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 void put_xdp_frags(struct xdp_buff *xdp) 793 { 794 struct skb_shared_info *shinfo; 795 struct page *xdp_page; 796 int i; 797 798 if (xdp_buff_has_frags(xdp)) { 799 shinfo = xdp_get_shared_info_from_buff(xdp); 800 for (i = 0; i < shinfo->nr_frags; i++) { 801 xdp_page = skb_frag_page(&shinfo->frags[i]); 802 put_page(xdp_page); 803 } 804 } 805 } 806 807 static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp, 808 struct net_device *dev, 809 unsigned int *xdp_xmit, 810 struct virtnet_rq_stats *stats) 811 { 812 struct xdp_frame *xdpf; 813 int err; 814 u32 act; 815 816 act = bpf_prog_run_xdp(xdp_prog, xdp); 817 stats->xdp_packets++; 818 819 switch (act) { 820 case XDP_PASS: 821 return act; 822 823 case XDP_TX: 824 stats->xdp_tx++; 825 xdpf = xdp_convert_buff_to_frame(xdp); 826 if (unlikely(!xdpf)) { 827 netdev_dbg(dev, "convert buff to frame failed for xdp\n"); 828 return XDP_DROP; 829 } 830 831 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 832 if (unlikely(!err)) { 833 xdp_return_frame_rx_napi(xdpf); 834 } else if (unlikely(err < 0)) { 835 trace_xdp_exception(dev, xdp_prog, act); 836 return XDP_DROP; 837 } 838 *xdp_xmit |= VIRTIO_XDP_TX; 839 return act; 840 841 case XDP_REDIRECT: 842 stats->xdp_redirects++; 843 err = xdp_do_redirect(dev, xdp, xdp_prog); 844 if (err) 845 return XDP_DROP; 846 847 *xdp_xmit |= VIRTIO_XDP_REDIR; 848 return act; 849 850 default: 851 bpf_warn_invalid_xdp_action(dev, xdp_prog, act); 852 fallthrough; 853 case XDP_ABORTED: 854 trace_xdp_exception(dev, xdp_prog, act); 855 fallthrough; 856 case XDP_DROP: 857 return XDP_DROP; 858 } 859 } 860 861 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 862 { 863 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0; 864 } 865 866 /* We copy the packet for XDP in the following cases: 867 * 868 * 1) Packet is scattered across multiple rx buffers. 869 * 2) Headroom space is insufficient. 870 * 871 * This is inefficient but it's a temporary condition that 872 * we hit right after XDP is enabled and until queue is refilled 873 * with large buffers with sufficient headroom - so it should affect 874 * at most queue size packets. 875 * Afterwards, the conditions to enable 876 * XDP should preclude the underlying device from sending packets 877 * across multiple buffers (num_buf > 1), and we make sure buffers 878 * have enough headroom. 879 */ 880 static struct page *xdp_linearize_page(struct receive_queue *rq, 881 int *num_buf, 882 struct page *p, 883 int offset, 884 int page_off, 885 unsigned int *len) 886 { 887 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 888 struct page *page; 889 890 if (page_off + *len + tailroom > PAGE_SIZE) 891 return NULL; 892 893 page = alloc_page(GFP_ATOMIC); 894 if (!page) 895 return NULL; 896 897 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 898 page_off += *len; 899 900 while (--*num_buf) { 901 unsigned int buflen; 902 void *buf; 903 int off; 904 905 buf = virtqueue_get_buf(rq->vq, &buflen); 906 if (unlikely(!buf)) 907 goto err_buf; 908 909 p = virt_to_head_page(buf); 910 off = buf - page_address(p); 911 912 /* guard against a misconfigured or uncooperative backend that 913 * is sending packet larger than the MTU. 914 */ 915 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 916 put_page(p); 917 goto err_buf; 918 } 919 920 memcpy(page_address(page) + page_off, 921 page_address(p) + off, buflen); 922 page_off += buflen; 923 put_page(p); 924 } 925 926 /* Headroom does not contribute to packet length */ 927 *len = page_off - VIRTIO_XDP_HEADROOM; 928 return page; 929 err_buf: 930 __free_pages(page, 0); 931 return NULL; 932 } 933 934 static struct sk_buff *receive_small(struct net_device *dev, 935 struct virtnet_info *vi, 936 struct receive_queue *rq, 937 void *buf, void *ctx, 938 unsigned int len, 939 unsigned int *xdp_xmit, 940 struct virtnet_rq_stats *stats) 941 { 942 struct sk_buff *skb; 943 struct bpf_prog *xdp_prog; 944 unsigned int xdp_headroom = (unsigned long)ctx; 945 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 946 unsigned int headroom = vi->hdr_len + header_offset; 947 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 948 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 949 struct page *page = virt_to_head_page(buf); 950 unsigned int delta = 0; 951 struct page *xdp_page; 952 unsigned int metasize = 0; 953 954 len -= vi->hdr_len; 955 stats->bytes += len; 956 957 if (unlikely(len > GOOD_PACKET_LEN)) { 958 pr_debug("%s: rx error: len %u exceeds max size %d\n", 959 dev->name, len, GOOD_PACKET_LEN); 960 dev->stats.rx_length_errors++; 961 goto err; 962 } 963 964 if (likely(!vi->xdp_enabled)) { 965 xdp_prog = NULL; 966 goto skip_xdp; 967 } 968 969 rcu_read_lock(); 970 xdp_prog = rcu_dereference(rq->xdp_prog); 971 if (xdp_prog) { 972 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 973 struct xdp_buff xdp; 974 void *orig_data; 975 u32 act; 976 977 if (unlikely(hdr->hdr.gso_type)) 978 goto err_xdp; 979 980 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 981 int offset = buf - page_address(page) + header_offset; 982 unsigned int tlen = len + vi->hdr_len; 983 int num_buf = 1; 984 985 xdp_headroom = virtnet_get_headroom(vi); 986 header_offset = VIRTNET_RX_PAD + xdp_headroom; 987 headroom = vi->hdr_len + header_offset; 988 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 989 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 990 xdp_page = xdp_linearize_page(rq, &num_buf, page, 991 offset, header_offset, 992 &tlen); 993 if (!xdp_page) 994 goto err_xdp; 995 996 buf = page_address(xdp_page); 997 put_page(page); 998 page = xdp_page; 999 } 1000 1001 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); 1002 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, 1003 xdp_headroom, len, true); 1004 orig_data = xdp.data; 1005 1006 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); 1007 1008 switch (act) { 1009 case XDP_PASS: 1010 /* Recalculate length in case bpf program changed it */ 1011 delta = orig_data - xdp.data; 1012 len = xdp.data_end - xdp.data; 1013 metasize = xdp.data - xdp.data_meta; 1014 break; 1015 case XDP_TX: 1016 case XDP_REDIRECT: 1017 rcu_read_unlock(); 1018 goto xdp_xmit; 1019 default: 1020 goto err_xdp; 1021 } 1022 } 1023 rcu_read_unlock(); 1024 1025 skip_xdp: 1026 skb = build_skb(buf, buflen); 1027 if (!skb) 1028 goto err; 1029 skb_reserve(skb, headroom - delta); 1030 skb_put(skb, len); 1031 if (!xdp_prog) { 1032 buf += header_offset; 1033 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 1034 } /* keep zeroed vnet hdr since XDP is loaded */ 1035 1036 if (metasize) 1037 skb_metadata_set(skb, metasize); 1038 1039 return skb; 1040 1041 err_xdp: 1042 rcu_read_unlock(); 1043 stats->xdp_drops++; 1044 err: 1045 stats->drops++; 1046 put_page(page); 1047 xdp_xmit: 1048 return NULL; 1049 } 1050 1051 static struct sk_buff *receive_big(struct net_device *dev, 1052 struct virtnet_info *vi, 1053 struct receive_queue *rq, 1054 void *buf, 1055 unsigned int len, 1056 struct virtnet_rq_stats *stats) 1057 { 1058 struct page *page = buf; 1059 struct sk_buff *skb = 1060 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0); 1061 1062 stats->bytes += len - vi->hdr_len; 1063 if (unlikely(!skb)) 1064 goto err; 1065 1066 return skb; 1067 1068 err: 1069 stats->drops++; 1070 give_pages(rq, page); 1071 return NULL; 1072 } 1073 1074 static void mergeable_buf_free(struct receive_queue *rq, int num_buf, 1075 struct net_device *dev, 1076 struct virtnet_rq_stats *stats) 1077 { 1078 struct page *page; 1079 void *buf; 1080 int len; 1081 1082 while (num_buf-- > 1) { 1083 buf = virtqueue_get_buf(rq->vq, &len); 1084 if (unlikely(!buf)) { 1085 pr_debug("%s: rx error: %d buffers missing\n", 1086 dev->name, num_buf); 1087 dev->stats.rx_length_errors++; 1088 break; 1089 } 1090 stats->bytes += len; 1091 page = virt_to_head_page(buf); 1092 put_page(page); 1093 } 1094 } 1095 1096 /* Why not use xdp_build_skb_from_frame() ? 1097 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in 1098 * virtio-net there are 2 points that do not match its requirements: 1099 * 1. The size of the prefilled buffer is not fixed before xdp is set. 1100 * 2. xdp_build_skb_from_frame() does more checks that we don't need, 1101 * like eth_type_trans() (which virtio-net does in receive_buf()). 1102 */ 1103 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev, 1104 struct virtnet_info *vi, 1105 struct xdp_buff *xdp, 1106 unsigned int xdp_frags_truesz) 1107 { 1108 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 1109 unsigned int headroom, data_len; 1110 struct sk_buff *skb; 1111 int metasize; 1112 u8 nr_frags; 1113 1114 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 1115 pr_debug("Error building skb as missing reserved tailroom for xdp"); 1116 return NULL; 1117 } 1118 1119 if (unlikely(xdp_buff_has_frags(xdp))) 1120 nr_frags = sinfo->nr_frags; 1121 1122 skb = build_skb(xdp->data_hard_start, xdp->frame_sz); 1123 if (unlikely(!skb)) 1124 return NULL; 1125 1126 headroom = xdp->data - xdp->data_hard_start; 1127 data_len = xdp->data_end - xdp->data; 1128 skb_reserve(skb, headroom); 1129 __skb_put(skb, data_len); 1130 1131 metasize = xdp->data - xdp->data_meta; 1132 metasize = metasize > 0 ? metasize : 0; 1133 if (metasize) 1134 skb_metadata_set(skb, metasize); 1135 1136 if (unlikely(xdp_buff_has_frags(xdp))) 1137 xdp_update_skb_shared_info(skb, nr_frags, 1138 sinfo->xdp_frags_size, 1139 xdp_frags_truesz, 1140 xdp_buff_is_frag_pfmemalloc(xdp)); 1141 1142 return skb; 1143 } 1144 1145 /* TODO: build xdp in big mode */ 1146 static int virtnet_build_xdp_buff_mrg(struct net_device *dev, 1147 struct virtnet_info *vi, 1148 struct receive_queue *rq, 1149 struct xdp_buff *xdp, 1150 void *buf, 1151 unsigned int len, 1152 unsigned int frame_sz, 1153 int *num_buf, 1154 unsigned int *xdp_frags_truesize, 1155 struct virtnet_rq_stats *stats) 1156 { 1157 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1158 unsigned int headroom, tailroom, room; 1159 unsigned int truesize, cur_frag_size; 1160 struct skb_shared_info *shinfo; 1161 unsigned int xdp_frags_truesz = 0; 1162 struct page *page; 1163 skb_frag_t *frag; 1164 int offset; 1165 void *ctx; 1166 1167 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); 1168 xdp_prepare_buff(xdp, buf - VIRTIO_XDP_HEADROOM, 1169 VIRTIO_XDP_HEADROOM + vi->hdr_len, len - vi->hdr_len, true); 1170 1171 if (!*num_buf) 1172 return 0; 1173 1174 if (*num_buf > 1) { 1175 /* If we want to build multi-buffer xdp, we need 1176 * to specify that the flags of xdp_buff have the 1177 * XDP_FLAGS_HAS_FRAG bit. 1178 */ 1179 if (!xdp_buff_has_frags(xdp)) 1180 xdp_buff_set_frags_flag(xdp); 1181 1182 shinfo = xdp_get_shared_info_from_buff(xdp); 1183 shinfo->nr_frags = 0; 1184 shinfo->xdp_frags_size = 0; 1185 } 1186 1187 if (*num_buf > MAX_SKB_FRAGS + 1) 1188 return -EINVAL; 1189 1190 while (--*num_buf > 0) { 1191 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1192 if (unlikely(!buf)) { 1193 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1194 dev->name, *num_buf, 1195 virtio16_to_cpu(vi->vdev, hdr->num_buffers)); 1196 dev->stats.rx_length_errors++; 1197 goto err; 1198 } 1199 1200 stats->bytes += len; 1201 page = virt_to_head_page(buf); 1202 offset = buf - page_address(page); 1203 1204 truesize = mergeable_ctx_to_truesize(ctx); 1205 headroom = mergeable_ctx_to_headroom(ctx); 1206 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1207 room = SKB_DATA_ALIGN(headroom + tailroom); 1208 1209 cur_frag_size = truesize; 1210 xdp_frags_truesz += cur_frag_size; 1211 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) { 1212 put_page(page); 1213 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1214 dev->name, len, (unsigned long)(truesize - room)); 1215 dev->stats.rx_length_errors++; 1216 goto err; 1217 } 1218 1219 frag = &shinfo->frags[shinfo->nr_frags++]; 1220 __skb_frag_set_page(frag, page); 1221 skb_frag_off_set(frag, offset); 1222 skb_frag_size_set(frag, len); 1223 if (page_is_pfmemalloc(page)) 1224 xdp_buff_set_frag_pfmemalloc(xdp); 1225 1226 shinfo->xdp_frags_size += len; 1227 } 1228 1229 *xdp_frags_truesize = xdp_frags_truesz; 1230 return 0; 1231 1232 err: 1233 put_xdp_frags(xdp); 1234 return -EINVAL; 1235 } 1236 1237 static void *mergeable_xdp_get_buf(struct virtnet_info *vi, 1238 struct receive_queue *rq, 1239 struct bpf_prog *xdp_prog, 1240 void *ctx, 1241 unsigned int *frame_sz, 1242 int *num_buf, 1243 struct page **page, 1244 int offset, 1245 unsigned int *len, 1246 struct virtio_net_hdr_mrg_rxbuf *hdr) 1247 { 1248 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1249 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1250 struct page *xdp_page; 1251 unsigned int xdp_room; 1252 1253 /* Transient failure which in theory could occur if 1254 * in-flight packets from before XDP was enabled reach 1255 * the receive path after XDP is loaded. 1256 */ 1257 if (unlikely(hdr->hdr.gso_type)) 1258 return NULL; 1259 1260 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers 1261 * with headroom may add hole in truesize, which 1262 * make their length exceed PAGE_SIZE. So we disabled the 1263 * hole mechanism for xdp. See add_recvbuf_mergeable(). 1264 */ 1265 *frame_sz = truesize; 1266 1267 if (likely(headroom >= virtnet_get_headroom(vi) && 1268 (*num_buf == 1 || xdp_prog->aux->xdp_has_frags))) { 1269 return page_address(*page) + offset; 1270 } 1271 1272 /* This happens when headroom is not enough because 1273 * of the buffer was prefilled before XDP is set. 1274 * This should only happen for the first several packets. 1275 * In fact, vq reset can be used here to help us clean up 1276 * the prefilled buffers, but many existing devices do not 1277 * support it, and we don't want to bother users who are 1278 * using xdp normally. 1279 */ 1280 if (!xdp_prog->aux->xdp_has_frags) { 1281 /* linearize data for XDP */ 1282 xdp_page = xdp_linearize_page(rq, num_buf, 1283 *page, offset, 1284 VIRTIO_XDP_HEADROOM, 1285 len); 1286 if (!xdp_page) 1287 return NULL; 1288 } else { 1289 xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 1290 sizeof(struct skb_shared_info)); 1291 if (*len + xdp_room > PAGE_SIZE) 1292 return NULL; 1293 1294 xdp_page = alloc_page(GFP_ATOMIC); 1295 if (!xdp_page) 1296 return NULL; 1297 1298 memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM, 1299 page_address(*page) + offset, *len); 1300 } 1301 1302 *frame_sz = PAGE_SIZE; 1303 1304 put_page(*page); 1305 1306 *page = xdp_page; 1307 1308 return page_address(*page) + VIRTIO_XDP_HEADROOM; 1309 } 1310 1311 static struct sk_buff *receive_mergeable(struct net_device *dev, 1312 struct virtnet_info *vi, 1313 struct receive_queue *rq, 1314 void *buf, 1315 void *ctx, 1316 unsigned int len, 1317 unsigned int *xdp_xmit, 1318 struct virtnet_rq_stats *stats) 1319 { 1320 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1321 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 1322 struct page *page = virt_to_head_page(buf); 1323 int offset = buf - page_address(page); 1324 struct sk_buff *head_skb, *curr_skb; 1325 struct bpf_prog *xdp_prog; 1326 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1327 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1328 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1329 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1330 unsigned int frame_sz; 1331 int err; 1332 1333 head_skb = NULL; 1334 stats->bytes += len - vi->hdr_len; 1335 1336 if (unlikely(len > truesize - room)) { 1337 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1338 dev->name, len, (unsigned long)(truesize - room)); 1339 dev->stats.rx_length_errors++; 1340 goto err_skb; 1341 } 1342 1343 if (likely(!vi->xdp_enabled)) { 1344 xdp_prog = NULL; 1345 goto skip_xdp; 1346 } 1347 1348 rcu_read_lock(); 1349 xdp_prog = rcu_dereference(rq->xdp_prog); 1350 if (xdp_prog) { 1351 unsigned int xdp_frags_truesz = 0; 1352 struct xdp_buff xdp; 1353 void *data; 1354 u32 act; 1355 1356 data = mergeable_xdp_get_buf(vi, rq, xdp_prog, ctx, &frame_sz, 1357 &num_buf, &page, offset, &len, hdr); 1358 if (unlikely(!data)) 1359 goto err_xdp; 1360 1361 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz, 1362 &num_buf, &xdp_frags_truesz, stats); 1363 if (unlikely(err)) 1364 goto err_xdp; 1365 1366 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); 1367 1368 switch (act) { 1369 case XDP_PASS: 1370 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); 1371 if (unlikely(!head_skb)) 1372 goto err_xdp_frags; 1373 1374 rcu_read_unlock(); 1375 return head_skb; 1376 case XDP_TX: 1377 case XDP_REDIRECT: 1378 rcu_read_unlock(); 1379 goto xdp_xmit; 1380 default: 1381 break; 1382 } 1383 err_xdp_frags: 1384 put_xdp_frags(&xdp); 1385 goto err_xdp; 1386 } 1387 rcu_read_unlock(); 1388 1389 skip_xdp: 1390 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom); 1391 curr_skb = head_skb; 1392 1393 if (unlikely(!curr_skb)) 1394 goto err_skb; 1395 while (--num_buf) { 1396 int num_skb_frags; 1397 1398 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1399 if (unlikely(!buf)) { 1400 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1401 dev->name, num_buf, 1402 virtio16_to_cpu(vi->vdev, 1403 hdr->num_buffers)); 1404 dev->stats.rx_length_errors++; 1405 goto err_buf; 1406 } 1407 1408 stats->bytes += len; 1409 page = virt_to_head_page(buf); 1410 1411 truesize = mergeable_ctx_to_truesize(ctx); 1412 headroom = mergeable_ctx_to_headroom(ctx); 1413 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1414 room = SKB_DATA_ALIGN(headroom + tailroom); 1415 if (unlikely(len > truesize - room)) { 1416 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1417 dev->name, len, (unsigned long)(truesize - room)); 1418 dev->stats.rx_length_errors++; 1419 goto err_skb; 1420 } 1421 1422 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 1423 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 1424 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 1425 1426 if (unlikely(!nskb)) 1427 goto err_skb; 1428 if (curr_skb == head_skb) 1429 skb_shinfo(curr_skb)->frag_list = nskb; 1430 else 1431 curr_skb->next = nskb; 1432 curr_skb = nskb; 1433 head_skb->truesize += nskb->truesize; 1434 num_skb_frags = 0; 1435 } 1436 if (curr_skb != head_skb) { 1437 head_skb->data_len += len; 1438 head_skb->len += len; 1439 head_skb->truesize += truesize; 1440 } 1441 offset = buf - page_address(page); 1442 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 1443 put_page(page); 1444 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 1445 len, truesize); 1446 } else { 1447 skb_add_rx_frag(curr_skb, num_skb_frags, page, 1448 offset, len, truesize); 1449 } 1450 } 1451 1452 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 1453 return head_skb; 1454 1455 err_xdp: 1456 rcu_read_unlock(); 1457 stats->xdp_drops++; 1458 err_skb: 1459 put_page(page); 1460 mergeable_buf_free(rq, num_buf, dev, stats); 1461 1462 err_buf: 1463 stats->drops++; 1464 dev_kfree_skb(head_skb); 1465 xdp_xmit: 1466 return NULL; 1467 } 1468 1469 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash, 1470 struct sk_buff *skb) 1471 { 1472 enum pkt_hash_types rss_hash_type; 1473 1474 if (!hdr_hash || !skb) 1475 return; 1476 1477 switch (__le16_to_cpu(hdr_hash->hash_report)) { 1478 case VIRTIO_NET_HASH_REPORT_TCPv4: 1479 case VIRTIO_NET_HASH_REPORT_UDPv4: 1480 case VIRTIO_NET_HASH_REPORT_TCPv6: 1481 case VIRTIO_NET_HASH_REPORT_UDPv6: 1482 case VIRTIO_NET_HASH_REPORT_TCPv6_EX: 1483 case VIRTIO_NET_HASH_REPORT_UDPv6_EX: 1484 rss_hash_type = PKT_HASH_TYPE_L4; 1485 break; 1486 case VIRTIO_NET_HASH_REPORT_IPv4: 1487 case VIRTIO_NET_HASH_REPORT_IPv6: 1488 case VIRTIO_NET_HASH_REPORT_IPv6_EX: 1489 rss_hash_type = PKT_HASH_TYPE_L3; 1490 break; 1491 case VIRTIO_NET_HASH_REPORT_NONE: 1492 default: 1493 rss_hash_type = PKT_HASH_TYPE_NONE; 1494 } 1495 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type); 1496 } 1497 1498 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 1499 void *buf, unsigned int len, void **ctx, 1500 unsigned int *xdp_xmit, 1501 struct virtnet_rq_stats *stats) 1502 { 1503 struct net_device *dev = vi->dev; 1504 struct sk_buff *skb; 1505 struct virtio_net_hdr_mrg_rxbuf *hdr; 1506 1507 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1508 pr_debug("%s: short packet %i\n", dev->name, len); 1509 dev->stats.rx_length_errors++; 1510 virtnet_rq_free_unused_buf(rq->vq, buf); 1511 return; 1512 } 1513 1514 if (vi->mergeable_rx_bufs) 1515 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1516 stats); 1517 else if (vi->big_packets) 1518 skb = receive_big(dev, vi, rq, buf, len, stats); 1519 else 1520 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1521 1522 if (unlikely(!skb)) 1523 return; 1524 1525 hdr = skb_vnet_hdr(skb); 1526 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report) 1527 virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb); 1528 1529 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1530 skb->ip_summed = CHECKSUM_UNNECESSARY; 1531 1532 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1533 virtio_is_little_endian(vi->vdev))) { 1534 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1535 dev->name, hdr->hdr.gso_type, 1536 hdr->hdr.gso_size); 1537 goto frame_err; 1538 } 1539 1540 skb_record_rx_queue(skb, vq2rxq(rq->vq)); 1541 skb->protocol = eth_type_trans(skb, dev); 1542 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1543 ntohs(skb->protocol), skb->len, skb->pkt_type); 1544 1545 napi_gro_receive(&rq->napi, skb); 1546 return; 1547 1548 frame_err: 1549 dev->stats.rx_frame_errors++; 1550 dev_kfree_skb(skb); 1551 } 1552 1553 /* Unlike mergeable buffers, all buffers are allocated to the 1554 * same size, except for the headroom. For this reason we do 1555 * not need to use mergeable_len_to_ctx here - it is enough 1556 * to store the headroom as the context ignoring the truesize. 1557 */ 1558 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1559 gfp_t gfp) 1560 { 1561 struct page_frag *alloc_frag = &rq->alloc_frag; 1562 char *buf; 1563 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1564 void *ctx = (void *)(unsigned long)xdp_headroom; 1565 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1566 int err; 1567 1568 len = SKB_DATA_ALIGN(len) + 1569 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1570 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1571 return -ENOMEM; 1572 1573 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1574 get_page(alloc_frag->page); 1575 alloc_frag->offset += len; 1576 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1577 vi->hdr_len + GOOD_PACKET_LEN); 1578 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1579 if (err < 0) 1580 put_page(virt_to_head_page(buf)); 1581 return err; 1582 } 1583 1584 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1585 gfp_t gfp) 1586 { 1587 struct page *first, *list = NULL; 1588 char *p; 1589 int i, err, offset; 1590 1591 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2); 1592 1593 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */ 1594 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) { 1595 first = get_a_page(rq, gfp); 1596 if (!first) { 1597 if (list) 1598 give_pages(rq, list); 1599 return -ENOMEM; 1600 } 1601 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1602 1603 /* chain new page in list head to match sg */ 1604 first->private = (unsigned long)list; 1605 list = first; 1606 } 1607 1608 first = get_a_page(rq, gfp); 1609 if (!first) { 1610 give_pages(rq, list); 1611 return -ENOMEM; 1612 } 1613 p = page_address(first); 1614 1615 /* rq->sg[0], rq->sg[1] share the same page */ 1616 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1617 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1618 1619 /* rq->sg[1] for data packet, from offset */ 1620 offset = sizeof(struct padded_vnet_hdr); 1621 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1622 1623 /* chain first in list head */ 1624 first->private = (unsigned long)list; 1625 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2, 1626 first, gfp); 1627 if (err < 0) 1628 give_pages(rq, first); 1629 1630 return err; 1631 } 1632 1633 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1634 struct ewma_pkt_len *avg_pkt_len, 1635 unsigned int room) 1636 { 1637 struct virtnet_info *vi = rq->vq->vdev->priv; 1638 const size_t hdr_len = vi->hdr_len; 1639 unsigned int len; 1640 1641 if (room) 1642 return PAGE_SIZE - room; 1643 1644 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1645 rq->min_buf_len, PAGE_SIZE - hdr_len); 1646 1647 return ALIGN(len, L1_CACHE_BYTES); 1648 } 1649 1650 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1651 struct receive_queue *rq, gfp_t gfp) 1652 { 1653 struct page_frag *alloc_frag = &rq->alloc_frag; 1654 unsigned int headroom = virtnet_get_headroom(vi); 1655 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1656 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1657 char *buf; 1658 void *ctx; 1659 int err; 1660 unsigned int len, hole; 1661 1662 /* Extra tailroom is needed to satisfy XDP's assumption. This 1663 * means rx frags coalescing won't work, but consider we've 1664 * disabled GSO for XDP, it won't be a big issue. 1665 */ 1666 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1667 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1668 return -ENOMEM; 1669 1670 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1671 buf += headroom; /* advance address leaving hole at front of pkt */ 1672 get_page(alloc_frag->page); 1673 alloc_frag->offset += len + room; 1674 hole = alloc_frag->size - alloc_frag->offset; 1675 if (hole < len + room) { 1676 /* To avoid internal fragmentation, if there is very likely not 1677 * enough space for another buffer, add the remaining space to 1678 * the current buffer. 1679 * XDP core assumes that frame_size of xdp_buff and the length 1680 * of the frag are PAGE_SIZE, so we disable the hole mechanism. 1681 */ 1682 if (!headroom) 1683 len += hole; 1684 alloc_frag->offset += hole; 1685 } 1686 1687 sg_init_one(rq->sg, buf, len); 1688 ctx = mergeable_len_to_ctx(len + room, headroom); 1689 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1690 if (err < 0) 1691 put_page(virt_to_head_page(buf)); 1692 1693 return err; 1694 } 1695 1696 /* 1697 * Returns false if we couldn't fill entirely (OOM). 1698 * 1699 * Normally run in the receive path, but can also be run from ndo_open 1700 * before we're receiving packets, or from refill_work which is 1701 * careful to disable receiving (using napi_disable). 1702 */ 1703 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1704 gfp_t gfp) 1705 { 1706 int err; 1707 bool oom; 1708 1709 do { 1710 if (vi->mergeable_rx_bufs) 1711 err = add_recvbuf_mergeable(vi, rq, gfp); 1712 else if (vi->big_packets) 1713 err = add_recvbuf_big(vi, rq, gfp); 1714 else 1715 err = add_recvbuf_small(vi, rq, gfp); 1716 1717 oom = err == -ENOMEM; 1718 if (err) 1719 break; 1720 } while (rq->vq->num_free); 1721 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1722 unsigned long flags; 1723 1724 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); 1725 rq->stats.kicks++; 1726 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); 1727 } 1728 1729 return !oom; 1730 } 1731 1732 static void skb_recv_done(struct virtqueue *rvq) 1733 { 1734 struct virtnet_info *vi = rvq->vdev->priv; 1735 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1736 1737 virtqueue_napi_schedule(&rq->napi, rvq); 1738 } 1739 1740 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1741 { 1742 napi_enable(napi); 1743 1744 /* If all buffers were filled by other side before we napi_enabled, we 1745 * won't get another interrupt, so process any outstanding packets now. 1746 * Call local_bh_enable after to trigger softIRQ processing. 1747 */ 1748 local_bh_disable(); 1749 virtqueue_napi_schedule(napi, vq); 1750 local_bh_enable(); 1751 } 1752 1753 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1754 struct virtqueue *vq, 1755 struct napi_struct *napi) 1756 { 1757 if (!napi->weight) 1758 return; 1759 1760 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1761 * enable the feature if this is likely affine with the transmit path. 1762 */ 1763 if (!vi->affinity_hint_set) { 1764 napi->weight = 0; 1765 return; 1766 } 1767 1768 return virtnet_napi_enable(vq, napi); 1769 } 1770 1771 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1772 { 1773 if (napi->weight) 1774 napi_disable(napi); 1775 } 1776 1777 static void refill_work(struct work_struct *work) 1778 { 1779 struct virtnet_info *vi = 1780 container_of(work, struct virtnet_info, refill.work); 1781 bool still_empty; 1782 int i; 1783 1784 for (i = 0; i < vi->curr_queue_pairs; i++) { 1785 struct receive_queue *rq = &vi->rq[i]; 1786 1787 napi_disable(&rq->napi); 1788 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1789 virtnet_napi_enable(rq->vq, &rq->napi); 1790 1791 /* In theory, this can happen: if we don't get any buffers in 1792 * we will *never* try to fill again. 1793 */ 1794 if (still_empty) 1795 schedule_delayed_work(&vi->refill, HZ/2); 1796 } 1797 } 1798 1799 static int virtnet_receive(struct receive_queue *rq, int budget, 1800 unsigned int *xdp_xmit) 1801 { 1802 struct virtnet_info *vi = rq->vq->vdev->priv; 1803 struct virtnet_rq_stats stats = {}; 1804 unsigned int len; 1805 void *buf; 1806 int i; 1807 1808 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1809 void *ctx; 1810 1811 while (stats.packets < budget && 1812 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1813 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1814 stats.packets++; 1815 } 1816 } else { 1817 while (stats.packets < budget && 1818 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1819 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1820 stats.packets++; 1821 } 1822 } 1823 1824 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { 1825 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { 1826 spin_lock(&vi->refill_lock); 1827 if (vi->refill_enabled) 1828 schedule_delayed_work(&vi->refill, 0); 1829 spin_unlock(&vi->refill_lock); 1830 } 1831 } 1832 1833 u64_stats_update_begin(&rq->stats.syncp); 1834 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1835 size_t offset = virtnet_rq_stats_desc[i].offset; 1836 u64 *item; 1837 1838 item = (u64 *)((u8 *)&rq->stats + offset); 1839 *item += *(u64 *)((u8 *)&stats + offset); 1840 } 1841 u64_stats_update_end(&rq->stats.syncp); 1842 1843 return stats.packets; 1844 } 1845 1846 static void virtnet_poll_cleantx(struct receive_queue *rq) 1847 { 1848 struct virtnet_info *vi = rq->vq->vdev->priv; 1849 unsigned int index = vq2rxq(rq->vq); 1850 struct send_queue *sq = &vi->sq[index]; 1851 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1852 1853 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) 1854 return; 1855 1856 if (__netif_tx_trylock(txq)) { 1857 if (sq->reset) { 1858 __netif_tx_unlock(txq); 1859 return; 1860 } 1861 1862 do { 1863 virtqueue_disable_cb(sq->vq); 1864 free_old_xmit_skbs(sq, true); 1865 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 1866 1867 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1868 netif_tx_wake_queue(txq); 1869 1870 __netif_tx_unlock(txq); 1871 } 1872 } 1873 1874 static int virtnet_poll(struct napi_struct *napi, int budget) 1875 { 1876 struct receive_queue *rq = 1877 container_of(napi, struct receive_queue, napi); 1878 struct virtnet_info *vi = rq->vq->vdev->priv; 1879 struct send_queue *sq; 1880 unsigned int received; 1881 unsigned int xdp_xmit = 0; 1882 1883 virtnet_poll_cleantx(rq); 1884 1885 received = virtnet_receive(rq, budget, &xdp_xmit); 1886 1887 if (xdp_xmit & VIRTIO_XDP_REDIR) 1888 xdp_do_flush(); 1889 1890 /* Out of packets? */ 1891 if (received < budget) 1892 virtqueue_napi_complete(napi, rq->vq, received); 1893 1894 if (xdp_xmit & VIRTIO_XDP_TX) { 1895 sq = virtnet_xdp_get_sq(vi); 1896 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1897 u64_stats_update_begin(&sq->stats.syncp); 1898 sq->stats.kicks++; 1899 u64_stats_update_end(&sq->stats.syncp); 1900 } 1901 virtnet_xdp_put_sq(vi, sq); 1902 } 1903 1904 return received; 1905 } 1906 1907 static int virtnet_open(struct net_device *dev) 1908 { 1909 struct virtnet_info *vi = netdev_priv(dev); 1910 int i, err; 1911 1912 enable_delayed_refill(vi); 1913 1914 for (i = 0; i < vi->max_queue_pairs; i++) { 1915 if (i < vi->curr_queue_pairs) 1916 /* Make sure we have some buffers: if oom use wq. */ 1917 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 1918 schedule_delayed_work(&vi->refill, 0); 1919 1920 err = xdp_rxq_info_reg(&vi->rq[i].xdp_rxq, dev, i, vi->rq[i].napi.napi_id); 1921 if (err < 0) 1922 return err; 1923 1924 err = xdp_rxq_info_reg_mem_model(&vi->rq[i].xdp_rxq, 1925 MEM_TYPE_PAGE_SHARED, NULL); 1926 if (err < 0) { 1927 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 1928 return err; 1929 } 1930 1931 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 1932 virtnet_napi_tx_enable(vi, vi->sq[i].vq, &vi->sq[i].napi); 1933 } 1934 1935 return 0; 1936 } 1937 1938 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 1939 { 1940 struct send_queue *sq = container_of(napi, struct send_queue, napi); 1941 struct virtnet_info *vi = sq->vq->vdev->priv; 1942 unsigned int index = vq2txq(sq->vq); 1943 struct netdev_queue *txq; 1944 int opaque; 1945 bool done; 1946 1947 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { 1948 /* We don't need to enable cb for XDP */ 1949 napi_complete_done(napi, 0); 1950 return 0; 1951 } 1952 1953 txq = netdev_get_tx_queue(vi->dev, index); 1954 __netif_tx_lock(txq, raw_smp_processor_id()); 1955 virtqueue_disable_cb(sq->vq); 1956 free_old_xmit_skbs(sq, true); 1957 1958 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1959 netif_tx_wake_queue(txq); 1960 1961 opaque = virtqueue_enable_cb_prepare(sq->vq); 1962 1963 done = napi_complete_done(napi, 0); 1964 1965 if (!done) 1966 virtqueue_disable_cb(sq->vq); 1967 1968 __netif_tx_unlock(txq); 1969 1970 if (done) { 1971 if (unlikely(virtqueue_poll(sq->vq, opaque))) { 1972 if (napi_schedule_prep(napi)) { 1973 __netif_tx_lock(txq, raw_smp_processor_id()); 1974 virtqueue_disable_cb(sq->vq); 1975 __netif_tx_unlock(txq); 1976 __napi_schedule(napi); 1977 } 1978 } 1979 } 1980 1981 return 0; 1982 } 1983 1984 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 1985 { 1986 struct virtio_net_hdr_mrg_rxbuf *hdr; 1987 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 1988 struct virtnet_info *vi = sq->vq->vdev->priv; 1989 int num_sg; 1990 unsigned hdr_len = vi->hdr_len; 1991 bool can_push; 1992 1993 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 1994 1995 can_push = vi->any_header_sg && 1996 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 1997 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 1998 /* Even if we can, don't push here yet as this would skew 1999 * csum_start offset below. */ 2000 if (can_push) 2001 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 2002 else 2003 hdr = skb_vnet_hdr(skb); 2004 2005 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 2006 virtio_is_little_endian(vi->vdev), false, 2007 0)) 2008 return -EPROTO; 2009 2010 if (vi->mergeable_rx_bufs) 2011 hdr->num_buffers = 0; 2012 2013 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 2014 if (can_push) { 2015 __skb_push(skb, hdr_len); 2016 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 2017 if (unlikely(num_sg < 0)) 2018 return num_sg; 2019 /* Pull header back to avoid skew in tx bytes calculations. */ 2020 __skb_pull(skb, hdr_len); 2021 } else { 2022 sg_set_buf(sq->sg, hdr, hdr_len); 2023 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 2024 if (unlikely(num_sg < 0)) 2025 return num_sg; 2026 num_sg++; 2027 } 2028 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 2029 } 2030 2031 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 2032 { 2033 struct virtnet_info *vi = netdev_priv(dev); 2034 int qnum = skb_get_queue_mapping(skb); 2035 struct send_queue *sq = &vi->sq[qnum]; 2036 int err; 2037 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 2038 bool kick = !netdev_xmit_more(); 2039 bool use_napi = sq->napi.weight; 2040 2041 /* Free up any pending old buffers before queueing new ones. */ 2042 do { 2043 if (use_napi) 2044 virtqueue_disable_cb(sq->vq); 2045 2046 free_old_xmit_skbs(sq, false); 2047 2048 } while (use_napi && kick && 2049 unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 2050 2051 /* timestamp packet in software */ 2052 skb_tx_timestamp(skb); 2053 2054 /* Try to transmit */ 2055 err = xmit_skb(sq, skb); 2056 2057 /* This should not happen! */ 2058 if (unlikely(err)) { 2059 dev->stats.tx_fifo_errors++; 2060 if (net_ratelimit()) 2061 dev_warn(&dev->dev, 2062 "Unexpected TXQ (%d) queue failure: %d\n", 2063 qnum, err); 2064 dev->stats.tx_dropped++; 2065 dev_kfree_skb_any(skb); 2066 return NETDEV_TX_OK; 2067 } 2068 2069 /* Don't wait up for transmitted skbs to be freed. */ 2070 if (!use_napi) { 2071 skb_orphan(skb); 2072 nf_reset_ct(skb); 2073 } 2074 2075 check_sq_full_and_disable(vi, dev, sq); 2076 2077 if (kick || netif_xmit_stopped(txq)) { 2078 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 2079 u64_stats_update_begin(&sq->stats.syncp); 2080 sq->stats.kicks++; 2081 u64_stats_update_end(&sq->stats.syncp); 2082 } 2083 } 2084 2085 return NETDEV_TX_OK; 2086 } 2087 2088 static int virtnet_rx_resize(struct virtnet_info *vi, 2089 struct receive_queue *rq, u32 ring_num) 2090 { 2091 bool running = netif_running(vi->dev); 2092 int err, qindex; 2093 2094 qindex = rq - vi->rq; 2095 2096 if (running) 2097 napi_disable(&rq->napi); 2098 2099 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); 2100 if (err) 2101 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); 2102 2103 if (!try_fill_recv(vi, rq, GFP_KERNEL)) 2104 schedule_delayed_work(&vi->refill, 0); 2105 2106 if (running) 2107 virtnet_napi_enable(rq->vq, &rq->napi); 2108 return err; 2109 } 2110 2111 static int virtnet_tx_resize(struct virtnet_info *vi, 2112 struct send_queue *sq, u32 ring_num) 2113 { 2114 bool running = netif_running(vi->dev); 2115 struct netdev_queue *txq; 2116 int err, qindex; 2117 2118 qindex = sq - vi->sq; 2119 2120 if (running) 2121 virtnet_napi_tx_disable(&sq->napi); 2122 2123 txq = netdev_get_tx_queue(vi->dev, qindex); 2124 2125 /* 1. wait all ximt complete 2126 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue() 2127 */ 2128 __netif_tx_lock_bh(txq); 2129 2130 /* Prevent rx poll from accessing sq. */ 2131 sq->reset = true; 2132 2133 /* Prevent the upper layer from trying to send packets. */ 2134 netif_stop_subqueue(vi->dev, qindex); 2135 2136 __netif_tx_unlock_bh(txq); 2137 2138 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf); 2139 if (err) 2140 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err); 2141 2142 __netif_tx_lock_bh(txq); 2143 sq->reset = false; 2144 netif_tx_wake_queue(txq); 2145 __netif_tx_unlock_bh(txq); 2146 2147 if (running) 2148 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi); 2149 return err; 2150 } 2151 2152 /* 2153 * Send command via the control virtqueue and check status. Commands 2154 * supported by the hypervisor, as indicated by feature bits, should 2155 * never fail unless improperly formatted. 2156 */ 2157 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 2158 struct scatterlist *out) 2159 { 2160 struct scatterlist *sgs[4], hdr, stat; 2161 unsigned out_num = 0, tmp; 2162 int ret; 2163 2164 /* Caller should know better */ 2165 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 2166 2167 vi->ctrl->status = ~0; 2168 vi->ctrl->hdr.class = class; 2169 vi->ctrl->hdr.cmd = cmd; 2170 /* Add header */ 2171 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 2172 sgs[out_num++] = &hdr; 2173 2174 if (out) 2175 sgs[out_num++] = out; 2176 2177 /* Add return status. */ 2178 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 2179 sgs[out_num] = &stat; 2180 2181 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 2182 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 2183 if (ret < 0) { 2184 dev_warn(&vi->vdev->dev, 2185 "Failed to add sgs for command vq: %d\n.", ret); 2186 return false; 2187 } 2188 2189 if (unlikely(!virtqueue_kick(vi->cvq))) 2190 return vi->ctrl->status == VIRTIO_NET_OK; 2191 2192 /* Spin for a response, the kick causes an ioport write, trapping 2193 * into the hypervisor, so the request should be handled immediately. 2194 */ 2195 while (!virtqueue_get_buf(vi->cvq, &tmp) && 2196 !virtqueue_is_broken(vi->cvq)) 2197 cpu_relax(); 2198 2199 return vi->ctrl->status == VIRTIO_NET_OK; 2200 } 2201 2202 static int virtnet_set_mac_address(struct net_device *dev, void *p) 2203 { 2204 struct virtnet_info *vi = netdev_priv(dev); 2205 struct virtio_device *vdev = vi->vdev; 2206 int ret; 2207 struct sockaddr *addr; 2208 struct scatterlist sg; 2209 2210 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2211 return -EOPNOTSUPP; 2212 2213 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 2214 if (!addr) 2215 return -ENOMEM; 2216 2217 ret = eth_prepare_mac_addr_change(dev, addr); 2218 if (ret) 2219 goto out; 2220 2221 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 2222 sg_init_one(&sg, addr->sa_data, dev->addr_len); 2223 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2224 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 2225 dev_warn(&vdev->dev, 2226 "Failed to set mac address by vq command.\n"); 2227 ret = -EINVAL; 2228 goto out; 2229 } 2230 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 2231 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 2232 unsigned int i; 2233 2234 /* Naturally, this has an atomicity problem. */ 2235 for (i = 0; i < dev->addr_len; i++) 2236 virtio_cwrite8(vdev, 2237 offsetof(struct virtio_net_config, mac) + 2238 i, addr->sa_data[i]); 2239 } 2240 2241 eth_commit_mac_addr_change(dev, p); 2242 ret = 0; 2243 2244 out: 2245 kfree(addr); 2246 return ret; 2247 } 2248 2249 static void virtnet_stats(struct net_device *dev, 2250 struct rtnl_link_stats64 *tot) 2251 { 2252 struct virtnet_info *vi = netdev_priv(dev); 2253 unsigned int start; 2254 int i; 2255 2256 for (i = 0; i < vi->max_queue_pairs; i++) { 2257 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops; 2258 struct receive_queue *rq = &vi->rq[i]; 2259 struct send_queue *sq = &vi->sq[i]; 2260 2261 do { 2262 start = u64_stats_fetch_begin(&sq->stats.syncp); 2263 tpackets = sq->stats.packets; 2264 tbytes = sq->stats.bytes; 2265 terrors = sq->stats.tx_timeouts; 2266 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2267 2268 do { 2269 start = u64_stats_fetch_begin(&rq->stats.syncp); 2270 rpackets = rq->stats.packets; 2271 rbytes = rq->stats.bytes; 2272 rdrops = rq->stats.drops; 2273 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2274 2275 tot->rx_packets += rpackets; 2276 tot->tx_packets += tpackets; 2277 tot->rx_bytes += rbytes; 2278 tot->tx_bytes += tbytes; 2279 tot->rx_dropped += rdrops; 2280 tot->tx_errors += terrors; 2281 } 2282 2283 tot->tx_dropped = dev->stats.tx_dropped; 2284 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 2285 tot->rx_length_errors = dev->stats.rx_length_errors; 2286 tot->rx_frame_errors = dev->stats.rx_frame_errors; 2287 } 2288 2289 static void virtnet_ack_link_announce(struct virtnet_info *vi) 2290 { 2291 rtnl_lock(); 2292 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 2293 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 2294 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 2295 rtnl_unlock(); 2296 } 2297 2298 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2299 { 2300 struct scatterlist sg; 2301 struct net_device *dev = vi->dev; 2302 2303 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 2304 return 0; 2305 2306 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 2307 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 2308 2309 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2310 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 2311 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 2312 queue_pairs); 2313 return -EINVAL; 2314 } else { 2315 vi->curr_queue_pairs = queue_pairs; 2316 /* virtnet_open() will refill when device is going to up. */ 2317 if (dev->flags & IFF_UP) 2318 schedule_delayed_work(&vi->refill, 0); 2319 } 2320 2321 return 0; 2322 } 2323 2324 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2325 { 2326 int err; 2327 2328 rtnl_lock(); 2329 err = _virtnet_set_queues(vi, queue_pairs); 2330 rtnl_unlock(); 2331 return err; 2332 } 2333 2334 static int virtnet_close(struct net_device *dev) 2335 { 2336 struct virtnet_info *vi = netdev_priv(dev); 2337 int i; 2338 2339 /* Make sure NAPI doesn't schedule refill work */ 2340 disable_delayed_refill(vi); 2341 /* Make sure refill_work doesn't re-enable napi! */ 2342 cancel_delayed_work_sync(&vi->refill); 2343 2344 for (i = 0; i < vi->max_queue_pairs; i++) { 2345 virtnet_napi_tx_disable(&vi->sq[i].napi); 2346 napi_disable(&vi->rq[i].napi); 2347 xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq); 2348 } 2349 2350 return 0; 2351 } 2352 2353 static void virtnet_set_rx_mode(struct net_device *dev) 2354 { 2355 struct virtnet_info *vi = netdev_priv(dev); 2356 struct scatterlist sg[2]; 2357 struct virtio_net_ctrl_mac *mac_data; 2358 struct netdev_hw_addr *ha; 2359 int uc_count; 2360 int mc_count; 2361 void *buf; 2362 int i; 2363 2364 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 2365 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 2366 return; 2367 2368 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 2369 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 2370 2371 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 2372 2373 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2374 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 2375 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 2376 vi->ctrl->promisc ? "en" : "dis"); 2377 2378 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 2379 2380 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2381 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 2382 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 2383 vi->ctrl->allmulti ? "en" : "dis"); 2384 2385 uc_count = netdev_uc_count(dev); 2386 mc_count = netdev_mc_count(dev); 2387 /* MAC filter - use one buffer for both lists */ 2388 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 2389 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 2390 mac_data = buf; 2391 if (!buf) 2392 return; 2393 2394 sg_init_table(sg, 2); 2395 2396 /* Store the unicast list and count in the front of the buffer */ 2397 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 2398 i = 0; 2399 netdev_for_each_uc_addr(ha, dev) 2400 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2401 2402 sg_set_buf(&sg[0], mac_data, 2403 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 2404 2405 /* multicast list and count fill the end */ 2406 mac_data = (void *)&mac_data->macs[uc_count][0]; 2407 2408 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 2409 i = 0; 2410 netdev_for_each_mc_addr(ha, dev) 2411 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2412 2413 sg_set_buf(&sg[1], mac_data, 2414 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 2415 2416 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2417 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 2418 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 2419 2420 kfree(buf); 2421 } 2422 2423 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 2424 __be16 proto, u16 vid) 2425 { 2426 struct virtnet_info *vi = netdev_priv(dev); 2427 struct scatterlist sg; 2428 2429 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2430 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2431 2432 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2433 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 2434 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 2435 return 0; 2436 } 2437 2438 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 2439 __be16 proto, u16 vid) 2440 { 2441 struct virtnet_info *vi = netdev_priv(dev); 2442 struct scatterlist sg; 2443 2444 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2445 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2446 2447 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2448 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 2449 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 2450 return 0; 2451 } 2452 2453 static void virtnet_clean_affinity(struct virtnet_info *vi) 2454 { 2455 int i; 2456 2457 if (vi->affinity_hint_set) { 2458 for (i = 0; i < vi->max_queue_pairs; i++) { 2459 virtqueue_set_affinity(vi->rq[i].vq, NULL); 2460 virtqueue_set_affinity(vi->sq[i].vq, NULL); 2461 } 2462 2463 vi->affinity_hint_set = false; 2464 } 2465 } 2466 2467 static void virtnet_set_affinity(struct virtnet_info *vi) 2468 { 2469 cpumask_var_t mask; 2470 int stragglers; 2471 int group_size; 2472 int i, j, cpu; 2473 int num_cpu; 2474 int stride; 2475 2476 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 2477 virtnet_clean_affinity(vi); 2478 return; 2479 } 2480 2481 num_cpu = num_online_cpus(); 2482 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 2483 stragglers = num_cpu >= vi->curr_queue_pairs ? 2484 num_cpu % vi->curr_queue_pairs : 2485 0; 2486 cpu = cpumask_first(cpu_online_mask); 2487 2488 for (i = 0; i < vi->curr_queue_pairs; i++) { 2489 group_size = stride + (i < stragglers ? 1 : 0); 2490 2491 for (j = 0; j < group_size; j++) { 2492 cpumask_set_cpu(cpu, mask); 2493 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 2494 nr_cpu_ids, false); 2495 } 2496 virtqueue_set_affinity(vi->rq[i].vq, mask); 2497 virtqueue_set_affinity(vi->sq[i].vq, mask); 2498 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS); 2499 cpumask_clear(mask); 2500 } 2501 2502 vi->affinity_hint_set = true; 2503 free_cpumask_var(mask); 2504 } 2505 2506 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 2507 { 2508 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2509 node); 2510 virtnet_set_affinity(vi); 2511 return 0; 2512 } 2513 2514 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 2515 { 2516 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2517 node_dead); 2518 virtnet_set_affinity(vi); 2519 return 0; 2520 } 2521 2522 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 2523 { 2524 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2525 node); 2526 2527 virtnet_clean_affinity(vi); 2528 return 0; 2529 } 2530 2531 static enum cpuhp_state virtionet_online; 2532 2533 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 2534 { 2535 int ret; 2536 2537 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 2538 if (ret) 2539 return ret; 2540 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2541 &vi->node_dead); 2542 if (!ret) 2543 return ret; 2544 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2545 return ret; 2546 } 2547 2548 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 2549 { 2550 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2551 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2552 &vi->node_dead); 2553 } 2554 2555 static void virtnet_get_ringparam(struct net_device *dev, 2556 struct ethtool_ringparam *ring, 2557 struct kernel_ethtool_ringparam *kernel_ring, 2558 struct netlink_ext_ack *extack) 2559 { 2560 struct virtnet_info *vi = netdev_priv(dev); 2561 2562 ring->rx_max_pending = vi->rq[0].vq->num_max; 2563 ring->tx_max_pending = vi->sq[0].vq->num_max; 2564 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2565 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2566 } 2567 2568 static int virtnet_set_ringparam(struct net_device *dev, 2569 struct ethtool_ringparam *ring, 2570 struct kernel_ethtool_ringparam *kernel_ring, 2571 struct netlink_ext_ack *extack) 2572 { 2573 struct virtnet_info *vi = netdev_priv(dev); 2574 u32 rx_pending, tx_pending; 2575 struct receive_queue *rq; 2576 struct send_queue *sq; 2577 int i, err; 2578 2579 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 2580 return -EINVAL; 2581 2582 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2583 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2584 2585 if (ring->rx_pending == rx_pending && 2586 ring->tx_pending == tx_pending) 2587 return 0; 2588 2589 if (ring->rx_pending > vi->rq[0].vq->num_max) 2590 return -EINVAL; 2591 2592 if (ring->tx_pending > vi->sq[0].vq->num_max) 2593 return -EINVAL; 2594 2595 for (i = 0; i < vi->max_queue_pairs; i++) { 2596 rq = vi->rq + i; 2597 sq = vi->sq + i; 2598 2599 if (ring->tx_pending != tx_pending) { 2600 err = virtnet_tx_resize(vi, sq, ring->tx_pending); 2601 if (err) 2602 return err; 2603 } 2604 2605 if (ring->rx_pending != rx_pending) { 2606 err = virtnet_rx_resize(vi, rq, ring->rx_pending); 2607 if (err) 2608 return err; 2609 } 2610 } 2611 2612 return 0; 2613 } 2614 2615 static bool virtnet_commit_rss_command(struct virtnet_info *vi) 2616 { 2617 struct net_device *dev = vi->dev; 2618 struct scatterlist sgs[4]; 2619 unsigned int sg_buf_size; 2620 2621 /* prepare sgs */ 2622 sg_init_table(sgs, 4); 2623 2624 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); 2625 sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); 2626 2627 sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1); 2628 sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); 2629 2630 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) 2631 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); 2632 sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); 2633 2634 sg_buf_size = vi->rss_key_size; 2635 sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size); 2636 2637 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2638 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG 2639 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) { 2640 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); 2641 return false; 2642 } 2643 return true; 2644 } 2645 2646 static void virtnet_init_default_rss(struct virtnet_info *vi) 2647 { 2648 u32 indir_val = 0; 2649 int i = 0; 2650 2651 vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; 2652 vi->rss_hash_types_saved = vi->rss_hash_types_supported; 2653 vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size 2654 ? vi->rss_indir_table_size - 1 : 0; 2655 vi->ctrl->rss.unclassified_queue = 0; 2656 2657 for (; i < vi->rss_indir_table_size; ++i) { 2658 indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); 2659 vi->ctrl->rss.indirection_table[i] = indir_val; 2660 } 2661 2662 vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; 2663 vi->ctrl->rss.hash_key_length = vi->rss_key_size; 2664 2665 netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); 2666 } 2667 2668 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info) 2669 { 2670 info->data = 0; 2671 switch (info->flow_type) { 2672 case TCP_V4_FLOW: 2673 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 2674 info->data = RXH_IP_SRC | RXH_IP_DST | 2675 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2676 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2677 info->data = RXH_IP_SRC | RXH_IP_DST; 2678 } 2679 break; 2680 case TCP_V6_FLOW: 2681 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 2682 info->data = RXH_IP_SRC | RXH_IP_DST | 2683 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2684 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2685 info->data = RXH_IP_SRC | RXH_IP_DST; 2686 } 2687 break; 2688 case UDP_V4_FLOW: 2689 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 2690 info->data = RXH_IP_SRC | RXH_IP_DST | 2691 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2692 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2693 info->data = RXH_IP_SRC | RXH_IP_DST; 2694 } 2695 break; 2696 case UDP_V6_FLOW: 2697 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 2698 info->data = RXH_IP_SRC | RXH_IP_DST | 2699 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2700 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2701 info->data = RXH_IP_SRC | RXH_IP_DST; 2702 } 2703 break; 2704 case IPV4_FLOW: 2705 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) 2706 info->data = RXH_IP_SRC | RXH_IP_DST; 2707 2708 break; 2709 case IPV6_FLOW: 2710 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) 2711 info->data = RXH_IP_SRC | RXH_IP_DST; 2712 2713 break; 2714 default: 2715 info->data = 0; 2716 break; 2717 } 2718 } 2719 2720 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info) 2721 { 2722 u32 new_hashtypes = vi->rss_hash_types_saved; 2723 bool is_disable = info->data & RXH_DISCARD; 2724 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3); 2725 2726 /* supports only 'sd', 'sdfn' and 'r' */ 2727 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable)) 2728 return false; 2729 2730 switch (info->flow_type) { 2731 case TCP_V4_FLOW: 2732 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4); 2733 if (!is_disable) 2734 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2735 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0); 2736 break; 2737 case UDP_V4_FLOW: 2738 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4); 2739 if (!is_disable) 2740 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2741 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0); 2742 break; 2743 case IPV4_FLOW: 2744 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2745 if (!is_disable) 2746 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2747 break; 2748 case TCP_V6_FLOW: 2749 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6); 2750 if (!is_disable) 2751 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2752 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0); 2753 break; 2754 case UDP_V6_FLOW: 2755 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6); 2756 if (!is_disable) 2757 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2758 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0); 2759 break; 2760 case IPV6_FLOW: 2761 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2762 if (!is_disable) 2763 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2764 break; 2765 default: 2766 /* unsupported flow */ 2767 return false; 2768 } 2769 2770 /* if unsupported hashtype was set */ 2771 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported)) 2772 return false; 2773 2774 if (new_hashtypes != vi->rss_hash_types_saved) { 2775 vi->rss_hash_types_saved = new_hashtypes; 2776 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 2777 if (vi->dev->features & NETIF_F_RXHASH) 2778 return virtnet_commit_rss_command(vi); 2779 } 2780 2781 return true; 2782 } 2783 2784 static void virtnet_get_drvinfo(struct net_device *dev, 2785 struct ethtool_drvinfo *info) 2786 { 2787 struct virtnet_info *vi = netdev_priv(dev); 2788 struct virtio_device *vdev = vi->vdev; 2789 2790 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 2791 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 2792 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 2793 2794 } 2795 2796 /* TODO: Eliminate OOO packets during switching */ 2797 static int virtnet_set_channels(struct net_device *dev, 2798 struct ethtool_channels *channels) 2799 { 2800 struct virtnet_info *vi = netdev_priv(dev); 2801 u16 queue_pairs = channels->combined_count; 2802 int err; 2803 2804 /* We don't support separate rx/tx channels. 2805 * We don't allow setting 'other' channels. 2806 */ 2807 if (channels->rx_count || channels->tx_count || channels->other_count) 2808 return -EINVAL; 2809 2810 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2811 return -EINVAL; 2812 2813 /* For now we don't support modifying channels while XDP is loaded 2814 * also when XDP is loaded all RX queues have XDP programs so we only 2815 * need to check a single RX queue. 2816 */ 2817 if (vi->rq[0].xdp_prog) 2818 return -EINVAL; 2819 2820 cpus_read_lock(); 2821 err = _virtnet_set_queues(vi, queue_pairs); 2822 if (err) { 2823 cpus_read_unlock(); 2824 goto err; 2825 } 2826 virtnet_set_affinity(vi); 2827 cpus_read_unlock(); 2828 2829 netif_set_real_num_tx_queues(dev, queue_pairs); 2830 netif_set_real_num_rx_queues(dev, queue_pairs); 2831 err: 2832 return err; 2833 } 2834 2835 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2836 { 2837 struct virtnet_info *vi = netdev_priv(dev); 2838 unsigned int i, j; 2839 u8 *p = data; 2840 2841 switch (stringset) { 2842 case ETH_SS_STATS: 2843 for (i = 0; i < vi->curr_queue_pairs; i++) { 2844 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) 2845 ethtool_sprintf(&p, "rx_queue_%u_%s", i, 2846 virtnet_rq_stats_desc[j].desc); 2847 } 2848 2849 for (i = 0; i < vi->curr_queue_pairs; i++) { 2850 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) 2851 ethtool_sprintf(&p, "tx_queue_%u_%s", i, 2852 virtnet_sq_stats_desc[j].desc); 2853 } 2854 break; 2855 } 2856 } 2857 2858 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2859 { 2860 struct virtnet_info *vi = netdev_priv(dev); 2861 2862 switch (sset) { 2863 case ETH_SS_STATS: 2864 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2865 VIRTNET_SQ_STATS_LEN); 2866 default: 2867 return -EOPNOTSUPP; 2868 } 2869 } 2870 2871 static void virtnet_get_ethtool_stats(struct net_device *dev, 2872 struct ethtool_stats *stats, u64 *data) 2873 { 2874 struct virtnet_info *vi = netdev_priv(dev); 2875 unsigned int idx = 0, start, i, j; 2876 const u8 *stats_base; 2877 size_t offset; 2878 2879 for (i = 0; i < vi->curr_queue_pairs; i++) { 2880 struct receive_queue *rq = &vi->rq[i]; 2881 2882 stats_base = (u8 *)&rq->stats; 2883 do { 2884 start = u64_stats_fetch_begin(&rq->stats.syncp); 2885 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2886 offset = virtnet_rq_stats_desc[j].offset; 2887 data[idx + j] = *(u64 *)(stats_base + offset); 2888 } 2889 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2890 idx += VIRTNET_RQ_STATS_LEN; 2891 } 2892 2893 for (i = 0; i < vi->curr_queue_pairs; i++) { 2894 struct send_queue *sq = &vi->sq[i]; 2895 2896 stats_base = (u8 *)&sq->stats; 2897 do { 2898 start = u64_stats_fetch_begin(&sq->stats.syncp); 2899 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 2900 offset = virtnet_sq_stats_desc[j].offset; 2901 data[idx + j] = *(u64 *)(stats_base + offset); 2902 } 2903 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2904 idx += VIRTNET_SQ_STATS_LEN; 2905 } 2906 } 2907 2908 static void virtnet_get_channels(struct net_device *dev, 2909 struct ethtool_channels *channels) 2910 { 2911 struct virtnet_info *vi = netdev_priv(dev); 2912 2913 channels->combined_count = vi->curr_queue_pairs; 2914 channels->max_combined = vi->max_queue_pairs; 2915 channels->max_other = 0; 2916 channels->rx_count = 0; 2917 channels->tx_count = 0; 2918 channels->other_count = 0; 2919 } 2920 2921 static int virtnet_set_link_ksettings(struct net_device *dev, 2922 const struct ethtool_link_ksettings *cmd) 2923 { 2924 struct virtnet_info *vi = netdev_priv(dev); 2925 2926 return ethtool_virtdev_set_link_ksettings(dev, cmd, 2927 &vi->speed, &vi->duplex); 2928 } 2929 2930 static int virtnet_get_link_ksettings(struct net_device *dev, 2931 struct ethtool_link_ksettings *cmd) 2932 { 2933 struct virtnet_info *vi = netdev_priv(dev); 2934 2935 cmd->base.speed = vi->speed; 2936 cmd->base.duplex = vi->duplex; 2937 cmd->base.port = PORT_OTHER; 2938 2939 return 0; 2940 } 2941 2942 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi, 2943 struct ethtool_coalesce *ec) 2944 { 2945 struct scatterlist sgs_tx, sgs_rx; 2946 struct virtio_net_ctrl_coal_tx coal_tx; 2947 struct virtio_net_ctrl_coal_rx coal_rx; 2948 2949 coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs); 2950 coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames); 2951 sg_init_one(&sgs_tx, &coal_tx, sizeof(coal_tx)); 2952 2953 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2954 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET, 2955 &sgs_tx)) 2956 return -EINVAL; 2957 2958 /* Save parameters */ 2959 vi->tx_usecs = ec->tx_coalesce_usecs; 2960 vi->tx_max_packets = ec->tx_max_coalesced_frames; 2961 2962 coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); 2963 coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); 2964 sg_init_one(&sgs_rx, &coal_rx, sizeof(coal_rx)); 2965 2966 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 2967 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, 2968 &sgs_rx)) 2969 return -EINVAL; 2970 2971 /* Save parameters */ 2972 vi->rx_usecs = ec->rx_coalesce_usecs; 2973 vi->rx_max_packets = ec->rx_max_coalesced_frames; 2974 2975 return 0; 2976 } 2977 2978 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec) 2979 { 2980 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL 2981 * feature is negotiated. 2982 */ 2983 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs) 2984 return -EOPNOTSUPP; 2985 2986 if (ec->tx_max_coalesced_frames > 1 || 2987 ec->rx_max_coalesced_frames != 1) 2988 return -EINVAL; 2989 2990 return 0; 2991 } 2992 2993 static int virtnet_set_coalesce(struct net_device *dev, 2994 struct ethtool_coalesce *ec, 2995 struct kernel_ethtool_coalesce *kernel_coal, 2996 struct netlink_ext_ack *extack) 2997 { 2998 struct virtnet_info *vi = netdev_priv(dev); 2999 int ret, i, napi_weight; 3000 bool update_napi = false; 3001 3002 /* Can't change NAPI weight if the link is up */ 3003 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 3004 if (napi_weight ^ vi->sq[0].napi.weight) { 3005 if (dev->flags & IFF_UP) 3006 return -EBUSY; 3007 else 3008 update_napi = true; 3009 } 3010 3011 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) 3012 ret = virtnet_send_notf_coal_cmds(vi, ec); 3013 else 3014 ret = virtnet_coal_params_supported(ec); 3015 3016 if (ret) 3017 return ret; 3018 3019 if (update_napi) { 3020 for (i = 0; i < vi->max_queue_pairs; i++) 3021 vi->sq[i].napi.weight = napi_weight; 3022 } 3023 3024 return ret; 3025 } 3026 3027 static int virtnet_get_coalesce(struct net_device *dev, 3028 struct ethtool_coalesce *ec, 3029 struct kernel_ethtool_coalesce *kernel_coal, 3030 struct netlink_ext_ack *extack) 3031 { 3032 struct virtnet_info *vi = netdev_priv(dev); 3033 3034 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 3035 ec->rx_coalesce_usecs = vi->rx_usecs; 3036 ec->tx_coalesce_usecs = vi->tx_usecs; 3037 ec->tx_max_coalesced_frames = vi->tx_max_packets; 3038 ec->rx_max_coalesced_frames = vi->rx_max_packets; 3039 } else { 3040 ec->rx_max_coalesced_frames = 1; 3041 3042 if (vi->sq[0].napi.weight) 3043 ec->tx_max_coalesced_frames = 1; 3044 } 3045 3046 return 0; 3047 } 3048 3049 static void virtnet_init_settings(struct net_device *dev) 3050 { 3051 struct virtnet_info *vi = netdev_priv(dev); 3052 3053 vi->speed = SPEED_UNKNOWN; 3054 vi->duplex = DUPLEX_UNKNOWN; 3055 } 3056 3057 static void virtnet_update_settings(struct virtnet_info *vi) 3058 { 3059 u32 speed; 3060 u8 duplex; 3061 3062 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 3063 return; 3064 3065 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); 3066 3067 if (ethtool_validate_speed(speed)) 3068 vi->speed = speed; 3069 3070 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); 3071 3072 if (ethtool_validate_duplex(duplex)) 3073 vi->duplex = duplex; 3074 } 3075 3076 static u32 virtnet_get_rxfh_key_size(struct net_device *dev) 3077 { 3078 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; 3079 } 3080 3081 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) 3082 { 3083 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; 3084 } 3085 3086 static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) 3087 { 3088 struct virtnet_info *vi = netdev_priv(dev); 3089 int i; 3090 3091 if (indir) { 3092 for (i = 0; i < vi->rss_indir_table_size; ++i) 3093 indir[i] = vi->ctrl->rss.indirection_table[i]; 3094 } 3095 3096 if (key) 3097 memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); 3098 3099 if (hfunc) 3100 *hfunc = ETH_RSS_HASH_TOP; 3101 3102 return 0; 3103 } 3104 3105 static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) 3106 { 3107 struct virtnet_info *vi = netdev_priv(dev); 3108 int i; 3109 3110 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) 3111 return -EOPNOTSUPP; 3112 3113 if (indir) { 3114 for (i = 0; i < vi->rss_indir_table_size; ++i) 3115 vi->ctrl->rss.indirection_table[i] = indir[i]; 3116 } 3117 if (key) 3118 memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); 3119 3120 virtnet_commit_rss_command(vi); 3121 3122 return 0; 3123 } 3124 3125 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) 3126 { 3127 struct virtnet_info *vi = netdev_priv(dev); 3128 int rc = 0; 3129 3130 switch (info->cmd) { 3131 case ETHTOOL_GRXRINGS: 3132 info->data = vi->curr_queue_pairs; 3133 break; 3134 case ETHTOOL_GRXFH: 3135 virtnet_get_hashflow(vi, info); 3136 break; 3137 default: 3138 rc = -EOPNOTSUPP; 3139 } 3140 3141 return rc; 3142 } 3143 3144 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) 3145 { 3146 struct virtnet_info *vi = netdev_priv(dev); 3147 int rc = 0; 3148 3149 switch (info->cmd) { 3150 case ETHTOOL_SRXFH: 3151 if (!virtnet_set_hashflow(vi, info)) 3152 rc = -EINVAL; 3153 3154 break; 3155 default: 3156 rc = -EOPNOTSUPP; 3157 } 3158 3159 return rc; 3160 } 3161 3162 static const struct ethtool_ops virtnet_ethtool_ops = { 3163 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | 3164 ETHTOOL_COALESCE_USECS, 3165 .get_drvinfo = virtnet_get_drvinfo, 3166 .get_link = ethtool_op_get_link, 3167 .get_ringparam = virtnet_get_ringparam, 3168 .set_ringparam = virtnet_set_ringparam, 3169 .get_strings = virtnet_get_strings, 3170 .get_sset_count = virtnet_get_sset_count, 3171 .get_ethtool_stats = virtnet_get_ethtool_stats, 3172 .set_channels = virtnet_set_channels, 3173 .get_channels = virtnet_get_channels, 3174 .get_ts_info = ethtool_op_get_ts_info, 3175 .get_link_ksettings = virtnet_get_link_ksettings, 3176 .set_link_ksettings = virtnet_set_link_ksettings, 3177 .set_coalesce = virtnet_set_coalesce, 3178 .get_coalesce = virtnet_get_coalesce, 3179 .get_rxfh_key_size = virtnet_get_rxfh_key_size, 3180 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, 3181 .get_rxfh = virtnet_get_rxfh, 3182 .set_rxfh = virtnet_set_rxfh, 3183 .get_rxnfc = virtnet_get_rxnfc, 3184 .set_rxnfc = virtnet_set_rxnfc, 3185 }; 3186 3187 static void virtnet_freeze_down(struct virtio_device *vdev) 3188 { 3189 struct virtnet_info *vi = vdev->priv; 3190 3191 /* Make sure no work handler is accessing the device */ 3192 flush_work(&vi->config_work); 3193 3194 netif_tx_lock_bh(vi->dev); 3195 netif_device_detach(vi->dev); 3196 netif_tx_unlock_bh(vi->dev); 3197 if (netif_running(vi->dev)) 3198 virtnet_close(vi->dev); 3199 } 3200 3201 static int init_vqs(struct virtnet_info *vi); 3202 3203 static int virtnet_restore_up(struct virtio_device *vdev) 3204 { 3205 struct virtnet_info *vi = vdev->priv; 3206 int err; 3207 3208 err = init_vqs(vi); 3209 if (err) 3210 return err; 3211 3212 virtio_device_ready(vdev); 3213 3214 enable_delayed_refill(vi); 3215 3216 if (netif_running(vi->dev)) { 3217 err = virtnet_open(vi->dev); 3218 if (err) 3219 return err; 3220 } 3221 3222 netif_tx_lock_bh(vi->dev); 3223 netif_device_attach(vi->dev); 3224 netif_tx_unlock_bh(vi->dev); 3225 return err; 3226 } 3227 3228 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 3229 { 3230 struct scatterlist sg; 3231 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 3232 3233 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 3234 3235 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 3236 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 3237 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); 3238 return -EINVAL; 3239 } 3240 3241 return 0; 3242 } 3243 3244 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 3245 { 3246 u64 offloads = 0; 3247 3248 if (!vi->guest_offloads) 3249 return 0; 3250 3251 return virtnet_set_guest_offloads(vi, offloads); 3252 } 3253 3254 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 3255 { 3256 u64 offloads = vi->guest_offloads; 3257 3258 if (!vi->guest_offloads) 3259 return 0; 3260 3261 return virtnet_set_guest_offloads(vi, offloads); 3262 } 3263 3264 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 3265 struct netlink_ext_ack *extack) 3266 { 3267 unsigned int room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 3268 sizeof(struct skb_shared_info)); 3269 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN; 3270 struct virtnet_info *vi = netdev_priv(dev); 3271 struct bpf_prog *old_prog; 3272 u16 xdp_qp = 0, curr_qp; 3273 int i, err; 3274 3275 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 3276 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3277 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3278 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3279 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3280 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) || 3281 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) || 3282 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) { 3283 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first"); 3284 return -EOPNOTSUPP; 3285 } 3286 3287 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 3288 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 3289 return -EINVAL; 3290 } 3291 3292 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) { 3293 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags"); 3294 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz); 3295 return -EINVAL; 3296 } 3297 3298 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 3299 if (prog) 3300 xdp_qp = nr_cpu_ids; 3301 3302 /* XDP requires extra queues for XDP_TX */ 3303 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 3304 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", 3305 curr_qp + xdp_qp, vi->max_queue_pairs); 3306 xdp_qp = 0; 3307 } 3308 3309 old_prog = rtnl_dereference(vi->rq[0].xdp_prog); 3310 if (!prog && !old_prog) 3311 return 0; 3312 3313 if (prog) 3314 bpf_prog_add(prog, vi->max_queue_pairs - 1); 3315 3316 /* Make sure NAPI is not using any XDP TX queues for RX. */ 3317 if (netif_running(dev)) { 3318 for (i = 0; i < vi->max_queue_pairs; i++) { 3319 napi_disable(&vi->rq[i].napi); 3320 virtnet_napi_tx_disable(&vi->sq[i].napi); 3321 } 3322 } 3323 3324 if (!prog) { 3325 for (i = 0; i < vi->max_queue_pairs; i++) { 3326 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3327 if (i == 0) 3328 virtnet_restore_guest_offloads(vi); 3329 } 3330 synchronize_net(); 3331 } 3332 3333 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 3334 if (err) 3335 goto err; 3336 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 3337 vi->xdp_queue_pairs = xdp_qp; 3338 3339 if (prog) { 3340 vi->xdp_enabled = true; 3341 for (i = 0; i < vi->max_queue_pairs; i++) { 3342 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3343 if (i == 0 && !old_prog) 3344 virtnet_clear_guest_offloads(vi); 3345 } 3346 if (!old_prog) 3347 xdp_features_set_redirect_target(dev, true); 3348 } else { 3349 xdp_features_clear_redirect_target(dev); 3350 vi->xdp_enabled = false; 3351 } 3352 3353 for (i = 0; i < vi->max_queue_pairs; i++) { 3354 if (old_prog) 3355 bpf_prog_put(old_prog); 3356 if (netif_running(dev)) { 3357 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3358 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3359 &vi->sq[i].napi); 3360 } 3361 } 3362 3363 return 0; 3364 3365 err: 3366 if (!prog) { 3367 virtnet_clear_guest_offloads(vi); 3368 for (i = 0; i < vi->max_queue_pairs; i++) 3369 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); 3370 } 3371 3372 if (netif_running(dev)) { 3373 for (i = 0; i < vi->max_queue_pairs; i++) { 3374 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3375 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3376 &vi->sq[i].napi); 3377 } 3378 } 3379 if (prog) 3380 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 3381 return err; 3382 } 3383 3384 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 3385 { 3386 switch (xdp->command) { 3387 case XDP_SETUP_PROG: 3388 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 3389 default: 3390 return -EINVAL; 3391 } 3392 } 3393 3394 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 3395 size_t len) 3396 { 3397 struct virtnet_info *vi = netdev_priv(dev); 3398 int ret; 3399 3400 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 3401 return -EOPNOTSUPP; 3402 3403 ret = snprintf(buf, len, "sby"); 3404 if (ret >= len) 3405 return -EOPNOTSUPP; 3406 3407 return 0; 3408 } 3409 3410 static int virtnet_set_features(struct net_device *dev, 3411 netdev_features_t features) 3412 { 3413 struct virtnet_info *vi = netdev_priv(dev); 3414 u64 offloads; 3415 int err; 3416 3417 if ((dev->features ^ features) & NETIF_F_GRO_HW) { 3418 if (vi->xdp_enabled) 3419 return -EBUSY; 3420 3421 if (features & NETIF_F_GRO_HW) 3422 offloads = vi->guest_offloads_capable; 3423 else 3424 offloads = vi->guest_offloads_capable & 3425 ~GUEST_OFFLOAD_GRO_HW_MASK; 3426 3427 err = virtnet_set_guest_offloads(vi, offloads); 3428 if (err) 3429 return err; 3430 vi->guest_offloads = offloads; 3431 } 3432 3433 if ((dev->features ^ features) & NETIF_F_RXHASH) { 3434 if (features & NETIF_F_RXHASH) 3435 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 3436 else 3437 vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; 3438 3439 if (!virtnet_commit_rss_command(vi)) 3440 return -EINVAL; 3441 } 3442 3443 return 0; 3444 } 3445 3446 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue) 3447 { 3448 struct virtnet_info *priv = netdev_priv(dev); 3449 struct send_queue *sq = &priv->sq[txqueue]; 3450 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue); 3451 3452 u64_stats_update_begin(&sq->stats.syncp); 3453 sq->stats.tx_timeouts++; 3454 u64_stats_update_end(&sq->stats.syncp); 3455 3456 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n", 3457 txqueue, sq->name, sq->vq->index, sq->vq->name, 3458 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start))); 3459 } 3460 3461 static const struct net_device_ops virtnet_netdev = { 3462 .ndo_open = virtnet_open, 3463 .ndo_stop = virtnet_close, 3464 .ndo_start_xmit = start_xmit, 3465 .ndo_validate_addr = eth_validate_addr, 3466 .ndo_set_mac_address = virtnet_set_mac_address, 3467 .ndo_set_rx_mode = virtnet_set_rx_mode, 3468 .ndo_get_stats64 = virtnet_stats, 3469 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 3470 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 3471 .ndo_bpf = virtnet_xdp, 3472 .ndo_xdp_xmit = virtnet_xdp_xmit, 3473 .ndo_features_check = passthru_features_check, 3474 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 3475 .ndo_set_features = virtnet_set_features, 3476 .ndo_tx_timeout = virtnet_tx_timeout, 3477 }; 3478 3479 static void virtnet_config_changed_work(struct work_struct *work) 3480 { 3481 struct virtnet_info *vi = 3482 container_of(work, struct virtnet_info, config_work); 3483 u16 v; 3484 3485 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 3486 struct virtio_net_config, status, &v) < 0) 3487 return; 3488 3489 if (v & VIRTIO_NET_S_ANNOUNCE) { 3490 netdev_notify_peers(vi->dev); 3491 virtnet_ack_link_announce(vi); 3492 } 3493 3494 /* Ignore unknown (future) status bits */ 3495 v &= VIRTIO_NET_S_LINK_UP; 3496 3497 if (vi->status == v) 3498 return; 3499 3500 vi->status = v; 3501 3502 if (vi->status & VIRTIO_NET_S_LINK_UP) { 3503 virtnet_update_settings(vi); 3504 netif_carrier_on(vi->dev); 3505 netif_tx_wake_all_queues(vi->dev); 3506 } else { 3507 netif_carrier_off(vi->dev); 3508 netif_tx_stop_all_queues(vi->dev); 3509 } 3510 } 3511 3512 static void virtnet_config_changed(struct virtio_device *vdev) 3513 { 3514 struct virtnet_info *vi = vdev->priv; 3515 3516 schedule_work(&vi->config_work); 3517 } 3518 3519 static void virtnet_free_queues(struct virtnet_info *vi) 3520 { 3521 int i; 3522 3523 for (i = 0; i < vi->max_queue_pairs; i++) { 3524 __netif_napi_del(&vi->rq[i].napi); 3525 __netif_napi_del(&vi->sq[i].napi); 3526 } 3527 3528 /* We called __netif_napi_del(), 3529 * we need to respect an RCU grace period before freeing vi->rq 3530 */ 3531 synchronize_net(); 3532 3533 kfree(vi->rq); 3534 kfree(vi->sq); 3535 kfree(vi->ctrl); 3536 } 3537 3538 static void _free_receive_bufs(struct virtnet_info *vi) 3539 { 3540 struct bpf_prog *old_prog; 3541 int i; 3542 3543 for (i = 0; i < vi->max_queue_pairs; i++) { 3544 while (vi->rq[i].pages) 3545 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 3546 3547 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 3548 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 3549 if (old_prog) 3550 bpf_prog_put(old_prog); 3551 } 3552 } 3553 3554 static void free_receive_bufs(struct virtnet_info *vi) 3555 { 3556 rtnl_lock(); 3557 _free_receive_bufs(vi); 3558 rtnl_unlock(); 3559 } 3560 3561 static void free_receive_page_frags(struct virtnet_info *vi) 3562 { 3563 int i; 3564 for (i = 0; i < vi->max_queue_pairs; i++) 3565 if (vi->rq[i].alloc_frag.page) 3566 put_page(vi->rq[i].alloc_frag.page); 3567 } 3568 3569 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) 3570 { 3571 if (!is_xdp_frame(buf)) 3572 dev_kfree_skb(buf); 3573 else 3574 xdp_return_frame(ptr_to_xdp(buf)); 3575 } 3576 3577 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf) 3578 { 3579 struct virtnet_info *vi = vq->vdev->priv; 3580 int i = vq2rxq(vq); 3581 3582 if (vi->mergeable_rx_bufs) 3583 put_page(virt_to_head_page(buf)); 3584 else if (vi->big_packets) 3585 give_pages(&vi->rq[i], buf); 3586 else 3587 put_page(virt_to_head_page(buf)); 3588 } 3589 3590 static void free_unused_bufs(struct virtnet_info *vi) 3591 { 3592 void *buf; 3593 int i; 3594 3595 for (i = 0; i < vi->max_queue_pairs; i++) { 3596 struct virtqueue *vq = vi->sq[i].vq; 3597 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3598 virtnet_sq_free_unused_buf(vq, buf); 3599 cond_resched(); 3600 } 3601 3602 for (i = 0; i < vi->max_queue_pairs; i++) { 3603 struct virtqueue *vq = vi->rq[i].vq; 3604 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3605 virtnet_rq_free_unused_buf(vq, buf); 3606 cond_resched(); 3607 } 3608 } 3609 3610 static void virtnet_del_vqs(struct virtnet_info *vi) 3611 { 3612 struct virtio_device *vdev = vi->vdev; 3613 3614 virtnet_clean_affinity(vi); 3615 3616 vdev->config->del_vqs(vdev); 3617 3618 virtnet_free_queues(vi); 3619 } 3620 3621 /* How large should a single buffer be so a queue full of these can fit at 3622 * least one full packet? 3623 * Logic below assumes the mergeable buffer header is used. 3624 */ 3625 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 3626 { 3627 const unsigned int hdr_len = vi->hdr_len; 3628 unsigned int rq_size = virtqueue_get_vring_size(vq); 3629 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 3630 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 3631 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 3632 3633 return max(max(min_buf_len, hdr_len) - hdr_len, 3634 (unsigned int)GOOD_PACKET_LEN); 3635 } 3636 3637 static int virtnet_find_vqs(struct virtnet_info *vi) 3638 { 3639 vq_callback_t **callbacks; 3640 struct virtqueue **vqs; 3641 int ret = -ENOMEM; 3642 int i, total_vqs; 3643 const char **names; 3644 bool *ctx; 3645 3646 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 3647 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 3648 * possible control vq. 3649 */ 3650 total_vqs = vi->max_queue_pairs * 2 + 3651 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 3652 3653 /* Allocate space for find_vqs parameters */ 3654 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 3655 if (!vqs) 3656 goto err_vq; 3657 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 3658 if (!callbacks) 3659 goto err_callback; 3660 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 3661 if (!names) 3662 goto err_names; 3663 if (!vi->big_packets || vi->mergeable_rx_bufs) { 3664 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 3665 if (!ctx) 3666 goto err_ctx; 3667 } else { 3668 ctx = NULL; 3669 } 3670 3671 /* Parameters for control virtqueue, if any */ 3672 if (vi->has_cvq) { 3673 callbacks[total_vqs - 1] = NULL; 3674 names[total_vqs - 1] = "control"; 3675 } 3676 3677 /* Allocate/initialize parameters for send/receive virtqueues */ 3678 for (i = 0; i < vi->max_queue_pairs; i++) { 3679 callbacks[rxq2vq(i)] = skb_recv_done; 3680 callbacks[txq2vq(i)] = skb_xmit_done; 3681 sprintf(vi->rq[i].name, "input.%d", i); 3682 sprintf(vi->sq[i].name, "output.%d", i); 3683 names[rxq2vq(i)] = vi->rq[i].name; 3684 names[txq2vq(i)] = vi->sq[i].name; 3685 if (ctx) 3686 ctx[rxq2vq(i)] = true; 3687 } 3688 3689 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, 3690 names, ctx, NULL); 3691 if (ret) 3692 goto err_find; 3693 3694 if (vi->has_cvq) { 3695 vi->cvq = vqs[total_vqs - 1]; 3696 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 3697 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 3698 } 3699 3700 for (i = 0; i < vi->max_queue_pairs; i++) { 3701 vi->rq[i].vq = vqs[rxq2vq(i)]; 3702 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 3703 vi->sq[i].vq = vqs[txq2vq(i)]; 3704 } 3705 3706 /* run here: ret == 0. */ 3707 3708 3709 err_find: 3710 kfree(ctx); 3711 err_ctx: 3712 kfree(names); 3713 err_names: 3714 kfree(callbacks); 3715 err_callback: 3716 kfree(vqs); 3717 err_vq: 3718 return ret; 3719 } 3720 3721 static int virtnet_alloc_queues(struct virtnet_info *vi) 3722 { 3723 int i; 3724 3725 if (vi->has_cvq) { 3726 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 3727 if (!vi->ctrl) 3728 goto err_ctrl; 3729 } else { 3730 vi->ctrl = NULL; 3731 } 3732 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 3733 if (!vi->sq) 3734 goto err_sq; 3735 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 3736 if (!vi->rq) 3737 goto err_rq; 3738 3739 INIT_DELAYED_WORK(&vi->refill, refill_work); 3740 for (i = 0; i < vi->max_queue_pairs; i++) { 3741 vi->rq[i].pages = NULL; 3742 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll, 3743 napi_weight); 3744 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi, 3745 virtnet_poll_tx, 3746 napi_tx ? napi_weight : 0); 3747 3748 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 3749 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 3750 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 3751 3752 u64_stats_init(&vi->rq[i].stats.syncp); 3753 u64_stats_init(&vi->sq[i].stats.syncp); 3754 } 3755 3756 return 0; 3757 3758 err_rq: 3759 kfree(vi->sq); 3760 err_sq: 3761 kfree(vi->ctrl); 3762 err_ctrl: 3763 return -ENOMEM; 3764 } 3765 3766 static int init_vqs(struct virtnet_info *vi) 3767 { 3768 int ret; 3769 3770 /* Allocate send & receive queues */ 3771 ret = virtnet_alloc_queues(vi); 3772 if (ret) 3773 goto err; 3774 3775 ret = virtnet_find_vqs(vi); 3776 if (ret) 3777 goto err_free; 3778 3779 cpus_read_lock(); 3780 virtnet_set_affinity(vi); 3781 cpus_read_unlock(); 3782 3783 return 0; 3784 3785 err_free: 3786 virtnet_free_queues(vi); 3787 err: 3788 return ret; 3789 } 3790 3791 #ifdef CONFIG_SYSFS 3792 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 3793 char *buf) 3794 { 3795 struct virtnet_info *vi = netdev_priv(queue->dev); 3796 unsigned int queue_index = get_netdev_rx_queue_index(queue); 3797 unsigned int headroom = virtnet_get_headroom(vi); 3798 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 3799 struct ewma_pkt_len *avg; 3800 3801 BUG_ON(queue_index >= vi->max_queue_pairs); 3802 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 3803 return sprintf(buf, "%u\n", 3804 get_mergeable_buf_len(&vi->rq[queue_index], avg, 3805 SKB_DATA_ALIGN(headroom + tailroom))); 3806 } 3807 3808 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 3809 __ATTR_RO(mergeable_rx_buffer_size); 3810 3811 static struct attribute *virtio_net_mrg_rx_attrs[] = { 3812 &mergeable_rx_buffer_size_attribute.attr, 3813 NULL 3814 }; 3815 3816 static const struct attribute_group virtio_net_mrg_rx_group = { 3817 .name = "virtio_net", 3818 .attrs = virtio_net_mrg_rx_attrs 3819 }; 3820 #endif 3821 3822 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 3823 unsigned int fbit, 3824 const char *fname, const char *dname) 3825 { 3826 if (!virtio_has_feature(vdev, fbit)) 3827 return false; 3828 3829 dev_err(&vdev->dev, "device advertises feature %s but not %s", 3830 fname, dname); 3831 3832 return true; 3833 } 3834 3835 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 3836 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 3837 3838 static bool virtnet_validate_features(struct virtio_device *vdev) 3839 { 3840 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 3841 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 3842 "VIRTIO_NET_F_CTRL_VQ") || 3843 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 3844 "VIRTIO_NET_F_CTRL_VQ") || 3845 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 3846 "VIRTIO_NET_F_CTRL_VQ") || 3847 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 3848 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 3849 "VIRTIO_NET_F_CTRL_VQ") || 3850 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, 3851 "VIRTIO_NET_F_CTRL_VQ") || 3852 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT, 3853 "VIRTIO_NET_F_CTRL_VQ") || 3854 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL, 3855 "VIRTIO_NET_F_CTRL_VQ"))) { 3856 return false; 3857 } 3858 3859 return true; 3860 } 3861 3862 #define MIN_MTU ETH_MIN_MTU 3863 #define MAX_MTU ETH_MAX_MTU 3864 3865 static int virtnet_validate(struct virtio_device *vdev) 3866 { 3867 if (!vdev->config->get) { 3868 dev_err(&vdev->dev, "%s failure: config access disabled\n", 3869 __func__); 3870 return -EINVAL; 3871 } 3872 3873 if (!virtnet_validate_features(vdev)) 3874 return -EINVAL; 3875 3876 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3877 int mtu = virtio_cread16(vdev, 3878 offsetof(struct virtio_net_config, 3879 mtu)); 3880 if (mtu < MIN_MTU) 3881 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 3882 } 3883 3884 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) && 3885 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3886 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby"); 3887 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY); 3888 } 3889 3890 return 0; 3891 } 3892 3893 static bool virtnet_check_guest_gso(const struct virtnet_info *vi) 3894 { 3895 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3896 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3897 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3898 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3899 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) && 3900 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6)); 3901 } 3902 3903 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu) 3904 { 3905 bool guest_gso = virtnet_check_guest_gso(vi); 3906 3907 /* If device can receive ANY guest GSO packets, regardless of mtu, 3908 * allocate packets of maximum size, otherwise limit it to only 3909 * mtu size worth only. 3910 */ 3911 if (mtu > ETH_DATA_LEN || guest_gso) { 3912 vi->big_packets = true; 3913 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE); 3914 } 3915 } 3916 3917 static int virtnet_probe(struct virtio_device *vdev) 3918 { 3919 int i, err = -ENOMEM; 3920 struct net_device *dev; 3921 struct virtnet_info *vi; 3922 u16 max_queue_pairs; 3923 int mtu = 0; 3924 3925 /* Find if host supports multiqueue/rss virtio_net device */ 3926 max_queue_pairs = 1; 3927 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 3928 max_queue_pairs = 3929 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs)); 3930 3931 /* We need at least 2 queue's */ 3932 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 3933 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 3934 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 3935 max_queue_pairs = 1; 3936 3937 /* Allocate ourselves a network device with room for our info */ 3938 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 3939 if (!dev) 3940 return -ENOMEM; 3941 3942 /* Set up network device as normal. */ 3943 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE | 3944 IFF_TX_SKB_NO_LINEAR; 3945 dev->netdev_ops = &virtnet_netdev; 3946 dev->features = NETIF_F_HIGHDMA; 3947 3948 dev->ethtool_ops = &virtnet_ethtool_ops; 3949 SET_NETDEV_DEV(dev, &vdev->dev); 3950 3951 /* Do we support "hardware" checksums? */ 3952 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 3953 /* This opens up the world of extra features. */ 3954 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3955 if (csum) 3956 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 3957 3958 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 3959 dev->hw_features |= NETIF_F_TSO 3960 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 3961 } 3962 /* Individual feature bits: what can host handle? */ 3963 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 3964 dev->hw_features |= NETIF_F_TSO; 3965 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 3966 dev->hw_features |= NETIF_F_TSO6; 3967 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 3968 dev->hw_features |= NETIF_F_TSO_ECN; 3969 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO)) 3970 dev->hw_features |= NETIF_F_GSO_UDP_L4; 3971 3972 dev->features |= NETIF_F_GSO_ROBUST; 3973 3974 if (gso) 3975 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 3976 /* (!csum && gso) case will be fixed by register_netdev() */ 3977 } 3978 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 3979 dev->features |= NETIF_F_RXCSUM; 3980 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 3981 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 3982 dev->features |= NETIF_F_GRO_HW; 3983 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 3984 dev->hw_features |= NETIF_F_GRO_HW; 3985 3986 dev->vlan_features = dev->features; 3987 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT; 3988 3989 /* MTU range: 68 - 65535 */ 3990 dev->min_mtu = MIN_MTU; 3991 dev->max_mtu = MAX_MTU; 3992 3993 /* Configuration may specify what MAC to use. Otherwise random. */ 3994 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3995 u8 addr[ETH_ALEN]; 3996 3997 virtio_cread_bytes(vdev, 3998 offsetof(struct virtio_net_config, mac), 3999 addr, ETH_ALEN); 4000 eth_hw_addr_set(dev, addr); 4001 } else { 4002 eth_hw_addr_random(dev); 4003 dev_info(&vdev->dev, "Assigned random MAC address %pM\n", 4004 dev->dev_addr); 4005 } 4006 4007 /* Set up our device-specific information */ 4008 vi = netdev_priv(dev); 4009 vi->dev = dev; 4010 vi->vdev = vdev; 4011 vdev->priv = vi; 4012 4013 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 4014 spin_lock_init(&vi->refill_lock); 4015 4016 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { 4017 vi->mergeable_rx_bufs = true; 4018 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG; 4019 } 4020 4021 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 4022 vi->rx_usecs = 0; 4023 vi->tx_usecs = 0; 4024 vi->tx_max_packets = 0; 4025 vi->rx_max_packets = 0; 4026 } 4027 4028 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) 4029 vi->has_rss_hash_report = true; 4030 4031 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 4032 vi->has_rss = true; 4033 4034 if (vi->has_rss || vi->has_rss_hash_report) { 4035 vi->rss_indir_table_size = 4036 virtio_cread16(vdev, offsetof(struct virtio_net_config, 4037 rss_max_indirection_table_length)); 4038 vi->rss_key_size = 4039 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); 4040 4041 vi->rss_hash_types_supported = 4042 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); 4043 vi->rss_hash_types_supported &= 4044 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | 4045 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | 4046 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); 4047 4048 dev->hw_features |= NETIF_F_RXHASH; 4049 } 4050 4051 if (vi->has_rss_hash_report) 4052 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash); 4053 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 4054 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4055 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 4056 else 4057 vi->hdr_len = sizeof(struct virtio_net_hdr); 4058 4059 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 4060 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4061 vi->any_header_sg = true; 4062 4063 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 4064 vi->has_cvq = true; 4065 4066 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 4067 mtu = virtio_cread16(vdev, 4068 offsetof(struct virtio_net_config, 4069 mtu)); 4070 if (mtu < dev->min_mtu) { 4071 /* Should never trigger: MTU was previously validated 4072 * in virtnet_validate. 4073 */ 4074 dev_err(&vdev->dev, 4075 "device MTU appears to have changed it is now %d < %d", 4076 mtu, dev->min_mtu); 4077 err = -EINVAL; 4078 goto free; 4079 } 4080 4081 dev->mtu = mtu; 4082 dev->max_mtu = mtu; 4083 } 4084 4085 virtnet_set_big_packets(vi, mtu); 4086 4087 if (vi->any_header_sg) 4088 dev->needed_headroom = vi->hdr_len; 4089 4090 /* Enable multiqueue by default */ 4091 if (num_online_cpus() >= max_queue_pairs) 4092 vi->curr_queue_pairs = max_queue_pairs; 4093 else 4094 vi->curr_queue_pairs = num_online_cpus(); 4095 vi->max_queue_pairs = max_queue_pairs; 4096 4097 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 4098 err = init_vqs(vi); 4099 if (err) 4100 goto free; 4101 4102 #ifdef CONFIG_SYSFS 4103 if (vi->mergeable_rx_bufs) 4104 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 4105 #endif 4106 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 4107 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 4108 4109 virtnet_init_settings(dev); 4110 4111 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 4112 vi->failover = net_failover_create(vi->dev); 4113 if (IS_ERR(vi->failover)) { 4114 err = PTR_ERR(vi->failover); 4115 goto free_vqs; 4116 } 4117 } 4118 4119 if (vi->has_rss || vi->has_rss_hash_report) 4120 virtnet_init_default_rss(vi); 4121 4122 /* serialize netdev register + virtio_device_ready() with ndo_open() */ 4123 rtnl_lock(); 4124 4125 err = register_netdevice(dev); 4126 if (err) { 4127 pr_debug("virtio_net: registering device failed\n"); 4128 rtnl_unlock(); 4129 goto free_failover; 4130 } 4131 4132 virtio_device_ready(vdev); 4133 4134 /* a random MAC address has been assigned, notify the device. 4135 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there 4136 * because many devices work fine without getting MAC explicitly 4137 */ 4138 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 4139 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 4140 struct scatterlist sg; 4141 4142 sg_init_one(&sg, dev->dev_addr, dev->addr_len); 4143 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 4144 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 4145 pr_debug("virtio_net: setting MAC address failed\n"); 4146 rtnl_unlock(); 4147 err = -EINVAL; 4148 goto free_unregister_netdev; 4149 } 4150 } 4151 4152 rtnl_unlock(); 4153 4154 err = virtnet_cpu_notif_add(vi); 4155 if (err) { 4156 pr_debug("virtio_net: registering cpu notifier failed\n"); 4157 goto free_unregister_netdev; 4158 } 4159 4160 virtnet_set_queues(vi, vi->curr_queue_pairs); 4161 4162 /* Assume link up if device can't report link status, 4163 otherwise get link status from config. */ 4164 netif_carrier_off(dev); 4165 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 4166 schedule_work(&vi->config_work); 4167 } else { 4168 vi->status = VIRTIO_NET_S_LINK_UP; 4169 virtnet_update_settings(vi); 4170 netif_carrier_on(dev); 4171 } 4172 4173 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 4174 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 4175 set_bit(guest_offloads[i], &vi->guest_offloads); 4176 vi->guest_offloads_capable = vi->guest_offloads; 4177 4178 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 4179 dev->name, max_queue_pairs); 4180 4181 return 0; 4182 4183 free_unregister_netdev: 4184 unregister_netdev(dev); 4185 free_failover: 4186 net_failover_destroy(vi->failover); 4187 free_vqs: 4188 virtio_reset_device(vdev); 4189 cancel_delayed_work_sync(&vi->refill); 4190 free_receive_page_frags(vi); 4191 virtnet_del_vqs(vi); 4192 free: 4193 free_netdev(dev); 4194 return err; 4195 } 4196 4197 static void remove_vq_common(struct virtnet_info *vi) 4198 { 4199 virtio_reset_device(vi->vdev); 4200 4201 /* Free unused buffers in both send and recv, if any. */ 4202 free_unused_bufs(vi); 4203 4204 free_receive_bufs(vi); 4205 4206 free_receive_page_frags(vi); 4207 4208 virtnet_del_vqs(vi); 4209 } 4210 4211 static void virtnet_remove(struct virtio_device *vdev) 4212 { 4213 struct virtnet_info *vi = vdev->priv; 4214 4215 virtnet_cpu_notif_remove(vi); 4216 4217 /* Make sure no work handler is accessing the device. */ 4218 flush_work(&vi->config_work); 4219 4220 unregister_netdev(vi->dev); 4221 4222 net_failover_destroy(vi->failover); 4223 4224 remove_vq_common(vi); 4225 4226 free_netdev(vi->dev); 4227 } 4228 4229 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 4230 { 4231 struct virtnet_info *vi = vdev->priv; 4232 4233 virtnet_cpu_notif_remove(vi); 4234 virtnet_freeze_down(vdev); 4235 remove_vq_common(vi); 4236 4237 return 0; 4238 } 4239 4240 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 4241 { 4242 struct virtnet_info *vi = vdev->priv; 4243 int err; 4244 4245 err = virtnet_restore_up(vdev); 4246 if (err) 4247 return err; 4248 virtnet_set_queues(vi, vi->curr_queue_pairs); 4249 4250 err = virtnet_cpu_notif_add(vi); 4251 if (err) { 4252 virtnet_freeze_down(vdev); 4253 remove_vq_common(vi); 4254 return err; 4255 } 4256 4257 return 0; 4258 } 4259 4260 static struct virtio_device_id id_table[] = { 4261 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 4262 { 0 }, 4263 }; 4264 4265 #define VIRTNET_FEATURES \ 4266 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 4267 VIRTIO_NET_F_MAC, \ 4268 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 4269 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 4270 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 4271 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \ 4272 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 4273 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 4274 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 4275 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 4276 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 4277 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \ 4278 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \ 4279 VIRTIO_NET_F_GUEST_HDRLEN 4280 4281 static unsigned int features[] = { 4282 VIRTNET_FEATURES, 4283 }; 4284 4285 static unsigned int features_legacy[] = { 4286 VIRTNET_FEATURES, 4287 VIRTIO_NET_F_GSO, 4288 VIRTIO_F_ANY_LAYOUT, 4289 }; 4290 4291 static struct virtio_driver virtio_net_driver = { 4292 .feature_table = features, 4293 .feature_table_size = ARRAY_SIZE(features), 4294 .feature_table_legacy = features_legacy, 4295 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 4296 .driver.name = KBUILD_MODNAME, 4297 .driver.owner = THIS_MODULE, 4298 .id_table = id_table, 4299 .validate = virtnet_validate, 4300 .probe = virtnet_probe, 4301 .remove = virtnet_remove, 4302 .config_changed = virtnet_config_changed, 4303 #ifdef CONFIG_PM_SLEEP 4304 .freeze = virtnet_freeze, 4305 .restore = virtnet_restore, 4306 #endif 4307 }; 4308 4309 static __init int virtio_net_driver_init(void) 4310 { 4311 int ret; 4312 4313 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 4314 virtnet_cpu_online, 4315 virtnet_cpu_down_prep); 4316 if (ret < 0) 4317 goto out; 4318 virtionet_online = ret; 4319 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 4320 NULL, virtnet_cpu_dead); 4321 if (ret) 4322 goto err_dead; 4323 ret = register_virtio_driver(&virtio_net_driver); 4324 if (ret) 4325 goto err_virtio; 4326 return 0; 4327 err_virtio: 4328 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4329 err_dead: 4330 cpuhp_remove_multi_state(virtionet_online); 4331 out: 4332 return ret; 4333 } 4334 module_init(virtio_net_driver_init); 4335 4336 static __exit void virtio_net_driver_exit(void) 4337 { 4338 unregister_virtio_driver(&virtio_net_driver); 4339 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4340 cpuhp_remove_multi_state(virtionet_online); 4341 } 4342 module_exit(virtio_net_driver_exit); 4343 4344 MODULE_DEVICE_TABLE(virtio, id_table); 4345 MODULE_DESCRIPTION("Virtio network driver"); 4346 MODULE_LICENSE("GPL"); 4347