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