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 VIRTIO_NET_F_GUEST_CSUM 75 }; 76 77 struct virtnet_stat_desc { 78 char desc[ETH_GSTRING_LEN]; 79 size_t offset; 80 }; 81 82 struct virtnet_sq_stats { 83 struct u64_stats_sync syncp; 84 u64 packets; 85 u64 bytes; 86 u64 xdp_tx; 87 u64 xdp_tx_drops; 88 u64 kicks; 89 }; 90 91 struct virtnet_rq_stats { 92 struct u64_stats_sync syncp; 93 u64 packets; 94 u64 bytes; 95 u64 drops; 96 u64 xdp_packets; 97 u64 xdp_tx; 98 u64 xdp_redirects; 99 u64 xdp_drops; 100 u64 kicks; 101 }; 102 103 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) 104 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) 105 106 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { 107 { "packets", VIRTNET_SQ_STAT(packets) }, 108 { "bytes", VIRTNET_SQ_STAT(bytes) }, 109 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, 110 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, 111 { "kicks", VIRTNET_SQ_STAT(kicks) }, 112 }; 113 114 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { 115 { "packets", VIRTNET_RQ_STAT(packets) }, 116 { "bytes", VIRTNET_RQ_STAT(bytes) }, 117 { "drops", VIRTNET_RQ_STAT(drops) }, 118 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, 119 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, 120 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, 121 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, 122 { "kicks", VIRTNET_RQ_STAT(kicks) }, 123 }; 124 125 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) 126 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) 127 128 /* Internal representation of a send virtqueue */ 129 struct send_queue { 130 /* Virtqueue associated with this send _queue */ 131 struct virtqueue *vq; 132 133 /* TX: fragments + linear part + virtio header */ 134 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 135 136 /* Name of the send queue: output.$index */ 137 char name[40]; 138 139 struct virtnet_sq_stats stats; 140 141 struct napi_struct napi; 142 }; 143 144 /* Internal representation of a receive virtqueue */ 145 struct receive_queue { 146 /* Virtqueue associated with this receive_queue */ 147 struct virtqueue *vq; 148 149 struct napi_struct napi; 150 151 struct bpf_prog __rcu *xdp_prog; 152 153 struct virtnet_rq_stats stats; 154 155 /* Chain pages by the private ptr. */ 156 struct page *pages; 157 158 /* Average packet length for mergeable receive buffers. */ 159 struct ewma_pkt_len mrg_avg_pkt_len; 160 161 /* Page frag for packet buffer allocation. */ 162 struct page_frag alloc_frag; 163 164 /* RX: fragments + linear part + virtio header */ 165 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 166 167 /* Min single buffer size for mergeable buffers case. */ 168 unsigned int min_buf_len; 169 170 /* Name of this receive queue: input.$index */ 171 char name[40]; 172 173 struct xdp_rxq_info xdp_rxq; 174 }; 175 176 /* Control VQ buffers: protected by the rtnl lock */ 177 struct control_buf { 178 struct virtio_net_ctrl_hdr hdr; 179 virtio_net_ctrl_ack status; 180 struct virtio_net_ctrl_mq mq; 181 u8 promisc; 182 u8 allmulti; 183 __virtio16 vid; 184 __virtio64 offloads; 185 }; 186 187 struct virtnet_info { 188 struct virtio_device *vdev; 189 struct virtqueue *cvq; 190 struct net_device *dev; 191 struct send_queue *sq; 192 struct receive_queue *rq; 193 unsigned int status; 194 195 /* Max # of queue pairs supported by the device */ 196 u16 max_queue_pairs; 197 198 /* # of queue pairs currently used by the driver */ 199 u16 curr_queue_pairs; 200 201 /* # of XDP queue pairs currently used by the driver */ 202 u16 xdp_queue_pairs; 203 204 /* I like... big packets and I cannot lie! */ 205 bool big_packets; 206 207 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 208 bool mergeable_rx_bufs; 209 210 /* Has control virtqueue */ 211 bool has_cvq; 212 213 /* Host can handle any s/g split between our header and packet data */ 214 bool any_header_sg; 215 216 /* Packet virtio header size */ 217 u8 hdr_len; 218 219 /* Work struct for refilling if we run low on memory. */ 220 struct delayed_work refill; 221 222 /* Work struct for config space updates */ 223 struct work_struct config_work; 224 225 /* Does the affinity hint is set for virtqueues? */ 226 bool affinity_hint_set; 227 228 /* CPU hotplug instances for online & dead */ 229 struct hlist_node node; 230 struct hlist_node node_dead; 231 232 struct control_buf *ctrl; 233 234 /* Ethtool settings */ 235 u8 duplex; 236 u32 speed; 237 238 unsigned long guest_offloads; 239 unsigned long guest_offloads_capable; 240 241 /* failover when STANDBY feature enabled */ 242 struct failover *failover; 243 }; 244 245 struct padded_vnet_hdr { 246 struct virtio_net_hdr_mrg_rxbuf hdr; 247 /* 248 * hdr is in a separate sg buffer, and data sg buffer shares same page 249 * with this header sg. This padding makes next sg 16 byte aligned 250 * after the header. 251 */ 252 char padding[4]; 253 }; 254 255 /* Converting between virtqueue no. and kernel tx/rx queue no. 256 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 257 */ 258 static int vq2txq(struct virtqueue *vq) 259 { 260 return (vq->index - 1) / 2; 261 } 262 263 static int txq2vq(int txq) 264 { 265 return txq * 2 + 1; 266 } 267 268 static int vq2rxq(struct virtqueue *vq) 269 { 270 return vq->index / 2; 271 } 272 273 static int rxq2vq(int rxq) 274 { 275 return rxq * 2; 276 } 277 278 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 279 { 280 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 281 } 282 283 /* 284 * private is used to chain pages for big packets, put the whole 285 * most recent used list in the beginning for reuse 286 */ 287 static void give_pages(struct receive_queue *rq, struct page *page) 288 { 289 struct page *end; 290 291 /* Find end of list, sew whole thing into vi->rq.pages. */ 292 for (end = page; end->private; end = (struct page *)end->private); 293 end->private = (unsigned long)rq->pages; 294 rq->pages = page; 295 } 296 297 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 298 { 299 struct page *p = rq->pages; 300 301 if (p) { 302 rq->pages = (struct page *)p->private; 303 /* clear private here, it is used to chain pages */ 304 p->private = 0; 305 } else 306 p = alloc_page(gfp_mask); 307 return p; 308 } 309 310 static void virtqueue_napi_schedule(struct napi_struct *napi, 311 struct virtqueue *vq) 312 { 313 if (napi_schedule_prep(napi)) { 314 virtqueue_disable_cb(vq); 315 __napi_schedule(napi); 316 } 317 } 318 319 static void virtqueue_napi_complete(struct napi_struct *napi, 320 struct virtqueue *vq, int processed) 321 { 322 int opaque; 323 324 opaque = virtqueue_enable_cb_prepare(vq); 325 if (napi_complete_done(napi, processed)) { 326 if (unlikely(virtqueue_poll(vq, opaque))) 327 virtqueue_napi_schedule(napi, vq); 328 } else { 329 virtqueue_disable_cb(vq); 330 } 331 } 332 333 static void skb_xmit_done(struct virtqueue *vq) 334 { 335 struct virtnet_info *vi = vq->vdev->priv; 336 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; 337 338 /* Suppress further interrupts. */ 339 virtqueue_disable_cb(vq); 340 341 if (napi->weight) 342 virtqueue_napi_schedule(napi, vq); 343 else 344 /* We were probably waiting for more output buffers. */ 345 netif_wake_subqueue(vi->dev, vq2txq(vq)); 346 } 347 348 #define MRG_CTX_HEADER_SHIFT 22 349 static void *mergeable_len_to_ctx(unsigned int truesize, 350 unsigned int headroom) 351 { 352 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); 353 } 354 355 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) 356 { 357 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; 358 } 359 360 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) 361 { 362 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); 363 } 364 365 /* Called from bottom half context */ 366 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 367 struct receive_queue *rq, 368 struct page *page, unsigned int offset, 369 unsigned int len, unsigned int truesize, 370 bool hdr_valid) 371 { 372 struct sk_buff *skb; 373 struct virtio_net_hdr_mrg_rxbuf *hdr; 374 unsigned int copy, hdr_len, hdr_padded_len; 375 char *p; 376 377 p = page_address(page) + offset; 378 379 /* copy small packet so we can reuse these pages for small data */ 380 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 381 if (unlikely(!skb)) 382 return NULL; 383 384 hdr = skb_vnet_hdr(skb); 385 386 hdr_len = vi->hdr_len; 387 if (vi->mergeable_rx_bufs) 388 hdr_padded_len = sizeof(*hdr); 389 else 390 hdr_padded_len = sizeof(struct padded_vnet_hdr); 391 392 if (hdr_valid) 393 memcpy(hdr, p, hdr_len); 394 395 len -= hdr_len; 396 offset += hdr_padded_len; 397 p += hdr_padded_len; 398 399 copy = len; 400 if (copy > skb_tailroom(skb)) 401 copy = skb_tailroom(skb); 402 skb_put_data(skb, p, copy); 403 404 len -= copy; 405 offset += copy; 406 407 if (vi->mergeable_rx_bufs) { 408 if (len) 409 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 410 else 411 put_page(page); 412 return skb; 413 } 414 415 /* 416 * Verify that we can indeed put this data into a skb. 417 * This is here to handle cases when the device erroneously 418 * tries to receive more than is possible. This is usually 419 * the case of a broken device. 420 */ 421 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 422 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 423 dev_kfree_skb(skb); 424 return NULL; 425 } 426 BUG_ON(offset >= PAGE_SIZE); 427 while (len) { 428 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 429 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 430 frag_size, truesize); 431 len -= frag_size; 432 page = (struct page *)page->private; 433 offset = 0; 434 } 435 436 if (page) 437 give_pages(rq, page); 438 439 return skb; 440 } 441 442 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, 443 struct send_queue *sq, 444 struct xdp_frame *xdpf) 445 { 446 struct virtio_net_hdr_mrg_rxbuf *hdr; 447 int err; 448 449 /* virtqueue want to use data area in-front of packet */ 450 if (unlikely(xdpf->metasize > 0)) 451 return -EOPNOTSUPP; 452 453 if (unlikely(xdpf->headroom < vi->hdr_len)) 454 return -EOVERFLOW; 455 456 /* Make room for virtqueue hdr (also change xdpf->headroom?) */ 457 xdpf->data -= vi->hdr_len; 458 /* Zero header and leave csum up to XDP layers */ 459 hdr = xdpf->data; 460 memset(hdr, 0, vi->hdr_len); 461 xdpf->len += vi->hdr_len; 462 463 sg_init_one(sq->sg, xdpf->data, xdpf->len); 464 465 err = virtqueue_add_outbuf(sq->vq, sq->sg, 1, xdpf, GFP_ATOMIC); 466 if (unlikely(err)) 467 return -ENOSPC; /* Caller handle free/refcnt */ 468 469 return 0; 470 } 471 472 static struct send_queue *virtnet_xdp_sq(struct virtnet_info *vi) 473 { 474 unsigned int qp; 475 476 qp = vi->curr_queue_pairs - vi->xdp_queue_pairs + smp_processor_id(); 477 return &vi->sq[qp]; 478 } 479 480 static int virtnet_xdp_xmit(struct net_device *dev, 481 int n, struct xdp_frame **frames, u32 flags) 482 { 483 struct virtnet_info *vi = netdev_priv(dev); 484 struct receive_queue *rq = vi->rq; 485 struct xdp_frame *xdpf_sent; 486 struct bpf_prog *xdp_prog; 487 struct send_queue *sq; 488 unsigned int len; 489 int drops = 0; 490 int kicks = 0; 491 int ret, err; 492 int i; 493 494 sq = virtnet_xdp_sq(vi); 495 496 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { 497 ret = -EINVAL; 498 drops = n; 499 goto out; 500 } 501 502 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this 503 * indicate XDP resources have been successfully allocated. 504 */ 505 xdp_prog = rcu_dereference(rq->xdp_prog); 506 if (!xdp_prog) { 507 ret = -ENXIO; 508 drops = n; 509 goto out; 510 } 511 512 /* Free up any pending old buffers before queueing new ones. */ 513 while ((xdpf_sent = virtqueue_get_buf(sq->vq, &len)) != NULL) 514 xdp_return_frame(xdpf_sent); 515 516 for (i = 0; i < n; i++) { 517 struct xdp_frame *xdpf = frames[i]; 518 519 err = __virtnet_xdp_xmit_one(vi, sq, xdpf); 520 if (err) { 521 xdp_return_frame_rx_napi(xdpf); 522 drops++; 523 } 524 } 525 ret = n - drops; 526 527 if (flags & XDP_XMIT_FLUSH) { 528 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 529 kicks = 1; 530 } 531 out: 532 u64_stats_update_begin(&sq->stats.syncp); 533 sq->stats.xdp_tx += n; 534 sq->stats.xdp_tx_drops += drops; 535 sq->stats.kicks += kicks; 536 u64_stats_update_end(&sq->stats.syncp); 537 538 return ret; 539 } 540 541 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 542 { 543 return vi->xdp_queue_pairs ? VIRTIO_XDP_HEADROOM : 0; 544 } 545 546 /* We copy the packet for XDP in the following cases: 547 * 548 * 1) Packet is scattered across multiple rx buffers. 549 * 2) Headroom space is insufficient. 550 * 551 * This is inefficient but it's a temporary condition that 552 * we hit right after XDP is enabled and until queue is refilled 553 * with large buffers with sufficient headroom - so it should affect 554 * at most queue size packets. 555 * Afterwards, the conditions to enable 556 * XDP should preclude the underlying device from sending packets 557 * across multiple buffers (num_buf > 1), and we make sure buffers 558 * have enough headroom. 559 */ 560 static struct page *xdp_linearize_page(struct receive_queue *rq, 561 u16 *num_buf, 562 struct page *p, 563 int offset, 564 int page_off, 565 unsigned int *len) 566 { 567 struct page *page = alloc_page(GFP_ATOMIC); 568 569 if (!page) 570 return NULL; 571 572 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 573 page_off += *len; 574 575 while (--*num_buf) { 576 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 577 unsigned int buflen; 578 void *buf; 579 int off; 580 581 buf = virtqueue_get_buf(rq->vq, &buflen); 582 if (unlikely(!buf)) 583 goto err_buf; 584 585 p = virt_to_head_page(buf); 586 off = buf - page_address(p); 587 588 /* guard against a misconfigured or uncooperative backend that 589 * is sending packet larger than the MTU. 590 */ 591 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 592 put_page(p); 593 goto err_buf; 594 } 595 596 memcpy(page_address(page) + page_off, 597 page_address(p) + off, buflen); 598 page_off += buflen; 599 put_page(p); 600 } 601 602 /* Headroom does not contribute to packet length */ 603 *len = page_off - VIRTIO_XDP_HEADROOM; 604 return page; 605 err_buf: 606 __free_pages(page, 0); 607 return NULL; 608 } 609 610 static struct sk_buff *receive_small(struct net_device *dev, 611 struct virtnet_info *vi, 612 struct receive_queue *rq, 613 void *buf, void *ctx, 614 unsigned int len, 615 unsigned int *xdp_xmit, 616 struct virtnet_rq_stats *stats) 617 { 618 struct sk_buff *skb; 619 struct bpf_prog *xdp_prog; 620 unsigned int xdp_headroom = (unsigned long)ctx; 621 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 622 unsigned int headroom = vi->hdr_len + header_offset; 623 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 624 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 625 struct page *page = virt_to_head_page(buf); 626 unsigned int delta = 0; 627 struct page *xdp_page; 628 int err; 629 630 len -= vi->hdr_len; 631 stats->bytes += len; 632 633 rcu_read_lock(); 634 xdp_prog = rcu_dereference(rq->xdp_prog); 635 if (xdp_prog) { 636 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 637 struct xdp_frame *xdpf; 638 struct xdp_buff xdp; 639 void *orig_data; 640 u32 act; 641 642 if (unlikely(hdr->hdr.gso_type)) 643 goto err_xdp; 644 645 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 646 int offset = buf - page_address(page) + header_offset; 647 unsigned int tlen = len + vi->hdr_len; 648 u16 num_buf = 1; 649 650 xdp_headroom = virtnet_get_headroom(vi); 651 header_offset = VIRTNET_RX_PAD + xdp_headroom; 652 headroom = vi->hdr_len + header_offset; 653 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 654 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 655 xdp_page = xdp_linearize_page(rq, &num_buf, page, 656 offset, header_offset, 657 &tlen); 658 if (!xdp_page) 659 goto err_xdp; 660 661 buf = page_address(xdp_page); 662 put_page(page); 663 page = xdp_page; 664 } 665 666 xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len; 667 xdp.data = xdp.data_hard_start + xdp_headroom; 668 xdp_set_data_meta_invalid(&xdp); 669 xdp.data_end = xdp.data + len; 670 xdp.rxq = &rq->xdp_rxq; 671 orig_data = xdp.data; 672 act = bpf_prog_run_xdp(xdp_prog, &xdp); 673 stats->xdp_packets++; 674 675 switch (act) { 676 case XDP_PASS: 677 /* Recalculate length in case bpf program changed it */ 678 delta = orig_data - xdp.data; 679 len = xdp.data_end - xdp.data; 680 break; 681 case XDP_TX: 682 stats->xdp_tx++; 683 xdpf = convert_to_xdp_frame(&xdp); 684 if (unlikely(!xdpf)) 685 goto err_xdp; 686 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 687 if (unlikely(err < 0)) { 688 trace_xdp_exception(vi->dev, xdp_prog, act); 689 goto err_xdp; 690 } 691 *xdp_xmit |= VIRTIO_XDP_TX; 692 rcu_read_unlock(); 693 goto xdp_xmit; 694 case XDP_REDIRECT: 695 stats->xdp_redirects++; 696 err = xdp_do_redirect(dev, &xdp, xdp_prog); 697 if (err) 698 goto err_xdp; 699 *xdp_xmit |= VIRTIO_XDP_REDIR; 700 rcu_read_unlock(); 701 goto xdp_xmit; 702 default: 703 bpf_warn_invalid_xdp_action(act); 704 /* fall through */ 705 case XDP_ABORTED: 706 trace_xdp_exception(vi->dev, xdp_prog, act); 707 case XDP_DROP: 708 goto err_xdp; 709 } 710 } 711 rcu_read_unlock(); 712 713 skb = build_skb(buf, buflen); 714 if (!skb) { 715 put_page(page); 716 goto err; 717 } 718 skb_reserve(skb, headroom - delta); 719 skb_put(skb, len); 720 if (!delta) { 721 buf += header_offset; 722 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 723 } /* keep zeroed vnet hdr since packet was changed by bpf */ 724 725 err: 726 return skb; 727 728 err_xdp: 729 rcu_read_unlock(); 730 stats->xdp_drops++; 731 stats->drops++; 732 put_page(page); 733 xdp_xmit: 734 return NULL; 735 } 736 737 static struct sk_buff *receive_big(struct net_device *dev, 738 struct virtnet_info *vi, 739 struct receive_queue *rq, 740 void *buf, 741 unsigned int len, 742 struct virtnet_rq_stats *stats) 743 { 744 struct page *page = buf; 745 struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len, 746 PAGE_SIZE, true); 747 748 stats->bytes += len - vi->hdr_len; 749 if (unlikely(!skb)) 750 goto err; 751 752 return skb; 753 754 err: 755 stats->drops++; 756 give_pages(rq, page); 757 return NULL; 758 } 759 760 static struct sk_buff *receive_mergeable(struct net_device *dev, 761 struct virtnet_info *vi, 762 struct receive_queue *rq, 763 void *buf, 764 void *ctx, 765 unsigned int len, 766 unsigned int *xdp_xmit, 767 struct virtnet_rq_stats *stats) 768 { 769 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 770 u16 num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 771 struct page *page = virt_to_head_page(buf); 772 int offset = buf - page_address(page); 773 struct sk_buff *head_skb, *curr_skb; 774 struct bpf_prog *xdp_prog; 775 unsigned int truesize; 776 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 777 int err; 778 779 head_skb = NULL; 780 stats->bytes += len - vi->hdr_len; 781 782 rcu_read_lock(); 783 xdp_prog = rcu_dereference(rq->xdp_prog); 784 if (xdp_prog) { 785 struct xdp_frame *xdpf; 786 struct page *xdp_page; 787 struct xdp_buff xdp; 788 void *data; 789 u32 act; 790 791 /* Transient failure which in theory could occur if 792 * in-flight packets from before XDP was enabled reach 793 * the receive path after XDP is loaded. 794 */ 795 if (unlikely(hdr->hdr.gso_type)) 796 goto err_xdp; 797 798 /* This happens when rx buffer size is underestimated 799 * or headroom is not enough because of the buffer 800 * was refilled before XDP is set. This should only 801 * happen for the first several packets, so we don't 802 * care much about its performance. 803 */ 804 if (unlikely(num_buf > 1 || 805 headroom < virtnet_get_headroom(vi))) { 806 /* linearize data for XDP */ 807 xdp_page = xdp_linearize_page(rq, &num_buf, 808 page, offset, 809 VIRTIO_XDP_HEADROOM, 810 &len); 811 if (!xdp_page) 812 goto err_xdp; 813 offset = VIRTIO_XDP_HEADROOM; 814 } else { 815 xdp_page = page; 816 } 817 818 /* Allow consuming headroom but reserve enough space to push 819 * the descriptor on if we get an XDP_TX return code. 820 */ 821 data = page_address(xdp_page) + offset; 822 xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len; 823 xdp.data = data + vi->hdr_len; 824 xdp_set_data_meta_invalid(&xdp); 825 xdp.data_end = xdp.data + (len - vi->hdr_len); 826 xdp.rxq = &rq->xdp_rxq; 827 828 act = bpf_prog_run_xdp(xdp_prog, &xdp); 829 stats->xdp_packets++; 830 831 switch (act) { 832 case XDP_PASS: 833 /* recalculate offset to account for any header 834 * adjustments. Note other cases do not build an 835 * skb and avoid using offset 836 */ 837 offset = xdp.data - 838 page_address(xdp_page) - vi->hdr_len; 839 840 /* recalculate len if xdp.data or xdp.data_end were 841 * adjusted 842 */ 843 len = xdp.data_end - xdp.data + vi->hdr_len; 844 /* We can only create skb based on xdp_page. */ 845 if (unlikely(xdp_page != page)) { 846 rcu_read_unlock(); 847 put_page(page); 848 head_skb = page_to_skb(vi, rq, xdp_page, 849 offset, len, 850 PAGE_SIZE, false); 851 return head_skb; 852 } 853 break; 854 case XDP_TX: 855 stats->xdp_tx++; 856 xdpf = convert_to_xdp_frame(&xdp); 857 if (unlikely(!xdpf)) 858 goto err_xdp; 859 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 860 if (unlikely(err < 0)) { 861 trace_xdp_exception(vi->dev, xdp_prog, act); 862 if (unlikely(xdp_page != page)) 863 put_page(xdp_page); 864 goto err_xdp; 865 } 866 *xdp_xmit |= VIRTIO_XDP_TX; 867 if (unlikely(xdp_page != page)) 868 put_page(page); 869 rcu_read_unlock(); 870 goto xdp_xmit; 871 case XDP_REDIRECT: 872 stats->xdp_redirects++; 873 err = xdp_do_redirect(dev, &xdp, xdp_prog); 874 if (err) { 875 if (unlikely(xdp_page != page)) 876 put_page(xdp_page); 877 goto err_xdp; 878 } 879 *xdp_xmit |= VIRTIO_XDP_REDIR; 880 if (unlikely(xdp_page != page)) 881 put_page(page); 882 rcu_read_unlock(); 883 goto xdp_xmit; 884 default: 885 bpf_warn_invalid_xdp_action(act); 886 /* fall through */ 887 case XDP_ABORTED: 888 trace_xdp_exception(vi->dev, xdp_prog, act); 889 /* fall through */ 890 case XDP_DROP: 891 if (unlikely(xdp_page != page)) 892 __free_pages(xdp_page, 0); 893 goto err_xdp; 894 } 895 } 896 rcu_read_unlock(); 897 898 truesize = mergeable_ctx_to_truesize(ctx); 899 if (unlikely(len > truesize)) { 900 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 901 dev->name, len, (unsigned long)ctx); 902 dev->stats.rx_length_errors++; 903 goto err_skb; 904 } 905 906 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog); 907 curr_skb = head_skb; 908 909 if (unlikely(!curr_skb)) 910 goto err_skb; 911 while (--num_buf) { 912 int num_skb_frags; 913 914 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 915 if (unlikely(!buf)) { 916 pr_debug("%s: rx error: %d buffers out of %d missing\n", 917 dev->name, num_buf, 918 virtio16_to_cpu(vi->vdev, 919 hdr->num_buffers)); 920 dev->stats.rx_length_errors++; 921 goto err_buf; 922 } 923 924 stats->bytes += len; 925 page = virt_to_head_page(buf); 926 927 truesize = mergeable_ctx_to_truesize(ctx); 928 if (unlikely(len > truesize)) { 929 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 930 dev->name, len, (unsigned long)ctx); 931 dev->stats.rx_length_errors++; 932 goto err_skb; 933 } 934 935 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 936 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 937 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 938 939 if (unlikely(!nskb)) 940 goto err_skb; 941 if (curr_skb == head_skb) 942 skb_shinfo(curr_skb)->frag_list = nskb; 943 else 944 curr_skb->next = nskb; 945 curr_skb = nskb; 946 head_skb->truesize += nskb->truesize; 947 num_skb_frags = 0; 948 } 949 if (curr_skb != head_skb) { 950 head_skb->data_len += len; 951 head_skb->len += len; 952 head_skb->truesize += truesize; 953 } 954 offset = buf - page_address(page); 955 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 956 put_page(page); 957 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 958 len, truesize); 959 } else { 960 skb_add_rx_frag(curr_skb, num_skb_frags, page, 961 offset, len, truesize); 962 } 963 } 964 965 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 966 return head_skb; 967 968 err_xdp: 969 rcu_read_unlock(); 970 stats->xdp_drops++; 971 err_skb: 972 put_page(page); 973 while (num_buf-- > 1) { 974 buf = virtqueue_get_buf(rq->vq, &len); 975 if (unlikely(!buf)) { 976 pr_debug("%s: rx error: %d buffers missing\n", 977 dev->name, num_buf); 978 dev->stats.rx_length_errors++; 979 break; 980 } 981 stats->bytes += len; 982 page = virt_to_head_page(buf); 983 put_page(page); 984 } 985 err_buf: 986 stats->drops++; 987 dev_kfree_skb(head_skb); 988 xdp_xmit: 989 return NULL; 990 } 991 992 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 993 void *buf, unsigned int len, void **ctx, 994 unsigned int *xdp_xmit, 995 struct virtnet_rq_stats *stats) 996 { 997 struct net_device *dev = vi->dev; 998 struct sk_buff *skb; 999 struct virtio_net_hdr_mrg_rxbuf *hdr; 1000 1001 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1002 pr_debug("%s: short packet %i\n", dev->name, len); 1003 dev->stats.rx_length_errors++; 1004 if (vi->mergeable_rx_bufs) { 1005 put_page(virt_to_head_page(buf)); 1006 } else if (vi->big_packets) { 1007 give_pages(rq, buf); 1008 } else { 1009 put_page(virt_to_head_page(buf)); 1010 } 1011 return; 1012 } 1013 1014 if (vi->mergeable_rx_bufs) 1015 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1016 stats); 1017 else if (vi->big_packets) 1018 skb = receive_big(dev, vi, rq, buf, len, stats); 1019 else 1020 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1021 1022 if (unlikely(!skb)) 1023 return; 1024 1025 hdr = skb_vnet_hdr(skb); 1026 1027 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1028 skb->ip_summed = CHECKSUM_UNNECESSARY; 1029 1030 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1031 virtio_is_little_endian(vi->vdev))) { 1032 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1033 dev->name, hdr->hdr.gso_type, 1034 hdr->hdr.gso_size); 1035 goto frame_err; 1036 } 1037 1038 skb->protocol = eth_type_trans(skb, dev); 1039 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1040 ntohs(skb->protocol), skb->len, skb->pkt_type); 1041 1042 napi_gro_receive(&rq->napi, skb); 1043 return; 1044 1045 frame_err: 1046 dev->stats.rx_frame_errors++; 1047 dev_kfree_skb(skb); 1048 } 1049 1050 /* Unlike mergeable buffers, all buffers are allocated to the 1051 * same size, except for the headroom. For this reason we do 1052 * not need to use mergeable_len_to_ctx here - it is enough 1053 * to store the headroom as the context ignoring the truesize. 1054 */ 1055 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1056 gfp_t gfp) 1057 { 1058 struct page_frag *alloc_frag = &rq->alloc_frag; 1059 char *buf; 1060 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1061 void *ctx = (void *)(unsigned long)xdp_headroom; 1062 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1063 int err; 1064 1065 len = SKB_DATA_ALIGN(len) + 1066 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1067 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1068 return -ENOMEM; 1069 1070 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1071 get_page(alloc_frag->page); 1072 alloc_frag->offset += len; 1073 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1074 vi->hdr_len + GOOD_PACKET_LEN); 1075 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1076 if (err < 0) 1077 put_page(virt_to_head_page(buf)); 1078 return err; 1079 } 1080 1081 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1082 gfp_t gfp) 1083 { 1084 struct page *first, *list = NULL; 1085 char *p; 1086 int i, err, offset; 1087 1088 sg_init_table(rq->sg, MAX_SKB_FRAGS + 2); 1089 1090 /* page in rq->sg[MAX_SKB_FRAGS + 1] is list tail */ 1091 for (i = MAX_SKB_FRAGS + 1; i > 1; --i) { 1092 first = get_a_page(rq, gfp); 1093 if (!first) { 1094 if (list) 1095 give_pages(rq, list); 1096 return -ENOMEM; 1097 } 1098 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1099 1100 /* chain new page in list head to match sg */ 1101 first->private = (unsigned long)list; 1102 list = first; 1103 } 1104 1105 first = get_a_page(rq, gfp); 1106 if (!first) { 1107 give_pages(rq, list); 1108 return -ENOMEM; 1109 } 1110 p = page_address(first); 1111 1112 /* rq->sg[0], rq->sg[1] share the same page */ 1113 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1114 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1115 1116 /* rq->sg[1] for data packet, from offset */ 1117 offset = sizeof(struct padded_vnet_hdr); 1118 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1119 1120 /* chain first in list head */ 1121 first->private = (unsigned long)list; 1122 err = virtqueue_add_inbuf(rq->vq, rq->sg, MAX_SKB_FRAGS + 2, 1123 first, gfp); 1124 if (err < 0) 1125 give_pages(rq, first); 1126 1127 return err; 1128 } 1129 1130 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1131 struct ewma_pkt_len *avg_pkt_len, 1132 unsigned int room) 1133 { 1134 const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 1135 unsigned int len; 1136 1137 if (room) 1138 return PAGE_SIZE - room; 1139 1140 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1141 rq->min_buf_len, PAGE_SIZE - hdr_len); 1142 1143 return ALIGN(len, L1_CACHE_BYTES); 1144 } 1145 1146 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1147 struct receive_queue *rq, gfp_t gfp) 1148 { 1149 struct page_frag *alloc_frag = &rq->alloc_frag; 1150 unsigned int headroom = virtnet_get_headroom(vi); 1151 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1152 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1153 char *buf; 1154 void *ctx; 1155 int err; 1156 unsigned int len, hole; 1157 1158 /* Extra tailroom is needed to satisfy XDP's assumption. This 1159 * means rx frags coalescing won't work, but consider we've 1160 * disabled GSO for XDP, it won't be a big issue. 1161 */ 1162 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1163 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1164 return -ENOMEM; 1165 1166 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1167 buf += headroom; /* advance address leaving hole at front of pkt */ 1168 get_page(alloc_frag->page); 1169 alloc_frag->offset += len + room; 1170 hole = alloc_frag->size - alloc_frag->offset; 1171 if (hole < len + room) { 1172 /* To avoid internal fragmentation, if there is very likely not 1173 * enough space for another buffer, add the remaining space to 1174 * the current buffer. 1175 */ 1176 len += hole; 1177 alloc_frag->offset += hole; 1178 } 1179 1180 sg_init_one(rq->sg, buf, len); 1181 ctx = mergeable_len_to_ctx(len, headroom); 1182 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1183 if (err < 0) 1184 put_page(virt_to_head_page(buf)); 1185 1186 return err; 1187 } 1188 1189 /* 1190 * Returns false if we couldn't fill entirely (OOM). 1191 * 1192 * Normally run in the receive path, but can also be run from ndo_open 1193 * before we're receiving packets, or from refill_work which is 1194 * careful to disable receiving (using napi_disable). 1195 */ 1196 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1197 gfp_t gfp) 1198 { 1199 int err; 1200 bool oom; 1201 1202 do { 1203 if (vi->mergeable_rx_bufs) 1204 err = add_recvbuf_mergeable(vi, rq, gfp); 1205 else if (vi->big_packets) 1206 err = add_recvbuf_big(vi, rq, gfp); 1207 else 1208 err = add_recvbuf_small(vi, rq, gfp); 1209 1210 oom = err == -ENOMEM; 1211 if (err) 1212 break; 1213 } while (rq->vq->num_free); 1214 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1215 u64_stats_update_begin(&rq->stats.syncp); 1216 rq->stats.kicks++; 1217 u64_stats_update_end(&rq->stats.syncp); 1218 } 1219 1220 return !oom; 1221 } 1222 1223 static void skb_recv_done(struct virtqueue *rvq) 1224 { 1225 struct virtnet_info *vi = rvq->vdev->priv; 1226 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1227 1228 virtqueue_napi_schedule(&rq->napi, rvq); 1229 } 1230 1231 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1232 { 1233 napi_enable(napi); 1234 1235 /* If all buffers were filled by other side before we napi_enabled, we 1236 * won't get another interrupt, so process any outstanding packets now. 1237 * Call local_bh_enable after to trigger softIRQ processing. 1238 */ 1239 local_bh_disable(); 1240 virtqueue_napi_schedule(napi, vq); 1241 local_bh_enable(); 1242 } 1243 1244 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1245 struct virtqueue *vq, 1246 struct napi_struct *napi) 1247 { 1248 if (!napi->weight) 1249 return; 1250 1251 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1252 * enable the feature if this is likely affine with the transmit path. 1253 */ 1254 if (!vi->affinity_hint_set) { 1255 napi->weight = 0; 1256 return; 1257 } 1258 1259 return virtnet_napi_enable(vq, napi); 1260 } 1261 1262 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1263 { 1264 if (napi->weight) 1265 napi_disable(napi); 1266 } 1267 1268 static void refill_work(struct work_struct *work) 1269 { 1270 struct virtnet_info *vi = 1271 container_of(work, struct virtnet_info, refill.work); 1272 bool still_empty; 1273 int i; 1274 1275 for (i = 0; i < vi->curr_queue_pairs; i++) { 1276 struct receive_queue *rq = &vi->rq[i]; 1277 1278 napi_disable(&rq->napi); 1279 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1280 virtnet_napi_enable(rq->vq, &rq->napi); 1281 1282 /* In theory, this can happen: if we don't get any buffers in 1283 * we will *never* try to fill again. 1284 */ 1285 if (still_empty) 1286 schedule_delayed_work(&vi->refill, HZ/2); 1287 } 1288 } 1289 1290 static int virtnet_receive(struct receive_queue *rq, int budget, 1291 unsigned int *xdp_xmit) 1292 { 1293 struct virtnet_info *vi = rq->vq->vdev->priv; 1294 struct virtnet_rq_stats stats = {}; 1295 unsigned int len; 1296 void *buf; 1297 int i; 1298 1299 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1300 void *ctx; 1301 1302 while (stats.packets < budget && 1303 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1304 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1305 stats.packets++; 1306 } 1307 } else { 1308 while (stats.packets < budget && 1309 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1310 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1311 stats.packets++; 1312 } 1313 } 1314 1315 if (rq->vq->num_free > virtqueue_get_vring_size(rq->vq) / 2) { 1316 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) 1317 schedule_delayed_work(&vi->refill, 0); 1318 } 1319 1320 u64_stats_update_begin(&rq->stats.syncp); 1321 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1322 size_t offset = virtnet_rq_stats_desc[i].offset; 1323 u64 *item; 1324 1325 item = (u64 *)((u8 *)&rq->stats + offset); 1326 *item += *(u64 *)((u8 *)&stats + offset); 1327 } 1328 u64_stats_update_end(&rq->stats.syncp); 1329 1330 return stats.packets; 1331 } 1332 1333 static void free_old_xmit_skbs(struct send_queue *sq) 1334 { 1335 struct sk_buff *skb; 1336 unsigned int len; 1337 unsigned int packets = 0; 1338 unsigned int bytes = 0; 1339 1340 while ((skb = virtqueue_get_buf(sq->vq, &len)) != NULL) { 1341 pr_debug("Sent skb %p\n", skb); 1342 1343 bytes += skb->len; 1344 packets++; 1345 1346 dev_consume_skb_any(skb); 1347 } 1348 1349 /* Avoid overhead when no packets have been processed 1350 * happens when called speculatively from start_xmit. 1351 */ 1352 if (!packets) 1353 return; 1354 1355 u64_stats_update_begin(&sq->stats.syncp); 1356 sq->stats.bytes += bytes; 1357 sq->stats.packets += packets; 1358 u64_stats_update_end(&sq->stats.syncp); 1359 } 1360 1361 static void virtnet_poll_cleantx(struct receive_queue *rq) 1362 { 1363 struct virtnet_info *vi = rq->vq->vdev->priv; 1364 unsigned int index = vq2rxq(rq->vq); 1365 struct send_queue *sq = &vi->sq[index]; 1366 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1367 1368 if (!sq->napi.weight) 1369 return; 1370 1371 if (__netif_tx_trylock(txq)) { 1372 free_old_xmit_skbs(sq); 1373 __netif_tx_unlock(txq); 1374 } 1375 1376 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1377 netif_tx_wake_queue(txq); 1378 } 1379 1380 static int virtnet_poll(struct napi_struct *napi, int budget) 1381 { 1382 struct receive_queue *rq = 1383 container_of(napi, struct receive_queue, napi); 1384 struct virtnet_info *vi = rq->vq->vdev->priv; 1385 struct send_queue *sq; 1386 unsigned int received; 1387 unsigned int xdp_xmit = 0; 1388 1389 virtnet_poll_cleantx(rq); 1390 1391 received = virtnet_receive(rq, budget, &xdp_xmit); 1392 1393 /* Out of packets? */ 1394 if (received < budget) 1395 virtqueue_napi_complete(napi, rq->vq, received); 1396 1397 if (xdp_xmit & VIRTIO_XDP_REDIR) 1398 xdp_do_flush_map(); 1399 1400 if (xdp_xmit & VIRTIO_XDP_TX) { 1401 sq = virtnet_xdp_sq(vi); 1402 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1403 u64_stats_update_begin(&sq->stats.syncp); 1404 sq->stats.kicks++; 1405 u64_stats_update_end(&sq->stats.syncp); 1406 } 1407 } 1408 1409 return received; 1410 } 1411 1412 static int virtnet_open(struct net_device *dev) 1413 { 1414 struct virtnet_info *vi = netdev_priv(dev); 1415 int i, err; 1416 1417 for (i = 0; i < vi->max_queue_pairs; i++) { 1418 if (i < vi->curr_queue_pairs) 1419 /* Make sure we have some buffers: if oom use wq. */ 1420 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1421 schedule_delayed_work(&vi->refill, 0); 1422 1423 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i); 1424 if (err < 0) 1425 return err; 1426 1427 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, 1428 MEM_TYPE_PAGE_SHARED, NULL); 1429 if (err < 0) { 1430 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1431 return err; 1432 } 1433 1434 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 1435 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); 1436 } 1437 1438 return 0; 1439 } 1440 1441 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1442 { 1443 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1444 struct virtnet_info *vi = sq->vq->vdev->priv; 1445 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, vq2txq(sq->vq)); 1446 1447 __netif_tx_lock(txq, raw_smp_processor_id()); 1448 free_old_xmit_skbs(sq); 1449 __netif_tx_unlock(txq); 1450 1451 virtqueue_napi_complete(napi, sq->vq, 0); 1452 1453 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1454 netif_tx_wake_queue(txq); 1455 1456 return 0; 1457 } 1458 1459 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1460 { 1461 struct virtio_net_hdr_mrg_rxbuf *hdr; 1462 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1463 struct virtnet_info *vi = sq->vq->vdev->priv; 1464 int num_sg; 1465 unsigned hdr_len = vi->hdr_len; 1466 bool can_push; 1467 1468 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1469 1470 can_push = vi->any_header_sg && 1471 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1472 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1473 /* Even if we can, don't push here yet as this would skew 1474 * csum_start offset below. */ 1475 if (can_push) 1476 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 1477 else 1478 hdr = skb_vnet_hdr(skb); 1479 1480 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 1481 virtio_is_little_endian(vi->vdev), false, 1482 0)) 1483 BUG(); 1484 1485 if (vi->mergeable_rx_bufs) 1486 hdr->num_buffers = 0; 1487 1488 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 1489 if (can_push) { 1490 __skb_push(skb, hdr_len); 1491 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 1492 if (unlikely(num_sg < 0)) 1493 return num_sg; 1494 /* Pull header back to avoid skew in tx bytes calculations. */ 1495 __skb_pull(skb, hdr_len); 1496 } else { 1497 sg_set_buf(sq->sg, hdr, hdr_len); 1498 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 1499 if (unlikely(num_sg < 0)) 1500 return num_sg; 1501 num_sg++; 1502 } 1503 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 1504 } 1505 1506 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 1507 { 1508 struct virtnet_info *vi = netdev_priv(dev); 1509 int qnum = skb_get_queue_mapping(skb); 1510 struct send_queue *sq = &vi->sq[qnum]; 1511 int err; 1512 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 1513 bool kick = !skb->xmit_more; 1514 bool use_napi = sq->napi.weight; 1515 1516 /* Free up any pending old buffers before queueing new ones. */ 1517 free_old_xmit_skbs(sq); 1518 1519 if (use_napi && kick) 1520 virtqueue_enable_cb_delayed(sq->vq); 1521 1522 /* timestamp packet in software */ 1523 skb_tx_timestamp(skb); 1524 1525 /* Try to transmit */ 1526 err = xmit_skb(sq, skb); 1527 1528 /* This should not happen! */ 1529 if (unlikely(err)) { 1530 dev->stats.tx_fifo_errors++; 1531 if (net_ratelimit()) 1532 dev_warn(&dev->dev, 1533 "Unexpected TXQ (%d) queue failure: %d\n", qnum, err); 1534 dev->stats.tx_dropped++; 1535 dev_kfree_skb_any(skb); 1536 return NETDEV_TX_OK; 1537 } 1538 1539 /* Don't wait up for transmitted skbs to be freed. */ 1540 if (!use_napi) { 1541 skb_orphan(skb); 1542 nf_reset(skb); 1543 } 1544 1545 /* If running out of space, stop queue to avoid getting packets that we 1546 * are then unable to transmit. 1547 * An alternative would be to force queuing layer to requeue the skb by 1548 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 1549 * returned in a normal path of operation: it means that driver is not 1550 * maintaining the TX queue stop/start state properly, and causes 1551 * the stack to do a non-trivial amount of useless work. 1552 * Since most packets only take 1 or 2 ring slots, stopping the queue 1553 * early means 16 slots are typically wasted. 1554 */ 1555 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 1556 netif_stop_subqueue(dev, qnum); 1557 if (!use_napi && 1558 unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 1559 /* More just got used, free them then recheck. */ 1560 free_old_xmit_skbs(sq); 1561 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 1562 netif_start_subqueue(dev, qnum); 1563 virtqueue_disable_cb(sq->vq); 1564 } 1565 } 1566 } 1567 1568 if (kick || netif_xmit_stopped(txq)) { 1569 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1570 u64_stats_update_begin(&sq->stats.syncp); 1571 sq->stats.kicks++; 1572 u64_stats_update_end(&sq->stats.syncp); 1573 } 1574 } 1575 1576 return NETDEV_TX_OK; 1577 } 1578 1579 /* 1580 * Send command via the control virtqueue and check status. Commands 1581 * supported by the hypervisor, as indicated by feature bits, should 1582 * never fail unless improperly formatted. 1583 */ 1584 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 1585 struct scatterlist *out) 1586 { 1587 struct scatterlist *sgs[4], hdr, stat; 1588 unsigned out_num = 0, tmp; 1589 1590 /* Caller should know better */ 1591 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 1592 1593 vi->ctrl->status = ~0; 1594 vi->ctrl->hdr.class = class; 1595 vi->ctrl->hdr.cmd = cmd; 1596 /* Add header */ 1597 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 1598 sgs[out_num++] = &hdr; 1599 1600 if (out) 1601 sgs[out_num++] = out; 1602 1603 /* Add return status. */ 1604 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 1605 sgs[out_num] = &stat; 1606 1607 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 1608 virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 1609 1610 if (unlikely(!virtqueue_kick(vi->cvq))) 1611 return vi->ctrl->status == VIRTIO_NET_OK; 1612 1613 /* Spin for a response, the kick causes an ioport write, trapping 1614 * into the hypervisor, so the request should be handled immediately. 1615 */ 1616 while (!virtqueue_get_buf(vi->cvq, &tmp) && 1617 !virtqueue_is_broken(vi->cvq)) 1618 cpu_relax(); 1619 1620 return vi->ctrl->status == VIRTIO_NET_OK; 1621 } 1622 1623 static int virtnet_set_mac_address(struct net_device *dev, void *p) 1624 { 1625 struct virtnet_info *vi = netdev_priv(dev); 1626 struct virtio_device *vdev = vi->vdev; 1627 int ret; 1628 struct sockaddr *addr; 1629 struct scatterlist sg; 1630 1631 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 1632 return -EOPNOTSUPP; 1633 1634 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 1635 if (!addr) 1636 return -ENOMEM; 1637 1638 ret = eth_prepare_mac_addr_change(dev, addr); 1639 if (ret) 1640 goto out; 1641 1642 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 1643 sg_init_one(&sg, addr->sa_data, dev->addr_len); 1644 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1645 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 1646 dev_warn(&vdev->dev, 1647 "Failed to set mac address by vq command.\n"); 1648 ret = -EINVAL; 1649 goto out; 1650 } 1651 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 1652 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1653 unsigned int i; 1654 1655 /* Naturally, this has an atomicity problem. */ 1656 for (i = 0; i < dev->addr_len; i++) 1657 virtio_cwrite8(vdev, 1658 offsetof(struct virtio_net_config, mac) + 1659 i, addr->sa_data[i]); 1660 } 1661 1662 eth_commit_mac_addr_change(dev, p); 1663 ret = 0; 1664 1665 out: 1666 kfree(addr); 1667 return ret; 1668 } 1669 1670 static void virtnet_stats(struct net_device *dev, 1671 struct rtnl_link_stats64 *tot) 1672 { 1673 struct virtnet_info *vi = netdev_priv(dev); 1674 unsigned int start; 1675 int i; 1676 1677 for (i = 0; i < vi->max_queue_pairs; i++) { 1678 u64 tpackets, tbytes, rpackets, rbytes, rdrops; 1679 struct receive_queue *rq = &vi->rq[i]; 1680 struct send_queue *sq = &vi->sq[i]; 1681 1682 do { 1683 start = u64_stats_fetch_begin_irq(&sq->stats.syncp); 1684 tpackets = sq->stats.packets; 1685 tbytes = sq->stats.bytes; 1686 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); 1687 1688 do { 1689 start = u64_stats_fetch_begin_irq(&rq->stats.syncp); 1690 rpackets = rq->stats.packets; 1691 rbytes = rq->stats.bytes; 1692 rdrops = rq->stats.drops; 1693 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); 1694 1695 tot->rx_packets += rpackets; 1696 tot->tx_packets += tpackets; 1697 tot->rx_bytes += rbytes; 1698 tot->tx_bytes += tbytes; 1699 tot->rx_dropped += rdrops; 1700 } 1701 1702 tot->tx_dropped = dev->stats.tx_dropped; 1703 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 1704 tot->rx_length_errors = dev->stats.rx_length_errors; 1705 tot->rx_frame_errors = dev->stats.rx_frame_errors; 1706 } 1707 1708 static void virtnet_ack_link_announce(struct virtnet_info *vi) 1709 { 1710 rtnl_lock(); 1711 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 1712 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 1713 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 1714 rtnl_unlock(); 1715 } 1716 1717 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1718 { 1719 struct scatterlist sg; 1720 struct net_device *dev = vi->dev; 1721 1722 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 1723 return 0; 1724 1725 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 1726 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 1727 1728 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 1729 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 1730 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 1731 queue_pairs); 1732 return -EINVAL; 1733 } else { 1734 vi->curr_queue_pairs = queue_pairs; 1735 /* virtnet_open() will refill when device is going to up. */ 1736 if (dev->flags & IFF_UP) 1737 schedule_delayed_work(&vi->refill, 0); 1738 } 1739 1740 return 0; 1741 } 1742 1743 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 1744 { 1745 int err; 1746 1747 rtnl_lock(); 1748 err = _virtnet_set_queues(vi, queue_pairs); 1749 rtnl_unlock(); 1750 return err; 1751 } 1752 1753 static int virtnet_close(struct net_device *dev) 1754 { 1755 struct virtnet_info *vi = netdev_priv(dev); 1756 int i; 1757 1758 /* Make sure refill_work doesn't re-enable napi! */ 1759 cancel_delayed_work_sync(&vi->refill); 1760 1761 for (i = 0; i < vi->max_queue_pairs; i++) { 1762 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1763 napi_disable(&vi->rq[i].napi); 1764 virtnet_napi_tx_disable(&vi->sq[i].napi); 1765 } 1766 1767 return 0; 1768 } 1769 1770 static void virtnet_set_rx_mode(struct net_device *dev) 1771 { 1772 struct virtnet_info *vi = netdev_priv(dev); 1773 struct scatterlist sg[2]; 1774 struct virtio_net_ctrl_mac *mac_data; 1775 struct netdev_hw_addr *ha; 1776 int uc_count; 1777 int mc_count; 1778 void *buf; 1779 int i; 1780 1781 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 1782 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 1783 return; 1784 1785 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 1786 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 1787 1788 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 1789 1790 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1791 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 1792 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 1793 vi->ctrl->promisc ? "en" : "dis"); 1794 1795 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 1796 1797 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 1798 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 1799 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 1800 vi->ctrl->allmulti ? "en" : "dis"); 1801 1802 uc_count = netdev_uc_count(dev); 1803 mc_count = netdev_mc_count(dev); 1804 /* MAC filter - use one buffer for both lists */ 1805 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 1806 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 1807 mac_data = buf; 1808 if (!buf) 1809 return; 1810 1811 sg_init_table(sg, 2); 1812 1813 /* Store the unicast list and count in the front of the buffer */ 1814 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 1815 i = 0; 1816 netdev_for_each_uc_addr(ha, dev) 1817 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1818 1819 sg_set_buf(&sg[0], mac_data, 1820 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 1821 1822 /* multicast list and count fill the end */ 1823 mac_data = (void *)&mac_data->macs[uc_count][0]; 1824 1825 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 1826 i = 0; 1827 netdev_for_each_mc_addr(ha, dev) 1828 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 1829 1830 sg_set_buf(&sg[1], mac_data, 1831 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 1832 1833 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 1834 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 1835 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 1836 1837 kfree(buf); 1838 } 1839 1840 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 1841 __be16 proto, u16 vid) 1842 { 1843 struct virtnet_info *vi = netdev_priv(dev); 1844 struct scatterlist sg; 1845 1846 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 1847 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 1848 1849 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1850 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 1851 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 1852 return 0; 1853 } 1854 1855 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 1856 __be16 proto, u16 vid) 1857 { 1858 struct virtnet_info *vi = netdev_priv(dev); 1859 struct scatterlist sg; 1860 1861 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 1862 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 1863 1864 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 1865 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 1866 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 1867 return 0; 1868 } 1869 1870 static void virtnet_clean_affinity(struct virtnet_info *vi, long hcpu) 1871 { 1872 int i; 1873 1874 if (vi->affinity_hint_set) { 1875 for (i = 0; i < vi->max_queue_pairs; i++) { 1876 virtqueue_set_affinity(vi->rq[i].vq, NULL); 1877 virtqueue_set_affinity(vi->sq[i].vq, NULL); 1878 } 1879 1880 vi->affinity_hint_set = false; 1881 } 1882 } 1883 1884 static void virtnet_set_affinity(struct virtnet_info *vi) 1885 { 1886 cpumask_var_t mask; 1887 int stragglers; 1888 int group_size; 1889 int i, j, cpu; 1890 int num_cpu; 1891 int stride; 1892 1893 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 1894 virtnet_clean_affinity(vi, -1); 1895 return; 1896 } 1897 1898 num_cpu = num_online_cpus(); 1899 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 1900 stragglers = num_cpu >= vi->curr_queue_pairs ? 1901 num_cpu % vi->curr_queue_pairs : 1902 0; 1903 cpu = cpumask_next(-1, cpu_online_mask); 1904 1905 for (i = 0; i < vi->curr_queue_pairs; i++) { 1906 group_size = stride + (i < stragglers ? 1 : 0); 1907 1908 for (j = 0; j < group_size; j++) { 1909 cpumask_set_cpu(cpu, mask); 1910 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 1911 nr_cpu_ids, false); 1912 } 1913 virtqueue_set_affinity(vi->rq[i].vq, mask); 1914 virtqueue_set_affinity(vi->sq[i].vq, mask); 1915 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, false); 1916 cpumask_clear(mask); 1917 } 1918 1919 vi->affinity_hint_set = true; 1920 free_cpumask_var(mask); 1921 } 1922 1923 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 1924 { 1925 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 1926 node); 1927 virtnet_set_affinity(vi); 1928 return 0; 1929 } 1930 1931 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 1932 { 1933 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 1934 node_dead); 1935 virtnet_set_affinity(vi); 1936 return 0; 1937 } 1938 1939 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 1940 { 1941 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 1942 node); 1943 1944 virtnet_clean_affinity(vi, cpu); 1945 return 0; 1946 } 1947 1948 static enum cpuhp_state virtionet_online; 1949 1950 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 1951 { 1952 int ret; 1953 1954 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 1955 if (ret) 1956 return ret; 1957 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 1958 &vi->node_dead); 1959 if (!ret) 1960 return ret; 1961 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 1962 return ret; 1963 } 1964 1965 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 1966 { 1967 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 1968 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 1969 &vi->node_dead); 1970 } 1971 1972 static void virtnet_get_ringparam(struct net_device *dev, 1973 struct ethtool_ringparam *ring) 1974 { 1975 struct virtnet_info *vi = netdev_priv(dev); 1976 1977 ring->rx_max_pending = virtqueue_get_vring_size(vi->rq[0].vq); 1978 ring->tx_max_pending = virtqueue_get_vring_size(vi->sq[0].vq); 1979 ring->rx_pending = ring->rx_max_pending; 1980 ring->tx_pending = ring->tx_max_pending; 1981 } 1982 1983 1984 static void virtnet_get_drvinfo(struct net_device *dev, 1985 struct ethtool_drvinfo *info) 1986 { 1987 struct virtnet_info *vi = netdev_priv(dev); 1988 struct virtio_device *vdev = vi->vdev; 1989 1990 strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 1991 strlcpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 1992 strlcpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 1993 1994 } 1995 1996 /* TODO: Eliminate OOO packets during switching */ 1997 static int virtnet_set_channels(struct net_device *dev, 1998 struct ethtool_channels *channels) 1999 { 2000 struct virtnet_info *vi = netdev_priv(dev); 2001 u16 queue_pairs = channels->combined_count; 2002 int err; 2003 2004 /* We don't support separate rx/tx channels. 2005 * We don't allow setting 'other' channels. 2006 */ 2007 if (channels->rx_count || channels->tx_count || channels->other_count) 2008 return -EINVAL; 2009 2010 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2011 return -EINVAL; 2012 2013 /* For now we don't support modifying channels while XDP is loaded 2014 * also when XDP is loaded all RX queues have XDP programs so we only 2015 * need to check a single RX queue. 2016 */ 2017 if (vi->rq[0].xdp_prog) 2018 return -EINVAL; 2019 2020 get_online_cpus(); 2021 err = _virtnet_set_queues(vi, queue_pairs); 2022 if (!err) { 2023 netif_set_real_num_tx_queues(dev, queue_pairs); 2024 netif_set_real_num_rx_queues(dev, queue_pairs); 2025 2026 virtnet_set_affinity(vi); 2027 } 2028 put_online_cpus(); 2029 2030 return err; 2031 } 2032 2033 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2034 { 2035 struct virtnet_info *vi = netdev_priv(dev); 2036 char *p = (char *)data; 2037 unsigned int i, j; 2038 2039 switch (stringset) { 2040 case ETH_SS_STATS: 2041 for (i = 0; i < vi->curr_queue_pairs; i++) { 2042 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2043 snprintf(p, ETH_GSTRING_LEN, "rx_queue_%u_%s", 2044 i, virtnet_rq_stats_desc[j].desc); 2045 p += ETH_GSTRING_LEN; 2046 } 2047 } 2048 2049 for (i = 0; i < vi->curr_queue_pairs; i++) { 2050 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2051 snprintf(p, ETH_GSTRING_LEN, "tx_queue_%u_%s", 2052 i, virtnet_sq_stats_desc[j].desc); 2053 p += ETH_GSTRING_LEN; 2054 } 2055 } 2056 break; 2057 } 2058 } 2059 2060 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2061 { 2062 struct virtnet_info *vi = netdev_priv(dev); 2063 2064 switch (sset) { 2065 case ETH_SS_STATS: 2066 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2067 VIRTNET_SQ_STATS_LEN); 2068 default: 2069 return -EOPNOTSUPP; 2070 } 2071 } 2072 2073 static void virtnet_get_ethtool_stats(struct net_device *dev, 2074 struct ethtool_stats *stats, u64 *data) 2075 { 2076 struct virtnet_info *vi = netdev_priv(dev); 2077 unsigned int idx = 0, start, i, j; 2078 const u8 *stats_base; 2079 size_t offset; 2080 2081 for (i = 0; i < vi->curr_queue_pairs; i++) { 2082 struct receive_queue *rq = &vi->rq[i]; 2083 2084 stats_base = (u8 *)&rq->stats; 2085 do { 2086 start = u64_stats_fetch_begin_irq(&rq->stats.syncp); 2087 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2088 offset = virtnet_rq_stats_desc[j].offset; 2089 data[idx + j] = *(u64 *)(stats_base + offset); 2090 } 2091 } while (u64_stats_fetch_retry_irq(&rq->stats.syncp, start)); 2092 idx += VIRTNET_RQ_STATS_LEN; 2093 } 2094 2095 for (i = 0; i < vi->curr_queue_pairs; i++) { 2096 struct send_queue *sq = &vi->sq[i]; 2097 2098 stats_base = (u8 *)&sq->stats; 2099 do { 2100 start = u64_stats_fetch_begin_irq(&sq->stats.syncp); 2101 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2102 offset = virtnet_sq_stats_desc[j].offset; 2103 data[idx + j] = *(u64 *)(stats_base + offset); 2104 } 2105 } while (u64_stats_fetch_retry_irq(&sq->stats.syncp, start)); 2106 idx += VIRTNET_SQ_STATS_LEN; 2107 } 2108 } 2109 2110 static void virtnet_get_channels(struct net_device *dev, 2111 struct ethtool_channels *channels) 2112 { 2113 struct virtnet_info *vi = netdev_priv(dev); 2114 2115 channels->combined_count = vi->curr_queue_pairs; 2116 channels->max_combined = vi->max_queue_pairs; 2117 channels->max_other = 0; 2118 channels->rx_count = 0; 2119 channels->tx_count = 0; 2120 channels->other_count = 0; 2121 } 2122 2123 /* Check if the user is trying to change anything besides speed/duplex */ 2124 static bool 2125 virtnet_validate_ethtool_cmd(const struct ethtool_link_ksettings *cmd) 2126 { 2127 struct ethtool_link_ksettings diff1 = *cmd; 2128 struct ethtool_link_ksettings diff2 = {}; 2129 2130 /* cmd is always set so we need to clear it, validate the port type 2131 * and also without autonegotiation we can ignore advertising 2132 */ 2133 diff1.base.speed = 0; 2134 diff2.base.port = PORT_OTHER; 2135 ethtool_link_ksettings_zero_link_mode(&diff1, advertising); 2136 diff1.base.duplex = 0; 2137 diff1.base.cmd = 0; 2138 diff1.base.link_mode_masks_nwords = 0; 2139 2140 return !memcmp(&diff1.base, &diff2.base, sizeof(diff1.base)) && 2141 bitmap_empty(diff1.link_modes.supported, 2142 __ETHTOOL_LINK_MODE_MASK_NBITS) && 2143 bitmap_empty(diff1.link_modes.advertising, 2144 __ETHTOOL_LINK_MODE_MASK_NBITS) && 2145 bitmap_empty(diff1.link_modes.lp_advertising, 2146 __ETHTOOL_LINK_MODE_MASK_NBITS); 2147 } 2148 2149 static int virtnet_set_link_ksettings(struct net_device *dev, 2150 const struct ethtool_link_ksettings *cmd) 2151 { 2152 struct virtnet_info *vi = netdev_priv(dev); 2153 u32 speed; 2154 2155 speed = cmd->base.speed; 2156 /* don't allow custom speed and duplex */ 2157 if (!ethtool_validate_speed(speed) || 2158 !ethtool_validate_duplex(cmd->base.duplex) || 2159 !virtnet_validate_ethtool_cmd(cmd)) 2160 return -EINVAL; 2161 vi->speed = speed; 2162 vi->duplex = cmd->base.duplex; 2163 2164 return 0; 2165 } 2166 2167 static int virtnet_get_link_ksettings(struct net_device *dev, 2168 struct ethtool_link_ksettings *cmd) 2169 { 2170 struct virtnet_info *vi = netdev_priv(dev); 2171 2172 cmd->base.speed = vi->speed; 2173 cmd->base.duplex = vi->duplex; 2174 cmd->base.port = PORT_OTHER; 2175 2176 return 0; 2177 } 2178 2179 static int virtnet_set_coalesce(struct net_device *dev, 2180 struct ethtool_coalesce *ec) 2181 { 2182 struct ethtool_coalesce ec_default = { 2183 .cmd = ETHTOOL_SCOALESCE, 2184 .rx_max_coalesced_frames = 1, 2185 }; 2186 struct virtnet_info *vi = netdev_priv(dev); 2187 int i, napi_weight; 2188 2189 if (ec->tx_max_coalesced_frames > 1) 2190 return -EINVAL; 2191 2192 ec_default.tx_max_coalesced_frames = ec->tx_max_coalesced_frames; 2193 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 2194 2195 /* disallow changes to fields not explicitly tested above */ 2196 if (memcmp(ec, &ec_default, sizeof(ec_default))) 2197 return -EINVAL; 2198 2199 if (napi_weight ^ vi->sq[0].napi.weight) { 2200 if (dev->flags & IFF_UP) 2201 return -EBUSY; 2202 for (i = 0; i < vi->max_queue_pairs; i++) 2203 vi->sq[i].napi.weight = napi_weight; 2204 } 2205 2206 return 0; 2207 } 2208 2209 static int virtnet_get_coalesce(struct net_device *dev, 2210 struct ethtool_coalesce *ec) 2211 { 2212 struct ethtool_coalesce ec_default = { 2213 .cmd = ETHTOOL_GCOALESCE, 2214 .rx_max_coalesced_frames = 1, 2215 }; 2216 struct virtnet_info *vi = netdev_priv(dev); 2217 2218 memcpy(ec, &ec_default, sizeof(ec_default)); 2219 2220 if (vi->sq[0].napi.weight) 2221 ec->tx_max_coalesced_frames = 1; 2222 2223 return 0; 2224 } 2225 2226 static void virtnet_init_settings(struct net_device *dev) 2227 { 2228 struct virtnet_info *vi = netdev_priv(dev); 2229 2230 vi->speed = SPEED_UNKNOWN; 2231 vi->duplex = DUPLEX_UNKNOWN; 2232 } 2233 2234 static void virtnet_update_settings(struct virtnet_info *vi) 2235 { 2236 u32 speed; 2237 u8 duplex; 2238 2239 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 2240 return; 2241 2242 speed = virtio_cread32(vi->vdev, offsetof(struct virtio_net_config, 2243 speed)); 2244 if (ethtool_validate_speed(speed)) 2245 vi->speed = speed; 2246 duplex = virtio_cread8(vi->vdev, offsetof(struct virtio_net_config, 2247 duplex)); 2248 if (ethtool_validate_duplex(duplex)) 2249 vi->duplex = duplex; 2250 } 2251 2252 static const struct ethtool_ops virtnet_ethtool_ops = { 2253 .get_drvinfo = virtnet_get_drvinfo, 2254 .get_link = ethtool_op_get_link, 2255 .get_ringparam = virtnet_get_ringparam, 2256 .get_strings = virtnet_get_strings, 2257 .get_sset_count = virtnet_get_sset_count, 2258 .get_ethtool_stats = virtnet_get_ethtool_stats, 2259 .set_channels = virtnet_set_channels, 2260 .get_channels = virtnet_get_channels, 2261 .get_ts_info = ethtool_op_get_ts_info, 2262 .get_link_ksettings = virtnet_get_link_ksettings, 2263 .set_link_ksettings = virtnet_set_link_ksettings, 2264 .set_coalesce = virtnet_set_coalesce, 2265 .get_coalesce = virtnet_get_coalesce, 2266 }; 2267 2268 static void virtnet_freeze_down(struct virtio_device *vdev) 2269 { 2270 struct virtnet_info *vi = vdev->priv; 2271 int i; 2272 2273 /* Make sure no work handler is accessing the device */ 2274 flush_work(&vi->config_work); 2275 2276 netif_tx_lock_bh(vi->dev); 2277 netif_device_detach(vi->dev); 2278 netif_tx_unlock_bh(vi->dev); 2279 cancel_delayed_work_sync(&vi->refill); 2280 2281 if (netif_running(vi->dev)) { 2282 for (i = 0; i < vi->max_queue_pairs; i++) { 2283 napi_disable(&vi->rq[i].napi); 2284 virtnet_napi_tx_disable(&vi->sq[i].napi); 2285 } 2286 } 2287 } 2288 2289 static int init_vqs(struct virtnet_info *vi); 2290 2291 static int virtnet_restore_up(struct virtio_device *vdev) 2292 { 2293 struct virtnet_info *vi = vdev->priv; 2294 int err, i; 2295 2296 err = init_vqs(vi); 2297 if (err) 2298 return err; 2299 2300 virtio_device_ready(vdev); 2301 2302 if (netif_running(vi->dev)) { 2303 for (i = 0; i < vi->curr_queue_pairs; i++) 2304 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 2305 schedule_delayed_work(&vi->refill, 0); 2306 2307 for (i = 0; i < vi->max_queue_pairs; i++) { 2308 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2309 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 2310 &vi->sq[i].napi); 2311 } 2312 } 2313 2314 netif_tx_lock_bh(vi->dev); 2315 netif_device_attach(vi->dev); 2316 netif_tx_unlock_bh(vi->dev); 2317 return err; 2318 } 2319 2320 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 2321 { 2322 struct scatterlist sg; 2323 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 2324 2325 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 2326 2327 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 2328 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 2329 dev_warn(&vi->dev->dev, "Fail to set guest offload. \n"); 2330 return -EINVAL; 2331 } 2332 2333 return 0; 2334 } 2335 2336 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 2337 { 2338 u64 offloads = 0; 2339 2340 if (!vi->guest_offloads) 2341 return 0; 2342 2343 return virtnet_set_guest_offloads(vi, offloads); 2344 } 2345 2346 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 2347 { 2348 u64 offloads = vi->guest_offloads; 2349 2350 if (!vi->guest_offloads) 2351 return 0; 2352 2353 return virtnet_set_guest_offloads(vi, offloads); 2354 } 2355 2356 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 2357 struct netlink_ext_ack *extack) 2358 { 2359 unsigned long int max_sz = PAGE_SIZE - sizeof(struct padded_vnet_hdr); 2360 struct virtnet_info *vi = netdev_priv(dev); 2361 struct bpf_prog *old_prog; 2362 u16 xdp_qp = 0, curr_qp; 2363 int i, err; 2364 2365 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 2366 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 2367 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 2368 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 2369 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 2370 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM))) { 2371 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing LRO/CSUM, disable LRO/CSUM first"); 2372 return -EOPNOTSUPP; 2373 } 2374 2375 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 2376 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 2377 return -EINVAL; 2378 } 2379 2380 if (dev->mtu > max_sz) { 2381 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP"); 2382 netdev_warn(dev, "XDP requires MTU less than %lu\n", max_sz); 2383 return -EINVAL; 2384 } 2385 2386 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 2387 if (prog) 2388 xdp_qp = nr_cpu_ids; 2389 2390 /* XDP requires extra queues for XDP_TX */ 2391 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 2392 NL_SET_ERR_MSG_MOD(extack, "Too few free TX rings available"); 2393 netdev_warn(dev, "request %i queues but max is %i\n", 2394 curr_qp + xdp_qp, vi->max_queue_pairs); 2395 return -ENOMEM; 2396 } 2397 2398 if (prog) { 2399 prog = bpf_prog_add(prog, vi->max_queue_pairs - 1); 2400 if (IS_ERR(prog)) 2401 return PTR_ERR(prog); 2402 } 2403 2404 /* Make sure NAPI is not using any XDP TX queues for RX. */ 2405 if (netif_running(dev)) 2406 for (i = 0; i < vi->max_queue_pairs; i++) 2407 napi_disable(&vi->rq[i].napi); 2408 2409 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 2410 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 2411 if (err) 2412 goto err; 2413 vi->xdp_queue_pairs = xdp_qp; 2414 2415 for (i = 0; i < vi->max_queue_pairs; i++) { 2416 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2417 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 2418 if (i == 0) { 2419 if (!old_prog) 2420 virtnet_clear_guest_offloads(vi); 2421 if (!prog) 2422 virtnet_restore_guest_offloads(vi); 2423 } 2424 if (old_prog) 2425 bpf_prog_put(old_prog); 2426 if (netif_running(dev)) 2427 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2428 } 2429 2430 return 0; 2431 2432 err: 2433 for (i = 0; i < vi->max_queue_pairs; i++) 2434 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 2435 if (prog) 2436 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 2437 return err; 2438 } 2439 2440 static u32 virtnet_xdp_query(struct net_device *dev) 2441 { 2442 struct virtnet_info *vi = netdev_priv(dev); 2443 const struct bpf_prog *xdp_prog; 2444 int i; 2445 2446 for (i = 0; i < vi->max_queue_pairs; i++) { 2447 xdp_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2448 if (xdp_prog) 2449 return xdp_prog->aux->id; 2450 } 2451 return 0; 2452 } 2453 2454 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 2455 { 2456 switch (xdp->command) { 2457 case XDP_SETUP_PROG: 2458 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 2459 case XDP_QUERY_PROG: 2460 xdp->prog_id = virtnet_xdp_query(dev); 2461 return 0; 2462 default: 2463 return -EINVAL; 2464 } 2465 } 2466 2467 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 2468 size_t len) 2469 { 2470 struct virtnet_info *vi = netdev_priv(dev); 2471 int ret; 2472 2473 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2474 return -EOPNOTSUPP; 2475 2476 ret = snprintf(buf, len, "sby"); 2477 if (ret >= len) 2478 return -EOPNOTSUPP; 2479 2480 return 0; 2481 } 2482 2483 static int virtnet_set_features(struct net_device *dev, 2484 netdev_features_t features) 2485 { 2486 struct virtnet_info *vi = netdev_priv(dev); 2487 u64 offloads; 2488 int err; 2489 2490 if ((dev->features ^ features) & NETIF_F_LRO) { 2491 if (vi->xdp_queue_pairs) 2492 return -EBUSY; 2493 2494 if (features & NETIF_F_LRO) 2495 offloads = vi->guest_offloads_capable; 2496 else 2497 offloads = 0; 2498 2499 err = virtnet_set_guest_offloads(vi, offloads); 2500 if (err) 2501 return err; 2502 vi->guest_offloads = offloads; 2503 } 2504 2505 return 0; 2506 } 2507 2508 static const struct net_device_ops virtnet_netdev = { 2509 .ndo_open = virtnet_open, 2510 .ndo_stop = virtnet_close, 2511 .ndo_start_xmit = start_xmit, 2512 .ndo_validate_addr = eth_validate_addr, 2513 .ndo_set_mac_address = virtnet_set_mac_address, 2514 .ndo_set_rx_mode = virtnet_set_rx_mode, 2515 .ndo_get_stats64 = virtnet_stats, 2516 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 2517 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 2518 .ndo_bpf = virtnet_xdp, 2519 .ndo_xdp_xmit = virtnet_xdp_xmit, 2520 .ndo_features_check = passthru_features_check, 2521 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 2522 .ndo_set_features = virtnet_set_features, 2523 }; 2524 2525 static void virtnet_config_changed_work(struct work_struct *work) 2526 { 2527 struct virtnet_info *vi = 2528 container_of(work, struct virtnet_info, config_work); 2529 u16 v; 2530 2531 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 2532 struct virtio_net_config, status, &v) < 0) 2533 return; 2534 2535 if (v & VIRTIO_NET_S_ANNOUNCE) { 2536 netdev_notify_peers(vi->dev); 2537 virtnet_ack_link_announce(vi); 2538 } 2539 2540 /* Ignore unknown (future) status bits */ 2541 v &= VIRTIO_NET_S_LINK_UP; 2542 2543 if (vi->status == v) 2544 return; 2545 2546 vi->status = v; 2547 2548 if (vi->status & VIRTIO_NET_S_LINK_UP) { 2549 virtnet_update_settings(vi); 2550 netif_carrier_on(vi->dev); 2551 netif_tx_wake_all_queues(vi->dev); 2552 } else { 2553 netif_carrier_off(vi->dev); 2554 netif_tx_stop_all_queues(vi->dev); 2555 } 2556 } 2557 2558 static void virtnet_config_changed(struct virtio_device *vdev) 2559 { 2560 struct virtnet_info *vi = vdev->priv; 2561 2562 schedule_work(&vi->config_work); 2563 } 2564 2565 static void virtnet_free_queues(struct virtnet_info *vi) 2566 { 2567 int i; 2568 2569 for (i = 0; i < vi->max_queue_pairs; i++) { 2570 napi_hash_del(&vi->rq[i].napi); 2571 netif_napi_del(&vi->rq[i].napi); 2572 netif_napi_del(&vi->sq[i].napi); 2573 } 2574 2575 /* We called napi_hash_del() before netif_napi_del(), 2576 * we need to respect an RCU grace period before freeing vi->rq 2577 */ 2578 synchronize_net(); 2579 2580 kfree(vi->rq); 2581 kfree(vi->sq); 2582 kfree(vi->ctrl); 2583 } 2584 2585 static void _free_receive_bufs(struct virtnet_info *vi) 2586 { 2587 struct bpf_prog *old_prog; 2588 int i; 2589 2590 for (i = 0; i < vi->max_queue_pairs; i++) { 2591 while (vi->rq[i].pages) 2592 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 2593 2594 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 2595 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 2596 if (old_prog) 2597 bpf_prog_put(old_prog); 2598 } 2599 } 2600 2601 static void free_receive_bufs(struct virtnet_info *vi) 2602 { 2603 rtnl_lock(); 2604 _free_receive_bufs(vi); 2605 rtnl_unlock(); 2606 } 2607 2608 static void free_receive_page_frags(struct virtnet_info *vi) 2609 { 2610 int i; 2611 for (i = 0; i < vi->max_queue_pairs; i++) 2612 if (vi->rq[i].alloc_frag.page) 2613 put_page(vi->rq[i].alloc_frag.page); 2614 } 2615 2616 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) 2617 { 2618 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) 2619 return false; 2620 else if (q < vi->curr_queue_pairs) 2621 return true; 2622 else 2623 return false; 2624 } 2625 2626 static void free_unused_bufs(struct virtnet_info *vi) 2627 { 2628 void *buf; 2629 int i; 2630 2631 for (i = 0; i < vi->max_queue_pairs; i++) { 2632 struct virtqueue *vq = vi->sq[i].vq; 2633 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 2634 if (!is_xdp_raw_buffer_queue(vi, i)) 2635 dev_kfree_skb(buf); 2636 else 2637 put_page(virt_to_head_page(buf)); 2638 } 2639 } 2640 2641 for (i = 0; i < vi->max_queue_pairs; i++) { 2642 struct virtqueue *vq = vi->rq[i].vq; 2643 2644 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) { 2645 if (vi->mergeable_rx_bufs) { 2646 put_page(virt_to_head_page(buf)); 2647 } else if (vi->big_packets) { 2648 give_pages(&vi->rq[i], buf); 2649 } else { 2650 put_page(virt_to_head_page(buf)); 2651 } 2652 } 2653 } 2654 } 2655 2656 static void virtnet_del_vqs(struct virtnet_info *vi) 2657 { 2658 struct virtio_device *vdev = vi->vdev; 2659 2660 virtnet_clean_affinity(vi, -1); 2661 2662 vdev->config->del_vqs(vdev); 2663 2664 virtnet_free_queues(vi); 2665 } 2666 2667 /* How large should a single buffer be so a queue full of these can fit at 2668 * least one full packet? 2669 * Logic below assumes the mergeable buffer header is used. 2670 */ 2671 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 2672 { 2673 const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 2674 unsigned int rq_size = virtqueue_get_vring_size(vq); 2675 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 2676 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 2677 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 2678 2679 return max(max(min_buf_len, hdr_len) - hdr_len, 2680 (unsigned int)GOOD_PACKET_LEN); 2681 } 2682 2683 static int virtnet_find_vqs(struct virtnet_info *vi) 2684 { 2685 vq_callback_t **callbacks; 2686 struct virtqueue **vqs; 2687 int ret = -ENOMEM; 2688 int i, total_vqs; 2689 const char **names; 2690 bool *ctx; 2691 2692 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 2693 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 2694 * possible control vq. 2695 */ 2696 total_vqs = vi->max_queue_pairs * 2 + 2697 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 2698 2699 /* Allocate space for find_vqs parameters */ 2700 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 2701 if (!vqs) 2702 goto err_vq; 2703 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 2704 if (!callbacks) 2705 goto err_callback; 2706 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 2707 if (!names) 2708 goto err_names; 2709 if (!vi->big_packets || vi->mergeable_rx_bufs) { 2710 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 2711 if (!ctx) 2712 goto err_ctx; 2713 } else { 2714 ctx = NULL; 2715 } 2716 2717 /* Parameters for control virtqueue, if any */ 2718 if (vi->has_cvq) { 2719 callbacks[total_vqs - 1] = NULL; 2720 names[total_vqs - 1] = "control"; 2721 } 2722 2723 /* Allocate/initialize parameters for send/receive virtqueues */ 2724 for (i = 0; i < vi->max_queue_pairs; i++) { 2725 callbacks[rxq2vq(i)] = skb_recv_done; 2726 callbacks[txq2vq(i)] = skb_xmit_done; 2727 sprintf(vi->rq[i].name, "input.%d", i); 2728 sprintf(vi->sq[i].name, "output.%d", i); 2729 names[rxq2vq(i)] = vi->rq[i].name; 2730 names[txq2vq(i)] = vi->sq[i].name; 2731 if (ctx) 2732 ctx[rxq2vq(i)] = true; 2733 } 2734 2735 ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks, 2736 names, ctx, NULL); 2737 if (ret) 2738 goto err_find; 2739 2740 if (vi->has_cvq) { 2741 vi->cvq = vqs[total_vqs - 1]; 2742 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 2743 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 2744 } 2745 2746 for (i = 0; i < vi->max_queue_pairs; i++) { 2747 vi->rq[i].vq = vqs[rxq2vq(i)]; 2748 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 2749 vi->sq[i].vq = vqs[txq2vq(i)]; 2750 } 2751 2752 /* run here: ret == 0. */ 2753 2754 2755 err_find: 2756 kfree(ctx); 2757 err_ctx: 2758 kfree(names); 2759 err_names: 2760 kfree(callbacks); 2761 err_callback: 2762 kfree(vqs); 2763 err_vq: 2764 return ret; 2765 } 2766 2767 static int virtnet_alloc_queues(struct virtnet_info *vi) 2768 { 2769 int i; 2770 2771 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 2772 if (!vi->ctrl) 2773 goto err_ctrl; 2774 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 2775 if (!vi->sq) 2776 goto err_sq; 2777 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 2778 if (!vi->rq) 2779 goto err_rq; 2780 2781 INIT_DELAYED_WORK(&vi->refill, refill_work); 2782 for (i = 0; i < vi->max_queue_pairs; i++) { 2783 vi->rq[i].pages = NULL; 2784 netif_napi_add(vi->dev, &vi->rq[i].napi, virtnet_poll, 2785 napi_weight); 2786 netif_tx_napi_add(vi->dev, &vi->sq[i].napi, virtnet_poll_tx, 2787 napi_tx ? napi_weight : 0); 2788 2789 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 2790 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 2791 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 2792 2793 u64_stats_init(&vi->rq[i].stats.syncp); 2794 u64_stats_init(&vi->sq[i].stats.syncp); 2795 } 2796 2797 return 0; 2798 2799 err_rq: 2800 kfree(vi->sq); 2801 err_sq: 2802 kfree(vi->ctrl); 2803 err_ctrl: 2804 return -ENOMEM; 2805 } 2806 2807 static int init_vqs(struct virtnet_info *vi) 2808 { 2809 int ret; 2810 2811 /* Allocate send & receive queues */ 2812 ret = virtnet_alloc_queues(vi); 2813 if (ret) 2814 goto err; 2815 2816 ret = virtnet_find_vqs(vi); 2817 if (ret) 2818 goto err_free; 2819 2820 get_online_cpus(); 2821 virtnet_set_affinity(vi); 2822 put_online_cpus(); 2823 2824 return 0; 2825 2826 err_free: 2827 virtnet_free_queues(vi); 2828 err: 2829 return ret; 2830 } 2831 2832 #ifdef CONFIG_SYSFS 2833 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 2834 char *buf) 2835 { 2836 struct virtnet_info *vi = netdev_priv(queue->dev); 2837 unsigned int queue_index = get_netdev_rx_queue_index(queue); 2838 unsigned int headroom = virtnet_get_headroom(vi); 2839 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 2840 struct ewma_pkt_len *avg; 2841 2842 BUG_ON(queue_index >= vi->max_queue_pairs); 2843 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 2844 return sprintf(buf, "%u\n", 2845 get_mergeable_buf_len(&vi->rq[queue_index], avg, 2846 SKB_DATA_ALIGN(headroom + tailroom))); 2847 } 2848 2849 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 2850 __ATTR_RO(mergeable_rx_buffer_size); 2851 2852 static struct attribute *virtio_net_mrg_rx_attrs[] = { 2853 &mergeable_rx_buffer_size_attribute.attr, 2854 NULL 2855 }; 2856 2857 static const struct attribute_group virtio_net_mrg_rx_group = { 2858 .name = "virtio_net", 2859 .attrs = virtio_net_mrg_rx_attrs 2860 }; 2861 #endif 2862 2863 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 2864 unsigned int fbit, 2865 const char *fname, const char *dname) 2866 { 2867 if (!virtio_has_feature(vdev, fbit)) 2868 return false; 2869 2870 dev_err(&vdev->dev, "device advertises feature %s but not %s", 2871 fname, dname); 2872 2873 return true; 2874 } 2875 2876 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 2877 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 2878 2879 static bool virtnet_validate_features(struct virtio_device *vdev) 2880 { 2881 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 2882 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 2883 "VIRTIO_NET_F_CTRL_VQ") || 2884 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 2885 "VIRTIO_NET_F_CTRL_VQ") || 2886 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 2887 "VIRTIO_NET_F_CTRL_VQ") || 2888 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 2889 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 2890 "VIRTIO_NET_F_CTRL_VQ"))) { 2891 return false; 2892 } 2893 2894 return true; 2895 } 2896 2897 #define MIN_MTU ETH_MIN_MTU 2898 #define MAX_MTU ETH_MAX_MTU 2899 2900 static int virtnet_validate(struct virtio_device *vdev) 2901 { 2902 if (!vdev->config->get) { 2903 dev_err(&vdev->dev, "%s failure: config access disabled\n", 2904 __func__); 2905 return -EINVAL; 2906 } 2907 2908 if (!virtnet_validate_features(vdev)) 2909 return -EINVAL; 2910 2911 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 2912 int mtu = virtio_cread16(vdev, 2913 offsetof(struct virtio_net_config, 2914 mtu)); 2915 if (mtu < MIN_MTU) 2916 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 2917 } 2918 2919 return 0; 2920 } 2921 2922 static int virtnet_probe(struct virtio_device *vdev) 2923 { 2924 int i, err = -ENOMEM; 2925 struct net_device *dev; 2926 struct virtnet_info *vi; 2927 u16 max_queue_pairs; 2928 int mtu; 2929 2930 /* Find if host supports multiqueue virtio_net device */ 2931 err = virtio_cread_feature(vdev, VIRTIO_NET_F_MQ, 2932 struct virtio_net_config, 2933 max_virtqueue_pairs, &max_queue_pairs); 2934 2935 /* We need at least 2 queue's */ 2936 if (err || max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 2937 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 2938 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 2939 max_queue_pairs = 1; 2940 2941 /* Allocate ourselves a network device with room for our info */ 2942 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 2943 if (!dev) 2944 return -ENOMEM; 2945 2946 /* Set up network device as normal. */ 2947 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE; 2948 dev->netdev_ops = &virtnet_netdev; 2949 dev->features = NETIF_F_HIGHDMA; 2950 2951 dev->ethtool_ops = &virtnet_ethtool_ops; 2952 SET_NETDEV_DEV(dev, &vdev->dev); 2953 2954 /* Do we support "hardware" checksums? */ 2955 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 2956 /* This opens up the world of extra features. */ 2957 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 2958 if (csum) 2959 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 2960 2961 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 2962 dev->hw_features |= NETIF_F_TSO 2963 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 2964 } 2965 /* Individual feature bits: what can host handle? */ 2966 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 2967 dev->hw_features |= NETIF_F_TSO; 2968 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 2969 dev->hw_features |= NETIF_F_TSO6; 2970 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 2971 dev->hw_features |= NETIF_F_TSO_ECN; 2972 2973 dev->features |= NETIF_F_GSO_ROBUST; 2974 2975 if (gso) 2976 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 2977 /* (!csum && gso) case will be fixed by register_netdev() */ 2978 } 2979 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 2980 dev->features |= NETIF_F_RXCSUM; 2981 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 2982 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 2983 dev->features |= NETIF_F_LRO; 2984 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 2985 dev->hw_features |= NETIF_F_LRO; 2986 2987 dev->vlan_features = dev->features; 2988 2989 /* MTU range: 68 - 65535 */ 2990 dev->min_mtu = MIN_MTU; 2991 dev->max_mtu = MAX_MTU; 2992 2993 /* Configuration may specify what MAC to use. Otherwise random. */ 2994 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) 2995 virtio_cread_bytes(vdev, 2996 offsetof(struct virtio_net_config, mac), 2997 dev->dev_addr, dev->addr_len); 2998 else 2999 eth_hw_addr_random(dev); 3000 3001 /* Set up our device-specific information */ 3002 vi = netdev_priv(dev); 3003 vi->dev = dev; 3004 vi->vdev = vdev; 3005 vdev->priv = vi; 3006 3007 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 3008 3009 /* If we can receive ANY GSO packets, we must allocate large ones. */ 3010 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3011 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) || 3012 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) || 3013 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO)) 3014 vi->big_packets = true; 3015 3016 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) 3017 vi->mergeable_rx_bufs = true; 3018 3019 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 3020 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 3021 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 3022 else 3023 vi->hdr_len = sizeof(struct virtio_net_hdr); 3024 3025 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 3026 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 3027 vi->any_header_sg = true; 3028 3029 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 3030 vi->has_cvq = true; 3031 3032 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3033 mtu = virtio_cread16(vdev, 3034 offsetof(struct virtio_net_config, 3035 mtu)); 3036 if (mtu < dev->min_mtu) { 3037 /* Should never trigger: MTU was previously validated 3038 * in virtnet_validate. 3039 */ 3040 dev_err(&vdev->dev, "device MTU appears to have changed " 3041 "it is now %d < %d", mtu, dev->min_mtu); 3042 goto free; 3043 } 3044 3045 dev->mtu = mtu; 3046 dev->max_mtu = mtu; 3047 3048 /* TODO: size buffers correctly in this case. */ 3049 if (dev->mtu > ETH_DATA_LEN) 3050 vi->big_packets = true; 3051 } 3052 3053 if (vi->any_header_sg) 3054 dev->needed_headroom = vi->hdr_len; 3055 3056 /* Enable multiqueue by default */ 3057 if (num_online_cpus() >= max_queue_pairs) 3058 vi->curr_queue_pairs = max_queue_pairs; 3059 else 3060 vi->curr_queue_pairs = num_online_cpus(); 3061 vi->max_queue_pairs = max_queue_pairs; 3062 3063 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 3064 err = init_vqs(vi); 3065 if (err) 3066 goto free; 3067 3068 #ifdef CONFIG_SYSFS 3069 if (vi->mergeable_rx_bufs) 3070 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 3071 #endif 3072 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 3073 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 3074 3075 virtnet_init_settings(dev); 3076 3077 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 3078 vi->failover = net_failover_create(vi->dev); 3079 if (IS_ERR(vi->failover)) { 3080 err = PTR_ERR(vi->failover); 3081 goto free_vqs; 3082 } 3083 } 3084 3085 err = register_netdev(dev); 3086 if (err) { 3087 pr_debug("virtio_net: registering device failed\n"); 3088 goto free_failover; 3089 } 3090 3091 virtio_device_ready(vdev); 3092 3093 err = virtnet_cpu_notif_add(vi); 3094 if (err) { 3095 pr_debug("virtio_net: registering cpu notifier failed\n"); 3096 goto free_unregister_netdev; 3097 } 3098 3099 virtnet_set_queues(vi, vi->curr_queue_pairs); 3100 3101 /* Assume link up if device can't report link status, 3102 otherwise get link status from config. */ 3103 netif_carrier_off(dev); 3104 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 3105 schedule_work(&vi->config_work); 3106 } else { 3107 vi->status = VIRTIO_NET_S_LINK_UP; 3108 virtnet_update_settings(vi); 3109 netif_carrier_on(dev); 3110 } 3111 3112 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 3113 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 3114 set_bit(guest_offloads[i], &vi->guest_offloads); 3115 vi->guest_offloads_capable = vi->guest_offloads; 3116 3117 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 3118 dev->name, max_queue_pairs); 3119 3120 return 0; 3121 3122 free_unregister_netdev: 3123 vi->vdev->config->reset(vdev); 3124 3125 unregister_netdev(dev); 3126 free_failover: 3127 net_failover_destroy(vi->failover); 3128 free_vqs: 3129 cancel_delayed_work_sync(&vi->refill); 3130 free_receive_page_frags(vi); 3131 virtnet_del_vqs(vi); 3132 free: 3133 free_netdev(dev); 3134 return err; 3135 } 3136 3137 static void remove_vq_common(struct virtnet_info *vi) 3138 { 3139 vi->vdev->config->reset(vi->vdev); 3140 3141 /* Free unused buffers in both send and recv, if any. */ 3142 free_unused_bufs(vi); 3143 3144 free_receive_bufs(vi); 3145 3146 free_receive_page_frags(vi); 3147 3148 virtnet_del_vqs(vi); 3149 } 3150 3151 static void virtnet_remove(struct virtio_device *vdev) 3152 { 3153 struct virtnet_info *vi = vdev->priv; 3154 3155 virtnet_cpu_notif_remove(vi); 3156 3157 /* Make sure no work handler is accessing the device. */ 3158 flush_work(&vi->config_work); 3159 3160 unregister_netdev(vi->dev); 3161 3162 net_failover_destroy(vi->failover); 3163 3164 remove_vq_common(vi); 3165 3166 free_netdev(vi->dev); 3167 } 3168 3169 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 3170 { 3171 struct virtnet_info *vi = vdev->priv; 3172 3173 virtnet_cpu_notif_remove(vi); 3174 virtnet_freeze_down(vdev); 3175 remove_vq_common(vi); 3176 3177 return 0; 3178 } 3179 3180 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 3181 { 3182 struct virtnet_info *vi = vdev->priv; 3183 int err; 3184 3185 err = virtnet_restore_up(vdev); 3186 if (err) 3187 return err; 3188 virtnet_set_queues(vi, vi->curr_queue_pairs); 3189 3190 err = virtnet_cpu_notif_add(vi); 3191 if (err) 3192 return err; 3193 3194 return 0; 3195 } 3196 3197 static struct virtio_device_id id_table[] = { 3198 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 3199 { 0 }, 3200 }; 3201 3202 #define VIRTNET_FEATURES \ 3203 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 3204 VIRTIO_NET_F_MAC, \ 3205 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 3206 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 3207 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 3208 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 3209 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 3210 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 3211 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 3212 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 3213 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY 3214 3215 static unsigned int features[] = { 3216 VIRTNET_FEATURES, 3217 }; 3218 3219 static unsigned int features_legacy[] = { 3220 VIRTNET_FEATURES, 3221 VIRTIO_NET_F_GSO, 3222 VIRTIO_F_ANY_LAYOUT, 3223 }; 3224 3225 static struct virtio_driver virtio_net_driver = { 3226 .feature_table = features, 3227 .feature_table_size = ARRAY_SIZE(features), 3228 .feature_table_legacy = features_legacy, 3229 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 3230 .driver.name = KBUILD_MODNAME, 3231 .driver.owner = THIS_MODULE, 3232 .id_table = id_table, 3233 .validate = virtnet_validate, 3234 .probe = virtnet_probe, 3235 .remove = virtnet_remove, 3236 .config_changed = virtnet_config_changed, 3237 #ifdef CONFIG_PM_SLEEP 3238 .freeze = virtnet_freeze, 3239 .restore = virtnet_restore, 3240 #endif 3241 }; 3242 3243 static __init int virtio_net_driver_init(void) 3244 { 3245 int ret; 3246 3247 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 3248 virtnet_cpu_online, 3249 virtnet_cpu_down_prep); 3250 if (ret < 0) 3251 goto out; 3252 virtionet_online = ret; 3253 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 3254 NULL, virtnet_cpu_dead); 3255 if (ret) 3256 goto err_dead; 3257 3258 ret = register_virtio_driver(&virtio_net_driver); 3259 if (ret) 3260 goto err_virtio; 3261 return 0; 3262 err_virtio: 3263 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 3264 err_dead: 3265 cpuhp_remove_multi_state(virtionet_online); 3266 out: 3267 return ret; 3268 } 3269 module_init(virtio_net_driver_init); 3270 3271 static __exit void virtio_net_driver_exit(void) 3272 { 3273 unregister_virtio_driver(&virtio_net_driver); 3274 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 3275 cpuhp_remove_multi_state(virtionet_online); 3276 } 3277 module_exit(virtio_net_driver_exit); 3278 3279 MODULE_DEVICE_TABLE(virtio, id_table); 3280 MODULE_DESCRIPTION("Virtio network driver"); 3281 MODULE_LICENSE("GPL"); 3282