1 /* A network driver using virtio. 2 * 3 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, see <http://www.gnu.org/licenses/>. 17 */ 18 //#define DEBUG 19 #include <linux/netdevice.h> 20 #include <linux/etherdevice.h> 21 #include <linux/ethtool.h> 22 #include <linux/module.h> 23 #include <linux/virtio.h> 24 #include <linux/virtio_net.h> 25 #include <linux/bpf.h> 26 #include <linux/bpf_trace.h> 27 #include <linux/scatterlist.h> 28 #include <linux/if_vlan.h> 29 #include <linux/slab.h> 30 #include <linux/cpu.h> 31 #include <linux/average.h> 32 #include <linux/filter.h> 33 #include <linux/kernel.h> 34 #include <linux/pci.h> 35 #include <net/route.h> 36 #include <net/xdp.h> 37 #include <net/net_failover.h> 38 39 static int napi_weight = NAPI_POLL_WEIGHT; 40 module_param(napi_weight, int, 0444); 41 42 static bool csum = true, gso = true, napi_tx; 43 module_param(csum, bool, 0444); 44 module_param(gso, bool, 0444); 45 module_param(napi_tx, bool, 0644); 46 47 /* FIXME: MTU in config. */ 48 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) 49 #define GOOD_COPY_LEN 128 50 51 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) 52 53 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ 54 #define VIRTIO_XDP_HEADROOM 256 55 56 /* Separating two types of XDP xmit */ 57 #define VIRTIO_XDP_TX BIT(0) 58 #define VIRTIO_XDP_REDIR BIT(1) 59 60 /* RX packet size EWMA. The average packet size is used to determine the packet 61 * buffer size when refilling RX rings. As the entire RX ring may be refilled 62 * at once, the weight is chosen so that the EWMA will be insensitive to short- 63 * term, transient changes in packet size. 64 */ 65 DECLARE_EWMA(pkt_len, 0, 64) 66 67 #define VIRTNET_DRIVER_VERSION "1.0.0" 68 69 static const unsigned long guest_offloads[] = { 70 VIRTIO_NET_F_GUEST_TSO4, 71 VIRTIO_NET_F_GUEST_TSO6, 72 VIRTIO_NET_F_GUEST_ECN, 73 VIRTIO_NET_F_GUEST_UFO 74 }; 75 76 struct virtnet_stat_desc { 77 char desc[ETH_GSTRING_LEN]; 78 size_t offset; 79 }; 80 81 struct virtnet_sq_stats { 82 struct u64_stats_sync syncp; 83 u64 packets; 84 u64 bytes; 85 u64 xdp_tx; 86 u64 xdp_tx_drops; 87 u64 kicks; 88 }; 89 90 struct virtnet_rq_stats { 91 struct u64_stats_sync syncp; 92 u64 packets; 93 u64 bytes; 94 u64 drops; 95 u64 xdp_packets; 96 u64 xdp_tx; 97 u64 xdp_redirects; 98 u64 xdp_drops; 99 u64 kicks; 100 }; 101 102 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) 103 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) 104 105 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { 106 { "packets", VIRTNET_SQ_STAT(packets) }, 107 { "bytes", VIRTNET_SQ_STAT(bytes) }, 108 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, 109 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, 110 { "kicks", VIRTNET_SQ_STAT(kicks) }, 111 }; 112 113 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { 114 { "packets", VIRTNET_RQ_STAT(packets) }, 115 { "bytes", VIRTNET_RQ_STAT(bytes) }, 116 { "drops", VIRTNET_RQ_STAT(drops) }, 117 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, 118 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, 119 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, 120 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, 121 { "kicks", VIRTNET_RQ_STAT(kicks) }, 122 }; 123 124 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) 125 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) 126 127 /* Internal representation of a send virtqueue */ 128 struct send_queue { 129 /* Virtqueue associated with this send _queue */ 130 struct virtqueue *vq; 131 132 /* TX: fragments + linear part + virtio header */ 133 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 134 135 /* Name of the send queue: output.$index */ 136 char name[40]; 137 138 struct virtnet_sq_stats stats; 139 140 struct napi_struct napi; 141 }; 142 143 /* Internal representation of a receive virtqueue */ 144 struct receive_queue { 145 /* Virtqueue associated with this receive_queue */ 146 struct virtqueue *vq; 147 148 struct napi_struct napi; 149 150 struct bpf_prog __rcu *xdp_prog; 151 152 struct virtnet_rq_stats stats; 153 154 /* Chain pages by the private ptr. */ 155 struct page *pages; 156 157 /* Average packet length for mergeable receive buffers. */ 158 struct ewma_pkt_len mrg_avg_pkt_len; 159 160 /* Page frag for packet buffer allocation. */ 161 struct page_frag alloc_frag; 162 163 /* RX: fragments + linear part + virtio header */ 164 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 165 166 /* Min single buffer size for mergeable buffers case. */ 167 unsigned int min_buf_len; 168 169 /* Name of this receive queue: input.$index */ 170 char name[40]; 171 172 struct xdp_rxq_info xdp_rxq; 173 }; 174 175 /* Control VQ buffers: protected by the rtnl lock */ 176 struct control_buf { 177 struct virtio_net_ctrl_hdr hdr; 178 virtio_net_ctrl_ack status; 179 struct virtio_net_ctrl_mq mq; 180 u8 promisc; 181 u8 allmulti; 182 __virtio16 vid; 183 __virtio64 offloads; 184 }; 185 186 struct virtnet_info { 187 struct virtio_device *vdev; 188 struct virtqueue *cvq; 189 struct net_device *dev; 190 struct send_queue *sq; 191 struct receive_queue *rq; 192 unsigned int status; 193 194 /* Max # of queue pairs supported by the device */ 195 u16 max_queue_pairs; 196 197 /* # of queue pairs currently used by the driver */ 198 u16 curr_queue_pairs; 199 200 /* # of XDP queue pairs currently used by the driver */ 201 u16 xdp_queue_pairs; 202 203 /* I like... big packets and I cannot lie! */ 204 bool big_packets; 205 206 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 207 bool mergeable_rx_bufs; 208 209 /* Has control virtqueue */ 210 bool has_cvq; 211 212 /* Host can handle any s/g split between our header and packet data */ 213 bool any_header_sg; 214 215 /* Packet virtio header size */ 216 u8 hdr_len; 217 218 /* Work struct for refilling if we run low on memory. */ 219 struct delayed_work refill; 220 221 /* Work struct for config space updates */ 222 struct work_struct config_work; 223 224 /* Does the affinity hint is set for virtqueues? */ 225 bool affinity_hint_set; 226 227 /* CPU hotplug instances for online & dead */ 228 struct hlist_node node; 229 struct hlist_node node_dead; 230 231 struct control_buf *ctrl; 232 233 /* Ethtool settings */ 234 u8 duplex; 235 u32 speed; 236 237 unsigned long guest_offloads; 238 239 /* failover when STANDBY feature enabled */ 240 struct failover *failover; 241 }; 242 243 struct padded_vnet_hdr { 244 struct virtio_net_hdr_mrg_rxbuf hdr; 245 /* 246 * hdr is in a separate sg buffer, and data sg buffer shares same page 247 * with this header sg. This padding makes next sg 16 byte aligned 248 * after the header. 249 */ 250 char padding[4]; 251 }; 252 253 /* Converting between virtqueue no. and kernel tx/rx queue no. 254 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 255 */ 256 static int vq2txq(struct virtqueue *vq) 257 { 258 return (vq->index - 1) / 2; 259 } 260 261 static int txq2vq(int txq) 262 { 263 return txq * 2 + 1; 264 } 265 266 static int vq2rxq(struct virtqueue *vq) 267 { 268 return vq->index / 2; 269 } 270 271 static int rxq2vq(int rxq) 272 { 273 return rxq * 2; 274 } 275 276 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 277 { 278 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 279 } 280 281 /* 282 * private is used to chain pages for big packets, put the whole 283 * most recent used list in the beginning for reuse 284 */ 285 static void give_pages(struct receive_queue *rq, struct page *page) 286 { 287 struct page *end; 288 289 /* Find end of list, sew whole thing into vi->rq.pages. */ 290 for (end = page; end->private; end = (struct page *)end->private); 291 end->private = (unsigned long)rq->pages; 292 rq->pages = page; 293 } 294 295 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 296 { 297 struct page *p = rq->pages; 298 299 if (p) { 300 rq->pages = (struct page *)p->private; 301 /* clear private here, it is used to chain pages */ 302 p->private = 0; 303 } else 304 p = alloc_page(gfp_mask); 305 return p; 306 } 307 308 static void virtqueue_napi_schedule(struct napi_struct *napi, 309 struct virtqueue *vq) 310 { 311 if (napi_schedule_prep(napi)) { 312 virtqueue_disable_cb(vq); 313 __napi_schedule(napi); 314 } 315 } 316 317 static void virtqueue_napi_complete(struct napi_struct *napi, 318 struct virtqueue *vq, int processed) 319 { 320 int opaque; 321 322 opaque = virtqueue_enable_cb_prepare(vq); 323 if (napi_complete_done(napi, processed)) { 324 if (unlikely(virtqueue_poll(vq, opaque))) 325 virtqueue_napi_schedule(napi, vq); 326 } else { 327 virtqueue_disable_cb(vq); 328 } 329 } 330 331 static void skb_xmit_done(struct virtqueue *vq) 332 { 333 struct virtnet_info *vi = vq->vdev->priv; 334 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; 335 336 /* Suppress further interrupts. */ 337 virtqueue_disable_cb(vq); 338 339 if (napi->weight) 340 virtqueue_napi_schedule(napi, vq); 341 else 342 /* We were probably waiting for more output buffers. */ 343 netif_wake_subqueue(vi->dev, vq2txq(vq)); 344 } 345 346 #define MRG_CTX_HEADER_SHIFT 22 347 static void *mergeable_len_to_ctx(unsigned int truesize, 348 unsigned int headroom) 349 { 350 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); 351 } 352 353 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) 354 { 355 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; 356 } 357 358 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) 359 { 360 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); 361 } 362 363 /* Called from bottom half context */ 364 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 365 struct receive_queue *rq, 366 struct page *page, unsigned int offset, 367 unsigned int len, unsigned int truesize) 368 { 369 struct sk_buff *skb; 370 struct virtio_net_hdr_mrg_rxbuf *hdr; 371 unsigned int copy, hdr_len, hdr_padded_len; 372 char *p; 373 374 p = page_address(page) + offset; 375 376 /* copy small packet so we can reuse these pages for small data */ 377 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 378 if (unlikely(!skb)) 379 return NULL; 380 381 hdr = skb_vnet_hdr(skb); 382 383 hdr_len = vi->hdr_len; 384 if (vi->mergeable_rx_bufs) 385 hdr_padded_len = sizeof(*hdr); 386 else 387 hdr_padded_len = sizeof(struct padded_vnet_hdr); 388 389 memcpy(hdr, p, hdr_len); 390 391 len -= hdr_len; 392 offset += hdr_padded_len; 393 p += hdr_padded_len; 394 395 copy = len; 396 if (copy > skb_tailroom(skb)) 397 copy = skb_tailroom(skb); 398 skb_put_data(skb, p, copy); 399 400 len -= copy; 401 offset += copy; 402 403 if (vi->mergeable_rx_bufs) { 404 if (len) 405 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 406 else 407 put_page(page); 408 return skb; 409 } 410 411 /* 412 * Verify that we can indeed put this data into a skb. 413 * This is here to handle cases when the device erroneously 414 * tries to receive more than is possible. This is usually 415 * the case of a broken device. 416 */ 417 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 418 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 419 dev_kfree_skb(skb); 420 return NULL; 421 } 422 BUG_ON(offset >= PAGE_SIZE); 423 while (len) { 424 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 425 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 426 frag_size, truesize); 427 len -= frag_size; 428 page = (struct page *)page->private; 429 offset = 0; 430 } 431 432 if (page) 433 give_pages(rq, page); 434 435 return skb; 436 } 437 438 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, 439 struct send_queue *sq, 440 struct xdp_frame *xdpf) 441 { 442 struct virtio_net_hdr_mrg_rxbuf *hdr; 443 int err; 444 445 /* virtqueue want to use data area in-front of packet */ 446 if (unlikely(xdpf->metasize > 0)) 447 return -EOPNOTSUPP; 448 449 if (unlikely(xdpf->headroom < vi->hdr_len)) 450 return -EOVERFLOW; 451 452 /* Make room for virtqueue hdr (also change xdpf->headroom?) */ 453 xdpf->data -= vi->hdr_len; 454 /* Zero header and leave csum up to XDP layers */ 455 hdr = xdpf->data; 456 memset(hdr, 0, vi->hdr_len); 457 xdpf->len += vi->hdr_len; 458 459 sg_init_one(sq->sg, xdpf->data, xdpf->len); 460 461 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdpf, GFP_ATOMIC); 462 if (unlikely(err)) 463 return -ENOSPC; /* Caller handle free/refcnt */ 464 465 return 0; 466 } 467 468 static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi) 469 { 470 unsigned int qp; 471 472 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); 473 return &vi->sq[qp]; 474 } 475 476 static int virtnet_xdp_xmit(struct net_device *dev, 477 int n, struct xdp_frame **frames, u32 flags) 478 { 479 struct virtnet_info *vi = netdev_priv(dev); 480 struct receive_queue *rq = vi->rq; 481 struct xdp_frame *xdpf_sent; 482 struct bpf_prog *xdp_prog; 483 struct send_queue *sq; 484 unsigned int len; 485 int drops = 0; 486 int kicks = 0; 487 int ret, err; 488 int i; 489 490 sq = virtnet_xdp_sq(vi); 491 492 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { 493 ret = -EINVAL; 494 drops = n; 495 goto out; 496 } 497 498 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this 499 * indicate XDP resources have been successfully allocated. 500 */ 501 xdp_prog = rcu_dereference(rq->xdp_prog); 502 if (!xdp_prog) { 503 ret = -ENXIO; 504 drops = n; 505 goto out; 506 } 507 508 /* Free up any pending old buffers before queueing new ones. */ 509 while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) 510 xdp_return_frame(xdpf_sent); 511 512 for (i = 0; i < n; i++) { 513 struct xdp_frame *xdpf = frames[i]; 514 515 err = __virtnet_xdp_xmit_one(vi, sq, xdpf); 516 if (err) { 517 xdp_return_frame_rx_napi(xdpf); 518 drops++; 519 } 520 } 521 ret = n - drops; 522 523 if (flags & XDP_XMIT_FLUSH) { 524 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 525 kicks = 1; 526 } 527 out: 528 u64_stats_update_begin(&sq->stats.syncp); 529 sq->stats.xdp_tx += n; 530 sq->stats.xdp_tx_drops += drops; 531 sq->stats.kicks += kicks; 532 u64_stats_update_end(&sq->stats.syncp); 533 534 return ret; 535 } 536 537 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 538 { 539 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; 540 } 541 542 /* We copy the packet for XDP in the following cases: 543 * 544 * 1) Packet is scattered across multiple rx buffers. 545 * 2) Headroom space is insufficient. 546 * 547 * This is inefficient but it's a temporary condition that 548 * we hit right after XDP is enabled and until queue is refilled 549 * with large buffers with sufficient headroom - so it should affect 550 * at most queue size packets. 551 * Afterwards, the conditions to enable 552 * XDP should preclude the underlying device from sending packets 553 * across multiple buffers (num_buf > 1), and we make sure buffers 554 * have enough headroom. 555 */ 556 static struct page *xdp_linearize_page(struct receive_queue *rq, 557 u16 *num_buf, 558 struct page *p, 559 int offset, 560 int page_off, 561 unsigned int *len) 562 { 563 struct page *page = alloc_page(GFP_ATOMIC); 564 565 if (!page) 566 return NULL; 567 568 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 569 page_off += *len; 570 571 while (--*num_buf) { 572 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 573 unsigned int buflen; 574 void *buf; 575 int off; 576 577 buf = virtqueue_get_buf(rq->vq, &buflen); 578 if (unlikely(!buf)) 579 goto err_buf; 580 581 p = virt_to_head_page(buf); 582 off = buf - page_address(p); 583 584 /* guard against a misconfigured or uncooperative backend that 585 * is sending packet larger than the MTU. 586 */ 587 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 588 put_page(p); 589 goto err_buf; 590 } 591 592 memcpy(page_address(page) + page_off, 593 page_address(p) + off, buflen); 594 page_off += buflen; 595 put_page(p); 596 } 597 598 /* Headroom does not contribute to packet length */ 599 *len = page_off - VIRTIO_XDP_HEADROOM; 600 return page; 601 err_buf: 602 __free_pages(page, 0); 603 return NULL; 604 } 605 606 static struct sk_buff *receive_small(struct net_device *dev, 607 struct virtnet_info *vi, 608 struct receive_queue *rq, 609 void *buf, void *ctx, 610 unsigned int len, 611 unsigned int *xdp_xmit, 612 struct virtnet_rq_stats *stats) 613 { 614 struct sk_buff *skb; 615 struct bpf_prog *xdp_prog; 616 unsigned int xdp_headroom = (unsigned long)ctx; 617 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 618 unsigned int headroom = vi->hdr_len + header_offset; 619 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 620 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 621 struct page *page = virt_to_head_page(buf); 622 unsigned int delta = 0; 623 struct page *xdp_page; 624 int err; 625 626 len -= vi->hdr_len; 627 stats->bytes += len; 628 629 rcu_read_lock(); 630 xdp_prog = rcu_dereference(rq->xdp_prog); 631 if (xdp_prog) { 632 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 633 struct xdp_frame *xdpf; 634 struct xdp_buff xdp; 635 void *orig_data; 636 u32 act; 637 638 if (unlikely(hdr->hdr.gso_type)) 639 goto err_xdp; 640 641 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 642 int offset = buf - page_address(page) + header_offset; 643 unsigned int tlen = len + vi->hdr_len; 644 u16 num_buf = 1; 645 646 xdp_headroom = virtnet_get_headroom(vi); 647 header_offset = VIRTNET_RX_PAD + xdp_headroom; 648 headroom = vi->hdr_len + header_offset; 649 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 650 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 651 xdp_page = xdp_linearize_page(rq, &num_buf, page, 652 offset, header_offset, 653 &tlen); 654 if (!xdp_page) 655 goto err_xdp; 656 657 buf = page_address(xdp_page); 658 put_page(page); 659 page = xdp_page; 660 } 661 662 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; 663 xdp.data = xdp.data_hard_start + xdp_headroom; 664 xdp_set_data_meta_invalid(&xdp); 665 xdp.data_end = xdp.data + len; 666 xdp.rxq = &rq->xdp_rxq; 667 orig_data = xdp.data; 668 act = bpf_prog_run_xdp(xdp_prog, &xdp); 669 stats->xdp_packets++; 670 671 switch (act) { 672 case XDP_PASS: 673 /* Recalculate length in case bpf program changed it */ 674 delta = orig_data - xdp.data; 675 len = xdp.data_end - xdp.data; 676 break; 677 case XDP_TX: 678 stats->xdp_tx++; 679 xdpf = convert_to_xdp_frame(&xdp); 680 if (unlikely(!xdpf)) 681 goto err_xdp; 682 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 683 if (unlikely(err < 0)) { 684 trace_xdp_exception(vi->dev, xdp_prog, act); 685 goto err_xdp; 686 } 687 *xdp_xmit |= VIRTIO_XDP_TX; 688 rcu_read_unlock(); 689 goto xdp_xmit; 690 case XDP_REDIRECT: 691 stats->xdp_redirects++; 692 err = xdp_do_redirect(dev, &xdp, xdp_prog); 693 if (err) 694 goto err_xdp; 695 *xdp_xmit |= VIRTIO_XDP_REDIR; 696 rcu_read_unlock(); 697 goto xdp_xmit; 698 default: 699 bpf_warn_invalid_xdp_action(act); 700 /* fall through */ 701 case XDP_ABORTED: 702 trace_xdp_exception(vi->dev, xdp_prog, act); 703 case XDP_DROP: 704 goto err_xdp; 705 } 706 } 707 rcu_read_unlock(); 708 709 skb = build_skb(buf, buflen); 710 if (!skb) { 711 put_page(page); 712 goto err; 713 } 714 skb_reserve(skb, headroom - delta); 715 skb_put(skb, len); 716 if (!delta) { 717 buf += header_offset; 718 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 719 } /* keep zeroed vnet hdr since packet was changed by bpf */ 720 721 err: 722 return skb; 723 724 err_xdp: 725 rcu_read_unlock(); 726 stats->xdp_drops++; 727 stats->drops++; 728 put_page(page); 729 xdp_xmit: 730 return NULL; 731 } 732 733 static struct sk_buff *receive_big(struct net_device *dev, 734 struct virtnet_info *vi, 735 struct receive_queue *rq, 736 void *buf, 737 unsigned int len, 738 struct virtnet_rq_stats *stats) 739 { 740 struct page *page = buf; 741 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); 742 743 stats->bytes += len - vi->hdr_len; 744 if (unlikely(!skb)) 745 goto err; 746 747 return skb; 748 749 err: 750 stats->drops++; 751 give_pages(rq, page); 752 return NULL; 753 } 754 755 static struct sk_buff *receive_mergeable(struct net_device *dev, 756 struct virtnet_info *vi, 757 struct receive_queue *rq, 758 void *buf, 759 void *ctx, 760 unsigned int len, 761 unsigned int *xdp_xmit, 762 struct virtnet_rq_stats *stats) 763 { 764 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 765 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 766 struct page *page = virt_to_head_page(buf); 767 int offset = buf - page_address(page); 768 struct sk_buff *head_skb, *curr_skb; 769 struct bpf_prog *xdp_prog; 770 unsigned int truesize; 771 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 772 int err; 773 774 head_skb = NULL; 775 stats->bytes += len - vi->hdr_len; 776 777 rcu_read_lock(); 778 xdp_prog = rcu_dereference(rq->xdp_prog); 779 if (xdp_prog) { 780 struct xdp_frame *xdpf; 781 struct page *xdp_page; 782 struct xdp_buff xdp; 783 void *data; 784 u32 act; 785 786 /* Transient failure which in theory could occur if 787 * in-flight packets from before XDP was enabled reach 788 * the receive path after XDP is loaded. 789 */ 790 if (unlikely(hdr->hdr.gso_type)) 791 goto err_xdp; 792 793 /* This happens when rx buffer size is underestimated 794 * or headroom is not enough because of the buffer 795 * was refilled before XDP is set. This should only 796 * happen for the first several packets, so we don't 797 * care much about its performance. 798 */ 799 if (unlikely(num_buf > 1 || 800 headroom < virtnet_get_headroom(vi))) { 801 /* linearize data for XDP */ 802 xdp_page = xdp_linearize_page(rq, &num_buf, 803 page, offset, 804 VIRTIO_XDP_HEADROOM, 805 &len); 806 if (!xdp_page) 807 goto err_xdp; 808 offset = VIRTIO_XDP_HEADROOM; 809 } else { 810 xdp_page = page; 811 } 812 813 /* Allow consuming headroom but reserve enough space to push 814 * the descriptor on if we get an XDP_TX return code. 815 */ 816 data = page_address(xdp_page) + offset; 817 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; 818 xdp.data = data + vi->hdr_len; 819 xdp_set_data_meta_invalid(&xdp); 820 xdp.data_end = xdp.data + (len - vi->hdr_len); 821 xdp.rxq = &rq->xdp_rxq; 822 823 act = bpf_prog_run_xdp(xdp_prog, &xdp); 824 stats->xdp_packets++; 825 826 switch (act) { 827 case XDP_PASS: 828 /* recalculate offset to account for any header 829 * adjustments. Note other cases do not build an 830 * skb and avoid using offset 831 */ 832 offset = xdp.data - 833 page_address(xdp_page) - vi->hdr_len; 834 835 /* recalculate len if xdp.data or xdp.data_end were 836 * adjusted 837 */ 838 len = xdp.data_end - xdp.data + vi->hdr_len; 839 /* We can only create skb based on xdp_page. */ 840 if (unlikely(xdp_page != page)) { 841 rcu_read_unlock(); 842 put_page(page); 843 head_skb = page_to_skb(vi, rq, xdp_page, 844 offset, len, PAGE_SIZE); 845 return head_skb; 846 } 847 break; 848 case XDP_TX: 849 stats->xdp_tx++; 850 xdpf = convert_to_xdp_frame(&xdp); 851 if (unlikely(!xdpf)) 852 goto err_xdp; 853 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 854 if (unlikely(err < 0)) { 855 trace_xdp_exception(vi->dev, xdp_prog, act); 856 if (unlikely(xdp_page != page)) 857 put_page(xdp_page); 858 goto err_xdp; 859 } 860 *xdp_xmit |= VIRTIO_XDP_TX; 861 if (unlikely(xdp_page != page)) 862 put_page(page); 863 rcu_read_unlock(); 864 goto xdp_xmit; 865 case XDP_REDIRECT: 866 stats->xdp_redirects++; 867 err = xdp_do_redirect(dev, &xdp, xdp_prog); 868 if (err) { 869 if (unlikely(xdp_page != page)) 870 put_page(xdp_page); 871 goto err_xdp; 872 } 873 *xdp_xmit |= VIRTIO_XDP_REDIR; 874 if (unlikely(xdp_page != page)) 875 put_page(page); 876 rcu_read_unlock(); 877 goto xdp_xmit; 878 default: 879 bpf_warn_invalid_xdp_action(act); 880 /* fall through */ 881 case XDP_ABORTED: 882 trace_xdp_exception(vi->dev, xdp_prog, act); 883 /* fall through */ 884 case XDP_DROP: 885 if (unlikely(xdp_page != page)) 886 __free_pages(xdp_page, 0); 887 goto err_xdp; 888 } 889 } 890 rcu_read_unlock(); 891 892 truesize = mergeable_ctx_to_truesize(ctx); 893 if (unlikely(len > truesize)) { 894 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 895 dev->name, len, (unsigned long)ctx); 896 dev->stats.rx_length_errors++; 897 goto err_skb; 898 } 899 900 head_skb = page_to_skb(vi, rq, page, offset, len, truesize); 901 curr_skb = head_skb; 902 903 if (unlikely(!curr_skb)) 904 goto err_skb; 905 while (--num_buf) { 906 int num_skb_frags; 907 908 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 909 if (unlikely(!buf)) { 910 pr_debug("%s: rx error: %d buffers out of %d missing\n", 911 dev->name, num_buf, 912 virtio16_to_cpu(vi->vdev, 913 hdr->num_buffers)); 914 dev->stats.rx_length_errors++; 915 goto err_buf; 916 } 917 918 stats->bytes += len; 919 page = virt_to_head_page(buf); 920 921 truesize = mergeable_ctx_to_truesize(ctx); 922 if (unlikely(len > truesize)) { 923 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 924 dev->name, len, (unsigned long)ctx); 925 dev->stats.rx_length_errors++; 926 goto err_skb; 927 } 928 929 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 930 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 931 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 932 933 if (unlikely(!nskb)) 934 goto err_skb; 935 if (curr_skb == head_skb) 936 skb_shinfo(curr_skb)->frag_list = nskb; 937 else 938 curr_skb->next = nskb; 939 curr_skb = nskb; 940 head_skb->truesize += nskb->truesize; 941 num_skb_frags = 0; 942 } 943 if (curr_skb != head_skb) { 944 head_skb->data_len += len; 945 head_skb->len += len; 946 head_skb->truesize += truesize; 947 } 948 offset = buf - page_address(page); 949 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 950 put_page(page); 951 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 952 len, truesize); 953 } else { 954 skb_add_rx_frag(curr_skb, num_skb_frags, page, 955 offset, len, truesize); 956 } 957 } 958 959 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 960 return head_skb; 961 962 err_xdp: 963 rcu_read_unlock(); 964 stats->xdp_drops++; 965 err_skb: 966 put_page(page); 967 while (num_buf-- > 1) { 968 buf = virtqueue_get_buf(rq->vq, &len); 969 if (unlikely(!buf)) { 970 pr_debug("%s: rx error: %d buffers missing\n", 971 dev->name, num_buf); 972 dev->stats.rx_length_errors++; 973 break; 974 } 975 stats->bytes += len; 976 page = virt_to_head_page(buf); 977 put_page(page); 978 } 979 err_buf: 980 stats->drops++; 981 dev_kfree_skb(head_skb); 982 xdp_xmit: 983 return NULL; 984 } 985 986 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 987 void *buf, unsigned int len, void **ctx, 988 unsigned int *xdp_xmit, 989 struct virtnet_rq_stats *stats) 990 { 991 struct net_device *dev = vi->dev; 992 struct sk_buff *skb; 993 struct virtio_net_hdr_mrg_rxbuf *hdr; 994 995 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 996 pr_debug("%s: short packet %i\n", dev->name, len); 997 dev->stats.rx_length_errors++; 998 if (vi->mergeable_rx_bufs) { 999 put_page(virt_to_head_page(buf)); 1000 } else if (vi->big_packets) { 1001 give_pages(rq, buf); 1002 } else { 1003 put_page(virt_to_head_page(buf)); 1004 } 1005 return; 1006 } 1007 1008 if (vi->mergeable_rx_bufs) 1009 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1010 stats); 1011 else if (vi->big_packets) 1012 skb = receive_big(dev, vi, rq, buf, len, stats); 1013 else 1014 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1015 1016 if (unlikely(!skb)) 1017 return; 1018 1019 hdr = skb_vnet_hdr(skb); 1020 1021 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1022 skb->ip_summed = CHECKSUM_UNNECESSARY; 1023 1024 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1025 virtio_is_little_endian(vi->vdev))) { 1026 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1027 dev->name, hdr->hdr.gso_type, 1028 hdr->hdr.gso_size); 1029 goto frame_err; 1030 } 1031 1032 skb->protocol = eth_type_trans(skb, dev); 1033 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1034 ntohs(skb->protocol), skb->len, skb->pkt_type); 1035 1036 napi_gro_receive(&rq->napi, skb); 1037 return; 1038 1039 frame_err: 1040 dev->stats.rx_frame_errors++; 1041 dev_kfree_skb(skb); 1042 } 1043 1044 /* Unlike mergeable buffers, all buffers are allocated to the 1045 * same size, except for the headroom. For this reason we do 1046 * not need to use mergeable_len_to_ctx here - it is enough 1047 * to store the headroom as the context ignoring the truesize. 1048 */ 1049 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1050 gfp_t gfp) 1051 { 1052 struct page_frag *alloc_frag = &rq->alloc_frag; 1053 char *buf; 1054 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1055 void *ctx = (void *)(unsigned long)xdp_headroom; 1056 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1057 int err; 1058 1059 len = SKB_DATA_ALIGN(len) + 1060 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1061 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1062 return -ENOMEM; 1063 1064 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1065 get_page(alloc_frag->page); 1066 alloc_frag->offset += len; 1067 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1068 vi->hdr_len + GOOD_PACKET_LEN); 1069 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1070 if (err < 0) 1071 put_page(virt_to_head_page(buf)); 1072 return err; 1073 } 1074 1075 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1076 gfp_t gfp) 1077 { 1078 struct page *first, *list = NULL; 1079 char *p; 1080 int i, err, offset; 1081 1082 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 1083 1084 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 1085 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 1086 first = get_a_page(rq, gfp); 1087 if (!first) { 1088 if (list) 1089 give_pages(rq, list); 1090 return -ENOMEM; 1091 } 1092 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1093 1094 /* chain new page in list head to match sg */ 1095 first->private = (unsigned long)list; 1096 list = first; 1097 } 1098 1099 first = get_a_page(rq, gfp); 1100 if (!first) { 1101 give_pages(rq, list); 1102 return -ENOMEM; 1103 } 1104 p = page_address(first); 1105 1106 /* rq->sg[0], rq->sg[1] share the same page */ 1107 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1108 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1109 1110 /* rq->sg[1] for data packet, from offset */ 1111 offset = sizeof(struct padded_vnet_hdr); 1112 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1113 1114 /* chain first in list head */ 1115 first->private = (unsigned long)list; 1116 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 1117 first, gfp); 1118 if (err < 0) 1119 give_pages(rq, first); 1120 1121 return err; 1122 } 1123 1124 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1125 struct ewma_pkt_len *avg_pkt_len, 1126 unsigned int room) 1127 { 1128 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1129 unsigned int len; 1130 1131 if (room) 1132 return PAGE_SIZE - room; 1133 1134 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1135 rq->min_buf_len, PAGE_SIZE - hdr_len); 1136 1137 return ALIGN(len, L1_CACHE_BYTES); 1138 } 1139 1140 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1141 struct receive_queue *rq, gfp_t gfp) 1142 { 1143 struct page_frag *alloc_frag = &rq->alloc_frag; 1144 unsigned int headroom = virtnet_get_headroom(vi); 1145 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1146 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1147 char *buf; 1148 void *ctx; 1149 int err; 1150 unsigned int len, hole; 1151 1152 /* Extra tailroom is needed to satisfy XDP's assumption. This 1153 * means rx frags coalescing won't work, but consider we've 1154 * disabled GSO for XDP, it won't be a big issue. 1155 */ 1156 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1157 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1158 return -ENOMEM; 1159 1160 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1161 buf += headroom; /* advance address leaving hole at front of pkt */ 1162 get_page(alloc_frag->page); 1163 alloc_frag->offset += len + room; 1164 hole = alloc_frag->size - alloc_frag->offset; 1165 if (hole < len + room) { 1166 /* To avoid internal fragmentation, if there is very likely not 1167 * enough space for another buffer, add the remaining space to 1168 * the current buffer. 1169 */ 1170 len += hole; 1171 alloc_frag->offset += hole; 1172 } 1173 1174 sg_init_one(rq->sg, buf, len); 1175 ctx = mergeable_len_to_ctx(len, headroom); 1176 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1177 if (err < 0) 1178 put_page(virt_to_head_page(buf)); 1179 1180 return err; 1181 } 1182 1183 /* 1184 * Returns false if we couldn't fill entirely (OOM). 1185 * 1186 * Normally run in the receive path, but can also be run from ndo_open 1187 * before we're receiving packets, or from refill_work which is 1188 * careful to disable receiving (using napi_disable). 1189 */ 1190 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1191 gfp_t gfp) 1192 { 1193 int err; 1194 bool oom; 1195 1196 do { 1197 if (vi->mergeable_rx_bufs) 1198 err = add_recvbuf_mergeable(vi, rq, gfp); 1199 else if (vi->big_packets) 1200 err = add_recvbuf_big(vi, rq, gfp); 1201 else 1202 err = add_recvbuf_small(vi, rq, gfp); 1203 1204 oom = err == -ENOMEM; 1205 if (err) 1206 break; 1207 } while (rq->vq->num_free); 1208 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1209 u64_stats_update_begin(&rq->stats.syncp); 1210 rq->stats.kicks++; 1211 u64_stats_update_end(&rq->stats.syncp); 1212 } 1213 1214 return !oom; 1215 } 1216 1217 static void skb_recv_done(struct virtqueue *rvq) 1218 { 1219 struct virtnet_info *vi = rvq->vdev->priv; 1220 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1221 1222 virtqueue_napi_schedule(&rq->napi, rvq); 1223 } 1224 1225 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1226 { 1227 napi_enable(napi); 1228 1229 /* If all buffers were filled by other side before we napi_enabled, we 1230 * won't get another interrupt, so process any outstanding packets now. 1231 * Call local_bh_enable after to trigger softIRQ processing. 1232 */ 1233 local_bh_disable(); 1234 virtqueue_napi_schedule(napi, vq); 1235 local_bh_enable(); 1236 } 1237 1238 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1239 struct virtqueue *vq, 1240 struct napi_struct *napi) 1241 { 1242 if (!napi->weight) 1243 return; 1244 1245 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1246 * enable the feature if this is likely affine with the transmit path. 1247 */ 1248 if (!vi->affinity_hint_set) { 1249 napi->weight = 0; 1250 return; 1251 } 1252 1253 return virtnet_napi_enable(vq, napi); 1254 } 1255 1256 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1257 { 1258 if (napi->weight) 1259 napi_disable(napi); 1260 } 1261 1262 static void refill_work(struct work_struct *work) 1263 { 1264 struct virtnet_info *vi = 1265 container_of(work, struct virtnet_info, refill.work); 1266 bool still_empty; 1267 int i; 1268 1269 for (i = 0; i < vi->curr_queue_pairs; i++) { 1270 struct receive_queue *rq = &vi->rq[i]; 1271 1272 napi_disable(&rq->napi); 1273 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1274 virtnet_napi_enable(rq->vq, &rq->napi); 1275 1276 /* In theory, this can happen: if we don't get any buffers in 1277 * we will *never* try to fill again. 1278 */ 1279 if (still_empty) 1280 schedule_delayed_work(&vi->refill, HZ/2); 1281 } 1282 } 1283 1284 static int virtnet_receive(struct receive_queue *rq, int budget, 1285 unsigned int *xdp_xmit) 1286 { 1287 struct virtnet_info *vi = rq->vq->vdev->priv; 1288 struct virtnet_rq_stats stats = {}; 1289 unsigned int len; 1290 void *buf; 1291 int i; 1292 1293 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1294 void *ctx; 1295 1296 while (stats.packets < budget && 1297 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1298 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1299 stats.packets++; 1300 } 1301 } else { 1302 while (stats.packets < budget && 1303 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1304 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1305 stats.packets++; 1306 } 1307 } 1308 1309 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 1310 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) 1311 schedule_delayed_work(&vi->refill, 0); 1312 } 1313 1314 u64_stats_update_begin(&rq->stats.syncp); 1315 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1316 size_t offset = virtnet_rq_stats_desc[i].offset; 1317 u64 *item; 1318 1319 item = (u64 *)((u8 *)&rq->stats + offset); 1320 *item += *(u64 *)((u8 *)&stats + offset); 1321 } 1322 u64_stats_update_end(&rq->stats.syncp); 1323 1324 return stats.packets; 1325 } 1326 1327 static void free_old_xmit_skbs(struct send_queue *sq) 1328 { 1329 struct sk_buff *skb; 1330 unsigned int len; 1331 unsigned int packets = 0; 1332 unsigned int bytes = 0; 1333 1334 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 1335 pr_debug("Sent skb %p\n", skb); 1336 1337 bytes += skb->len; 1338 packets++; 1339 1340 dev_consume_skb_any(skb); 1341 } 1342 1343 /* Avoid overhead when no packets have been processed 1344 * happens when called speculatively from start_xmit. 1345 */ 1346 if (!packets) 1347 return; 1348 1349 u64_stats_update_begin(&sq->stats.syncp); 1350 sq->stats.bytes += bytes; 1351 sq->stats.packets += packets; 1352 u64_stats_update_end(&sq->stats.syncp); 1353 } 1354 1355 static void virtnet_poll_cleantx(struct receive_queue *rq) 1356 { 1357 struct virtnet_info *vi = rq->vq->vdev->priv; 1358 unsigned int index = vq2rxq(rq->vq); 1359 struct send_queue *sq = &vi->sq[index]; 1360 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1361 1362 if (!sq->napi.weight) 1363 return; 1364 1365 if (__netif_tx_trylock(txq)) { 1366 free_old_xmit_skbs(sq); 1367 __netif_tx_unlock(txq); 1368 } 1369 1370 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1371 netif_tx_wake_queue(txq); 1372 } 1373 1374 static int virtnet_poll(struct napi_struct *napi, int budget) 1375 { 1376 struct receive_queue *rq = 1377 container_of(napi, struct receive_queue, napi); 1378 struct virtnet_info *vi = rq->vq->vdev->priv; 1379 struct send_queue *sq; 1380 unsigned int received; 1381 unsigned int xdp_xmit = 0; 1382 1383 virtnet_poll_cleantx(rq); 1384 1385 received = virtnet_receive(rq, budget, &xdp_xmit); 1386 1387 /* Out of packets? */ 1388 if (received < budget) 1389 virtqueue_napi_complete(napi, rq->vq, received); 1390 1391 if (xdp_xmit & VIRTIO_XDP_REDIR) 1392 xdp_do_flush_map(); 1393 1394 if (xdp_xmit & VIRTIO_XDP_TX) { 1395 sq = virtnet_xdp_sq(vi); 1396 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1397 u64_stats_update_begin(&sq->stats.syncp); 1398 sq->stats.kicks++; 1399 u64_stats_update_end(&sq->stats.syncp); 1400 } 1401 } 1402 1403 return received; 1404 } 1405 1406 static int virtnet_open(struct net_device *dev) 1407 { 1408 struct virtnet_info *vi = netdev_priv(dev); 1409 int i, err; 1410 1411 for (i = 0; i < vi->max_queue_pairs; i++) { 1412 if (i < vi->curr_queue_pairs) 1413 /* Make sure we have some buffers: if oom use wq. */ 1414 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1415 schedule_delayed_work(&vi->refill, 0); 1416 1417 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i); 1418 if (err < 0) 1419 return err; 1420 1421 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, 1422 MEM_TYPE_PAGE_SHARED, NULL); 1423 if (err < 0) { 1424 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1425 return err; 1426 } 1427 1428 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 1429 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); 1430 } 1431 1432 return 0; 1433 } 1434 1435 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1436 { 1437 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1438 struct virtnet_info *vi = sq->vq->vdev->priv; 1439 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq)); 1440 1441 __netif_tx_lock(txq, raw_smp_processor_id()); 1442 free_old_xmit_skbs(sq); 1443 __netif_tx_unlock(txq); 1444 1445 virtqueue_napi_complete(napi, sq->vq, 0); 1446 1447 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1448 netif_tx_wake_queue(txq); 1449 1450 return 0; 1451 } 1452 1453 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1454 { 1455 struct virtio_net_hdr_mrg_rxbuf *hdr; 1456 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1457 struct virtnet_info *vi = sq->vq->vdev->priv; 1458 int num_sg; 1459 unsigned hdr_len = vi->hdr_len; 1460 bool can_push; 1461 1462 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1463 1464 can_push = vi->any_header_sg && 1465 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1466 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1467 /* Even if we can, don't push here yet as this would skew 1468 * csum_start offset below. */ 1469 if (can_push) 1470 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 1471 else 1472 hdr = skb_vnet_hdr(skb); 1473 1474 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 1475 virtio_is_little_endian(vi->vdev), false, 1476 0)) 1477 BUG(); 1478 1479 if (vi->mergeable_rx_bufs) 1480 hdr->num_buffers = 0; 1481 1482 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 1483 if (can_push) { 1484 __skb_push(skb, hdr_len); 1485 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 1486 if (unlikely(num_sg < 0)) 1487 return num_sg; 1488 /* Pull header back to avoid skew in tx bytes calculations. */ 1489 __skb_pull(skb, hdr_len); 1490 } else { 1491 sg_set_buf(sq->sg, hdr, hdr_len); 1492 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 1493 if (unlikely(num_sg < 0)) 1494 return num_sg; 1495 num_sg++; 1496 } 1497 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 1498 } 1499 1500 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 1501 { 1502 struct virtnet_info *vi = netdev_priv(dev); 1503 int qnum = skb_get_queue_mapping(skb); 1504 struct send_queue *sq = &vi->sq[qnum]; 1505 int err; 1506 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 1507 bool kick = !skb->xmit_more; 1508 bool use_napi = sq->napi.weight; 1509 1510 /* Free up any pending old buffers before queueing new ones. */ 1511 free_old_xmit_skbs(sq); 1512 1513 if (use_napi && kick) 1514 virtqueue_enable_cb_delayed(sq->vq); 1515 1516 /* timestamp packet in software */ 1517 skb_tx_timestamp(skb); 1518 1519 /* Try to transmit */ 1520 err = xmit_skb(sq, skb); 1521 1522 /* This should not happen! */ 1523 if (unlikely(err)) { 1524 dev->stats.tx_fifo_errors++; 1525 if (net_ratelimit()) 1526 dev_warn(&dev->dev, 1527 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 1528 dev->stats.tx_dropped++; 1529 dev_kfree_skb_any(skb); 1530 return NETDEV_TX_OK; 1531 } 1532 1533 /* Don't wait up for transmitted skbs to be freed. */ 1534 if (!use_napi) { 1535 skb_orphan(skb); 1536 nf_reset(skb); 1537 } 1538 1539 /* If running out of space, stop queue to avoid getting packets that we 1540 * are then unable to transmit. 1541 * An alternative would be to force queuing layer to requeue the skb by 1542 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 1543 * returned in a normal path of operation: it means that driver is not 1544 * maintaining the TX queue stop/start state properly, and causes 1545 * the stack to do a non-trivial amount of useless work. 1546 * Since most packets only take 1 or 2 ring slots, stopping the queue 1547 * early means 16 slots are typically wasted. 1548 */ 1549 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 1550 netif_stop_subqueue(dev, qnum); 1551 if (!use_napi && 1552 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 1553 /* More just got used, free them then recheck. */ 1554 free_old_xmit_skbs(sq); 1555 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 1556 netif_start_subqueue(dev, qnum); 1557 virtqueue_disable_cb(sq->vq); 1558 } 1559 } 1560 } 1561 1562 if (kick || netif_xmit_stopped(txq)) { 1563 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1564 u64_stats_update_begin(&sq->stats.syncp); 1565 sq->stats.kicks++; 1566 u64_stats_update_end(&sq->stats.syncp); 1567 } 1568 } 1569 1570 return NETDEV_TX_OK; 1571 } 1572 1573 /* 1574 * Send command via the control virtqueue and check status. Commands 1575 * supported by the hypervisor, as indicated by feature bits, should 1576 * never fail unless improperly formatted. 1577 */ 1578 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 1579 struct scatterlist *out) 1580 { 1581 struct scatterlist *sgs[4], hdr, stat; 1582 unsigned out_num = 0, tmp; 1583 1584 /* Caller should know better */ 1585 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 1586 1587 vi->ctrl->status = ~0; 1588 vi->ctrl->hdr.class = class; 1589 vi->ctrl->hdr.cmd = cmd; 1590 /* Add header */ 1591 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 1592 sgs[out_num++] = &hdr; 1593 1594 if (out) 1595 sgs[out_num++] = out; 1596 1597 /* Add return status. */ 1598 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 1599 sgs[out_num] = &stat; 1600 1601 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 1602 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 1603 1604 if (unlikely(!virtqueue_kick(vi->cvq))) 1605 return vi->ctrl->status == VIRTIO_NET_OK; 1606 1607 /* Spin for a response, the kick causes an ioport write, trapping 1608 * into the hypervisor, so the request should be handled immediately. 1609 */ 1610 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1611 !virtqueue_is_broken(vi->cvq)) 1612 cpu_relax(); 1613 1614 return vi->ctrl->status == VIRTIO_NET_OK; 1615 } 1616 1617 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1618 { 1619 struct virtnet_info *vi = netdev_priv(dev); 1620 struct virtio_device *vdev = vi->vdev; 1621 int ret; 1622 struct sockaddr *addr; 1623 struct scatterlist sg; 1624 1625 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 1626 return -EOPNOTSUPP; 1627 1628 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 1629 if (!addr) 1630 return -ENOMEM; 1631 1632 ret = eth_prepare_mac_addr_change(dev, addr); 1633 if (ret) 1634 goto out; 1635 1636 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1637 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1638 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1639 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1640 dev_warn(&vdev->dev, 1641 "Failed to set mac address by vq command.\n"); 1642 ret = -EINVAL; 1643 goto out; 1644 } 1645 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1646 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1647 unsigned int i; 1648 1649 /* Naturally, this has an atomicity problem. */ 1650 for (i = 0; i < dev->addr_len; i++) 1651 virtio_cwrite8(vdev, 1652 offsetof(struct virtio_net_config, mac) + 1653 i, addr->sa_data[i]); 1654 } 1655 1656 eth_commit_mac_addr_change(dev, p); 1657 ret = 0; 1658 1659 out: 1660 kfree(addr); 1661 return ret; 1662 } 1663 1664 static void virtnet_stats(struct net_device *dev, 1665 struct rtnl_link_stats64 *tot) 1666 { 1667 struct virtnet_info *vi = netdev_priv(dev); 1668 unsigned int start; 1669 int i; 1670 1671 for (i = 0; i < vi->max_queue_pairs; i++) { 1672 u64 tpackets, tbytes, rpackets, rbytes, rdrops; 1673 struct receive_queue *rq = &vi->rq[i]; 1674 struct send_queue *sq = &vi->sq[i]; 1675 1676 do { 1677 start = u64_stats_fetch_begin_irq(&sq->stats.syncp); 1678 tpackets = sq->stats.packets; 1679 tbytes = sq->stats.bytes; 1680 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); 1681 1682 do { 1683 start = u64_stats_fetch_begin_irq(&rq->stats.syncp); 1684 rpackets = rq->stats.packets; 1685 rbytes = rq->stats.bytes; 1686 rdrops = rq->stats.drops; 1687 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); 1688 1689 tot->rx_packets += rpackets; 1690 tot->tx_packets += tpackets; 1691 tot->rx_bytes += rbytes; 1692 tot->tx_bytes += tbytes; 1693 tot->rx_dropped += rdrops; 1694 } 1695 1696 tot->tx_dropped = dev->stats.tx_dropped; 1697 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1698 tot->rx_length_errors = dev->stats.rx_length_errors; 1699 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1700 } 1701 1702 #ifdef CONFIG_NET_POLL_CONTROLLER 1703 static void virtnet_netpoll(struct net_device *dev) 1704 { 1705 struct virtnet_info *vi = netdev_priv(dev); 1706 int i; 1707 1708 for (i = 0; i < vi->curr_queue_pairs; i++) 1709 napi_schedule(&vi->rq[i].napi); 1710 } 1711 #endif 1712 1713 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1714 { 1715 rtnl_lock(); 1716 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1717 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1718 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1719 rtnl_unlock(); 1720 } 1721 1722 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1723 { 1724 struct scatterlist sg; 1725 struct net_device *dev = vi->dev; 1726 1727 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1728 return 0; 1729 1730 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1731 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 1732 1733 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1734 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1735 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1736 queue_pairs); 1737 return -EINVAL; 1738 } else { 1739 vi->curr_queue_pairs = queue_pairs; 1740 /* virtnet_open() will refill when device is going to up. */ 1741 if (dev->flags & IFF_UP) 1742 schedule_delayed_work(&vi->refill, 0); 1743 } 1744 1745 return 0; 1746 } 1747 1748 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1749 { 1750 int err; 1751 1752 rtnl_lock(); 1753 err = _virtnet_set_queues(vi, queue_pairs); 1754 rtnl_unlock(); 1755 return err; 1756 } 1757 1758 static int virtnet_close(struct net_device *dev) 1759 { 1760 struct virtnet_info *vi = netdev_priv(dev); 1761 int i; 1762 1763 /* Make sure refill_work doesn't re-enable napi! */ 1764 cancel_delayed_work_sync(&vi->refill); 1765 1766 for (i = 0; i < vi->max_queue_pairs; i++) { 1767 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1768 napi_disable(&vi->rq[i].napi); 1769 virtnet_napi_tx_disable(&vi->sq[i].napi); 1770 } 1771 1772 return 0; 1773 } 1774 1775 static void virtnet_set_rx_mode(struct net_device *dev) 1776 { 1777 struct virtnet_info *vi = netdev_priv(dev); 1778 struct scatterlist sg[2]; 1779 struct virtio_net_ctrl_mac *mac_data; 1780 struct netdev_hw_addr *ha; 1781 int uc_count; 1782 int mc_count; 1783 void *buf; 1784 int i; 1785 1786 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1787 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1788 return; 1789 1790 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 1791 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1792 1793 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 1794 1795 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1796 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1797 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1798 vi->ctrl->promisc ? "en" : "dis"); 1799 1800 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 1801 1802 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1803 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1804 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1805 vi->ctrl->allmulti ? "en" : "dis"); 1806 1807 uc_count = netdev_uc_count(dev); 1808 mc_count = netdev_mc_count(dev); 1809 /* MAC filter - use one buffer for both lists */ 1810 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1811 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1812 mac_data = buf; 1813 if (!buf) 1814 return; 1815 1816 sg_init_table(sg, 2); 1817 1818 /* Store the unicast list and count in the front of the buffer */ 1819 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1820 i = 0; 1821 netdev_for_each_uc_addr(ha, dev) 1822 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1823 1824 sg_set_buf(&sg[0], mac_data, 1825 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1826 1827 /* multicast list and count fill the end */ 1828 mac_data = (void *)&mac_data->macs[uc_count][0]; 1829 1830 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1831 i = 0; 1832 netdev_for_each_mc_addr(ha, dev) 1833 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1834 1835 sg_set_buf(&sg[1], mac_data, 1836 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1837 1838 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1839 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1840 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1841 1842 kfree(buf); 1843 } 1844 1845 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1846 __be16 proto, u16 vid) 1847 { 1848 struct virtnet_info *vi = netdev_priv(dev); 1849 struct scatterlist sg; 1850 1851 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 1852 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 1853 1854 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1855 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1856 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1857 return 0; 1858 } 1859 1860 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1861 __be16 proto, u16 vid) 1862 { 1863 struct virtnet_info *vi = netdev_priv(dev); 1864 struct scatterlist sg; 1865 1866 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 1867 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 1868 1869 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1870 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1871 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1872 return 0; 1873 } 1874 1875 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1876 { 1877 int i; 1878 1879 if (vi->affinity_hint_set) { 1880 for (i = 0; i < vi->max_queue_pairs; i++) { 1881 virtqueue_set_affinity(vi->rq[i].vq, NULL); 1882 virtqueue_set_affinity(vi->sq[i].vq, NULL); 1883 } 1884 1885 vi->affinity_hint_set = false; 1886 } 1887 } 1888 1889 static void virtnet_set_affinity(struct virtnet_info *vi) 1890 { 1891 cpumask_var_t mask; 1892 int stragglers; 1893 int group_size; 1894 int i, j, cpu; 1895 int num_cpu; 1896 int stride; 1897 1898 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 1899 virtnet_clean_affinity(vi, -1); 1900 return; 1901 } 1902 1903 num_cpu = num_online_cpus(); 1904 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 1905 stragglers = num_cpu >= vi->curr_queue_pairs ? 1906 num_cpu % vi->curr_queue_pairs : 1907 0; 1908 cpu = cpumask_next(-1, cpu_online_mask); 1909 1910 for (i = 0; i < vi->curr_queue_pairs; i++) { 1911 group_size = stride + (i < stragglers ? 1 : 0); 1912 1913 for (j = 0; j < group_size; j++) { 1914 cpumask_set_cpu(cpu, mask); 1915 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 1916 nr_cpu_ids, false); 1917 } 1918 virtqueue_set_affinity(vi->rq[i].vq, mask); 1919 virtqueue_set_affinity(vi->sq[i].vq, mask); 1920 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false); 1921 cpumask_clear(mask); 1922 } 1923 1924 vi->affinity_hint_set = true; 1925 free_cpumask_var(mask); 1926 } 1927 1928 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 1929 { 1930 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 1931 node); 1932 virtnet_set_affinity(vi); 1933 return 0; 1934 } 1935 1936 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 1937 { 1938 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 1939 node_dead); 1940 virtnet_set_affinity(vi); 1941 return 0; 1942 } 1943 1944 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 1945 { 1946 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 1947 node); 1948 1949 virtnet_clean_affinity(vi, cpu); 1950 return 0; 1951 } 1952 1953 static enum cpuhp_state virtionet_online; 1954 1955 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 1956 { 1957 int ret; 1958 1959 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 1960 if (ret) 1961 return ret; 1962 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 1963 &vi->node_dead); 1964 if (!ret) 1965 return ret; 1966 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 1967 return ret; 1968 } 1969 1970 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 1971 { 1972 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 1973 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 1974 &vi->node_dead); 1975 } 1976 1977 static void virtnet_get_ringparam(struct net_device *dev, 1978 struct ethtool_ringparam *ring) 1979 { 1980 struct virtnet_info *vi = netdev_priv(dev); 1981 1982 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1983 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1984 ring->rx_pending = ring->rx_max_pending; 1985 ring->tx_pending = ring->tx_max_pending; 1986 } 1987 1988 1989 static void virtnet_get_drvinfo(struct net_device *dev, 1990 struct ethtool_drvinfo *info) 1991 { 1992 struct virtnet_info *vi = netdev_priv(dev); 1993 struct virtio_device *vdev = vi->vdev; 1994 1995 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1996 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1997 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1998 1999 } 2000 2001 /* TODO: Eliminate OOO packets during switching */ 2002 static int virtnet_set_channels(struct net_device *dev, 2003 struct ethtool_channels *channels) 2004 { 2005 struct virtnet_info *vi = netdev_priv(dev); 2006 u16 queue_pairs = channels->combined_count; 2007 int err; 2008 2009 /* We don't support separate rx/tx channels. 2010 * We don't allow setting 'other' channels. 2011 */ 2012 if (channels->rx_count || channels->tx_count || channels->other_count) 2013 return -EINVAL; 2014 2015 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2016 return -EINVAL; 2017 2018 /* For now we don't support modifying channels while XDP is loaded 2019 * also when XDP is loaded all RX queues have XDP programs so we only 2020 * need to check a single RX queue. 2021 */ 2022 if (vi->rq[0].xdp_prog) 2023 return -EINVAL; 2024 2025 get_online_cpus(); 2026 err = _virtnet_set_queues(vi, queue_pairs); 2027 if (!err) { 2028 netif_set_real_num_tx_queues(dev, queue_pairs); 2029 netif_set_real_num_rx_queues(dev, queue_pairs); 2030 2031 virtnet_set_affinity(vi); 2032 } 2033 put_online_cpus(); 2034 2035 return err; 2036 } 2037 2038 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2039 { 2040 struct virtnet_info *vi = netdev_priv(dev); 2041 char *p = (char *)data; 2042 unsigned int i, j; 2043 2044 switch (stringset) { 2045 case ETH_SS_STATS: 2046 for (i = 0; i < vi->curr_queue_pairs; i++) { 2047 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2048 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", 2049 i, virtnet_rq_stats_desc[j].desc); 2050 p += ETH_GSTRING_LEN; 2051 } 2052 } 2053 2054 for (i = 0; i < vi->curr_queue_pairs; i++) { 2055 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2056 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s", 2057 i, virtnet_sq_stats_desc[j].desc); 2058 p += ETH_GSTRING_LEN; 2059 } 2060 } 2061 break; 2062 } 2063 } 2064 2065 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2066 { 2067 struct virtnet_info *vi = netdev_priv(dev); 2068 2069 switch (sset) { 2070 case ETH_SS_STATS: 2071 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2072 VIRTNET_SQ_STATS_LEN); 2073 default: 2074 return -EOPNOTSUPP; 2075 } 2076 } 2077 2078 static void virtnet_get_ethtool_stats(struct net_device *dev, 2079 struct ethtool_stats *stats, u64 *data) 2080 { 2081 struct virtnet_info *vi = netdev_priv(dev); 2082 unsigned int idx = 0, start, i, j; 2083 const u8 *stats_base; 2084 size_t offset; 2085 2086 for (i = 0; i < vi->curr_queue_pairs; i++) { 2087 struct receive_queue *rq = &vi->rq[i]; 2088 2089 stats_base = (u8 *)&rq->stats; 2090 do { 2091 start = u64_stats_fetch_begin_irq(&rq->stats.syncp); 2092 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2093 offset = virtnet_rq_stats_desc[j].offset; 2094 data[idx + j] = *(u64 *)(stats_base + offset); 2095 } 2096 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); 2097 idx += VIRTNET_RQ_STATS_LEN; 2098 } 2099 2100 for (i = 0; i < vi->curr_queue_pairs; i++) { 2101 struct send_queue *sq = &vi->sq[i]; 2102 2103 stats_base = (u8 *)&sq->stats; 2104 do { 2105 start = u64_stats_fetch_begin_irq(&sq->stats.syncp); 2106 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2107 offset = virtnet_sq_stats_desc[j].offset; 2108 data[idx + j] = *(u64 *)(stats_base + offset); 2109 } 2110 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); 2111 idx += VIRTNET_SQ_STATS_LEN; 2112 } 2113 } 2114 2115 static void virtnet_get_channels(struct net_device *dev, 2116 struct ethtool_channels *channels) 2117 { 2118 struct virtnet_info *vi = netdev_priv(dev); 2119 2120 channels->combined_count = vi->curr_queue_pairs; 2121 channels->max_combined = vi->max_queue_pairs; 2122 channels->max_other = 0; 2123 channels->rx_count = 0; 2124 channels->tx_count = 0; 2125 channels->other_count = 0; 2126 } 2127 2128 /* Check if the user is trying to change anything besides speed/duplex */ 2129 static bool 2130 virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd) 2131 { 2132 struct ethtool_link_ksettings diff1 = *cmd; 2133 struct ethtool_link_ksettings diff2 = {}; 2134 2135 /* cmd is always set so we need to clear it, validate the port type 2136 * and also without autonegotiation we can ignore advertising 2137 */ 2138 diff1.base.speed = 0; 2139 diff2.base.port = PORT_OTHER; 2140 ethtool_link_ksettings_zero_link_mode(&diff1, advertising); 2141 diff1.base.duplex = 0; 2142 diff1.base.cmd = 0; 2143 diff1.base.link_mode_masks_nwords = 0; 2144 2145 return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) && 2146 bitmap_empty(diff1.link_modes.supported, 2147 __ETHTOOL_LINK_MODE_MASK_NBITS) && 2148 bitmap_empty(diff1.link_modes.advertising, 2149 __ETHTOOL_LINK_MODE_MASK_NBITS) && 2150 bitmap_empty(diff1.link_modes.lp_advertising, 2151 __ETHTOOL_LINK_MODE_MASK_NBITS); 2152 } 2153 2154 static int virtnet_set_link_ksettings(struct net_device *dev, 2155 const struct ethtool_link_ksettings *cmd) 2156 { 2157 struct virtnet_info *vi = netdev_priv(dev); 2158 u32 speed; 2159 2160 speed = cmd->base.speed; 2161 /* don't allow custom speed and duplex */ 2162 if (!ethtool_validate_speed(speed) || 2163 !ethtool_validate_duplex(cmd->base.duplex) || 2164 !virtnet_validate_ethtool_cmd(cmd)) 2165 return -EINVAL; 2166 vi->speed = speed; 2167 vi->duplex = cmd->base.duplex; 2168 2169 return 0; 2170 } 2171 2172 static int virtnet_get_link_ksettings(struct net_device *dev, 2173 struct ethtool_link_ksettings *cmd) 2174 { 2175 struct virtnet_info *vi = netdev_priv(dev); 2176 2177 cmd->base.speed = vi->speed; 2178 cmd->base.duplex = vi->duplex; 2179 cmd->base.port = PORT_OTHER; 2180 2181 return 0; 2182 } 2183 2184 static void virtnet_init_settings(struct net_device *dev) 2185 { 2186 struct virtnet_info *vi = netdev_priv(dev); 2187 2188 vi->speed = SPEED_UNKNOWN; 2189 vi->duplex = DUPLEX_UNKNOWN; 2190 } 2191 2192 static void virtnet_update_settings(struct virtnet_info *vi) 2193 { 2194 u32 speed; 2195 u8 duplex; 2196 2197 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 2198 return; 2199 2200 speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config, 2201 speed)); 2202 if (ethtool_validate_speed(speed)) 2203 vi->speed = speed; 2204 duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config, 2205 duplex)); 2206 if (ethtool_validate_duplex(duplex)) 2207 vi->duplex = duplex; 2208 } 2209 2210 static const struct ethtool_ops virtnet_ethtool_ops = { 2211 .get_drvinfo = virtnet_get_drvinfo, 2212 .get_link = ethtool_op_get_link, 2213 .get_ringparam = virtnet_get_ringparam, 2214 .get_strings = virtnet_get_strings, 2215 .get_sset_count = virtnet_get_sset_count, 2216 .get_ethtool_stats = virtnet_get_ethtool_stats, 2217 .set_channels = virtnet_set_channels, 2218 .get_channels = virtnet_get_channels, 2219 .get_ts_info = ethtool_op_get_ts_info, 2220 .get_link_ksettings = virtnet_get_link_ksettings, 2221 .set_link_ksettings = virtnet_set_link_ksettings, 2222 }; 2223 2224 static void virtnet_freeze_down(struct virtio_device *vdev) 2225 { 2226 struct virtnet_info *vi = vdev->priv; 2227 int i; 2228 2229 /* Make sure no work handler is accessing the device */ 2230 flush_work(&vi->config_work); 2231 2232 netif_device_detach(vi->dev); 2233 netif_tx_disable(vi->dev); 2234 cancel_delayed_work_sync(&vi->refill); 2235 2236 if (netif_running(vi->dev)) { 2237 for (i = 0; i < vi->max_queue_pairs; i++) { 2238 napi_disable(&vi->rq[i].napi); 2239 virtnet_napi_tx_disable(&vi->sq[i].napi); 2240 } 2241 } 2242 } 2243 2244 static int init_vqs(struct virtnet_info *vi); 2245 2246 static int virtnet_restore_up(struct virtio_device *vdev) 2247 { 2248 struct virtnet_info *vi = vdev->priv; 2249 int err, i; 2250 2251 err = init_vqs(vi); 2252 if (err) 2253 return err; 2254 2255 virtio_device_ready(vdev); 2256 2257 if (netif_running(vi->dev)) { 2258 for (i = 0; i < vi->curr_queue_pairs; i++) 2259 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 2260 schedule_delayed_work(&vi->refill, 0); 2261 2262 for (i = 0; i < vi->max_queue_pairs; i++) { 2263 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2264 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 2265 &vi->sq[i].napi); 2266 } 2267 } 2268 2269 netif_device_attach(vi->dev); 2270 return err; 2271 } 2272 2273 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 2274 { 2275 struct scatterlist sg; 2276 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 2277 2278 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 2279 2280 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 2281 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 2282 dev_warn(&vi->dev->dev, "Fail to set guest offload. \n"); 2283 return -EINVAL; 2284 } 2285 2286 return 0; 2287 } 2288 2289 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 2290 { 2291 u64 offloads = 0; 2292 2293 if (!vi->guest_offloads) 2294 return 0; 2295 2296 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM)) 2297 offloads = 1ULL << VIRTIO_NET_F_GUEST_CSUM; 2298 2299 return virtnet_set_guest_offloads(vi, offloads); 2300 } 2301 2302 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 2303 { 2304 u64 offloads = vi->guest_offloads; 2305 2306 if (!vi->guest_offloads) 2307 return 0; 2308 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM)) 2309 offloads |= 1ULL << VIRTIO_NET_F_GUEST_CSUM; 2310 2311 return virtnet_set_guest_offloads(vi, offloads); 2312 } 2313 2314 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 2315 struct netlink_ext_ack *extack) 2316 { 2317 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); 2318 struct virtnet_info *vi = netdev_priv(dev); 2319 struct bpf_prog *old_prog; 2320 u16 xdp_qp = 0, curr_qp; 2321 int i, err; 2322 2323 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 2324 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 2325 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 2326 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 2327 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO))) { 2328 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO, disable LRO first"); 2329 return -EOPNOTSUPP; 2330 } 2331 2332 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 2333 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 2334 return -EINVAL; 2335 } 2336 2337 if (dev->mtu > max_sz) { 2338 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); 2339 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); 2340 return -EINVAL; 2341 } 2342 2343 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 2344 if (prog) 2345 xdp_qp = nr_cpu_ids; 2346 2347 /* XDP requires extra queues for XDP_TX */ 2348 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 2349 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); 2350 netdev_warn(dev, "request %i queues but max is %i\n", 2351 curr_qp + xdp_qp, vi->max_queue_pairs); 2352 return -ENOMEM; 2353 } 2354 2355 if (prog) { 2356 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); 2357 if (IS_ERR(prog)) 2358 return PTR_ERR(prog); 2359 } 2360 2361 /* Make sure NAPI is not using any XDP TX queues for RX. */ 2362 if (netif_running(dev)) 2363 for (i = 0; i < vi->max_queue_pairs; i++) 2364 napi_disable(&vi->rq[i].napi); 2365 2366 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 2367 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 2368 if (err) 2369 goto err; 2370 vi->xdp_queue_pairs = xdp_qp; 2371 2372 for (i = 0; i < vi->max_queue_pairs; i++) { 2373 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2374 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 2375 if (i == 0) { 2376 if (!old_prog) 2377 virtnet_clear_guest_offloads(vi); 2378 if (!prog) 2379 virtnet_restore_guest_offloads(vi); 2380 } 2381 if (old_prog) 2382 bpf_prog_put(old_prog); 2383 if (netif_running(dev)) 2384 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2385 } 2386 2387 return 0; 2388 2389 err: 2390 for (i = 0; i < vi->max_queue_pairs; i++) 2391 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2392 if (prog) 2393 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 2394 return err; 2395 } 2396 2397 static u32 virtnet_xdp_query(struct net_device *dev) 2398 { 2399 struct virtnet_info *vi = netdev_priv(dev); 2400 const struct bpf_prog *xdp_prog; 2401 int i; 2402 2403 for (i = 0; i < vi->max_queue_pairs; i++) { 2404 xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2405 if (xdp_prog) 2406 return xdp_prog->aux->id; 2407 } 2408 return 0; 2409 } 2410 2411 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 2412 { 2413 switch (xdp->command) { 2414 case XDP_SETUP_PROG: 2415 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 2416 case XDP_QUERY_PROG: 2417 xdp->prog_id = virtnet_xdp_query(dev); 2418 return 0; 2419 default: 2420 return -EINVAL; 2421 } 2422 } 2423 2424 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 2425 size_t len) 2426 { 2427 struct virtnet_info *vi = netdev_priv(dev); 2428 int ret; 2429 2430 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2431 return -EOPNOTSUPP; 2432 2433 ret = snprintf(buf, len, "sby"); 2434 if (ret >= len) 2435 return -EOPNOTSUPP; 2436 2437 return 0; 2438 } 2439 2440 static const struct net_device_ops virtnet_netdev = { 2441 .ndo_open = virtnet_open, 2442 .ndo_stop = virtnet_close, 2443 .ndo_start_xmit = start_xmit, 2444 .ndo_validate_addr = eth_validate_addr, 2445 .ndo_set_mac_address = virtnet_set_mac_address, 2446 .ndo_set_rx_mode = virtnet_set_rx_mode, 2447 .ndo_get_stats64 = virtnet_stats, 2448 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 2449 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 2450 #ifdef CONFIG_NET_POLL_CONTROLLER 2451 .ndo_poll_controller = virtnet_netpoll, 2452 #endif 2453 .ndo_bpf = virtnet_xdp, 2454 .ndo_xdp_xmit = virtnet_xdp_xmit, 2455 .ndo_features_check = passthru_features_check, 2456 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 2457 }; 2458 2459 static void virtnet_config_changed_work(struct work_struct *work) 2460 { 2461 struct virtnet_info *vi = 2462 container_of(work, struct virtnet_info, config_work); 2463 u16 v; 2464 2465 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 2466 struct virtio_net_config, status, &v) < 0) 2467 return; 2468 2469 if (v & VIRTIO_NET_S_ANNOUNCE) { 2470 netdev_notify_peers(vi->dev); 2471 virtnet_ack_link_announce(vi); 2472 } 2473 2474 /* Ignore unknown (future) status bits */ 2475 v &= VIRTIO_NET_S_LINK_UP; 2476 2477 if (vi->status == v) 2478 return; 2479 2480 vi->status = v; 2481 2482 if (vi->status & VIRTIO_NET_S_LINK_UP) { 2483 virtnet_update_settings(vi); 2484 netif_carrier_on(vi->dev); 2485 netif_tx_wake_all_queues(vi->dev); 2486 } else { 2487 netif_carrier_off(vi->dev); 2488 netif_tx_stop_all_queues(vi->dev); 2489 } 2490 } 2491 2492 static void virtnet_config_changed(struct virtio_device *vdev) 2493 { 2494 struct virtnet_info *vi = vdev->priv; 2495 2496 schedule_work(&vi->config_work); 2497 } 2498 2499 static void virtnet_free_queues(struct virtnet_info *vi) 2500 { 2501 int i; 2502 2503 for (i = 0; i < vi->max_queue_pairs; i++) { 2504 napi_hash_del(&vi->rq[i].napi); 2505 netif_napi_del(&vi->rq[i].napi); 2506 netif_napi_del(&vi->sq[i].napi); 2507 } 2508 2509 /* We called napi_hash_del() before netif_napi_del(), 2510 * we need to respect an RCU grace period before freeing vi->rq 2511 */ 2512 synchronize_net(); 2513 2514 kfree(vi->rq); 2515 kfree(vi->sq); 2516 kfree(vi->ctrl); 2517 } 2518 2519 static void _free_receive_bufs(struct virtnet_info *vi) 2520 { 2521 struct bpf_prog *old_prog; 2522 int i; 2523 2524 for (i = 0; i < vi->max_queue_pairs; i++) { 2525 while (vi->rq[i].pages) 2526 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 2527 2528 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2529 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 2530 if (old_prog) 2531 bpf_prog_put(old_prog); 2532 } 2533 } 2534 2535 static void free_receive_bufs(struct virtnet_info *vi) 2536 { 2537 rtnl_lock(); 2538 _free_receive_bufs(vi); 2539 rtnl_unlock(); 2540 } 2541 2542 static void free_receive_page_frags(struct virtnet_info *vi) 2543 { 2544 int i; 2545 for (i = 0; i < vi->max_queue_pairs; i++) 2546 if (vi->rq[i].alloc_frag.page) 2547 put_page(vi->rq[i].alloc_frag.page); 2548 } 2549 2550 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) 2551 { 2552 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) 2553 return false; 2554 else if (q < vi->curr_queue_pairs) 2555 return true; 2556 else 2557 return false; 2558 } 2559 2560 static void free_unused_bufs(struct virtnet_info *vi) 2561 { 2562 void *buf; 2563 int i; 2564 2565 for (i = 0; i < vi->max_queue_pairs; i++) { 2566 struct virtqueue *vq = vi->sq[i].vq; 2567 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 2568 if (!is_xdp_raw_buffer_queue(vi, i)) 2569 dev_kfree_skb(buf); 2570 else 2571 put_page(virt_to_head_page(buf)); 2572 } 2573 } 2574 2575 for (i = 0; i < vi->max_queue_pairs; i++) { 2576 struct virtqueue *vq = vi->rq[i].vq; 2577 2578 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 2579 if (vi->mergeable_rx_bufs) { 2580 put_page(virt_to_head_page(buf)); 2581 } else if (vi->big_packets) { 2582 give_pages(&vi->rq[i], buf); 2583 } else { 2584 put_page(virt_to_head_page(buf)); 2585 } 2586 } 2587 } 2588 } 2589 2590 static void virtnet_del_vqs(struct virtnet_info *vi) 2591 { 2592 struct virtio_device *vdev = vi->vdev; 2593 2594 virtnet_clean_affinity(vi, -1); 2595 2596 vdev->config->del_vqs(vdev); 2597 2598 virtnet_free_queues(vi); 2599 } 2600 2601 /* How large should a single buffer be so a queue full of these can fit at 2602 * least one full packet? 2603 * Logic below assumes the mergeable buffer header is used. 2604 */ 2605 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 2606 { 2607 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2608 unsigned int rq_size = virtqueue_get_vring_size(vq); 2609 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 2610 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 2611 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 2612 2613 return max(max(min_buf_len, hdr_len) - hdr_len, 2614 (unsigned int)GOOD_PACKET_LEN); 2615 } 2616 2617 static int virtnet_find_vqs(struct virtnet_info *vi) 2618 { 2619 vq_callback_t **callbacks; 2620 struct virtqueue **vqs; 2621 int ret = -ENOMEM; 2622 int i, total_vqs; 2623 const char **names; 2624 bool *ctx; 2625 2626 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 2627 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 2628 * possible control vq. 2629 */ 2630 total_vqs = vi->max_queue_pairs * 2 + 2631 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 2632 2633 /* Allocate space for find_vqs parameters */ 2634 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 2635 if (!vqs) 2636 goto err_vq; 2637 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 2638 if (!callbacks) 2639 goto err_callback; 2640 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 2641 if (!names) 2642 goto err_names; 2643 if (!vi->big_packets || vi->mergeable_rx_bufs) { 2644 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 2645 if (!ctx) 2646 goto err_ctx; 2647 } else { 2648 ctx = NULL; 2649 } 2650 2651 /* Parameters for control virtqueue, if any */ 2652 if (vi->has_cvq) { 2653 callbacks[total_vqs - 1] = NULL; 2654 names[total_vqs - 1] = "control"; 2655 } 2656 2657 /* Allocate/initialize parameters for send/receive virtqueues */ 2658 for (i = 0; i < vi->max_queue_pairs; i++) { 2659 callbacks[rxq2vq(i)] = skb_recv_done; 2660 callbacks[txq2vq(i)] = skb_xmit_done; 2661 sprintf(vi->rq[i].name, "input.%d", i); 2662 sprintf(vi->sq[i].name, "output.%d", i); 2663 names[rxq2vq(i)] = vi->rq[i].name; 2664 names[txq2vq(i)] = vi->sq[i].name; 2665 if (ctx) 2666 ctx[rxq2vq(i)] = true; 2667 } 2668 2669 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 2670 names, ctx, NULL); 2671 if (ret) 2672 goto err_find; 2673 2674 if (vi->has_cvq) { 2675 vi->cvq = vqs[total_vqs - 1]; 2676 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 2677 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 2678 } 2679 2680 for (i = 0; i < vi->max_queue_pairs; i++) { 2681 vi->rq[i].vq = vqs[rxq2vq(i)]; 2682 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 2683 vi->sq[i].vq = vqs[txq2vq(i)]; 2684 } 2685 2686 /* run here: ret == 0. */ 2687 2688 2689 err_find: 2690 kfree(ctx); 2691 err_ctx: 2692 kfree(names); 2693 err_names: 2694 kfree(callbacks); 2695 err_callback: 2696 kfree(vqs); 2697 err_vq: 2698 return ret; 2699 } 2700 2701 static int virtnet_alloc_queues(struct virtnet_info *vi) 2702 { 2703 int i; 2704 2705 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 2706 if (!vi->ctrl) 2707 goto err_ctrl; 2708 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 2709 if (!vi->sq) 2710 goto err_sq; 2711 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 2712 if (!vi->rq) 2713 goto err_rq; 2714 2715 INIT_DELAYED_WORK(&vi->refill, refill_work); 2716 for (i = 0; i < vi->max_queue_pairs; i++) { 2717 vi->rq[i].pages = NULL; 2718 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 2719 napi_weight); 2720 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, 2721 napi_tx ? napi_weight : 0); 2722 2723 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 2724 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 2725 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 2726 2727 u64_stats_init(&vi->rq[i].stats.syncp); 2728 u64_stats_init(&vi->sq[i].stats.syncp); 2729 } 2730 2731 return 0; 2732 2733 err_rq: 2734 kfree(vi->sq); 2735 err_sq: 2736 kfree(vi->ctrl); 2737 err_ctrl: 2738 return -ENOMEM; 2739 } 2740 2741 static int init_vqs(struct virtnet_info *vi) 2742 { 2743 int ret; 2744 2745 /* Allocate send & receive queues */ 2746 ret = virtnet_alloc_queues(vi); 2747 if (ret) 2748 goto err; 2749 2750 ret = virtnet_find_vqs(vi); 2751 if (ret) 2752 goto err_free; 2753 2754 get_online_cpus(); 2755 virtnet_set_affinity(vi); 2756 put_online_cpus(); 2757 2758 return 0; 2759 2760 err_free: 2761 virtnet_free_queues(vi); 2762 err: 2763 return ret; 2764 } 2765 2766 #ifdef CONFIG_SYSFS 2767 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 2768 char *buf) 2769 { 2770 struct virtnet_info *vi = netdev_priv(queue->dev); 2771 unsigned int queue_index = get_netdev_rx_queue_index(queue); 2772 unsigned int headroom = virtnet_get_headroom(vi); 2773 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 2774 struct ewma_pkt_len *avg; 2775 2776 BUG_ON(queue_index >= vi->max_queue_pairs); 2777 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 2778 return sprintf(buf, "%u\n", 2779 get_mergeable_buf_len(&vi->rq[queue_index], avg, 2780 SKB_DATA_ALIGN(headroom + tailroom))); 2781 } 2782 2783 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 2784 __ATTR_RO(mergeable_rx_buffer_size); 2785 2786 static struct attribute *virtio_net_mrg_rx_attrs[] = { 2787 &mergeable_rx_buffer_size_attribute.attr, 2788 NULL 2789 }; 2790 2791 static const struct attribute_group virtio_net_mrg_rx_group = { 2792 .name = "virtio_net", 2793 .attrs = virtio_net_mrg_rx_attrs 2794 }; 2795 #endif 2796 2797 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 2798 unsigned int fbit, 2799 const char *fname, const char *dname) 2800 { 2801 if (!virtio_has_feature(vdev, fbit)) 2802 return false; 2803 2804 dev_err(&vdev->dev, "device advertises feature %s but not %s", 2805 fname, dname); 2806 2807 return true; 2808 } 2809 2810 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 2811 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 2812 2813 static bool virtnet_validate_features(struct virtio_device *vdev) 2814 { 2815 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 2816 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 2817 "VIRTIO_NET_F_CTRL_VQ") || 2818 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 2819 "VIRTIO_NET_F_CTRL_VQ") || 2820 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 2821 "VIRTIO_NET_F_CTRL_VQ") || 2822 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 2823 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 2824 "VIRTIO_NET_F_CTRL_VQ"))) { 2825 return false; 2826 } 2827 2828 return true; 2829 } 2830 2831 #define MIN_MTU ETH_MIN_MTU 2832 #define MAX_MTU ETH_MAX_MTU 2833 2834 static int virtnet_validate(struct virtio_device *vdev) 2835 { 2836 if (!vdev->config->get) { 2837 dev_err(&vdev->dev, "%s failure: config access disabled\n", 2838 __func__); 2839 return -EINVAL; 2840 } 2841 2842 if (!virtnet_validate_features(vdev)) 2843 return -EINVAL; 2844 2845 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 2846 int mtu = virtio_cread16(vdev, 2847 offsetof(struct virtio_net_config, 2848 mtu)); 2849 if (mtu < MIN_MTU) 2850 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 2851 } 2852 2853 return 0; 2854 } 2855 2856 static int virtnet_probe(struct virtio_device *vdev) 2857 { 2858 int i, err = -ENOMEM; 2859 struct net_device *dev; 2860 struct virtnet_info *vi; 2861 u16 max_queue_pairs; 2862 int mtu; 2863 2864 /* Find if host supports multiqueue virtio_net device */ 2865 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 2866 struct virtio_net_config, 2867 max_virtqueue_pairs, &max_queue_pairs); 2868 2869 /* We need at least 2 queue's */ 2870 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 2871 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 2872 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 2873 max_queue_pairs = 1; 2874 2875 /* Allocate ourselves a network device with room for our info */ 2876 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 2877 if (!dev) 2878 return -ENOMEM; 2879 2880 /* Set up network device as normal. */ 2881 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 2882 dev->netdev_ops = &virtnet_netdev; 2883 dev->features = NETIF_F_HIGHDMA; 2884 2885 dev->ethtool_ops = &virtnet_ethtool_ops; 2886 SET_NETDEV_DEV(dev, &vdev->dev); 2887 2888 /* Do we support "hardware" checksums? */ 2889 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 2890 /* This opens up the world of extra features. */ 2891 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 2892 if (csum) 2893 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 2894 2895 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 2896 dev->hw_features |= NETIF_F_TSO 2897 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 2898 } 2899 /* Individual feature bits: what can host handle? */ 2900 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 2901 dev->hw_features |= NETIF_F_TSO; 2902 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 2903 dev->hw_features |= NETIF_F_TSO6; 2904 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 2905 dev->hw_features |= NETIF_F_TSO_ECN; 2906 2907 dev->features |= NETIF_F_GSO_ROBUST; 2908 2909 if (gso) 2910 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 2911 /* (!csum && gso) case will be fixed by register_netdev() */ 2912 } 2913 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 2914 dev->features |= NETIF_F_RXCSUM; 2915 2916 dev->vlan_features = dev->features; 2917 2918 /* MTU range: 68 - 65535 */ 2919 dev->min_mtu = MIN_MTU; 2920 dev->max_mtu = MAX_MTU; 2921 2922 /* Configuration may specify what MAC to use. Otherwise random. */ 2923 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 2924 virtio_cread_bytes(vdev, 2925 offsetof(struct virtio_net_config, mac), 2926 dev->dev_addr, dev->addr_len); 2927 else 2928 eth_hw_addr_random(dev); 2929 2930 /* Set up our device-specific information */ 2931 vi = netdev_priv(dev); 2932 vi->dev = dev; 2933 vi->vdev = vdev; 2934 vdev->priv = vi; 2935 2936 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 2937 2938 /* If we can receive ANY GSO packets, we must allocate large ones. */ 2939 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 2940 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 2941 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 2942 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 2943 vi->big_packets = true; 2944 2945 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 2946 vi->mergeable_rx_bufs = true; 2947 2948 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 2949 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 2950 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2951 else 2952 vi->hdr_len = sizeof(struct virtio_net_hdr); 2953 2954 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 2955 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 2956 vi->any_header_sg = true; 2957 2958 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 2959 vi->has_cvq = true; 2960 2961 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 2962 mtu = virtio_cread16(vdev, 2963 offsetof(struct virtio_net_config, 2964 mtu)); 2965 if (mtu < dev->min_mtu) { 2966 /* Should never trigger: MTU was previously validated 2967 * in virtnet_validate. 2968 */ 2969 dev_err(&vdev->dev, "device MTU appears to have changed " 2970 "it is now %d < %d", mtu, dev->min_mtu); 2971 goto free; 2972 } 2973 2974 dev->mtu = mtu; 2975 dev->max_mtu = mtu; 2976 2977 /* TODO: size buffers correctly in this case. */ 2978 if (dev->mtu > ETH_DATA_LEN) 2979 vi->big_packets = true; 2980 } 2981 2982 if (vi->any_header_sg) 2983 dev->needed_headroom = vi->hdr_len; 2984 2985 /* Enable multiqueue by default */ 2986 if (num_online_cpus() >= max_queue_pairs) 2987 vi->curr_queue_pairs = max_queue_pairs; 2988 else 2989 vi->curr_queue_pairs = num_online_cpus(); 2990 vi->max_queue_pairs = max_queue_pairs; 2991 2992 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 2993 err = init_vqs(vi); 2994 if (err) 2995 goto free; 2996 2997 #ifdef CONFIG_SYSFS 2998 if (vi->mergeable_rx_bufs) 2999 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 3000 #endif 3001 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 3002 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 3003 3004 virtnet_init_settings(dev); 3005 3006 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 3007 vi->failover = net_failover_create(vi->dev); 3008 if (IS_ERR(vi->failover)) { 3009 err = PTR_ERR(vi->failover); 3010 goto free_vqs; 3011 } 3012 } 3013 3014 err = register_netdev(dev); 3015 if (err) { 3016 pr_debug("virtio_net: registering device failed\n"); 3017 goto free_failover; 3018 } 3019 3020 virtio_device_ready(vdev); 3021 3022 err = virtnet_cpu_notif_add(vi); 3023 if (err) { 3024 pr_debug("virtio_net: registering cpu notifier failed\n"); 3025 goto free_unregister_netdev; 3026 } 3027 3028 virtnet_set_queues(vi, vi->curr_queue_pairs); 3029 3030 /* Assume link up if device can't report link status, 3031 otherwise get link status from config. */ 3032 netif_carrier_off(dev); 3033 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 3034 schedule_work(&vi->config_work); 3035 } else { 3036 vi->status = VIRTIO_NET_S_LINK_UP; 3037 virtnet_update_settings(vi); 3038 netif_carrier_on(dev); 3039 } 3040 3041 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 3042 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 3043 set_bit(guest_offloads[i], &vi->guest_offloads); 3044 3045 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 3046 dev->name, max_queue_pairs); 3047 3048 return 0; 3049 3050 free_unregister_netdev: 3051 vi->vdev->config->reset(vdev); 3052 3053 unregister_netdev(dev); 3054 free_failover: 3055 net_failover_destroy(vi->failover); 3056 free_vqs: 3057 cancel_delayed_work_sync(&vi->refill); 3058 free_receive_page_frags(vi); 3059 virtnet_del_vqs(vi); 3060 free: 3061 free_netdev(dev); 3062 return err; 3063 } 3064 3065 static void remove_vq_common(struct virtnet_info *vi) 3066 { 3067 vi->vdev->config->reset(vi->vdev); 3068 3069 /* Free unused buffers in both send and recv, if any. */ 3070 free_unused_bufs(vi); 3071 3072 free_receive_bufs(vi); 3073 3074 free_receive_page_frags(vi); 3075 3076 virtnet_del_vqs(vi); 3077 } 3078 3079 static void virtnet_remove(struct virtio_device *vdev) 3080 { 3081 struct virtnet_info *vi = vdev->priv; 3082 3083 virtnet_cpu_notif_remove(vi); 3084 3085 /* Make sure no work handler is accessing the device. */ 3086 flush_work(&vi->config_work); 3087 3088 unregister_netdev(vi->dev); 3089 3090 net_failover_destroy(vi->failover); 3091 3092 remove_vq_common(vi); 3093 3094 free_netdev(vi->dev); 3095 } 3096 3097 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 3098 { 3099 struct virtnet_info *vi = vdev->priv; 3100 3101 virtnet_cpu_notif_remove(vi); 3102 virtnet_freeze_down(vdev); 3103 remove_vq_common(vi); 3104 3105 return 0; 3106 } 3107 3108 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 3109 { 3110 struct virtnet_info *vi = vdev->priv; 3111 int err; 3112 3113 err = virtnet_restore_up(vdev); 3114 if (err) 3115 return err; 3116 virtnet_set_queues(vi, vi->curr_queue_pairs); 3117 3118 err = virtnet_cpu_notif_add(vi); 3119 if (err) 3120 return err; 3121 3122 return 0; 3123 } 3124 3125 static struct virtio_device_id id_table[] = { 3126 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 3127 { 0 }, 3128 }; 3129 3130 #define VIRTNET_FEATURES \ 3131 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 3132 VIRTIO_NET_F_MAC, \ 3133 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 3134 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 3135 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 3136 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 3137 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 3138 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 3139 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 3140 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 3141 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY 3142 3143 static unsigned int features[] = { 3144 VIRTNET_FEATURES, 3145 }; 3146 3147 static unsigned int features_legacy[] = { 3148 VIRTNET_FEATURES, 3149 VIRTIO_NET_F_GSO, 3150 VIRTIO_F_ANY_LAYOUT, 3151 }; 3152 3153 static struct virtio_driver virtio_net_driver = { 3154 .feature_table = features, 3155 .feature_table_size = ARRAY_SIZE(features), 3156 .feature_table_legacy = features_legacy, 3157 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 3158 .driver.name = KBUILD_MODNAME, 3159 .driver.owner = THIS_MODULE, 3160 .id_table = id_table, 3161 .validate = virtnet_validate, 3162 .probe = virtnet_probe, 3163 .remove = virtnet_remove, 3164 .config_changed = virtnet_config_changed, 3165 #ifdef CONFIG_PM_SLEEP 3166 .freeze = virtnet_freeze, 3167 .restore = virtnet_restore, 3168 #endif 3169 }; 3170 3171 static __init int virtio_net_driver_init(void) 3172 { 3173 int ret; 3174 3175 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 3176 virtnet_cpu_online, 3177 virtnet_cpu_down_prep); 3178 if (ret < 0) 3179 goto out; 3180 virtionet_online = ret; 3181 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 3182 NULL, virtnet_cpu_dead); 3183 if (ret) 3184 goto err_dead; 3185 3186 ret = register_virtio_driver(&virtio_net_driver); 3187 if (ret) 3188 goto err_virtio; 3189 return 0; 3190 err_virtio: 3191 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 3192 err_dead: 3193 cpuhp_remove_multi_state(virtionet_online); 3194 out: 3195 return ret; 3196 } 3197 module_init(virtio_net_driver_init); 3198 3199 static __exit void virtio_net_driver_exit(void) 3200 { 3201 unregister_virtio_driver(&virtio_net_driver); 3202 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 3203 cpuhp_remove_multi_state(virtionet_online); 3204 } 3205 module_exit(virtio_net_driver_exit); 3206 3207 MODULE_DEVICE_TABLE(virtio, id_table); 3208 MODULE_DESCRIPTION("Virtio network driver"); 3209 MODULE_LICENSE("GPL"); 3210