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 VIRTIO_NET_F_GUEST_HDRLEN 67 }; 68 69 #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ 70 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ 71 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ 72 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \ 73 (1ULL << VIRTIO_NET_F_GUEST_USO4) | \ 74 (1ULL << VIRTIO_NET_F_GUEST_USO6)) 75 76 struct virtnet_stat_desc { 77 char desc[ETH_GSTRING_LEN]; 78 size_t offset; 79 }; 80 81 struct virtnet_sq_stats { 82 struct u64_stats_sync syncp; 83 u64 packets; 84 u64 bytes; 85 u64 xdp_tx; 86 u64 xdp_tx_drops; 87 u64 kicks; 88 u64 tx_timeouts; 89 }; 90 91 struct virtnet_rq_stats { 92 struct u64_stats_sync syncp; 93 u64 packets; 94 u64 bytes; 95 u64 drops; 96 u64 xdp_packets; 97 u64 xdp_tx; 98 u64 xdp_redirects; 99 u64 xdp_drops; 100 u64 kicks; 101 }; 102 103 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) 104 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) 105 106 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { 107 { "packets", VIRTNET_SQ_STAT(packets) }, 108 { "bytes", VIRTNET_SQ_STAT(bytes) }, 109 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, 110 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, 111 { "kicks", VIRTNET_SQ_STAT(kicks) }, 112 { "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) }, 113 }; 114 115 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { 116 { "packets", VIRTNET_RQ_STAT(packets) }, 117 { "bytes", VIRTNET_RQ_STAT(bytes) }, 118 { "drops", VIRTNET_RQ_STAT(drops) }, 119 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, 120 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, 121 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, 122 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, 123 { "kicks", VIRTNET_RQ_STAT(kicks) }, 124 }; 125 126 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) 127 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) 128 129 /* Internal representation of a send virtqueue */ 130 struct send_queue { 131 /* Virtqueue associated with this send _queue */ 132 struct virtqueue *vq; 133 134 /* TX: fragments + linear part + virtio header */ 135 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 136 137 /* Name of the send queue: output.$index */ 138 char name[16]; 139 140 struct virtnet_sq_stats stats; 141 142 struct napi_struct napi; 143 144 /* Record whether sq is in reset state. */ 145 bool reset; 146 }; 147 148 /* Internal representation of a receive virtqueue */ 149 struct receive_queue { 150 /* Virtqueue associated with this receive_queue */ 151 struct virtqueue *vq; 152 153 struct napi_struct napi; 154 155 struct bpf_prog __rcu *xdp_prog; 156 157 struct virtnet_rq_stats stats; 158 159 /* Chain pages by the private ptr. */ 160 struct page *pages; 161 162 /* Average packet length for mergeable receive buffers. */ 163 struct ewma_pkt_len mrg_avg_pkt_len; 164 165 /* Page frag for packet buffer allocation. */ 166 struct page_frag alloc_frag; 167 168 /* RX: fragments + linear part + virtio header */ 169 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 170 171 /* Min single buffer size for mergeable buffers case. */ 172 unsigned int min_buf_len; 173 174 /* Name of this receive queue: input.$index */ 175 char name[16]; 176 177 struct xdp_rxq_info xdp_rxq; 178 }; 179 180 /* This structure can contain rss message with maximum settings for indirection table and keysize 181 * Note, that default structure that describes RSS configuration virtio_net_rss_config 182 * contains same info but can't handle table values. 183 * In any case, structure would be passed to virtio hw through sg_buf split by parts 184 * because table sizes may be differ according to the device configuration. 185 */ 186 #define VIRTIO_NET_RSS_MAX_KEY_SIZE 40 187 #define VIRTIO_NET_RSS_MAX_TABLE_LEN 128 188 struct virtio_net_ctrl_rss { 189 u32 hash_types; 190 u16 indirection_table_mask; 191 u16 unclassified_queue; 192 u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN]; 193 u16 max_tx_vq; 194 u8 hash_key_length; 195 u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE]; 196 }; 197 198 /* Control VQ buffers: protected by the rtnl lock */ 199 struct control_buf { 200 struct virtio_net_ctrl_hdr hdr; 201 virtio_net_ctrl_ack status; 202 struct virtio_net_ctrl_mq mq; 203 u8 promisc; 204 u8 allmulti; 205 __virtio16 vid; 206 __virtio64 offloads; 207 struct virtio_net_ctrl_rss rss; 208 }; 209 210 struct virtnet_info { 211 struct virtio_device *vdev; 212 struct virtqueue *cvq; 213 struct net_device *dev; 214 struct send_queue *sq; 215 struct receive_queue *rq; 216 unsigned int status; 217 218 /* Max # of queue pairs supported by the device */ 219 u16 max_queue_pairs; 220 221 /* # of queue pairs currently used by the driver */ 222 u16 curr_queue_pairs; 223 224 /* # of XDP queue pairs currently used by the driver */ 225 u16 xdp_queue_pairs; 226 227 /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */ 228 bool xdp_enabled; 229 230 /* I like... big packets and I cannot lie! */ 231 bool big_packets; 232 233 /* number of sg entries allocated for big packets */ 234 unsigned int big_packets_num_skbfrags; 235 236 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 237 bool mergeable_rx_bufs; 238 239 /* Host supports rss and/or hash report */ 240 bool has_rss; 241 bool has_rss_hash_report; 242 u8 rss_key_size; 243 u16 rss_indir_table_size; 244 u32 rss_hash_types_supported; 245 u32 rss_hash_types_saved; 246 247 /* Has control virtqueue */ 248 bool has_cvq; 249 250 /* Host can handle any s/g split between our header and packet data */ 251 bool any_header_sg; 252 253 /* Packet virtio header size */ 254 u8 hdr_len; 255 256 /* Work struct for delayed refilling if we run low on memory. */ 257 struct delayed_work refill; 258 259 /* Is delayed refill enabled? */ 260 bool refill_enabled; 261 262 /* The lock to synchronize the access to refill_enabled */ 263 spinlock_t refill_lock; 264 265 /* Work struct for config space updates */ 266 struct work_struct config_work; 267 268 /* Does the affinity hint is set for virtqueues? */ 269 bool affinity_hint_set; 270 271 /* CPU hotplug instances for online & dead */ 272 struct hlist_node node; 273 struct hlist_node node_dead; 274 275 struct control_buf *ctrl; 276 277 /* Ethtool settings */ 278 u8 duplex; 279 u32 speed; 280 281 /* Interrupt coalescing settings */ 282 u32 tx_usecs; 283 u32 rx_usecs; 284 u32 tx_max_packets; 285 u32 rx_max_packets; 286 287 unsigned long guest_offloads; 288 unsigned long guest_offloads_capable; 289 290 /* failover when STANDBY feature enabled */ 291 struct failover *failover; 292 }; 293 294 struct padded_vnet_hdr { 295 struct virtio_net_hdr_v1_hash hdr; 296 /* 297 * hdr is in a separate sg buffer, and data sg buffer shares same page 298 * with this header sg. This padding makes next sg 16 byte aligned 299 * after the header. 300 */ 301 char padding[12]; 302 }; 303 304 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); 305 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf); 306 307 static bool is_xdp_frame(void *ptr) 308 { 309 return (unsigned long)ptr & VIRTIO_XDP_FLAG; 310 } 311 312 static void *xdp_to_ptr(struct xdp_frame *ptr) 313 { 314 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); 315 } 316 317 static struct xdp_frame *ptr_to_xdp(void *ptr) 318 { 319 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); 320 } 321 322 /* Converting between virtqueue no. and kernel tx/rx queue no. 323 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 324 */ 325 static int vq2txq(struct virtqueue *vq) 326 { 327 return (vq->index - 1) / 2; 328 } 329 330 static int txq2vq(int txq) 331 { 332 return txq * 2 + 1; 333 } 334 335 static int vq2rxq(struct virtqueue *vq) 336 { 337 return vq->index / 2; 338 } 339 340 static int rxq2vq(int rxq) 341 { 342 return rxq * 2; 343 } 344 345 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 346 { 347 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 348 } 349 350 /* 351 * private is used to chain pages for big packets, put the whole 352 * most recent used list in the beginning for reuse 353 */ 354 static void give_pages(struct receive_queue *rq, struct page *page) 355 { 356 struct page *end; 357 358 /* Find end of list, sew whole thing into vi->rq.pages. */ 359 for (end = page; end->private; end = (struct page *)end->private); 360 end->private = (unsigned long)rq->pages; 361 rq->pages = page; 362 } 363 364 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 365 { 366 struct page *p = rq->pages; 367 368 if (p) { 369 rq->pages = (struct page *)p->private; 370 /* clear private here, it is used to chain pages */ 371 p->private = 0; 372 } else 373 p = alloc_page(gfp_mask); 374 return p; 375 } 376 377 static void enable_delayed_refill(struct virtnet_info *vi) 378 { 379 spin_lock_bh(&vi->refill_lock); 380 vi->refill_enabled = true; 381 spin_unlock_bh(&vi->refill_lock); 382 } 383 384 static void disable_delayed_refill(struct virtnet_info *vi) 385 { 386 spin_lock_bh(&vi->refill_lock); 387 vi->refill_enabled = false; 388 spin_unlock_bh(&vi->refill_lock); 389 } 390 391 static void virtqueue_napi_schedule(struct napi_struct *napi, 392 struct virtqueue *vq) 393 { 394 if (napi_schedule_prep(napi)) { 395 virtqueue_disable_cb(vq); 396 __napi_schedule(napi); 397 } 398 } 399 400 static void virtqueue_napi_complete(struct napi_struct *napi, 401 struct virtqueue *vq, int processed) 402 { 403 int opaque; 404 405 opaque = virtqueue_enable_cb_prepare(vq); 406 if (napi_complete_done(napi, processed)) { 407 if (unlikely(virtqueue_poll(vq, opaque))) 408 virtqueue_napi_schedule(napi, vq); 409 } else { 410 virtqueue_disable_cb(vq); 411 } 412 } 413 414 static void skb_xmit_done(struct virtqueue *vq) 415 { 416 struct virtnet_info *vi = vq->vdev->priv; 417 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; 418 419 /* Suppress further interrupts. */ 420 virtqueue_disable_cb(vq); 421 422 if (napi->weight) 423 virtqueue_napi_schedule(napi, vq); 424 else 425 /* We were probably waiting for more output buffers. */ 426 netif_wake_subqueue(vi->dev, vq2txq(vq)); 427 } 428 429 #define MRG_CTX_HEADER_SHIFT 22 430 static void *mergeable_len_to_ctx(unsigned int truesize, 431 unsigned int headroom) 432 { 433 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); 434 } 435 436 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) 437 { 438 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; 439 } 440 441 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) 442 { 443 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); 444 } 445 446 /* Called from bottom half context */ 447 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 448 struct receive_queue *rq, 449 struct page *page, unsigned int offset, 450 unsigned int len, unsigned int truesize, 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 buf = p - headroom; 470 len -= hdr_len; 471 offset += hdr_padded_len; 472 p += hdr_padded_len; 473 tailroom = truesize - headroom - hdr_padded_len - len; 474 475 shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 476 477 /* copy small packet so we can reuse these pages */ 478 if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) { 479 skb = build_skb(buf, truesize); 480 if (unlikely(!skb)) 481 return NULL; 482 483 skb_reserve(skb, p - buf); 484 skb_put(skb, len); 485 486 page = (struct page *)page->private; 487 if (page) 488 give_pages(rq, page); 489 goto ok; 490 } 491 492 /* copy small packet so we can reuse these pages for small data */ 493 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 494 if (unlikely(!skb)) 495 return NULL; 496 497 /* Copy all frame if it fits skb->head, otherwise 498 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed. 499 */ 500 if (len <= skb_tailroom(skb)) 501 copy = len; 502 else 503 copy = ETH_HLEN; 504 skb_put_data(skb, p, copy); 505 506 len -= copy; 507 offset += copy; 508 509 if (vi->mergeable_rx_bufs) { 510 if (len) 511 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 512 else 513 page_to_free = page; 514 goto ok; 515 } 516 517 /* 518 * Verify that we can indeed put this data into a skb. 519 * This is here to handle cases when the device erroneously 520 * tries to receive more than is possible. This is usually 521 * the case of a broken device. 522 */ 523 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 524 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 525 dev_kfree_skb(skb); 526 return NULL; 527 } 528 BUG_ON(offset >= PAGE_SIZE); 529 while (len) { 530 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 531 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 532 frag_size, truesize); 533 len -= frag_size; 534 page = (struct page *)page->private; 535 offset = 0; 536 } 537 538 if (page) 539 give_pages(rq, page); 540 541 ok: 542 hdr = skb_vnet_hdr(skb); 543 memcpy(hdr, hdr_p, hdr_len); 544 if (page_to_free) 545 put_page(page_to_free); 546 547 return skb; 548 } 549 550 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) 551 { 552 unsigned int len; 553 unsigned int packets = 0; 554 unsigned int bytes = 0; 555 void *ptr; 556 557 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 558 if (likely(!is_xdp_frame(ptr))) { 559 struct sk_buff *skb = ptr; 560 561 pr_debug("Sent skb %p\n", skb); 562 563 bytes += skb->len; 564 napi_consume_skb(skb, in_napi); 565 } else { 566 struct xdp_frame *frame = ptr_to_xdp(ptr); 567 568 bytes += xdp_get_frame_len(frame); 569 xdp_return_frame(frame); 570 } 571 packets++; 572 } 573 574 /* Avoid overhead when no packets have been processed 575 * happens when called speculatively from start_xmit. 576 */ 577 if (!packets) 578 return; 579 580 u64_stats_update_begin(&sq->stats.syncp); 581 sq->stats.bytes += bytes; 582 sq->stats.packets += packets; 583 u64_stats_update_end(&sq->stats.syncp); 584 } 585 586 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) 587 { 588 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) 589 return false; 590 else if (q < vi->curr_queue_pairs) 591 return true; 592 else 593 return false; 594 } 595 596 static void check_sq_full_and_disable(struct virtnet_info *vi, 597 struct net_device *dev, 598 struct send_queue *sq) 599 { 600 bool use_napi = sq->napi.weight; 601 int qnum; 602 603 qnum = sq - vi->sq; 604 605 /* If running out of space, stop queue to avoid getting packets that we 606 * are then unable to transmit. 607 * An alternative would be to force queuing layer to requeue the skb by 608 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 609 * returned in a normal path of operation: it means that driver is not 610 * maintaining the TX queue stop/start state properly, and causes 611 * the stack to do a non-trivial amount of useless work. 612 * Since most packets only take 1 or 2 ring slots, stopping the queue 613 * early means 16 slots are typically wasted. 614 */ 615 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 616 netif_stop_subqueue(dev, qnum); 617 if (use_napi) { 618 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) 619 virtqueue_napi_schedule(&sq->napi, sq->vq); 620 } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 621 /* More just got used, free them then recheck. */ 622 free_old_xmit_skbs(sq, false); 623 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 624 netif_start_subqueue(dev, qnum); 625 virtqueue_disable_cb(sq->vq); 626 } 627 } 628 } 629 } 630 631 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, 632 struct send_queue *sq, 633 struct xdp_frame *xdpf) 634 { 635 struct virtio_net_hdr_mrg_rxbuf *hdr; 636 struct skb_shared_info *shinfo; 637 u8 nr_frags = 0; 638 int err, i; 639 640 if (unlikely(xdpf->headroom < vi->hdr_len)) 641 return -EOVERFLOW; 642 643 if (unlikely(xdp_frame_has_frags(xdpf))) { 644 shinfo = xdp_get_shared_info_from_frame(xdpf); 645 nr_frags = shinfo->nr_frags; 646 } 647 648 /* In wrapping function virtnet_xdp_xmit(), we need to free 649 * up the pending old buffers, where we need to calculate the 650 * position of skb_shared_info in xdp_get_frame_len() and 651 * xdp_return_frame(), which will involve to xdpf->data and 652 * xdpf->headroom. Therefore, we need to update the value of 653 * headroom synchronously here. 654 */ 655 xdpf->headroom -= vi->hdr_len; 656 xdpf->data -= vi->hdr_len; 657 /* Zero header and leave csum up to XDP layers */ 658 hdr = xdpf->data; 659 memset(hdr, 0, vi->hdr_len); 660 xdpf->len += vi->hdr_len; 661 662 sg_init_table(sq->sg, nr_frags + 1); 663 sg_set_buf(sq->sg, xdpf->data, xdpf->len); 664 for (i = 0; i < nr_frags; i++) { 665 skb_frag_t *frag = &shinfo->frags[i]; 666 667 sg_set_page(&sq->sg[i + 1], skb_frag_page(frag), 668 skb_frag_size(frag), skb_frag_off(frag)); 669 } 670 671 err = virtqueue_add_outbuf(sq->vq, sq->sg, nr_frags + 1, 672 xdp_to_ptr(xdpf), GFP_ATOMIC); 673 if (unlikely(err)) 674 return -ENOSPC; /* Caller handle free/refcnt */ 675 676 return 0; 677 } 678 679 /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on 680 * the current cpu, so it does not need to be locked. 681 * 682 * Here we use marco instead of inline functions because we have to deal with 683 * three issues at the same time: 1. the choice of sq. 2. judge and execute the 684 * lock/unlock of txq 3. make sparse happy. It is difficult for two inline 685 * functions to perfectly solve these three problems at the same time. 686 */ 687 #define virtnet_xdp_get_sq(vi) ({ \ 688 int cpu = smp_processor_id(); \ 689 struct netdev_queue *txq; \ 690 typeof(vi) v = (vi); \ 691 unsigned int qp; \ 692 \ 693 if (v->curr_queue_pairs > nr_cpu_ids) { \ 694 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ 695 qp += cpu; \ 696 txq = netdev_get_tx_queue(v->dev, qp); \ 697 __netif_tx_acquire(txq); \ 698 } else { \ 699 qp = cpu % v->curr_queue_pairs; \ 700 txq = netdev_get_tx_queue(v->dev, qp); \ 701 __netif_tx_lock(txq, cpu); \ 702 } \ 703 v->sq + qp; \ 704 }) 705 706 #define virtnet_xdp_put_sq(vi, q) { \ 707 struct netdev_queue *txq; \ 708 typeof(vi) v = (vi); \ 709 \ 710 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \ 711 if (v->curr_queue_pairs > nr_cpu_ids) \ 712 __netif_tx_release(txq); \ 713 else \ 714 __netif_tx_unlock(txq); \ 715 } 716 717 static int virtnet_xdp_xmit(struct net_device *dev, 718 int n, struct xdp_frame **frames, u32 flags) 719 { 720 struct virtnet_info *vi = netdev_priv(dev); 721 struct receive_queue *rq = vi->rq; 722 struct bpf_prog *xdp_prog; 723 struct send_queue *sq; 724 unsigned int len; 725 int packets = 0; 726 int bytes = 0; 727 int nxmit = 0; 728 int kicks = 0; 729 void *ptr; 730 int ret; 731 int i; 732 733 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this 734 * indicate XDP resources have been successfully allocated. 735 */ 736 xdp_prog = rcu_access_pointer(rq->xdp_prog); 737 if (!xdp_prog) 738 return -ENXIO; 739 740 sq = virtnet_xdp_get_sq(vi); 741 742 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { 743 ret = -EINVAL; 744 goto out; 745 } 746 747 /* Free up any pending old buffers before queueing new ones. */ 748 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 749 if (likely(is_xdp_frame(ptr))) { 750 struct xdp_frame *frame = ptr_to_xdp(ptr); 751 752 bytes += xdp_get_frame_len(frame); 753 xdp_return_frame(frame); 754 } else { 755 struct sk_buff *skb = ptr; 756 757 bytes += skb->len; 758 napi_consume_skb(skb, false); 759 } 760 packets++; 761 } 762 763 for (i = 0; i < n; i++) { 764 struct xdp_frame *xdpf = frames[i]; 765 766 if (__virtnet_xdp_xmit_one(vi, sq, xdpf)) 767 break; 768 nxmit++; 769 } 770 ret = nxmit; 771 772 if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq)) 773 check_sq_full_and_disable(vi, dev, sq); 774 775 if (flags & XDP_XMIT_FLUSH) { 776 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 777 kicks = 1; 778 } 779 out: 780 u64_stats_update_begin(&sq->stats.syncp); 781 sq->stats.bytes += bytes; 782 sq->stats.packets += packets; 783 sq->stats.xdp_tx += n; 784 sq->stats.xdp_tx_drops += n - nxmit; 785 sq->stats.kicks += kicks; 786 u64_stats_update_end(&sq->stats.syncp); 787 788 virtnet_xdp_put_sq(vi, sq); 789 return ret; 790 } 791 792 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 793 { 794 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0; 795 } 796 797 /* We copy the packet for XDP in the following cases: 798 * 799 * 1) Packet is scattered across multiple rx buffers. 800 * 2) Headroom space is insufficient. 801 * 802 * This is inefficient but it's a temporary condition that 803 * we hit right after XDP is enabled and until queue is refilled 804 * with large buffers with sufficient headroom - so it should affect 805 * at most queue size packets. 806 * Afterwards, the conditions to enable 807 * XDP should preclude the underlying device from sending packets 808 * across multiple buffers (num_buf > 1), and we make sure buffers 809 * have enough headroom. 810 */ 811 static struct page *xdp_linearize_page(struct receive_queue *rq, 812 int *num_buf, 813 struct page *p, 814 int offset, 815 int page_off, 816 unsigned int *len) 817 { 818 struct page *page = alloc_page(GFP_ATOMIC); 819 820 if (!page) 821 return NULL; 822 823 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 824 page_off += *len; 825 826 while (--*num_buf) { 827 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 828 unsigned int buflen; 829 void *buf; 830 int off; 831 832 buf = virtqueue_get_buf(rq->vq, &buflen); 833 if (unlikely(!buf)) 834 goto err_buf; 835 836 p = virt_to_head_page(buf); 837 off = buf - page_address(p); 838 839 /* guard against a misconfigured or uncooperative backend that 840 * is sending packet larger than the MTU. 841 */ 842 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 843 put_page(p); 844 goto err_buf; 845 } 846 847 memcpy(page_address(page) + page_off, 848 page_address(p) + off, buflen); 849 page_off += buflen; 850 put_page(p); 851 } 852 853 /* Headroom does not contribute to packet length */ 854 *len = page_off - VIRTIO_XDP_HEADROOM; 855 return page; 856 err_buf: 857 __free_pages(page, 0); 858 return NULL; 859 } 860 861 static struct sk_buff *receive_small(struct net_device *dev, 862 struct virtnet_info *vi, 863 struct receive_queue *rq, 864 void *buf, void *ctx, 865 unsigned int len, 866 unsigned int *xdp_xmit, 867 struct virtnet_rq_stats *stats) 868 { 869 struct sk_buff *skb; 870 struct bpf_prog *xdp_prog; 871 unsigned int xdp_headroom = (unsigned long)ctx; 872 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 873 unsigned int headroom = vi->hdr_len + header_offset; 874 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 875 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 876 struct page *page = virt_to_head_page(buf); 877 unsigned int delta = 0; 878 struct page *xdp_page; 879 int err; 880 unsigned int metasize = 0; 881 882 len -= vi->hdr_len; 883 stats->bytes += len; 884 885 if (unlikely(len > GOOD_PACKET_LEN)) { 886 pr_debug("%s: rx error: len %u exceeds max size %d\n", 887 dev->name, len, GOOD_PACKET_LEN); 888 dev->stats.rx_length_errors++; 889 goto err; 890 } 891 892 if (likely(!vi->xdp_enabled)) { 893 xdp_prog = NULL; 894 goto skip_xdp; 895 } 896 897 rcu_read_lock(); 898 xdp_prog = rcu_dereference(rq->xdp_prog); 899 if (xdp_prog) { 900 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 901 struct xdp_frame *xdpf; 902 struct xdp_buff xdp; 903 void *orig_data; 904 u32 act; 905 906 if (unlikely(hdr->hdr.gso_type)) 907 goto err_xdp; 908 909 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 910 int offset = buf - page_address(page) + header_offset; 911 unsigned int tlen = len + vi->hdr_len; 912 int num_buf = 1; 913 914 xdp_headroom = virtnet_get_headroom(vi); 915 header_offset = VIRTNET_RX_PAD + xdp_headroom; 916 headroom = vi->hdr_len + header_offset; 917 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 918 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 919 xdp_page = xdp_linearize_page(rq, &num_buf, page, 920 offset, header_offset, 921 &tlen); 922 if (!xdp_page) 923 goto err_xdp; 924 925 buf = page_address(xdp_page); 926 put_page(page); 927 page = xdp_page; 928 } 929 930 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); 931 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, 932 xdp_headroom, len, true); 933 orig_data = xdp.data; 934 act = bpf_prog_run_xdp(xdp_prog, &xdp); 935 stats->xdp_packets++; 936 937 switch (act) { 938 case XDP_PASS: 939 /* Recalculate length in case bpf program changed it */ 940 delta = orig_data - xdp.data; 941 len = xdp.data_end - xdp.data; 942 metasize = xdp.data - xdp.data_meta; 943 break; 944 case XDP_TX: 945 stats->xdp_tx++; 946 xdpf = xdp_convert_buff_to_frame(&xdp); 947 if (unlikely(!xdpf)) 948 goto err_xdp; 949 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 950 if (unlikely(!err)) { 951 xdp_return_frame_rx_napi(xdpf); 952 } else if (unlikely(err < 0)) { 953 trace_xdp_exception(vi->dev, xdp_prog, act); 954 goto err_xdp; 955 } 956 *xdp_xmit |= VIRTIO_XDP_TX; 957 rcu_read_unlock(); 958 goto xdp_xmit; 959 case XDP_REDIRECT: 960 stats->xdp_redirects++; 961 err = xdp_do_redirect(dev, &xdp, xdp_prog); 962 if (err) 963 goto err_xdp; 964 *xdp_xmit |= VIRTIO_XDP_REDIR; 965 rcu_read_unlock(); 966 goto xdp_xmit; 967 default: 968 bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); 969 fallthrough; 970 case XDP_ABORTED: 971 trace_xdp_exception(vi->dev, xdp_prog, act); 972 goto err_xdp; 973 case XDP_DROP: 974 goto err_xdp; 975 } 976 } 977 rcu_read_unlock(); 978 979 skip_xdp: 980 skb = build_skb(buf, buflen); 981 if (!skb) 982 goto err; 983 skb_reserve(skb, headroom - delta); 984 skb_put(skb, len); 985 if (!xdp_prog) { 986 buf += header_offset; 987 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 988 } /* keep zeroed vnet hdr since XDP is loaded */ 989 990 if (metasize) 991 skb_metadata_set(skb, metasize); 992 993 return skb; 994 995 err_xdp: 996 rcu_read_unlock(); 997 stats->xdp_drops++; 998 err: 999 stats->drops++; 1000 put_page(page); 1001 xdp_xmit: 1002 return NULL; 1003 } 1004 1005 static struct sk_buff *receive_big(struct net_device *dev, 1006 struct virtnet_info *vi, 1007 struct receive_queue *rq, 1008 void *buf, 1009 unsigned int len, 1010 struct virtnet_rq_stats *stats) 1011 { 1012 struct page *page = buf; 1013 struct sk_buff *skb = 1014 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0); 1015 1016 stats->bytes += len - vi->hdr_len; 1017 if (unlikely(!skb)) 1018 goto err; 1019 1020 return skb; 1021 1022 err: 1023 stats->drops++; 1024 give_pages(rq, page); 1025 return NULL; 1026 } 1027 1028 /* Why not use xdp_build_skb_from_frame() ? 1029 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in 1030 * virtio-net there are 2 points that do not match its requirements: 1031 * 1. The size of the prefilled buffer is not fixed before xdp is set. 1032 * 2. xdp_build_skb_from_frame() does more checks that we don't need, 1033 * like eth_type_trans() (which virtio-net does in receive_buf()). 1034 */ 1035 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev, 1036 struct virtnet_info *vi, 1037 struct xdp_buff *xdp, 1038 unsigned int xdp_frags_truesz) 1039 { 1040 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 1041 unsigned int headroom, data_len; 1042 struct sk_buff *skb; 1043 int metasize; 1044 u8 nr_frags; 1045 1046 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 1047 pr_debug("Error building skb as missing reserved tailroom for xdp"); 1048 return NULL; 1049 } 1050 1051 if (unlikely(xdp_buff_has_frags(xdp))) 1052 nr_frags = sinfo->nr_frags; 1053 1054 skb = build_skb(xdp->data_hard_start, xdp->frame_sz); 1055 if (unlikely(!skb)) 1056 return NULL; 1057 1058 headroom = xdp->data - xdp->data_hard_start; 1059 data_len = xdp->data_end - xdp->data; 1060 skb_reserve(skb, headroom); 1061 __skb_put(skb, data_len); 1062 1063 metasize = xdp->data - xdp->data_meta; 1064 metasize = metasize > 0 ? metasize : 0; 1065 if (metasize) 1066 skb_metadata_set(skb, metasize); 1067 1068 if (unlikely(xdp_buff_has_frags(xdp))) 1069 xdp_update_skb_shared_info(skb, nr_frags, 1070 sinfo->xdp_frags_size, 1071 xdp_frags_truesz, 1072 xdp_buff_is_frag_pfmemalloc(xdp)); 1073 1074 return skb; 1075 } 1076 1077 /* TODO: build xdp in big mode */ 1078 static int virtnet_build_xdp_buff_mrg(struct net_device *dev, 1079 struct virtnet_info *vi, 1080 struct receive_queue *rq, 1081 struct xdp_buff *xdp, 1082 void *buf, 1083 unsigned int len, 1084 unsigned int frame_sz, 1085 int *num_buf, 1086 unsigned int *xdp_frags_truesize, 1087 struct virtnet_rq_stats *stats) 1088 { 1089 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1090 unsigned int headroom, tailroom, room; 1091 unsigned int truesize, cur_frag_size; 1092 struct skb_shared_info *shinfo; 1093 unsigned int xdp_frags_truesz = 0; 1094 struct page *page; 1095 skb_frag_t *frag; 1096 int offset; 1097 void *ctx; 1098 1099 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); 1100 xdp_prepare_buff(xdp, buf - VIRTIO_XDP_HEADROOM, 1101 VIRTIO_XDP_HEADROOM + vi->hdr_len, len - vi->hdr_len, true); 1102 1103 if (!*num_buf) 1104 return 0; 1105 1106 if (*num_buf > 1) { 1107 /* If we want to build multi-buffer xdp, we need 1108 * to specify that the flags of xdp_buff have the 1109 * XDP_FLAGS_HAS_FRAG bit. 1110 */ 1111 if (!xdp_buff_has_frags(xdp)) 1112 xdp_buff_set_frags_flag(xdp); 1113 1114 shinfo = xdp_get_shared_info_from_buff(xdp); 1115 shinfo->nr_frags = 0; 1116 shinfo->xdp_frags_size = 0; 1117 } 1118 1119 if (*num_buf > MAX_SKB_FRAGS + 1) 1120 return -EINVAL; 1121 1122 while (--*num_buf > 0) { 1123 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1124 if (unlikely(!buf)) { 1125 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1126 dev->name, *num_buf, 1127 virtio16_to_cpu(vi->vdev, hdr->num_buffers)); 1128 dev->stats.rx_length_errors++; 1129 return -EINVAL; 1130 } 1131 1132 stats->bytes += len; 1133 page = virt_to_head_page(buf); 1134 offset = buf - page_address(page); 1135 1136 truesize = mergeable_ctx_to_truesize(ctx); 1137 headroom = mergeable_ctx_to_headroom(ctx); 1138 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1139 room = SKB_DATA_ALIGN(headroom + tailroom); 1140 1141 cur_frag_size = truesize; 1142 xdp_frags_truesz += cur_frag_size; 1143 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) { 1144 put_page(page); 1145 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1146 dev->name, len, (unsigned long)(truesize - room)); 1147 dev->stats.rx_length_errors++; 1148 return -EINVAL; 1149 } 1150 1151 frag = &shinfo->frags[shinfo->nr_frags++]; 1152 __skb_frag_set_page(frag, page); 1153 skb_frag_off_set(frag, offset); 1154 skb_frag_size_set(frag, len); 1155 if (page_is_pfmemalloc(page)) 1156 xdp_buff_set_frag_pfmemalloc(xdp); 1157 1158 shinfo->xdp_frags_size += len; 1159 } 1160 1161 *xdp_frags_truesize = xdp_frags_truesz; 1162 return 0; 1163 } 1164 1165 static struct sk_buff *receive_mergeable(struct net_device *dev, 1166 struct virtnet_info *vi, 1167 struct receive_queue *rq, 1168 void *buf, 1169 void *ctx, 1170 unsigned int len, 1171 unsigned int *xdp_xmit, 1172 struct virtnet_rq_stats *stats) 1173 { 1174 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1175 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 1176 struct page *page = virt_to_head_page(buf); 1177 int offset = buf - page_address(page); 1178 struct sk_buff *head_skb, *curr_skb; 1179 struct bpf_prog *xdp_prog; 1180 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1181 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1182 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1183 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1184 unsigned int frame_sz, xdp_room; 1185 int err; 1186 1187 head_skb = NULL; 1188 stats->bytes += len - vi->hdr_len; 1189 1190 if (unlikely(len > truesize - room)) { 1191 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1192 dev->name, len, (unsigned long)(truesize - room)); 1193 dev->stats.rx_length_errors++; 1194 goto err_skb; 1195 } 1196 1197 if (likely(!vi->xdp_enabled)) { 1198 xdp_prog = NULL; 1199 goto skip_xdp; 1200 } 1201 1202 rcu_read_lock(); 1203 xdp_prog = rcu_dereference(rq->xdp_prog); 1204 if (xdp_prog) { 1205 unsigned int xdp_frags_truesz = 0; 1206 struct skb_shared_info *shinfo; 1207 struct xdp_frame *xdpf; 1208 struct page *xdp_page; 1209 struct xdp_buff xdp; 1210 void *data; 1211 u32 act; 1212 int i; 1213 1214 /* Transient failure which in theory could occur if 1215 * in-flight packets from before XDP was enabled reach 1216 * the receive path after XDP is loaded. 1217 */ 1218 if (unlikely(hdr->hdr.gso_type)) 1219 goto err_xdp; 1220 1221 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers 1222 * with headroom may add hole in truesize, which 1223 * make their length exceed PAGE_SIZE. So we disabled the 1224 * hole mechanism for xdp. See add_recvbuf_mergeable(). 1225 */ 1226 frame_sz = truesize; 1227 1228 /* This happens when headroom is not enough because 1229 * of the buffer was prefilled before XDP is set. 1230 * This should only happen for the first several packets. 1231 * In fact, vq reset can be used here to help us clean up 1232 * the prefilled buffers, but many existing devices do not 1233 * support it, and we don't want to bother users who are 1234 * using xdp normally. 1235 */ 1236 if (!xdp_prog->aux->xdp_has_frags && 1237 (num_buf > 1 || headroom < virtnet_get_headroom(vi))) { 1238 /* linearize data for XDP */ 1239 xdp_page = xdp_linearize_page(rq, &num_buf, 1240 page, offset, 1241 VIRTIO_XDP_HEADROOM, 1242 &len); 1243 frame_sz = PAGE_SIZE; 1244 1245 if (!xdp_page) 1246 goto err_xdp; 1247 offset = VIRTIO_XDP_HEADROOM; 1248 } else if (unlikely(headroom < virtnet_get_headroom(vi))) { 1249 xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 1250 sizeof(struct skb_shared_info)); 1251 if (len + xdp_room > PAGE_SIZE) 1252 goto err_xdp; 1253 1254 xdp_page = alloc_page(GFP_ATOMIC); 1255 if (!xdp_page) 1256 goto err_xdp; 1257 1258 memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM, 1259 page_address(page) + offset, len); 1260 frame_sz = PAGE_SIZE; 1261 offset = VIRTIO_XDP_HEADROOM; 1262 } else { 1263 xdp_page = page; 1264 } 1265 1266 data = page_address(xdp_page) + offset; 1267 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz, 1268 &num_buf, &xdp_frags_truesz, stats); 1269 if (unlikely(err)) 1270 goto err_xdp_frags; 1271 1272 act = bpf_prog_run_xdp(xdp_prog, &xdp); 1273 stats->xdp_packets++; 1274 1275 switch (act) { 1276 case XDP_PASS: 1277 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); 1278 if (unlikely(!head_skb)) 1279 goto err_xdp_frags; 1280 1281 if (unlikely(xdp_page != page)) 1282 put_page(page); 1283 rcu_read_unlock(); 1284 return head_skb; 1285 case XDP_TX: 1286 stats->xdp_tx++; 1287 xdpf = xdp_convert_buff_to_frame(&xdp); 1288 if (unlikely(!xdpf)) { 1289 netdev_dbg(dev, "convert buff to frame failed for xdp\n"); 1290 goto err_xdp_frags; 1291 } 1292 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 1293 if (unlikely(!err)) { 1294 xdp_return_frame_rx_napi(xdpf); 1295 } else if (unlikely(err < 0)) { 1296 trace_xdp_exception(vi->dev, xdp_prog, act); 1297 goto err_xdp_frags; 1298 } 1299 *xdp_xmit |= VIRTIO_XDP_TX; 1300 if (unlikely(xdp_page != page)) 1301 put_page(page); 1302 rcu_read_unlock(); 1303 goto xdp_xmit; 1304 case XDP_REDIRECT: 1305 stats->xdp_redirects++; 1306 err = xdp_do_redirect(dev, &xdp, xdp_prog); 1307 if (err) 1308 goto err_xdp_frags; 1309 *xdp_xmit |= VIRTIO_XDP_REDIR; 1310 if (unlikely(xdp_page != page)) 1311 put_page(page); 1312 rcu_read_unlock(); 1313 goto xdp_xmit; 1314 default: 1315 bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); 1316 fallthrough; 1317 case XDP_ABORTED: 1318 trace_xdp_exception(vi->dev, xdp_prog, act); 1319 fallthrough; 1320 case XDP_DROP: 1321 goto err_xdp_frags; 1322 } 1323 err_xdp_frags: 1324 if (unlikely(xdp_page != page)) 1325 __free_pages(xdp_page, 0); 1326 1327 if (xdp_buff_has_frags(&xdp)) { 1328 shinfo = xdp_get_shared_info_from_buff(&xdp); 1329 for (i = 0; i < shinfo->nr_frags; i++) { 1330 xdp_page = skb_frag_page(&shinfo->frags[i]); 1331 put_page(xdp_page); 1332 } 1333 } 1334 1335 goto err_xdp; 1336 } 1337 rcu_read_unlock(); 1338 1339 skip_xdp: 1340 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom); 1341 curr_skb = head_skb; 1342 1343 if (unlikely(!curr_skb)) 1344 goto err_skb; 1345 while (--num_buf) { 1346 int num_skb_frags; 1347 1348 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1349 if (unlikely(!buf)) { 1350 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1351 dev->name, num_buf, 1352 virtio16_to_cpu(vi->vdev, 1353 hdr->num_buffers)); 1354 dev->stats.rx_length_errors++; 1355 goto err_buf; 1356 } 1357 1358 stats->bytes += len; 1359 page = virt_to_head_page(buf); 1360 1361 truesize = mergeable_ctx_to_truesize(ctx); 1362 headroom = mergeable_ctx_to_headroom(ctx); 1363 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1364 room = SKB_DATA_ALIGN(headroom + tailroom); 1365 if (unlikely(len > truesize - room)) { 1366 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1367 dev->name, len, (unsigned long)(truesize - room)); 1368 dev->stats.rx_length_errors++; 1369 goto err_skb; 1370 } 1371 1372 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 1373 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 1374 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 1375 1376 if (unlikely(!nskb)) 1377 goto err_skb; 1378 if (curr_skb == head_skb) 1379 skb_shinfo(curr_skb)->frag_list = nskb; 1380 else 1381 curr_skb->next = nskb; 1382 curr_skb = nskb; 1383 head_skb->truesize += nskb->truesize; 1384 num_skb_frags = 0; 1385 } 1386 if (curr_skb != head_skb) { 1387 head_skb->data_len += len; 1388 head_skb->len += len; 1389 head_skb->truesize += truesize; 1390 } 1391 offset = buf - page_address(page); 1392 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 1393 put_page(page); 1394 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 1395 len, truesize); 1396 } else { 1397 skb_add_rx_frag(curr_skb, num_skb_frags, page, 1398 offset, len, truesize); 1399 } 1400 } 1401 1402 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 1403 return head_skb; 1404 1405 err_xdp: 1406 rcu_read_unlock(); 1407 stats->xdp_drops++; 1408 err_skb: 1409 put_page(page); 1410 while (num_buf-- > 1) { 1411 buf = virtqueue_get_buf(rq->vq, &len); 1412 if (unlikely(!buf)) { 1413 pr_debug("%s: rx error: %d buffers missing\n", 1414 dev->name, num_buf); 1415 dev->stats.rx_length_errors++; 1416 break; 1417 } 1418 stats->bytes += len; 1419 page = virt_to_head_page(buf); 1420 put_page(page); 1421 } 1422 err_buf: 1423 stats->drops++; 1424 dev_kfree_skb(head_skb); 1425 xdp_xmit: 1426 return NULL; 1427 } 1428 1429 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash, 1430 struct sk_buff *skb) 1431 { 1432 enum pkt_hash_types rss_hash_type; 1433 1434 if (!hdr_hash || !skb) 1435 return; 1436 1437 switch (__le16_to_cpu(hdr_hash->hash_report)) { 1438 case VIRTIO_NET_HASH_REPORT_TCPv4: 1439 case VIRTIO_NET_HASH_REPORT_UDPv4: 1440 case VIRTIO_NET_HASH_REPORT_TCPv6: 1441 case VIRTIO_NET_HASH_REPORT_UDPv6: 1442 case VIRTIO_NET_HASH_REPORT_TCPv6_EX: 1443 case VIRTIO_NET_HASH_REPORT_UDPv6_EX: 1444 rss_hash_type = PKT_HASH_TYPE_L4; 1445 break; 1446 case VIRTIO_NET_HASH_REPORT_IPv4: 1447 case VIRTIO_NET_HASH_REPORT_IPv6: 1448 case VIRTIO_NET_HASH_REPORT_IPv6_EX: 1449 rss_hash_type = PKT_HASH_TYPE_L3; 1450 break; 1451 case VIRTIO_NET_HASH_REPORT_NONE: 1452 default: 1453 rss_hash_type = PKT_HASH_TYPE_NONE; 1454 } 1455 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type); 1456 } 1457 1458 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 1459 void *buf, unsigned int len, void **ctx, 1460 unsigned int *xdp_xmit, 1461 struct virtnet_rq_stats *stats) 1462 { 1463 struct net_device *dev = vi->dev; 1464 struct sk_buff *skb; 1465 struct virtio_net_hdr_mrg_rxbuf *hdr; 1466 1467 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1468 pr_debug("%s: short packet %i\n", dev->name, len); 1469 dev->stats.rx_length_errors++; 1470 virtnet_rq_free_unused_buf(rq->vq, buf); 1471 return; 1472 } 1473 1474 if (vi->mergeable_rx_bufs) 1475 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1476 stats); 1477 else if (vi->big_packets) 1478 skb = receive_big(dev, vi, rq, buf, len, stats); 1479 else 1480 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1481 1482 if (unlikely(!skb)) 1483 return; 1484 1485 hdr = skb_vnet_hdr(skb); 1486 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report) 1487 virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb); 1488 1489 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1490 skb->ip_summed = CHECKSUM_UNNECESSARY; 1491 1492 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1493 virtio_is_little_endian(vi->vdev))) { 1494 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1495 dev->name, hdr->hdr.gso_type, 1496 hdr->hdr.gso_size); 1497 goto frame_err; 1498 } 1499 1500 skb_record_rx_queue(skb, vq2rxq(rq->vq)); 1501 skb->protocol = eth_type_trans(skb, dev); 1502 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1503 ntohs(skb->protocol), skb->len, skb->pkt_type); 1504 1505 napi_gro_receive(&rq->napi, skb); 1506 return; 1507 1508 frame_err: 1509 dev->stats.rx_frame_errors++; 1510 dev_kfree_skb(skb); 1511 } 1512 1513 /* Unlike mergeable buffers, all buffers are allocated to the 1514 * same size, except for the headroom. For this reason we do 1515 * not need to use mergeable_len_to_ctx here - it is enough 1516 * to store the headroom as the context ignoring the truesize. 1517 */ 1518 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1519 gfp_t gfp) 1520 { 1521 struct page_frag *alloc_frag = &rq->alloc_frag; 1522 char *buf; 1523 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1524 void *ctx = (void *)(unsigned long)xdp_headroom; 1525 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1526 int err; 1527 1528 len = SKB_DATA_ALIGN(len) + 1529 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1530 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1531 return -ENOMEM; 1532 1533 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1534 get_page(alloc_frag->page); 1535 alloc_frag->offset += len; 1536 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1537 vi->hdr_len + GOOD_PACKET_LEN); 1538 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1539 if (err < 0) 1540 put_page(virt_to_head_page(buf)); 1541 return err; 1542 } 1543 1544 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1545 gfp_t gfp) 1546 { 1547 struct page *first, *list = NULL; 1548 char *p; 1549 int i, err, offset; 1550 1551 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2); 1552 1553 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */ 1554 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) { 1555 first = get_a_page(rq, gfp); 1556 if (!first) { 1557 if (list) 1558 give_pages(rq, list); 1559 return -ENOMEM; 1560 } 1561 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1562 1563 /* chain new page in list head to match sg */ 1564 first->private = (unsigned long)list; 1565 list = first; 1566 } 1567 1568 first = get_a_page(rq, gfp); 1569 if (!first) { 1570 give_pages(rq, list); 1571 return -ENOMEM; 1572 } 1573 p = page_address(first); 1574 1575 /* rq->sg[0], rq->sg[1] share the same page */ 1576 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1577 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1578 1579 /* rq->sg[1] for data packet, from offset */ 1580 offset = sizeof(struct padded_vnet_hdr); 1581 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1582 1583 /* chain first in list head */ 1584 first->private = (unsigned long)list; 1585 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2, 1586 first, gfp); 1587 if (err < 0) 1588 give_pages(rq, first); 1589 1590 return err; 1591 } 1592 1593 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1594 struct ewma_pkt_len *avg_pkt_len, 1595 unsigned int room) 1596 { 1597 struct virtnet_info *vi = rq->vq->vdev->priv; 1598 const size_t hdr_len = vi->hdr_len; 1599 unsigned int len; 1600 1601 if (room) 1602 return PAGE_SIZE - room; 1603 1604 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1605 rq->min_buf_len, PAGE_SIZE - hdr_len); 1606 1607 return ALIGN(len, L1_CACHE_BYTES); 1608 } 1609 1610 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1611 struct receive_queue *rq, gfp_t gfp) 1612 { 1613 struct page_frag *alloc_frag = &rq->alloc_frag; 1614 unsigned int headroom = virtnet_get_headroom(vi); 1615 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1616 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1617 char *buf; 1618 void *ctx; 1619 int err; 1620 unsigned int len, hole; 1621 1622 /* Extra tailroom is needed to satisfy XDP's assumption. This 1623 * means rx frags coalescing won't work, but consider we've 1624 * disabled GSO for XDP, it won't be a big issue. 1625 */ 1626 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1627 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1628 return -ENOMEM; 1629 1630 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1631 buf += headroom; /* advance address leaving hole at front of pkt */ 1632 get_page(alloc_frag->page); 1633 alloc_frag->offset += len + room; 1634 hole = alloc_frag->size - alloc_frag->offset; 1635 if (hole < len + room) { 1636 /* To avoid internal fragmentation, if there is very likely not 1637 * enough space for another buffer, add the remaining space to 1638 * the current buffer. 1639 * XDP core assumes that frame_size of xdp_buff and the length 1640 * of the frag are PAGE_SIZE, so we disable the hole mechanism. 1641 */ 1642 if (!headroom) 1643 len += hole; 1644 alloc_frag->offset += hole; 1645 } 1646 1647 sg_init_one(rq->sg, buf, len); 1648 ctx = mergeable_len_to_ctx(len + room, headroom); 1649 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1650 if (err < 0) 1651 put_page(virt_to_head_page(buf)); 1652 1653 return err; 1654 } 1655 1656 /* 1657 * Returns false if we couldn't fill entirely (OOM). 1658 * 1659 * Normally run in the receive path, but can also be run from ndo_open 1660 * before we're receiving packets, or from refill_work which is 1661 * careful to disable receiving (using napi_disable). 1662 */ 1663 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1664 gfp_t gfp) 1665 { 1666 int err; 1667 bool oom; 1668 1669 do { 1670 if (vi->mergeable_rx_bufs) 1671 err = add_recvbuf_mergeable(vi, rq, gfp); 1672 else if (vi->big_packets) 1673 err = add_recvbuf_big(vi, rq, gfp); 1674 else 1675 err = add_recvbuf_small(vi, rq, gfp); 1676 1677 oom = err == -ENOMEM; 1678 if (err) 1679 break; 1680 } while (rq->vq->num_free); 1681 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1682 unsigned long flags; 1683 1684 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); 1685 rq->stats.kicks++; 1686 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); 1687 } 1688 1689 return !oom; 1690 } 1691 1692 static void skb_recv_done(struct virtqueue *rvq) 1693 { 1694 struct virtnet_info *vi = rvq->vdev->priv; 1695 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1696 1697 virtqueue_napi_schedule(&rq->napi, rvq); 1698 } 1699 1700 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1701 { 1702 napi_enable(napi); 1703 1704 /* If all buffers were filled by other side before we napi_enabled, we 1705 * won't get another interrupt, so process any outstanding packets now. 1706 * Call local_bh_enable after to trigger softIRQ processing. 1707 */ 1708 local_bh_disable(); 1709 virtqueue_napi_schedule(napi, vq); 1710 local_bh_enable(); 1711 } 1712 1713 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1714 struct virtqueue *vq, 1715 struct napi_struct *napi) 1716 { 1717 if (!napi->weight) 1718 return; 1719 1720 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1721 * enable the feature if this is likely affine with the transmit path. 1722 */ 1723 if (!vi->affinity_hint_set) { 1724 napi->weight = 0; 1725 return; 1726 } 1727 1728 return virtnet_napi_enable(vq, napi); 1729 } 1730 1731 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1732 { 1733 if (napi->weight) 1734 napi_disable(napi); 1735 } 1736 1737 static void refill_work(struct work_struct *work) 1738 { 1739 struct virtnet_info *vi = 1740 container_of(work, struct virtnet_info, refill.work); 1741 bool still_empty; 1742 int i; 1743 1744 for (i = 0; i < vi->curr_queue_pairs; i++) { 1745 struct receive_queue *rq = &vi->rq[i]; 1746 1747 napi_disable(&rq->napi); 1748 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1749 virtnet_napi_enable(rq->vq, &rq->napi); 1750 1751 /* In theory, this can happen: if we don't get any buffers in 1752 * we will *never* try to fill again. 1753 */ 1754 if (still_empty) 1755 schedule_delayed_work(&vi->refill, HZ/2); 1756 } 1757 } 1758 1759 static int virtnet_receive(struct receive_queue *rq, int budget, 1760 unsigned int *xdp_xmit) 1761 { 1762 struct virtnet_info *vi = rq->vq->vdev->priv; 1763 struct virtnet_rq_stats stats = {}; 1764 unsigned int len; 1765 void *buf; 1766 int i; 1767 1768 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1769 void *ctx; 1770 1771 while (stats.packets < budget && 1772 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1773 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1774 stats.packets++; 1775 } 1776 } else { 1777 while (stats.packets < budget && 1778 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1779 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1780 stats.packets++; 1781 } 1782 } 1783 1784 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { 1785 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { 1786 spin_lock(&vi->refill_lock); 1787 if (vi->refill_enabled) 1788 schedule_delayed_work(&vi->refill, 0); 1789 spin_unlock(&vi->refill_lock); 1790 } 1791 } 1792 1793 u64_stats_update_begin(&rq->stats.syncp); 1794 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1795 size_t offset = virtnet_rq_stats_desc[i].offset; 1796 u64 *item; 1797 1798 item = (u64 *)((u8 *)&rq->stats + offset); 1799 *item += *(u64 *)((u8 *)&stats + offset); 1800 } 1801 u64_stats_update_end(&rq->stats.syncp); 1802 1803 return stats.packets; 1804 } 1805 1806 static void virtnet_poll_cleantx(struct receive_queue *rq) 1807 { 1808 struct virtnet_info *vi = rq->vq->vdev->priv; 1809 unsigned int index = vq2rxq(rq->vq); 1810 struct send_queue *sq = &vi->sq[index]; 1811 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1812 1813 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) 1814 return; 1815 1816 if (__netif_tx_trylock(txq)) { 1817 if (sq->reset) { 1818 __netif_tx_unlock(txq); 1819 return; 1820 } 1821 1822 do { 1823 virtqueue_disable_cb(sq->vq); 1824 free_old_xmit_skbs(sq, true); 1825 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 1826 1827 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1828 netif_tx_wake_queue(txq); 1829 1830 __netif_tx_unlock(txq); 1831 } 1832 } 1833 1834 static int virtnet_poll(struct napi_struct *napi, int budget) 1835 { 1836 struct receive_queue *rq = 1837 container_of(napi, struct receive_queue, napi); 1838 struct virtnet_info *vi = rq->vq->vdev->priv; 1839 struct send_queue *sq; 1840 unsigned int received; 1841 unsigned int xdp_xmit = 0; 1842 1843 virtnet_poll_cleantx(rq); 1844 1845 received = virtnet_receive(rq, budget, &xdp_xmit); 1846 1847 if (xdp_xmit & VIRTIO_XDP_REDIR) 1848 xdp_do_flush(); 1849 1850 /* Out of packets? */ 1851 if (received < budget) 1852 virtqueue_napi_complete(napi, rq->vq, received); 1853 1854 if (xdp_xmit & VIRTIO_XDP_TX) { 1855 sq = virtnet_xdp_get_sq(vi); 1856 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1857 u64_stats_update_begin(&sq->stats.syncp); 1858 sq->stats.kicks++; 1859 u64_stats_update_end(&sq->stats.syncp); 1860 } 1861 virtnet_xdp_put_sq(vi, sq); 1862 } 1863 1864 return received; 1865 } 1866 1867 static int virtnet_open(struct net_device *dev) 1868 { 1869 struct virtnet_info *vi = netdev_priv(dev); 1870 int i, err; 1871 1872 enable_delayed_refill(vi); 1873 1874 for (i = 0; i < vi->max_queue_pairs; i++) { 1875 if (i < vi->curr_queue_pairs) 1876 /* Make sure we have some buffers: if oom use wq. */ 1877 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1878 schedule_delayed_work(&vi->refill, 0); 1879 1880 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id); 1881 if (err < 0) 1882 return err; 1883 1884 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, 1885 MEM_TYPE_PAGE_SHARED, NULL); 1886 if (err < 0) { 1887 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1888 return err; 1889 } 1890 1891 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 1892 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); 1893 } 1894 1895 return 0; 1896 } 1897 1898 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1899 { 1900 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1901 struct virtnet_info *vi = sq->vq->vdev->priv; 1902 unsigned int index = vq2txq(sq->vq); 1903 struct netdev_queue *txq; 1904 int opaque; 1905 bool done; 1906 1907 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { 1908 /* We don't need to enable cb for XDP */ 1909 napi_complete_done(napi, 0); 1910 return 0; 1911 } 1912 1913 txq = netdev_get_tx_queue(vi->dev, index); 1914 __netif_tx_lock(txq, raw_smp_processor_id()); 1915 virtqueue_disable_cb(sq->vq); 1916 free_old_xmit_skbs(sq, true); 1917 1918 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1919 netif_tx_wake_queue(txq); 1920 1921 opaque = virtqueue_enable_cb_prepare(sq->vq); 1922 1923 done = napi_complete_done(napi, 0); 1924 1925 if (!done) 1926 virtqueue_disable_cb(sq->vq); 1927 1928 __netif_tx_unlock(txq); 1929 1930 if (done) { 1931 if (unlikely(virtqueue_poll(sq->vq, opaque))) { 1932 if (napi_schedule_prep(napi)) { 1933 __netif_tx_lock(txq, raw_smp_processor_id()); 1934 virtqueue_disable_cb(sq->vq); 1935 __netif_tx_unlock(txq); 1936 __napi_schedule(napi); 1937 } 1938 } 1939 } 1940 1941 return 0; 1942 } 1943 1944 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1945 { 1946 struct virtio_net_hdr_mrg_rxbuf *hdr; 1947 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1948 struct virtnet_info *vi = sq->vq->vdev->priv; 1949 int num_sg; 1950 unsigned hdr_len = vi->hdr_len; 1951 bool can_push; 1952 1953 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1954 1955 can_push = vi->any_header_sg && 1956 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1957 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1958 /* Even if we can, don't push here yet as this would skew 1959 * csum_start offset below. */ 1960 if (can_push) 1961 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 1962 else 1963 hdr = skb_vnet_hdr(skb); 1964 1965 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 1966 virtio_is_little_endian(vi->vdev), false, 1967 0)) 1968 return -EPROTO; 1969 1970 if (vi->mergeable_rx_bufs) 1971 hdr->num_buffers = 0; 1972 1973 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 1974 if (can_push) { 1975 __skb_push(skb, hdr_len); 1976 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 1977 if (unlikely(num_sg < 0)) 1978 return num_sg; 1979 /* Pull header back to avoid skew in tx bytes calculations. */ 1980 __skb_pull(skb, hdr_len); 1981 } else { 1982 sg_set_buf(sq->sg, hdr, hdr_len); 1983 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 1984 if (unlikely(num_sg < 0)) 1985 return num_sg; 1986 num_sg++; 1987 } 1988 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 1989 } 1990 1991 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 1992 { 1993 struct virtnet_info *vi = netdev_priv(dev); 1994 int qnum = skb_get_queue_mapping(skb); 1995 struct send_queue *sq = &vi->sq[qnum]; 1996 int err; 1997 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 1998 bool kick = !netdev_xmit_more(); 1999 bool use_napi = sq->napi.weight; 2000 2001 /* Free up any pending old buffers before queueing new ones. */ 2002 do { 2003 if (use_napi) 2004 virtqueue_disable_cb(sq->vq); 2005 2006 free_old_xmit_skbs(sq, false); 2007 2008 } while (use_napi && kick && 2009 unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 2010 2011 /* timestamp packet in software */ 2012 skb_tx_timestamp(skb); 2013 2014 /* Try to transmit */ 2015 err = xmit_skb(sq, skb); 2016 2017 /* This should not happen! */ 2018 if (unlikely(err)) { 2019 dev->stats.tx_fifo_errors++; 2020 if (net_ratelimit()) 2021 dev_warn(&dev->dev, 2022 "Unexpected TXQ (%d) queue failure: %d\n", 2023 qnum, err); 2024 dev->stats.tx_dropped++; 2025 dev_kfree_skb_any(skb); 2026 return NETDEV_TX_OK; 2027 } 2028 2029 /* Don't wait up for transmitted skbs to be freed. */ 2030 if (!use_napi) { 2031 skb_orphan(skb); 2032 nf_reset_ct(skb); 2033 } 2034 2035 check_sq_full_and_disable(vi, dev, sq); 2036 2037 if (kick || netif_xmit_stopped(txq)) { 2038 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 2039 u64_stats_update_begin(&sq->stats.syncp); 2040 sq->stats.kicks++; 2041 u64_stats_update_end(&sq->stats.syncp); 2042 } 2043 } 2044 2045 return NETDEV_TX_OK; 2046 } 2047 2048 static int virtnet_rx_resize(struct virtnet_info *vi, 2049 struct receive_queue *rq, u32 ring_num) 2050 { 2051 bool running = netif_running(vi->dev); 2052 int err, qindex; 2053 2054 qindex = rq - vi->rq; 2055 2056 if (running) 2057 napi_disable(&rq->napi); 2058 2059 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); 2060 if (err) 2061 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); 2062 2063 if (!try_fill_recv(vi, rq, GFP_KERNEL)) 2064 schedule_delayed_work(&vi->refill, 0); 2065 2066 if (running) 2067 virtnet_napi_enable(rq->vq, &rq->napi); 2068 return err; 2069 } 2070 2071 static int virtnet_tx_resize(struct virtnet_info *vi, 2072 struct send_queue *sq, u32 ring_num) 2073 { 2074 bool running = netif_running(vi->dev); 2075 struct netdev_queue *txq; 2076 int err, qindex; 2077 2078 qindex = sq - vi->sq; 2079 2080 if (running) 2081 virtnet_napi_tx_disable(&sq->napi); 2082 2083 txq = netdev_get_tx_queue(vi->dev, qindex); 2084 2085 /* 1. wait all ximt complete 2086 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue() 2087 */ 2088 __netif_tx_lock_bh(txq); 2089 2090 /* Prevent rx poll from accessing sq. */ 2091 sq->reset = true; 2092 2093 /* Prevent the upper layer from trying to send packets. */ 2094 netif_stop_subqueue(vi->dev, qindex); 2095 2096 __netif_tx_unlock_bh(txq); 2097 2098 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf); 2099 if (err) 2100 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err); 2101 2102 __netif_tx_lock_bh(txq); 2103 sq->reset = false; 2104 netif_tx_wake_queue(txq); 2105 __netif_tx_unlock_bh(txq); 2106 2107 if (running) 2108 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi); 2109 return err; 2110 } 2111 2112 /* 2113 * Send command via the control virtqueue and check status. Commands 2114 * supported by the hypervisor, as indicated by feature bits, should 2115 * never fail unless improperly formatted. 2116 */ 2117 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 2118 struct scatterlist *out) 2119 { 2120 struct scatterlist *sgs[4], hdr, stat; 2121 unsigned out_num = 0, tmp; 2122 int ret; 2123 2124 /* Caller should know better */ 2125 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 2126 2127 vi->ctrl->status = ~0; 2128 vi->ctrl->hdr.class = class; 2129 vi->ctrl->hdr.cmd = cmd; 2130 /* Add header */ 2131 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 2132 sgs[out_num++] = &hdr; 2133 2134 if (out) 2135 sgs[out_num++] = out; 2136 2137 /* Add return status. */ 2138 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 2139 sgs[out_num] = &stat; 2140 2141 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 2142 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 2143 if (ret < 0) { 2144 dev_warn(&vi->vdev->dev, 2145 "Failed to add sgs for command vq: %d\n.", ret); 2146 return false; 2147 } 2148 2149 if (unlikely(!virtqueue_kick(vi->cvq))) 2150 return vi->ctrl->status == VIRTIO_NET_OK; 2151 2152 /* Spin for a response, the kick causes an ioport write, trapping 2153 * into the hypervisor, so the request should be handled immediately. 2154 */ 2155 while (!virtqueue_get_buf(vi->cvq, &tmp) && 2156 !virtqueue_is_broken(vi->cvq)) 2157 cpu_relax(); 2158 2159 return vi->ctrl->status == VIRTIO_NET_OK; 2160 } 2161 2162 static int virtnet_set_mac_address(struct net_device *dev, void *p) 2163 { 2164 struct virtnet_info *vi = netdev_priv(dev); 2165 struct virtio_device *vdev = vi->vdev; 2166 int ret; 2167 struct sockaddr *addr; 2168 struct scatterlist sg; 2169 2170 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2171 return -EOPNOTSUPP; 2172 2173 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 2174 if (!addr) 2175 return -ENOMEM; 2176 2177 ret = eth_prepare_mac_addr_change(dev, addr); 2178 if (ret) 2179 goto out; 2180 2181 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 2182 sg_init_one(&sg, addr->sa_data, dev->addr_len); 2183 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2184 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 2185 dev_warn(&vdev->dev, 2186 "Failed to set mac address by vq command.\n"); 2187 ret = -EINVAL; 2188 goto out; 2189 } 2190 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 2191 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 2192 unsigned int i; 2193 2194 /* Naturally, this has an atomicity problem. */ 2195 for (i = 0; i < dev->addr_len; i++) 2196 virtio_cwrite8(vdev, 2197 offsetof(struct virtio_net_config, mac) + 2198 i, addr->sa_data[i]); 2199 } 2200 2201 eth_commit_mac_addr_change(dev, p); 2202 ret = 0; 2203 2204 out: 2205 kfree(addr); 2206 return ret; 2207 } 2208 2209 static void virtnet_stats(struct net_device *dev, 2210 struct rtnl_link_stats64 *tot) 2211 { 2212 struct virtnet_info *vi = netdev_priv(dev); 2213 unsigned int start; 2214 int i; 2215 2216 for (i = 0; i < vi->max_queue_pairs; i++) { 2217 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops; 2218 struct receive_queue *rq = &vi->rq[i]; 2219 struct send_queue *sq = &vi->sq[i]; 2220 2221 do { 2222 start = u64_stats_fetch_begin(&sq->stats.syncp); 2223 tpackets = sq->stats.packets; 2224 tbytes = sq->stats.bytes; 2225 terrors = sq->stats.tx_timeouts; 2226 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2227 2228 do { 2229 start = u64_stats_fetch_begin(&rq->stats.syncp); 2230 rpackets = rq->stats.packets; 2231 rbytes = rq->stats.bytes; 2232 rdrops = rq->stats.drops; 2233 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2234 2235 tot->rx_packets += rpackets; 2236 tot->tx_packets += tpackets; 2237 tot->rx_bytes += rbytes; 2238 tot->tx_bytes += tbytes; 2239 tot->rx_dropped += rdrops; 2240 tot->tx_errors += terrors; 2241 } 2242 2243 tot->tx_dropped = dev->stats.tx_dropped; 2244 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 2245 tot->rx_length_errors = dev->stats.rx_length_errors; 2246 tot->rx_frame_errors = dev->stats.rx_frame_errors; 2247 } 2248 2249 static void virtnet_ack_link_announce(struct virtnet_info *vi) 2250 { 2251 rtnl_lock(); 2252 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 2253 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 2254 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 2255 rtnl_unlock(); 2256 } 2257 2258 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2259 { 2260 struct scatterlist sg; 2261 struct net_device *dev = vi->dev; 2262 2263 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 2264 return 0; 2265 2266 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 2267 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 2268 2269 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2270 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 2271 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 2272 queue_pairs); 2273 return -EINVAL; 2274 } else { 2275 vi->curr_queue_pairs = queue_pairs; 2276 /* virtnet_open() will refill when device is going to up. */ 2277 if (dev->flags & IFF_UP) 2278 schedule_delayed_work(&vi->refill, 0); 2279 } 2280 2281 return 0; 2282 } 2283 2284 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2285 { 2286 int err; 2287 2288 rtnl_lock(); 2289 err = _virtnet_set_queues(vi, queue_pairs); 2290 rtnl_unlock(); 2291 return err; 2292 } 2293 2294 static int virtnet_close(struct net_device *dev) 2295 { 2296 struct virtnet_info *vi = netdev_priv(dev); 2297 int i; 2298 2299 /* Make sure NAPI doesn't schedule refill work */ 2300 disable_delayed_refill(vi); 2301 /* Make sure refill_work doesn't re-enable napi! */ 2302 cancel_delayed_work_sync(&vi->refill); 2303 2304 for (i = 0; i < vi->max_queue_pairs; i++) { 2305 virtnet_napi_tx_disable(&vi->sq[i].napi); 2306 napi_disable(&vi->rq[i].napi); 2307 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 2308 } 2309 2310 return 0; 2311 } 2312 2313 static void virtnet_set_rx_mode(struct net_device *dev) 2314 { 2315 struct virtnet_info *vi = netdev_priv(dev); 2316 struct scatterlist sg[2]; 2317 struct virtio_net_ctrl_mac *mac_data; 2318 struct netdev_hw_addr *ha; 2319 int uc_count; 2320 int mc_count; 2321 void *buf; 2322 int i; 2323 2324 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 2325 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 2326 return; 2327 2328 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 2329 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 2330 2331 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 2332 2333 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2334 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 2335 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 2336 vi->ctrl->promisc ? "en" : "dis"); 2337 2338 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 2339 2340 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2341 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 2342 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 2343 vi->ctrl->allmulti ? "en" : "dis"); 2344 2345 uc_count = netdev_uc_count(dev); 2346 mc_count = netdev_mc_count(dev); 2347 /* MAC filter - use one buffer for both lists */ 2348 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 2349 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 2350 mac_data = buf; 2351 if (!buf) 2352 return; 2353 2354 sg_init_table(sg, 2); 2355 2356 /* Store the unicast list and count in the front of the buffer */ 2357 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 2358 i = 0; 2359 netdev_for_each_uc_addr(ha, dev) 2360 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2361 2362 sg_set_buf(&sg[0], mac_data, 2363 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 2364 2365 /* multicast list and count fill the end */ 2366 mac_data = (void *)&mac_data->macs[uc_count][0]; 2367 2368 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 2369 i = 0; 2370 netdev_for_each_mc_addr(ha, dev) 2371 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2372 2373 sg_set_buf(&sg[1], mac_data, 2374 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 2375 2376 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2377 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 2378 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 2379 2380 kfree(buf); 2381 } 2382 2383 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 2384 __be16 proto, u16 vid) 2385 { 2386 struct virtnet_info *vi = netdev_priv(dev); 2387 struct scatterlist sg; 2388 2389 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2390 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2391 2392 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2393 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 2394 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 2395 return 0; 2396 } 2397 2398 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 2399 __be16 proto, u16 vid) 2400 { 2401 struct virtnet_info *vi = netdev_priv(dev); 2402 struct scatterlist sg; 2403 2404 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2405 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2406 2407 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2408 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 2409 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 2410 return 0; 2411 } 2412 2413 static void virtnet_clean_affinity(struct virtnet_info *vi) 2414 { 2415 int i; 2416 2417 if (vi->affinity_hint_set) { 2418 for (i = 0; i < vi->max_queue_pairs; i++) { 2419 virtqueue_set_affinity(vi->rq[i].vq, NULL); 2420 virtqueue_set_affinity(vi->sq[i].vq, NULL); 2421 } 2422 2423 vi->affinity_hint_set = false; 2424 } 2425 } 2426 2427 static void virtnet_set_affinity(struct virtnet_info *vi) 2428 { 2429 cpumask_var_t mask; 2430 int stragglers; 2431 int group_size; 2432 int i, j, cpu; 2433 int num_cpu; 2434 int stride; 2435 2436 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 2437 virtnet_clean_affinity(vi); 2438 return; 2439 } 2440 2441 num_cpu = num_online_cpus(); 2442 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 2443 stragglers = num_cpu >= vi->curr_queue_pairs ? 2444 num_cpu % vi->curr_queue_pairs : 2445 0; 2446 cpu = cpumask_first(cpu_online_mask); 2447 2448 for (i = 0; i < vi->curr_queue_pairs; i++) { 2449 group_size = stride + (i < stragglers ? 1 : 0); 2450 2451 for (j = 0; j < group_size; j++) { 2452 cpumask_set_cpu(cpu, mask); 2453 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 2454 nr_cpu_ids, false); 2455 } 2456 virtqueue_set_affinity(vi->rq[i].vq, mask); 2457 virtqueue_set_affinity(vi->sq[i].vq, mask); 2458 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS); 2459 cpumask_clear(mask); 2460 } 2461 2462 vi->affinity_hint_set = true; 2463 free_cpumask_var(mask); 2464 } 2465 2466 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 2467 { 2468 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2469 node); 2470 virtnet_set_affinity(vi); 2471 return 0; 2472 } 2473 2474 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 2475 { 2476 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2477 node_dead); 2478 virtnet_set_affinity(vi); 2479 return 0; 2480 } 2481 2482 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 2483 { 2484 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2485 node); 2486 2487 virtnet_clean_affinity(vi); 2488 return 0; 2489 } 2490 2491 static enum cpuhp_state virtionet_online; 2492 2493 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 2494 { 2495 int ret; 2496 2497 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 2498 if (ret) 2499 return ret; 2500 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2501 &vi->node_dead); 2502 if (!ret) 2503 return ret; 2504 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2505 return ret; 2506 } 2507 2508 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 2509 { 2510 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2511 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2512 &vi->node_dead); 2513 } 2514 2515 static void virtnet_get_ringparam(struct net_device *dev, 2516 struct ethtool_ringparam *ring, 2517 struct kernel_ethtool_ringparam *kernel_ring, 2518 struct netlink_ext_ack *extack) 2519 { 2520 struct virtnet_info *vi = netdev_priv(dev); 2521 2522 ring->rx_max_pending = vi->rq[0].vq->num_max; 2523 ring->tx_max_pending = vi->sq[0].vq->num_max; 2524 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2525 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2526 } 2527 2528 static int virtnet_set_ringparam(struct net_device *dev, 2529 struct ethtool_ringparam *ring, 2530 struct kernel_ethtool_ringparam *kernel_ring, 2531 struct netlink_ext_ack *extack) 2532 { 2533 struct virtnet_info *vi = netdev_priv(dev); 2534 u32 rx_pending, tx_pending; 2535 struct receive_queue *rq; 2536 struct send_queue *sq; 2537 int i, err; 2538 2539 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 2540 return -EINVAL; 2541 2542 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2543 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2544 2545 if (ring->rx_pending == rx_pending && 2546 ring->tx_pending == tx_pending) 2547 return 0; 2548 2549 if (ring->rx_pending > vi->rq[0].vq->num_max) 2550 return -EINVAL; 2551 2552 if (ring->tx_pending > vi->sq[0].vq->num_max) 2553 return -EINVAL; 2554 2555 for (i = 0; i < vi->max_queue_pairs; i++) { 2556 rq = vi->rq + i; 2557 sq = vi->sq + i; 2558 2559 if (ring->tx_pending != tx_pending) { 2560 err = virtnet_tx_resize(vi, sq, ring->tx_pending); 2561 if (err) 2562 return err; 2563 } 2564 2565 if (ring->rx_pending != rx_pending) { 2566 err = virtnet_rx_resize(vi, rq, ring->rx_pending); 2567 if (err) 2568 return err; 2569 } 2570 } 2571 2572 return 0; 2573 } 2574 2575 static bool virtnet_commit_rss_command(struct virtnet_info *vi) 2576 { 2577 struct net_device *dev = vi->dev; 2578 struct scatterlist sgs[4]; 2579 unsigned int sg_buf_size; 2580 2581 /* prepare sgs */ 2582 sg_init_table(sgs, 4); 2583 2584 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); 2585 sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); 2586 2587 sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1); 2588 sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); 2589 2590 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) 2591 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); 2592 sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); 2593 2594 sg_buf_size = vi->rss_key_size; 2595 sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size); 2596 2597 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2598 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG 2599 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) { 2600 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); 2601 return false; 2602 } 2603 return true; 2604 } 2605 2606 static void virtnet_init_default_rss(struct virtnet_info *vi) 2607 { 2608 u32 indir_val = 0; 2609 int i = 0; 2610 2611 vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; 2612 vi->rss_hash_types_saved = vi->rss_hash_types_supported; 2613 vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size 2614 ? vi->rss_indir_table_size - 1 : 0; 2615 vi->ctrl->rss.unclassified_queue = 0; 2616 2617 for (; i < vi->rss_indir_table_size; ++i) { 2618 indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); 2619 vi->ctrl->rss.indirection_table[i] = indir_val; 2620 } 2621 2622 vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; 2623 vi->ctrl->rss.hash_key_length = vi->rss_key_size; 2624 2625 netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); 2626 } 2627 2628 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info) 2629 { 2630 info->data = 0; 2631 switch (info->flow_type) { 2632 case TCP_V4_FLOW: 2633 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 2634 info->data = RXH_IP_SRC | RXH_IP_DST | 2635 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2636 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2637 info->data = RXH_IP_SRC | RXH_IP_DST; 2638 } 2639 break; 2640 case TCP_V6_FLOW: 2641 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 2642 info->data = RXH_IP_SRC | RXH_IP_DST | 2643 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2644 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2645 info->data = RXH_IP_SRC | RXH_IP_DST; 2646 } 2647 break; 2648 case UDP_V4_FLOW: 2649 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 2650 info->data = RXH_IP_SRC | RXH_IP_DST | 2651 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2652 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2653 info->data = RXH_IP_SRC | RXH_IP_DST; 2654 } 2655 break; 2656 case UDP_V6_FLOW: 2657 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 2658 info->data = RXH_IP_SRC | RXH_IP_DST | 2659 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2660 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2661 info->data = RXH_IP_SRC | RXH_IP_DST; 2662 } 2663 break; 2664 case IPV4_FLOW: 2665 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) 2666 info->data = RXH_IP_SRC | RXH_IP_DST; 2667 2668 break; 2669 case IPV6_FLOW: 2670 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) 2671 info->data = RXH_IP_SRC | RXH_IP_DST; 2672 2673 break; 2674 default: 2675 info->data = 0; 2676 break; 2677 } 2678 } 2679 2680 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info) 2681 { 2682 u32 new_hashtypes = vi->rss_hash_types_saved; 2683 bool is_disable = info->data & RXH_DISCARD; 2684 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3); 2685 2686 /* supports only 'sd', 'sdfn' and 'r' */ 2687 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable)) 2688 return false; 2689 2690 switch (info->flow_type) { 2691 case TCP_V4_FLOW: 2692 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4); 2693 if (!is_disable) 2694 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2695 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0); 2696 break; 2697 case UDP_V4_FLOW: 2698 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4); 2699 if (!is_disable) 2700 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2701 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0); 2702 break; 2703 case IPV4_FLOW: 2704 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2705 if (!is_disable) 2706 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2707 break; 2708 case TCP_V6_FLOW: 2709 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6); 2710 if (!is_disable) 2711 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2712 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0); 2713 break; 2714 case UDP_V6_FLOW: 2715 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6); 2716 if (!is_disable) 2717 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2718 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0); 2719 break; 2720 case IPV6_FLOW: 2721 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2722 if (!is_disable) 2723 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2724 break; 2725 default: 2726 /* unsupported flow */ 2727 return false; 2728 } 2729 2730 /* if unsupported hashtype was set */ 2731 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported)) 2732 return false; 2733 2734 if (new_hashtypes != vi->rss_hash_types_saved) { 2735 vi->rss_hash_types_saved = new_hashtypes; 2736 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 2737 if (vi->dev->features & NETIF_F_RXHASH) 2738 return virtnet_commit_rss_command(vi); 2739 } 2740 2741 return true; 2742 } 2743 2744 static void virtnet_get_drvinfo(struct net_device *dev, 2745 struct ethtool_drvinfo *info) 2746 { 2747 struct virtnet_info *vi = netdev_priv(dev); 2748 struct virtio_device *vdev = vi->vdev; 2749 2750 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 2751 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 2752 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 2753 2754 } 2755 2756 /* TODO: Eliminate OOO packets during switching */ 2757 static int virtnet_set_channels(struct net_device *dev, 2758 struct ethtool_channels *channels) 2759 { 2760 struct virtnet_info *vi = netdev_priv(dev); 2761 u16 queue_pairs = channels->combined_count; 2762 int err; 2763 2764 /* We don't support separate rx/tx channels. 2765 * We don't allow setting 'other' channels. 2766 */ 2767 if (channels->rx_count || channels->tx_count || channels->other_count) 2768 return -EINVAL; 2769 2770 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2771 return -EINVAL; 2772 2773 /* For now we don't support modifying channels while XDP is loaded 2774 * also when XDP is loaded all RX queues have XDP programs so we only 2775 * need to check a single RX queue. 2776 */ 2777 if (vi->rq[0].xdp_prog) 2778 return -EINVAL; 2779 2780 cpus_read_lock(); 2781 err = _virtnet_set_queues(vi, queue_pairs); 2782 if (err) { 2783 cpus_read_unlock(); 2784 goto err; 2785 } 2786 virtnet_set_affinity(vi); 2787 cpus_read_unlock(); 2788 2789 netif_set_real_num_tx_queues(dev, queue_pairs); 2790 netif_set_real_num_rx_queues(dev, queue_pairs); 2791 err: 2792 return err; 2793 } 2794 2795 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2796 { 2797 struct virtnet_info *vi = netdev_priv(dev); 2798 unsigned int i, j; 2799 u8 *p = data; 2800 2801 switch (stringset) { 2802 case ETH_SS_STATS: 2803 for (i = 0; i < vi->curr_queue_pairs; i++) { 2804 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) 2805 ethtool_sprintf(&p, "rx_queue_%u_%s", i, 2806 virtnet_rq_stats_desc[j].desc); 2807 } 2808 2809 for (i = 0; i < vi->curr_queue_pairs; i++) { 2810 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) 2811 ethtool_sprintf(&p, "tx_queue_%u_%s", i, 2812 virtnet_sq_stats_desc[j].desc); 2813 } 2814 break; 2815 } 2816 } 2817 2818 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2819 { 2820 struct virtnet_info *vi = netdev_priv(dev); 2821 2822 switch (sset) { 2823 case ETH_SS_STATS: 2824 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2825 VIRTNET_SQ_STATS_LEN); 2826 default: 2827 return -EOPNOTSUPP; 2828 } 2829 } 2830 2831 static void virtnet_get_ethtool_stats(struct net_device *dev, 2832 struct ethtool_stats *stats, u64 *data) 2833 { 2834 struct virtnet_info *vi = netdev_priv(dev); 2835 unsigned int idx = 0, start, i, j; 2836 const u8 *stats_base; 2837 size_t offset; 2838 2839 for (i = 0; i < vi->curr_queue_pairs; i++) { 2840 struct receive_queue *rq = &vi->rq[i]; 2841 2842 stats_base = (u8 *)&rq->stats; 2843 do { 2844 start = u64_stats_fetch_begin(&rq->stats.syncp); 2845 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2846 offset = virtnet_rq_stats_desc[j].offset; 2847 data[idx + j] = *(u64 *)(stats_base + offset); 2848 } 2849 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2850 idx += VIRTNET_RQ_STATS_LEN; 2851 } 2852 2853 for (i = 0; i < vi->curr_queue_pairs; i++) { 2854 struct send_queue *sq = &vi->sq[i]; 2855 2856 stats_base = (u8 *)&sq->stats; 2857 do { 2858 start = u64_stats_fetch_begin(&sq->stats.syncp); 2859 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2860 offset = virtnet_sq_stats_desc[j].offset; 2861 data[idx + j] = *(u64 *)(stats_base + offset); 2862 } 2863 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2864 idx += VIRTNET_SQ_STATS_LEN; 2865 } 2866 } 2867 2868 static void virtnet_get_channels(struct net_device *dev, 2869 struct ethtool_channels *channels) 2870 { 2871 struct virtnet_info *vi = netdev_priv(dev); 2872 2873 channels->combined_count = vi->curr_queue_pairs; 2874 channels->max_combined = vi->max_queue_pairs; 2875 channels->max_other = 0; 2876 channels->rx_count = 0; 2877 channels->tx_count = 0; 2878 channels->other_count = 0; 2879 } 2880 2881 static int virtnet_set_link_ksettings(struct net_device *dev, 2882 const struct ethtool_link_ksettings *cmd) 2883 { 2884 struct virtnet_info *vi = netdev_priv(dev); 2885 2886 return ethtool_virtdev_set_link_ksettings(dev, cmd, 2887 &vi->speed, &vi->duplex); 2888 } 2889 2890 static int virtnet_get_link_ksettings(struct net_device *dev, 2891 struct ethtool_link_ksettings *cmd) 2892 { 2893 struct virtnet_info *vi = netdev_priv(dev); 2894 2895 cmd->base.speed = vi->speed; 2896 cmd->base.duplex = vi->duplex; 2897 cmd->base.port = PORT_OTHER; 2898 2899 return 0; 2900 } 2901 2902 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi, 2903 struct ethtool_coalesce *ec) 2904 { 2905 struct scatterlist sgs_tx, sgs_rx; 2906 struct virtio_net_ctrl_coal_tx coal_tx; 2907 struct virtio_net_ctrl_coal_rx coal_rx; 2908 2909 coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs); 2910 coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames); 2911 sg_init_one(&sgs_tx, &coal_tx, sizeof(coal_tx)); 2912 2913 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2914 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET, 2915 &sgs_tx)) 2916 return -EINVAL; 2917 2918 /* Save parameters */ 2919 vi->tx_usecs = ec->tx_coalesce_usecs; 2920 vi->tx_max_packets = ec->tx_max_coalesced_frames; 2921 2922 coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); 2923 coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); 2924 sg_init_one(&sgs_rx, &coal_rx, sizeof(coal_rx)); 2925 2926 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2927 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, 2928 &sgs_rx)) 2929 return -EINVAL; 2930 2931 /* Save parameters */ 2932 vi->rx_usecs = ec->rx_coalesce_usecs; 2933 vi->rx_max_packets = ec->rx_max_coalesced_frames; 2934 2935 return 0; 2936 } 2937 2938 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec) 2939 { 2940 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL 2941 * feature is negotiated. 2942 */ 2943 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs) 2944 return -EOPNOTSUPP; 2945 2946 if (ec->tx_max_coalesced_frames > 1 || 2947 ec->rx_max_coalesced_frames != 1) 2948 return -EINVAL; 2949 2950 return 0; 2951 } 2952 2953 static int virtnet_set_coalesce(struct net_device *dev, 2954 struct ethtool_coalesce *ec, 2955 struct kernel_ethtool_coalesce *kernel_coal, 2956 struct netlink_ext_ack *extack) 2957 { 2958 struct virtnet_info *vi = netdev_priv(dev); 2959 int ret, i, napi_weight; 2960 bool update_napi = false; 2961 2962 /* Can't change NAPI weight if the link is up */ 2963 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 2964 if (napi_weight ^ vi->sq[0].napi.weight) { 2965 if (dev->flags & IFF_UP) 2966 return -EBUSY; 2967 else 2968 update_napi = true; 2969 } 2970 2971 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) 2972 ret = virtnet_send_notf_coal_cmds(vi, ec); 2973 else 2974 ret = virtnet_coal_params_supported(ec); 2975 2976 if (ret) 2977 return ret; 2978 2979 if (update_napi) { 2980 for (i = 0; i < vi->max_queue_pairs; i++) 2981 vi->sq[i].napi.weight = napi_weight; 2982 } 2983 2984 return ret; 2985 } 2986 2987 static int virtnet_get_coalesce(struct net_device *dev, 2988 struct ethtool_coalesce *ec, 2989 struct kernel_ethtool_coalesce *kernel_coal, 2990 struct netlink_ext_ack *extack) 2991 { 2992 struct virtnet_info *vi = netdev_priv(dev); 2993 2994 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 2995 ec->rx_coalesce_usecs = vi->rx_usecs; 2996 ec->tx_coalesce_usecs = vi->tx_usecs; 2997 ec->tx_max_coalesced_frames = vi->tx_max_packets; 2998 ec->rx_max_coalesced_frames = vi->rx_max_packets; 2999 } else { 3000 ec->rx_max_coalesced_frames = 1; 3001 3002 if (vi->sq[0].napi.weight) 3003 ec->tx_max_coalesced_frames = 1; 3004 } 3005 3006 return 0; 3007 } 3008 3009 static void virtnet_init_settings(struct net_device *dev) 3010 { 3011 struct virtnet_info *vi = netdev_priv(dev); 3012 3013 vi->speed = SPEED_UNKNOWN; 3014 vi->duplex = DUPLEX_UNKNOWN; 3015 } 3016 3017 static void virtnet_update_settings(struct virtnet_info *vi) 3018 { 3019 u32 speed; 3020 u8 duplex; 3021 3022 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 3023 return; 3024 3025 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); 3026 3027 if (ethtool_validate_speed(speed)) 3028 vi->speed = speed; 3029 3030 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); 3031 3032 if (ethtool_validate_duplex(duplex)) 3033 vi->duplex = duplex; 3034 } 3035 3036 static u32 virtnet_get_rxfh_key_size(struct net_device *dev) 3037 { 3038 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; 3039 } 3040 3041 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) 3042 { 3043 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; 3044 } 3045 3046 static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) 3047 { 3048 struct virtnet_info *vi = netdev_priv(dev); 3049 int i; 3050 3051 if (indir) { 3052 for (i = 0; i < vi->rss_indir_table_size; ++i) 3053 indir[i] = vi->ctrl->rss.indirection_table[i]; 3054 } 3055 3056 if (key) 3057 memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); 3058 3059 if (hfunc) 3060 *hfunc = ETH_RSS_HASH_TOP; 3061 3062 return 0; 3063 } 3064 3065 static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) 3066 { 3067 struct virtnet_info *vi = netdev_priv(dev); 3068 int i; 3069 3070 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) 3071 return -EOPNOTSUPP; 3072 3073 if (indir) { 3074 for (i = 0; i < vi->rss_indir_table_size; ++i) 3075 vi->ctrl->rss.indirection_table[i] = indir[i]; 3076 } 3077 if (key) 3078 memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); 3079 3080 virtnet_commit_rss_command(vi); 3081 3082 return 0; 3083 } 3084 3085 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) 3086 { 3087 struct virtnet_info *vi = netdev_priv(dev); 3088 int rc = 0; 3089 3090 switch (info->cmd) { 3091 case ETHTOOL_GRXRINGS: 3092 info->data = vi->curr_queue_pairs; 3093 break; 3094 case ETHTOOL_GRXFH: 3095 virtnet_get_hashflow(vi, info); 3096 break; 3097 default: 3098 rc = -EOPNOTSUPP; 3099 } 3100 3101 return rc; 3102 } 3103 3104 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) 3105 { 3106 struct virtnet_info *vi = netdev_priv(dev); 3107 int rc = 0; 3108 3109 switch (info->cmd) { 3110 case ETHTOOL_SRXFH: 3111 if (!virtnet_set_hashflow(vi, info)) 3112 rc = -EINVAL; 3113 3114 break; 3115 default: 3116 rc = -EOPNOTSUPP; 3117 } 3118 3119 return rc; 3120 } 3121 3122 static const struct ethtool_ops virtnet_ethtool_ops = { 3123 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | 3124 ETHTOOL_COALESCE_USECS, 3125 .get_drvinfo = virtnet_get_drvinfo, 3126 .get_link = ethtool_op_get_link, 3127 .get_ringparam = virtnet_get_ringparam, 3128 .set_ringparam = virtnet_set_ringparam, 3129 .get_strings = virtnet_get_strings, 3130 .get_sset_count = virtnet_get_sset_count, 3131 .get_ethtool_stats = virtnet_get_ethtool_stats, 3132 .set_channels = virtnet_set_channels, 3133 .get_channels = virtnet_get_channels, 3134 .get_ts_info = ethtool_op_get_ts_info, 3135 .get_link_ksettings = virtnet_get_link_ksettings, 3136 .set_link_ksettings = virtnet_set_link_ksettings, 3137 .set_coalesce = virtnet_set_coalesce, 3138 .get_coalesce = virtnet_get_coalesce, 3139 .get_rxfh_key_size = virtnet_get_rxfh_key_size, 3140 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, 3141 .get_rxfh = virtnet_get_rxfh, 3142 .set_rxfh = virtnet_set_rxfh, 3143 .get_rxnfc = virtnet_get_rxnfc, 3144 .set_rxnfc = virtnet_set_rxnfc, 3145 }; 3146 3147 static void virtnet_freeze_down(struct virtio_device *vdev) 3148 { 3149 struct virtnet_info *vi = vdev->priv; 3150 3151 /* Make sure no work handler is accessing the device */ 3152 flush_work(&vi->config_work); 3153 3154 netif_tx_lock_bh(vi->dev); 3155 netif_device_detach(vi->dev); 3156 netif_tx_unlock_bh(vi->dev); 3157 if (netif_running(vi->dev)) 3158 virtnet_close(vi->dev); 3159 } 3160 3161 static int init_vqs(struct virtnet_info *vi); 3162 3163 static int virtnet_restore_up(struct virtio_device *vdev) 3164 { 3165 struct virtnet_info *vi = vdev->priv; 3166 int err; 3167 3168 err = init_vqs(vi); 3169 if (err) 3170 return err; 3171 3172 virtio_device_ready(vdev); 3173 3174 enable_delayed_refill(vi); 3175 3176 if (netif_running(vi->dev)) { 3177 err = virtnet_open(vi->dev); 3178 if (err) 3179 return err; 3180 } 3181 3182 netif_tx_lock_bh(vi->dev); 3183 netif_device_attach(vi->dev); 3184 netif_tx_unlock_bh(vi->dev); 3185 return err; 3186 } 3187 3188 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 3189 { 3190 struct scatterlist sg; 3191 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 3192 3193 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 3194 3195 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 3196 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 3197 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); 3198 return -EINVAL; 3199 } 3200 3201 return 0; 3202 } 3203 3204 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 3205 { 3206 u64 offloads = 0; 3207 3208 if (!vi->guest_offloads) 3209 return 0; 3210 3211 return virtnet_set_guest_offloads(vi, offloads); 3212 } 3213 3214 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 3215 { 3216 u64 offloads = vi->guest_offloads; 3217 3218 if (!vi->guest_offloads) 3219 return 0; 3220 3221 return virtnet_set_guest_offloads(vi, offloads); 3222 } 3223 3224 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 3225 struct netlink_ext_ack *extack) 3226 { 3227 unsigned int room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 3228 sizeof(struct skb_shared_info)); 3229 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN; 3230 struct virtnet_info *vi = netdev_priv(dev); 3231 struct bpf_prog *old_prog; 3232 u16 xdp_qp = 0, curr_qp; 3233 int i, err; 3234 3235 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 3236 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3237 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3238 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3239 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3240 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) || 3241 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) || 3242 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) { 3243 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first"); 3244 return -EOPNOTSUPP; 3245 } 3246 3247 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 3248 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 3249 return -EINVAL; 3250 } 3251 3252 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) { 3253 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags"); 3254 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz); 3255 return -EINVAL; 3256 } 3257 3258 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 3259 if (prog) 3260 xdp_qp = nr_cpu_ids; 3261 3262 /* XDP requires extra queues for XDP_TX */ 3263 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 3264 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", 3265 curr_qp + xdp_qp, vi->max_queue_pairs); 3266 xdp_qp = 0; 3267 } 3268 3269 old_prog = rtnl_dereference(vi->rq[0].xdp_prog); 3270 if (!prog && !old_prog) 3271 return 0; 3272 3273 if (prog) 3274 bpf_prog_add(prog, vi->max_queue_pairs - 1); 3275 3276 /* Make sure NAPI is not using any XDP TX queues for RX. */ 3277 if (netif_running(dev)) { 3278 for (i = 0; i < vi->max_queue_pairs; i++) { 3279 napi_disable(&vi->rq[i].napi); 3280 virtnet_napi_tx_disable(&vi->sq[i].napi); 3281 } 3282 } 3283 3284 if (!prog) { 3285 for (i = 0; i < vi->max_queue_pairs; i++) { 3286 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3287 if (i == 0) 3288 virtnet_restore_guest_offloads(vi); 3289 } 3290 synchronize_net(); 3291 } 3292 3293 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 3294 if (err) 3295 goto err; 3296 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 3297 vi->xdp_queue_pairs = xdp_qp; 3298 3299 if (prog) { 3300 vi->xdp_enabled = true; 3301 for (i = 0; i < vi->max_queue_pairs; i++) { 3302 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3303 if (i == 0 && !old_prog) 3304 virtnet_clear_guest_offloads(vi); 3305 } 3306 if (!old_prog) 3307 xdp_features_set_redirect_target(dev, true); 3308 } else { 3309 xdp_features_clear_redirect_target(dev); 3310 vi->xdp_enabled = false; 3311 } 3312 3313 for (i = 0; i < vi->max_queue_pairs; i++) { 3314 if (old_prog) 3315 bpf_prog_put(old_prog); 3316 if (netif_running(dev)) { 3317 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3318 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3319 &vi->sq[i].napi); 3320 } 3321 } 3322 3323 return 0; 3324 3325 err: 3326 if (!prog) { 3327 virtnet_clear_guest_offloads(vi); 3328 for (i = 0; i < vi->max_queue_pairs; i++) 3329 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); 3330 } 3331 3332 if (netif_running(dev)) { 3333 for (i = 0; i < vi->max_queue_pairs; i++) { 3334 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3335 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3336 &vi->sq[i].napi); 3337 } 3338 } 3339 if (prog) 3340 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 3341 return err; 3342 } 3343 3344 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 3345 { 3346 switch (xdp->command) { 3347 case XDP_SETUP_PROG: 3348 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 3349 default: 3350 return -EINVAL; 3351 } 3352 } 3353 3354 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 3355 size_t len) 3356 { 3357 struct virtnet_info *vi = netdev_priv(dev); 3358 int ret; 3359 3360 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 3361 return -EOPNOTSUPP; 3362 3363 ret = snprintf(buf, len, "sby"); 3364 if (ret >= len) 3365 return -EOPNOTSUPP; 3366 3367 return 0; 3368 } 3369 3370 static int virtnet_set_features(struct net_device *dev, 3371 netdev_features_t features) 3372 { 3373 struct virtnet_info *vi = netdev_priv(dev); 3374 u64 offloads; 3375 int err; 3376 3377 if ((dev->features ^ features) & NETIF_F_GRO_HW) { 3378 if (vi->xdp_enabled) 3379 return -EBUSY; 3380 3381 if (features & NETIF_F_GRO_HW) 3382 offloads = vi->guest_offloads_capable; 3383 else 3384 offloads = vi->guest_offloads_capable & 3385 ~GUEST_OFFLOAD_GRO_HW_MASK; 3386 3387 err = virtnet_set_guest_offloads(vi, offloads); 3388 if (err) 3389 return err; 3390 vi->guest_offloads = offloads; 3391 } 3392 3393 if ((dev->features ^ features) & NETIF_F_RXHASH) { 3394 if (features & NETIF_F_RXHASH) 3395 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 3396 else 3397 vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; 3398 3399 if (!virtnet_commit_rss_command(vi)) 3400 return -EINVAL; 3401 } 3402 3403 return 0; 3404 } 3405 3406 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue) 3407 { 3408 struct virtnet_info *priv = netdev_priv(dev); 3409 struct send_queue *sq = &priv->sq[txqueue]; 3410 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue); 3411 3412 u64_stats_update_begin(&sq->stats.syncp); 3413 sq->stats.tx_timeouts++; 3414 u64_stats_update_end(&sq->stats.syncp); 3415 3416 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n", 3417 txqueue, sq->name, sq->vq->index, sq->vq->name, 3418 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start))); 3419 } 3420 3421 static const struct net_device_ops virtnet_netdev = { 3422 .ndo_open = virtnet_open, 3423 .ndo_stop = virtnet_close, 3424 .ndo_start_xmit = start_xmit, 3425 .ndo_validate_addr = eth_validate_addr, 3426 .ndo_set_mac_address = virtnet_set_mac_address, 3427 .ndo_set_rx_mode = virtnet_set_rx_mode, 3428 .ndo_get_stats64 = virtnet_stats, 3429 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 3430 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 3431 .ndo_bpf = virtnet_xdp, 3432 .ndo_xdp_xmit = virtnet_xdp_xmit, 3433 .ndo_features_check = passthru_features_check, 3434 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 3435 .ndo_set_features = virtnet_set_features, 3436 .ndo_tx_timeout = virtnet_tx_timeout, 3437 }; 3438 3439 static void virtnet_config_changed_work(struct work_struct *work) 3440 { 3441 struct virtnet_info *vi = 3442 container_of(work, struct virtnet_info, config_work); 3443 u16 v; 3444 3445 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 3446 struct virtio_net_config, status, &v) < 0) 3447 return; 3448 3449 if (v & VIRTIO_NET_S_ANNOUNCE) { 3450 netdev_notify_peers(vi->dev); 3451 virtnet_ack_link_announce(vi); 3452 } 3453 3454 /* Ignore unknown (future) status bits */ 3455 v &= VIRTIO_NET_S_LINK_UP; 3456 3457 if (vi->status == v) 3458 return; 3459 3460 vi->status = v; 3461 3462 if (vi->status & VIRTIO_NET_S_LINK_UP) { 3463 virtnet_update_settings(vi); 3464 netif_carrier_on(vi->dev); 3465 netif_tx_wake_all_queues(vi->dev); 3466 } else { 3467 netif_carrier_off(vi->dev); 3468 netif_tx_stop_all_queues(vi->dev); 3469 } 3470 } 3471 3472 static void virtnet_config_changed(struct virtio_device *vdev) 3473 { 3474 struct virtnet_info *vi = vdev->priv; 3475 3476 schedule_work(&vi->config_work); 3477 } 3478 3479 static void virtnet_free_queues(struct virtnet_info *vi) 3480 { 3481 int i; 3482 3483 for (i = 0; i < vi->max_queue_pairs; i++) { 3484 __netif_napi_del(&vi->rq[i].napi); 3485 __netif_napi_del(&vi->sq[i].napi); 3486 } 3487 3488 /* We called __netif_napi_del(), 3489 * we need to respect an RCU grace period before freeing vi->rq 3490 */ 3491 synchronize_net(); 3492 3493 kfree(vi->rq); 3494 kfree(vi->sq); 3495 kfree(vi->ctrl); 3496 } 3497 3498 static void _free_receive_bufs(struct virtnet_info *vi) 3499 { 3500 struct bpf_prog *old_prog; 3501 int i; 3502 3503 for (i = 0; i < vi->max_queue_pairs; i++) { 3504 while (vi->rq[i].pages) 3505 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 3506 3507 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 3508 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 3509 if (old_prog) 3510 bpf_prog_put(old_prog); 3511 } 3512 } 3513 3514 static void free_receive_bufs(struct virtnet_info *vi) 3515 { 3516 rtnl_lock(); 3517 _free_receive_bufs(vi); 3518 rtnl_unlock(); 3519 } 3520 3521 static void free_receive_page_frags(struct virtnet_info *vi) 3522 { 3523 int i; 3524 for (i = 0; i < vi->max_queue_pairs; i++) 3525 if (vi->rq[i].alloc_frag.page) 3526 put_page(vi->rq[i].alloc_frag.page); 3527 } 3528 3529 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) 3530 { 3531 if (!is_xdp_frame(buf)) 3532 dev_kfree_skb(buf); 3533 else 3534 xdp_return_frame(ptr_to_xdp(buf)); 3535 } 3536 3537 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf) 3538 { 3539 struct virtnet_info *vi = vq->vdev->priv; 3540 int i = vq2rxq(vq); 3541 3542 if (vi->mergeable_rx_bufs) 3543 put_page(virt_to_head_page(buf)); 3544 else if (vi->big_packets) 3545 give_pages(&vi->rq[i], buf); 3546 else 3547 put_page(virt_to_head_page(buf)); 3548 } 3549 3550 static void free_unused_bufs(struct virtnet_info *vi) 3551 { 3552 void *buf; 3553 int i; 3554 3555 for (i = 0; i < vi->max_queue_pairs; i++) { 3556 struct virtqueue *vq = vi->sq[i].vq; 3557 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3558 virtnet_sq_free_unused_buf(vq, buf); 3559 } 3560 3561 for (i = 0; i < vi->max_queue_pairs; i++) { 3562 struct virtqueue *vq = vi->rq[i].vq; 3563 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3564 virtnet_rq_free_unused_buf(vq, buf); 3565 } 3566 } 3567 3568 static void virtnet_del_vqs(struct virtnet_info *vi) 3569 { 3570 struct virtio_device *vdev = vi->vdev; 3571 3572 virtnet_clean_affinity(vi); 3573 3574 vdev->config->del_vqs(vdev); 3575 3576 virtnet_free_queues(vi); 3577 } 3578 3579 /* How large should a single buffer be so a queue full of these can fit at 3580 * least one full packet? 3581 * Logic below assumes the mergeable buffer header is used. 3582 */ 3583 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 3584 { 3585 const unsigned int hdr_len = vi->hdr_len; 3586 unsigned int rq_size = virtqueue_get_vring_size(vq); 3587 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 3588 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 3589 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 3590 3591 return max(max(min_buf_len, hdr_len) - hdr_len, 3592 (unsigned int)GOOD_PACKET_LEN); 3593 } 3594 3595 static int virtnet_find_vqs(struct virtnet_info *vi) 3596 { 3597 vq_callback_t **callbacks; 3598 struct virtqueue **vqs; 3599 int ret = -ENOMEM; 3600 int i, total_vqs; 3601 const char **names; 3602 bool *ctx; 3603 3604 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 3605 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 3606 * possible control vq. 3607 */ 3608 total_vqs = vi->max_queue_pairs * 2 + 3609 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 3610 3611 /* Allocate space for find_vqs parameters */ 3612 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 3613 if (!vqs) 3614 goto err_vq; 3615 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 3616 if (!callbacks) 3617 goto err_callback; 3618 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 3619 if (!names) 3620 goto err_names; 3621 if (!vi->big_packets || vi->mergeable_rx_bufs) { 3622 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 3623 if (!ctx) 3624 goto err_ctx; 3625 } else { 3626 ctx = NULL; 3627 } 3628 3629 /* Parameters for control virtqueue, if any */ 3630 if (vi->has_cvq) { 3631 callbacks[total_vqs - 1] = NULL; 3632 names[total_vqs - 1] = "control"; 3633 } 3634 3635 /* Allocate/initialize parameters for send/receive virtqueues */ 3636 for (i = 0; i < vi->max_queue_pairs; i++) { 3637 callbacks[rxq2vq(i)] = skb_recv_done; 3638 callbacks[txq2vq(i)] = skb_xmit_done; 3639 sprintf(vi->rq[i].name, "input.%d", i); 3640 sprintf(vi->sq[i].name, "output.%d", i); 3641 names[rxq2vq(i)] = vi->rq[i].name; 3642 names[txq2vq(i)] = vi->sq[i].name; 3643 if (ctx) 3644 ctx[rxq2vq(i)] = true; 3645 } 3646 3647 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, 3648 names, ctx, NULL); 3649 if (ret) 3650 goto err_find; 3651 3652 if (vi->has_cvq) { 3653 vi->cvq = vqs[total_vqs - 1]; 3654 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 3655 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 3656 } 3657 3658 for (i = 0; i < vi->max_queue_pairs; i++) { 3659 vi->rq[i].vq = vqs[rxq2vq(i)]; 3660 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 3661 vi->sq[i].vq = vqs[txq2vq(i)]; 3662 } 3663 3664 /* run here: ret == 0. */ 3665 3666 3667 err_find: 3668 kfree(ctx); 3669 err_ctx: 3670 kfree(names); 3671 err_names: 3672 kfree(callbacks); 3673 err_callback: 3674 kfree(vqs); 3675 err_vq: 3676 return ret; 3677 } 3678 3679 static int virtnet_alloc_queues(struct virtnet_info *vi) 3680 { 3681 int i; 3682 3683 if (vi->has_cvq) { 3684 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 3685 if (!vi->ctrl) 3686 goto err_ctrl; 3687 } else { 3688 vi->ctrl = NULL; 3689 } 3690 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 3691 if (!vi->sq) 3692 goto err_sq; 3693 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 3694 if (!vi->rq) 3695 goto err_rq; 3696 3697 INIT_DELAYED_WORK(&vi->refill, refill_work); 3698 for (i = 0; i < vi->max_queue_pairs; i++) { 3699 vi->rq[i].pages = NULL; 3700 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll, 3701 napi_weight); 3702 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi, 3703 virtnet_poll_tx, 3704 napi_tx ? napi_weight : 0); 3705 3706 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 3707 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 3708 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 3709 3710 u64_stats_init(&vi->rq[i].stats.syncp); 3711 u64_stats_init(&vi->sq[i].stats.syncp); 3712 } 3713 3714 return 0; 3715 3716 err_rq: 3717 kfree(vi->sq); 3718 err_sq: 3719 kfree(vi->ctrl); 3720 err_ctrl: 3721 return -ENOMEM; 3722 } 3723 3724 static int init_vqs(struct virtnet_info *vi) 3725 { 3726 int ret; 3727 3728 /* Allocate send & receive queues */ 3729 ret = virtnet_alloc_queues(vi); 3730 if (ret) 3731 goto err; 3732 3733 ret = virtnet_find_vqs(vi); 3734 if (ret) 3735 goto err_free; 3736 3737 cpus_read_lock(); 3738 virtnet_set_affinity(vi); 3739 cpus_read_unlock(); 3740 3741 return 0; 3742 3743 err_free: 3744 virtnet_free_queues(vi); 3745 err: 3746 return ret; 3747 } 3748 3749 #ifdef CONFIG_SYSFS 3750 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 3751 char *buf) 3752 { 3753 struct virtnet_info *vi = netdev_priv(queue->dev); 3754 unsigned int queue_index = get_netdev_rx_queue_index(queue); 3755 unsigned int headroom = virtnet_get_headroom(vi); 3756 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 3757 struct ewma_pkt_len *avg; 3758 3759 BUG_ON(queue_index >= vi->max_queue_pairs); 3760 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 3761 return sprintf(buf, "%u\n", 3762 get_mergeable_buf_len(&vi->rq[queue_index], avg, 3763 SKB_DATA_ALIGN(headroom + tailroom))); 3764 } 3765 3766 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 3767 __ATTR_RO(mergeable_rx_buffer_size); 3768 3769 static struct attribute *virtio_net_mrg_rx_attrs[] = { 3770 &mergeable_rx_buffer_size_attribute.attr, 3771 NULL 3772 }; 3773 3774 static const struct attribute_group virtio_net_mrg_rx_group = { 3775 .name = "virtio_net", 3776 .attrs = virtio_net_mrg_rx_attrs 3777 }; 3778 #endif 3779 3780 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 3781 unsigned int fbit, 3782 const char *fname, const char *dname) 3783 { 3784 if (!virtio_has_feature(vdev, fbit)) 3785 return false; 3786 3787 dev_err(&vdev->dev, "device advertises feature %s but not %s", 3788 fname, dname); 3789 3790 return true; 3791 } 3792 3793 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 3794 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 3795 3796 static bool virtnet_validate_features(struct virtio_device *vdev) 3797 { 3798 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 3799 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 3800 "VIRTIO_NET_F_CTRL_VQ") || 3801 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 3802 "VIRTIO_NET_F_CTRL_VQ") || 3803 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 3804 "VIRTIO_NET_F_CTRL_VQ") || 3805 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 3806 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 3807 "VIRTIO_NET_F_CTRL_VQ") || 3808 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, 3809 "VIRTIO_NET_F_CTRL_VQ") || 3810 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT, 3811 "VIRTIO_NET_F_CTRL_VQ") || 3812 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL, 3813 "VIRTIO_NET_F_CTRL_VQ"))) { 3814 return false; 3815 } 3816 3817 return true; 3818 } 3819 3820 #define MIN_MTU ETH_MIN_MTU 3821 #define MAX_MTU ETH_MAX_MTU 3822 3823 static int virtnet_validate(struct virtio_device *vdev) 3824 { 3825 if (!vdev->config->get) { 3826 dev_err(&vdev->dev, "%s failure: config access disabled\n", 3827 __func__); 3828 return -EINVAL; 3829 } 3830 3831 if (!virtnet_validate_features(vdev)) 3832 return -EINVAL; 3833 3834 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3835 int mtu = virtio_cread16(vdev, 3836 offsetof(struct virtio_net_config, 3837 mtu)); 3838 if (mtu < MIN_MTU) 3839 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 3840 } 3841 3842 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) && 3843 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3844 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby"); 3845 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY); 3846 } 3847 3848 return 0; 3849 } 3850 3851 static bool virtnet_check_guest_gso(const struct virtnet_info *vi) 3852 { 3853 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3854 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3855 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3856 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3857 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) && 3858 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6)); 3859 } 3860 3861 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu) 3862 { 3863 bool guest_gso = virtnet_check_guest_gso(vi); 3864 3865 /* If device can receive ANY guest GSO packets, regardless of mtu, 3866 * allocate packets of maximum size, otherwise limit it to only 3867 * mtu size worth only. 3868 */ 3869 if (mtu > ETH_DATA_LEN || guest_gso) { 3870 vi->big_packets = true; 3871 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE); 3872 } 3873 } 3874 3875 static int virtnet_probe(struct virtio_device *vdev) 3876 { 3877 int i, err = -ENOMEM; 3878 struct net_device *dev; 3879 struct virtnet_info *vi; 3880 u16 max_queue_pairs; 3881 int mtu = 0; 3882 3883 /* Find if host supports multiqueue/rss virtio_net device */ 3884 max_queue_pairs = 1; 3885 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 3886 max_queue_pairs = 3887 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs)); 3888 3889 /* We need at least 2 queue's */ 3890 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 3891 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 3892 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 3893 max_queue_pairs = 1; 3894 3895 /* Allocate ourselves a network device with room for our info */ 3896 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 3897 if (!dev) 3898 return -ENOMEM; 3899 3900 /* Set up network device as normal. */ 3901 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE | 3902 IFF_TX_SKB_NO_LINEAR; 3903 dev->netdev_ops = &virtnet_netdev; 3904 dev->features = NETIF_F_HIGHDMA; 3905 3906 dev->ethtool_ops = &virtnet_ethtool_ops; 3907 SET_NETDEV_DEV(dev, &vdev->dev); 3908 3909 /* Do we support "hardware" checksums? */ 3910 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 3911 /* This opens up the world of extra features. */ 3912 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3913 if (csum) 3914 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3915 3916 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 3917 dev->hw_features |= NETIF_F_TSO 3918 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 3919 } 3920 /* Individual feature bits: what can host handle? */ 3921 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 3922 dev->hw_features |= NETIF_F_TSO; 3923 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 3924 dev->hw_features |= NETIF_F_TSO6; 3925 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 3926 dev->hw_features |= NETIF_F_TSO_ECN; 3927 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO)) 3928 dev->hw_features |= NETIF_F_GSO_UDP_L4; 3929 3930 dev->features |= NETIF_F_GSO_ROBUST; 3931 3932 if (gso) 3933 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 3934 /* (!csum && gso) case will be fixed by register_netdev() */ 3935 } 3936 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 3937 dev->features |= NETIF_F_RXCSUM; 3938 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3939 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 3940 dev->features |= NETIF_F_GRO_HW; 3941 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 3942 dev->hw_features |= NETIF_F_GRO_HW; 3943 3944 dev->vlan_features = dev->features; 3945 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT; 3946 3947 /* MTU range: 68 - 65535 */ 3948 dev->min_mtu = MIN_MTU; 3949 dev->max_mtu = MAX_MTU; 3950 3951 /* Configuration may specify what MAC to use. Otherwise random. */ 3952 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3953 u8 addr[ETH_ALEN]; 3954 3955 virtio_cread_bytes(vdev, 3956 offsetof(struct virtio_net_config, mac), 3957 addr, ETH_ALEN); 3958 eth_hw_addr_set(dev, addr); 3959 } else { 3960 eth_hw_addr_random(dev); 3961 dev_info(&vdev->dev, "Assigned random MAC address %pM\n", 3962 dev->dev_addr); 3963 } 3964 3965 /* Set up our device-specific information */ 3966 vi = netdev_priv(dev); 3967 vi->dev = dev; 3968 vi->vdev = vdev; 3969 vdev->priv = vi; 3970 3971 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 3972 spin_lock_init(&vi->refill_lock); 3973 3974 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { 3975 vi->mergeable_rx_bufs = true; 3976 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG; 3977 } 3978 3979 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 3980 vi->rx_usecs = 0; 3981 vi->tx_usecs = 0; 3982 vi->tx_max_packets = 0; 3983 vi->rx_max_packets = 0; 3984 } 3985 3986 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) 3987 vi->has_rss_hash_report = true; 3988 3989 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 3990 vi->has_rss = true; 3991 3992 if (vi->has_rss || vi->has_rss_hash_report) { 3993 vi->rss_indir_table_size = 3994 virtio_cread16(vdev, offsetof(struct virtio_net_config, 3995 rss_max_indirection_table_length)); 3996 vi->rss_key_size = 3997 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); 3998 3999 vi->rss_hash_types_supported = 4000 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); 4001 vi->rss_hash_types_supported &= 4002 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | 4003 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | 4004 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); 4005 4006 dev->hw_features |= NETIF_F_RXHASH; 4007 } 4008 4009 if (vi->has_rss_hash_report) 4010 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash); 4011 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 4012 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4013 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 4014 else 4015 vi->hdr_len = sizeof(struct virtio_net_hdr); 4016 4017 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 4018 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4019 vi->any_header_sg = true; 4020 4021 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 4022 vi->has_cvq = true; 4023 4024 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 4025 mtu = virtio_cread16(vdev, 4026 offsetof(struct virtio_net_config, 4027 mtu)); 4028 if (mtu < dev->min_mtu) { 4029 /* Should never trigger: MTU was previously validated 4030 * in virtnet_validate. 4031 */ 4032 dev_err(&vdev->dev, 4033 "device MTU appears to have changed it is now %d < %d", 4034 mtu, dev->min_mtu); 4035 err = -EINVAL; 4036 goto free; 4037 } 4038 4039 dev->mtu = mtu; 4040 dev->max_mtu = mtu; 4041 } 4042 4043 virtnet_set_big_packets(vi, mtu); 4044 4045 if (vi->any_header_sg) 4046 dev->needed_headroom = vi->hdr_len; 4047 4048 /* Enable multiqueue by default */ 4049 if (num_online_cpus() >= max_queue_pairs) 4050 vi->curr_queue_pairs = max_queue_pairs; 4051 else 4052 vi->curr_queue_pairs = num_online_cpus(); 4053 vi->max_queue_pairs = max_queue_pairs; 4054 4055 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 4056 err = init_vqs(vi); 4057 if (err) 4058 goto free; 4059 4060 #ifdef CONFIG_SYSFS 4061 if (vi->mergeable_rx_bufs) 4062 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 4063 #endif 4064 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 4065 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 4066 4067 virtnet_init_settings(dev); 4068 4069 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 4070 vi->failover = net_failover_create(vi->dev); 4071 if (IS_ERR(vi->failover)) { 4072 err = PTR_ERR(vi->failover); 4073 goto free_vqs; 4074 } 4075 } 4076 4077 if (vi->has_rss || vi->has_rss_hash_report) 4078 virtnet_init_default_rss(vi); 4079 4080 /* serialize netdev register + virtio_device_ready() with ndo_open() */ 4081 rtnl_lock(); 4082 4083 err = register_netdevice(dev); 4084 if (err) { 4085 pr_debug("virtio_net: registering device failed\n"); 4086 rtnl_unlock(); 4087 goto free_failover; 4088 } 4089 4090 virtio_device_ready(vdev); 4091 4092 /* a random MAC address has been assigned, notify the device. 4093 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there 4094 * because many devices work fine without getting MAC explicitly 4095 */ 4096 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 4097 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 4098 struct scatterlist sg; 4099 4100 sg_init_one(&sg, dev->dev_addr, dev->addr_len); 4101 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 4102 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 4103 pr_debug("virtio_net: setting MAC address failed\n"); 4104 rtnl_unlock(); 4105 err = -EINVAL; 4106 goto free_unregister_netdev; 4107 } 4108 } 4109 4110 rtnl_unlock(); 4111 4112 err = virtnet_cpu_notif_add(vi); 4113 if (err) { 4114 pr_debug("virtio_net: registering cpu notifier failed\n"); 4115 goto free_unregister_netdev; 4116 } 4117 4118 virtnet_set_queues(vi, vi->curr_queue_pairs); 4119 4120 /* Assume link up if device can't report link status, 4121 otherwise get link status from config. */ 4122 netif_carrier_off(dev); 4123 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 4124 schedule_work(&vi->config_work); 4125 } else { 4126 vi->status = VIRTIO_NET_S_LINK_UP; 4127 virtnet_update_settings(vi); 4128 netif_carrier_on(dev); 4129 } 4130 4131 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 4132 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 4133 set_bit(guest_offloads[i], &vi->guest_offloads); 4134 vi->guest_offloads_capable = vi->guest_offloads; 4135 4136 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 4137 dev->name, max_queue_pairs); 4138 4139 return 0; 4140 4141 free_unregister_netdev: 4142 unregister_netdev(dev); 4143 free_failover: 4144 net_failover_destroy(vi->failover); 4145 free_vqs: 4146 virtio_reset_device(vdev); 4147 cancel_delayed_work_sync(&vi->refill); 4148 free_receive_page_frags(vi); 4149 virtnet_del_vqs(vi); 4150 free: 4151 free_netdev(dev); 4152 return err; 4153 } 4154 4155 static void remove_vq_common(struct virtnet_info *vi) 4156 { 4157 virtio_reset_device(vi->vdev); 4158 4159 /* Free unused buffers in both send and recv, if any. */ 4160 free_unused_bufs(vi); 4161 4162 free_receive_bufs(vi); 4163 4164 free_receive_page_frags(vi); 4165 4166 virtnet_del_vqs(vi); 4167 } 4168 4169 static void virtnet_remove(struct virtio_device *vdev) 4170 { 4171 struct virtnet_info *vi = vdev->priv; 4172 4173 virtnet_cpu_notif_remove(vi); 4174 4175 /* Make sure no work handler is accessing the device. */ 4176 flush_work(&vi->config_work); 4177 4178 unregister_netdev(vi->dev); 4179 4180 net_failover_destroy(vi->failover); 4181 4182 remove_vq_common(vi); 4183 4184 free_netdev(vi->dev); 4185 } 4186 4187 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 4188 { 4189 struct virtnet_info *vi = vdev->priv; 4190 4191 virtnet_cpu_notif_remove(vi); 4192 virtnet_freeze_down(vdev); 4193 remove_vq_common(vi); 4194 4195 return 0; 4196 } 4197 4198 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 4199 { 4200 struct virtnet_info *vi = vdev->priv; 4201 int err; 4202 4203 err = virtnet_restore_up(vdev); 4204 if (err) 4205 return err; 4206 virtnet_set_queues(vi, vi->curr_queue_pairs); 4207 4208 err = virtnet_cpu_notif_add(vi); 4209 if (err) { 4210 virtnet_freeze_down(vdev); 4211 remove_vq_common(vi); 4212 return err; 4213 } 4214 4215 return 0; 4216 } 4217 4218 static struct virtio_device_id id_table[] = { 4219 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 4220 { 0 }, 4221 }; 4222 4223 #define VIRTNET_FEATURES \ 4224 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 4225 VIRTIO_NET_F_MAC, \ 4226 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 4227 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 4228 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 4229 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \ 4230 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 4231 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 4232 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 4233 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 4234 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 4235 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \ 4236 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \ 4237 VIRTIO_NET_F_GUEST_HDRLEN 4238 4239 static unsigned int features[] = { 4240 VIRTNET_FEATURES, 4241 }; 4242 4243 static unsigned int features_legacy[] = { 4244 VIRTNET_FEATURES, 4245 VIRTIO_NET_F_GSO, 4246 VIRTIO_F_ANY_LAYOUT, 4247 }; 4248 4249 static struct virtio_driver virtio_net_driver = { 4250 .feature_table = features, 4251 .feature_table_size = ARRAY_SIZE(features), 4252 .feature_table_legacy = features_legacy, 4253 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 4254 .driver.name = KBUILD_MODNAME, 4255 .driver.owner = THIS_MODULE, 4256 .id_table = id_table, 4257 .validate = virtnet_validate, 4258 .probe = virtnet_probe, 4259 .remove = virtnet_remove, 4260 .config_changed = virtnet_config_changed, 4261 #ifdef CONFIG_PM_SLEEP 4262 .freeze = virtnet_freeze, 4263 .restore = virtnet_restore, 4264 #endif 4265 }; 4266 4267 static __init int virtio_net_driver_init(void) 4268 { 4269 int ret; 4270 4271 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 4272 virtnet_cpu_online, 4273 virtnet_cpu_down_prep); 4274 if (ret < 0) 4275 goto out; 4276 virtionet_online = ret; 4277 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 4278 NULL, virtnet_cpu_dead); 4279 if (ret) 4280 goto err_dead; 4281 ret = register_virtio_driver(&virtio_net_driver); 4282 if (ret) 4283 goto err_virtio; 4284 return 0; 4285 err_virtio: 4286 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4287 err_dead: 4288 cpuhp_remove_multi_state(virtionet_online); 4289 out: 4290 return ret; 4291 } 4292 module_init(virtio_net_driver_init); 4293 4294 static __exit void virtio_net_driver_exit(void) 4295 { 4296 unregister_virtio_driver(&virtio_net_driver); 4297 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4298 cpuhp_remove_multi_state(virtionet_online); 4299 } 4300 module_exit(virtio_net_driver_exit); 4301 4302 MODULE_DEVICE_TABLE(virtio, id_table); 4303 MODULE_DESCRIPTION("Virtio network driver"); 4304 MODULE_LICENSE("GPL"); 4305