1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* A network driver using virtio. 3 * 4 * Copyright 2007 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation 5 */ 6 //#define DEBUG 7 #include <linux/netdevice.h> 8 #include <linux/etherdevice.h> 9 #include <linux/ethtool.h> 10 #include <linux/module.h> 11 #include <linux/virtio.h> 12 #include <linux/virtio_net.h> 13 #include <linux/bpf.h> 14 #include <linux/bpf_trace.h> 15 #include <linux/scatterlist.h> 16 #include <linux/if_vlan.h> 17 #include <linux/slab.h> 18 #include <linux/cpu.h> 19 #include <linux/average.h> 20 #include <linux/filter.h> 21 #include <linux/kernel.h> 22 #include <net/route.h> 23 #include <net/xdp.h> 24 #include <net/net_failover.h> 25 26 static int napi_weight = NAPI_POLL_WEIGHT; 27 module_param(napi_weight, int, 0444); 28 29 static bool csum = true, gso = true, napi_tx = true; 30 module_param(csum, bool, 0444); 31 module_param(gso, bool, 0444); 32 module_param(napi_tx, bool, 0644); 33 34 /* FIXME: MTU in config. */ 35 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) 36 #define GOOD_COPY_LEN 128 37 38 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) 39 40 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ 41 #define VIRTIO_XDP_HEADROOM 256 42 43 /* Separating two types of XDP xmit */ 44 #define VIRTIO_XDP_TX BIT(0) 45 #define VIRTIO_XDP_REDIR BIT(1) 46 47 #define VIRTIO_XDP_FLAG BIT(0) 48 49 /* RX packet size EWMA. The average packet size is used to determine the packet 50 * buffer size when refilling RX rings. As the entire RX ring may be refilled 51 * at once, the weight is chosen so that the EWMA will be insensitive to short- 52 * term, transient changes in packet size. 53 */ 54 DECLARE_EWMA(pkt_len, 0, 64) 55 56 #define VIRTNET_DRIVER_VERSION "1.0.0" 57 58 static const unsigned long guest_offloads[] = { 59 VIRTIO_NET_F_GUEST_TSO4, 60 VIRTIO_NET_F_GUEST_TSO6, 61 VIRTIO_NET_F_GUEST_ECN, 62 VIRTIO_NET_F_GUEST_UFO, 63 VIRTIO_NET_F_GUEST_CSUM, 64 VIRTIO_NET_F_GUEST_USO4, 65 VIRTIO_NET_F_GUEST_USO6 66 }; 67 68 #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ 69 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ 70 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ 71 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \ 72 (1ULL << VIRTIO_NET_F_GUEST_USO4) | \ 73 (1ULL << VIRTIO_NET_F_GUEST_USO6)) 74 75 struct virtnet_stat_desc { 76 char desc[ETH_GSTRING_LEN]; 77 size_t offset; 78 }; 79 80 struct virtnet_sq_stats { 81 struct u64_stats_sync syncp; 82 u64 packets; 83 u64 bytes; 84 u64 xdp_tx; 85 u64 xdp_tx_drops; 86 u64 kicks; 87 u64 tx_timeouts; 88 }; 89 90 struct virtnet_rq_stats { 91 struct u64_stats_sync syncp; 92 u64 packets; 93 u64 bytes; 94 u64 drops; 95 u64 xdp_packets; 96 u64 xdp_tx; 97 u64 xdp_redirects; 98 u64 xdp_drops; 99 u64 kicks; 100 }; 101 102 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) 103 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) 104 105 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { 106 { "packets", VIRTNET_SQ_STAT(packets) }, 107 { "bytes", VIRTNET_SQ_STAT(bytes) }, 108 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, 109 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, 110 { "kicks", VIRTNET_SQ_STAT(kicks) }, 111 { "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) }, 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.$index */ 137 char name[16]; 138 139 struct virtnet_sq_stats stats; 140 141 struct napi_struct napi; 142 143 /* Record whether sq is in reset state. */ 144 bool reset; 145 }; 146 147 /* Internal representation of a receive virtqueue */ 148 struct receive_queue { 149 /* Virtqueue associated with this receive_queue */ 150 struct virtqueue *vq; 151 152 struct napi_struct napi; 153 154 struct bpf_prog __rcu *xdp_prog; 155 156 struct virtnet_rq_stats stats; 157 158 /* Chain pages by the private ptr. */ 159 struct page *pages; 160 161 /* Average packet length for mergeable receive buffers. */ 162 struct ewma_pkt_len mrg_avg_pkt_len; 163 164 /* Page frag for packet buffer allocation. */ 165 struct page_frag alloc_frag; 166 167 /* RX: fragments + linear part + virtio header */ 168 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 169 170 /* Min single buffer size for mergeable buffers case. */ 171 unsigned int min_buf_len; 172 173 /* Name of this receive queue: input.$index */ 174 char name[16]; 175 176 struct xdp_rxq_info xdp_rxq; 177 }; 178 179 /* This structure can contain rss message with maximum settings for indirection table and keysize 180 * Note, that default structure that describes RSS configuration virtio_net_rss_config 181 * contains same info but can't handle table values. 182 * In any case, structure would be passed to virtio hw through sg_buf split by parts 183 * because table sizes may be differ according to the device configuration. 184 */ 185 #define VIRTIO_NET_RSS_MAX_KEY_SIZE 40 186 #define VIRTIO_NET_RSS_MAX_TABLE_LEN 128 187 struct virtio_net_ctrl_rss { 188 u32 hash_types; 189 u16 indirection_table_mask; 190 u16 unclassified_queue; 191 u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN]; 192 u16 max_tx_vq; 193 u8 hash_key_length; 194 u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE]; 195 }; 196 197 /* Control VQ buffers: protected by the rtnl lock */ 198 struct control_buf { 199 struct virtio_net_ctrl_hdr hdr; 200 virtio_net_ctrl_ack status; 201 struct virtio_net_ctrl_mq mq; 202 u8 promisc; 203 u8 allmulti; 204 __virtio16 vid; 205 __virtio64 offloads; 206 struct virtio_net_ctrl_rss rss; 207 }; 208 209 struct virtnet_info { 210 struct virtio_device *vdev; 211 struct virtqueue *cvq; 212 struct net_device *dev; 213 struct send_queue *sq; 214 struct receive_queue *rq; 215 unsigned int status; 216 217 /* Max # of queue pairs supported by the device */ 218 u16 max_queue_pairs; 219 220 /* # of queue pairs currently used by the driver */ 221 u16 curr_queue_pairs; 222 223 /* # of XDP queue pairs currently used by the driver */ 224 u16 xdp_queue_pairs; 225 226 /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */ 227 bool xdp_enabled; 228 229 /* I like... big packets and I cannot lie! */ 230 bool big_packets; 231 232 /* number of sg entries allocated for big packets */ 233 unsigned int big_packets_num_skbfrags; 234 235 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 236 bool mergeable_rx_bufs; 237 238 /* Host supports rss and/or hash report */ 239 bool has_rss; 240 bool has_rss_hash_report; 241 u8 rss_key_size; 242 u16 rss_indir_table_size; 243 u32 rss_hash_types_supported; 244 u32 rss_hash_types_saved; 245 246 /* Has control virtqueue */ 247 bool has_cvq; 248 249 /* Host can handle any s/g split between our header and packet data */ 250 bool any_header_sg; 251 252 /* Packet virtio header size */ 253 u8 hdr_len; 254 255 /* Work struct for delayed refilling if we run low on memory. */ 256 struct delayed_work refill; 257 258 /* Is delayed refill enabled? */ 259 bool refill_enabled; 260 261 /* The lock to synchronize the access to refill_enabled */ 262 spinlock_t refill_lock; 263 264 /* Work struct for config space updates */ 265 struct work_struct config_work; 266 267 /* Does the affinity hint is set for virtqueues? */ 268 bool affinity_hint_set; 269 270 /* CPU hotplug instances for online & dead */ 271 struct hlist_node node; 272 struct hlist_node node_dead; 273 274 struct control_buf *ctrl; 275 276 /* Ethtool settings */ 277 u8 duplex; 278 u32 speed; 279 280 /* Interrupt coalescing settings */ 281 u32 tx_usecs; 282 u32 rx_usecs; 283 u32 tx_max_packets; 284 u32 rx_max_packets; 285 286 unsigned long guest_offloads; 287 unsigned long guest_offloads_capable; 288 289 /* failover when STANDBY feature enabled */ 290 struct failover *failover; 291 }; 292 293 struct padded_vnet_hdr { 294 struct virtio_net_hdr_v1_hash hdr; 295 /* 296 * hdr is in a separate sg buffer, and data sg buffer shares same page 297 * with this header sg. This padding makes next sg 16 byte aligned 298 * after the header. 299 */ 300 char padding[12]; 301 }; 302 303 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); 304 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf); 305 306 static bool is_xdp_frame(void *ptr) 307 { 308 return (unsigned long)ptr & VIRTIO_XDP_FLAG; 309 } 310 311 static void *xdp_to_ptr(struct xdp_frame *ptr) 312 { 313 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); 314 } 315 316 static struct xdp_frame *ptr_to_xdp(void *ptr) 317 { 318 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); 319 } 320 321 /* Converting between virtqueue no. and kernel tx/rx queue no. 322 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 323 */ 324 static int vq2txq(struct virtqueue *vq) 325 { 326 return (vq->index - 1) / 2; 327 } 328 329 static int txq2vq(int txq) 330 { 331 return txq * 2 + 1; 332 } 333 334 static int vq2rxq(struct virtqueue *vq) 335 { 336 return vq->index / 2; 337 } 338 339 static int rxq2vq(int rxq) 340 { 341 return rxq * 2; 342 } 343 344 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 345 { 346 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 347 } 348 349 /* 350 * private is used to chain pages for big packets, put the whole 351 * most recent used list in the beginning for reuse 352 */ 353 static void give_pages(struct receive_queue *rq, struct page *page) 354 { 355 struct page *end; 356 357 /* Find end of list, sew whole thing into vi->rq.pages. */ 358 for (end = page; end->private; end = (struct page *)end->private); 359 end->private = (unsigned long)rq->pages; 360 rq->pages = page; 361 } 362 363 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 364 { 365 struct page *p = rq->pages; 366 367 if (p) { 368 rq->pages = (struct page *)p->private; 369 /* clear private here, it is used to chain pages */ 370 p->private = 0; 371 } else 372 p = alloc_page(gfp_mask); 373 return p; 374 } 375 376 static void enable_delayed_refill(struct virtnet_info *vi) 377 { 378 spin_lock_bh(&vi->refill_lock); 379 vi->refill_enabled = true; 380 spin_unlock_bh(&vi->refill_lock); 381 } 382 383 static void disable_delayed_refill(struct virtnet_info *vi) 384 { 385 spin_lock_bh(&vi->refill_lock); 386 vi->refill_enabled = false; 387 spin_unlock_bh(&vi->refill_lock); 388 } 389 390 static void virtqueue_napi_schedule(struct napi_struct *napi, 391 struct virtqueue *vq) 392 { 393 if (napi_schedule_prep(napi)) { 394 virtqueue_disable_cb(vq); 395 __napi_schedule(napi); 396 } 397 } 398 399 static void virtqueue_napi_complete(struct napi_struct *napi, 400 struct virtqueue *vq, int processed) 401 { 402 int opaque; 403 404 opaque = virtqueue_enable_cb_prepare(vq); 405 if (napi_complete_done(napi, processed)) { 406 if (unlikely(virtqueue_poll(vq, opaque))) 407 virtqueue_napi_schedule(napi, vq); 408 } else { 409 virtqueue_disable_cb(vq); 410 } 411 } 412 413 static void skb_xmit_done(struct virtqueue *vq) 414 { 415 struct virtnet_info *vi = vq->vdev->priv; 416 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; 417 418 /* Suppress further interrupts. */ 419 virtqueue_disable_cb(vq); 420 421 if (napi->weight) 422 virtqueue_napi_schedule(napi, vq); 423 else 424 /* We were probably waiting for more output buffers. */ 425 netif_wake_subqueue(vi->dev, vq2txq(vq)); 426 } 427 428 #define MRG_CTX_HEADER_SHIFT 22 429 static void *mergeable_len_to_ctx(unsigned int truesize, 430 unsigned int headroom) 431 { 432 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); 433 } 434 435 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) 436 { 437 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; 438 } 439 440 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) 441 { 442 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); 443 } 444 445 /* Called from bottom half context */ 446 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 447 struct receive_queue *rq, 448 struct page *page, unsigned int offset, 449 unsigned int len, unsigned int truesize) 450 { 451 struct sk_buff *skb; 452 struct virtio_net_hdr_mrg_rxbuf *hdr; 453 unsigned int copy, hdr_len, hdr_padded_len; 454 struct page *page_to_free = NULL; 455 int tailroom, shinfo_size; 456 char *p, *hdr_p, *buf; 457 458 p = page_address(page) + offset; 459 hdr_p = p; 460 461 hdr_len = vi->hdr_len; 462 if (vi->mergeable_rx_bufs) 463 hdr_padded_len = hdr_len; 464 else 465 hdr_padded_len = sizeof(struct padded_vnet_hdr); 466 467 buf = p; 468 len -= hdr_len; 469 offset += hdr_padded_len; 470 p += hdr_padded_len; 471 tailroom = truesize - hdr_padded_len - len; 472 473 shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 474 475 /* copy small packet so we can reuse these pages */ 476 if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) { 477 skb = build_skb(buf, truesize); 478 if (unlikely(!skb)) 479 return NULL; 480 481 skb_reserve(skb, p - buf); 482 skb_put(skb, len); 483 484 page = (struct page *)page->private; 485 if (page) 486 give_pages(rq, page); 487 goto ok; 488 } 489 490 /* copy small packet so we can reuse these pages for small data */ 491 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 492 if (unlikely(!skb)) 493 return NULL; 494 495 /* Copy all frame if it fits skb->head, otherwise 496 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed. 497 */ 498 if (len <= skb_tailroom(skb)) 499 copy = len; 500 else 501 copy = ETH_HLEN; 502 skb_put_data(skb, p, copy); 503 504 len -= copy; 505 offset += copy; 506 507 if (vi->mergeable_rx_bufs) { 508 if (len) 509 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 510 else 511 page_to_free = page; 512 goto ok; 513 } 514 515 /* 516 * Verify that we can indeed put this data into a skb. 517 * This is here to handle cases when the device erroneously 518 * tries to receive more than is possible. This is usually 519 * the case of a broken device. 520 */ 521 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 522 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 523 dev_kfree_skb(skb); 524 return NULL; 525 } 526 BUG_ON(offset >= PAGE_SIZE); 527 while (len) { 528 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 529 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 530 frag_size, truesize); 531 len -= frag_size; 532 page = (struct page *)page->private; 533 offset = 0; 534 } 535 536 if (page) 537 give_pages(rq, page); 538 539 ok: 540 hdr = skb_vnet_hdr(skb); 541 memcpy(hdr, hdr_p, hdr_len); 542 if (page_to_free) 543 put_page(page_to_free); 544 545 return skb; 546 } 547 548 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, 549 struct send_queue *sq, 550 struct xdp_frame *xdpf) 551 { 552 struct virtio_net_hdr_mrg_rxbuf *hdr; 553 struct skb_shared_info *shinfo; 554 u8 nr_frags = 0; 555 int err, i; 556 557 if (unlikely(xdpf->headroom < vi->hdr_len)) 558 return -EOVERFLOW; 559 560 if (unlikely(xdp_frame_has_frags(xdpf))) { 561 shinfo = xdp_get_shared_info_from_frame(xdpf); 562 nr_frags = shinfo->nr_frags; 563 } 564 565 /* In wrapping function virtnet_xdp_xmit(), we need to free 566 * up the pending old buffers, where we need to calculate the 567 * position of skb_shared_info in xdp_get_frame_len() and 568 * xdp_return_frame(), which will involve to xdpf->data and 569 * xdpf->headroom. Therefore, we need to update the value of 570 * headroom synchronously here. 571 */ 572 xdpf->headroom -= vi->hdr_len; 573 xdpf->data -= vi->hdr_len; 574 /* Zero header and leave csum up to XDP layers */ 575 hdr = xdpf->data; 576 memset(hdr, 0, vi->hdr_len); 577 xdpf->len += vi->hdr_len; 578 579 sg_init_table(sq->sg, nr_frags + 1); 580 sg_set_buf(sq->sg, xdpf->data, xdpf->len); 581 for (i = 0; i < nr_frags; i++) { 582 skb_frag_t *frag = &shinfo->frags[i]; 583 584 sg_set_page(&sq->sg[i + 1], skb_frag_page(frag), 585 skb_frag_size(frag), skb_frag_off(frag)); 586 } 587 588 err = virtqueue_add_outbuf(sq->vq, sq->sg, nr_frags + 1, 589 xdp_to_ptr(xdpf), GFP_ATOMIC); 590 if (unlikely(err)) 591 return -ENOSPC; /* Caller handle free/refcnt */ 592 593 return 0; 594 } 595 596 /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on 597 * the current cpu, so it does not need to be locked. 598 * 599 * Here we use marco instead of inline functions because we have to deal with 600 * three issues at the same time: 1. the choice of sq. 2. judge and execute the 601 * lock/unlock of txq 3. make sparse happy. It is difficult for two inline 602 * functions to perfectly solve these three problems at the same time. 603 */ 604 #define virtnet_xdp_get_sq(vi) ({ \ 605 int cpu = smp_processor_id(); \ 606 struct netdev_queue *txq; \ 607 typeof(vi) v = (vi); \ 608 unsigned int qp; \ 609 \ 610 if (v->curr_queue_pairs > nr_cpu_ids) { \ 611 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ 612 qp += cpu; \ 613 txq = netdev_get_tx_queue(v->dev, qp); \ 614 __netif_tx_acquire(txq); \ 615 } else { \ 616 qp = cpu % v->curr_queue_pairs; \ 617 txq = netdev_get_tx_queue(v->dev, qp); \ 618 __netif_tx_lock(txq, cpu); \ 619 } \ 620 v->sq + qp; \ 621 }) 622 623 #define virtnet_xdp_put_sq(vi, q) { \ 624 struct netdev_queue *txq; \ 625 typeof(vi) v = (vi); \ 626 \ 627 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \ 628 if (v->curr_queue_pairs > nr_cpu_ids) \ 629 __netif_tx_release(txq); \ 630 else \ 631 __netif_tx_unlock(txq); \ 632 } 633 634 static int virtnet_xdp_xmit(struct net_device *dev, 635 int n, struct xdp_frame **frames, u32 flags) 636 { 637 struct virtnet_info *vi = netdev_priv(dev); 638 struct receive_queue *rq = vi->rq; 639 struct bpf_prog *xdp_prog; 640 struct send_queue *sq; 641 unsigned int len; 642 int packets = 0; 643 int bytes = 0; 644 int nxmit = 0; 645 int kicks = 0; 646 void *ptr; 647 int ret; 648 int i; 649 650 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this 651 * indicate XDP resources have been successfully allocated. 652 */ 653 xdp_prog = rcu_access_pointer(rq->xdp_prog); 654 if (!xdp_prog) 655 return -ENXIO; 656 657 sq = virtnet_xdp_get_sq(vi); 658 659 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { 660 ret = -EINVAL; 661 goto out; 662 } 663 664 /* Free up any pending old buffers before queueing new ones. */ 665 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 666 if (likely(is_xdp_frame(ptr))) { 667 struct xdp_frame *frame = ptr_to_xdp(ptr); 668 669 bytes += xdp_get_frame_len(frame); 670 xdp_return_frame(frame); 671 } else { 672 struct sk_buff *skb = ptr; 673 674 bytes += skb->len; 675 napi_consume_skb(skb, false); 676 } 677 packets++; 678 } 679 680 for (i = 0; i < n; i++) { 681 struct xdp_frame *xdpf = frames[i]; 682 683 if (__virtnet_xdp_xmit_one(vi, sq, xdpf)) 684 break; 685 nxmit++; 686 } 687 ret = nxmit; 688 689 if (flags & XDP_XMIT_FLUSH) { 690 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 691 kicks = 1; 692 } 693 out: 694 u64_stats_update_begin(&sq->stats.syncp); 695 sq->stats.bytes += bytes; 696 sq->stats.packets += packets; 697 sq->stats.xdp_tx += n; 698 sq->stats.xdp_tx_drops += n - nxmit; 699 sq->stats.kicks += kicks; 700 u64_stats_update_end(&sq->stats.syncp); 701 702 virtnet_xdp_put_sq(vi, sq); 703 return ret; 704 } 705 706 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 707 { 708 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0; 709 } 710 711 /* We copy the packet for XDP in the following cases: 712 * 713 * 1) Packet is scattered across multiple rx buffers. 714 * 2) Headroom space is insufficient. 715 * 716 * This is inefficient but it's a temporary condition that 717 * we hit right after XDP is enabled and until queue is refilled 718 * with large buffers with sufficient headroom - so it should affect 719 * at most queue size packets. 720 * Afterwards, the conditions to enable 721 * XDP should preclude the underlying device from sending packets 722 * across multiple buffers (num_buf > 1), and we make sure buffers 723 * have enough headroom. 724 */ 725 static struct page *xdp_linearize_page(struct receive_queue *rq, 726 int *num_buf, 727 struct page *p, 728 int offset, 729 int page_off, 730 unsigned int *len) 731 { 732 struct page *page = alloc_page(GFP_ATOMIC); 733 734 if (!page) 735 return NULL; 736 737 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 738 page_off += *len; 739 740 while (--*num_buf) { 741 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 742 unsigned int buflen; 743 void *buf; 744 int off; 745 746 buf = virtqueue_get_buf(rq->vq, &buflen); 747 if (unlikely(!buf)) 748 goto err_buf; 749 750 p = virt_to_head_page(buf); 751 off = buf - page_address(p); 752 753 /* guard against a misconfigured or uncooperative backend that 754 * is sending packet larger than the MTU. 755 */ 756 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 757 put_page(p); 758 goto err_buf; 759 } 760 761 memcpy(page_address(page) + page_off, 762 page_address(p) + off, buflen); 763 page_off += buflen; 764 put_page(p); 765 } 766 767 /* Headroom does not contribute to packet length */ 768 *len = page_off - VIRTIO_XDP_HEADROOM; 769 return page; 770 err_buf: 771 __free_pages(page, 0); 772 return NULL; 773 } 774 775 static struct sk_buff *receive_small(struct net_device *dev, 776 struct virtnet_info *vi, 777 struct receive_queue *rq, 778 void *buf, void *ctx, 779 unsigned int len, 780 unsigned int *xdp_xmit, 781 struct virtnet_rq_stats *stats) 782 { 783 struct sk_buff *skb; 784 struct bpf_prog *xdp_prog; 785 unsigned int xdp_headroom = (unsigned long)ctx; 786 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 787 unsigned int headroom = vi->hdr_len + header_offset; 788 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 789 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 790 struct page *page = virt_to_head_page(buf); 791 unsigned int delta = 0; 792 struct page *xdp_page; 793 int err; 794 unsigned int metasize = 0; 795 796 len -= vi->hdr_len; 797 stats->bytes += len; 798 799 if (unlikely(len > GOOD_PACKET_LEN)) { 800 pr_debug("%s: rx error: len %u exceeds max size %d\n", 801 dev->name, len, GOOD_PACKET_LEN); 802 dev->stats.rx_length_errors++; 803 goto err; 804 } 805 806 if (likely(!vi->xdp_enabled)) { 807 xdp_prog = NULL; 808 goto skip_xdp; 809 } 810 811 rcu_read_lock(); 812 xdp_prog = rcu_dereference(rq->xdp_prog); 813 if (xdp_prog) { 814 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 815 struct xdp_frame *xdpf; 816 struct xdp_buff xdp; 817 void *orig_data; 818 u32 act; 819 820 if (unlikely(hdr->hdr.gso_type)) 821 goto err_xdp; 822 823 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 824 int offset = buf - page_address(page) + header_offset; 825 unsigned int tlen = len + vi->hdr_len; 826 int num_buf = 1; 827 828 xdp_headroom = virtnet_get_headroom(vi); 829 header_offset = VIRTNET_RX_PAD + xdp_headroom; 830 headroom = vi->hdr_len + header_offset; 831 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 832 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 833 xdp_page = xdp_linearize_page(rq, &num_buf, page, 834 offset, header_offset, 835 &tlen); 836 if (!xdp_page) 837 goto err_xdp; 838 839 buf = page_address(xdp_page); 840 put_page(page); 841 page = xdp_page; 842 } 843 844 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); 845 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, 846 xdp_headroom, len, true); 847 orig_data = xdp.data; 848 act = bpf_prog_run_xdp(xdp_prog, &xdp); 849 stats->xdp_packets++; 850 851 switch (act) { 852 case XDP_PASS: 853 /* Recalculate length in case bpf program changed it */ 854 delta = orig_data - xdp.data; 855 len = xdp.data_end - xdp.data; 856 metasize = xdp.data - xdp.data_meta; 857 break; 858 case XDP_TX: 859 stats->xdp_tx++; 860 xdpf = xdp_convert_buff_to_frame(&xdp); 861 if (unlikely(!xdpf)) 862 goto err_xdp; 863 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 864 if (unlikely(!err)) { 865 xdp_return_frame_rx_napi(xdpf); 866 } else if (unlikely(err < 0)) { 867 trace_xdp_exception(vi->dev, xdp_prog, act); 868 goto err_xdp; 869 } 870 *xdp_xmit |= VIRTIO_XDP_TX; 871 rcu_read_unlock(); 872 goto xdp_xmit; 873 case XDP_REDIRECT: 874 stats->xdp_redirects++; 875 err = xdp_do_redirect(dev, &xdp, xdp_prog); 876 if (err) 877 goto err_xdp; 878 *xdp_xmit |= VIRTIO_XDP_REDIR; 879 rcu_read_unlock(); 880 goto xdp_xmit; 881 default: 882 bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); 883 fallthrough; 884 case XDP_ABORTED: 885 trace_xdp_exception(vi->dev, xdp_prog, act); 886 goto err_xdp; 887 case XDP_DROP: 888 goto err_xdp; 889 } 890 } 891 rcu_read_unlock(); 892 893 skip_xdp: 894 skb = build_skb(buf, buflen); 895 if (!skb) 896 goto err; 897 skb_reserve(skb, headroom - delta); 898 skb_put(skb, len); 899 if (!xdp_prog) { 900 buf += header_offset; 901 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 902 } /* keep zeroed vnet hdr since XDP is loaded */ 903 904 if (metasize) 905 skb_metadata_set(skb, metasize); 906 907 return skb; 908 909 err_xdp: 910 rcu_read_unlock(); 911 stats->xdp_drops++; 912 err: 913 stats->drops++; 914 put_page(page); 915 xdp_xmit: 916 return NULL; 917 } 918 919 static struct sk_buff *receive_big(struct net_device *dev, 920 struct virtnet_info *vi, 921 struct receive_queue *rq, 922 void *buf, 923 unsigned int len, 924 struct virtnet_rq_stats *stats) 925 { 926 struct page *page = buf; 927 struct sk_buff *skb = 928 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE); 929 930 stats->bytes += len - vi->hdr_len; 931 if (unlikely(!skb)) 932 goto err; 933 934 return skb; 935 936 err: 937 stats->drops++; 938 give_pages(rq, page); 939 return NULL; 940 } 941 942 /* Why not use xdp_build_skb_from_frame() ? 943 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in 944 * virtio-net there are 2 points that do not match its requirements: 945 * 1. The size of the prefilled buffer is not fixed before xdp is set. 946 * 2. xdp_build_skb_from_frame() does more checks that we don't need, 947 * like eth_type_trans() (which virtio-net does in receive_buf()). 948 */ 949 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev, 950 struct virtnet_info *vi, 951 struct xdp_buff *xdp, 952 unsigned int xdp_frags_truesz) 953 { 954 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 955 unsigned int headroom, data_len; 956 struct sk_buff *skb; 957 int metasize; 958 u8 nr_frags; 959 960 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 961 pr_debug("Error building skb as missing reserved tailroom for xdp"); 962 return NULL; 963 } 964 965 if (unlikely(xdp_buff_has_frags(xdp))) 966 nr_frags = sinfo->nr_frags; 967 968 skb = build_skb(xdp->data_hard_start, xdp->frame_sz); 969 if (unlikely(!skb)) 970 return NULL; 971 972 headroom = xdp->data - xdp->data_hard_start; 973 data_len = xdp->data_end - xdp->data; 974 skb_reserve(skb, headroom); 975 __skb_put(skb, data_len); 976 977 metasize = xdp->data - xdp->data_meta; 978 metasize = metasize > 0 ? metasize : 0; 979 if (metasize) 980 skb_metadata_set(skb, metasize); 981 982 if (unlikely(xdp_buff_has_frags(xdp))) 983 xdp_update_skb_shared_info(skb, nr_frags, 984 sinfo->xdp_frags_size, 985 xdp_frags_truesz, 986 xdp_buff_is_frag_pfmemalloc(xdp)); 987 988 return skb; 989 } 990 991 /* TODO: build xdp in big mode */ 992 static int virtnet_build_xdp_buff_mrg(struct net_device *dev, 993 struct virtnet_info *vi, 994 struct receive_queue *rq, 995 struct xdp_buff *xdp, 996 void *buf, 997 unsigned int len, 998 unsigned int frame_sz, 999 int *num_buf, 1000 unsigned int *xdp_frags_truesize, 1001 struct virtnet_rq_stats *stats) 1002 { 1003 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1004 unsigned int headroom, tailroom, room; 1005 unsigned int truesize, cur_frag_size; 1006 struct skb_shared_info *shinfo; 1007 unsigned int xdp_frags_truesz = 0; 1008 struct page *page; 1009 skb_frag_t *frag; 1010 int offset; 1011 void *ctx; 1012 1013 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); 1014 xdp_prepare_buff(xdp, buf - VIRTIO_XDP_HEADROOM, 1015 VIRTIO_XDP_HEADROOM + vi->hdr_len, len - vi->hdr_len, true); 1016 1017 if (!*num_buf) 1018 return 0; 1019 1020 if (*num_buf > 1) { 1021 /* If we want to build multi-buffer xdp, we need 1022 * to specify that the flags of xdp_buff have the 1023 * XDP_FLAGS_HAS_FRAG bit. 1024 */ 1025 if (!xdp_buff_has_frags(xdp)) 1026 xdp_buff_set_frags_flag(xdp); 1027 1028 shinfo = xdp_get_shared_info_from_buff(xdp); 1029 shinfo->nr_frags = 0; 1030 shinfo->xdp_frags_size = 0; 1031 } 1032 1033 if (*num_buf > MAX_SKB_FRAGS + 1) 1034 return -EINVAL; 1035 1036 while (--*num_buf > 0) { 1037 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1038 if (unlikely(!buf)) { 1039 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1040 dev->name, *num_buf, 1041 virtio16_to_cpu(vi->vdev, hdr->num_buffers)); 1042 dev->stats.rx_length_errors++; 1043 return -EINVAL; 1044 } 1045 1046 stats->bytes += len; 1047 page = virt_to_head_page(buf); 1048 offset = buf - page_address(page); 1049 1050 truesize = mergeable_ctx_to_truesize(ctx); 1051 headroom = mergeable_ctx_to_headroom(ctx); 1052 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1053 room = SKB_DATA_ALIGN(headroom + tailroom); 1054 1055 cur_frag_size = truesize; 1056 xdp_frags_truesz += cur_frag_size; 1057 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) { 1058 put_page(page); 1059 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1060 dev->name, len, (unsigned long)(truesize - room)); 1061 dev->stats.rx_length_errors++; 1062 return -EINVAL; 1063 } 1064 1065 frag = &shinfo->frags[shinfo->nr_frags++]; 1066 __skb_frag_set_page(frag, page); 1067 skb_frag_off_set(frag, offset); 1068 skb_frag_size_set(frag, len); 1069 if (page_is_pfmemalloc(page)) 1070 xdp_buff_set_frag_pfmemalloc(xdp); 1071 1072 shinfo->xdp_frags_size += len; 1073 } 1074 1075 *xdp_frags_truesize = xdp_frags_truesz; 1076 return 0; 1077 } 1078 1079 static struct sk_buff *receive_mergeable(struct net_device *dev, 1080 struct virtnet_info *vi, 1081 struct receive_queue *rq, 1082 void *buf, 1083 void *ctx, 1084 unsigned int len, 1085 unsigned int *xdp_xmit, 1086 struct virtnet_rq_stats *stats) 1087 { 1088 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1089 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 1090 struct page *page = virt_to_head_page(buf); 1091 int offset = buf - page_address(page); 1092 struct sk_buff *head_skb, *curr_skb; 1093 struct bpf_prog *xdp_prog; 1094 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1095 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1096 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1097 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1098 unsigned int frame_sz, xdp_room; 1099 int err; 1100 1101 head_skb = NULL; 1102 stats->bytes += len - vi->hdr_len; 1103 1104 if (unlikely(len > truesize - room)) { 1105 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1106 dev->name, len, (unsigned long)(truesize - room)); 1107 dev->stats.rx_length_errors++; 1108 goto err_skb; 1109 } 1110 1111 if (likely(!vi->xdp_enabled)) { 1112 xdp_prog = NULL; 1113 goto skip_xdp; 1114 } 1115 1116 rcu_read_lock(); 1117 xdp_prog = rcu_dereference(rq->xdp_prog); 1118 if (xdp_prog) { 1119 unsigned int xdp_frags_truesz = 0; 1120 struct skb_shared_info *shinfo; 1121 struct xdp_frame *xdpf; 1122 struct page *xdp_page; 1123 struct xdp_buff xdp; 1124 void *data; 1125 u32 act; 1126 int i; 1127 1128 /* Transient failure which in theory could occur if 1129 * in-flight packets from before XDP was enabled reach 1130 * the receive path after XDP is loaded. 1131 */ 1132 if (unlikely(hdr->hdr.gso_type)) 1133 goto err_xdp; 1134 1135 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers 1136 * with headroom may add hole in truesize, which 1137 * make their length exceed PAGE_SIZE. So we disabled the 1138 * hole mechanism for xdp. See add_recvbuf_mergeable(). 1139 */ 1140 frame_sz = truesize; 1141 1142 /* This happens when headroom is not enough because 1143 * of the buffer was prefilled before XDP is set. 1144 * This should only happen for the first several packets. 1145 * In fact, vq reset can be used here to help us clean up 1146 * the prefilled buffers, but many existing devices do not 1147 * support it, and we don't want to bother users who are 1148 * using xdp normally. 1149 */ 1150 if (!xdp_prog->aux->xdp_has_frags && 1151 (num_buf > 1 || headroom < virtnet_get_headroom(vi))) { 1152 /* linearize data for XDP */ 1153 xdp_page = xdp_linearize_page(rq, &num_buf, 1154 page, offset, 1155 VIRTIO_XDP_HEADROOM, 1156 &len); 1157 frame_sz = PAGE_SIZE; 1158 1159 if (!xdp_page) 1160 goto err_xdp; 1161 offset = VIRTIO_XDP_HEADROOM; 1162 } else if (unlikely(headroom < virtnet_get_headroom(vi))) { 1163 xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 1164 sizeof(struct skb_shared_info)); 1165 if (len + xdp_room > PAGE_SIZE) 1166 goto err_xdp; 1167 1168 xdp_page = alloc_page(GFP_ATOMIC); 1169 if (!xdp_page) 1170 goto err_xdp; 1171 1172 memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM, 1173 page_address(page) + offset, len); 1174 frame_sz = PAGE_SIZE; 1175 offset = VIRTIO_XDP_HEADROOM; 1176 } else { 1177 xdp_page = page; 1178 } 1179 1180 data = page_address(xdp_page) + offset; 1181 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz, 1182 &num_buf, &xdp_frags_truesz, stats); 1183 if (unlikely(err)) 1184 goto err_xdp_frags; 1185 1186 act = bpf_prog_run_xdp(xdp_prog, &xdp); 1187 stats->xdp_packets++; 1188 1189 switch (act) { 1190 case XDP_PASS: 1191 if (unlikely(xdp_page != page)) 1192 put_page(page); 1193 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); 1194 rcu_read_unlock(); 1195 return head_skb; 1196 case XDP_TX: 1197 stats->xdp_tx++; 1198 xdpf = xdp_convert_buff_to_frame(&xdp); 1199 if (unlikely(!xdpf)) { 1200 netdev_dbg(dev, "convert buff to frame failed for xdp\n"); 1201 goto err_xdp_frags; 1202 } 1203 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 1204 if (unlikely(!err)) { 1205 xdp_return_frame_rx_napi(xdpf); 1206 } else if (unlikely(err < 0)) { 1207 trace_xdp_exception(vi->dev, xdp_prog, act); 1208 goto err_xdp_frags; 1209 } 1210 *xdp_xmit |= VIRTIO_XDP_TX; 1211 if (unlikely(xdp_page != page)) 1212 put_page(page); 1213 rcu_read_unlock(); 1214 goto xdp_xmit; 1215 case XDP_REDIRECT: 1216 stats->xdp_redirects++; 1217 err = xdp_do_redirect(dev, &xdp, xdp_prog); 1218 if (err) 1219 goto err_xdp_frags; 1220 *xdp_xmit |= VIRTIO_XDP_REDIR; 1221 if (unlikely(xdp_page != page)) 1222 put_page(page); 1223 rcu_read_unlock(); 1224 goto xdp_xmit; 1225 default: 1226 bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); 1227 fallthrough; 1228 case XDP_ABORTED: 1229 trace_xdp_exception(vi->dev, xdp_prog, act); 1230 fallthrough; 1231 case XDP_DROP: 1232 goto err_xdp_frags; 1233 } 1234 err_xdp_frags: 1235 if (unlikely(xdp_page != page)) 1236 __free_pages(xdp_page, 0); 1237 1238 if (xdp_buff_has_frags(&xdp)) { 1239 shinfo = xdp_get_shared_info_from_buff(&xdp); 1240 for (i = 0; i < shinfo->nr_frags; i++) { 1241 xdp_page = skb_frag_page(&shinfo->frags[i]); 1242 put_page(xdp_page); 1243 } 1244 } 1245 1246 goto err_xdp; 1247 } 1248 rcu_read_unlock(); 1249 1250 skip_xdp: 1251 head_skb = page_to_skb(vi, rq, page, offset, len, truesize); 1252 curr_skb = head_skb; 1253 1254 if (unlikely(!curr_skb)) 1255 goto err_skb; 1256 while (--num_buf) { 1257 int num_skb_frags; 1258 1259 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1260 if (unlikely(!buf)) { 1261 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1262 dev->name, num_buf, 1263 virtio16_to_cpu(vi->vdev, 1264 hdr->num_buffers)); 1265 dev->stats.rx_length_errors++; 1266 goto err_buf; 1267 } 1268 1269 stats->bytes += len; 1270 page = virt_to_head_page(buf); 1271 1272 truesize = mergeable_ctx_to_truesize(ctx); 1273 headroom = mergeable_ctx_to_headroom(ctx); 1274 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1275 room = SKB_DATA_ALIGN(headroom + tailroom); 1276 if (unlikely(len > truesize - room)) { 1277 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1278 dev->name, len, (unsigned long)(truesize - room)); 1279 dev->stats.rx_length_errors++; 1280 goto err_skb; 1281 } 1282 1283 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 1284 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 1285 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 1286 1287 if (unlikely(!nskb)) 1288 goto err_skb; 1289 if (curr_skb == head_skb) 1290 skb_shinfo(curr_skb)->frag_list = nskb; 1291 else 1292 curr_skb->next = nskb; 1293 curr_skb = nskb; 1294 head_skb->truesize += nskb->truesize; 1295 num_skb_frags = 0; 1296 } 1297 if (curr_skb != head_skb) { 1298 head_skb->data_len += len; 1299 head_skb->len += len; 1300 head_skb->truesize += truesize; 1301 } 1302 offset = buf - page_address(page); 1303 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 1304 put_page(page); 1305 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 1306 len, truesize); 1307 } else { 1308 skb_add_rx_frag(curr_skb, num_skb_frags, page, 1309 offset, len, truesize); 1310 } 1311 } 1312 1313 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 1314 return head_skb; 1315 1316 err_xdp: 1317 rcu_read_unlock(); 1318 stats->xdp_drops++; 1319 err_skb: 1320 put_page(page); 1321 while (num_buf-- > 1) { 1322 buf = virtqueue_get_buf(rq->vq, &len); 1323 if (unlikely(!buf)) { 1324 pr_debug("%s: rx error: %d buffers missing\n", 1325 dev->name, num_buf); 1326 dev->stats.rx_length_errors++; 1327 break; 1328 } 1329 stats->bytes += len; 1330 page = virt_to_head_page(buf); 1331 put_page(page); 1332 } 1333 err_buf: 1334 stats->drops++; 1335 dev_kfree_skb(head_skb); 1336 xdp_xmit: 1337 return NULL; 1338 } 1339 1340 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash, 1341 struct sk_buff *skb) 1342 { 1343 enum pkt_hash_types rss_hash_type; 1344 1345 if (!hdr_hash || !skb) 1346 return; 1347 1348 switch (__le16_to_cpu(hdr_hash->hash_report)) { 1349 case VIRTIO_NET_HASH_REPORT_TCPv4: 1350 case VIRTIO_NET_HASH_REPORT_UDPv4: 1351 case VIRTIO_NET_HASH_REPORT_TCPv6: 1352 case VIRTIO_NET_HASH_REPORT_UDPv6: 1353 case VIRTIO_NET_HASH_REPORT_TCPv6_EX: 1354 case VIRTIO_NET_HASH_REPORT_UDPv6_EX: 1355 rss_hash_type = PKT_HASH_TYPE_L4; 1356 break; 1357 case VIRTIO_NET_HASH_REPORT_IPv4: 1358 case VIRTIO_NET_HASH_REPORT_IPv6: 1359 case VIRTIO_NET_HASH_REPORT_IPv6_EX: 1360 rss_hash_type = PKT_HASH_TYPE_L3; 1361 break; 1362 case VIRTIO_NET_HASH_REPORT_NONE: 1363 default: 1364 rss_hash_type = PKT_HASH_TYPE_NONE; 1365 } 1366 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type); 1367 } 1368 1369 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 1370 void *buf, unsigned int len, void **ctx, 1371 unsigned int *xdp_xmit, 1372 struct virtnet_rq_stats *stats) 1373 { 1374 struct net_device *dev = vi->dev; 1375 struct sk_buff *skb; 1376 struct virtio_net_hdr_mrg_rxbuf *hdr; 1377 1378 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1379 pr_debug("%s: short packet %i\n", dev->name, len); 1380 dev->stats.rx_length_errors++; 1381 virtnet_rq_free_unused_buf(rq->vq, buf); 1382 return; 1383 } 1384 1385 if (vi->mergeable_rx_bufs) 1386 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1387 stats); 1388 else if (vi->big_packets) 1389 skb = receive_big(dev, vi, rq, buf, len, stats); 1390 else 1391 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1392 1393 if (unlikely(!skb)) 1394 return; 1395 1396 hdr = skb_vnet_hdr(skb); 1397 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report) 1398 virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb); 1399 1400 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1401 skb->ip_summed = CHECKSUM_UNNECESSARY; 1402 1403 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1404 virtio_is_little_endian(vi->vdev))) { 1405 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1406 dev->name, hdr->hdr.gso_type, 1407 hdr->hdr.gso_size); 1408 goto frame_err; 1409 } 1410 1411 skb_record_rx_queue(skb, vq2rxq(rq->vq)); 1412 skb->protocol = eth_type_trans(skb, dev); 1413 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1414 ntohs(skb->protocol), skb->len, skb->pkt_type); 1415 1416 napi_gro_receive(&rq->napi, skb); 1417 return; 1418 1419 frame_err: 1420 dev->stats.rx_frame_errors++; 1421 dev_kfree_skb(skb); 1422 } 1423 1424 /* Unlike mergeable buffers, all buffers are allocated to the 1425 * same size, except for the headroom. For this reason we do 1426 * not need to use mergeable_len_to_ctx here - it is enough 1427 * to store the headroom as the context ignoring the truesize. 1428 */ 1429 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1430 gfp_t gfp) 1431 { 1432 struct page_frag *alloc_frag = &rq->alloc_frag; 1433 char *buf; 1434 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1435 void *ctx = (void *)(unsigned long)xdp_headroom; 1436 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1437 int err; 1438 1439 len = SKB_DATA_ALIGN(len) + 1440 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1441 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1442 return -ENOMEM; 1443 1444 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1445 get_page(alloc_frag->page); 1446 alloc_frag->offset += len; 1447 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1448 vi->hdr_len + GOOD_PACKET_LEN); 1449 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1450 if (err < 0) 1451 put_page(virt_to_head_page(buf)); 1452 return err; 1453 } 1454 1455 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1456 gfp_t gfp) 1457 { 1458 struct page *first, *list = NULL; 1459 char *p; 1460 int i, err, offset; 1461 1462 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2); 1463 1464 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */ 1465 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) { 1466 first = get_a_page(rq, gfp); 1467 if (!first) { 1468 if (list) 1469 give_pages(rq, list); 1470 return -ENOMEM; 1471 } 1472 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1473 1474 /* chain new page in list head to match sg */ 1475 first->private = (unsigned long)list; 1476 list = first; 1477 } 1478 1479 first = get_a_page(rq, gfp); 1480 if (!first) { 1481 give_pages(rq, list); 1482 return -ENOMEM; 1483 } 1484 p = page_address(first); 1485 1486 /* rq->sg[0], rq->sg[1] share the same page */ 1487 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1488 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1489 1490 /* rq->sg[1] for data packet, from offset */ 1491 offset = sizeof(struct padded_vnet_hdr); 1492 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1493 1494 /* chain first in list head */ 1495 first->private = (unsigned long)list; 1496 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2, 1497 first, gfp); 1498 if (err < 0) 1499 give_pages(rq, first); 1500 1501 return err; 1502 } 1503 1504 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1505 struct ewma_pkt_len *avg_pkt_len, 1506 unsigned int room) 1507 { 1508 struct virtnet_info *vi = rq->vq->vdev->priv; 1509 const size_t hdr_len = vi->hdr_len; 1510 unsigned int len; 1511 1512 if (room) 1513 return PAGE_SIZE - room; 1514 1515 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1516 rq->min_buf_len, PAGE_SIZE - hdr_len); 1517 1518 return ALIGN(len, L1_CACHE_BYTES); 1519 } 1520 1521 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1522 struct receive_queue *rq, gfp_t gfp) 1523 { 1524 struct page_frag *alloc_frag = &rq->alloc_frag; 1525 unsigned int headroom = virtnet_get_headroom(vi); 1526 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1527 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1528 char *buf; 1529 void *ctx; 1530 int err; 1531 unsigned int len, hole; 1532 1533 /* Extra tailroom is needed to satisfy XDP's assumption. This 1534 * means rx frags coalescing won't work, but consider we've 1535 * disabled GSO for XDP, it won't be a big issue. 1536 */ 1537 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1538 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1539 return -ENOMEM; 1540 1541 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1542 buf += headroom; /* advance address leaving hole at front of pkt */ 1543 get_page(alloc_frag->page); 1544 alloc_frag->offset += len + room; 1545 hole = alloc_frag->size - alloc_frag->offset; 1546 if (hole < len + room) { 1547 /* To avoid internal fragmentation, if there is very likely not 1548 * enough space for another buffer, add the remaining space to 1549 * the current buffer. 1550 * XDP core assumes that frame_size of xdp_buff and the length 1551 * of the frag are PAGE_SIZE, so we disable the hole mechanism. 1552 */ 1553 if (!headroom) 1554 len += hole; 1555 alloc_frag->offset += hole; 1556 } 1557 1558 sg_init_one(rq->sg, buf, len); 1559 ctx = mergeable_len_to_ctx(len + room, headroom); 1560 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1561 if (err < 0) 1562 put_page(virt_to_head_page(buf)); 1563 1564 return err; 1565 } 1566 1567 /* 1568 * Returns false if we couldn't fill entirely (OOM). 1569 * 1570 * Normally run in the receive path, but can also be run from ndo_open 1571 * before we're receiving packets, or from refill_work which is 1572 * careful to disable receiving (using napi_disable). 1573 */ 1574 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1575 gfp_t gfp) 1576 { 1577 int err; 1578 bool oom; 1579 1580 do { 1581 if (vi->mergeable_rx_bufs) 1582 err = add_recvbuf_mergeable(vi, rq, gfp); 1583 else if (vi->big_packets) 1584 err = add_recvbuf_big(vi, rq, gfp); 1585 else 1586 err = add_recvbuf_small(vi, rq, gfp); 1587 1588 oom = err == -ENOMEM; 1589 if (err) 1590 break; 1591 } while (rq->vq->num_free); 1592 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1593 unsigned long flags; 1594 1595 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); 1596 rq->stats.kicks++; 1597 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); 1598 } 1599 1600 return !oom; 1601 } 1602 1603 static void skb_recv_done(struct virtqueue *rvq) 1604 { 1605 struct virtnet_info *vi = rvq->vdev->priv; 1606 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1607 1608 virtqueue_napi_schedule(&rq->napi, rvq); 1609 } 1610 1611 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1612 { 1613 napi_enable(napi); 1614 1615 /* If all buffers were filled by other side before we napi_enabled, we 1616 * won't get another interrupt, so process any outstanding packets now. 1617 * Call local_bh_enable after to trigger softIRQ processing. 1618 */ 1619 local_bh_disable(); 1620 virtqueue_napi_schedule(napi, vq); 1621 local_bh_enable(); 1622 } 1623 1624 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1625 struct virtqueue *vq, 1626 struct napi_struct *napi) 1627 { 1628 if (!napi->weight) 1629 return; 1630 1631 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1632 * enable the feature if this is likely affine with the transmit path. 1633 */ 1634 if (!vi->affinity_hint_set) { 1635 napi->weight = 0; 1636 return; 1637 } 1638 1639 return virtnet_napi_enable(vq, napi); 1640 } 1641 1642 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1643 { 1644 if (napi->weight) 1645 napi_disable(napi); 1646 } 1647 1648 static void refill_work(struct work_struct *work) 1649 { 1650 struct virtnet_info *vi = 1651 container_of(work, struct virtnet_info, refill.work); 1652 bool still_empty; 1653 int i; 1654 1655 for (i = 0; i < vi->curr_queue_pairs; i++) { 1656 struct receive_queue *rq = &vi->rq[i]; 1657 1658 napi_disable(&rq->napi); 1659 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1660 virtnet_napi_enable(rq->vq, &rq->napi); 1661 1662 /* In theory, this can happen: if we don't get any buffers in 1663 * we will *never* try to fill again. 1664 */ 1665 if (still_empty) 1666 schedule_delayed_work(&vi->refill, HZ/2); 1667 } 1668 } 1669 1670 static int virtnet_receive(struct receive_queue *rq, int budget, 1671 unsigned int *xdp_xmit) 1672 { 1673 struct virtnet_info *vi = rq->vq->vdev->priv; 1674 struct virtnet_rq_stats stats = {}; 1675 unsigned int len; 1676 void *buf; 1677 int i; 1678 1679 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1680 void *ctx; 1681 1682 while (stats.packets < budget && 1683 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1684 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1685 stats.packets++; 1686 } 1687 } else { 1688 while (stats.packets < budget && 1689 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1690 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1691 stats.packets++; 1692 } 1693 } 1694 1695 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { 1696 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { 1697 spin_lock(&vi->refill_lock); 1698 if (vi->refill_enabled) 1699 schedule_delayed_work(&vi->refill, 0); 1700 spin_unlock(&vi->refill_lock); 1701 } 1702 } 1703 1704 u64_stats_update_begin(&rq->stats.syncp); 1705 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1706 size_t offset = virtnet_rq_stats_desc[i].offset; 1707 u64 *item; 1708 1709 item = (u64 *)((u8 *)&rq->stats + offset); 1710 *item += *(u64 *)((u8 *)&stats + offset); 1711 } 1712 u64_stats_update_end(&rq->stats.syncp); 1713 1714 return stats.packets; 1715 } 1716 1717 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) 1718 { 1719 unsigned int len; 1720 unsigned int packets = 0; 1721 unsigned int bytes = 0; 1722 void *ptr; 1723 1724 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 1725 if (likely(!is_xdp_frame(ptr))) { 1726 struct sk_buff *skb = ptr; 1727 1728 pr_debug("Sent skb %p\n", skb); 1729 1730 bytes += skb->len; 1731 napi_consume_skb(skb, in_napi); 1732 } else { 1733 struct xdp_frame *frame = ptr_to_xdp(ptr); 1734 1735 bytes += xdp_get_frame_len(frame); 1736 xdp_return_frame(frame); 1737 } 1738 packets++; 1739 } 1740 1741 /* Avoid overhead when no packets have been processed 1742 * happens when called speculatively from start_xmit. 1743 */ 1744 if (!packets) 1745 return; 1746 1747 u64_stats_update_begin(&sq->stats.syncp); 1748 sq->stats.bytes += bytes; 1749 sq->stats.packets += packets; 1750 u64_stats_update_end(&sq->stats.syncp); 1751 } 1752 1753 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) 1754 { 1755 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) 1756 return false; 1757 else if (q < vi->curr_queue_pairs) 1758 return true; 1759 else 1760 return false; 1761 } 1762 1763 static void virtnet_poll_cleantx(struct receive_queue *rq) 1764 { 1765 struct virtnet_info *vi = rq->vq->vdev->priv; 1766 unsigned int index = vq2rxq(rq->vq); 1767 struct send_queue *sq = &vi->sq[index]; 1768 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1769 1770 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) 1771 return; 1772 1773 if (__netif_tx_trylock(txq)) { 1774 if (sq->reset) { 1775 __netif_tx_unlock(txq); 1776 return; 1777 } 1778 1779 do { 1780 virtqueue_disable_cb(sq->vq); 1781 free_old_xmit_skbs(sq, true); 1782 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 1783 1784 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1785 netif_tx_wake_queue(txq); 1786 1787 __netif_tx_unlock(txq); 1788 } 1789 } 1790 1791 static int virtnet_poll(struct napi_struct *napi, int budget) 1792 { 1793 struct receive_queue *rq = 1794 container_of(napi, struct receive_queue, napi); 1795 struct virtnet_info *vi = rq->vq->vdev->priv; 1796 struct send_queue *sq; 1797 unsigned int received; 1798 unsigned int xdp_xmit = 0; 1799 1800 virtnet_poll_cleantx(rq); 1801 1802 received = virtnet_receive(rq, budget, &xdp_xmit); 1803 1804 if (xdp_xmit & VIRTIO_XDP_REDIR) 1805 xdp_do_flush(); 1806 1807 /* Out of packets? */ 1808 if (received < budget) 1809 virtqueue_napi_complete(napi, rq->vq, received); 1810 1811 if (xdp_xmit & VIRTIO_XDP_TX) { 1812 sq = virtnet_xdp_get_sq(vi); 1813 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1814 u64_stats_update_begin(&sq->stats.syncp); 1815 sq->stats.kicks++; 1816 u64_stats_update_end(&sq->stats.syncp); 1817 } 1818 virtnet_xdp_put_sq(vi, sq); 1819 } 1820 1821 return received; 1822 } 1823 1824 static int virtnet_open(struct net_device *dev) 1825 { 1826 struct virtnet_info *vi = netdev_priv(dev); 1827 int i, err; 1828 1829 enable_delayed_refill(vi); 1830 1831 for (i = 0; i < vi->max_queue_pairs; i++) { 1832 if (i < vi->curr_queue_pairs) 1833 /* Make sure we have some buffers: if oom use wq. */ 1834 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1835 schedule_delayed_work(&vi->refill, 0); 1836 1837 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id); 1838 if (err < 0) 1839 return err; 1840 1841 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, 1842 MEM_TYPE_PAGE_SHARED, NULL); 1843 if (err < 0) { 1844 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1845 return err; 1846 } 1847 1848 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 1849 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); 1850 } 1851 1852 return 0; 1853 } 1854 1855 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1856 { 1857 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1858 struct virtnet_info *vi = sq->vq->vdev->priv; 1859 unsigned int index = vq2txq(sq->vq); 1860 struct netdev_queue *txq; 1861 int opaque; 1862 bool done; 1863 1864 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { 1865 /* We don't need to enable cb for XDP */ 1866 napi_complete_done(napi, 0); 1867 return 0; 1868 } 1869 1870 txq = netdev_get_tx_queue(vi->dev, index); 1871 __netif_tx_lock(txq, raw_smp_processor_id()); 1872 virtqueue_disable_cb(sq->vq); 1873 free_old_xmit_skbs(sq, true); 1874 1875 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1876 netif_tx_wake_queue(txq); 1877 1878 opaque = virtqueue_enable_cb_prepare(sq->vq); 1879 1880 done = napi_complete_done(napi, 0); 1881 1882 if (!done) 1883 virtqueue_disable_cb(sq->vq); 1884 1885 __netif_tx_unlock(txq); 1886 1887 if (done) { 1888 if (unlikely(virtqueue_poll(sq->vq, opaque))) { 1889 if (napi_schedule_prep(napi)) { 1890 __netif_tx_lock(txq, raw_smp_processor_id()); 1891 virtqueue_disable_cb(sq->vq); 1892 __netif_tx_unlock(txq); 1893 __napi_schedule(napi); 1894 } 1895 } 1896 } 1897 1898 return 0; 1899 } 1900 1901 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1902 { 1903 struct virtio_net_hdr_mrg_rxbuf *hdr; 1904 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1905 struct virtnet_info *vi = sq->vq->vdev->priv; 1906 int num_sg; 1907 unsigned hdr_len = vi->hdr_len; 1908 bool can_push; 1909 1910 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1911 1912 can_push = vi->any_header_sg && 1913 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1914 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1915 /* Even if we can, don't push here yet as this would skew 1916 * csum_start offset below. */ 1917 if (can_push) 1918 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 1919 else 1920 hdr = skb_vnet_hdr(skb); 1921 1922 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 1923 virtio_is_little_endian(vi->vdev), false, 1924 0)) 1925 return -EPROTO; 1926 1927 if (vi->mergeable_rx_bufs) 1928 hdr->num_buffers = 0; 1929 1930 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 1931 if (can_push) { 1932 __skb_push(skb, hdr_len); 1933 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 1934 if (unlikely(num_sg < 0)) 1935 return num_sg; 1936 /* Pull header back to avoid skew in tx bytes calculations. */ 1937 __skb_pull(skb, hdr_len); 1938 } else { 1939 sg_set_buf(sq->sg, hdr, hdr_len); 1940 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 1941 if (unlikely(num_sg < 0)) 1942 return num_sg; 1943 num_sg++; 1944 } 1945 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 1946 } 1947 1948 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 1949 { 1950 struct virtnet_info *vi = netdev_priv(dev); 1951 int qnum = skb_get_queue_mapping(skb); 1952 struct send_queue *sq = &vi->sq[qnum]; 1953 int err; 1954 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 1955 bool kick = !netdev_xmit_more(); 1956 bool use_napi = sq->napi.weight; 1957 1958 /* Free up any pending old buffers before queueing new ones. */ 1959 do { 1960 if (use_napi) 1961 virtqueue_disable_cb(sq->vq); 1962 1963 free_old_xmit_skbs(sq, false); 1964 1965 } while (use_napi && kick && 1966 unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 1967 1968 /* timestamp packet in software */ 1969 skb_tx_timestamp(skb); 1970 1971 /* Try to transmit */ 1972 err = xmit_skb(sq, skb); 1973 1974 /* This should not happen! */ 1975 if (unlikely(err)) { 1976 dev->stats.tx_fifo_errors++; 1977 if (net_ratelimit()) 1978 dev_warn(&dev->dev, 1979 "Unexpected TXQ (%d) queue failure: %d\n", 1980 qnum, err); 1981 dev->stats.tx_dropped++; 1982 dev_kfree_skb_any(skb); 1983 return NETDEV_TX_OK; 1984 } 1985 1986 /* Don't wait up for transmitted skbs to be freed. */ 1987 if (!use_napi) { 1988 skb_orphan(skb); 1989 nf_reset_ct(skb); 1990 } 1991 1992 /* If running out of space, stop queue to avoid getting packets that we 1993 * are then unable to transmit. 1994 * An alternative would be to force queuing layer to requeue the skb by 1995 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 1996 * returned in a normal path of operation: it means that driver is not 1997 * maintaining the TX queue stop/start state properly, and causes 1998 * the stack to do a non-trivial amount of useless work. 1999 * Since most packets only take 1 or 2 ring slots, stopping the queue 2000 * early means 16 slots are typically wasted. 2001 */ 2002 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 2003 netif_stop_subqueue(dev, qnum); 2004 if (use_napi) { 2005 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) 2006 virtqueue_napi_schedule(&sq->napi, sq->vq); 2007 } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 2008 /* More just got used, free them then recheck. */ 2009 free_old_xmit_skbs(sq, false); 2010 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 2011 netif_start_subqueue(dev, qnum); 2012 virtqueue_disable_cb(sq->vq); 2013 } 2014 } 2015 } 2016 2017 if (kick || netif_xmit_stopped(txq)) { 2018 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 2019 u64_stats_update_begin(&sq->stats.syncp); 2020 sq->stats.kicks++; 2021 u64_stats_update_end(&sq->stats.syncp); 2022 } 2023 } 2024 2025 return NETDEV_TX_OK; 2026 } 2027 2028 static int virtnet_rx_resize(struct virtnet_info *vi, 2029 struct receive_queue *rq, u32 ring_num) 2030 { 2031 bool running = netif_running(vi->dev); 2032 int err, qindex; 2033 2034 qindex = rq - vi->rq; 2035 2036 if (running) 2037 napi_disable(&rq->napi); 2038 2039 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); 2040 if (err) 2041 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); 2042 2043 if (!try_fill_recv(vi, rq, GFP_KERNEL)) 2044 schedule_delayed_work(&vi->refill, 0); 2045 2046 if (running) 2047 virtnet_napi_enable(rq->vq, &rq->napi); 2048 return err; 2049 } 2050 2051 static int virtnet_tx_resize(struct virtnet_info *vi, 2052 struct send_queue *sq, u32 ring_num) 2053 { 2054 bool running = netif_running(vi->dev); 2055 struct netdev_queue *txq; 2056 int err, qindex; 2057 2058 qindex = sq - vi->sq; 2059 2060 if (running) 2061 virtnet_napi_tx_disable(&sq->napi); 2062 2063 txq = netdev_get_tx_queue(vi->dev, qindex); 2064 2065 /* 1. wait all ximt complete 2066 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue() 2067 */ 2068 __netif_tx_lock_bh(txq); 2069 2070 /* Prevent rx poll from accessing sq. */ 2071 sq->reset = true; 2072 2073 /* Prevent the upper layer from trying to send packets. */ 2074 netif_stop_subqueue(vi->dev, qindex); 2075 2076 __netif_tx_unlock_bh(txq); 2077 2078 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf); 2079 if (err) 2080 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err); 2081 2082 __netif_tx_lock_bh(txq); 2083 sq->reset = false; 2084 netif_tx_wake_queue(txq); 2085 __netif_tx_unlock_bh(txq); 2086 2087 if (running) 2088 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi); 2089 return err; 2090 } 2091 2092 /* 2093 * Send command via the control virtqueue and check status. Commands 2094 * supported by the hypervisor, as indicated by feature bits, should 2095 * never fail unless improperly formatted. 2096 */ 2097 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 2098 struct scatterlist *out) 2099 { 2100 struct scatterlist *sgs[4], hdr, stat; 2101 unsigned out_num = 0, tmp; 2102 int ret; 2103 2104 /* Caller should know better */ 2105 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 2106 2107 vi->ctrl->status = ~0; 2108 vi->ctrl->hdr.class = class; 2109 vi->ctrl->hdr.cmd = cmd; 2110 /* Add header */ 2111 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 2112 sgs[out_num++] = &hdr; 2113 2114 if (out) 2115 sgs[out_num++] = out; 2116 2117 /* Add return status. */ 2118 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 2119 sgs[out_num] = &stat; 2120 2121 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 2122 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 2123 if (ret < 0) { 2124 dev_warn(&vi->vdev->dev, 2125 "Failed to add sgs for command vq: %d\n.", ret); 2126 return false; 2127 } 2128 2129 if (unlikely(!virtqueue_kick(vi->cvq))) 2130 return vi->ctrl->status == VIRTIO_NET_OK; 2131 2132 /* Spin for a response, the kick causes an ioport write, trapping 2133 * into the hypervisor, so the request should be handled immediately. 2134 */ 2135 while (!virtqueue_get_buf(vi->cvq, &tmp) && 2136 !virtqueue_is_broken(vi->cvq)) 2137 cpu_relax(); 2138 2139 return vi->ctrl->status == VIRTIO_NET_OK; 2140 } 2141 2142 static int virtnet_set_mac_address(struct net_device *dev, void *p) 2143 { 2144 struct virtnet_info *vi = netdev_priv(dev); 2145 struct virtio_device *vdev = vi->vdev; 2146 int ret; 2147 struct sockaddr *addr; 2148 struct scatterlist sg; 2149 2150 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2151 return -EOPNOTSUPP; 2152 2153 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 2154 if (!addr) 2155 return -ENOMEM; 2156 2157 ret = eth_prepare_mac_addr_change(dev, addr); 2158 if (ret) 2159 goto out; 2160 2161 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 2162 sg_init_one(&sg, addr->sa_data, dev->addr_len); 2163 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2164 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 2165 dev_warn(&vdev->dev, 2166 "Failed to set mac address by vq command.\n"); 2167 ret = -EINVAL; 2168 goto out; 2169 } 2170 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 2171 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 2172 unsigned int i; 2173 2174 /* Naturally, this has an atomicity problem. */ 2175 for (i = 0; i < dev->addr_len; i++) 2176 virtio_cwrite8(vdev, 2177 offsetof(struct virtio_net_config, mac) + 2178 i, addr->sa_data[i]); 2179 } 2180 2181 eth_commit_mac_addr_change(dev, p); 2182 ret = 0; 2183 2184 out: 2185 kfree(addr); 2186 return ret; 2187 } 2188 2189 static void virtnet_stats(struct net_device *dev, 2190 struct rtnl_link_stats64 *tot) 2191 { 2192 struct virtnet_info *vi = netdev_priv(dev); 2193 unsigned int start; 2194 int i; 2195 2196 for (i = 0; i < vi->max_queue_pairs; i++) { 2197 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops; 2198 struct receive_queue *rq = &vi->rq[i]; 2199 struct send_queue *sq = &vi->sq[i]; 2200 2201 do { 2202 start = u64_stats_fetch_begin(&sq->stats.syncp); 2203 tpackets = sq->stats.packets; 2204 tbytes = sq->stats.bytes; 2205 terrors = sq->stats.tx_timeouts; 2206 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2207 2208 do { 2209 start = u64_stats_fetch_begin(&rq->stats.syncp); 2210 rpackets = rq->stats.packets; 2211 rbytes = rq->stats.bytes; 2212 rdrops = rq->stats.drops; 2213 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2214 2215 tot->rx_packets += rpackets; 2216 tot->tx_packets += tpackets; 2217 tot->rx_bytes += rbytes; 2218 tot->tx_bytes += tbytes; 2219 tot->rx_dropped += rdrops; 2220 tot->tx_errors += terrors; 2221 } 2222 2223 tot->tx_dropped = dev->stats.tx_dropped; 2224 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 2225 tot->rx_length_errors = dev->stats.rx_length_errors; 2226 tot->rx_frame_errors = dev->stats.rx_frame_errors; 2227 } 2228 2229 static void virtnet_ack_link_announce(struct virtnet_info *vi) 2230 { 2231 rtnl_lock(); 2232 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 2233 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 2234 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 2235 rtnl_unlock(); 2236 } 2237 2238 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2239 { 2240 struct scatterlist sg; 2241 struct net_device *dev = vi->dev; 2242 2243 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 2244 return 0; 2245 2246 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 2247 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 2248 2249 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2250 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 2251 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 2252 queue_pairs); 2253 return -EINVAL; 2254 } else { 2255 vi->curr_queue_pairs = queue_pairs; 2256 /* virtnet_open() will refill when device is going to up. */ 2257 if (dev->flags & IFF_UP) 2258 schedule_delayed_work(&vi->refill, 0); 2259 } 2260 2261 return 0; 2262 } 2263 2264 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2265 { 2266 int err; 2267 2268 rtnl_lock(); 2269 err = _virtnet_set_queues(vi, queue_pairs); 2270 rtnl_unlock(); 2271 return err; 2272 } 2273 2274 static int virtnet_close(struct net_device *dev) 2275 { 2276 struct virtnet_info *vi = netdev_priv(dev); 2277 int i; 2278 2279 /* Make sure NAPI doesn't schedule refill work */ 2280 disable_delayed_refill(vi); 2281 /* Make sure refill_work doesn't re-enable napi! */ 2282 cancel_delayed_work_sync(&vi->refill); 2283 2284 for (i = 0; i < vi->max_queue_pairs; i++) { 2285 virtnet_napi_tx_disable(&vi->sq[i].napi); 2286 napi_disable(&vi->rq[i].napi); 2287 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 2288 } 2289 2290 return 0; 2291 } 2292 2293 static void virtnet_set_rx_mode(struct net_device *dev) 2294 { 2295 struct virtnet_info *vi = netdev_priv(dev); 2296 struct scatterlist sg[2]; 2297 struct virtio_net_ctrl_mac *mac_data; 2298 struct netdev_hw_addr *ha; 2299 int uc_count; 2300 int mc_count; 2301 void *buf; 2302 int i; 2303 2304 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 2305 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 2306 return; 2307 2308 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 2309 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 2310 2311 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 2312 2313 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2314 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 2315 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 2316 vi->ctrl->promisc ? "en" : "dis"); 2317 2318 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 2319 2320 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2321 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 2322 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 2323 vi->ctrl->allmulti ? "en" : "dis"); 2324 2325 uc_count = netdev_uc_count(dev); 2326 mc_count = netdev_mc_count(dev); 2327 /* MAC filter - use one buffer for both lists */ 2328 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 2329 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 2330 mac_data = buf; 2331 if (!buf) 2332 return; 2333 2334 sg_init_table(sg, 2); 2335 2336 /* Store the unicast list and count in the front of the buffer */ 2337 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 2338 i = 0; 2339 netdev_for_each_uc_addr(ha, dev) 2340 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2341 2342 sg_set_buf(&sg[0], mac_data, 2343 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 2344 2345 /* multicast list and count fill the end */ 2346 mac_data = (void *)&mac_data->macs[uc_count][0]; 2347 2348 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 2349 i = 0; 2350 netdev_for_each_mc_addr(ha, dev) 2351 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2352 2353 sg_set_buf(&sg[1], mac_data, 2354 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 2355 2356 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2357 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 2358 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 2359 2360 kfree(buf); 2361 } 2362 2363 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 2364 __be16 proto, u16 vid) 2365 { 2366 struct virtnet_info *vi = netdev_priv(dev); 2367 struct scatterlist sg; 2368 2369 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2370 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2371 2372 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2373 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 2374 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 2375 return 0; 2376 } 2377 2378 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 2379 __be16 proto, u16 vid) 2380 { 2381 struct virtnet_info *vi = netdev_priv(dev); 2382 struct scatterlist sg; 2383 2384 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2385 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2386 2387 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2388 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 2389 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 2390 return 0; 2391 } 2392 2393 static void virtnet_clean_affinity(struct virtnet_info *vi) 2394 { 2395 int i; 2396 2397 if (vi->affinity_hint_set) { 2398 for (i = 0; i < vi->max_queue_pairs; i++) { 2399 virtqueue_set_affinity(vi->rq[i].vq, NULL); 2400 virtqueue_set_affinity(vi->sq[i].vq, NULL); 2401 } 2402 2403 vi->affinity_hint_set = false; 2404 } 2405 } 2406 2407 static void virtnet_set_affinity(struct virtnet_info *vi) 2408 { 2409 cpumask_var_t mask; 2410 int stragglers; 2411 int group_size; 2412 int i, j, cpu; 2413 int num_cpu; 2414 int stride; 2415 2416 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 2417 virtnet_clean_affinity(vi); 2418 return; 2419 } 2420 2421 num_cpu = num_online_cpus(); 2422 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 2423 stragglers = num_cpu >= vi->curr_queue_pairs ? 2424 num_cpu % vi->curr_queue_pairs : 2425 0; 2426 cpu = cpumask_first(cpu_online_mask); 2427 2428 for (i = 0; i < vi->curr_queue_pairs; i++) { 2429 group_size = stride + (i < stragglers ? 1 : 0); 2430 2431 for (j = 0; j < group_size; j++) { 2432 cpumask_set_cpu(cpu, mask); 2433 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 2434 nr_cpu_ids, false); 2435 } 2436 virtqueue_set_affinity(vi->rq[i].vq, mask); 2437 virtqueue_set_affinity(vi->sq[i].vq, mask); 2438 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS); 2439 cpumask_clear(mask); 2440 } 2441 2442 vi->affinity_hint_set = true; 2443 free_cpumask_var(mask); 2444 } 2445 2446 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 2447 { 2448 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2449 node); 2450 virtnet_set_affinity(vi); 2451 return 0; 2452 } 2453 2454 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 2455 { 2456 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2457 node_dead); 2458 virtnet_set_affinity(vi); 2459 return 0; 2460 } 2461 2462 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 2463 { 2464 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2465 node); 2466 2467 virtnet_clean_affinity(vi); 2468 return 0; 2469 } 2470 2471 static enum cpuhp_state virtionet_online; 2472 2473 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 2474 { 2475 int ret; 2476 2477 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 2478 if (ret) 2479 return ret; 2480 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2481 &vi->node_dead); 2482 if (!ret) 2483 return ret; 2484 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2485 return ret; 2486 } 2487 2488 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 2489 { 2490 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2491 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2492 &vi->node_dead); 2493 } 2494 2495 static void virtnet_get_ringparam(struct net_device *dev, 2496 struct ethtool_ringparam *ring, 2497 struct kernel_ethtool_ringparam *kernel_ring, 2498 struct netlink_ext_ack *extack) 2499 { 2500 struct virtnet_info *vi = netdev_priv(dev); 2501 2502 ring->rx_max_pending = vi->rq[0].vq->num_max; 2503 ring->tx_max_pending = vi->sq[0].vq->num_max; 2504 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2505 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2506 } 2507 2508 static int virtnet_set_ringparam(struct net_device *dev, 2509 struct ethtool_ringparam *ring, 2510 struct kernel_ethtool_ringparam *kernel_ring, 2511 struct netlink_ext_ack *extack) 2512 { 2513 struct virtnet_info *vi = netdev_priv(dev); 2514 u32 rx_pending, tx_pending; 2515 struct receive_queue *rq; 2516 struct send_queue *sq; 2517 int i, err; 2518 2519 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 2520 return -EINVAL; 2521 2522 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2523 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2524 2525 if (ring->rx_pending == rx_pending && 2526 ring->tx_pending == tx_pending) 2527 return 0; 2528 2529 if (ring->rx_pending > vi->rq[0].vq->num_max) 2530 return -EINVAL; 2531 2532 if (ring->tx_pending > vi->sq[0].vq->num_max) 2533 return -EINVAL; 2534 2535 for (i = 0; i < vi->max_queue_pairs; i++) { 2536 rq = vi->rq + i; 2537 sq = vi->sq + i; 2538 2539 if (ring->tx_pending != tx_pending) { 2540 err = virtnet_tx_resize(vi, sq, ring->tx_pending); 2541 if (err) 2542 return err; 2543 } 2544 2545 if (ring->rx_pending != rx_pending) { 2546 err = virtnet_rx_resize(vi, rq, ring->rx_pending); 2547 if (err) 2548 return err; 2549 } 2550 } 2551 2552 return 0; 2553 } 2554 2555 static bool virtnet_commit_rss_command(struct virtnet_info *vi) 2556 { 2557 struct net_device *dev = vi->dev; 2558 struct scatterlist sgs[4]; 2559 unsigned int sg_buf_size; 2560 2561 /* prepare sgs */ 2562 sg_init_table(sgs, 4); 2563 2564 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); 2565 sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); 2566 2567 sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1); 2568 sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); 2569 2570 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) 2571 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); 2572 sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); 2573 2574 sg_buf_size = vi->rss_key_size; 2575 sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size); 2576 2577 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2578 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG 2579 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) { 2580 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); 2581 return false; 2582 } 2583 return true; 2584 } 2585 2586 static void virtnet_init_default_rss(struct virtnet_info *vi) 2587 { 2588 u32 indir_val = 0; 2589 int i = 0; 2590 2591 vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; 2592 vi->rss_hash_types_saved = vi->rss_hash_types_supported; 2593 vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size 2594 ? vi->rss_indir_table_size - 1 : 0; 2595 vi->ctrl->rss.unclassified_queue = 0; 2596 2597 for (; i < vi->rss_indir_table_size; ++i) { 2598 indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); 2599 vi->ctrl->rss.indirection_table[i] = indir_val; 2600 } 2601 2602 vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; 2603 vi->ctrl->rss.hash_key_length = vi->rss_key_size; 2604 2605 netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); 2606 } 2607 2608 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info) 2609 { 2610 info->data = 0; 2611 switch (info->flow_type) { 2612 case TCP_V4_FLOW: 2613 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 2614 info->data = RXH_IP_SRC | RXH_IP_DST | 2615 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2616 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2617 info->data = RXH_IP_SRC | RXH_IP_DST; 2618 } 2619 break; 2620 case TCP_V6_FLOW: 2621 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 2622 info->data = RXH_IP_SRC | RXH_IP_DST | 2623 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2624 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2625 info->data = RXH_IP_SRC | RXH_IP_DST; 2626 } 2627 break; 2628 case UDP_V4_FLOW: 2629 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 2630 info->data = RXH_IP_SRC | RXH_IP_DST | 2631 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2632 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2633 info->data = RXH_IP_SRC | RXH_IP_DST; 2634 } 2635 break; 2636 case UDP_V6_FLOW: 2637 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 2638 info->data = RXH_IP_SRC | RXH_IP_DST | 2639 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2640 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2641 info->data = RXH_IP_SRC | RXH_IP_DST; 2642 } 2643 break; 2644 case IPV4_FLOW: 2645 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) 2646 info->data = RXH_IP_SRC | RXH_IP_DST; 2647 2648 break; 2649 case IPV6_FLOW: 2650 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) 2651 info->data = RXH_IP_SRC | RXH_IP_DST; 2652 2653 break; 2654 default: 2655 info->data = 0; 2656 break; 2657 } 2658 } 2659 2660 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info) 2661 { 2662 u32 new_hashtypes = vi->rss_hash_types_saved; 2663 bool is_disable = info->data & RXH_DISCARD; 2664 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3); 2665 2666 /* supports only 'sd', 'sdfn' and 'r' */ 2667 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable)) 2668 return false; 2669 2670 switch (info->flow_type) { 2671 case TCP_V4_FLOW: 2672 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4); 2673 if (!is_disable) 2674 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2675 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0); 2676 break; 2677 case UDP_V4_FLOW: 2678 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4); 2679 if (!is_disable) 2680 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2681 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0); 2682 break; 2683 case IPV4_FLOW: 2684 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2685 if (!is_disable) 2686 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2687 break; 2688 case TCP_V6_FLOW: 2689 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6); 2690 if (!is_disable) 2691 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2692 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0); 2693 break; 2694 case UDP_V6_FLOW: 2695 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6); 2696 if (!is_disable) 2697 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2698 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0); 2699 break; 2700 case IPV6_FLOW: 2701 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2702 if (!is_disable) 2703 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2704 break; 2705 default: 2706 /* unsupported flow */ 2707 return false; 2708 } 2709 2710 /* if unsupported hashtype was set */ 2711 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported)) 2712 return false; 2713 2714 if (new_hashtypes != vi->rss_hash_types_saved) { 2715 vi->rss_hash_types_saved = new_hashtypes; 2716 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 2717 if (vi->dev->features & NETIF_F_RXHASH) 2718 return virtnet_commit_rss_command(vi); 2719 } 2720 2721 return true; 2722 } 2723 2724 static void virtnet_get_drvinfo(struct net_device *dev, 2725 struct ethtool_drvinfo *info) 2726 { 2727 struct virtnet_info *vi = netdev_priv(dev); 2728 struct virtio_device *vdev = vi->vdev; 2729 2730 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 2731 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 2732 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 2733 2734 } 2735 2736 /* TODO: Eliminate OOO packets during switching */ 2737 static int virtnet_set_channels(struct net_device *dev, 2738 struct ethtool_channels *channels) 2739 { 2740 struct virtnet_info *vi = netdev_priv(dev); 2741 u16 queue_pairs = channels->combined_count; 2742 int err; 2743 2744 /* We don't support separate rx/tx channels. 2745 * We don't allow setting 'other' channels. 2746 */ 2747 if (channels->rx_count || channels->tx_count || channels->other_count) 2748 return -EINVAL; 2749 2750 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2751 return -EINVAL; 2752 2753 /* For now we don't support modifying channels while XDP is loaded 2754 * also when XDP is loaded all RX queues have XDP programs so we only 2755 * need to check a single RX queue. 2756 */ 2757 if (vi->rq[0].xdp_prog) 2758 return -EINVAL; 2759 2760 cpus_read_lock(); 2761 err = _virtnet_set_queues(vi, queue_pairs); 2762 if (err) { 2763 cpus_read_unlock(); 2764 goto err; 2765 } 2766 virtnet_set_affinity(vi); 2767 cpus_read_unlock(); 2768 2769 netif_set_real_num_tx_queues(dev, queue_pairs); 2770 netif_set_real_num_rx_queues(dev, queue_pairs); 2771 err: 2772 return err; 2773 } 2774 2775 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2776 { 2777 struct virtnet_info *vi = netdev_priv(dev); 2778 unsigned int i, j; 2779 u8 *p = data; 2780 2781 switch (stringset) { 2782 case ETH_SS_STATS: 2783 for (i = 0; i < vi->curr_queue_pairs; i++) { 2784 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) 2785 ethtool_sprintf(&p, "rx_queue_%u_%s", i, 2786 virtnet_rq_stats_desc[j].desc); 2787 } 2788 2789 for (i = 0; i < vi->curr_queue_pairs; i++) { 2790 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) 2791 ethtool_sprintf(&p, "tx_queue_%u_%s", i, 2792 virtnet_sq_stats_desc[j].desc); 2793 } 2794 break; 2795 } 2796 } 2797 2798 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2799 { 2800 struct virtnet_info *vi = netdev_priv(dev); 2801 2802 switch (sset) { 2803 case ETH_SS_STATS: 2804 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2805 VIRTNET_SQ_STATS_LEN); 2806 default: 2807 return -EOPNOTSUPP; 2808 } 2809 } 2810 2811 static void virtnet_get_ethtool_stats(struct net_device *dev, 2812 struct ethtool_stats *stats, u64 *data) 2813 { 2814 struct virtnet_info *vi = netdev_priv(dev); 2815 unsigned int idx = 0, start, i, j; 2816 const u8 *stats_base; 2817 size_t offset; 2818 2819 for (i = 0; i < vi->curr_queue_pairs; i++) { 2820 struct receive_queue *rq = &vi->rq[i]; 2821 2822 stats_base = (u8 *)&rq->stats; 2823 do { 2824 start = u64_stats_fetch_begin(&rq->stats.syncp); 2825 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2826 offset = virtnet_rq_stats_desc[j].offset; 2827 data[idx + j] = *(u64 *)(stats_base + offset); 2828 } 2829 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2830 idx += VIRTNET_RQ_STATS_LEN; 2831 } 2832 2833 for (i = 0; i < vi->curr_queue_pairs; i++) { 2834 struct send_queue *sq = &vi->sq[i]; 2835 2836 stats_base = (u8 *)&sq->stats; 2837 do { 2838 start = u64_stats_fetch_begin(&sq->stats.syncp); 2839 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2840 offset = virtnet_sq_stats_desc[j].offset; 2841 data[idx + j] = *(u64 *)(stats_base + offset); 2842 } 2843 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2844 idx += VIRTNET_SQ_STATS_LEN; 2845 } 2846 } 2847 2848 static void virtnet_get_channels(struct net_device *dev, 2849 struct ethtool_channels *channels) 2850 { 2851 struct virtnet_info *vi = netdev_priv(dev); 2852 2853 channels->combined_count = vi->curr_queue_pairs; 2854 channels->max_combined = vi->max_queue_pairs; 2855 channels->max_other = 0; 2856 channels->rx_count = 0; 2857 channels->tx_count = 0; 2858 channels->other_count = 0; 2859 } 2860 2861 static int virtnet_set_link_ksettings(struct net_device *dev, 2862 const struct ethtool_link_ksettings *cmd) 2863 { 2864 struct virtnet_info *vi = netdev_priv(dev); 2865 2866 return ethtool_virtdev_set_link_ksettings(dev, cmd, 2867 &vi->speed, &vi->duplex); 2868 } 2869 2870 static int virtnet_get_link_ksettings(struct net_device *dev, 2871 struct ethtool_link_ksettings *cmd) 2872 { 2873 struct virtnet_info *vi = netdev_priv(dev); 2874 2875 cmd->base.speed = vi->speed; 2876 cmd->base.duplex = vi->duplex; 2877 cmd->base.port = PORT_OTHER; 2878 2879 return 0; 2880 } 2881 2882 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi, 2883 struct ethtool_coalesce *ec) 2884 { 2885 struct scatterlist sgs_tx, sgs_rx; 2886 struct virtio_net_ctrl_coal_tx coal_tx; 2887 struct virtio_net_ctrl_coal_rx coal_rx; 2888 2889 coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs); 2890 coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames); 2891 sg_init_one(&sgs_tx, &coal_tx, sizeof(coal_tx)); 2892 2893 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2894 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET, 2895 &sgs_tx)) 2896 return -EINVAL; 2897 2898 /* Save parameters */ 2899 vi->tx_usecs = ec->tx_coalesce_usecs; 2900 vi->tx_max_packets = ec->tx_max_coalesced_frames; 2901 2902 coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); 2903 coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); 2904 sg_init_one(&sgs_rx, &coal_rx, sizeof(coal_rx)); 2905 2906 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2907 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, 2908 &sgs_rx)) 2909 return -EINVAL; 2910 2911 /* Save parameters */ 2912 vi->rx_usecs = ec->rx_coalesce_usecs; 2913 vi->rx_max_packets = ec->rx_max_coalesced_frames; 2914 2915 return 0; 2916 } 2917 2918 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec) 2919 { 2920 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL 2921 * feature is negotiated. 2922 */ 2923 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs) 2924 return -EOPNOTSUPP; 2925 2926 if (ec->tx_max_coalesced_frames > 1 || 2927 ec->rx_max_coalesced_frames != 1) 2928 return -EINVAL; 2929 2930 return 0; 2931 } 2932 2933 static int virtnet_set_coalesce(struct net_device *dev, 2934 struct ethtool_coalesce *ec, 2935 struct kernel_ethtool_coalesce *kernel_coal, 2936 struct netlink_ext_ack *extack) 2937 { 2938 struct virtnet_info *vi = netdev_priv(dev); 2939 int ret, i, napi_weight; 2940 bool update_napi = false; 2941 2942 /* Can't change NAPI weight if the link is up */ 2943 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 2944 if (napi_weight ^ vi->sq[0].napi.weight) { 2945 if (dev->flags & IFF_UP) 2946 return -EBUSY; 2947 else 2948 update_napi = true; 2949 } 2950 2951 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) 2952 ret = virtnet_send_notf_coal_cmds(vi, ec); 2953 else 2954 ret = virtnet_coal_params_supported(ec); 2955 2956 if (ret) 2957 return ret; 2958 2959 if (update_napi) { 2960 for (i = 0; i < vi->max_queue_pairs; i++) 2961 vi->sq[i].napi.weight = napi_weight; 2962 } 2963 2964 return ret; 2965 } 2966 2967 static int virtnet_get_coalesce(struct net_device *dev, 2968 struct ethtool_coalesce *ec, 2969 struct kernel_ethtool_coalesce *kernel_coal, 2970 struct netlink_ext_ack *extack) 2971 { 2972 struct virtnet_info *vi = netdev_priv(dev); 2973 2974 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 2975 ec->rx_coalesce_usecs = vi->rx_usecs; 2976 ec->tx_coalesce_usecs = vi->tx_usecs; 2977 ec->tx_max_coalesced_frames = vi->tx_max_packets; 2978 ec->rx_max_coalesced_frames = vi->rx_max_packets; 2979 } else { 2980 ec->rx_max_coalesced_frames = 1; 2981 2982 if (vi->sq[0].napi.weight) 2983 ec->tx_max_coalesced_frames = 1; 2984 } 2985 2986 return 0; 2987 } 2988 2989 static void virtnet_init_settings(struct net_device *dev) 2990 { 2991 struct virtnet_info *vi = netdev_priv(dev); 2992 2993 vi->speed = SPEED_UNKNOWN; 2994 vi->duplex = DUPLEX_UNKNOWN; 2995 } 2996 2997 static void virtnet_update_settings(struct virtnet_info *vi) 2998 { 2999 u32 speed; 3000 u8 duplex; 3001 3002 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 3003 return; 3004 3005 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); 3006 3007 if (ethtool_validate_speed(speed)) 3008 vi->speed = speed; 3009 3010 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); 3011 3012 if (ethtool_validate_duplex(duplex)) 3013 vi->duplex = duplex; 3014 } 3015 3016 static u32 virtnet_get_rxfh_key_size(struct net_device *dev) 3017 { 3018 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; 3019 } 3020 3021 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) 3022 { 3023 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; 3024 } 3025 3026 static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) 3027 { 3028 struct virtnet_info *vi = netdev_priv(dev); 3029 int i; 3030 3031 if (indir) { 3032 for (i = 0; i < vi->rss_indir_table_size; ++i) 3033 indir[i] = vi->ctrl->rss.indirection_table[i]; 3034 } 3035 3036 if (key) 3037 memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); 3038 3039 if (hfunc) 3040 *hfunc = ETH_RSS_HASH_TOP; 3041 3042 return 0; 3043 } 3044 3045 static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) 3046 { 3047 struct virtnet_info *vi = netdev_priv(dev); 3048 int i; 3049 3050 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) 3051 return -EOPNOTSUPP; 3052 3053 if (indir) { 3054 for (i = 0; i < vi->rss_indir_table_size; ++i) 3055 vi->ctrl->rss.indirection_table[i] = indir[i]; 3056 } 3057 if (key) 3058 memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); 3059 3060 virtnet_commit_rss_command(vi); 3061 3062 return 0; 3063 } 3064 3065 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) 3066 { 3067 struct virtnet_info *vi = netdev_priv(dev); 3068 int rc = 0; 3069 3070 switch (info->cmd) { 3071 case ETHTOOL_GRXRINGS: 3072 info->data = vi->curr_queue_pairs; 3073 break; 3074 case ETHTOOL_GRXFH: 3075 virtnet_get_hashflow(vi, info); 3076 break; 3077 default: 3078 rc = -EOPNOTSUPP; 3079 } 3080 3081 return rc; 3082 } 3083 3084 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) 3085 { 3086 struct virtnet_info *vi = netdev_priv(dev); 3087 int rc = 0; 3088 3089 switch (info->cmd) { 3090 case ETHTOOL_SRXFH: 3091 if (!virtnet_set_hashflow(vi, info)) 3092 rc = -EINVAL; 3093 3094 break; 3095 default: 3096 rc = -EOPNOTSUPP; 3097 } 3098 3099 return rc; 3100 } 3101 3102 static const struct ethtool_ops virtnet_ethtool_ops = { 3103 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | 3104 ETHTOOL_COALESCE_USECS, 3105 .get_drvinfo = virtnet_get_drvinfo, 3106 .get_link = ethtool_op_get_link, 3107 .get_ringparam = virtnet_get_ringparam, 3108 .set_ringparam = virtnet_set_ringparam, 3109 .get_strings = virtnet_get_strings, 3110 .get_sset_count = virtnet_get_sset_count, 3111 .get_ethtool_stats = virtnet_get_ethtool_stats, 3112 .set_channels = virtnet_set_channels, 3113 .get_channels = virtnet_get_channels, 3114 .get_ts_info = ethtool_op_get_ts_info, 3115 .get_link_ksettings = virtnet_get_link_ksettings, 3116 .set_link_ksettings = virtnet_set_link_ksettings, 3117 .set_coalesce = virtnet_set_coalesce, 3118 .get_coalesce = virtnet_get_coalesce, 3119 .get_rxfh_key_size = virtnet_get_rxfh_key_size, 3120 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, 3121 .get_rxfh = virtnet_get_rxfh, 3122 .set_rxfh = virtnet_set_rxfh, 3123 .get_rxnfc = virtnet_get_rxnfc, 3124 .set_rxnfc = virtnet_set_rxnfc, 3125 }; 3126 3127 static void virtnet_freeze_down(struct virtio_device *vdev) 3128 { 3129 struct virtnet_info *vi = vdev->priv; 3130 3131 /* Make sure no work handler is accessing the device */ 3132 flush_work(&vi->config_work); 3133 3134 netif_tx_lock_bh(vi->dev); 3135 netif_device_detach(vi->dev); 3136 netif_tx_unlock_bh(vi->dev); 3137 if (netif_running(vi->dev)) 3138 virtnet_close(vi->dev); 3139 } 3140 3141 static int init_vqs(struct virtnet_info *vi); 3142 3143 static int virtnet_restore_up(struct virtio_device *vdev) 3144 { 3145 struct virtnet_info *vi = vdev->priv; 3146 int err; 3147 3148 err = init_vqs(vi); 3149 if (err) 3150 return err; 3151 3152 virtio_device_ready(vdev); 3153 3154 enable_delayed_refill(vi); 3155 3156 if (netif_running(vi->dev)) { 3157 err = virtnet_open(vi->dev); 3158 if (err) 3159 return err; 3160 } 3161 3162 netif_tx_lock_bh(vi->dev); 3163 netif_device_attach(vi->dev); 3164 netif_tx_unlock_bh(vi->dev); 3165 return err; 3166 } 3167 3168 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 3169 { 3170 struct scatterlist sg; 3171 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 3172 3173 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 3174 3175 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 3176 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 3177 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); 3178 return -EINVAL; 3179 } 3180 3181 return 0; 3182 } 3183 3184 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 3185 { 3186 u64 offloads = 0; 3187 3188 if (!vi->guest_offloads) 3189 return 0; 3190 3191 return virtnet_set_guest_offloads(vi, offloads); 3192 } 3193 3194 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 3195 { 3196 u64 offloads = vi->guest_offloads; 3197 3198 if (!vi->guest_offloads) 3199 return 0; 3200 3201 return virtnet_set_guest_offloads(vi, offloads); 3202 } 3203 3204 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 3205 struct netlink_ext_ack *extack) 3206 { 3207 unsigned int room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 3208 sizeof(struct skb_shared_info)); 3209 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN; 3210 struct virtnet_info *vi = netdev_priv(dev); 3211 struct bpf_prog *old_prog; 3212 u16 xdp_qp = 0, curr_qp; 3213 int i, err; 3214 3215 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 3216 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3217 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3218 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3219 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3220 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) || 3221 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) || 3222 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) { 3223 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first"); 3224 return -EOPNOTSUPP; 3225 } 3226 3227 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 3228 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 3229 return -EINVAL; 3230 } 3231 3232 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) { 3233 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags"); 3234 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz); 3235 return -EINVAL; 3236 } 3237 3238 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 3239 if (prog) 3240 xdp_qp = nr_cpu_ids; 3241 3242 /* XDP requires extra queues for XDP_TX */ 3243 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 3244 netdev_warn_once(dev, "XDP request %i queues but max is %i. XDP_TX and XDP_REDIRECT will operate in a slower locked tx mode.\n", 3245 curr_qp + xdp_qp, vi->max_queue_pairs); 3246 xdp_qp = 0; 3247 } 3248 3249 old_prog = rtnl_dereference(vi->rq[0].xdp_prog); 3250 if (!prog && !old_prog) 3251 return 0; 3252 3253 if (prog) 3254 bpf_prog_add(prog, vi->max_queue_pairs - 1); 3255 3256 /* Make sure NAPI is not using any XDP TX queues for RX. */ 3257 if (netif_running(dev)) { 3258 for (i = 0; i < vi->max_queue_pairs; i++) { 3259 napi_disable(&vi->rq[i].napi); 3260 virtnet_napi_tx_disable(&vi->sq[i].napi); 3261 } 3262 } 3263 3264 if (!prog) { 3265 for (i = 0; i < vi->max_queue_pairs; i++) { 3266 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3267 if (i == 0) 3268 virtnet_restore_guest_offloads(vi); 3269 } 3270 synchronize_net(); 3271 } 3272 3273 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 3274 if (err) 3275 goto err; 3276 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 3277 vi->xdp_queue_pairs = xdp_qp; 3278 3279 if (prog) { 3280 vi->xdp_enabled = true; 3281 for (i = 0; i < vi->max_queue_pairs; i++) { 3282 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3283 if (i == 0 && !old_prog) 3284 virtnet_clear_guest_offloads(vi); 3285 } 3286 if (!old_prog) 3287 xdp_features_set_redirect_target(dev, true); 3288 } else { 3289 xdp_features_clear_redirect_target(dev); 3290 vi->xdp_enabled = false; 3291 } 3292 3293 for (i = 0; i < vi->max_queue_pairs; i++) { 3294 if (old_prog) 3295 bpf_prog_put(old_prog); 3296 if (netif_running(dev)) { 3297 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3298 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3299 &vi->sq[i].napi); 3300 } 3301 } 3302 3303 return 0; 3304 3305 err: 3306 if (!prog) { 3307 virtnet_clear_guest_offloads(vi); 3308 for (i = 0; i < vi->max_queue_pairs; i++) 3309 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); 3310 } 3311 3312 if (netif_running(dev)) { 3313 for (i = 0; i < vi->max_queue_pairs; i++) { 3314 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3315 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3316 &vi->sq[i].napi); 3317 } 3318 } 3319 if (prog) 3320 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 3321 return err; 3322 } 3323 3324 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 3325 { 3326 switch (xdp->command) { 3327 case XDP_SETUP_PROG: 3328 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 3329 default: 3330 return -EINVAL; 3331 } 3332 } 3333 3334 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 3335 size_t len) 3336 { 3337 struct virtnet_info *vi = netdev_priv(dev); 3338 int ret; 3339 3340 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 3341 return -EOPNOTSUPP; 3342 3343 ret = snprintf(buf, len, "sby"); 3344 if (ret >= len) 3345 return -EOPNOTSUPP; 3346 3347 return 0; 3348 } 3349 3350 static int virtnet_set_features(struct net_device *dev, 3351 netdev_features_t features) 3352 { 3353 struct virtnet_info *vi = netdev_priv(dev); 3354 u64 offloads; 3355 int err; 3356 3357 if ((dev->features ^ features) & NETIF_F_GRO_HW) { 3358 if (vi->xdp_enabled) 3359 return -EBUSY; 3360 3361 if (features & NETIF_F_GRO_HW) 3362 offloads = vi->guest_offloads_capable; 3363 else 3364 offloads = vi->guest_offloads_capable & 3365 ~GUEST_OFFLOAD_GRO_HW_MASK; 3366 3367 err = virtnet_set_guest_offloads(vi, offloads); 3368 if (err) 3369 return err; 3370 vi->guest_offloads = offloads; 3371 } 3372 3373 if ((dev->features ^ features) & NETIF_F_RXHASH) { 3374 if (features & NETIF_F_RXHASH) 3375 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 3376 else 3377 vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; 3378 3379 if (!virtnet_commit_rss_command(vi)) 3380 return -EINVAL; 3381 } 3382 3383 return 0; 3384 } 3385 3386 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue) 3387 { 3388 struct virtnet_info *priv = netdev_priv(dev); 3389 struct send_queue *sq = &priv->sq[txqueue]; 3390 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue); 3391 3392 u64_stats_update_begin(&sq->stats.syncp); 3393 sq->stats.tx_timeouts++; 3394 u64_stats_update_end(&sq->stats.syncp); 3395 3396 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n", 3397 txqueue, sq->name, sq->vq->index, sq->vq->name, 3398 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start))); 3399 } 3400 3401 static const struct net_device_ops virtnet_netdev = { 3402 .ndo_open = virtnet_open, 3403 .ndo_stop = virtnet_close, 3404 .ndo_start_xmit = start_xmit, 3405 .ndo_validate_addr = eth_validate_addr, 3406 .ndo_set_mac_address = virtnet_set_mac_address, 3407 .ndo_set_rx_mode = virtnet_set_rx_mode, 3408 .ndo_get_stats64 = virtnet_stats, 3409 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 3410 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 3411 .ndo_bpf = virtnet_xdp, 3412 .ndo_xdp_xmit = virtnet_xdp_xmit, 3413 .ndo_features_check = passthru_features_check, 3414 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 3415 .ndo_set_features = virtnet_set_features, 3416 .ndo_tx_timeout = virtnet_tx_timeout, 3417 }; 3418 3419 static void virtnet_config_changed_work(struct work_struct *work) 3420 { 3421 struct virtnet_info *vi = 3422 container_of(work, struct virtnet_info, config_work); 3423 u16 v; 3424 3425 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 3426 struct virtio_net_config, status, &v) < 0) 3427 return; 3428 3429 if (v & VIRTIO_NET_S_ANNOUNCE) { 3430 netdev_notify_peers(vi->dev); 3431 virtnet_ack_link_announce(vi); 3432 } 3433 3434 /* Ignore unknown (future) status bits */ 3435 v &= VIRTIO_NET_S_LINK_UP; 3436 3437 if (vi->status == v) 3438 return; 3439 3440 vi->status = v; 3441 3442 if (vi->status & VIRTIO_NET_S_LINK_UP) { 3443 virtnet_update_settings(vi); 3444 netif_carrier_on(vi->dev); 3445 netif_tx_wake_all_queues(vi->dev); 3446 } else { 3447 netif_carrier_off(vi->dev); 3448 netif_tx_stop_all_queues(vi->dev); 3449 } 3450 } 3451 3452 static void virtnet_config_changed(struct virtio_device *vdev) 3453 { 3454 struct virtnet_info *vi = vdev->priv; 3455 3456 schedule_work(&vi->config_work); 3457 } 3458 3459 static void virtnet_free_queues(struct virtnet_info *vi) 3460 { 3461 int i; 3462 3463 for (i = 0; i < vi->max_queue_pairs; i++) { 3464 __netif_napi_del(&vi->rq[i].napi); 3465 __netif_napi_del(&vi->sq[i].napi); 3466 } 3467 3468 /* We called __netif_napi_del(), 3469 * we need to respect an RCU grace period before freeing vi->rq 3470 */ 3471 synchronize_net(); 3472 3473 kfree(vi->rq); 3474 kfree(vi->sq); 3475 kfree(vi->ctrl); 3476 } 3477 3478 static void _free_receive_bufs(struct virtnet_info *vi) 3479 { 3480 struct bpf_prog *old_prog; 3481 int i; 3482 3483 for (i = 0; i < vi->max_queue_pairs; i++) { 3484 while (vi->rq[i].pages) 3485 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 3486 3487 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 3488 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 3489 if (old_prog) 3490 bpf_prog_put(old_prog); 3491 } 3492 } 3493 3494 static void free_receive_bufs(struct virtnet_info *vi) 3495 { 3496 rtnl_lock(); 3497 _free_receive_bufs(vi); 3498 rtnl_unlock(); 3499 } 3500 3501 static void free_receive_page_frags(struct virtnet_info *vi) 3502 { 3503 int i; 3504 for (i = 0; i < vi->max_queue_pairs; i++) 3505 if (vi->rq[i].alloc_frag.page) 3506 put_page(vi->rq[i].alloc_frag.page); 3507 } 3508 3509 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) 3510 { 3511 if (!is_xdp_frame(buf)) 3512 dev_kfree_skb(buf); 3513 else 3514 xdp_return_frame(ptr_to_xdp(buf)); 3515 } 3516 3517 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf) 3518 { 3519 struct virtnet_info *vi = vq->vdev->priv; 3520 int i = vq2rxq(vq); 3521 3522 if (vi->mergeable_rx_bufs) 3523 put_page(virt_to_head_page(buf)); 3524 else if (vi->big_packets) 3525 give_pages(&vi->rq[i], buf); 3526 else 3527 put_page(virt_to_head_page(buf)); 3528 } 3529 3530 static void free_unused_bufs(struct virtnet_info *vi) 3531 { 3532 void *buf; 3533 int i; 3534 3535 for (i = 0; i < vi->max_queue_pairs; i++) { 3536 struct virtqueue *vq = vi->sq[i].vq; 3537 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3538 virtnet_sq_free_unused_buf(vq, buf); 3539 } 3540 3541 for (i = 0; i < vi->max_queue_pairs; i++) { 3542 struct virtqueue *vq = vi->rq[i].vq; 3543 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3544 virtnet_rq_free_unused_buf(vq, buf); 3545 } 3546 } 3547 3548 static void virtnet_del_vqs(struct virtnet_info *vi) 3549 { 3550 struct virtio_device *vdev = vi->vdev; 3551 3552 virtnet_clean_affinity(vi); 3553 3554 vdev->config->del_vqs(vdev); 3555 3556 virtnet_free_queues(vi); 3557 } 3558 3559 /* How large should a single buffer be so a queue full of these can fit at 3560 * least one full packet? 3561 * Logic below assumes the mergeable buffer header is used. 3562 */ 3563 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 3564 { 3565 const unsigned int hdr_len = vi->hdr_len; 3566 unsigned int rq_size = virtqueue_get_vring_size(vq); 3567 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 3568 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 3569 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 3570 3571 return max(max(min_buf_len, hdr_len) - hdr_len, 3572 (unsigned int)GOOD_PACKET_LEN); 3573 } 3574 3575 static int virtnet_find_vqs(struct virtnet_info *vi) 3576 { 3577 vq_callback_t **callbacks; 3578 struct virtqueue **vqs; 3579 int ret = -ENOMEM; 3580 int i, total_vqs; 3581 const char **names; 3582 bool *ctx; 3583 3584 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 3585 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 3586 * possible control vq. 3587 */ 3588 total_vqs = vi->max_queue_pairs * 2 + 3589 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 3590 3591 /* Allocate space for find_vqs parameters */ 3592 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 3593 if (!vqs) 3594 goto err_vq; 3595 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 3596 if (!callbacks) 3597 goto err_callback; 3598 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 3599 if (!names) 3600 goto err_names; 3601 if (!vi->big_packets || vi->mergeable_rx_bufs) { 3602 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 3603 if (!ctx) 3604 goto err_ctx; 3605 } else { 3606 ctx = NULL; 3607 } 3608 3609 /* Parameters for control virtqueue, if any */ 3610 if (vi->has_cvq) { 3611 callbacks[total_vqs - 1] = NULL; 3612 names[total_vqs - 1] = "control"; 3613 } 3614 3615 /* Allocate/initialize parameters for send/receive virtqueues */ 3616 for (i = 0; i < vi->max_queue_pairs; i++) { 3617 callbacks[rxq2vq(i)] = skb_recv_done; 3618 callbacks[txq2vq(i)] = skb_xmit_done; 3619 sprintf(vi->rq[i].name, "input.%d", i); 3620 sprintf(vi->sq[i].name, "output.%d", i); 3621 names[rxq2vq(i)] = vi->rq[i].name; 3622 names[txq2vq(i)] = vi->sq[i].name; 3623 if (ctx) 3624 ctx[rxq2vq(i)] = true; 3625 } 3626 3627 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, 3628 names, ctx, NULL); 3629 if (ret) 3630 goto err_find; 3631 3632 if (vi->has_cvq) { 3633 vi->cvq = vqs[total_vqs - 1]; 3634 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 3635 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 3636 } 3637 3638 for (i = 0; i < vi->max_queue_pairs; i++) { 3639 vi->rq[i].vq = vqs[rxq2vq(i)]; 3640 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 3641 vi->sq[i].vq = vqs[txq2vq(i)]; 3642 } 3643 3644 /* run here: ret == 0. */ 3645 3646 3647 err_find: 3648 kfree(ctx); 3649 err_ctx: 3650 kfree(names); 3651 err_names: 3652 kfree(callbacks); 3653 err_callback: 3654 kfree(vqs); 3655 err_vq: 3656 return ret; 3657 } 3658 3659 static int virtnet_alloc_queues(struct virtnet_info *vi) 3660 { 3661 int i; 3662 3663 if (vi->has_cvq) { 3664 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 3665 if (!vi->ctrl) 3666 goto err_ctrl; 3667 } else { 3668 vi->ctrl = NULL; 3669 } 3670 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 3671 if (!vi->sq) 3672 goto err_sq; 3673 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 3674 if (!vi->rq) 3675 goto err_rq; 3676 3677 INIT_DELAYED_WORK(&vi->refill, refill_work); 3678 for (i = 0; i < vi->max_queue_pairs; i++) { 3679 vi->rq[i].pages = NULL; 3680 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll, 3681 napi_weight); 3682 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi, 3683 virtnet_poll_tx, 3684 napi_tx ? napi_weight : 0); 3685 3686 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 3687 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 3688 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 3689 3690 u64_stats_init(&vi->rq[i].stats.syncp); 3691 u64_stats_init(&vi->sq[i].stats.syncp); 3692 } 3693 3694 return 0; 3695 3696 err_rq: 3697 kfree(vi->sq); 3698 err_sq: 3699 kfree(vi->ctrl); 3700 err_ctrl: 3701 return -ENOMEM; 3702 } 3703 3704 static int init_vqs(struct virtnet_info *vi) 3705 { 3706 int ret; 3707 3708 /* Allocate send & receive queues */ 3709 ret = virtnet_alloc_queues(vi); 3710 if (ret) 3711 goto err; 3712 3713 ret = virtnet_find_vqs(vi); 3714 if (ret) 3715 goto err_free; 3716 3717 cpus_read_lock(); 3718 virtnet_set_affinity(vi); 3719 cpus_read_unlock(); 3720 3721 return 0; 3722 3723 err_free: 3724 virtnet_free_queues(vi); 3725 err: 3726 return ret; 3727 } 3728 3729 #ifdef CONFIG_SYSFS 3730 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 3731 char *buf) 3732 { 3733 struct virtnet_info *vi = netdev_priv(queue->dev); 3734 unsigned int queue_index = get_netdev_rx_queue_index(queue); 3735 unsigned int headroom = virtnet_get_headroom(vi); 3736 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 3737 struct ewma_pkt_len *avg; 3738 3739 BUG_ON(queue_index >= vi->max_queue_pairs); 3740 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 3741 return sprintf(buf, "%u\n", 3742 get_mergeable_buf_len(&vi->rq[queue_index], avg, 3743 SKB_DATA_ALIGN(headroom + tailroom))); 3744 } 3745 3746 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 3747 __ATTR_RO(mergeable_rx_buffer_size); 3748 3749 static struct attribute *virtio_net_mrg_rx_attrs[] = { 3750 &mergeable_rx_buffer_size_attribute.attr, 3751 NULL 3752 }; 3753 3754 static const struct attribute_group virtio_net_mrg_rx_group = { 3755 .name = "virtio_net", 3756 .attrs = virtio_net_mrg_rx_attrs 3757 }; 3758 #endif 3759 3760 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 3761 unsigned int fbit, 3762 const char *fname, const char *dname) 3763 { 3764 if (!virtio_has_feature(vdev, fbit)) 3765 return false; 3766 3767 dev_err(&vdev->dev, "device advertises feature %s but not %s", 3768 fname, dname); 3769 3770 return true; 3771 } 3772 3773 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 3774 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 3775 3776 static bool virtnet_validate_features(struct virtio_device *vdev) 3777 { 3778 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 3779 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 3780 "VIRTIO_NET_F_CTRL_VQ") || 3781 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 3782 "VIRTIO_NET_F_CTRL_VQ") || 3783 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 3784 "VIRTIO_NET_F_CTRL_VQ") || 3785 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 3786 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 3787 "VIRTIO_NET_F_CTRL_VQ") || 3788 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, 3789 "VIRTIO_NET_F_CTRL_VQ") || 3790 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT, 3791 "VIRTIO_NET_F_CTRL_VQ") || 3792 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL, 3793 "VIRTIO_NET_F_CTRL_VQ"))) { 3794 return false; 3795 } 3796 3797 return true; 3798 } 3799 3800 #define MIN_MTU ETH_MIN_MTU 3801 #define MAX_MTU ETH_MAX_MTU 3802 3803 static int virtnet_validate(struct virtio_device *vdev) 3804 { 3805 if (!vdev->config->get) { 3806 dev_err(&vdev->dev, "%s failure: config access disabled\n", 3807 __func__); 3808 return -EINVAL; 3809 } 3810 3811 if (!virtnet_validate_features(vdev)) 3812 return -EINVAL; 3813 3814 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3815 int mtu = virtio_cread16(vdev, 3816 offsetof(struct virtio_net_config, 3817 mtu)); 3818 if (mtu < MIN_MTU) 3819 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 3820 } 3821 3822 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) && 3823 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3824 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby"); 3825 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY); 3826 } 3827 3828 return 0; 3829 } 3830 3831 static bool virtnet_check_guest_gso(const struct virtnet_info *vi) 3832 { 3833 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3834 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3835 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3836 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3837 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) && 3838 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6)); 3839 } 3840 3841 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu) 3842 { 3843 bool guest_gso = virtnet_check_guest_gso(vi); 3844 3845 /* If device can receive ANY guest GSO packets, regardless of mtu, 3846 * allocate packets of maximum size, otherwise limit it to only 3847 * mtu size worth only. 3848 */ 3849 if (mtu > ETH_DATA_LEN || guest_gso) { 3850 vi->big_packets = true; 3851 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE); 3852 } 3853 } 3854 3855 static int virtnet_probe(struct virtio_device *vdev) 3856 { 3857 int i, err = -ENOMEM; 3858 struct net_device *dev; 3859 struct virtnet_info *vi; 3860 u16 max_queue_pairs; 3861 int mtu = 0; 3862 3863 /* Find if host supports multiqueue/rss virtio_net device */ 3864 max_queue_pairs = 1; 3865 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 3866 max_queue_pairs = 3867 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs)); 3868 3869 /* We need at least 2 queue's */ 3870 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 3871 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 3872 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 3873 max_queue_pairs = 1; 3874 3875 /* Allocate ourselves a network device with room for our info */ 3876 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 3877 if (!dev) 3878 return -ENOMEM; 3879 3880 /* Set up network device as normal. */ 3881 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE | 3882 IFF_TX_SKB_NO_LINEAR; 3883 dev->netdev_ops = &virtnet_netdev; 3884 dev->features = NETIF_F_HIGHDMA; 3885 3886 dev->ethtool_ops = &virtnet_ethtool_ops; 3887 SET_NETDEV_DEV(dev, &vdev->dev); 3888 3889 /* Do we support "hardware" checksums? */ 3890 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 3891 /* This opens up the world of extra features. */ 3892 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3893 if (csum) 3894 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3895 3896 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 3897 dev->hw_features |= NETIF_F_TSO 3898 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 3899 } 3900 /* Individual feature bits: what can host handle? */ 3901 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 3902 dev->hw_features |= NETIF_F_TSO; 3903 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 3904 dev->hw_features |= NETIF_F_TSO6; 3905 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 3906 dev->hw_features |= NETIF_F_TSO_ECN; 3907 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO)) 3908 dev->hw_features |= NETIF_F_GSO_UDP_L4; 3909 3910 dev->features |= NETIF_F_GSO_ROBUST; 3911 3912 if (gso) 3913 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 3914 /* (!csum && gso) case will be fixed by register_netdev() */ 3915 } 3916 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 3917 dev->features |= NETIF_F_RXCSUM; 3918 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3919 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 3920 dev->features |= NETIF_F_GRO_HW; 3921 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 3922 dev->hw_features |= NETIF_F_GRO_HW; 3923 3924 dev->vlan_features = dev->features; 3925 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT; 3926 3927 /* MTU range: 68 - 65535 */ 3928 dev->min_mtu = MIN_MTU; 3929 dev->max_mtu = MAX_MTU; 3930 3931 /* Configuration may specify what MAC to use. Otherwise random. */ 3932 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3933 u8 addr[ETH_ALEN]; 3934 3935 virtio_cread_bytes(vdev, 3936 offsetof(struct virtio_net_config, mac), 3937 addr, ETH_ALEN); 3938 eth_hw_addr_set(dev, addr); 3939 } else { 3940 eth_hw_addr_random(dev); 3941 dev_info(&vdev->dev, "Assigned random MAC address %pM\n", 3942 dev->dev_addr); 3943 } 3944 3945 /* Set up our device-specific information */ 3946 vi = netdev_priv(dev); 3947 vi->dev = dev; 3948 vi->vdev = vdev; 3949 vdev->priv = vi; 3950 3951 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 3952 spin_lock_init(&vi->refill_lock); 3953 3954 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { 3955 vi->mergeable_rx_bufs = true; 3956 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG; 3957 } 3958 3959 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 3960 vi->rx_usecs = 0; 3961 vi->tx_usecs = 0; 3962 vi->tx_max_packets = 0; 3963 vi->rx_max_packets = 0; 3964 } 3965 3966 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) 3967 vi->has_rss_hash_report = true; 3968 3969 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 3970 vi->has_rss = true; 3971 3972 if (vi->has_rss || vi->has_rss_hash_report) { 3973 vi->rss_indir_table_size = 3974 virtio_cread16(vdev, offsetof(struct virtio_net_config, 3975 rss_max_indirection_table_length)); 3976 vi->rss_key_size = 3977 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); 3978 3979 vi->rss_hash_types_supported = 3980 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); 3981 vi->rss_hash_types_supported &= 3982 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | 3983 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | 3984 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); 3985 3986 dev->hw_features |= NETIF_F_RXHASH; 3987 } 3988 3989 if (vi->has_rss_hash_report) 3990 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash); 3991 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 3992 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 3993 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 3994 else 3995 vi->hdr_len = sizeof(struct virtio_net_hdr); 3996 3997 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 3998 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 3999 vi->any_header_sg = true; 4000 4001 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 4002 vi->has_cvq = true; 4003 4004 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 4005 mtu = virtio_cread16(vdev, 4006 offsetof(struct virtio_net_config, 4007 mtu)); 4008 if (mtu < dev->min_mtu) { 4009 /* Should never trigger: MTU was previously validated 4010 * in virtnet_validate. 4011 */ 4012 dev_err(&vdev->dev, 4013 "device MTU appears to have changed it is now %d < %d", 4014 mtu, dev->min_mtu); 4015 err = -EINVAL; 4016 goto free; 4017 } 4018 4019 dev->mtu = mtu; 4020 dev->max_mtu = mtu; 4021 } 4022 4023 virtnet_set_big_packets(vi, mtu); 4024 4025 if (vi->any_header_sg) 4026 dev->needed_headroom = vi->hdr_len; 4027 4028 /* Enable multiqueue by default */ 4029 if (num_online_cpus() >= max_queue_pairs) 4030 vi->curr_queue_pairs = max_queue_pairs; 4031 else 4032 vi->curr_queue_pairs = num_online_cpus(); 4033 vi->max_queue_pairs = max_queue_pairs; 4034 4035 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 4036 err = init_vqs(vi); 4037 if (err) 4038 goto free; 4039 4040 #ifdef CONFIG_SYSFS 4041 if (vi->mergeable_rx_bufs) 4042 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 4043 #endif 4044 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 4045 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 4046 4047 virtnet_init_settings(dev); 4048 4049 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 4050 vi->failover = net_failover_create(vi->dev); 4051 if (IS_ERR(vi->failover)) { 4052 err = PTR_ERR(vi->failover); 4053 goto free_vqs; 4054 } 4055 } 4056 4057 if (vi->has_rss || vi->has_rss_hash_report) 4058 virtnet_init_default_rss(vi); 4059 4060 /* serialize netdev register + virtio_device_ready() with ndo_open() */ 4061 rtnl_lock(); 4062 4063 err = register_netdevice(dev); 4064 if (err) { 4065 pr_debug("virtio_net: registering device failed\n"); 4066 rtnl_unlock(); 4067 goto free_failover; 4068 } 4069 4070 virtio_device_ready(vdev); 4071 4072 /* a random MAC address has been assigned, notify the device. 4073 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there 4074 * because many devices work fine without getting MAC explicitly 4075 */ 4076 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 4077 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 4078 struct scatterlist sg; 4079 4080 sg_init_one(&sg, dev->dev_addr, dev->addr_len); 4081 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 4082 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 4083 pr_debug("virtio_net: setting MAC address failed\n"); 4084 rtnl_unlock(); 4085 err = -EINVAL; 4086 goto free_unregister_netdev; 4087 } 4088 } 4089 4090 rtnl_unlock(); 4091 4092 err = virtnet_cpu_notif_add(vi); 4093 if (err) { 4094 pr_debug("virtio_net: registering cpu notifier failed\n"); 4095 goto free_unregister_netdev; 4096 } 4097 4098 virtnet_set_queues(vi, vi->curr_queue_pairs); 4099 4100 /* Assume link up if device can't report link status, 4101 otherwise get link status from config. */ 4102 netif_carrier_off(dev); 4103 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 4104 schedule_work(&vi->config_work); 4105 } else { 4106 vi->status = VIRTIO_NET_S_LINK_UP; 4107 virtnet_update_settings(vi); 4108 netif_carrier_on(dev); 4109 } 4110 4111 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 4112 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 4113 set_bit(guest_offloads[i], &vi->guest_offloads); 4114 vi->guest_offloads_capable = vi->guest_offloads; 4115 4116 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 4117 dev->name, max_queue_pairs); 4118 4119 return 0; 4120 4121 free_unregister_netdev: 4122 unregister_netdev(dev); 4123 free_failover: 4124 net_failover_destroy(vi->failover); 4125 free_vqs: 4126 virtio_reset_device(vdev); 4127 cancel_delayed_work_sync(&vi->refill); 4128 free_receive_page_frags(vi); 4129 virtnet_del_vqs(vi); 4130 free: 4131 free_netdev(dev); 4132 return err; 4133 } 4134 4135 static void remove_vq_common(struct virtnet_info *vi) 4136 { 4137 virtio_reset_device(vi->vdev); 4138 4139 /* Free unused buffers in both send and recv, if any. */ 4140 free_unused_bufs(vi); 4141 4142 free_receive_bufs(vi); 4143 4144 free_receive_page_frags(vi); 4145 4146 virtnet_del_vqs(vi); 4147 } 4148 4149 static void virtnet_remove(struct virtio_device *vdev) 4150 { 4151 struct virtnet_info *vi = vdev->priv; 4152 4153 virtnet_cpu_notif_remove(vi); 4154 4155 /* Make sure no work handler is accessing the device. */ 4156 flush_work(&vi->config_work); 4157 4158 unregister_netdev(vi->dev); 4159 4160 net_failover_destroy(vi->failover); 4161 4162 remove_vq_common(vi); 4163 4164 free_netdev(vi->dev); 4165 } 4166 4167 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 4168 { 4169 struct virtnet_info *vi = vdev->priv; 4170 4171 virtnet_cpu_notif_remove(vi); 4172 virtnet_freeze_down(vdev); 4173 remove_vq_common(vi); 4174 4175 return 0; 4176 } 4177 4178 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 4179 { 4180 struct virtnet_info *vi = vdev->priv; 4181 int err; 4182 4183 err = virtnet_restore_up(vdev); 4184 if (err) 4185 return err; 4186 virtnet_set_queues(vi, vi->curr_queue_pairs); 4187 4188 err = virtnet_cpu_notif_add(vi); 4189 if (err) { 4190 virtnet_freeze_down(vdev); 4191 remove_vq_common(vi); 4192 return err; 4193 } 4194 4195 return 0; 4196 } 4197 4198 static struct virtio_device_id id_table[] = { 4199 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 4200 { 0 }, 4201 }; 4202 4203 #define VIRTNET_FEATURES \ 4204 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 4205 VIRTIO_NET_F_MAC, \ 4206 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 4207 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 4208 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 4209 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \ 4210 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 4211 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 4212 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 4213 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 4214 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 4215 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \ 4216 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL 4217 4218 static unsigned int features[] = { 4219 VIRTNET_FEATURES, 4220 }; 4221 4222 static unsigned int features_legacy[] = { 4223 VIRTNET_FEATURES, 4224 VIRTIO_NET_F_GSO, 4225 VIRTIO_F_ANY_LAYOUT, 4226 }; 4227 4228 static struct virtio_driver virtio_net_driver = { 4229 .feature_table = features, 4230 .feature_table_size = ARRAY_SIZE(features), 4231 .feature_table_legacy = features_legacy, 4232 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 4233 .driver.name = KBUILD_MODNAME, 4234 .driver.owner = THIS_MODULE, 4235 .id_table = id_table, 4236 .validate = virtnet_validate, 4237 .probe = virtnet_probe, 4238 .remove = virtnet_remove, 4239 .config_changed = virtnet_config_changed, 4240 #ifdef CONFIG_PM_SLEEP 4241 .freeze = virtnet_freeze, 4242 .restore = virtnet_restore, 4243 #endif 4244 }; 4245 4246 static __init int virtio_net_driver_init(void) 4247 { 4248 int ret; 4249 4250 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 4251 virtnet_cpu_online, 4252 virtnet_cpu_down_prep); 4253 if (ret < 0) 4254 goto out; 4255 virtionet_online = ret; 4256 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 4257 NULL, virtnet_cpu_dead); 4258 if (ret) 4259 goto err_dead; 4260 ret = register_virtio_driver(&virtio_net_driver); 4261 if (ret) 4262 goto err_virtio; 4263 return 0; 4264 err_virtio: 4265 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4266 err_dead: 4267 cpuhp_remove_multi_state(virtionet_online); 4268 out: 4269 return ret; 4270 } 4271 module_init(virtio_net_driver_init); 4272 4273 static __exit void virtio_net_driver_exit(void) 4274 { 4275 unregister_virtio_driver(&virtio_net_driver); 4276 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4277 cpuhp_remove_multi_state(virtionet_online); 4278 } 4279 module_exit(virtio_net_driver_exit); 4280 4281 MODULE_DEVICE_TABLE(virtio, id_table); 4282 MODULE_DESCRIPTION("Virtio network driver"); 4283 MODULE_LICENSE("GPL"); 4284