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 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 819 struct page *page; 820 821 if (page_off + *len + tailroom > PAGE_SIZE) 822 return NULL; 823 824 page = alloc_page(GFP_ATOMIC); 825 if (!page) 826 return NULL; 827 828 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 829 page_off += *len; 830 831 while (--*num_buf) { 832 unsigned int buflen; 833 void *buf; 834 int off; 835 836 buf = virtqueue_get_buf(rq->vq, &buflen); 837 if (unlikely(!buf)) 838 goto err_buf; 839 840 p = virt_to_head_page(buf); 841 off = buf - page_address(p); 842 843 /* guard against a misconfigured or uncooperative backend that 844 * is sending packet larger than the MTU. 845 */ 846 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 847 put_page(p); 848 goto err_buf; 849 } 850 851 memcpy(page_address(page) + page_off, 852 page_address(p) + off, buflen); 853 page_off += buflen; 854 put_page(p); 855 } 856 857 /* Headroom does not contribute to packet length */ 858 *len = page_off - VIRTIO_XDP_HEADROOM; 859 return page; 860 err_buf: 861 __free_pages(page, 0); 862 return NULL; 863 } 864 865 static struct sk_buff *receive_small(struct net_device *dev, 866 struct virtnet_info *vi, 867 struct receive_queue *rq, 868 void *buf, void *ctx, 869 unsigned int len, 870 unsigned int *xdp_xmit, 871 struct virtnet_rq_stats *stats) 872 { 873 struct sk_buff *skb; 874 struct bpf_prog *xdp_prog; 875 unsigned int xdp_headroom = (unsigned long)ctx; 876 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 877 unsigned int headroom = vi->hdr_len + header_offset; 878 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 879 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 880 struct page *page = virt_to_head_page(buf); 881 unsigned int delta = 0; 882 struct page *xdp_page; 883 int err; 884 unsigned int metasize = 0; 885 886 len -= vi->hdr_len; 887 stats->bytes += len; 888 889 if (unlikely(len > GOOD_PACKET_LEN)) { 890 pr_debug("%s: rx error: len %u exceeds max size %d\n", 891 dev->name, len, GOOD_PACKET_LEN); 892 dev->stats.rx_length_errors++; 893 goto err; 894 } 895 896 if (likely(!vi->xdp_enabled)) { 897 xdp_prog = NULL; 898 goto skip_xdp; 899 } 900 901 rcu_read_lock(); 902 xdp_prog = rcu_dereference(rq->xdp_prog); 903 if (xdp_prog) { 904 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 905 struct xdp_frame *xdpf; 906 struct xdp_buff xdp; 907 void *orig_data; 908 u32 act; 909 910 if (unlikely(hdr->hdr.gso_type)) 911 goto err_xdp; 912 913 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 914 int offset = buf - page_address(page) + header_offset; 915 unsigned int tlen = len + vi->hdr_len; 916 int num_buf = 1; 917 918 xdp_headroom = virtnet_get_headroom(vi); 919 header_offset = VIRTNET_RX_PAD + xdp_headroom; 920 headroom = vi->hdr_len + header_offset; 921 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 922 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 923 xdp_page = xdp_linearize_page(rq, &num_buf, page, 924 offset, header_offset, 925 &tlen); 926 if (!xdp_page) 927 goto err_xdp; 928 929 buf = page_address(xdp_page); 930 put_page(page); 931 page = xdp_page; 932 } 933 934 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); 935 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, 936 xdp_headroom, len, true); 937 orig_data = xdp.data; 938 act = bpf_prog_run_xdp(xdp_prog, &xdp); 939 stats->xdp_packets++; 940 941 switch (act) { 942 case XDP_PASS: 943 /* Recalculate length in case bpf program changed it */ 944 delta = orig_data - xdp.data; 945 len = xdp.data_end - xdp.data; 946 metasize = xdp.data - xdp.data_meta; 947 break; 948 case XDP_TX: 949 stats->xdp_tx++; 950 xdpf = xdp_convert_buff_to_frame(&xdp); 951 if (unlikely(!xdpf)) 952 goto err_xdp; 953 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 954 if (unlikely(!err)) { 955 xdp_return_frame_rx_napi(xdpf); 956 } else if (unlikely(err < 0)) { 957 trace_xdp_exception(vi->dev, xdp_prog, act); 958 goto err_xdp; 959 } 960 *xdp_xmit |= VIRTIO_XDP_TX; 961 rcu_read_unlock(); 962 goto xdp_xmit; 963 case XDP_REDIRECT: 964 stats->xdp_redirects++; 965 err = xdp_do_redirect(dev, &xdp, xdp_prog); 966 if (err) 967 goto err_xdp; 968 *xdp_xmit |= VIRTIO_XDP_REDIR; 969 rcu_read_unlock(); 970 goto xdp_xmit; 971 default: 972 bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); 973 fallthrough; 974 case XDP_ABORTED: 975 trace_xdp_exception(vi->dev, xdp_prog, act); 976 goto err_xdp; 977 case XDP_DROP: 978 goto err_xdp; 979 } 980 } 981 rcu_read_unlock(); 982 983 skip_xdp: 984 skb = build_skb(buf, buflen); 985 if (!skb) 986 goto err; 987 skb_reserve(skb, headroom - delta); 988 skb_put(skb, len); 989 if (!xdp_prog) { 990 buf += header_offset; 991 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 992 } /* keep zeroed vnet hdr since XDP is loaded */ 993 994 if (metasize) 995 skb_metadata_set(skb, metasize); 996 997 return skb; 998 999 err_xdp: 1000 rcu_read_unlock(); 1001 stats->xdp_drops++; 1002 err: 1003 stats->drops++; 1004 put_page(page); 1005 xdp_xmit: 1006 return NULL; 1007 } 1008 1009 static struct sk_buff *receive_big(struct net_device *dev, 1010 struct virtnet_info *vi, 1011 struct receive_queue *rq, 1012 void *buf, 1013 unsigned int len, 1014 struct virtnet_rq_stats *stats) 1015 { 1016 struct page *page = buf; 1017 struct sk_buff *skb = 1018 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0); 1019 1020 stats->bytes += len - vi->hdr_len; 1021 if (unlikely(!skb)) 1022 goto err; 1023 1024 return skb; 1025 1026 err: 1027 stats->drops++; 1028 give_pages(rq, page); 1029 return NULL; 1030 } 1031 1032 /* Why not use xdp_build_skb_from_frame() ? 1033 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in 1034 * virtio-net there are 2 points that do not match its requirements: 1035 * 1. The size of the prefilled buffer is not fixed before xdp is set. 1036 * 2. xdp_build_skb_from_frame() does more checks that we don't need, 1037 * like eth_type_trans() (which virtio-net does in receive_buf()). 1038 */ 1039 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev, 1040 struct virtnet_info *vi, 1041 struct xdp_buff *xdp, 1042 unsigned int xdp_frags_truesz) 1043 { 1044 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 1045 unsigned int headroom, data_len; 1046 struct sk_buff *skb; 1047 int metasize; 1048 u8 nr_frags; 1049 1050 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 1051 pr_debug("Error building skb as missing reserved tailroom for xdp"); 1052 return NULL; 1053 } 1054 1055 if (unlikely(xdp_buff_has_frags(xdp))) 1056 nr_frags = sinfo->nr_frags; 1057 1058 skb = build_skb(xdp->data_hard_start, xdp->frame_sz); 1059 if (unlikely(!skb)) 1060 return NULL; 1061 1062 headroom = xdp->data - xdp->data_hard_start; 1063 data_len = xdp->data_end - xdp->data; 1064 skb_reserve(skb, headroom); 1065 __skb_put(skb, data_len); 1066 1067 metasize = xdp->data - xdp->data_meta; 1068 metasize = metasize > 0 ? metasize : 0; 1069 if (metasize) 1070 skb_metadata_set(skb, metasize); 1071 1072 if (unlikely(xdp_buff_has_frags(xdp))) 1073 xdp_update_skb_shared_info(skb, nr_frags, 1074 sinfo->xdp_frags_size, 1075 xdp_frags_truesz, 1076 xdp_buff_is_frag_pfmemalloc(xdp)); 1077 1078 return skb; 1079 } 1080 1081 /* TODO: build xdp in big mode */ 1082 static int virtnet_build_xdp_buff_mrg(struct net_device *dev, 1083 struct virtnet_info *vi, 1084 struct receive_queue *rq, 1085 struct xdp_buff *xdp, 1086 void *buf, 1087 unsigned int len, 1088 unsigned int frame_sz, 1089 int *num_buf, 1090 unsigned int *xdp_frags_truesize, 1091 struct virtnet_rq_stats *stats) 1092 { 1093 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1094 unsigned int headroom, tailroom, room; 1095 unsigned int truesize, cur_frag_size; 1096 struct skb_shared_info *shinfo; 1097 unsigned int xdp_frags_truesz = 0; 1098 struct page *page; 1099 skb_frag_t *frag; 1100 int offset; 1101 void *ctx; 1102 1103 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); 1104 xdp_prepare_buff(xdp, buf - VIRTIO_XDP_HEADROOM, 1105 VIRTIO_XDP_HEADROOM + vi->hdr_len, len - vi->hdr_len, true); 1106 1107 if (!*num_buf) 1108 return 0; 1109 1110 if (*num_buf > 1) { 1111 /* If we want to build multi-buffer xdp, we need 1112 * to specify that the flags of xdp_buff have the 1113 * XDP_FLAGS_HAS_FRAG bit. 1114 */ 1115 if (!xdp_buff_has_frags(xdp)) 1116 xdp_buff_set_frags_flag(xdp); 1117 1118 shinfo = xdp_get_shared_info_from_buff(xdp); 1119 shinfo->nr_frags = 0; 1120 shinfo->xdp_frags_size = 0; 1121 } 1122 1123 if (*num_buf > MAX_SKB_FRAGS + 1) 1124 return -EINVAL; 1125 1126 while (--*num_buf > 0) { 1127 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1128 if (unlikely(!buf)) { 1129 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1130 dev->name, *num_buf, 1131 virtio16_to_cpu(vi->vdev, hdr->num_buffers)); 1132 dev->stats.rx_length_errors++; 1133 return -EINVAL; 1134 } 1135 1136 stats->bytes += len; 1137 page = virt_to_head_page(buf); 1138 offset = buf - page_address(page); 1139 1140 truesize = mergeable_ctx_to_truesize(ctx); 1141 headroom = mergeable_ctx_to_headroom(ctx); 1142 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1143 room = SKB_DATA_ALIGN(headroom + tailroom); 1144 1145 cur_frag_size = truesize; 1146 xdp_frags_truesz += cur_frag_size; 1147 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) { 1148 put_page(page); 1149 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1150 dev->name, len, (unsigned long)(truesize - room)); 1151 dev->stats.rx_length_errors++; 1152 return -EINVAL; 1153 } 1154 1155 frag = &shinfo->frags[shinfo->nr_frags++]; 1156 __skb_frag_set_page(frag, page); 1157 skb_frag_off_set(frag, offset); 1158 skb_frag_size_set(frag, len); 1159 if (page_is_pfmemalloc(page)) 1160 xdp_buff_set_frag_pfmemalloc(xdp); 1161 1162 shinfo->xdp_frags_size += len; 1163 } 1164 1165 *xdp_frags_truesize = xdp_frags_truesz; 1166 return 0; 1167 } 1168 1169 static struct sk_buff *receive_mergeable(struct net_device *dev, 1170 struct virtnet_info *vi, 1171 struct receive_queue *rq, 1172 void *buf, 1173 void *ctx, 1174 unsigned int len, 1175 unsigned int *xdp_xmit, 1176 struct virtnet_rq_stats *stats) 1177 { 1178 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1179 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 1180 struct page *page = virt_to_head_page(buf); 1181 int offset = buf - page_address(page); 1182 struct sk_buff *head_skb, *curr_skb; 1183 struct bpf_prog *xdp_prog; 1184 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1185 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1186 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1187 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1188 unsigned int frame_sz, xdp_room; 1189 int err; 1190 1191 head_skb = NULL; 1192 stats->bytes += len - vi->hdr_len; 1193 1194 if (unlikely(len > truesize - room)) { 1195 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1196 dev->name, len, (unsigned long)(truesize - room)); 1197 dev->stats.rx_length_errors++; 1198 goto err_skb; 1199 } 1200 1201 if (likely(!vi->xdp_enabled)) { 1202 xdp_prog = NULL; 1203 goto skip_xdp; 1204 } 1205 1206 rcu_read_lock(); 1207 xdp_prog = rcu_dereference(rq->xdp_prog); 1208 if (xdp_prog) { 1209 unsigned int xdp_frags_truesz = 0; 1210 struct skb_shared_info *shinfo; 1211 struct xdp_frame *xdpf; 1212 struct page *xdp_page; 1213 struct xdp_buff xdp; 1214 void *data; 1215 u32 act; 1216 int i; 1217 1218 /* Transient failure which in theory could occur if 1219 * in-flight packets from before XDP was enabled reach 1220 * the receive path after XDP is loaded. 1221 */ 1222 if (unlikely(hdr->hdr.gso_type)) 1223 goto err_xdp; 1224 1225 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers 1226 * with headroom may add hole in truesize, which 1227 * make their length exceed PAGE_SIZE. So we disabled the 1228 * hole mechanism for xdp. See add_recvbuf_mergeable(). 1229 */ 1230 frame_sz = truesize; 1231 1232 /* This happens when headroom is not enough because 1233 * of the buffer was prefilled before XDP is set. 1234 * This should only happen for the first several packets. 1235 * In fact, vq reset can be used here to help us clean up 1236 * the prefilled buffers, but many existing devices do not 1237 * support it, and we don't want to bother users who are 1238 * using xdp normally. 1239 */ 1240 if (!xdp_prog->aux->xdp_has_frags && 1241 (num_buf > 1 || headroom < virtnet_get_headroom(vi))) { 1242 /* linearize data for XDP */ 1243 xdp_page = xdp_linearize_page(rq, &num_buf, 1244 page, offset, 1245 VIRTIO_XDP_HEADROOM, 1246 &len); 1247 frame_sz = PAGE_SIZE; 1248 1249 if (!xdp_page) 1250 goto err_xdp; 1251 offset = VIRTIO_XDP_HEADROOM; 1252 } else if (unlikely(headroom < virtnet_get_headroom(vi))) { 1253 xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 1254 sizeof(struct skb_shared_info)); 1255 if (len + xdp_room > PAGE_SIZE) 1256 goto err_xdp; 1257 1258 xdp_page = alloc_page(GFP_ATOMIC); 1259 if (!xdp_page) 1260 goto err_xdp; 1261 1262 memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM, 1263 page_address(page) + offset, len); 1264 frame_sz = PAGE_SIZE; 1265 offset = VIRTIO_XDP_HEADROOM; 1266 } else { 1267 xdp_page = page; 1268 } 1269 1270 data = page_address(xdp_page) + offset; 1271 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz, 1272 &num_buf, &xdp_frags_truesz, stats); 1273 if (unlikely(err)) 1274 goto err_xdp_frags; 1275 1276 act = bpf_prog_run_xdp(xdp_prog, &xdp); 1277 stats->xdp_packets++; 1278 1279 switch (act) { 1280 case XDP_PASS: 1281 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); 1282 if (unlikely(!head_skb)) 1283 goto err_xdp_frags; 1284 1285 if (unlikely(xdp_page != page)) 1286 put_page(page); 1287 rcu_read_unlock(); 1288 return head_skb; 1289 case XDP_TX: 1290 stats->xdp_tx++; 1291 xdpf = xdp_convert_buff_to_frame(&xdp); 1292 if (unlikely(!xdpf)) { 1293 netdev_dbg(dev, "convert buff to frame failed for xdp\n"); 1294 goto err_xdp_frags; 1295 } 1296 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 1297 if (unlikely(!err)) { 1298 xdp_return_frame_rx_napi(xdpf); 1299 } else if (unlikely(err < 0)) { 1300 trace_xdp_exception(vi->dev, xdp_prog, act); 1301 goto err_xdp_frags; 1302 } 1303 *xdp_xmit |= VIRTIO_XDP_TX; 1304 if (unlikely(xdp_page != page)) 1305 put_page(page); 1306 rcu_read_unlock(); 1307 goto xdp_xmit; 1308 case XDP_REDIRECT: 1309 stats->xdp_redirects++; 1310 err = xdp_do_redirect(dev, &xdp, xdp_prog); 1311 if (err) 1312 goto err_xdp_frags; 1313 *xdp_xmit |= VIRTIO_XDP_REDIR; 1314 if (unlikely(xdp_page != page)) 1315 put_page(page); 1316 rcu_read_unlock(); 1317 goto xdp_xmit; 1318 default: 1319 bpf_warn_invalid_xdp_action(vi->dev, xdp_prog, act); 1320 fallthrough; 1321 case XDP_ABORTED: 1322 trace_xdp_exception(vi->dev, xdp_prog, act); 1323 fallthrough; 1324 case XDP_DROP: 1325 goto err_xdp_frags; 1326 } 1327 err_xdp_frags: 1328 if (unlikely(xdp_page != page)) 1329 __free_pages(xdp_page, 0); 1330 1331 if (xdp_buff_has_frags(&xdp)) { 1332 shinfo = xdp_get_shared_info_from_buff(&xdp); 1333 for (i = 0; i < shinfo->nr_frags; i++) { 1334 xdp_page = skb_frag_page(&shinfo->frags[i]); 1335 put_page(xdp_page); 1336 } 1337 } 1338 1339 goto err_xdp; 1340 } 1341 rcu_read_unlock(); 1342 1343 skip_xdp: 1344 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom); 1345 curr_skb = head_skb; 1346 1347 if (unlikely(!curr_skb)) 1348 goto err_skb; 1349 while (--num_buf) { 1350 int num_skb_frags; 1351 1352 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1353 if (unlikely(!buf)) { 1354 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1355 dev->name, num_buf, 1356 virtio16_to_cpu(vi->vdev, 1357 hdr->num_buffers)); 1358 dev->stats.rx_length_errors++; 1359 goto err_buf; 1360 } 1361 1362 stats->bytes += len; 1363 page = virt_to_head_page(buf); 1364 1365 truesize = mergeable_ctx_to_truesize(ctx); 1366 headroom = mergeable_ctx_to_headroom(ctx); 1367 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1368 room = SKB_DATA_ALIGN(headroom + tailroom); 1369 if (unlikely(len > truesize - room)) { 1370 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1371 dev->name, len, (unsigned long)(truesize - room)); 1372 dev->stats.rx_length_errors++; 1373 goto err_skb; 1374 } 1375 1376 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 1377 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 1378 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 1379 1380 if (unlikely(!nskb)) 1381 goto err_skb; 1382 if (curr_skb == head_skb) 1383 skb_shinfo(curr_skb)->frag_list = nskb; 1384 else 1385 curr_skb->next = nskb; 1386 curr_skb = nskb; 1387 head_skb->truesize += nskb->truesize; 1388 num_skb_frags = 0; 1389 } 1390 if (curr_skb != head_skb) { 1391 head_skb->data_len += len; 1392 head_skb->len += len; 1393 head_skb->truesize += truesize; 1394 } 1395 offset = buf - page_address(page); 1396 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 1397 put_page(page); 1398 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 1399 len, truesize); 1400 } else { 1401 skb_add_rx_frag(curr_skb, num_skb_frags, page, 1402 offset, len, truesize); 1403 } 1404 } 1405 1406 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 1407 return head_skb; 1408 1409 err_xdp: 1410 rcu_read_unlock(); 1411 stats->xdp_drops++; 1412 err_skb: 1413 put_page(page); 1414 while (num_buf-- > 1) { 1415 buf = virtqueue_get_buf(rq->vq, &len); 1416 if (unlikely(!buf)) { 1417 pr_debug("%s: rx error: %d buffers missing\n", 1418 dev->name, num_buf); 1419 dev->stats.rx_length_errors++; 1420 break; 1421 } 1422 stats->bytes += len; 1423 page = virt_to_head_page(buf); 1424 put_page(page); 1425 } 1426 err_buf: 1427 stats->drops++; 1428 dev_kfree_skb(head_skb); 1429 xdp_xmit: 1430 return NULL; 1431 } 1432 1433 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash, 1434 struct sk_buff *skb) 1435 { 1436 enum pkt_hash_types rss_hash_type; 1437 1438 if (!hdr_hash || !skb) 1439 return; 1440 1441 switch (__le16_to_cpu(hdr_hash->hash_report)) { 1442 case VIRTIO_NET_HASH_REPORT_TCPv4: 1443 case VIRTIO_NET_HASH_REPORT_UDPv4: 1444 case VIRTIO_NET_HASH_REPORT_TCPv6: 1445 case VIRTIO_NET_HASH_REPORT_UDPv6: 1446 case VIRTIO_NET_HASH_REPORT_TCPv6_EX: 1447 case VIRTIO_NET_HASH_REPORT_UDPv6_EX: 1448 rss_hash_type = PKT_HASH_TYPE_L4; 1449 break; 1450 case VIRTIO_NET_HASH_REPORT_IPv4: 1451 case VIRTIO_NET_HASH_REPORT_IPv6: 1452 case VIRTIO_NET_HASH_REPORT_IPv6_EX: 1453 rss_hash_type = PKT_HASH_TYPE_L3; 1454 break; 1455 case VIRTIO_NET_HASH_REPORT_NONE: 1456 default: 1457 rss_hash_type = PKT_HASH_TYPE_NONE; 1458 } 1459 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type); 1460 } 1461 1462 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 1463 void *buf, unsigned int len, void **ctx, 1464 unsigned int *xdp_xmit, 1465 struct virtnet_rq_stats *stats) 1466 { 1467 struct net_device *dev = vi->dev; 1468 struct sk_buff *skb; 1469 struct virtio_net_hdr_mrg_rxbuf *hdr; 1470 1471 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1472 pr_debug("%s: short packet %i\n", dev->name, len); 1473 dev->stats.rx_length_errors++; 1474 virtnet_rq_free_unused_buf(rq->vq, buf); 1475 return; 1476 } 1477 1478 if (vi->mergeable_rx_bufs) 1479 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1480 stats); 1481 else if (vi->big_packets) 1482 skb = receive_big(dev, vi, rq, buf, len, stats); 1483 else 1484 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1485 1486 if (unlikely(!skb)) 1487 return; 1488 1489 hdr = skb_vnet_hdr(skb); 1490 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report) 1491 virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb); 1492 1493 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1494 skb->ip_summed = CHECKSUM_UNNECESSARY; 1495 1496 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1497 virtio_is_little_endian(vi->vdev))) { 1498 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1499 dev->name, hdr->hdr.gso_type, 1500 hdr->hdr.gso_size); 1501 goto frame_err; 1502 } 1503 1504 skb_record_rx_queue(skb, vq2rxq(rq->vq)); 1505 skb->protocol = eth_type_trans(skb, dev); 1506 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1507 ntohs(skb->protocol), skb->len, skb->pkt_type); 1508 1509 napi_gro_receive(&rq->napi, skb); 1510 return; 1511 1512 frame_err: 1513 dev->stats.rx_frame_errors++; 1514 dev_kfree_skb(skb); 1515 } 1516 1517 /* Unlike mergeable buffers, all buffers are allocated to the 1518 * same size, except for the headroom. For this reason we do 1519 * not need to use mergeable_len_to_ctx here - it is enough 1520 * to store the headroom as the context ignoring the truesize. 1521 */ 1522 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1523 gfp_t gfp) 1524 { 1525 struct page_frag *alloc_frag = &rq->alloc_frag; 1526 char *buf; 1527 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1528 void *ctx = (void *)(unsigned long)xdp_headroom; 1529 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1530 int err; 1531 1532 len = SKB_DATA_ALIGN(len) + 1533 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1534 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1535 return -ENOMEM; 1536 1537 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1538 get_page(alloc_frag->page); 1539 alloc_frag->offset += len; 1540 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1541 vi->hdr_len + GOOD_PACKET_LEN); 1542 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1543 if (err < 0) 1544 put_page(virt_to_head_page(buf)); 1545 return err; 1546 } 1547 1548 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1549 gfp_t gfp) 1550 { 1551 struct page *first, *list = NULL; 1552 char *p; 1553 int i, err, offset; 1554 1555 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2); 1556 1557 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */ 1558 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) { 1559 first = get_a_page(rq, gfp); 1560 if (!first) { 1561 if (list) 1562 give_pages(rq, list); 1563 return -ENOMEM; 1564 } 1565 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1566 1567 /* chain new page in list head to match sg */ 1568 first->private = (unsigned long)list; 1569 list = first; 1570 } 1571 1572 first = get_a_page(rq, gfp); 1573 if (!first) { 1574 give_pages(rq, list); 1575 return -ENOMEM; 1576 } 1577 p = page_address(first); 1578 1579 /* rq->sg[0], rq->sg[1] share the same page */ 1580 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1581 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1582 1583 /* rq->sg[1] for data packet, from offset */ 1584 offset = sizeof(struct padded_vnet_hdr); 1585 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1586 1587 /* chain first in list head */ 1588 first->private = (unsigned long)list; 1589 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2, 1590 first, gfp); 1591 if (err < 0) 1592 give_pages(rq, first); 1593 1594 return err; 1595 } 1596 1597 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1598 struct ewma_pkt_len *avg_pkt_len, 1599 unsigned int room) 1600 { 1601 struct virtnet_info *vi = rq->vq->vdev->priv; 1602 const size_t hdr_len = vi->hdr_len; 1603 unsigned int len; 1604 1605 if (room) 1606 return PAGE_SIZE - room; 1607 1608 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1609 rq->min_buf_len, PAGE_SIZE - hdr_len); 1610 1611 return ALIGN(len, L1_CACHE_BYTES); 1612 } 1613 1614 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1615 struct receive_queue *rq, gfp_t gfp) 1616 { 1617 struct page_frag *alloc_frag = &rq->alloc_frag; 1618 unsigned int headroom = virtnet_get_headroom(vi); 1619 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1620 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1621 char *buf; 1622 void *ctx; 1623 int err; 1624 unsigned int len, hole; 1625 1626 /* Extra tailroom is needed to satisfy XDP's assumption. This 1627 * means rx frags coalescing won't work, but consider we've 1628 * disabled GSO for XDP, it won't be a big issue. 1629 */ 1630 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1631 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1632 return -ENOMEM; 1633 1634 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1635 buf += headroom; /* advance address leaving hole at front of pkt */ 1636 get_page(alloc_frag->page); 1637 alloc_frag->offset += len + room; 1638 hole = alloc_frag->size - alloc_frag->offset; 1639 if (hole < len + room) { 1640 /* To avoid internal fragmentation, if there is very likely not 1641 * enough space for another buffer, add the remaining space to 1642 * the current buffer. 1643 * XDP core assumes that frame_size of xdp_buff and the length 1644 * of the frag are PAGE_SIZE, so we disable the hole mechanism. 1645 */ 1646 if (!headroom) 1647 len += hole; 1648 alloc_frag->offset += hole; 1649 } 1650 1651 sg_init_one(rq->sg, buf, len); 1652 ctx = mergeable_len_to_ctx(len + room, headroom); 1653 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1654 if (err < 0) 1655 put_page(virt_to_head_page(buf)); 1656 1657 return err; 1658 } 1659 1660 /* 1661 * Returns false if we couldn't fill entirely (OOM). 1662 * 1663 * Normally run in the receive path, but can also be run from ndo_open 1664 * before we're receiving packets, or from refill_work which is 1665 * careful to disable receiving (using napi_disable). 1666 */ 1667 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1668 gfp_t gfp) 1669 { 1670 int err; 1671 bool oom; 1672 1673 do { 1674 if (vi->mergeable_rx_bufs) 1675 err = add_recvbuf_mergeable(vi, rq, gfp); 1676 else if (vi->big_packets) 1677 err = add_recvbuf_big(vi, rq, gfp); 1678 else 1679 err = add_recvbuf_small(vi, rq, gfp); 1680 1681 oom = err == -ENOMEM; 1682 if (err) 1683 break; 1684 } while (rq->vq->num_free); 1685 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1686 unsigned long flags; 1687 1688 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); 1689 rq->stats.kicks++; 1690 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); 1691 } 1692 1693 return !oom; 1694 } 1695 1696 static void skb_recv_done(struct virtqueue *rvq) 1697 { 1698 struct virtnet_info *vi = rvq->vdev->priv; 1699 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1700 1701 virtqueue_napi_schedule(&rq->napi, rvq); 1702 } 1703 1704 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1705 { 1706 napi_enable(napi); 1707 1708 /* If all buffers were filled by other side before we napi_enabled, we 1709 * won't get another interrupt, so process any outstanding packets now. 1710 * Call local_bh_enable after to trigger softIRQ processing. 1711 */ 1712 local_bh_disable(); 1713 virtqueue_napi_schedule(napi, vq); 1714 local_bh_enable(); 1715 } 1716 1717 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1718 struct virtqueue *vq, 1719 struct napi_struct *napi) 1720 { 1721 if (!napi->weight) 1722 return; 1723 1724 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1725 * enable the feature if this is likely affine with the transmit path. 1726 */ 1727 if (!vi->affinity_hint_set) { 1728 napi->weight = 0; 1729 return; 1730 } 1731 1732 return virtnet_napi_enable(vq, napi); 1733 } 1734 1735 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1736 { 1737 if (napi->weight) 1738 napi_disable(napi); 1739 } 1740 1741 static void refill_work(struct work_struct *work) 1742 { 1743 struct virtnet_info *vi = 1744 container_of(work, struct virtnet_info, refill.work); 1745 bool still_empty; 1746 int i; 1747 1748 for (i = 0; i < vi->curr_queue_pairs; i++) { 1749 struct receive_queue *rq = &vi->rq[i]; 1750 1751 napi_disable(&rq->napi); 1752 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1753 virtnet_napi_enable(rq->vq, &rq->napi); 1754 1755 /* In theory, this can happen: if we don't get any buffers in 1756 * we will *never* try to fill again. 1757 */ 1758 if (still_empty) 1759 schedule_delayed_work(&vi->refill, HZ/2); 1760 } 1761 } 1762 1763 static int virtnet_receive(struct receive_queue *rq, int budget, 1764 unsigned int *xdp_xmit) 1765 { 1766 struct virtnet_info *vi = rq->vq->vdev->priv; 1767 struct virtnet_rq_stats stats = {}; 1768 unsigned int len; 1769 void *buf; 1770 int i; 1771 1772 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1773 void *ctx; 1774 1775 while (stats.packets < budget && 1776 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1777 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1778 stats.packets++; 1779 } 1780 } else { 1781 while (stats.packets < budget && 1782 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1783 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1784 stats.packets++; 1785 } 1786 } 1787 1788 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { 1789 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { 1790 spin_lock(&vi->refill_lock); 1791 if (vi->refill_enabled) 1792 schedule_delayed_work(&vi->refill, 0); 1793 spin_unlock(&vi->refill_lock); 1794 } 1795 } 1796 1797 u64_stats_update_begin(&rq->stats.syncp); 1798 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1799 size_t offset = virtnet_rq_stats_desc[i].offset; 1800 u64 *item; 1801 1802 item = (u64 *)((u8 *)&rq->stats + offset); 1803 *item += *(u64 *)((u8 *)&stats + offset); 1804 } 1805 u64_stats_update_end(&rq->stats.syncp); 1806 1807 return stats.packets; 1808 } 1809 1810 static void virtnet_poll_cleantx(struct receive_queue *rq) 1811 { 1812 struct virtnet_info *vi = rq->vq->vdev->priv; 1813 unsigned int index = vq2rxq(rq->vq); 1814 struct send_queue *sq = &vi->sq[index]; 1815 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1816 1817 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) 1818 return; 1819 1820 if (__netif_tx_trylock(txq)) { 1821 if (sq->reset) { 1822 __netif_tx_unlock(txq); 1823 return; 1824 } 1825 1826 do { 1827 virtqueue_disable_cb(sq->vq); 1828 free_old_xmit_skbs(sq, true); 1829 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 1830 1831 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1832 netif_tx_wake_queue(txq); 1833 1834 __netif_tx_unlock(txq); 1835 } 1836 } 1837 1838 static int virtnet_poll(struct napi_struct *napi, int budget) 1839 { 1840 struct receive_queue *rq = 1841 container_of(napi, struct receive_queue, napi); 1842 struct virtnet_info *vi = rq->vq->vdev->priv; 1843 struct send_queue *sq; 1844 unsigned int received; 1845 unsigned int xdp_xmit = 0; 1846 1847 virtnet_poll_cleantx(rq); 1848 1849 received = virtnet_receive(rq, budget, &xdp_xmit); 1850 1851 if (xdp_xmit & VIRTIO_XDP_REDIR) 1852 xdp_do_flush(); 1853 1854 /* Out of packets? */ 1855 if (received < budget) 1856 virtqueue_napi_complete(napi, rq->vq, received); 1857 1858 if (xdp_xmit & VIRTIO_XDP_TX) { 1859 sq = virtnet_xdp_get_sq(vi); 1860 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1861 u64_stats_update_begin(&sq->stats.syncp); 1862 sq->stats.kicks++; 1863 u64_stats_update_end(&sq->stats.syncp); 1864 } 1865 virtnet_xdp_put_sq(vi, sq); 1866 } 1867 1868 return received; 1869 } 1870 1871 static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index) 1872 { 1873 virtnet_napi_tx_disable(&vi->sq[qp_index].napi); 1874 napi_disable(&vi->rq[qp_index].napi); 1875 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); 1876 } 1877 1878 static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index) 1879 { 1880 struct net_device *dev = vi->dev; 1881 int err; 1882 1883 err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index, 1884 vi->rq[qp_index].napi.napi_id); 1885 if (err < 0) 1886 return err; 1887 1888 err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq, 1889 MEM_TYPE_PAGE_SHARED, NULL); 1890 if (err < 0) 1891 goto err_xdp_reg_mem_model; 1892 1893 virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi); 1894 virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi); 1895 1896 return 0; 1897 1898 err_xdp_reg_mem_model: 1899 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); 1900 return err; 1901 } 1902 1903 static int virtnet_open(struct net_device *dev) 1904 { 1905 struct virtnet_info *vi = netdev_priv(dev); 1906 int i, err; 1907 1908 enable_delayed_refill(vi); 1909 1910 for (i = 0; i < vi->max_queue_pairs; i++) { 1911 if (i < vi->curr_queue_pairs) 1912 /* Make sure we have some buffers: if oom use wq. */ 1913 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1914 schedule_delayed_work(&vi->refill, 0); 1915 1916 err = virtnet_enable_queue_pair(vi, i); 1917 if (err < 0) 1918 goto err_enable_qp; 1919 } 1920 1921 return 0; 1922 1923 err_enable_qp: 1924 disable_delayed_refill(vi); 1925 cancel_delayed_work_sync(&vi->refill); 1926 1927 for (i--; i >= 0; i--) 1928 virtnet_disable_queue_pair(vi, i); 1929 return err; 1930 } 1931 1932 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1933 { 1934 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1935 struct virtnet_info *vi = sq->vq->vdev->priv; 1936 unsigned int index = vq2txq(sq->vq); 1937 struct netdev_queue *txq; 1938 int opaque; 1939 bool done; 1940 1941 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { 1942 /* We don't need to enable cb for XDP */ 1943 napi_complete_done(napi, 0); 1944 return 0; 1945 } 1946 1947 txq = netdev_get_tx_queue(vi->dev, index); 1948 __netif_tx_lock(txq, raw_smp_processor_id()); 1949 virtqueue_disable_cb(sq->vq); 1950 free_old_xmit_skbs(sq, true); 1951 1952 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1953 netif_tx_wake_queue(txq); 1954 1955 opaque = virtqueue_enable_cb_prepare(sq->vq); 1956 1957 done = napi_complete_done(napi, 0); 1958 1959 if (!done) 1960 virtqueue_disable_cb(sq->vq); 1961 1962 __netif_tx_unlock(txq); 1963 1964 if (done) { 1965 if (unlikely(virtqueue_poll(sq->vq, opaque))) { 1966 if (napi_schedule_prep(napi)) { 1967 __netif_tx_lock(txq, raw_smp_processor_id()); 1968 virtqueue_disable_cb(sq->vq); 1969 __netif_tx_unlock(txq); 1970 __napi_schedule(napi); 1971 } 1972 } 1973 } 1974 1975 return 0; 1976 } 1977 1978 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1979 { 1980 struct virtio_net_hdr_mrg_rxbuf *hdr; 1981 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1982 struct virtnet_info *vi = sq->vq->vdev->priv; 1983 int num_sg; 1984 unsigned hdr_len = vi->hdr_len; 1985 bool can_push; 1986 1987 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1988 1989 can_push = vi->any_header_sg && 1990 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1991 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1992 /* Even if we can, don't push here yet as this would skew 1993 * csum_start offset below. */ 1994 if (can_push) 1995 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 1996 else 1997 hdr = skb_vnet_hdr(skb); 1998 1999 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 2000 virtio_is_little_endian(vi->vdev), false, 2001 0)) 2002 return -EPROTO; 2003 2004 if (vi->mergeable_rx_bufs) 2005 hdr->num_buffers = 0; 2006 2007 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 2008 if (can_push) { 2009 __skb_push(skb, hdr_len); 2010 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 2011 if (unlikely(num_sg < 0)) 2012 return num_sg; 2013 /* Pull header back to avoid skew in tx bytes calculations. */ 2014 __skb_pull(skb, hdr_len); 2015 } else { 2016 sg_set_buf(sq->sg, hdr, hdr_len); 2017 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 2018 if (unlikely(num_sg < 0)) 2019 return num_sg; 2020 num_sg++; 2021 } 2022 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 2023 } 2024 2025 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 2026 { 2027 struct virtnet_info *vi = netdev_priv(dev); 2028 int qnum = skb_get_queue_mapping(skb); 2029 struct send_queue *sq = &vi->sq[qnum]; 2030 int err; 2031 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 2032 bool kick = !netdev_xmit_more(); 2033 bool use_napi = sq->napi.weight; 2034 2035 /* Free up any pending old buffers before queueing new ones. */ 2036 do { 2037 if (use_napi) 2038 virtqueue_disable_cb(sq->vq); 2039 2040 free_old_xmit_skbs(sq, false); 2041 2042 } while (use_napi && kick && 2043 unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 2044 2045 /* timestamp packet in software */ 2046 skb_tx_timestamp(skb); 2047 2048 /* Try to transmit */ 2049 err = xmit_skb(sq, skb); 2050 2051 /* This should not happen! */ 2052 if (unlikely(err)) { 2053 dev->stats.tx_fifo_errors++; 2054 if (net_ratelimit()) 2055 dev_warn(&dev->dev, 2056 "Unexpected TXQ (%d) queue failure: %d\n", 2057 qnum, err); 2058 dev->stats.tx_dropped++; 2059 dev_kfree_skb_any(skb); 2060 return NETDEV_TX_OK; 2061 } 2062 2063 /* Don't wait up for transmitted skbs to be freed. */ 2064 if (!use_napi) { 2065 skb_orphan(skb); 2066 nf_reset_ct(skb); 2067 } 2068 2069 check_sq_full_and_disable(vi, dev, sq); 2070 2071 if (kick || netif_xmit_stopped(txq)) { 2072 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 2073 u64_stats_update_begin(&sq->stats.syncp); 2074 sq->stats.kicks++; 2075 u64_stats_update_end(&sq->stats.syncp); 2076 } 2077 } 2078 2079 return NETDEV_TX_OK; 2080 } 2081 2082 static int virtnet_rx_resize(struct virtnet_info *vi, 2083 struct receive_queue *rq, u32 ring_num) 2084 { 2085 bool running = netif_running(vi->dev); 2086 int err, qindex; 2087 2088 qindex = rq - vi->rq; 2089 2090 if (running) 2091 napi_disable(&rq->napi); 2092 2093 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); 2094 if (err) 2095 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); 2096 2097 if (!try_fill_recv(vi, rq, GFP_KERNEL)) 2098 schedule_delayed_work(&vi->refill, 0); 2099 2100 if (running) 2101 virtnet_napi_enable(rq->vq, &rq->napi); 2102 return err; 2103 } 2104 2105 static int virtnet_tx_resize(struct virtnet_info *vi, 2106 struct send_queue *sq, u32 ring_num) 2107 { 2108 bool running = netif_running(vi->dev); 2109 struct netdev_queue *txq; 2110 int err, qindex; 2111 2112 qindex = sq - vi->sq; 2113 2114 if (running) 2115 virtnet_napi_tx_disable(&sq->napi); 2116 2117 txq = netdev_get_tx_queue(vi->dev, qindex); 2118 2119 /* 1. wait all ximt complete 2120 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue() 2121 */ 2122 __netif_tx_lock_bh(txq); 2123 2124 /* Prevent rx poll from accessing sq. */ 2125 sq->reset = true; 2126 2127 /* Prevent the upper layer from trying to send packets. */ 2128 netif_stop_subqueue(vi->dev, qindex); 2129 2130 __netif_tx_unlock_bh(txq); 2131 2132 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf); 2133 if (err) 2134 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err); 2135 2136 __netif_tx_lock_bh(txq); 2137 sq->reset = false; 2138 netif_tx_wake_queue(txq); 2139 __netif_tx_unlock_bh(txq); 2140 2141 if (running) 2142 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi); 2143 return err; 2144 } 2145 2146 /* 2147 * Send command via the control virtqueue and check status. Commands 2148 * supported by the hypervisor, as indicated by feature bits, should 2149 * never fail unless improperly formatted. 2150 */ 2151 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 2152 struct scatterlist *out) 2153 { 2154 struct scatterlist *sgs[4], hdr, stat; 2155 unsigned out_num = 0, tmp; 2156 int ret; 2157 2158 /* Caller should know better */ 2159 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 2160 2161 vi->ctrl->status = ~0; 2162 vi->ctrl->hdr.class = class; 2163 vi->ctrl->hdr.cmd = cmd; 2164 /* Add header */ 2165 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 2166 sgs[out_num++] = &hdr; 2167 2168 if (out) 2169 sgs[out_num++] = out; 2170 2171 /* Add return status. */ 2172 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 2173 sgs[out_num] = &stat; 2174 2175 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 2176 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 2177 if (ret < 0) { 2178 dev_warn(&vi->vdev->dev, 2179 "Failed to add sgs for command vq: %d\n.", ret); 2180 return false; 2181 } 2182 2183 if (unlikely(!virtqueue_kick(vi->cvq))) 2184 return vi->ctrl->status == VIRTIO_NET_OK; 2185 2186 /* Spin for a response, the kick causes an ioport write, trapping 2187 * into the hypervisor, so the request should be handled immediately. 2188 */ 2189 while (!virtqueue_get_buf(vi->cvq, &tmp) && 2190 !virtqueue_is_broken(vi->cvq)) 2191 cpu_relax(); 2192 2193 return vi->ctrl->status == VIRTIO_NET_OK; 2194 } 2195 2196 static int virtnet_set_mac_address(struct net_device *dev, void *p) 2197 { 2198 struct virtnet_info *vi = netdev_priv(dev); 2199 struct virtio_device *vdev = vi->vdev; 2200 int ret; 2201 struct sockaddr *addr; 2202 struct scatterlist sg; 2203 2204 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2205 return -EOPNOTSUPP; 2206 2207 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 2208 if (!addr) 2209 return -ENOMEM; 2210 2211 ret = eth_prepare_mac_addr_change(dev, addr); 2212 if (ret) 2213 goto out; 2214 2215 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 2216 sg_init_one(&sg, addr->sa_data, dev->addr_len); 2217 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2218 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 2219 dev_warn(&vdev->dev, 2220 "Failed to set mac address by vq command.\n"); 2221 ret = -EINVAL; 2222 goto out; 2223 } 2224 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 2225 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 2226 unsigned int i; 2227 2228 /* Naturally, this has an atomicity problem. */ 2229 for (i = 0; i < dev->addr_len; i++) 2230 virtio_cwrite8(vdev, 2231 offsetof(struct virtio_net_config, mac) + 2232 i, addr->sa_data[i]); 2233 } 2234 2235 eth_commit_mac_addr_change(dev, p); 2236 ret = 0; 2237 2238 out: 2239 kfree(addr); 2240 return ret; 2241 } 2242 2243 static void virtnet_stats(struct net_device *dev, 2244 struct rtnl_link_stats64 *tot) 2245 { 2246 struct virtnet_info *vi = netdev_priv(dev); 2247 unsigned int start; 2248 int i; 2249 2250 for (i = 0; i < vi->max_queue_pairs; i++) { 2251 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops; 2252 struct receive_queue *rq = &vi->rq[i]; 2253 struct send_queue *sq = &vi->sq[i]; 2254 2255 do { 2256 start = u64_stats_fetch_begin(&sq->stats.syncp); 2257 tpackets = sq->stats.packets; 2258 tbytes = sq->stats.bytes; 2259 terrors = sq->stats.tx_timeouts; 2260 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2261 2262 do { 2263 start = u64_stats_fetch_begin(&rq->stats.syncp); 2264 rpackets = rq->stats.packets; 2265 rbytes = rq->stats.bytes; 2266 rdrops = rq->stats.drops; 2267 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2268 2269 tot->rx_packets += rpackets; 2270 tot->tx_packets += tpackets; 2271 tot->rx_bytes += rbytes; 2272 tot->tx_bytes += tbytes; 2273 tot->rx_dropped += rdrops; 2274 tot->tx_errors += terrors; 2275 } 2276 2277 tot->tx_dropped = dev->stats.tx_dropped; 2278 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 2279 tot->rx_length_errors = dev->stats.rx_length_errors; 2280 tot->rx_frame_errors = dev->stats.rx_frame_errors; 2281 } 2282 2283 static void virtnet_ack_link_announce(struct virtnet_info *vi) 2284 { 2285 rtnl_lock(); 2286 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 2287 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 2288 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 2289 rtnl_unlock(); 2290 } 2291 2292 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2293 { 2294 struct scatterlist sg; 2295 struct net_device *dev = vi->dev; 2296 2297 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 2298 return 0; 2299 2300 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 2301 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 2302 2303 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2304 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 2305 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 2306 queue_pairs); 2307 return -EINVAL; 2308 } else { 2309 vi->curr_queue_pairs = queue_pairs; 2310 /* virtnet_open() will refill when device is going to up. */ 2311 if (dev->flags & IFF_UP) 2312 schedule_delayed_work(&vi->refill, 0); 2313 } 2314 2315 return 0; 2316 } 2317 2318 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2319 { 2320 int err; 2321 2322 rtnl_lock(); 2323 err = _virtnet_set_queues(vi, queue_pairs); 2324 rtnl_unlock(); 2325 return err; 2326 } 2327 2328 static int virtnet_close(struct net_device *dev) 2329 { 2330 struct virtnet_info *vi = netdev_priv(dev); 2331 int i; 2332 2333 /* Make sure NAPI doesn't schedule refill work */ 2334 disable_delayed_refill(vi); 2335 /* Make sure refill_work doesn't re-enable napi! */ 2336 cancel_delayed_work_sync(&vi->refill); 2337 2338 for (i = 0; i < vi->max_queue_pairs; i++) 2339 virtnet_disable_queue_pair(vi, i); 2340 2341 return 0; 2342 } 2343 2344 static void virtnet_set_rx_mode(struct net_device *dev) 2345 { 2346 struct virtnet_info *vi = netdev_priv(dev); 2347 struct scatterlist sg[2]; 2348 struct virtio_net_ctrl_mac *mac_data; 2349 struct netdev_hw_addr *ha; 2350 int uc_count; 2351 int mc_count; 2352 void *buf; 2353 int i; 2354 2355 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 2356 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 2357 return; 2358 2359 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 2360 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 2361 2362 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 2363 2364 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2365 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 2366 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 2367 vi->ctrl->promisc ? "en" : "dis"); 2368 2369 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 2370 2371 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2372 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 2373 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 2374 vi->ctrl->allmulti ? "en" : "dis"); 2375 2376 uc_count = netdev_uc_count(dev); 2377 mc_count = netdev_mc_count(dev); 2378 /* MAC filter - use one buffer for both lists */ 2379 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 2380 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 2381 mac_data = buf; 2382 if (!buf) 2383 return; 2384 2385 sg_init_table(sg, 2); 2386 2387 /* Store the unicast list and count in the front of the buffer */ 2388 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 2389 i = 0; 2390 netdev_for_each_uc_addr(ha, dev) 2391 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2392 2393 sg_set_buf(&sg[0], mac_data, 2394 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 2395 2396 /* multicast list and count fill the end */ 2397 mac_data = (void *)&mac_data->macs[uc_count][0]; 2398 2399 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 2400 i = 0; 2401 netdev_for_each_mc_addr(ha, dev) 2402 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2403 2404 sg_set_buf(&sg[1], mac_data, 2405 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 2406 2407 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2408 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 2409 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 2410 2411 kfree(buf); 2412 } 2413 2414 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 2415 __be16 proto, u16 vid) 2416 { 2417 struct virtnet_info *vi = netdev_priv(dev); 2418 struct scatterlist sg; 2419 2420 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2421 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2422 2423 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2424 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 2425 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 2426 return 0; 2427 } 2428 2429 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 2430 __be16 proto, u16 vid) 2431 { 2432 struct virtnet_info *vi = netdev_priv(dev); 2433 struct scatterlist sg; 2434 2435 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2436 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2437 2438 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2439 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 2440 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 2441 return 0; 2442 } 2443 2444 static void virtnet_clean_affinity(struct virtnet_info *vi) 2445 { 2446 int i; 2447 2448 if (vi->affinity_hint_set) { 2449 for (i = 0; i < vi->max_queue_pairs; i++) { 2450 virtqueue_set_affinity(vi->rq[i].vq, NULL); 2451 virtqueue_set_affinity(vi->sq[i].vq, NULL); 2452 } 2453 2454 vi->affinity_hint_set = false; 2455 } 2456 } 2457 2458 static void virtnet_set_affinity(struct virtnet_info *vi) 2459 { 2460 cpumask_var_t mask; 2461 int stragglers; 2462 int group_size; 2463 int i, j, cpu; 2464 int num_cpu; 2465 int stride; 2466 2467 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 2468 virtnet_clean_affinity(vi); 2469 return; 2470 } 2471 2472 num_cpu = num_online_cpus(); 2473 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 2474 stragglers = num_cpu >= vi->curr_queue_pairs ? 2475 num_cpu % vi->curr_queue_pairs : 2476 0; 2477 cpu = cpumask_first(cpu_online_mask); 2478 2479 for (i = 0; i < vi->curr_queue_pairs; i++) { 2480 group_size = stride + (i < stragglers ? 1 : 0); 2481 2482 for (j = 0; j < group_size; j++) { 2483 cpumask_set_cpu(cpu, mask); 2484 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 2485 nr_cpu_ids, false); 2486 } 2487 virtqueue_set_affinity(vi->rq[i].vq, mask); 2488 virtqueue_set_affinity(vi->sq[i].vq, mask); 2489 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS); 2490 cpumask_clear(mask); 2491 } 2492 2493 vi->affinity_hint_set = true; 2494 free_cpumask_var(mask); 2495 } 2496 2497 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 2498 { 2499 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2500 node); 2501 virtnet_set_affinity(vi); 2502 return 0; 2503 } 2504 2505 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 2506 { 2507 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2508 node_dead); 2509 virtnet_set_affinity(vi); 2510 return 0; 2511 } 2512 2513 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 2514 { 2515 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2516 node); 2517 2518 virtnet_clean_affinity(vi); 2519 return 0; 2520 } 2521 2522 static enum cpuhp_state virtionet_online; 2523 2524 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 2525 { 2526 int ret; 2527 2528 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 2529 if (ret) 2530 return ret; 2531 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2532 &vi->node_dead); 2533 if (!ret) 2534 return ret; 2535 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2536 return ret; 2537 } 2538 2539 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 2540 { 2541 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2542 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2543 &vi->node_dead); 2544 } 2545 2546 static void virtnet_get_ringparam(struct net_device *dev, 2547 struct ethtool_ringparam *ring, 2548 struct kernel_ethtool_ringparam *kernel_ring, 2549 struct netlink_ext_ack *extack) 2550 { 2551 struct virtnet_info *vi = netdev_priv(dev); 2552 2553 ring->rx_max_pending = vi->rq[0].vq->num_max; 2554 ring->tx_max_pending = vi->sq[0].vq->num_max; 2555 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2556 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2557 } 2558 2559 static int virtnet_set_ringparam(struct net_device *dev, 2560 struct ethtool_ringparam *ring, 2561 struct kernel_ethtool_ringparam *kernel_ring, 2562 struct netlink_ext_ack *extack) 2563 { 2564 struct virtnet_info *vi = netdev_priv(dev); 2565 u32 rx_pending, tx_pending; 2566 struct receive_queue *rq; 2567 struct send_queue *sq; 2568 int i, err; 2569 2570 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 2571 return -EINVAL; 2572 2573 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2574 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2575 2576 if (ring->rx_pending == rx_pending && 2577 ring->tx_pending == tx_pending) 2578 return 0; 2579 2580 if (ring->rx_pending > vi->rq[0].vq->num_max) 2581 return -EINVAL; 2582 2583 if (ring->tx_pending > vi->sq[0].vq->num_max) 2584 return -EINVAL; 2585 2586 for (i = 0; i < vi->max_queue_pairs; i++) { 2587 rq = vi->rq + i; 2588 sq = vi->sq + i; 2589 2590 if (ring->tx_pending != tx_pending) { 2591 err = virtnet_tx_resize(vi, sq, ring->tx_pending); 2592 if (err) 2593 return err; 2594 } 2595 2596 if (ring->rx_pending != rx_pending) { 2597 err = virtnet_rx_resize(vi, rq, ring->rx_pending); 2598 if (err) 2599 return err; 2600 } 2601 } 2602 2603 return 0; 2604 } 2605 2606 static bool virtnet_commit_rss_command(struct virtnet_info *vi) 2607 { 2608 struct net_device *dev = vi->dev; 2609 struct scatterlist sgs[4]; 2610 unsigned int sg_buf_size; 2611 2612 /* prepare sgs */ 2613 sg_init_table(sgs, 4); 2614 2615 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); 2616 sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); 2617 2618 sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1); 2619 sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); 2620 2621 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) 2622 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); 2623 sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); 2624 2625 sg_buf_size = vi->rss_key_size; 2626 sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size); 2627 2628 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2629 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG 2630 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) { 2631 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); 2632 return false; 2633 } 2634 return true; 2635 } 2636 2637 static void virtnet_init_default_rss(struct virtnet_info *vi) 2638 { 2639 u32 indir_val = 0; 2640 int i = 0; 2641 2642 vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; 2643 vi->rss_hash_types_saved = vi->rss_hash_types_supported; 2644 vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size 2645 ? vi->rss_indir_table_size - 1 : 0; 2646 vi->ctrl->rss.unclassified_queue = 0; 2647 2648 for (; i < vi->rss_indir_table_size; ++i) { 2649 indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); 2650 vi->ctrl->rss.indirection_table[i] = indir_val; 2651 } 2652 2653 vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; 2654 vi->ctrl->rss.hash_key_length = vi->rss_key_size; 2655 2656 netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); 2657 } 2658 2659 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info) 2660 { 2661 info->data = 0; 2662 switch (info->flow_type) { 2663 case TCP_V4_FLOW: 2664 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 2665 info->data = RXH_IP_SRC | RXH_IP_DST | 2666 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2667 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2668 info->data = RXH_IP_SRC | RXH_IP_DST; 2669 } 2670 break; 2671 case TCP_V6_FLOW: 2672 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 2673 info->data = RXH_IP_SRC | RXH_IP_DST | 2674 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2675 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2676 info->data = RXH_IP_SRC | RXH_IP_DST; 2677 } 2678 break; 2679 case UDP_V4_FLOW: 2680 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 2681 info->data = RXH_IP_SRC | RXH_IP_DST | 2682 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2683 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2684 info->data = RXH_IP_SRC | RXH_IP_DST; 2685 } 2686 break; 2687 case UDP_V6_FLOW: 2688 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 2689 info->data = RXH_IP_SRC | RXH_IP_DST | 2690 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2691 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2692 info->data = RXH_IP_SRC | RXH_IP_DST; 2693 } 2694 break; 2695 case IPV4_FLOW: 2696 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) 2697 info->data = RXH_IP_SRC | RXH_IP_DST; 2698 2699 break; 2700 case IPV6_FLOW: 2701 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) 2702 info->data = RXH_IP_SRC | RXH_IP_DST; 2703 2704 break; 2705 default: 2706 info->data = 0; 2707 break; 2708 } 2709 } 2710 2711 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info) 2712 { 2713 u32 new_hashtypes = vi->rss_hash_types_saved; 2714 bool is_disable = info->data & RXH_DISCARD; 2715 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3); 2716 2717 /* supports only 'sd', 'sdfn' and 'r' */ 2718 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable)) 2719 return false; 2720 2721 switch (info->flow_type) { 2722 case TCP_V4_FLOW: 2723 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4); 2724 if (!is_disable) 2725 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2726 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0); 2727 break; 2728 case UDP_V4_FLOW: 2729 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4); 2730 if (!is_disable) 2731 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2732 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0); 2733 break; 2734 case IPV4_FLOW: 2735 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2736 if (!is_disable) 2737 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2738 break; 2739 case TCP_V6_FLOW: 2740 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6); 2741 if (!is_disable) 2742 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2743 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0); 2744 break; 2745 case UDP_V6_FLOW: 2746 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6); 2747 if (!is_disable) 2748 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2749 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0); 2750 break; 2751 case IPV6_FLOW: 2752 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2753 if (!is_disable) 2754 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2755 break; 2756 default: 2757 /* unsupported flow */ 2758 return false; 2759 } 2760 2761 /* if unsupported hashtype was set */ 2762 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported)) 2763 return false; 2764 2765 if (new_hashtypes != vi->rss_hash_types_saved) { 2766 vi->rss_hash_types_saved = new_hashtypes; 2767 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 2768 if (vi->dev->features & NETIF_F_RXHASH) 2769 return virtnet_commit_rss_command(vi); 2770 } 2771 2772 return true; 2773 } 2774 2775 static void virtnet_get_drvinfo(struct net_device *dev, 2776 struct ethtool_drvinfo *info) 2777 { 2778 struct virtnet_info *vi = netdev_priv(dev); 2779 struct virtio_device *vdev = vi->vdev; 2780 2781 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 2782 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 2783 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 2784 2785 } 2786 2787 /* TODO: Eliminate OOO packets during switching */ 2788 static int virtnet_set_channels(struct net_device *dev, 2789 struct ethtool_channels *channels) 2790 { 2791 struct virtnet_info *vi = netdev_priv(dev); 2792 u16 queue_pairs = channels->combined_count; 2793 int err; 2794 2795 /* We don't support separate rx/tx channels. 2796 * We don't allow setting 'other' channels. 2797 */ 2798 if (channels->rx_count || channels->tx_count || channels->other_count) 2799 return -EINVAL; 2800 2801 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2802 return -EINVAL; 2803 2804 /* For now we don't support modifying channels while XDP is loaded 2805 * also when XDP is loaded all RX queues have XDP programs so we only 2806 * need to check a single RX queue. 2807 */ 2808 if (vi->rq[0].xdp_prog) 2809 return -EINVAL; 2810 2811 cpus_read_lock(); 2812 err = _virtnet_set_queues(vi, queue_pairs); 2813 if (err) { 2814 cpus_read_unlock(); 2815 goto err; 2816 } 2817 virtnet_set_affinity(vi); 2818 cpus_read_unlock(); 2819 2820 netif_set_real_num_tx_queues(dev, queue_pairs); 2821 netif_set_real_num_rx_queues(dev, queue_pairs); 2822 err: 2823 return err; 2824 } 2825 2826 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2827 { 2828 struct virtnet_info *vi = netdev_priv(dev); 2829 unsigned int i, j; 2830 u8 *p = data; 2831 2832 switch (stringset) { 2833 case ETH_SS_STATS: 2834 for (i = 0; i < vi->curr_queue_pairs; i++) { 2835 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) 2836 ethtool_sprintf(&p, "rx_queue_%u_%s", i, 2837 virtnet_rq_stats_desc[j].desc); 2838 } 2839 2840 for (i = 0; i < vi->curr_queue_pairs; i++) { 2841 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) 2842 ethtool_sprintf(&p, "tx_queue_%u_%s", i, 2843 virtnet_sq_stats_desc[j].desc); 2844 } 2845 break; 2846 } 2847 } 2848 2849 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2850 { 2851 struct virtnet_info *vi = netdev_priv(dev); 2852 2853 switch (sset) { 2854 case ETH_SS_STATS: 2855 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2856 VIRTNET_SQ_STATS_LEN); 2857 default: 2858 return -EOPNOTSUPP; 2859 } 2860 } 2861 2862 static void virtnet_get_ethtool_stats(struct net_device *dev, 2863 struct ethtool_stats *stats, u64 *data) 2864 { 2865 struct virtnet_info *vi = netdev_priv(dev); 2866 unsigned int idx = 0, start, i, j; 2867 const u8 *stats_base; 2868 size_t offset; 2869 2870 for (i = 0; i < vi->curr_queue_pairs; i++) { 2871 struct receive_queue *rq = &vi->rq[i]; 2872 2873 stats_base = (u8 *)&rq->stats; 2874 do { 2875 start = u64_stats_fetch_begin(&rq->stats.syncp); 2876 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2877 offset = virtnet_rq_stats_desc[j].offset; 2878 data[idx + j] = *(u64 *)(stats_base + offset); 2879 } 2880 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2881 idx += VIRTNET_RQ_STATS_LEN; 2882 } 2883 2884 for (i = 0; i < vi->curr_queue_pairs; i++) { 2885 struct send_queue *sq = &vi->sq[i]; 2886 2887 stats_base = (u8 *)&sq->stats; 2888 do { 2889 start = u64_stats_fetch_begin(&sq->stats.syncp); 2890 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2891 offset = virtnet_sq_stats_desc[j].offset; 2892 data[idx + j] = *(u64 *)(stats_base + offset); 2893 } 2894 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2895 idx += VIRTNET_SQ_STATS_LEN; 2896 } 2897 } 2898 2899 static void virtnet_get_channels(struct net_device *dev, 2900 struct ethtool_channels *channels) 2901 { 2902 struct virtnet_info *vi = netdev_priv(dev); 2903 2904 channels->combined_count = vi->curr_queue_pairs; 2905 channels->max_combined = vi->max_queue_pairs; 2906 channels->max_other = 0; 2907 channels->rx_count = 0; 2908 channels->tx_count = 0; 2909 channels->other_count = 0; 2910 } 2911 2912 static int virtnet_set_link_ksettings(struct net_device *dev, 2913 const struct ethtool_link_ksettings *cmd) 2914 { 2915 struct virtnet_info *vi = netdev_priv(dev); 2916 2917 return ethtool_virtdev_set_link_ksettings(dev, cmd, 2918 &vi->speed, &vi->duplex); 2919 } 2920 2921 static int virtnet_get_link_ksettings(struct net_device *dev, 2922 struct ethtool_link_ksettings *cmd) 2923 { 2924 struct virtnet_info *vi = netdev_priv(dev); 2925 2926 cmd->base.speed = vi->speed; 2927 cmd->base.duplex = vi->duplex; 2928 cmd->base.port = PORT_OTHER; 2929 2930 return 0; 2931 } 2932 2933 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi, 2934 struct ethtool_coalesce *ec) 2935 { 2936 struct scatterlist sgs_tx, sgs_rx; 2937 struct virtio_net_ctrl_coal_tx coal_tx; 2938 struct virtio_net_ctrl_coal_rx coal_rx; 2939 2940 coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs); 2941 coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames); 2942 sg_init_one(&sgs_tx, &coal_tx, sizeof(coal_tx)); 2943 2944 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2945 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET, 2946 &sgs_tx)) 2947 return -EINVAL; 2948 2949 /* Save parameters */ 2950 vi->tx_usecs = ec->tx_coalesce_usecs; 2951 vi->tx_max_packets = ec->tx_max_coalesced_frames; 2952 2953 coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); 2954 coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); 2955 sg_init_one(&sgs_rx, &coal_rx, sizeof(coal_rx)); 2956 2957 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2958 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, 2959 &sgs_rx)) 2960 return -EINVAL; 2961 2962 /* Save parameters */ 2963 vi->rx_usecs = ec->rx_coalesce_usecs; 2964 vi->rx_max_packets = ec->rx_max_coalesced_frames; 2965 2966 return 0; 2967 } 2968 2969 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec) 2970 { 2971 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL 2972 * feature is negotiated. 2973 */ 2974 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs) 2975 return -EOPNOTSUPP; 2976 2977 if (ec->tx_max_coalesced_frames > 1 || 2978 ec->rx_max_coalesced_frames != 1) 2979 return -EINVAL; 2980 2981 return 0; 2982 } 2983 2984 static int virtnet_set_coalesce(struct net_device *dev, 2985 struct ethtool_coalesce *ec, 2986 struct kernel_ethtool_coalesce *kernel_coal, 2987 struct netlink_ext_ack *extack) 2988 { 2989 struct virtnet_info *vi = netdev_priv(dev); 2990 int ret, i, napi_weight; 2991 bool update_napi = false; 2992 2993 /* Can't change NAPI weight if the link is up */ 2994 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 2995 if (napi_weight ^ vi->sq[0].napi.weight) { 2996 if (dev->flags & IFF_UP) 2997 return -EBUSY; 2998 else 2999 update_napi = true; 3000 } 3001 3002 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) 3003 ret = virtnet_send_notf_coal_cmds(vi, ec); 3004 else 3005 ret = virtnet_coal_params_supported(ec); 3006 3007 if (ret) 3008 return ret; 3009 3010 if (update_napi) { 3011 for (i = 0; i < vi->max_queue_pairs; i++) 3012 vi->sq[i].napi.weight = napi_weight; 3013 } 3014 3015 return ret; 3016 } 3017 3018 static int virtnet_get_coalesce(struct net_device *dev, 3019 struct ethtool_coalesce *ec, 3020 struct kernel_ethtool_coalesce *kernel_coal, 3021 struct netlink_ext_ack *extack) 3022 { 3023 struct virtnet_info *vi = netdev_priv(dev); 3024 3025 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 3026 ec->rx_coalesce_usecs = vi->rx_usecs; 3027 ec->tx_coalesce_usecs = vi->tx_usecs; 3028 ec->tx_max_coalesced_frames = vi->tx_max_packets; 3029 ec->rx_max_coalesced_frames = vi->rx_max_packets; 3030 } else { 3031 ec->rx_max_coalesced_frames = 1; 3032 3033 if (vi->sq[0].napi.weight) 3034 ec->tx_max_coalesced_frames = 1; 3035 } 3036 3037 return 0; 3038 } 3039 3040 static void virtnet_init_settings(struct net_device *dev) 3041 { 3042 struct virtnet_info *vi = netdev_priv(dev); 3043 3044 vi->speed = SPEED_UNKNOWN; 3045 vi->duplex = DUPLEX_UNKNOWN; 3046 } 3047 3048 static void virtnet_update_settings(struct virtnet_info *vi) 3049 { 3050 u32 speed; 3051 u8 duplex; 3052 3053 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 3054 return; 3055 3056 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); 3057 3058 if (ethtool_validate_speed(speed)) 3059 vi->speed = speed; 3060 3061 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); 3062 3063 if (ethtool_validate_duplex(duplex)) 3064 vi->duplex = duplex; 3065 } 3066 3067 static u32 virtnet_get_rxfh_key_size(struct net_device *dev) 3068 { 3069 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; 3070 } 3071 3072 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) 3073 { 3074 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; 3075 } 3076 3077 static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) 3078 { 3079 struct virtnet_info *vi = netdev_priv(dev); 3080 int i; 3081 3082 if (indir) { 3083 for (i = 0; i < vi->rss_indir_table_size; ++i) 3084 indir[i] = vi->ctrl->rss.indirection_table[i]; 3085 } 3086 3087 if (key) 3088 memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); 3089 3090 if (hfunc) 3091 *hfunc = ETH_RSS_HASH_TOP; 3092 3093 return 0; 3094 } 3095 3096 static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) 3097 { 3098 struct virtnet_info *vi = netdev_priv(dev); 3099 int i; 3100 3101 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) 3102 return -EOPNOTSUPP; 3103 3104 if (indir) { 3105 for (i = 0; i < vi->rss_indir_table_size; ++i) 3106 vi->ctrl->rss.indirection_table[i] = indir[i]; 3107 } 3108 if (key) 3109 memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); 3110 3111 virtnet_commit_rss_command(vi); 3112 3113 return 0; 3114 } 3115 3116 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) 3117 { 3118 struct virtnet_info *vi = netdev_priv(dev); 3119 int rc = 0; 3120 3121 switch (info->cmd) { 3122 case ETHTOOL_GRXRINGS: 3123 info->data = vi->curr_queue_pairs; 3124 break; 3125 case ETHTOOL_GRXFH: 3126 virtnet_get_hashflow(vi, info); 3127 break; 3128 default: 3129 rc = -EOPNOTSUPP; 3130 } 3131 3132 return rc; 3133 } 3134 3135 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) 3136 { 3137 struct virtnet_info *vi = netdev_priv(dev); 3138 int rc = 0; 3139 3140 switch (info->cmd) { 3141 case ETHTOOL_SRXFH: 3142 if (!virtnet_set_hashflow(vi, info)) 3143 rc = -EINVAL; 3144 3145 break; 3146 default: 3147 rc = -EOPNOTSUPP; 3148 } 3149 3150 return rc; 3151 } 3152 3153 static const struct ethtool_ops virtnet_ethtool_ops = { 3154 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | 3155 ETHTOOL_COALESCE_USECS, 3156 .get_drvinfo = virtnet_get_drvinfo, 3157 .get_link = ethtool_op_get_link, 3158 .get_ringparam = virtnet_get_ringparam, 3159 .set_ringparam = virtnet_set_ringparam, 3160 .get_strings = virtnet_get_strings, 3161 .get_sset_count = virtnet_get_sset_count, 3162 .get_ethtool_stats = virtnet_get_ethtool_stats, 3163 .set_channels = virtnet_set_channels, 3164 .get_channels = virtnet_get_channels, 3165 .get_ts_info = ethtool_op_get_ts_info, 3166 .get_link_ksettings = virtnet_get_link_ksettings, 3167 .set_link_ksettings = virtnet_set_link_ksettings, 3168 .set_coalesce = virtnet_set_coalesce, 3169 .get_coalesce = virtnet_get_coalesce, 3170 .get_rxfh_key_size = virtnet_get_rxfh_key_size, 3171 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, 3172 .get_rxfh = virtnet_get_rxfh, 3173 .set_rxfh = virtnet_set_rxfh, 3174 .get_rxnfc = virtnet_get_rxnfc, 3175 .set_rxnfc = virtnet_set_rxnfc, 3176 }; 3177 3178 static void virtnet_freeze_down(struct virtio_device *vdev) 3179 { 3180 struct virtnet_info *vi = vdev->priv; 3181 3182 /* Make sure no work handler is accessing the device */ 3183 flush_work(&vi->config_work); 3184 3185 netif_tx_lock_bh(vi->dev); 3186 netif_device_detach(vi->dev); 3187 netif_tx_unlock_bh(vi->dev); 3188 if (netif_running(vi->dev)) 3189 virtnet_close(vi->dev); 3190 } 3191 3192 static int init_vqs(struct virtnet_info *vi); 3193 3194 static int virtnet_restore_up(struct virtio_device *vdev) 3195 { 3196 struct virtnet_info *vi = vdev->priv; 3197 int err; 3198 3199 err = init_vqs(vi); 3200 if (err) 3201 return err; 3202 3203 virtio_device_ready(vdev); 3204 3205 enable_delayed_refill(vi); 3206 3207 if (netif_running(vi->dev)) { 3208 err = virtnet_open(vi->dev); 3209 if (err) 3210 return err; 3211 } 3212 3213 netif_tx_lock_bh(vi->dev); 3214 netif_device_attach(vi->dev); 3215 netif_tx_unlock_bh(vi->dev); 3216 return err; 3217 } 3218 3219 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 3220 { 3221 struct scatterlist sg; 3222 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 3223 3224 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 3225 3226 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 3227 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 3228 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); 3229 return -EINVAL; 3230 } 3231 3232 return 0; 3233 } 3234 3235 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 3236 { 3237 u64 offloads = 0; 3238 3239 if (!vi->guest_offloads) 3240 return 0; 3241 3242 return virtnet_set_guest_offloads(vi, offloads); 3243 } 3244 3245 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 3246 { 3247 u64 offloads = vi->guest_offloads; 3248 3249 if (!vi->guest_offloads) 3250 return 0; 3251 3252 return virtnet_set_guest_offloads(vi, offloads); 3253 } 3254 3255 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 3256 struct netlink_ext_ack *extack) 3257 { 3258 unsigned int room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 3259 sizeof(struct skb_shared_info)); 3260 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN; 3261 struct virtnet_info *vi = netdev_priv(dev); 3262 struct bpf_prog *old_prog; 3263 u16 xdp_qp = 0, curr_qp; 3264 int i, err; 3265 3266 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 3267 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3268 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3269 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3270 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3271 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) || 3272 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) || 3273 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) { 3274 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first"); 3275 return -EOPNOTSUPP; 3276 } 3277 3278 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 3279 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 3280 return -EINVAL; 3281 } 3282 3283 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) { 3284 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags"); 3285 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz); 3286 return -EINVAL; 3287 } 3288 3289 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 3290 if (prog) 3291 xdp_qp = nr_cpu_ids; 3292 3293 /* XDP requires extra queues for XDP_TX */ 3294 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 3295 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", 3296 curr_qp + xdp_qp, vi->max_queue_pairs); 3297 xdp_qp = 0; 3298 } 3299 3300 old_prog = rtnl_dereference(vi->rq[0].xdp_prog); 3301 if (!prog && !old_prog) 3302 return 0; 3303 3304 if (prog) 3305 bpf_prog_add(prog, vi->max_queue_pairs - 1); 3306 3307 /* Make sure NAPI is not using any XDP TX queues for RX. */ 3308 if (netif_running(dev)) { 3309 for (i = 0; i < vi->max_queue_pairs; i++) { 3310 napi_disable(&vi->rq[i].napi); 3311 virtnet_napi_tx_disable(&vi->sq[i].napi); 3312 } 3313 } 3314 3315 if (!prog) { 3316 for (i = 0; i < vi->max_queue_pairs; i++) { 3317 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3318 if (i == 0) 3319 virtnet_restore_guest_offloads(vi); 3320 } 3321 synchronize_net(); 3322 } 3323 3324 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 3325 if (err) 3326 goto err; 3327 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 3328 vi->xdp_queue_pairs = xdp_qp; 3329 3330 if (prog) { 3331 vi->xdp_enabled = true; 3332 for (i = 0; i < vi->max_queue_pairs; i++) { 3333 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3334 if (i == 0 && !old_prog) 3335 virtnet_clear_guest_offloads(vi); 3336 } 3337 if (!old_prog) 3338 xdp_features_set_redirect_target(dev, true); 3339 } else { 3340 xdp_features_clear_redirect_target(dev); 3341 vi->xdp_enabled = false; 3342 } 3343 3344 for (i = 0; i < vi->max_queue_pairs; i++) { 3345 if (old_prog) 3346 bpf_prog_put(old_prog); 3347 if (netif_running(dev)) { 3348 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3349 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3350 &vi->sq[i].napi); 3351 } 3352 } 3353 3354 return 0; 3355 3356 err: 3357 if (!prog) { 3358 virtnet_clear_guest_offloads(vi); 3359 for (i = 0; i < vi->max_queue_pairs; i++) 3360 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); 3361 } 3362 3363 if (netif_running(dev)) { 3364 for (i = 0; i < vi->max_queue_pairs; i++) { 3365 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3366 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3367 &vi->sq[i].napi); 3368 } 3369 } 3370 if (prog) 3371 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 3372 return err; 3373 } 3374 3375 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 3376 { 3377 switch (xdp->command) { 3378 case XDP_SETUP_PROG: 3379 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 3380 default: 3381 return -EINVAL; 3382 } 3383 } 3384 3385 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 3386 size_t len) 3387 { 3388 struct virtnet_info *vi = netdev_priv(dev); 3389 int ret; 3390 3391 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 3392 return -EOPNOTSUPP; 3393 3394 ret = snprintf(buf, len, "sby"); 3395 if (ret >= len) 3396 return -EOPNOTSUPP; 3397 3398 return 0; 3399 } 3400 3401 static int virtnet_set_features(struct net_device *dev, 3402 netdev_features_t features) 3403 { 3404 struct virtnet_info *vi = netdev_priv(dev); 3405 u64 offloads; 3406 int err; 3407 3408 if ((dev->features ^ features) & NETIF_F_GRO_HW) { 3409 if (vi->xdp_enabled) 3410 return -EBUSY; 3411 3412 if (features & NETIF_F_GRO_HW) 3413 offloads = vi->guest_offloads_capable; 3414 else 3415 offloads = vi->guest_offloads_capable & 3416 ~GUEST_OFFLOAD_GRO_HW_MASK; 3417 3418 err = virtnet_set_guest_offloads(vi, offloads); 3419 if (err) 3420 return err; 3421 vi->guest_offloads = offloads; 3422 } 3423 3424 if ((dev->features ^ features) & NETIF_F_RXHASH) { 3425 if (features & NETIF_F_RXHASH) 3426 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 3427 else 3428 vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; 3429 3430 if (!virtnet_commit_rss_command(vi)) 3431 return -EINVAL; 3432 } 3433 3434 return 0; 3435 } 3436 3437 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue) 3438 { 3439 struct virtnet_info *priv = netdev_priv(dev); 3440 struct send_queue *sq = &priv->sq[txqueue]; 3441 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue); 3442 3443 u64_stats_update_begin(&sq->stats.syncp); 3444 sq->stats.tx_timeouts++; 3445 u64_stats_update_end(&sq->stats.syncp); 3446 3447 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n", 3448 txqueue, sq->name, sq->vq->index, sq->vq->name, 3449 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start))); 3450 } 3451 3452 static const struct net_device_ops virtnet_netdev = { 3453 .ndo_open = virtnet_open, 3454 .ndo_stop = virtnet_close, 3455 .ndo_start_xmit = start_xmit, 3456 .ndo_validate_addr = eth_validate_addr, 3457 .ndo_set_mac_address = virtnet_set_mac_address, 3458 .ndo_set_rx_mode = virtnet_set_rx_mode, 3459 .ndo_get_stats64 = virtnet_stats, 3460 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 3461 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 3462 .ndo_bpf = virtnet_xdp, 3463 .ndo_xdp_xmit = virtnet_xdp_xmit, 3464 .ndo_features_check = passthru_features_check, 3465 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 3466 .ndo_set_features = virtnet_set_features, 3467 .ndo_tx_timeout = virtnet_tx_timeout, 3468 }; 3469 3470 static void virtnet_config_changed_work(struct work_struct *work) 3471 { 3472 struct virtnet_info *vi = 3473 container_of(work, struct virtnet_info, config_work); 3474 u16 v; 3475 3476 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 3477 struct virtio_net_config, status, &v) < 0) 3478 return; 3479 3480 if (v & VIRTIO_NET_S_ANNOUNCE) { 3481 netdev_notify_peers(vi->dev); 3482 virtnet_ack_link_announce(vi); 3483 } 3484 3485 /* Ignore unknown (future) status bits */ 3486 v &= VIRTIO_NET_S_LINK_UP; 3487 3488 if (vi->status == v) 3489 return; 3490 3491 vi->status = v; 3492 3493 if (vi->status & VIRTIO_NET_S_LINK_UP) { 3494 virtnet_update_settings(vi); 3495 netif_carrier_on(vi->dev); 3496 netif_tx_wake_all_queues(vi->dev); 3497 } else { 3498 netif_carrier_off(vi->dev); 3499 netif_tx_stop_all_queues(vi->dev); 3500 } 3501 } 3502 3503 static void virtnet_config_changed(struct virtio_device *vdev) 3504 { 3505 struct virtnet_info *vi = vdev->priv; 3506 3507 schedule_work(&vi->config_work); 3508 } 3509 3510 static void virtnet_free_queues(struct virtnet_info *vi) 3511 { 3512 int i; 3513 3514 for (i = 0; i < vi->max_queue_pairs; i++) { 3515 __netif_napi_del(&vi->rq[i].napi); 3516 __netif_napi_del(&vi->sq[i].napi); 3517 } 3518 3519 /* We called __netif_napi_del(), 3520 * we need to respect an RCU grace period before freeing vi->rq 3521 */ 3522 synchronize_net(); 3523 3524 kfree(vi->rq); 3525 kfree(vi->sq); 3526 kfree(vi->ctrl); 3527 } 3528 3529 static void _free_receive_bufs(struct virtnet_info *vi) 3530 { 3531 struct bpf_prog *old_prog; 3532 int i; 3533 3534 for (i = 0; i < vi->max_queue_pairs; i++) { 3535 while (vi->rq[i].pages) 3536 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 3537 3538 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 3539 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 3540 if (old_prog) 3541 bpf_prog_put(old_prog); 3542 } 3543 } 3544 3545 static void free_receive_bufs(struct virtnet_info *vi) 3546 { 3547 rtnl_lock(); 3548 _free_receive_bufs(vi); 3549 rtnl_unlock(); 3550 } 3551 3552 static void free_receive_page_frags(struct virtnet_info *vi) 3553 { 3554 int i; 3555 for (i = 0; i < vi->max_queue_pairs; i++) 3556 if (vi->rq[i].alloc_frag.page) 3557 put_page(vi->rq[i].alloc_frag.page); 3558 } 3559 3560 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) 3561 { 3562 if (!is_xdp_frame(buf)) 3563 dev_kfree_skb(buf); 3564 else 3565 xdp_return_frame(ptr_to_xdp(buf)); 3566 } 3567 3568 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf) 3569 { 3570 struct virtnet_info *vi = vq->vdev->priv; 3571 int i = vq2rxq(vq); 3572 3573 if (vi->mergeable_rx_bufs) 3574 put_page(virt_to_head_page(buf)); 3575 else if (vi->big_packets) 3576 give_pages(&vi->rq[i], buf); 3577 else 3578 put_page(virt_to_head_page(buf)); 3579 } 3580 3581 static void free_unused_bufs(struct virtnet_info *vi) 3582 { 3583 void *buf; 3584 int i; 3585 3586 for (i = 0; i < vi->max_queue_pairs; i++) { 3587 struct virtqueue *vq = vi->sq[i].vq; 3588 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3589 virtnet_sq_free_unused_buf(vq, buf); 3590 cond_resched(); 3591 } 3592 3593 for (i = 0; i < vi->max_queue_pairs; i++) { 3594 struct virtqueue *vq = vi->rq[i].vq; 3595 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3596 virtnet_rq_free_unused_buf(vq, buf); 3597 cond_resched(); 3598 } 3599 } 3600 3601 static void virtnet_del_vqs(struct virtnet_info *vi) 3602 { 3603 struct virtio_device *vdev = vi->vdev; 3604 3605 virtnet_clean_affinity(vi); 3606 3607 vdev->config->del_vqs(vdev); 3608 3609 virtnet_free_queues(vi); 3610 } 3611 3612 /* How large should a single buffer be so a queue full of these can fit at 3613 * least one full packet? 3614 * Logic below assumes the mergeable buffer header is used. 3615 */ 3616 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 3617 { 3618 const unsigned int hdr_len = vi->hdr_len; 3619 unsigned int rq_size = virtqueue_get_vring_size(vq); 3620 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 3621 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 3622 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 3623 3624 return max(max(min_buf_len, hdr_len) - hdr_len, 3625 (unsigned int)GOOD_PACKET_LEN); 3626 } 3627 3628 static int virtnet_find_vqs(struct virtnet_info *vi) 3629 { 3630 vq_callback_t **callbacks; 3631 struct virtqueue **vqs; 3632 int ret = -ENOMEM; 3633 int i, total_vqs; 3634 const char **names; 3635 bool *ctx; 3636 3637 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 3638 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 3639 * possible control vq. 3640 */ 3641 total_vqs = vi->max_queue_pairs * 2 + 3642 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 3643 3644 /* Allocate space for find_vqs parameters */ 3645 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 3646 if (!vqs) 3647 goto err_vq; 3648 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 3649 if (!callbacks) 3650 goto err_callback; 3651 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 3652 if (!names) 3653 goto err_names; 3654 if (!vi->big_packets || vi->mergeable_rx_bufs) { 3655 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 3656 if (!ctx) 3657 goto err_ctx; 3658 } else { 3659 ctx = NULL; 3660 } 3661 3662 /* Parameters for control virtqueue, if any */ 3663 if (vi->has_cvq) { 3664 callbacks[total_vqs - 1] = NULL; 3665 names[total_vqs - 1] = "control"; 3666 } 3667 3668 /* Allocate/initialize parameters for send/receive virtqueues */ 3669 for (i = 0; i < vi->max_queue_pairs; i++) { 3670 callbacks[rxq2vq(i)] = skb_recv_done; 3671 callbacks[txq2vq(i)] = skb_xmit_done; 3672 sprintf(vi->rq[i].name, "input.%d", i); 3673 sprintf(vi->sq[i].name, "output.%d", i); 3674 names[rxq2vq(i)] = vi->rq[i].name; 3675 names[txq2vq(i)] = vi->sq[i].name; 3676 if (ctx) 3677 ctx[rxq2vq(i)] = true; 3678 } 3679 3680 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, 3681 names, ctx, NULL); 3682 if (ret) 3683 goto err_find; 3684 3685 if (vi->has_cvq) { 3686 vi->cvq = vqs[total_vqs - 1]; 3687 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 3688 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 3689 } 3690 3691 for (i = 0; i < vi->max_queue_pairs; i++) { 3692 vi->rq[i].vq = vqs[rxq2vq(i)]; 3693 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 3694 vi->sq[i].vq = vqs[txq2vq(i)]; 3695 } 3696 3697 /* run here: ret == 0. */ 3698 3699 3700 err_find: 3701 kfree(ctx); 3702 err_ctx: 3703 kfree(names); 3704 err_names: 3705 kfree(callbacks); 3706 err_callback: 3707 kfree(vqs); 3708 err_vq: 3709 return ret; 3710 } 3711 3712 static int virtnet_alloc_queues(struct virtnet_info *vi) 3713 { 3714 int i; 3715 3716 if (vi->has_cvq) { 3717 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 3718 if (!vi->ctrl) 3719 goto err_ctrl; 3720 } else { 3721 vi->ctrl = NULL; 3722 } 3723 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 3724 if (!vi->sq) 3725 goto err_sq; 3726 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 3727 if (!vi->rq) 3728 goto err_rq; 3729 3730 INIT_DELAYED_WORK(&vi->refill, refill_work); 3731 for (i = 0; i < vi->max_queue_pairs; i++) { 3732 vi->rq[i].pages = NULL; 3733 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll, 3734 napi_weight); 3735 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi, 3736 virtnet_poll_tx, 3737 napi_tx ? napi_weight : 0); 3738 3739 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 3740 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 3741 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 3742 3743 u64_stats_init(&vi->rq[i].stats.syncp); 3744 u64_stats_init(&vi->sq[i].stats.syncp); 3745 } 3746 3747 return 0; 3748 3749 err_rq: 3750 kfree(vi->sq); 3751 err_sq: 3752 kfree(vi->ctrl); 3753 err_ctrl: 3754 return -ENOMEM; 3755 } 3756 3757 static int init_vqs(struct virtnet_info *vi) 3758 { 3759 int ret; 3760 3761 /* Allocate send & receive queues */ 3762 ret = virtnet_alloc_queues(vi); 3763 if (ret) 3764 goto err; 3765 3766 ret = virtnet_find_vqs(vi); 3767 if (ret) 3768 goto err_free; 3769 3770 cpus_read_lock(); 3771 virtnet_set_affinity(vi); 3772 cpus_read_unlock(); 3773 3774 return 0; 3775 3776 err_free: 3777 virtnet_free_queues(vi); 3778 err: 3779 return ret; 3780 } 3781 3782 #ifdef CONFIG_SYSFS 3783 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 3784 char *buf) 3785 { 3786 struct virtnet_info *vi = netdev_priv(queue->dev); 3787 unsigned int queue_index = get_netdev_rx_queue_index(queue); 3788 unsigned int headroom = virtnet_get_headroom(vi); 3789 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 3790 struct ewma_pkt_len *avg; 3791 3792 BUG_ON(queue_index >= vi->max_queue_pairs); 3793 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 3794 return sprintf(buf, "%u\n", 3795 get_mergeable_buf_len(&vi->rq[queue_index], avg, 3796 SKB_DATA_ALIGN(headroom + tailroom))); 3797 } 3798 3799 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 3800 __ATTR_RO(mergeable_rx_buffer_size); 3801 3802 static struct attribute *virtio_net_mrg_rx_attrs[] = { 3803 &mergeable_rx_buffer_size_attribute.attr, 3804 NULL 3805 }; 3806 3807 static const struct attribute_group virtio_net_mrg_rx_group = { 3808 .name = "virtio_net", 3809 .attrs = virtio_net_mrg_rx_attrs 3810 }; 3811 #endif 3812 3813 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 3814 unsigned int fbit, 3815 const char *fname, const char *dname) 3816 { 3817 if (!virtio_has_feature(vdev, fbit)) 3818 return false; 3819 3820 dev_err(&vdev->dev, "device advertises feature %s but not %s", 3821 fname, dname); 3822 3823 return true; 3824 } 3825 3826 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 3827 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 3828 3829 static bool virtnet_validate_features(struct virtio_device *vdev) 3830 { 3831 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 3832 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 3833 "VIRTIO_NET_F_CTRL_VQ") || 3834 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 3835 "VIRTIO_NET_F_CTRL_VQ") || 3836 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 3837 "VIRTIO_NET_F_CTRL_VQ") || 3838 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 3839 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 3840 "VIRTIO_NET_F_CTRL_VQ") || 3841 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, 3842 "VIRTIO_NET_F_CTRL_VQ") || 3843 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT, 3844 "VIRTIO_NET_F_CTRL_VQ") || 3845 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL, 3846 "VIRTIO_NET_F_CTRL_VQ"))) { 3847 return false; 3848 } 3849 3850 return true; 3851 } 3852 3853 #define MIN_MTU ETH_MIN_MTU 3854 #define MAX_MTU ETH_MAX_MTU 3855 3856 static int virtnet_validate(struct virtio_device *vdev) 3857 { 3858 if (!vdev->config->get) { 3859 dev_err(&vdev->dev, "%s failure: config access disabled\n", 3860 __func__); 3861 return -EINVAL; 3862 } 3863 3864 if (!virtnet_validate_features(vdev)) 3865 return -EINVAL; 3866 3867 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3868 int mtu = virtio_cread16(vdev, 3869 offsetof(struct virtio_net_config, 3870 mtu)); 3871 if (mtu < MIN_MTU) 3872 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 3873 } 3874 3875 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) && 3876 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3877 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby"); 3878 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY); 3879 } 3880 3881 return 0; 3882 } 3883 3884 static bool virtnet_check_guest_gso(const struct virtnet_info *vi) 3885 { 3886 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3887 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3888 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3889 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3890 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) && 3891 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6)); 3892 } 3893 3894 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu) 3895 { 3896 bool guest_gso = virtnet_check_guest_gso(vi); 3897 3898 /* If device can receive ANY guest GSO packets, regardless of mtu, 3899 * allocate packets of maximum size, otherwise limit it to only 3900 * mtu size worth only. 3901 */ 3902 if (mtu > ETH_DATA_LEN || guest_gso) { 3903 vi->big_packets = true; 3904 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE); 3905 } 3906 } 3907 3908 static int virtnet_probe(struct virtio_device *vdev) 3909 { 3910 int i, err = -ENOMEM; 3911 struct net_device *dev; 3912 struct virtnet_info *vi; 3913 u16 max_queue_pairs; 3914 int mtu = 0; 3915 3916 /* Find if host supports multiqueue/rss virtio_net device */ 3917 max_queue_pairs = 1; 3918 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 3919 max_queue_pairs = 3920 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs)); 3921 3922 /* We need at least 2 queue's */ 3923 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 3924 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 3925 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 3926 max_queue_pairs = 1; 3927 3928 /* Allocate ourselves a network device with room for our info */ 3929 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 3930 if (!dev) 3931 return -ENOMEM; 3932 3933 /* Set up network device as normal. */ 3934 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE | 3935 IFF_TX_SKB_NO_LINEAR; 3936 dev->netdev_ops = &virtnet_netdev; 3937 dev->features = NETIF_F_HIGHDMA; 3938 3939 dev->ethtool_ops = &virtnet_ethtool_ops; 3940 SET_NETDEV_DEV(dev, &vdev->dev); 3941 3942 /* Do we support "hardware" checksums? */ 3943 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 3944 /* This opens up the world of extra features. */ 3945 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3946 if (csum) 3947 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3948 3949 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 3950 dev->hw_features |= NETIF_F_TSO 3951 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 3952 } 3953 /* Individual feature bits: what can host handle? */ 3954 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 3955 dev->hw_features |= NETIF_F_TSO; 3956 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 3957 dev->hw_features |= NETIF_F_TSO6; 3958 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 3959 dev->hw_features |= NETIF_F_TSO_ECN; 3960 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO)) 3961 dev->hw_features |= NETIF_F_GSO_UDP_L4; 3962 3963 dev->features |= NETIF_F_GSO_ROBUST; 3964 3965 if (gso) 3966 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 3967 /* (!csum && gso) case will be fixed by register_netdev() */ 3968 } 3969 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 3970 dev->features |= NETIF_F_RXCSUM; 3971 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3972 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 3973 dev->features |= NETIF_F_GRO_HW; 3974 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 3975 dev->hw_features |= NETIF_F_GRO_HW; 3976 3977 dev->vlan_features = dev->features; 3978 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT; 3979 3980 /* MTU range: 68 - 65535 */ 3981 dev->min_mtu = MIN_MTU; 3982 dev->max_mtu = MAX_MTU; 3983 3984 /* Configuration may specify what MAC to use. Otherwise random. */ 3985 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3986 u8 addr[ETH_ALEN]; 3987 3988 virtio_cread_bytes(vdev, 3989 offsetof(struct virtio_net_config, mac), 3990 addr, ETH_ALEN); 3991 eth_hw_addr_set(dev, addr); 3992 } else { 3993 eth_hw_addr_random(dev); 3994 dev_info(&vdev->dev, "Assigned random MAC address %pM\n", 3995 dev->dev_addr); 3996 } 3997 3998 /* Set up our device-specific information */ 3999 vi = netdev_priv(dev); 4000 vi->dev = dev; 4001 vi->vdev = vdev; 4002 vdev->priv = vi; 4003 4004 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 4005 spin_lock_init(&vi->refill_lock); 4006 4007 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { 4008 vi->mergeable_rx_bufs = true; 4009 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG; 4010 } 4011 4012 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 4013 vi->rx_usecs = 0; 4014 vi->tx_usecs = 0; 4015 vi->tx_max_packets = 0; 4016 vi->rx_max_packets = 0; 4017 } 4018 4019 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) 4020 vi->has_rss_hash_report = true; 4021 4022 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 4023 vi->has_rss = true; 4024 4025 if (vi->has_rss || vi->has_rss_hash_report) { 4026 vi->rss_indir_table_size = 4027 virtio_cread16(vdev, offsetof(struct virtio_net_config, 4028 rss_max_indirection_table_length)); 4029 vi->rss_key_size = 4030 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); 4031 4032 vi->rss_hash_types_supported = 4033 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); 4034 vi->rss_hash_types_supported &= 4035 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | 4036 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | 4037 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); 4038 4039 dev->hw_features |= NETIF_F_RXHASH; 4040 } 4041 4042 if (vi->has_rss_hash_report) 4043 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash); 4044 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 4045 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4046 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 4047 else 4048 vi->hdr_len = sizeof(struct virtio_net_hdr); 4049 4050 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 4051 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4052 vi->any_header_sg = true; 4053 4054 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 4055 vi->has_cvq = true; 4056 4057 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 4058 mtu = virtio_cread16(vdev, 4059 offsetof(struct virtio_net_config, 4060 mtu)); 4061 if (mtu < dev->min_mtu) { 4062 /* Should never trigger: MTU was previously validated 4063 * in virtnet_validate. 4064 */ 4065 dev_err(&vdev->dev, 4066 "device MTU appears to have changed it is now %d < %d", 4067 mtu, dev->min_mtu); 4068 err = -EINVAL; 4069 goto free; 4070 } 4071 4072 dev->mtu = mtu; 4073 dev->max_mtu = mtu; 4074 } 4075 4076 virtnet_set_big_packets(vi, mtu); 4077 4078 if (vi->any_header_sg) 4079 dev->needed_headroom = vi->hdr_len; 4080 4081 /* Enable multiqueue by default */ 4082 if (num_online_cpus() >= max_queue_pairs) 4083 vi->curr_queue_pairs = max_queue_pairs; 4084 else 4085 vi->curr_queue_pairs = num_online_cpus(); 4086 vi->max_queue_pairs = max_queue_pairs; 4087 4088 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 4089 err = init_vqs(vi); 4090 if (err) 4091 goto free; 4092 4093 #ifdef CONFIG_SYSFS 4094 if (vi->mergeable_rx_bufs) 4095 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 4096 #endif 4097 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 4098 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 4099 4100 virtnet_init_settings(dev); 4101 4102 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 4103 vi->failover = net_failover_create(vi->dev); 4104 if (IS_ERR(vi->failover)) { 4105 err = PTR_ERR(vi->failover); 4106 goto free_vqs; 4107 } 4108 } 4109 4110 if (vi->has_rss || vi->has_rss_hash_report) 4111 virtnet_init_default_rss(vi); 4112 4113 /* serialize netdev register + virtio_device_ready() with ndo_open() */ 4114 rtnl_lock(); 4115 4116 err = register_netdevice(dev); 4117 if (err) { 4118 pr_debug("virtio_net: registering device failed\n"); 4119 rtnl_unlock(); 4120 goto free_failover; 4121 } 4122 4123 virtio_device_ready(vdev); 4124 4125 /* a random MAC address has been assigned, notify the device. 4126 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there 4127 * because many devices work fine without getting MAC explicitly 4128 */ 4129 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 4130 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 4131 struct scatterlist sg; 4132 4133 sg_init_one(&sg, dev->dev_addr, dev->addr_len); 4134 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 4135 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 4136 pr_debug("virtio_net: setting MAC address failed\n"); 4137 rtnl_unlock(); 4138 err = -EINVAL; 4139 goto free_unregister_netdev; 4140 } 4141 } 4142 4143 rtnl_unlock(); 4144 4145 err = virtnet_cpu_notif_add(vi); 4146 if (err) { 4147 pr_debug("virtio_net: registering cpu notifier failed\n"); 4148 goto free_unregister_netdev; 4149 } 4150 4151 virtnet_set_queues(vi, vi->curr_queue_pairs); 4152 4153 /* Assume link up if device can't report link status, 4154 otherwise get link status from config. */ 4155 netif_carrier_off(dev); 4156 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 4157 schedule_work(&vi->config_work); 4158 } else { 4159 vi->status = VIRTIO_NET_S_LINK_UP; 4160 virtnet_update_settings(vi); 4161 netif_carrier_on(dev); 4162 } 4163 4164 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 4165 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 4166 set_bit(guest_offloads[i], &vi->guest_offloads); 4167 vi->guest_offloads_capable = vi->guest_offloads; 4168 4169 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 4170 dev->name, max_queue_pairs); 4171 4172 return 0; 4173 4174 free_unregister_netdev: 4175 unregister_netdev(dev); 4176 free_failover: 4177 net_failover_destroy(vi->failover); 4178 free_vqs: 4179 virtio_reset_device(vdev); 4180 cancel_delayed_work_sync(&vi->refill); 4181 free_receive_page_frags(vi); 4182 virtnet_del_vqs(vi); 4183 free: 4184 free_netdev(dev); 4185 return err; 4186 } 4187 4188 static void remove_vq_common(struct virtnet_info *vi) 4189 { 4190 virtio_reset_device(vi->vdev); 4191 4192 /* Free unused buffers in both send and recv, if any. */ 4193 free_unused_bufs(vi); 4194 4195 free_receive_bufs(vi); 4196 4197 free_receive_page_frags(vi); 4198 4199 virtnet_del_vqs(vi); 4200 } 4201 4202 static void virtnet_remove(struct virtio_device *vdev) 4203 { 4204 struct virtnet_info *vi = vdev->priv; 4205 4206 virtnet_cpu_notif_remove(vi); 4207 4208 /* Make sure no work handler is accessing the device. */ 4209 flush_work(&vi->config_work); 4210 4211 unregister_netdev(vi->dev); 4212 4213 net_failover_destroy(vi->failover); 4214 4215 remove_vq_common(vi); 4216 4217 free_netdev(vi->dev); 4218 } 4219 4220 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 4221 { 4222 struct virtnet_info *vi = vdev->priv; 4223 4224 virtnet_cpu_notif_remove(vi); 4225 virtnet_freeze_down(vdev); 4226 remove_vq_common(vi); 4227 4228 return 0; 4229 } 4230 4231 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 4232 { 4233 struct virtnet_info *vi = vdev->priv; 4234 int err; 4235 4236 err = virtnet_restore_up(vdev); 4237 if (err) 4238 return err; 4239 virtnet_set_queues(vi, vi->curr_queue_pairs); 4240 4241 err = virtnet_cpu_notif_add(vi); 4242 if (err) { 4243 virtnet_freeze_down(vdev); 4244 remove_vq_common(vi); 4245 return err; 4246 } 4247 4248 return 0; 4249 } 4250 4251 static struct virtio_device_id id_table[] = { 4252 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 4253 { 0 }, 4254 }; 4255 4256 #define VIRTNET_FEATURES \ 4257 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 4258 VIRTIO_NET_F_MAC, \ 4259 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 4260 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 4261 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 4262 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \ 4263 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 4264 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 4265 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 4266 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 4267 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 4268 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \ 4269 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \ 4270 VIRTIO_NET_F_GUEST_HDRLEN 4271 4272 static unsigned int features[] = { 4273 VIRTNET_FEATURES, 4274 }; 4275 4276 static unsigned int features_legacy[] = { 4277 VIRTNET_FEATURES, 4278 VIRTIO_NET_F_GSO, 4279 VIRTIO_F_ANY_LAYOUT, 4280 }; 4281 4282 static struct virtio_driver virtio_net_driver = { 4283 .feature_table = features, 4284 .feature_table_size = ARRAY_SIZE(features), 4285 .feature_table_legacy = features_legacy, 4286 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 4287 .driver.name = KBUILD_MODNAME, 4288 .driver.owner = THIS_MODULE, 4289 .id_table = id_table, 4290 .validate = virtnet_validate, 4291 .probe = virtnet_probe, 4292 .remove = virtnet_remove, 4293 .config_changed = virtnet_config_changed, 4294 #ifdef CONFIG_PM_SLEEP 4295 .freeze = virtnet_freeze, 4296 .restore = virtnet_restore, 4297 #endif 4298 }; 4299 4300 static __init int virtio_net_driver_init(void) 4301 { 4302 int ret; 4303 4304 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 4305 virtnet_cpu_online, 4306 virtnet_cpu_down_prep); 4307 if (ret < 0) 4308 goto out; 4309 virtionet_online = ret; 4310 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 4311 NULL, virtnet_cpu_dead); 4312 if (ret) 4313 goto err_dead; 4314 ret = register_virtio_driver(&virtio_net_driver); 4315 if (ret) 4316 goto err_virtio; 4317 return 0; 4318 err_virtio: 4319 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4320 err_dead: 4321 cpuhp_remove_multi_state(virtionet_online); 4322 out: 4323 return ret; 4324 } 4325 module_init(virtio_net_driver_init); 4326 4327 static __exit void virtio_net_driver_exit(void) 4328 { 4329 unregister_virtio_driver(&virtio_net_driver); 4330 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4331 cpuhp_remove_multi_state(virtionet_online); 4332 } 4333 module_exit(virtio_net_driver_exit); 4334 4335 MODULE_DEVICE_TABLE(virtio, id_table); 4336 MODULE_DESCRIPTION("Virtio network driver"); 4337 MODULE_LICENSE("GPL"); 4338