") || 2920 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 2921 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 2922 "VIRTIO_NET_F_CTRL_VQ"))) { 2923 return false; 2924 } 2925 2926 return true; 2927 } 2928 2929 #define MIN_MTU ETH_MIN_MTU 2930 #define MAX_MTU ETH_MAX_MTU 2931 2932 static int virtnet_validate(struct virtio_device *vdev) 2933 { 2934 if (!vdev->config->get) { 2935 dev_err(&vdev->dev, "%s failure: config access disabled\n", 2936 __func__); 2937 return -EINVAL; 2938 } 2939 2940 if (!virtnet_validate_features(vdev)) 2941 return -EINVAL; 2942 2943 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 2944 int mtu = virtio_cread16(vdev, 2945 offsetof(struct virtio_net_config, 2946 mtu)); 2947 if (mtu < MIN_MTU) 2948 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 2949 } 2950 2951 return 0; 2952 } 2953 2954 static int virtnet_probe(struct virtio_device *vdev) 2955 { 2956 int i, err = -ENOMEM; 2957 struct net_device *dev; 2958 struct virtnet_info *vi; 2959 u16 max_queue_pairs; 2960 int mtu; 2961 2962 /* Find if host supports multiqueue virtio_net device */ 2963 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 2964 struct virtio_net_config, 2965 max_virtqueue_pairs, &max_queue_pairs); 2966 2967 /* We need at least 2 queue's */ 2968 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 2969 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 2970 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 2971 max_queue_pairs = 1; 2972 2973 /* Allocate ourselves a network device with room for our info */ 2974 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 2975 if (!dev) 2976 return -ENOMEM; 2977 2978 /* Set up network device as normal. */ 2979 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 2980 dev->netdev_ops = &virtnet_netdev; 2981 dev->features = NETIF_F_HIGHDMA; 2982 2983 dev->ethtool_ops = &virtnet_ethtool_ops; 2984 SET_NETDEV_DEV(dev, &vdev->dev); 2985 2986 /* Do we support "hardware" checksums? */ 2987 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 2988 /* This opens up the world of extra features. */ 2989 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 2990 if (csum) 2991 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 2992 2993 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 2994 dev->hw_features |= NETIF_F_TSO 2995 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 2996 } 2997 /* Individual feature bits: what can host handle? */ 2998 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 2999 dev->hw_features |= NETIF_F_TSO; 3000 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 3001 dev->hw_features |= NETIF_F_TSO6; 3002 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 3003 dev->hw_features |= NETIF_F_TSO_ECN; 3004 3005 dev->features |= NETIF_F_GSO_ROBUST; 3006 3007 if (gso) 3008 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 3009 /* (!csum && gso) case will be fixed by register_netdev() */ 3010 } 3011 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 3012 dev->features |= NETIF_F_RXCSUM; 3013 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3014 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 3015 dev->features |= NETIF_F_LRO; 3016 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 3017 dev->hw_features |= NETIF_F_LRO; 3018 3019 dev->vlan_features = dev->features; 3020 3021 /* MTU range: 68 - 65535 */ 3022 dev->min_mtu = MIN_MTU; 3023 dev->max_mtu = MAX_MTU; 3024 3025 /* Configuration may specify what MAC to use. Otherwise random. */ 3026 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 3027 virtio_cread_bytes(vdev, 3028 offsetof(struct virtio_net_config, mac), 3029 dev->dev_addr, dev->addr_len); 3030 else 3031 eth_hw_addr_random(dev); 3032 3033 /* Set up our device-specific information */ 3034 vi = netdev_priv(dev); 3035 vi->dev = dev; 3036 vi->vdev = vdev; 3037 vdev->priv = vi; 3038 3039 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 3040 3041 /* If we can receive ANY GSO packets, we must allocate large ones. */ 3042 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3043 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 3044 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 3045 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 3046 vi->big_packets = true; 3047 3048 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 3049 vi->mergeable_rx_bufs = true; 3050 3051 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 3052 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 3053 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 3054 else 3055 vi->hdr_len = sizeof(struct virtio_net_hdr); 3056 3057 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 3058 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 3059 vi->any_header_sg = true; 3060 3061 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 3062 vi->has_cvq = true; 3063 3064 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3065 mtu = virtio_cread16(vdev, 3066 offsetof(struct virtio_net_config, 3067 mtu)); 3068 if (mtu < dev->min_mtu) { 3069 /* Should never trigger: MTU was previously validated 3070 * in virtnet_validate. 3071 */ 3072 dev_err(&vdev->dev, 3073 "device MTU appears to have changed it is now %d < %d", 3074 mtu, dev->min_mtu); 3075 goto free; 3076 } 3077 3078 dev->mtu = mtu; 3079 dev->max_mtu = mtu; 3080 3081 /* TODO: size buffers correctly in this case. */ 3082 if (dev->mtu > ETH_DATA_LEN) 3083 vi->big_packets = true; 3084 } 3085 3086 if (vi->any_header_sg) 3087 dev->needed_headroom = vi->hdr_len; 3088 3089 /* Enable multiqueue by default */ 3090 if (num_online_cpus() >= max_queue_pairs) 3091 vi->curr_queue_pairs = max_queue_pairs; 3092 else 3093 vi->curr_queue_pairs = num_online_cpus(); 3094 vi->max_queue_pairs = max_queue_pairs; 3095 3096 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 3097 err = init_vqs(vi); 3098 if (err) 3099 goto free; 3100 3101 #ifdef CONFIG_SYSFS 3102 if (vi->mergeable_rx_bufs) 3103 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 3104 #endif 3105 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 3106 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 3107 3108 virtnet_init_settings(dev); 3109 3110 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 3111 vi->failover = net_failover_create(vi->dev); 3112 if (IS_ERR(vi->failover)) { 3113 err = PTR_ERR(vi->failover); 3114 goto free_vqs; 3115 } 3116 } 3117 3118 err = register_netdev(dev); 3119 if (err) { 3120 pr_debug("virtio_net: registering device failed\n"); 3121 goto free_failover; 3122 } 3123 3124 virtio_device_ready(vdev); 3125 3126 err = virtnet_cpu_notif_add(vi); 3127 if (err) { 3128 pr_debug("virtio_net: registering cpu notifier failed\n"); 3129 goto free_unregister_netdev; 3130 } 3131 3132 virtnet_set_queues(vi, vi->curr_queue_pairs); 3133 3134 /* Assume link up if device can't report link status, 3135 otherwise get link status from config. */ 3136 netif_carrier_off(dev); 3137 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 3138 schedule_work(&vi->config_work); 3139 } else { 3140 vi->status = VIRTIO_NET_S_LINK_UP; 3141 virtnet_update_settings(vi); 3142 netif_carrier_on(dev); 3143 } 3144 3145 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 3146 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 3147 set_bit(guest_offloads[i], &vi->guest_offloads); 3148 vi->guest_offloads_capable = vi->guest_offloads; 3149 3150 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 3151 dev->name, max_queue_pairs); 3152 3153 return 0; 3154 3155 free_unregister_netdev: 3156 vi->vdev->config->reset(vdev); 3157 3158 unregister_netdev(dev); 3159 free_failover: 3160 net_failover_destroy(vi->failover); 3161 free_vqs: 3162 cancel_delayed_work_sync(&vi->refill); 3163 free_receive_page_frags(vi); 3164 virtnet_del_vqs(vi); 3165 free: 3166 free_netdev(dev); 3167 return err; 3168 } 3169 3170 static void remove_vq_common(struct virtnet_info *vi) 3171 { 3172 vi->vdev->config->reset(vi->vdev); 3173 3174 /* Free unused buffers in both send and recv, if any. */ 3175 free_unused_bufs(vi); 3176 3177 free_receive_bufs(vi); 3178 3179 free_receive_page_frags(vi); 3180 3181 virtnet_del_vqs(vi); 3182 } 3183 3184 static void virtnet_remove(struct virtio_device *vdev) 3185 { 3186 struct virtnet_info *vi = vdev->priv; 3187 3188 virtnet_cpu_notif_remove(vi); 3189 3190 /* Make sure no work handler is accessing the device. */ 3191 flush_work(&vi->config_work); 3192 3193 unregister_netdev(vi->dev); 3194 3195 net_failover_destroy(vi->failover); 3196 3197 remove_vq_common(vi); 3198 3199 free_netdev(vi->dev); 3200 } 3201 3202 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 3203 { 3204 struct virtnet_info *vi = vdev->priv; 3205 3206 virtnet_cpu_notif_remove(vi); 3207 virtnet_freeze_down(vdev); 3208 remove_vq_common(vi); 3209 3210 return 0; 3211 } 3212 3213 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 3214 { 3215 struct virtnet_info *vi = vdev->priv; 3216 int err; 3217 3218 err = virtnet_restore_up(vdev); 3219 if (err) 3220 return err; 3221 virtnet_set_queues(vi, vi->curr_queue_pairs); 3222 3223 err = virtnet_cpu_notif_add(vi); 3224 if (err) 3225 return err; 3226 3227 return 0; 3228 } 3229 3230 static struct virtio_device_id id_table[] = { 3231 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 3232 { 0 }, 3233 }; 3234 3235 #define VIRTNET_FEATURES \ 3236 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 3237 VIRTIO_NET_F_MAC, \ 3238 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 3239 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 3240 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 3241 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 3242 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 3243 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 3244 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 3245 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 3246 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY 3247 3248 static unsigned int features[] = { 3249 VIRTNET_FEATURES, 3250 }; 3251 3252 static unsigned int features_legacy[] = { 3253 VIRTNET_FEATURES, 3254 VIRTIO_NET_F_GSO, 3255 VIRTIO_F_ANY_LAYOUT, 3256 }; 3257 3258 static struct virtio_driver virtio_net_driver = { 3259 .feature_table = features, 3260 .feature_table_size = ARRAY_SIZE(features), 3261 .feature_table_legacy = features_legacy, 3262 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 3263 .driver.name = KBUILD_MODNAME, 3264 .driver.owner = THIS_MODULE, 3265 .id_table = id_table, 3266 .validate = virtnet_validate, 3267 .probe = virtnet_probe, 3268 .remove = virtnet_remove, 3269 .config_changed = virtnet_config_changed, 3270 #ifdef CONFIG_PM_SLEEP 3271 .freeze = virtnet_freeze, 3272 .restore = virtnet_restore, 3273 #endif 3274 }; 3275 3276 static __init int virtio_net_driver_init(void) 3277 { 3278 int ret; 3279 3280 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 3281 virtnet_cpu_online, 3282 virtnet_cpu_down_prep); 3283 if (ret < 0) 3284 goto out; 3285 virtionet_online = ret; 3286 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 3287 NULL, virtnet_cpu_dead); 3288 if (ret) 3289 goto err_dead; 3290 3291 ret = register_virtio_driver(&virtio_net_driver); 3292 if (ret) 3293 goto err_virtio; 3294 return 0; 3295 err_virtio: 3296 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 3297 err_dead: 3298 cpuhp_remove_multi_state(virtionet_online); 3299 out: 3300 return ret; 3301 } 3302 module_init(virtio_net_driver_init); 3303 3304 static __exit void virtio_net_driver_exit(void) 3305 { 3306 unregister_virtio_driver(&virtio_net_driver); 3307 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 3308 cpuhp_remove_multi_state(virtionet_online); 3309 } 3310 module_exit(virtio_net_driver_exit); 3311 3312 MODULE_DEVICE_TABLE(virtio, id_table); 3313 MODULE_DESCRIPTION("Virtio network driver"); 3314 MODULE_LICENSE("GPL"); 3315