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 #include <net/netdev_rx_queue.h> 26 27 static int napi_weight = NAPI_POLL_WEIGHT; 28 module_param(napi_weight, int, 0444); 29 30 static bool csum = true, gso = true, napi_tx = true; 31 module_param(csum, bool, 0444); 32 module_param(gso, bool, 0444); 33 module_param(napi_tx, bool, 0644); 34 35 /* FIXME: MTU in config. */ 36 #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) 37 #define GOOD_COPY_LEN 128 38 39 #define VIRTNET_RX_PAD (NET_IP_ALIGN + NET_SKB_PAD) 40 41 /* Amount of XDP headroom to prepend to packets for use by xdp_adjust_head */ 42 #define VIRTIO_XDP_HEADROOM 256 43 44 /* Separating two types of XDP xmit */ 45 #define VIRTIO_XDP_TX BIT(0) 46 #define VIRTIO_XDP_REDIR BIT(1) 47 48 #define VIRTIO_XDP_FLAG BIT(0) 49 50 /* RX packet size EWMA. The average packet size is used to determine the packet 51 * buffer size when refilling RX rings. As the entire RX ring may be refilled 52 * at once, the weight is chosen so that the EWMA will be insensitive to short- 53 * term, transient changes in packet size. 54 */ 55 DECLARE_EWMA(pkt_len, 0, 64) 56 57 #define VIRTNET_DRIVER_VERSION "1.0.0" 58 59 static const unsigned long guest_offloads[] = { 60 VIRTIO_NET_F_GUEST_TSO4, 61 VIRTIO_NET_F_GUEST_TSO6, 62 VIRTIO_NET_F_GUEST_ECN, 63 VIRTIO_NET_F_GUEST_UFO, 64 VIRTIO_NET_F_GUEST_CSUM, 65 VIRTIO_NET_F_GUEST_USO4, 66 VIRTIO_NET_F_GUEST_USO6, 67 VIRTIO_NET_F_GUEST_HDRLEN 68 }; 69 70 #define GUEST_OFFLOAD_GRO_HW_MASK ((1ULL << VIRTIO_NET_F_GUEST_TSO4) | \ 71 (1ULL << VIRTIO_NET_F_GUEST_TSO6) | \ 72 (1ULL << VIRTIO_NET_F_GUEST_ECN) | \ 73 (1ULL << VIRTIO_NET_F_GUEST_UFO) | \ 74 (1ULL << VIRTIO_NET_F_GUEST_USO4) | \ 75 (1ULL << VIRTIO_NET_F_GUEST_USO6)) 76 77 struct virtnet_stat_desc { 78 char desc[ETH_GSTRING_LEN]; 79 size_t offset; 80 }; 81 82 struct virtnet_sq_stats { 83 struct u64_stats_sync syncp; 84 u64 packets; 85 u64 bytes; 86 u64 xdp_tx; 87 u64 xdp_tx_drops; 88 u64 kicks; 89 u64 tx_timeouts; 90 }; 91 92 struct virtnet_rq_stats { 93 struct u64_stats_sync syncp; 94 u64 packets; 95 u64 bytes; 96 u64 drops; 97 u64 xdp_packets; 98 u64 xdp_tx; 99 u64 xdp_redirects; 100 u64 xdp_drops; 101 u64 kicks; 102 }; 103 104 #define VIRTNET_SQ_STAT(m) offsetof(struct virtnet_sq_stats, m) 105 #define VIRTNET_RQ_STAT(m) offsetof(struct virtnet_rq_stats, m) 106 107 static const struct virtnet_stat_desc virtnet_sq_stats_desc[] = { 108 { "packets", VIRTNET_SQ_STAT(packets) }, 109 { "bytes", VIRTNET_SQ_STAT(bytes) }, 110 { "xdp_tx", VIRTNET_SQ_STAT(xdp_tx) }, 111 { "xdp_tx_drops", VIRTNET_SQ_STAT(xdp_tx_drops) }, 112 { "kicks", VIRTNET_SQ_STAT(kicks) }, 113 { "tx_timeouts", VIRTNET_SQ_STAT(tx_timeouts) }, 114 }; 115 116 static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = { 117 { "packets", VIRTNET_RQ_STAT(packets) }, 118 { "bytes", VIRTNET_RQ_STAT(bytes) }, 119 { "drops", VIRTNET_RQ_STAT(drops) }, 120 { "xdp_packets", VIRTNET_RQ_STAT(xdp_packets) }, 121 { "xdp_tx", VIRTNET_RQ_STAT(xdp_tx) }, 122 { "xdp_redirects", VIRTNET_RQ_STAT(xdp_redirects) }, 123 { "xdp_drops", VIRTNET_RQ_STAT(xdp_drops) }, 124 { "kicks", VIRTNET_RQ_STAT(kicks) }, 125 }; 126 127 #define VIRTNET_SQ_STATS_LEN ARRAY_SIZE(virtnet_sq_stats_desc) 128 #define VIRTNET_RQ_STATS_LEN ARRAY_SIZE(virtnet_rq_stats_desc) 129 130 /* Internal representation of a send virtqueue */ 131 struct send_queue { 132 /* Virtqueue associated with this send _queue */ 133 struct virtqueue *vq; 134 135 /* TX: fragments + linear part + virtio header */ 136 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 137 138 /* Name of the send queue: output.$index */ 139 char name[16]; 140 141 struct virtnet_sq_stats stats; 142 143 struct napi_struct napi; 144 145 /* Record whether sq is in reset state. */ 146 bool reset; 147 }; 148 149 /* Internal representation of a receive virtqueue */ 150 struct receive_queue { 151 /* Virtqueue associated with this receive_queue */ 152 struct virtqueue *vq; 153 154 struct napi_struct napi; 155 156 struct bpf_prog __rcu *xdp_prog; 157 158 struct virtnet_rq_stats stats; 159 160 /* Chain pages by the private ptr. */ 161 struct page *pages; 162 163 /* Average packet length for mergeable receive buffers. */ 164 struct ewma_pkt_len mrg_avg_pkt_len; 165 166 /* Page frag for packet buffer allocation. */ 167 struct page_frag alloc_frag; 168 169 /* RX: fragments + linear part + virtio header */ 170 struct scatterlist sg[MAX_SKB_FRAGS + 2]; 171 172 /* Min single buffer size for mergeable buffers case. */ 173 unsigned int min_buf_len; 174 175 /* Name of this receive queue: input.$index */ 176 char name[16]; 177 178 struct xdp_rxq_info xdp_rxq; 179 }; 180 181 /* This structure can contain rss message with maximum settings for indirection table and keysize 182 * Note, that default structure that describes RSS configuration virtio_net_rss_config 183 * contains same info but can't handle table values. 184 * In any case, structure would be passed to virtio hw through sg_buf split by parts 185 * because table sizes may be differ according to the device configuration. 186 */ 187 #define VIRTIO_NET_RSS_MAX_KEY_SIZE 40 188 #define VIRTIO_NET_RSS_MAX_TABLE_LEN 128 189 struct virtio_net_ctrl_rss { 190 u32 hash_types; 191 u16 indirection_table_mask; 192 u16 unclassified_queue; 193 u16 indirection_table[VIRTIO_NET_RSS_MAX_TABLE_LEN]; 194 u16 max_tx_vq; 195 u8 hash_key_length; 196 u8 key[VIRTIO_NET_RSS_MAX_KEY_SIZE]; 197 }; 198 199 /* Control VQ buffers: protected by the rtnl lock */ 200 struct control_buf { 201 struct virtio_net_ctrl_hdr hdr; 202 virtio_net_ctrl_ack status; 203 struct virtio_net_ctrl_mq mq; 204 u8 promisc; 205 u8 allmulti; 206 __virtio16 vid; 207 __virtio64 offloads; 208 struct virtio_net_ctrl_rss rss; 209 struct virtio_net_ctrl_coal_tx coal_tx; 210 struct virtio_net_ctrl_coal_rx coal_rx; 211 }; 212 213 struct virtnet_info { 214 struct virtio_device *vdev; 215 struct virtqueue *cvq; 216 struct net_device *dev; 217 struct send_queue *sq; 218 struct receive_queue *rq; 219 unsigned int status; 220 221 /* Max # of queue pairs supported by the device */ 222 u16 max_queue_pairs; 223 224 /* # of queue pairs currently used by the driver */ 225 u16 curr_queue_pairs; 226 227 /* # of XDP queue pairs currently used by the driver */ 228 u16 xdp_queue_pairs; 229 230 /* xdp_queue_pairs may be 0, when xdp is already loaded. So add this. */ 231 bool xdp_enabled; 232 233 /* I like... big packets and I cannot lie! */ 234 bool big_packets; 235 236 /* number of sg entries allocated for big packets */ 237 unsigned int big_packets_num_skbfrags; 238 239 /* Host will merge rx buffers for big packets (shake it! shake it!) */ 240 bool mergeable_rx_bufs; 241 242 /* Host supports rss and/or hash report */ 243 bool has_rss; 244 bool has_rss_hash_report; 245 u8 rss_key_size; 246 u16 rss_indir_table_size; 247 u32 rss_hash_types_supported; 248 u32 rss_hash_types_saved; 249 250 /* Has control virtqueue */ 251 bool has_cvq; 252 253 /* Host can handle any s/g split between our header and packet data */ 254 bool any_header_sg; 255 256 /* Packet virtio header size */ 257 u8 hdr_len; 258 259 /* Work struct for delayed refilling if we run low on memory. */ 260 struct delayed_work refill; 261 262 /* Is delayed refill enabled? */ 263 bool refill_enabled; 264 265 /* The lock to synchronize the access to refill_enabled */ 266 spinlock_t refill_lock; 267 268 /* Work struct for config space updates */ 269 struct work_struct config_work; 270 271 /* Does the affinity hint is set for virtqueues? */ 272 bool affinity_hint_set; 273 274 /* CPU hotplug instances for online & dead */ 275 struct hlist_node node; 276 struct hlist_node node_dead; 277 278 struct control_buf *ctrl; 279 280 /* Ethtool settings */ 281 u8 duplex; 282 u32 speed; 283 284 /* Interrupt coalescing settings */ 285 u32 tx_usecs; 286 u32 rx_usecs; 287 u32 tx_max_packets; 288 u32 rx_max_packets; 289 290 unsigned long guest_offloads; 291 unsigned long guest_offloads_capable; 292 293 /* failover when STANDBY feature enabled */ 294 struct failover *failover; 295 }; 296 297 struct padded_vnet_hdr { 298 struct virtio_net_hdr_v1_hash hdr; 299 /* 300 * hdr is in a separate sg buffer, and data sg buffer shares same page 301 * with this header sg. This padding makes next sg 16 byte aligned 302 * after the header. 303 */ 304 char padding[12]; 305 }; 306 307 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); 308 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf); 309 310 static bool is_xdp_frame(void *ptr) 311 { 312 return (unsigned long)ptr & VIRTIO_XDP_FLAG; 313 } 314 315 static void *xdp_to_ptr(struct xdp_frame *ptr) 316 { 317 return (void *)((unsigned long)ptr | VIRTIO_XDP_FLAG); 318 } 319 320 static struct xdp_frame *ptr_to_xdp(void *ptr) 321 { 322 return (struct xdp_frame *)((unsigned long)ptr & ~VIRTIO_XDP_FLAG); 323 } 324 325 /* Converting between virtqueue no. and kernel tx/rx queue no. 326 * 0:rx0 1:tx0 2:rx1 3:tx1 ... 2N:rxN 2N+1:txN 2N+2:cvq 327 */ 328 static int vq2txq(struct virtqueue *vq) 329 { 330 return (vq->index - 1) / 2; 331 } 332 333 static int txq2vq(int txq) 334 { 335 return txq * 2 + 1; 336 } 337 338 static int vq2rxq(struct virtqueue *vq) 339 { 340 return vq->index / 2; 341 } 342 343 static int rxq2vq(int rxq) 344 { 345 return rxq * 2; 346 } 347 348 static inline struct virtio_net_hdr_mrg_rxbuf *skb_vnet_hdr(struct sk_buff *skb) 349 { 350 return (struct virtio_net_hdr_mrg_rxbuf *)skb->cb; 351 } 352 353 /* 354 * private is used to chain pages for big packets, put the whole 355 * most recent used list in the beginning for reuse 356 */ 357 static void give_pages(struct receive_queue *rq, struct page *page) 358 { 359 struct page *end; 360 361 /* Find end of list, sew whole thing into vi->rq.pages. */ 362 for (end = page; end->private; end = (struct page *)end->private); 363 end->private = (unsigned long)rq->pages; 364 rq->pages = page; 365 } 366 367 static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) 368 { 369 struct page *p = rq->pages; 370 371 if (p) { 372 rq->pages = (struct page *)p->private; 373 /* clear private here, it is used to chain pages */ 374 p->private = 0; 375 } else 376 p = alloc_page(gfp_mask); 377 return p; 378 } 379 380 static void enable_delayed_refill(struct virtnet_info *vi) 381 { 382 spin_lock_bh(&vi->refill_lock); 383 vi->refill_enabled = true; 384 spin_unlock_bh(&vi->refill_lock); 385 } 386 387 static void disable_delayed_refill(struct virtnet_info *vi) 388 { 389 spin_lock_bh(&vi->refill_lock); 390 vi->refill_enabled = false; 391 spin_unlock_bh(&vi->refill_lock); 392 } 393 394 static void virtqueue_napi_schedule(struct napi_struct *napi, 395 struct virtqueue *vq) 396 { 397 if (napi_schedule_prep(napi)) { 398 virtqueue_disable_cb(vq); 399 __napi_schedule(napi); 400 } 401 } 402 403 static void virtqueue_napi_complete(struct napi_struct *napi, 404 struct virtqueue *vq, int processed) 405 { 406 int opaque; 407 408 opaque = virtqueue_enable_cb_prepare(vq); 409 if (napi_complete_done(napi, processed)) { 410 if (unlikely(virtqueue_poll(vq, opaque))) 411 virtqueue_napi_schedule(napi, vq); 412 } else { 413 virtqueue_disable_cb(vq); 414 } 415 } 416 417 static void skb_xmit_done(struct virtqueue *vq) 418 { 419 struct virtnet_info *vi = vq->vdev->priv; 420 struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi; 421 422 /* Suppress further interrupts. */ 423 virtqueue_disable_cb(vq); 424 425 if (napi->weight) 426 virtqueue_napi_schedule(napi, vq); 427 else 428 /* We were probably waiting for more output buffers. */ 429 netif_wake_subqueue(vi->dev, vq2txq(vq)); 430 } 431 432 #define MRG_CTX_HEADER_SHIFT 22 433 static void *mergeable_len_to_ctx(unsigned int truesize, 434 unsigned int headroom) 435 { 436 return (void *)(unsigned long)((headroom << MRG_CTX_HEADER_SHIFT) | truesize); 437 } 438 439 static unsigned int mergeable_ctx_to_headroom(void *mrg_ctx) 440 { 441 return (unsigned long)mrg_ctx >> MRG_CTX_HEADER_SHIFT; 442 } 443 444 static unsigned int mergeable_ctx_to_truesize(void *mrg_ctx) 445 { 446 return (unsigned long)mrg_ctx & ((1 << MRG_CTX_HEADER_SHIFT) - 1); 447 } 448 449 static struct sk_buff *virtnet_build_skb(void *buf, unsigned int buflen, 450 unsigned int headroom, 451 unsigned int len) 452 { 453 struct sk_buff *skb; 454 455 skb = build_skb(buf, buflen); 456 if (unlikely(!skb)) 457 return NULL; 458 459 skb_reserve(skb, headroom); 460 skb_put(skb, len); 461 462 return skb; 463 } 464 465 /* Called from bottom half context */ 466 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 467 struct receive_queue *rq, 468 struct page *page, unsigned int offset, 469 unsigned int len, unsigned int truesize, 470 unsigned int headroom) 471 { 472 struct sk_buff *skb; 473 struct virtio_net_hdr_mrg_rxbuf *hdr; 474 unsigned int copy, hdr_len, hdr_padded_len; 475 struct page *page_to_free = NULL; 476 int tailroom, shinfo_size; 477 char *p, *hdr_p, *buf; 478 479 p = page_address(page) + offset; 480 hdr_p = p; 481 482 hdr_len = vi->hdr_len; 483 if (vi->mergeable_rx_bufs) 484 hdr_padded_len = hdr_len; 485 else 486 hdr_padded_len = sizeof(struct padded_vnet_hdr); 487 488 buf = p - headroom; 489 len -= hdr_len; 490 offset += hdr_padded_len; 491 p += hdr_padded_len; 492 tailroom = truesize - headroom - hdr_padded_len - len; 493 494 shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 495 496 /* copy small packet so we can reuse these pages */ 497 if (!NET_IP_ALIGN && len > GOOD_COPY_LEN && tailroom >= shinfo_size) { 498 skb = virtnet_build_skb(buf, truesize, p - buf, len); 499 if (unlikely(!skb)) 500 return NULL; 501 502 page = (struct page *)page->private; 503 if (page) 504 give_pages(rq, page); 505 goto ok; 506 } 507 508 /* copy small packet so we can reuse these pages for small data */ 509 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 510 if (unlikely(!skb)) 511 return NULL; 512 513 /* Copy all frame if it fits skb->head, otherwise 514 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed. 515 */ 516 if (len <= skb_tailroom(skb)) 517 copy = len; 518 else 519 copy = ETH_HLEN; 520 skb_put_data(skb, p, copy); 521 522 len -= copy; 523 offset += copy; 524 525 if (vi->mergeable_rx_bufs) { 526 if (len) 527 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 528 else 529 page_to_free = page; 530 goto ok; 531 } 532 533 /* 534 * Verify that we can indeed put this data into a skb. 535 * This is here to handle cases when the device erroneously 536 * tries to receive more than is possible. This is usually 537 * the case of a broken device. 538 */ 539 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 540 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 541 dev_kfree_skb(skb); 542 return NULL; 543 } 544 BUG_ON(offset >= PAGE_SIZE); 545 while (len) { 546 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 547 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 548 frag_size, truesize); 549 len -= frag_size; 550 page = (struct page *)page->private; 551 offset = 0; 552 } 553 554 if (page) 555 give_pages(rq, page); 556 557 ok: 558 hdr = skb_vnet_hdr(skb); 559 memcpy(hdr, hdr_p, hdr_len); 560 if (page_to_free) 561 put_page(page_to_free); 562 563 return skb; 564 } 565 566 static void free_old_xmit_skbs(struct send_queue *sq, bool in_napi) 567 { 568 unsigned int len; 569 unsigned int packets = 0; 570 unsigned int bytes = 0; 571 void *ptr; 572 573 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 574 if (likely(!is_xdp_frame(ptr))) { 575 struct sk_buff *skb = ptr; 576 577 pr_debug("Sent skb %p\n", skb); 578 579 bytes += skb->len; 580 napi_consume_skb(skb, in_napi); 581 } else { 582 struct xdp_frame *frame = ptr_to_xdp(ptr); 583 584 bytes += xdp_get_frame_len(frame); 585 xdp_return_frame(frame); 586 } 587 packets++; 588 } 589 590 /* Avoid overhead when no packets have been processed 591 * happens when called speculatively from start_xmit. 592 */ 593 if (!packets) 594 return; 595 596 u64_stats_update_begin(&sq->stats.syncp); 597 sq->stats.bytes += bytes; 598 sq->stats.packets += packets; 599 u64_stats_update_end(&sq->stats.syncp); 600 } 601 602 static bool is_xdp_raw_buffer_queue(struct virtnet_info *vi, int q) 603 { 604 if (q < (vi->curr_queue_pairs - vi->xdp_queue_pairs)) 605 return false; 606 else if (q < vi->curr_queue_pairs) 607 return true; 608 else 609 return false; 610 } 611 612 static void check_sq_full_and_disable(struct virtnet_info *vi, 613 struct net_device *dev, 614 struct send_queue *sq) 615 { 616 bool use_napi = sq->napi.weight; 617 int qnum; 618 619 qnum = sq - vi->sq; 620 621 /* If running out of space, stop queue to avoid getting packets that we 622 * are then unable to transmit. 623 * An alternative would be to force queuing layer to requeue the skb by 624 * returning NETDEV_TX_BUSY. However, NETDEV_TX_BUSY should not be 625 * returned in a normal path of operation: it means that driver is not 626 * maintaining the TX queue stop/start state properly, and causes 627 * the stack to do a non-trivial amount of useless work. 628 * Since most packets only take 1 or 2 ring slots, stopping the queue 629 * early means 16 slots are typically wasted. 630 */ 631 if (sq->vq->num_free < 2+MAX_SKB_FRAGS) { 632 netif_stop_subqueue(dev, qnum); 633 if (use_napi) { 634 if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) 635 virtqueue_napi_schedule(&sq->napi, sq->vq); 636 } else if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) { 637 /* More just got used, free them then recheck. */ 638 free_old_xmit_skbs(sq, false); 639 if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) { 640 netif_start_subqueue(dev, qnum); 641 virtqueue_disable_cb(sq->vq); 642 } 643 } 644 } 645 } 646 647 static int __virtnet_xdp_xmit_one(struct virtnet_info *vi, 648 struct send_queue *sq, 649 struct xdp_frame *xdpf) 650 { 651 struct virtio_net_hdr_mrg_rxbuf *hdr; 652 struct skb_shared_info *shinfo; 653 u8 nr_frags = 0; 654 int err, i; 655 656 if (unlikely(xdpf->headroom < vi->hdr_len)) 657 return -EOVERFLOW; 658 659 if (unlikely(xdp_frame_has_frags(xdpf))) { 660 shinfo = xdp_get_shared_info_from_frame(xdpf); 661 nr_frags = shinfo->nr_frags; 662 } 663 664 /* In wrapping function virtnet_xdp_xmit(), we need to free 665 * up the pending old buffers, where we need to calculate the 666 * position of skb_shared_info in xdp_get_frame_len() and 667 * xdp_return_frame(), which will involve to xdpf->data and 668 * xdpf->headroom. Therefore, we need to update the value of 669 * headroom synchronously here. 670 */ 671 xdpf->headroom -= vi->hdr_len; 672 xdpf->data -= vi->hdr_len; 673 /* Zero header and leave csum up to XDP layers */ 674 hdr = xdpf->data; 675 memset(hdr, 0, vi->hdr_len); 676 xdpf->len += vi->hdr_len; 677 678 sg_init_table(sq->sg, nr_frags + 1); 679 sg_set_buf(sq->sg, xdpf->data, xdpf->len); 680 for (i = 0; i < nr_frags; i++) { 681 skb_frag_t *frag = &shinfo->frags[i]; 682 683 sg_set_page(&sq->sg[i + 1], skb_frag_page(frag), 684 skb_frag_size(frag), skb_frag_off(frag)); 685 } 686 687 err = virtqueue_add_outbuf(sq->vq, sq->sg, nr_frags + 1, 688 xdp_to_ptr(xdpf), GFP_ATOMIC); 689 if (unlikely(err)) 690 return -ENOSPC; /* Caller handle free/refcnt */ 691 692 return 0; 693 } 694 695 /* when vi->curr_queue_pairs > nr_cpu_ids, the txq/sq is only used for xdp tx on 696 * the current cpu, so it does not need to be locked. 697 * 698 * Here we use marco instead of inline functions because we have to deal with 699 * three issues at the same time: 1. the choice of sq. 2. judge and execute the 700 * lock/unlock of txq 3. make sparse happy. It is difficult for two inline 701 * functions to perfectly solve these three problems at the same time. 702 */ 703 #define virtnet_xdp_get_sq(vi) ({ \ 704 int cpu = smp_processor_id(); \ 705 struct netdev_queue *txq; \ 706 typeof(vi) v = (vi); \ 707 unsigned int qp; \ 708 \ 709 if (v->curr_queue_pairs > nr_cpu_ids) { \ 710 qp = v->curr_queue_pairs - v->xdp_queue_pairs; \ 711 qp += cpu; \ 712 txq = netdev_get_tx_queue(v->dev, qp); \ 713 __netif_tx_acquire(txq); \ 714 } else { \ 715 qp = cpu % v->curr_queue_pairs; \ 716 txq = netdev_get_tx_queue(v->dev, qp); \ 717 __netif_tx_lock(txq, cpu); \ 718 } \ 719 v->sq + qp; \ 720 }) 721 722 #define virtnet_xdp_put_sq(vi, q) { \ 723 struct netdev_queue *txq; \ 724 typeof(vi) v = (vi); \ 725 \ 726 txq = netdev_get_tx_queue(v->dev, (q) - v->sq); \ 727 if (v->curr_queue_pairs > nr_cpu_ids) \ 728 __netif_tx_release(txq); \ 729 else \ 730 __netif_tx_unlock(txq); \ 731 } 732 733 static int virtnet_xdp_xmit(struct net_device *dev, 734 int n, struct xdp_frame **frames, u32 flags) 735 { 736 struct virtnet_info *vi = netdev_priv(dev); 737 struct receive_queue *rq = vi->rq; 738 struct bpf_prog *xdp_prog; 739 struct send_queue *sq; 740 unsigned int len; 741 int packets = 0; 742 int bytes = 0; 743 int nxmit = 0; 744 int kicks = 0; 745 void *ptr; 746 int ret; 747 int i; 748 749 /* Only allow ndo_xdp_xmit if XDP is loaded on dev, as this 750 * indicate XDP resources have been successfully allocated. 751 */ 752 xdp_prog = rcu_access_pointer(rq->xdp_prog); 753 if (!xdp_prog) 754 return -ENXIO; 755 756 sq = virtnet_xdp_get_sq(vi); 757 758 if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) { 759 ret = -EINVAL; 760 goto out; 761 } 762 763 /* Free up any pending old buffers before queueing new ones. */ 764 while ((ptr = virtqueue_get_buf(sq->vq, &len)) != NULL) { 765 if (likely(is_xdp_frame(ptr))) { 766 struct xdp_frame *frame = ptr_to_xdp(ptr); 767 768 bytes += xdp_get_frame_len(frame); 769 xdp_return_frame(frame); 770 } else { 771 struct sk_buff *skb = ptr; 772 773 bytes += skb->len; 774 napi_consume_skb(skb, false); 775 } 776 packets++; 777 } 778 779 for (i = 0; i < n; i++) { 780 struct xdp_frame *xdpf = frames[i]; 781 782 if (__virtnet_xdp_xmit_one(vi, sq, xdpf)) 783 break; 784 nxmit++; 785 } 786 ret = nxmit; 787 788 if (!is_xdp_raw_buffer_queue(vi, sq - vi->sq)) 789 check_sq_full_and_disable(vi, dev, sq); 790 791 if (flags & XDP_XMIT_FLUSH) { 792 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) 793 kicks = 1; 794 } 795 out: 796 u64_stats_update_begin(&sq->stats.syncp); 797 sq->stats.bytes += bytes; 798 sq->stats.packets += packets; 799 sq->stats.xdp_tx += n; 800 sq->stats.xdp_tx_drops += n - nxmit; 801 sq->stats.kicks += kicks; 802 u64_stats_update_end(&sq->stats.syncp); 803 804 virtnet_xdp_put_sq(vi, sq); 805 return ret; 806 } 807 808 static void put_xdp_frags(struct xdp_buff *xdp) 809 { 810 struct skb_shared_info *shinfo; 811 struct page *xdp_page; 812 int i; 813 814 if (xdp_buff_has_frags(xdp)) { 815 shinfo = xdp_get_shared_info_from_buff(xdp); 816 for (i = 0; i < shinfo->nr_frags; i++) { 817 xdp_page = skb_frag_page(&shinfo->frags[i]); 818 put_page(xdp_page); 819 } 820 } 821 } 822 823 static int virtnet_xdp_handler(struct bpf_prog *xdp_prog, struct xdp_buff *xdp, 824 struct net_device *dev, 825 unsigned int *xdp_xmit, 826 struct virtnet_rq_stats *stats) 827 { 828 struct xdp_frame *xdpf; 829 int err; 830 u32 act; 831 832 act = bpf_prog_run_xdp(xdp_prog, xdp); 833 stats->xdp_packets++; 834 835 switch (act) { 836 case XDP_PASS: 837 return act; 838 839 case XDP_TX: 840 stats->xdp_tx++; 841 xdpf = xdp_convert_buff_to_frame(xdp); 842 if (unlikely(!xdpf)) { 843 netdev_dbg(dev, "convert buff to frame failed for xdp\n"); 844 return XDP_DROP; 845 } 846 847 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 848 if (unlikely(!err)) { 849 xdp_return_frame_rx_napi(xdpf); 850 } else if (unlikely(err < 0)) { 851 trace_xdp_exception(dev, xdp_prog, act); 852 return XDP_DROP; 853 } 854 *xdp_xmit |= VIRTIO_XDP_TX; 855 return act; 856 857 case XDP_REDIRECT: 858 stats->xdp_redirects++; 859 err = xdp_do_redirect(dev, xdp, xdp_prog); 860 if (err) 861 return XDP_DROP; 862 863 *xdp_xmit |= VIRTIO_XDP_REDIR; 864 return act; 865 866 default: 867 bpf_warn_invalid_xdp_action(dev, xdp_prog, act); 868 fallthrough; 869 case XDP_ABORTED: 870 trace_xdp_exception(dev, xdp_prog, act); 871 fallthrough; 872 case XDP_DROP: 873 return XDP_DROP; 874 } 875 } 876 877 static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 878 { 879 return vi->xdp_enabled ? VIRTIO_XDP_HEADROOM : 0; 880 } 881 882 /* We copy the packet for XDP in the following cases: 883 * 884 * 1) Packet is scattered across multiple rx buffers. 885 * 2) Headroom space is insufficient. 886 * 887 * This is inefficient but it's a temporary condition that 888 * we hit right after XDP is enabled and until queue is refilled 889 * with large buffers with sufficient headroom - so it should affect 890 * at most queue size packets. 891 * Afterwards, the conditions to enable 892 * XDP should preclude the underlying device from sending packets 893 * across multiple buffers (num_buf > 1), and we make sure buffers 894 * have enough headroom. 895 */ 896 static struct page *xdp_linearize_page(struct receive_queue *rq, 897 int *num_buf, 898 struct page *p, 899 int offset, 900 int page_off, 901 unsigned int *len) 902 { 903 int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 904 struct page *page; 905 906 if (page_off + *len + tailroom > PAGE_SIZE) 907 return NULL; 908 909 page = alloc_page(GFP_ATOMIC); 910 if (!page) 911 return NULL; 912 913 memcpy(page_address(page) + page_off, page_address(p) + offset, *len); 914 page_off += *len; 915 916 while (--*num_buf) { 917 unsigned int buflen; 918 void *buf; 919 int off; 920 921 buf = virtqueue_get_buf(rq->vq, &buflen); 922 if (unlikely(!buf)) 923 goto err_buf; 924 925 p = virt_to_head_page(buf); 926 off = buf - page_address(p); 927 928 /* guard against a misconfigured or uncooperative backend that 929 * is sending packet larger than the MTU. 930 */ 931 if ((page_off + buflen + tailroom) > PAGE_SIZE) { 932 put_page(p); 933 goto err_buf; 934 } 935 936 memcpy(page_address(page) + page_off, 937 page_address(p) + off, buflen); 938 page_off += buflen; 939 put_page(p); 940 } 941 942 /* Headroom does not contribute to packet length */ 943 *len = page_off - VIRTIO_XDP_HEADROOM; 944 return page; 945 err_buf: 946 __free_pages(page, 0); 947 return NULL; 948 } 949 950 static struct sk_buff *receive_small_build_skb(struct virtnet_info *vi, 951 unsigned int xdp_headroom, 952 void *buf, 953 unsigned int len) 954 { 955 unsigned int header_offset; 956 unsigned int headroom; 957 unsigned int buflen; 958 struct sk_buff *skb; 959 960 header_offset = VIRTNET_RX_PAD + xdp_headroom; 961 headroom = vi->hdr_len + header_offset; 962 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 963 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 964 965 skb = virtnet_build_skb(buf, buflen, headroom, len); 966 if (unlikely(!skb)) 967 return NULL; 968 969 buf += header_offset; 970 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 971 972 return skb; 973 } 974 975 static struct sk_buff *receive_small_xdp(struct net_device *dev, 976 struct virtnet_info *vi, 977 struct receive_queue *rq, 978 struct bpf_prog *xdp_prog, 979 void *buf, 980 unsigned int xdp_headroom, 981 unsigned int len, 982 unsigned int *xdp_xmit, 983 struct virtnet_rq_stats *stats) 984 { 985 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 986 unsigned int headroom = vi->hdr_len + header_offset; 987 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 988 struct page *page = virt_to_head_page(buf); 989 struct page *xdp_page; 990 unsigned int buflen; 991 struct xdp_buff xdp; 992 struct sk_buff *skb; 993 unsigned int metasize = 0; 994 u32 act; 995 996 if (unlikely(hdr->hdr.gso_type)) 997 goto err_xdp; 998 999 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 1000 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1001 1002 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 1003 int offset = buf - page_address(page) + header_offset; 1004 unsigned int tlen = len + vi->hdr_len; 1005 int num_buf = 1; 1006 1007 xdp_headroom = virtnet_get_headroom(vi); 1008 header_offset = VIRTNET_RX_PAD + xdp_headroom; 1009 headroom = vi->hdr_len + header_offset; 1010 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 1011 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1012 xdp_page = xdp_linearize_page(rq, &num_buf, page, 1013 offset, header_offset, 1014 &tlen); 1015 if (!xdp_page) 1016 goto err_xdp; 1017 1018 buf = page_address(xdp_page); 1019 put_page(page); 1020 page = xdp_page; 1021 } 1022 1023 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); 1024 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, 1025 xdp_headroom, len, true); 1026 1027 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); 1028 1029 switch (act) { 1030 case XDP_PASS: 1031 /* Recalculate length in case bpf program changed it */ 1032 len = xdp.data_end - xdp.data; 1033 metasize = xdp.data - xdp.data_meta; 1034 break; 1035 1036 case XDP_TX: 1037 case XDP_REDIRECT: 1038 goto xdp_xmit; 1039 1040 default: 1041 goto err_xdp; 1042 } 1043 1044 skb = virtnet_build_skb(buf, buflen, xdp.data - buf, len); 1045 if (unlikely(!skb)) 1046 goto err; 1047 1048 if (metasize) 1049 skb_metadata_set(skb, metasize); 1050 1051 return skb; 1052 1053 err_xdp: 1054 stats->xdp_drops++; 1055 err: 1056 stats->drops++; 1057 put_page(page); 1058 xdp_xmit: 1059 return NULL; 1060 } 1061 1062 static struct sk_buff *receive_small(struct net_device *dev, 1063 struct virtnet_info *vi, 1064 struct receive_queue *rq, 1065 void *buf, void *ctx, 1066 unsigned int len, 1067 unsigned int *xdp_xmit, 1068 struct virtnet_rq_stats *stats) 1069 { 1070 unsigned int xdp_headroom = (unsigned long)ctx; 1071 struct page *page = virt_to_head_page(buf); 1072 struct sk_buff *skb; 1073 1074 len -= vi->hdr_len; 1075 stats->bytes += len; 1076 1077 if (unlikely(len > GOOD_PACKET_LEN)) { 1078 pr_debug("%s: rx error: len %u exceeds max size %d\n", 1079 dev->name, len, GOOD_PACKET_LEN); 1080 dev->stats.rx_length_errors++; 1081 goto err; 1082 } 1083 1084 if (unlikely(vi->xdp_enabled)) { 1085 struct bpf_prog *xdp_prog; 1086 1087 rcu_read_lock(); 1088 xdp_prog = rcu_dereference(rq->xdp_prog); 1089 if (xdp_prog) { 1090 skb = receive_small_xdp(dev, vi, rq, xdp_prog, buf, 1091 xdp_headroom, len, xdp_xmit, 1092 stats); 1093 rcu_read_unlock(); 1094 return skb; 1095 } 1096 rcu_read_unlock(); 1097 } 1098 1099 skb = receive_small_build_skb(vi, xdp_headroom, buf, len); 1100 if (likely(skb)) 1101 return skb; 1102 1103 err: 1104 stats->drops++; 1105 put_page(page); 1106 return NULL; 1107 } 1108 1109 static struct sk_buff *receive_big(struct net_device *dev, 1110 struct virtnet_info *vi, 1111 struct receive_queue *rq, 1112 void *buf, 1113 unsigned int len, 1114 struct virtnet_rq_stats *stats) 1115 { 1116 struct page *page = buf; 1117 struct sk_buff *skb = 1118 page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, 0); 1119 1120 stats->bytes += len - vi->hdr_len; 1121 if (unlikely(!skb)) 1122 goto err; 1123 1124 return skb; 1125 1126 err: 1127 stats->drops++; 1128 give_pages(rq, page); 1129 return NULL; 1130 } 1131 1132 static void mergeable_buf_free(struct receive_queue *rq, int num_buf, 1133 struct net_device *dev, 1134 struct virtnet_rq_stats *stats) 1135 { 1136 struct page *page; 1137 void *buf; 1138 int len; 1139 1140 while (num_buf-- > 1) { 1141 buf = virtqueue_get_buf(rq->vq, &len); 1142 if (unlikely(!buf)) { 1143 pr_debug("%s: rx error: %d buffers missing\n", 1144 dev->name, num_buf); 1145 dev->stats.rx_length_errors++; 1146 break; 1147 } 1148 stats->bytes += len; 1149 page = virt_to_head_page(buf); 1150 put_page(page); 1151 } 1152 } 1153 1154 /* Why not use xdp_build_skb_from_frame() ? 1155 * XDP core assumes that xdp frags are PAGE_SIZE in length, while in 1156 * virtio-net there are 2 points that do not match its requirements: 1157 * 1. The size of the prefilled buffer is not fixed before xdp is set. 1158 * 2. xdp_build_skb_from_frame() does more checks that we don't need, 1159 * like eth_type_trans() (which virtio-net does in receive_buf()). 1160 */ 1161 static struct sk_buff *build_skb_from_xdp_buff(struct net_device *dev, 1162 struct virtnet_info *vi, 1163 struct xdp_buff *xdp, 1164 unsigned int xdp_frags_truesz) 1165 { 1166 struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); 1167 unsigned int headroom, data_len; 1168 struct sk_buff *skb; 1169 int metasize; 1170 u8 nr_frags; 1171 1172 if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 1173 pr_debug("Error building skb as missing reserved tailroom for xdp"); 1174 return NULL; 1175 } 1176 1177 if (unlikely(xdp_buff_has_frags(xdp))) 1178 nr_frags = sinfo->nr_frags; 1179 1180 skb = build_skb(xdp->data_hard_start, xdp->frame_sz); 1181 if (unlikely(!skb)) 1182 return NULL; 1183 1184 headroom = xdp->data - xdp->data_hard_start; 1185 data_len = xdp->data_end - xdp->data; 1186 skb_reserve(skb, headroom); 1187 __skb_put(skb, data_len); 1188 1189 metasize = xdp->data - xdp->data_meta; 1190 metasize = metasize > 0 ? metasize : 0; 1191 if (metasize) 1192 skb_metadata_set(skb, metasize); 1193 1194 if (unlikely(xdp_buff_has_frags(xdp))) 1195 xdp_update_skb_shared_info(skb, nr_frags, 1196 sinfo->xdp_frags_size, 1197 xdp_frags_truesz, 1198 xdp_buff_is_frag_pfmemalloc(xdp)); 1199 1200 return skb; 1201 } 1202 1203 /* TODO: build xdp in big mode */ 1204 static int virtnet_build_xdp_buff_mrg(struct net_device *dev, 1205 struct virtnet_info *vi, 1206 struct receive_queue *rq, 1207 struct xdp_buff *xdp, 1208 void *buf, 1209 unsigned int len, 1210 unsigned int frame_sz, 1211 int *num_buf, 1212 unsigned int *xdp_frags_truesize, 1213 struct virtnet_rq_stats *stats) 1214 { 1215 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1216 unsigned int headroom, tailroom, room; 1217 unsigned int truesize, cur_frag_size; 1218 struct skb_shared_info *shinfo; 1219 unsigned int xdp_frags_truesz = 0; 1220 struct page *page; 1221 skb_frag_t *frag; 1222 int offset; 1223 void *ctx; 1224 1225 xdp_init_buff(xdp, frame_sz, &rq->xdp_rxq); 1226 xdp_prepare_buff(xdp, buf - VIRTIO_XDP_HEADROOM, 1227 VIRTIO_XDP_HEADROOM + vi->hdr_len, len - vi->hdr_len, true); 1228 1229 if (!*num_buf) 1230 return 0; 1231 1232 if (*num_buf > 1) { 1233 /* If we want to build multi-buffer xdp, we need 1234 * to specify that the flags of xdp_buff have the 1235 * XDP_FLAGS_HAS_FRAG bit. 1236 */ 1237 if (!xdp_buff_has_frags(xdp)) 1238 xdp_buff_set_frags_flag(xdp); 1239 1240 shinfo = xdp_get_shared_info_from_buff(xdp); 1241 shinfo->nr_frags = 0; 1242 shinfo->xdp_frags_size = 0; 1243 } 1244 1245 if (*num_buf > MAX_SKB_FRAGS + 1) 1246 return -EINVAL; 1247 1248 while (--*num_buf > 0) { 1249 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1250 if (unlikely(!buf)) { 1251 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1252 dev->name, *num_buf, 1253 virtio16_to_cpu(vi->vdev, hdr->num_buffers)); 1254 dev->stats.rx_length_errors++; 1255 goto err; 1256 } 1257 1258 stats->bytes += len; 1259 page = virt_to_head_page(buf); 1260 offset = buf - page_address(page); 1261 1262 truesize = mergeable_ctx_to_truesize(ctx); 1263 headroom = mergeable_ctx_to_headroom(ctx); 1264 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1265 room = SKB_DATA_ALIGN(headroom + tailroom); 1266 1267 cur_frag_size = truesize; 1268 xdp_frags_truesz += cur_frag_size; 1269 if (unlikely(len > truesize - room || cur_frag_size > PAGE_SIZE)) { 1270 put_page(page); 1271 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1272 dev->name, len, (unsigned long)(truesize - room)); 1273 dev->stats.rx_length_errors++; 1274 goto err; 1275 } 1276 1277 frag = &shinfo->frags[shinfo->nr_frags++]; 1278 skb_frag_fill_page_desc(frag, page, offset, len); 1279 if (page_is_pfmemalloc(page)) 1280 xdp_buff_set_frag_pfmemalloc(xdp); 1281 1282 shinfo->xdp_frags_size += len; 1283 } 1284 1285 *xdp_frags_truesize = xdp_frags_truesz; 1286 return 0; 1287 1288 err: 1289 put_xdp_frags(xdp); 1290 return -EINVAL; 1291 } 1292 1293 static void *mergeable_xdp_get_buf(struct virtnet_info *vi, 1294 struct receive_queue *rq, 1295 struct bpf_prog *xdp_prog, 1296 void *ctx, 1297 unsigned int *frame_sz, 1298 int *num_buf, 1299 struct page **page, 1300 int offset, 1301 unsigned int *len, 1302 struct virtio_net_hdr_mrg_rxbuf *hdr) 1303 { 1304 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1305 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1306 struct page *xdp_page; 1307 unsigned int xdp_room; 1308 1309 /* Transient failure which in theory could occur if 1310 * in-flight packets from before XDP was enabled reach 1311 * the receive path after XDP is loaded. 1312 */ 1313 if (unlikely(hdr->hdr.gso_type)) 1314 return NULL; 1315 1316 /* Now XDP core assumes frag size is PAGE_SIZE, but buffers 1317 * with headroom may add hole in truesize, which 1318 * make their length exceed PAGE_SIZE. So we disabled the 1319 * hole mechanism for xdp. See add_recvbuf_mergeable(). 1320 */ 1321 *frame_sz = truesize; 1322 1323 if (likely(headroom >= virtnet_get_headroom(vi) && 1324 (*num_buf == 1 || xdp_prog->aux->xdp_has_frags))) { 1325 return page_address(*page) + offset; 1326 } 1327 1328 /* This happens when headroom is not enough because 1329 * of the buffer was prefilled before XDP is set. 1330 * This should only happen for the first several packets. 1331 * In fact, vq reset can be used here to help us clean up 1332 * the prefilled buffers, but many existing devices do not 1333 * support it, and we don't want to bother users who are 1334 * using xdp normally. 1335 */ 1336 if (!xdp_prog->aux->xdp_has_frags) { 1337 /* linearize data for XDP */ 1338 xdp_page = xdp_linearize_page(rq, num_buf, 1339 *page, offset, 1340 VIRTIO_XDP_HEADROOM, 1341 len); 1342 if (!xdp_page) 1343 return NULL; 1344 } else { 1345 xdp_room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 1346 sizeof(struct skb_shared_info)); 1347 if (*len + xdp_room > PAGE_SIZE) 1348 return NULL; 1349 1350 xdp_page = alloc_page(GFP_ATOMIC); 1351 if (!xdp_page) 1352 return NULL; 1353 1354 memcpy(page_address(xdp_page) + VIRTIO_XDP_HEADROOM, 1355 page_address(*page) + offset, *len); 1356 } 1357 1358 *frame_sz = PAGE_SIZE; 1359 1360 put_page(*page); 1361 1362 *page = xdp_page; 1363 1364 return page_address(*page) + VIRTIO_XDP_HEADROOM; 1365 } 1366 1367 static struct sk_buff *receive_mergeable_xdp(struct net_device *dev, 1368 struct virtnet_info *vi, 1369 struct receive_queue *rq, 1370 struct bpf_prog *xdp_prog, 1371 void *buf, 1372 void *ctx, 1373 unsigned int len, 1374 unsigned int *xdp_xmit, 1375 struct virtnet_rq_stats *stats) 1376 { 1377 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1378 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 1379 struct page *page = virt_to_head_page(buf); 1380 int offset = buf - page_address(page); 1381 unsigned int xdp_frags_truesz = 0; 1382 struct sk_buff *head_skb; 1383 unsigned int frame_sz; 1384 struct xdp_buff xdp; 1385 void *data; 1386 u32 act; 1387 int err; 1388 1389 data = mergeable_xdp_get_buf(vi, rq, xdp_prog, ctx, &frame_sz, &num_buf, &page, 1390 offset, &len, hdr); 1391 if (unlikely(!data)) 1392 goto err_xdp; 1393 1394 err = virtnet_build_xdp_buff_mrg(dev, vi, rq, &xdp, data, len, frame_sz, 1395 &num_buf, &xdp_frags_truesz, stats); 1396 if (unlikely(err)) 1397 goto err_xdp; 1398 1399 act = virtnet_xdp_handler(xdp_prog, &xdp, dev, xdp_xmit, stats); 1400 1401 switch (act) { 1402 case XDP_PASS: 1403 head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); 1404 if (unlikely(!head_skb)) 1405 break; 1406 return head_skb; 1407 1408 case XDP_TX: 1409 case XDP_REDIRECT: 1410 return NULL; 1411 1412 default: 1413 break; 1414 } 1415 1416 put_xdp_frags(&xdp); 1417 1418 err_xdp: 1419 put_page(page); 1420 mergeable_buf_free(rq, num_buf, dev, stats); 1421 1422 stats->xdp_drops++; 1423 stats->drops++; 1424 return NULL; 1425 } 1426 1427 static struct sk_buff *receive_mergeable(struct net_device *dev, 1428 struct virtnet_info *vi, 1429 struct receive_queue *rq, 1430 void *buf, 1431 void *ctx, 1432 unsigned int len, 1433 unsigned int *xdp_xmit, 1434 struct virtnet_rq_stats *stats) 1435 { 1436 struct virtio_net_hdr_mrg_rxbuf *hdr = buf; 1437 int num_buf = virtio16_to_cpu(vi->vdev, hdr->num_buffers); 1438 struct page *page = virt_to_head_page(buf); 1439 int offset = buf - page_address(page); 1440 struct sk_buff *head_skb, *curr_skb; 1441 unsigned int truesize = mergeable_ctx_to_truesize(ctx); 1442 unsigned int headroom = mergeable_ctx_to_headroom(ctx); 1443 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1444 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1445 1446 head_skb = NULL; 1447 stats->bytes += len - vi->hdr_len; 1448 1449 if (unlikely(len > truesize - room)) { 1450 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1451 dev->name, len, (unsigned long)(truesize - room)); 1452 dev->stats.rx_length_errors++; 1453 goto err_skb; 1454 } 1455 1456 if (unlikely(vi->xdp_enabled)) { 1457 struct bpf_prog *xdp_prog; 1458 1459 rcu_read_lock(); 1460 xdp_prog = rcu_dereference(rq->xdp_prog); 1461 if (xdp_prog) { 1462 head_skb = receive_mergeable_xdp(dev, vi, rq, xdp_prog, buf, ctx, 1463 len, xdp_xmit, stats); 1464 rcu_read_unlock(); 1465 return head_skb; 1466 } 1467 rcu_read_unlock(); 1468 } 1469 1470 head_skb = page_to_skb(vi, rq, page, offset, len, truesize, headroom); 1471 curr_skb = head_skb; 1472 1473 if (unlikely(!curr_skb)) 1474 goto err_skb; 1475 while (--num_buf) { 1476 int num_skb_frags; 1477 1478 buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx); 1479 if (unlikely(!buf)) { 1480 pr_debug("%s: rx error: %d buffers out of %d missing\n", 1481 dev->name, num_buf, 1482 virtio16_to_cpu(vi->vdev, 1483 hdr->num_buffers)); 1484 dev->stats.rx_length_errors++; 1485 goto err_buf; 1486 } 1487 1488 stats->bytes += len; 1489 page = virt_to_head_page(buf); 1490 1491 truesize = mergeable_ctx_to_truesize(ctx); 1492 headroom = mergeable_ctx_to_headroom(ctx); 1493 tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1494 room = SKB_DATA_ALIGN(headroom + tailroom); 1495 if (unlikely(len > truesize - room)) { 1496 pr_debug("%s: rx error: len %u exceeds truesize %lu\n", 1497 dev->name, len, (unsigned long)(truesize - room)); 1498 dev->stats.rx_length_errors++; 1499 goto err_skb; 1500 } 1501 1502 num_skb_frags = skb_shinfo(curr_skb)->nr_frags; 1503 if (unlikely(num_skb_frags == MAX_SKB_FRAGS)) { 1504 struct sk_buff *nskb = alloc_skb(0, GFP_ATOMIC); 1505 1506 if (unlikely(!nskb)) 1507 goto err_skb; 1508 if (curr_skb == head_skb) 1509 skb_shinfo(curr_skb)->frag_list = nskb; 1510 else 1511 curr_skb->next = nskb; 1512 curr_skb = nskb; 1513 head_skb->truesize += nskb->truesize; 1514 num_skb_frags = 0; 1515 } 1516 if (curr_skb != head_skb) { 1517 head_skb->data_len += len; 1518 head_skb->len += len; 1519 head_skb->truesize += truesize; 1520 } 1521 offset = buf - page_address(page); 1522 if (skb_can_coalesce(curr_skb, num_skb_frags, page, offset)) { 1523 put_page(page); 1524 skb_coalesce_rx_frag(curr_skb, num_skb_frags - 1, 1525 len, truesize); 1526 } else { 1527 skb_add_rx_frag(curr_skb, num_skb_frags, page, 1528 offset, len, truesize); 1529 } 1530 } 1531 1532 ewma_pkt_len_add(&rq->mrg_avg_pkt_len, head_skb->len); 1533 return head_skb; 1534 1535 err_skb: 1536 put_page(page); 1537 mergeable_buf_free(rq, num_buf, dev, stats); 1538 1539 err_buf: 1540 stats->drops++; 1541 dev_kfree_skb(head_skb); 1542 return NULL; 1543 } 1544 1545 static void virtio_skb_set_hash(const struct virtio_net_hdr_v1_hash *hdr_hash, 1546 struct sk_buff *skb) 1547 { 1548 enum pkt_hash_types rss_hash_type; 1549 1550 if (!hdr_hash || !skb) 1551 return; 1552 1553 switch (__le16_to_cpu(hdr_hash->hash_report)) { 1554 case VIRTIO_NET_HASH_REPORT_TCPv4: 1555 case VIRTIO_NET_HASH_REPORT_UDPv4: 1556 case VIRTIO_NET_HASH_REPORT_TCPv6: 1557 case VIRTIO_NET_HASH_REPORT_UDPv6: 1558 case VIRTIO_NET_HASH_REPORT_TCPv6_EX: 1559 case VIRTIO_NET_HASH_REPORT_UDPv6_EX: 1560 rss_hash_type = PKT_HASH_TYPE_L4; 1561 break; 1562 case VIRTIO_NET_HASH_REPORT_IPv4: 1563 case VIRTIO_NET_HASH_REPORT_IPv6: 1564 case VIRTIO_NET_HASH_REPORT_IPv6_EX: 1565 rss_hash_type = PKT_HASH_TYPE_L3; 1566 break; 1567 case VIRTIO_NET_HASH_REPORT_NONE: 1568 default: 1569 rss_hash_type = PKT_HASH_TYPE_NONE; 1570 } 1571 skb_set_hash(skb, __le32_to_cpu(hdr_hash->hash_value), rss_hash_type); 1572 } 1573 1574 static void receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 1575 void *buf, unsigned int len, void **ctx, 1576 unsigned int *xdp_xmit, 1577 struct virtnet_rq_stats *stats) 1578 { 1579 struct net_device *dev = vi->dev; 1580 struct sk_buff *skb; 1581 struct virtio_net_hdr_mrg_rxbuf *hdr; 1582 1583 if (unlikely(len < vi->hdr_len + ETH_HLEN)) { 1584 pr_debug("%s: short packet %i\n", dev->name, len); 1585 dev->stats.rx_length_errors++; 1586 virtnet_rq_free_unused_buf(rq->vq, buf); 1587 return; 1588 } 1589 1590 if (vi->mergeable_rx_bufs) 1591 skb = receive_mergeable(dev, vi, rq, buf, ctx, len, xdp_xmit, 1592 stats); 1593 else if (vi->big_packets) 1594 skb = receive_big(dev, vi, rq, buf, len, stats); 1595 else 1596 skb = receive_small(dev, vi, rq, buf, ctx, len, xdp_xmit, stats); 1597 1598 if (unlikely(!skb)) 1599 return; 1600 1601 hdr = skb_vnet_hdr(skb); 1602 if (dev->features & NETIF_F_RXHASH && vi->has_rss_hash_report) 1603 virtio_skb_set_hash((const struct virtio_net_hdr_v1_hash *)hdr, skb); 1604 1605 if (hdr->hdr.flags & VIRTIO_NET_HDR_F_DATA_VALID) 1606 skb->ip_summed = CHECKSUM_UNNECESSARY; 1607 1608 if (virtio_net_hdr_to_skb(skb, &hdr->hdr, 1609 virtio_is_little_endian(vi->vdev))) { 1610 net_warn_ratelimited("%s: bad gso: type: %u, size: %u\n", 1611 dev->name, hdr->hdr.gso_type, 1612 hdr->hdr.gso_size); 1613 goto frame_err; 1614 } 1615 1616 skb_record_rx_queue(skb, vq2rxq(rq->vq)); 1617 skb->protocol = eth_type_trans(skb, dev); 1618 pr_debug("Receiving skb proto 0x%04x len %i type %i\n", 1619 ntohs(skb->protocol), skb->len, skb->pkt_type); 1620 1621 napi_gro_receive(&rq->napi, skb); 1622 return; 1623 1624 frame_err: 1625 dev->stats.rx_frame_errors++; 1626 dev_kfree_skb(skb); 1627 } 1628 1629 /* Unlike mergeable buffers, all buffers are allocated to the 1630 * same size, except for the headroom. For this reason we do 1631 * not need to use mergeable_len_to_ctx here - it is enough 1632 * to store the headroom as the context ignoring the truesize. 1633 */ 1634 static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 1635 gfp_t gfp) 1636 { 1637 struct page_frag *alloc_frag = &rq->alloc_frag; 1638 char *buf; 1639 unsigned int xdp_headroom = virtnet_get_headroom(vi); 1640 void *ctx = (void *)(unsigned long)xdp_headroom; 1641 int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom; 1642 int err; 1643 1644 len = SKB_DATA_ALIGN(len) + 1645 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1646 if (unlikely(!skb_page_frag_refill(len, alloc_frag, gfp))) 1647 return -ENOMEM; 1648 1649 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1650 get_page(alloc_frag->page); 1651 alloc_frag->offset += len; 1652 sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom, 1653 vi->hdr_len + GOOD_PACKET_LEN); 1654 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1655 if (err < 0) 1656 put_page(virt_to_head_page(buf)); 1657 return err; 1658 } 1659 1660 static int add_recvbuf_big(struct virtnet_info *vi, struct receive_queue *rq, 1661 gfp_t gfp) 1662 { 1663 struct page *first, *list = NULL; 1664 char *p; 1665 int i, err, offset; 1666 1667 sg_init_table(rq->sg, vi->big_packets_num_skbfrags + 2); 1668 1669 /* page in rq->sg[vi->big_packets_num_skbfrags + 1] is list tail */ 1670 for (i = vi->big_packets_num_skbfrags + 1; i > 1; --i) { 1671 first = get_a_page(rq, gfp); 1672 if (!first) { 1673 if (list) 1674 give_pages(rq, list); 1675 return -ENOMEM; 1676 } 1677 sg_set_buf(&rq->sg[i], page_address(first), PAGE_SIZE); 1678 1679 /* chain new page in list head to match sg */ 1680 first->private = (unsigned long)list; 1681 list = first; 1682 } 1683 1684 first = get_a_page(rq, gfp); 1685 if (!first) { 1686 give_pages(rq, list); 1687 return -ENOMEM; 1688 } 1689 p = page_address(first); 1690 1691 /* rq->sg[0], rq->sg[1] share the same page */ 1692 /* a separated rq->sg[0] for header - required in case !any_header_sg */ 1693 sg_set_buf(&rq->sg[0], p, vi->hdr_len); 1694 1695 /* rq->sg[1] for data packet, from offset */ 1696 offset = sizeof(struct padded_vnet_hdr); 1697 sg_set_buf(&rq->sg[1], p + offset, PAGE_SIZE - offset); 1698 1699 /* chain first in list head */ 1700 first->private = (unsigned long)list; 1701 err = virtqueue_add_inbuf(rq->vq, rq->sg, vi->big_packets_num_skbfrags + 2, 1702 first, gfp); 1703 if (err < 0) 1704 give_pages(rq, first); 1705 1706 return err; 1707 } 1708 1709 static unsigned int get_mergeable_buf_len(struct receive_queue *rq, 1710 struct ewma_pkt_len *avg_pkt_len, 1711 unsigned int room) 1712 { 1713 struct virtnet_info *vi = rq->vq->vdev->priv; 1714 const size_t hdr_len = vi->hdr_len; 1715 unsigned int len; 1716 1717 if (room) 1718 return PAGE_SIZE - room; 1719 1720 len = hdr_len + clamp_t(unsigned int, ewma_pkt_len_read(avg_pkt_len), 1721 rq->min_buf_len, PAGE_SIZE - hdr_len); 1722 1723 return ALIGN(len, L1_CACHE_BYTES); 1724 } 1725 1726 static int add_recvbuf_mergeable(struct virtnet_info *vi, 1727 struct receive_queue *rq, gfp_t gfp) 1728 { 1729 struct page_frag *alloc_frag = &rq->alloc_frag; 1730 unsigned int headroom = virtnet_get_headroom(vi); 1731 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 1732 unsigned int room = SKB_DATA_ALIGN(headroom + tailroom); 1733 char *buf; 1734 void *ctx; 1735 int err; 1736 unsigned int len, hole; 1737 1738 /* Extra tailroom is needed to satisfy XDP's assumption. This 1739 * means rx frags coalescing won't work, but consider we've 1740 * disabled GSO for XDP, it won't be a big issue. 1741 */ 1742 len = get_mergeable_buf_len(rq, &rq->mrg_avg_pkt_len, room); 1743 if (unlikely(!skb_page_frag_refill(len + room, alloc_frag, gfp))) 1744 return -ENOMEM; 1745 1746 buf = (char *)page_address(alloc_frag->page) + alloc_frag->offset; 1747 buf += headroom; /* advance address leaving hole at front of pkt */ 1748 get_page(alloc_frag->page); 1749 alloc_frag->offset += len + room; 1750 hole = alloc_frag->size - alloc_frag->offset; 1751 if (hole < len + room) { 1752 /* To avoid internal fragmentation, if there is very likely not 1753 * enough space for another buffer, add the remaining space to 1754 * the current buffer. 1755 * XDP core assumes that frame_size of xdp_buff and the length 1756 * of the frag are PAGE_SIZE, so we disable the hole mechanism. 1757 */ 1758 if (!headroom) 1759 len += hole; 1760 alloc_frag->offset += hole; 1761 } 1762 1763 sg_init_one(rq->sg, buf, len); 1764 ctx = mergeable_len_to_ctx(len + room, headroom); 1765 err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp); 1766 if (err < 0) 1767 put_page(virt_to_head_page(buf)); 1768 1769 return err; 1770 } 1771 1772 /* 1773 * Returns false if we couldn't fill entirely (OOM). 1774 * 1775 * Normally run in the receive path, but can also be run from ndo_open 1776 * before we're receiving packets, or from refill_work which is 1777 * careful to disable receiving (using napi_disable). 1778 */ 1779 static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq, 1780 gfp_t gfp) 1781 { 1782 int err; 1783 bool oom; 1784 1785 do { 1786 if (vi->mergeable_rx_bufs) 1787 err = add_recvbuf_mergeable(vi, rq, gfp); 1788 else if (vi->big_packets) 1789 err = add_recvbuf_big(vi, rq, gfp); 1790 else 1791 err = add_recvbuf_small(vi, rq, gfp); 1792 1793 oom = err == -ENOMEM; 1794 if (err) 1795 break; 1796 } while (rq->vq->num_free); 1797 if (virtqueue_kick_prepare(rq->vq) && virtqueue_notify(rq->vq)) { 1798 unsigned long flags; 1799 1800 flags = u64_stats_update_begin_irqsave(&rq->stats.syncp); 1801 rq->stats.kicks++; 1802 u64_stats_update_end_irqrestore(&rq->stats.syncp, flags); 1803 } 1804 1805 return !oom; 1806 } 1807 1808 static void skb_recv_done(struct virtqueue *rvq) 1809 { 1810 struct virtnet_info *vi = rvq->vdev->priv; 1811 struct receive_queue *rq = &vi->rq[vq2rxq(rvq)]; 1812 1813 virtqueue_napi_schedule(&rq->napi, rvq); 1814 } 1815 1816 static void virtnet_napi_enable(struct virtqueue *vq, struct napi_struct *napi) 1817 { 1818 napi_enable(napi); 1819 1820 /* If all buffers were filled by other side before we napi_enabled, we 1821 * won't get another interrupt, so process any outstanding packets now. 1822 * Call local_bh_enable after to trigger softIRQ processing. 1823 */ 1824 local_bh_disable(); 1825 virtqueue_napi_schedule(napi, vq); 1826 local_bh_enable(); 1827 } 1828 1829 static void virtnet_napi_tx_enable(struct virtnet_info *vi, 1830 struct virtqueue *vq, 1831 struct napi_struct *napi) 1832 { 1833 if (!napi->weight) 1834 return; 1835 1836 /* Tx napi touches cachelines on the cpu handling tx interrupts. Only 1837 * enable the feature if this is likely affine with the transmit path. 1838 */ 1839 if (!vi->affinity_hint_set) { 1840 napi->weight = 0; 1841 return; 1842 } 1843 1844 return virtnet_napi_enable(vq, napi); 1845 } 1846 1847 static void virtnet_napi_tx_disable(struct napi_struct *napi) 1848 { 1849 if (napi->weight) 1850 napi_disable(napi); 1851 } 1852 1853 static void refill_work(struct work_struct *work) 1854 { 1855 struct virtnet_info *vi = 1856 container_of(work, struct virtnet_info, refill.work); 1857 bool still_empty; 1858 int i; 1859 1860 for (i = 0; i < vi->curr_queue_pairs; i++) { 1861 struct receive_queue *rq = &vi->rq[i]; 1862 1863 napi_disable(&rq->napi); 1864 still_empty = !try_fill_recv(vi, rq, GFP_KERNEL); 1865 virtnet_napi_enable(rq->vq, &rq->napi); 1866 1867 /* In theory, this can happen: if we don't get any buffers in 1868 * we will *never* try to fill again. 1869 */ 1870 if (still_empty) 1871 schedule_delayed_work(&vi->refill, HZ/2); 1872 } 1873 } 1874 1875 static int virtnet_receive(struct receive_queue *rq, int budget, 1876 unsigned int *xdp_xmit) 1877 { 1878 struct virtnet_info *vi = rq->vq->vdev->priv; 1879 struct virtnet_rq_stats stats = {}; 1880 unsigned int len; 1881 void *buf; 1882 int i; 1883 1884 if (!vi->big_packets || vi->mergeable_rx_bufs) { 1885 void *ctx; 1886 1887 while (stats.packets < budget && 1888 (buf = virtqueue_get_buf_ctx(rq->vq, &len, &ctx))) { 1889 receive_buf(vi, rq, buf, len, ctx, xdp_xmit, &stats); 1890 stats.packets++; 1891 } 1892 } else { 1893 while (stats.packets < budget && 1894 (buf = virtqueue_get_buf(rq->vq, &len)) != NULL) { 1895 receive_buf(vi, rq, buf, len, NULL, xdp_xmit, &stats); 1896 stats.packets++; 1897 } 1898 } 1899 1900 if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { 1901 if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { 1902 spin_lock(&vi->refill_lock); 1903 if (vi->refill_enabled) 1904 schedule_delayed_work(&vi->refill, 0); 1905 spin_unlock(&vi->refill_lock); 1906 } 1907 } 1908 1909 u64_stats_update_begin(&rq->stats.syncp); 1910 for (i = 0; i < VIRTNET_RQ_STATS_LEN; i++) { 1911 size_t offset = virtnet_rq_stats_desc[i].offset; 1912 u64 *item; 1913 1914 item = (u64 *)((u8 *)&rq->stats + offset); 1915 *item += *(u64 *)((u8 *)&stats + offset); 1916 } 1917 u64_stats_update_end(&rq->stats.syncp); 1918 1919 return stats.packets; 1920 } 1921 1922 static void virtnet_poll_cleantx(struct receive_queue *rq) 1923 { 1924 struct virtnet_info *vi = rq->vq->vdev->priv; 1925 unsigned int index = vq2rxq(rq->vq); 1926 struct send_queue *sq = &vi->sq[index]; 1927 struct netdev_queue *txq = netdev_get_tx_queue(vi->dev, index); 1928 1929 if (!sq->napi.weight || is_xdp_raw_buffer_queue(vi, index)) 1930 return; 1931 1932 if (__netif_tx_trylock(txq)) { 1933 if (sq->reset) { 1934 __netif_tx_unlock(txq); 1935 return; 1936 } 1937 1938 do { 1939 virtqueue_disable_cb(sq->vq); 1940 free_old_xmit_skbs(sq, true); 1941 } while (unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 1942 1943 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 1944 netif_tx_wake_queue(txq); 1945 1946 __netif_tx_unlock(txq); 1947 } 1948 } 1949 1950 static int virtnet_poll(struct napi_struct *napi, int budget) 1951 { 1952 struct receive_queue *rq = 1953 container_of(napi, struct receive_queue, napi); 1954 struct virtnet_info *vi = rq->vq->vdev->priv; 1955 struct send_queue *sq; 1956 unsigned int received; 1957 unsigned int xdp_xmit = 0; 1958 1959 virtnet_poll_cleantx(rq); 1960 1961 received = virtnet_receive(rq, budget, &xdp_xmit); 1962 1963 if (xdp_xmit & VIRTIO_XDP_REDIR) 1964 xdp_do_flush(); 1965 1966 /* Out of packets? */ 1967 if (received < budget) 1968 virtqueue_napi_complete(napi, rq->vq, received); 1969 1970 if (xdp_xmit & VIRTIO_XDP_TX) { 1971 sq = virtnet_xdp_get_sq(vi); 1972 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 1973 u64_stats_update_begin(&sq->stats.syncp); 1974 sq->stats.kicks++; 1975 u64_stats_update_end(&sq->stats.syncp); 1976 } 1977 virtnet_xdp_put_sq(vi, sq); 1978 } 1979 1980 return received; 1981 } 1982 1983 static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index) 1984 { 1985 virtnet_napi_tx_disable(&vi->sq[qp_index].napi); 1986 napi_disable(&vi->rq[qp_index].napi); 1987 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); 1988 } 1989 1990 static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index) 1991 { 1992 struct net_device *dev = vi->dev; 1993 int err; 1994 1995 err = xdp_rxq_info_reg(&vi->rq[qp_index].xdp_rxq, dev, qp_index, 1996 vi->rq[qp_index].napi.napi_id); 1997 if (err < 0) 1998 return err; 1999 2000 err = xdp_rxq_info_reg_mem_model(&vi->rq[qp_index].xdp_rxq, 2001 MEM_TYPE_PAGE_SHARED, NULL); 2002 if (err < 0) 2003 goto err_xdp_reg_mem_model; 2004 2005 virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi); 2006 virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi); 2007 2008 return 0; 2009 2010 err_xdp_reg_mem_model: 2011 xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq); 2012 return err; 2013 } 2014 2015 static int virtnet_open(struct net_device *dev) 2016 { 2017 struct virtnet_info *vi = netdev_priv(dev); 2018 int i, err; 2019 2020 enable_delayed_refill(vi); 2021 2022 for (i = 0; i < vi->max_queue_pairs; i++) { 2023 if (i < vi->curr_queue_pairs) 2024 /* Make sure we have some buffers: if oom use wq. */ 2025 if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) 2026 schedule_delayed_work(&vi->refill, 0); 2027 2028 err = virtnet_enable_queue_pair(vi, i); 2029 if (err < 0) 2030 goto err_enable_qp; 2031 } 2032 2033 return 0; 2034 2035 err_enable_qp: 2036 disable_delayed_refill(vi); 2037 cancel_delayed_work_sync(&vi->refill); 2038 2039 for (i--; i >= 0; i--) 2040 virtnet_disable_queue_pair(vi, i); 2041 return err; 2042 } 2043 2044 static int virtnet_poll_tx(struct napi_struct *napi, int budget) 2045 { 2046 struct send_queue *sq = container_of(napi, struct send_queue, napi); 2047 struct virtnet_info *vi = sq->vq->vdev->priv; 2048 unsigned int index = vq2txq(sq->vq); 2049 struct netdev_queue *txq; 2050 int opaque; 2051 bool done; 2052 2053 if (unlikely(is_xdp_raw_buffer_queue(vi, index))) { 2054 /* We don't need to enable cb for XDP */ 2055 napi_complete_done(napi, 0); 2056 return 0; 2057 } 2058 2059 txq = netdev_get_tx_queue(vi->dev, index); 2060 __netif_tx_lock(txq, raw_smp_processor_id()); 2061 virtqueue_disable_cb(sq->vq); 2062 free_old_xmit_skbs(sq, true); 2063 2064 if (sq->vq->num_free >= 2 + MAX_SKB_FRAGS) 2065 netif_tx_wake_queue(txq); 2066 2067 opaque = virtqueue_enable_cb_prepare(sq->vq); 2068 2069 done = napi_complete_done(napi, 0); 2070 2071 if (!done) 2072 virtqueue_disable_cb(sq->vq); 2073 2074 __netif_tx_unlock(txq); 2075 2076 if (done) { 2077 if (unlikely(virtqueue_poll(sq->vq, opaque))) { 2078 if (napi_schedule_prep(napi)) { 2079 __netif_tx_lock(txq, raw_smp_processor_id()); 2080 virtqueue_disable_cb(sq->vq); 2081 __netif_tx_unlock(txq); 2082 __napi_schedule(napi); 2083 } 2084 } 2085 } 2086 2087 return 0; 2088 } 2089 2090 static int xmit_skb(struct send_queue *sq, struct sk_buff *skb) 2091 { 2092 struct virtio_net_hdr_mrg_rxbuf *hdr; 2093 const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest; 2094 struct virtnet_info *vi = sq->vq->vdev->priv; 2095 int num_sg; 2096 unsigned hdr_len = vi->hdr_len; 2097 bool can_push; 2098 2099 pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest); 2100 2101 can_push = vi->any_header_sg && 2102 !((unsigned long)skb->data & (__alignof__(*hdr) - 1)) && 2103 !skb_header_cloned(skb) && skb_headroom(skb) >= hdr_len; 2104 /* Even if we can, don't push here yet as this would skew 2105 * csum_start offset below. */ 2106 if (can_push) 2107 hdr = (struct virtio_net_hdr_mrg_rxbuf *)(skb->data - hdr_len); 2108 else 2109 hdr = skb_vnet_hdr(skb); 2110 2111 if (virtio_net_hdr_from_skb(skb, &hdr->hdr, 2112 virtio_is_little_endian(vi->vdev), false, 2113 0)) 2114 return -EPROTO; 2115 2116 if (vi->mergeable_rx_bufs) 2117 hdr->num_buffers = 0; 2118 2119 sg_init_table(sq->sg, skb_shinfo(skb)->nr_frags + (can_push ? 1 : 2)); 2120 if (can_push) { 2121 __skb_push(skb, hdr_len); 2122 num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len); 2123 if (unlikely(num_sg < 0)) 2124 return num_sg; 2125 /* Pull header back to avoid skew in tx bytes calculations. */ 2126 __skb_pull(skb, hdr_len); 2127 } else { 2128 sg_set_buf(sq->sg, hdr, hdr_len); 2129 num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len); 2130 if (unlikely(num_sg < 0)) 2131 return num_sg; 2132 num_sg++; 2133 } 2134 return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC); 2135 } 2136 2137 static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) 2138 { 2139 struct virtnet_info *vi = netdev_priv(dev); 2140 int qnum = skb_get_queue_mapping(skb); 2141 struct send_queue *sq = &vi->sq[qnum]; 2142 int err; 2143 struct netdev_queue *txq = netdev_get_tx_queue(dev, qnum); 2144 bool kick = !netdev_xmit_more(); 2145 bool use_napi = sq->napi.weight; 2146 2147 /* Free up any pending old buffers before queueing new ones. */ 2148 do { 2149 if (use_napi) 2150 virtqueue_disable_cb(sq->vq); 2151 2152 free_old_xmit_skbs(sq, false); 2153 2154 } while (use_napi && kick && 2155 unlikely(!virtqueue_enable_cb_delayed(sq->vq))); 2156 2157 /* timestamp packet in software */ 2158 skb_tx_timestamp(skb); 2159 2160 /* Try to transmit */ 2161 err = xmit_skb(sq, skb); 2162 2163 /* This should not happen! */ 2164 if (unlikely(err)) { 2165 dev->stats.tx_fifo_errors++; 2166 if (net_ratelimit()) 2167 dev_warn(&dev->dev, 2168 "Unexpected TXQ (%d) queue failure: %d\n", 2169 qnum, err); 2170 dev->stats.tx_dropped++; 2171 dev_kfree_skb_any(skb); 2172 return NETDEV_TX_OK; 2173 } 2174 2175 /* Don't wait up for transmitted skbs to be freed. */ 2176 if (!use_napi) { 2177 skb_orphan(skb); 2178 nf_reset_ct(skb); 2179 } 2180 2181 check_sq_full_and_disable(vi, dev, sq); 2182 2183 if (kick || netif_xmit_stopped(txq)) { 2184 if (virtqueue_kick_prepare(sq->vq) && virtqueue_notify(sq->vq)) { 2185 u64_stats_update_begin(&sq->stats.syncp); 2186 sq->stats.kicks++; 2187 u64_stats_update_end(&sq->stats.syncp); 2188 } 2189 } 2190 2191 return NETDEV_TX_OK; 2192 } 2193 2194 static int virtnet_rx_resize(struct virtnet_info *vi, 2195 struct receive_queue *rq, u32 ring_num) 2196 { 2197 bool running = netif_running(vi->dev); 2198 int err, qindex; 2199 2200 qindex = rq - vi->rq; 2201 2202 if (running) 2203 napi_disable(&rq->napi); 2204 2205 err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); 2206 if (err) 2207 netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); 2208 2209 if (!try_fill_recv(vi, rq, GFP_KERNEL)) 2210 schedule_delayed_work(&vi->refill, 0); 2211 2212 if (running) 2213 virtnet_napi_enable(rq->vq, &rq->napi); 2214 return err; 2215 } 2216 2217 static int virtnet_tx_resize(struct virtnet_info *vi, 2218 struct send_queue *sq, u32 ring_num) 2219 { 2220 bool running = netif_running(vi->dev); 2221 struct netdev_queue *txq; 2222 int err, qindex; 2223 2224 qindex = sq - vi->sq; 2225 2226 if (running) 2227 virtnet_napi_tx_disable(&sq->napi); 2228 2229 txq = netdev_get_tx_queue(vi->dev, qindex); 2230 2231 /* 1. wait all ximt complete 2232 * 2. fix the race of netif_stop_subqueue() vs netif_start_subqueue() 2233 */ 2234 __netif_tx_lock_bh(txq); 2235 2236 /* Prevent rx poll from accessing sq. */ 2237 sq->reset = true; 2238 2239 /* Prevent the upper layer from trying to send packets. */ 2240 netif_stop_subqueue(vi->dev, qindex); 2241 2242 __netif_tx_unlock_bh(txq); 2243 2244 err = virtqueue_resize(sq->vq, ring_num, virtnet_sq_free_unused_buf); 2245 if (err) 2246 netdev_err(vi->dev, "resize tx fail: tx queue index: %d err: %d\n", qindex, err); 2247 2248 __netif_tx_lock_bh(txq); 2249 sq->reset = false; 2250 netif_tx_wake_queue(txq); 2251 __netif_tx_unlock_bh(txq); 2252 2253 if (running) 2254 virtnet_napi_tx_enable(vi, sq->vq, &sq->napi); 2255 return err; 2256 } 2257 2258 /* 2259 * Send command via the control virtqueue and check status. Commands 2260 * supported by the hypervisor, as indicated by feature bits, should 2261 * never fail unless improperly formatted. 2262 */ 2263 static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, 2264 struct scatterlist *out) 2265 { 2266 struct scatterlist *sgs[4], hdr, stat; 2267 unsigned out_num = 0, tmp; 2268 int ret; 2269 2270 /* Caller should know better */ 2271 BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)); 2272 2273 vi->ctrl->status = ~0; 2274 vi->ctrl->hdr.class = class; 2275 vi->ctrl->hdr.cmd = cmd; 2276 /* Add header */ 2277 sg_init_one(&hdr, &vi->ctrl->hdr, sizeof(vi->ctrl->hdr)); 2278 sgs[out_num++] = &hdr; 2279 2280 if (out) 2281 sgs[out_num++] = out; 2282 2283 /* Add return status. */ 2284 sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status)); 2285 sgs[out_num] = &stat; 2286 2287 BUG_ON(out_num + 1 > ARRAY_SIZE(sgs)); 2288 ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC); 2289 if (ret < 0) { 2290 dev_warn(&vi->vdev->dev, 2291 "Failed to add sgs for command vq: %d\n.", ret); 2292 return false; 2293 } 2294 2295 if (unlikely(!virtqueue_kick(vi->cvq))) 2296 return vi->ctrl->status == VIRTIO_NET_OK; 2297 2298 /* Spin for a response, the kick causes an ioport write, trapping 2299 * into the hypervisor, so the request should be handled immediately. 2300 */ 2301 while (!virtqueue_get_buf(vi->cvq, &tmp) && 2302 !virtqueue_is_broken(vi->cvq)) 2303 cpu_relax(); 2304 2305 return vi->ctrl->status == VIRTIO_NET_OK; 2306 } 2307 2308 static int virtnet_set_mac_address(struct net_device *dev, void *p) 2309 { 2310 struct virtnet_info *vi = netdev_priv(dev); 2311 struct virtio_device *vdev = vi->vdev; 2312 int ret; 2313 struct sockaddr *addr; 2314 struct scatterlist sg; 2315 2316 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 2317 return -EOPNOTSUPP; 2318 2319 addr = kmemdup(p, sizeof(*addr), GFP_KERNEL); 2320 if (!addr) 2321 return -ENOMEM; 2322 2323 ret = eth_prepare_mac_addr_change(dev, addr); 2324 if (ret) 2325 goto out; 2326 2327 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 2328 sg_init_one(&sg, addr->sa_data, dev->addr_len); 2329 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2330 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 2331 dev_warn(&vdev->dev, 2332 "Failed to set mac address by vq command.\n"); 2333 ret = -EINVAL; 2334 goto out; 2335 } 2336 } else if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 2337 !virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) { 2338 unsigned int i; 2339 2340 /* Naturally, this has an atomicity problem. */ 2341 for (i = 0; i < dev->addr_len; i++) 2342 virtio_cwrite8(vdev, 2343 offsetof(struct virtio_net_config, mac) + 2344 i, addr->sa_data[i]); 2345 } 2346 2347 eth_commit_mac_addr_change(dev, p); 2348 ret = 0; 2349 2350 out: 2351 kfree(addr); 2352 return ret; 2353 } 2354 2355 static void virtnet_stats(struct net_device *dev, 2356 struct rtnl_link_stats64 *tot) 2357 { 2358 struct virtnet_info *vi = netdev_priv(dev); 2359 unsigned int start; 2360 int i; 2361 2362 for (i = 0; i < vi->max_queue_pairs; i++) { 2363 u64 tpackets, tbytes, terrors, rpackets, rbytes, rdrops; 2364 struct receive_queue *rq = &vi->rq[i]; 2365 struct send_queue *sq = &vi->sq[i]; 2366 2367 do { 2368 start = u64_stats_fetch_begin(&sq->stats.syncp); 2369 tpackets = sq->stats.packets; 2370 tbytes = sq->stats.bytes; 2371 terrors = sq->stats.tx_timeouts; 2372 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 2373 2374 do { 2375 start = u64_stats_fetch_begin(&rq->stats.syncp); 2376 rpackets = rq->stats.packets; 2377 rbytes = rq->stats.bytes; 2378 rdrops = rq->stats.drops; 2379 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2380 2381 tot->rx_packets += rpackets; 2382 tot->tx_packets += tpackets; 2383 tot->rx_bytes += rbytes; 2384 tot->tx_bytes += tbytes; 2385 tot->rx_dropped += rdrops; 2386 tot->tx_errors += terrors; 2387 } 2388 2389 tot->tx_dropped = dev->stats.tx_dropped; 2390 tot->tx_fifo_errors = dev->stats.tx_fifo_errors; 2391 tot->rx_length_errors = dev->stats.rx_length_errors; 2392 tot->rx_frame_errors = dev->stats.rx_frame_errors; 2393 } 2394 2395 static void virtnet_ack_link_announce(struct virtnet_info *vi) 2396 { 2397 rtnl_lock(); 2398 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_ANNOUNCE, 2399 VIRTIO_NET_CTRL_ANNOUNCE_ACK, NULL)) 2400 dev_warn(&vi->dev->dev, "Failed to ack link announce.\n"); 2401 rtnl_unlock(); 2402 } 2403 2404 static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2405 { 2406 struct scatterlist sg; 2407 struct net_device *dev = vi->dev; 2408 2409 if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ)) 2410 return 0; 2411 2412 vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs); 2413 sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq)); 2414 2415 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2416 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) { 2417 dev_warn(&dev->dev, "Fail to set num of queue pairs to %d\n", 2418 queue_pairs); 2419 return -EINVAL; 2420 } else { 2421 vi->curr_queue_pairs = queue_pairs; 2422 /* virtnet_open() will refill when device is going to up. */ 2423 if (dev->flags & IFF_UP) 2424 schedule_delayed_work(&vi->refill, 0); 2425 } 2426 2427 return 0; 2428 } 2429 2430 static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs) 2431 { 2432 int err; 2433 2434 rtnl_lock(); 2435 err = _virtnet_set_queues(vi, queue_pairs); 2436 rtnl_unlock(); 2437 return err; 2438 } 2439 2440 static int virtnet_close(struct net_device *dev) 2441 { 2442 struct virtnet_info *vi = netdev_priv(dev); 2443 int i; 2444 2445 /* Make sure NAPI doesn't schedule refill work */ 2446 disable_delayed_refill(vi); 2447 /* Make sure refill_work doesn't re-enable napi! */ 2448 cancel_delayed_work_sync(&vi->refill); 2449 2450 for (i = 0; i < vi->max_queue_pairs; i++) 2451 virtnet_disable_queue_pair(vi, i); 2452 2453 return 0; 2454 } 2455 2456 static void virtnet_set_rx_mode(struct net_device *dev) 2457 { 2458 struct virtnet_info *vi = netdev_priv(dev); 2459 struct scatterlist sg[2]; 2460 struct virtio_net_ctrl_mac *mac_data; 2461 struct netdev_hw_addr *ha; 2462 int uc_count; 2463 int mc_count; 2464 void *buf; 2465 int i; 2466 2467 /* We can't dynamically set ndo_set_rx_mode, so return gracefully */ 2468 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX)) 2469 return; 2470 2471 vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0); 2472 vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0); 2473 2474 sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc)); 2475 2476 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2477 VIRTIO_NET_CTRL_RX_PROMISC, sg)) 2478 dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", 2479 vi->ctrl->promisc ? "en" : "dis"); 2480 2481 sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti)); 2482 2483 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, 2484 VIRTIO_NET_CTRL_RX_ALLMULTI, sg)) 2485 dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n", 2486 vi->ctrl->allmulti ? "en" : "dis"); 2487 2488 uc_count = netdev_uc_count(dev); 2489 mc_count = netdev_mc_count(dev); 2490 /* MAC filter - use one buffer for both lists */ 2491 buf = kzalloc(((uc_count + mc_count) * ETH_ALEN) + 2492 (2 * sizeof(mac_data->entries)), GFP_ATOMIC); 2493 mac_data = buf; 2494 if (!buf) 2495 return; 2496 2497 sg_init_table(sg, 2); 2498 2499 /* Store the unicast list and count in the front of the buffer */ 2500 mac_data->entries = cpu_to_virtio32(vi->vdev, uc_count); 2501 i = 0; 2502 netdev_for_each_uc_addr(ha, dev) 2503 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2504 2505 sg_set_buf(&sg[0], mac_data, 2506 sizeof(mac_data->entries) + (uc_count * ETH_ALEN)); 2507 2508 /* multicast list and count fill the end */ 2509 mac_data = (void *)&mac_data->macs[uc_count][0]; 2510 2511 mac_data->entries = cpu_to_virtio32(vi->vdev, mc_count); 2512 i = 0; 2513 netdev_for_each_mc_addr(ha, dev) 2514 memcpy(&mac_data->macs[i++][0], ha->addr, ETH_ALEN); 2515 2516 sg_set_buf(&sg[1], mac_data, 2517 sizeof(mac_data->entries) + (mc_count * ETH_ALEN)); 2518 2519 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 2520 VIRTIO_NET_CTRL_MAC_TABLE_SET, sg)) 2521 dev_warn(&dev->dev, "Failed to set MAC filter table.\n"); 2522 2523 kfree(buf); 2524 } 2525 2526 static int virtnet_vlan_rx_add_vid(struct net_device *dev, 2527 __be16 proto, u16 vid) 2528 { 2529 struct virtnet_info *vi = netdev_priv(dev); 2530 struct scatterlist sg; 2531 2532 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2533 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2534 2535 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2536 VIRTIO_NET_CTRL_VLAN_ADD, &sg)) 2537 dev_warn(&dev->dev, "Failed to add VLAN ID %d.\n", vid); 2538 return 0; 2539 } 2540 2541 static int virtnet_vlan_rx_kill_vid(struct net_device *dev, 2542 __be16 proto, u16 vid) 2543 { 2544 struct virtnet_info *vi = netdev_priv(dev); 2545 struct scatterlist sg; 2546 2547 vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid); 2548 sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid)); 2549 2550 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, 2551 VIRTIO_NET_CTRL_VLAN_DEL, &sg)) 2552 dev_warn(&dev->dev, "Failed to kill VLAN ID %d.\n", vid); 2553 return 0; 2554 } 2555 2556 static void virtnet_clean_affinity(struct virtnet_info *vi) 2557 { 2558 int i; 2559 2560 if (vi->affinity_hint_set) { 2561 for (i = 0; i < vi->max_queue_pairs; i++) { 2562 virtqueue_set_affinity(vi->rq[i].vq, NULL); 2563 virtqueue_set_affinity(vi->sq[i].vq, NULL); 2564 } 2565 2566 vi->affinity_hint_set = false; 2567 } 2568 } 2569 2570 static void virtnet_set_affinity(struct virtnet_info *vi) 2571 { 2572 cpumask_var_t mask; 2573 int stragglers; 2574 int group_size; 2575 int i, j, cpu; 2576 int num_cpu; 2577 int stride; 2578 2579 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) { 2580 virtnet_clean_affinity(vi); 2581 return; 2582 } 2583 2584 num_cpu = num_online_cpus(); 2585 stride = max_t(int, num_cpu / vi->curr_queue_pairs, 1); 2586 stragglers = num_cpu >= vi->curr_queue_pairs ? 2587 num_cpu % vi->curr_queue_pairs : 2588 0; 2589 cpu = cpumask_first(cpu_online_mask); 2590 2591 for (i = 0; i < vi->curr_queue_pairs; i++) { 2592 group_size = stride + (i < stragglers ? 1 : 0); 2593 2594 for (j = 0; j < group_size; j++) { 2595 cpumask_set_cpu(cpu, mask); 2596 cpu = cpumask_next_wrap(cpu, cpu_online_mask, 2597 nr_cpu_ids, false); 2598 } 2599 virtqueue_set_affinity(vi->rq[i].vq, mask); 2600 virtqueue_set_affinity(vi->sq[i].vq, mask); 2601 __netif_set_xps_queue(vi->dev, cpumask_bits(mask), i, XPS_CPUS); 2602 cpumask_clear(mask); 2603 } 2604 2605 vi->affinity_hint_set = true; 2606 free_cpumask_var(mask); 2607 } 2608 2609 static int virtnet_cpu_online(unsigned int cpu, struct hlist_node *node) 2610 { 2611 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2612 node); 2613 virtnet_set_affinity(vi); 2614 return 0; 2615 } 2616 2617 static int virtnet_cpu_dead(unsigned int cpu, struct hlist_node *node) 2618 { 2619 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2620 node_dead); 2621 virtnet_set_affinity(vi); 2622 return 0; 2623 } 2624 2625 static int virtnet_cpu_down_prep(unsigned int cpu, struct hlist_node *node) 2626 { 2627 struct virtnet_info *vi = hlist_entry_safe(node, struct virtnet_info, 2628 node); 2629 2630 virtnet_clean_affinity(vi); 2631 return 0; 2632 } 2633 2634 static enum cpuhp_state virtionet_online; 2635 2636 static int virtnet_cpu_notif_add(struct virtnet_info *vi) 2637 { 2638 int ret; 2639 2640 ret = cpuhp_state_add_instance_nocalls(virtionet_online, &vi->node); 2641 if (ret) 2642 return ret; 2643 ret = cpuhp_state_add_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2644 &vi->node_dead); 2645 if (!ret) 2646 return ret; 2647 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2648 return ret; 2649 } 2650 2651 static void virtnet_cpu_notif_remove(struct virtnet_info *vi) 2652 { 2653 cpuhp_state_remove_instance_nocalls(virtionet_online, &vi->node); 2654 cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_NET_DEAD, 2655 &vi->node_dead); 2656 } 2657 2658 static void virtnet_get_ringparam(struct net_device *dev, 2659 struct ethtool_ringparam *ring, 2660 struct kernel_ethtool_ringparam *kernel_ring, 2661 struct netlink_ext_ack *extack) 2662 { 2663 struct virtnet_info *vi = netdev_priv(dev); 2664 2665 ring->rx_max_pending = vi->rq[0].vq->num_max; 2666 ring->tx_max_pending = vi->sq[0].vq->num_max; 2667 ring->rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2668 ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2669 } 2670 2671 static int virtnet_set_ringparam(struct net_device *dev, 2672 struct ethtool_ringparam *ring, 2673 struct kernel_ethtool_ringparam *kernel_ring, 2674 struct netlink_ext_ack *extack) 2675 { 2676 struct virtnet_info *vi = netdev_priv(dev); 2677 u32 rx_pending, tx_pending; 2678 struct receive_queue *rq; 2679 struct send_queue *sq; 2680 int i, err; 2681 2682 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 2683 return -EINVAL; 2684 2685 rx_pending = virtqueue_get_vring_size(vi->rq[0].vq); 2686 tx_pending = virtqueue_get_vring_size(vi->sq[0].vq); 2687 2688 if (ring->rx_pending == rx_pending && 2689 ring->tx_pending == tx_pending) 2690 return 0; 2691 2692 if (ring->rx_pending > vi->rq[0].vq->num_max) 2693 return -EINVAL; 2694 2695 if (ring->tx_pending > vi->sq[0].vq->num_max) 2696 return -EINVAL; 2697 2698 for (i = 0; i < vi->max_queue_pairs; i++) { 2699 rq = vi->rq + i; 2700 sq = vi->sq + i; 2701 2702 if (ring->tx_pending != tx_pending) { 2703 err = virtnet_tx_resize(vi, sq, ring->tx_pending); 2704 if (err) 2705 return err; 2706 } 2707 2708 if (ring->rx_pending != rx_pending) { 2709 err = virtnet_rx_resize(vi, rq, ring->rx_pending); 2710 if (err) 2711 return err; 2712 } 2713 } 2714 2715 return 0; 2716 } 2717 2718 static bool virtnet_commit_rss_command(struct virtnet_info *vi) 2719 { 2720 struct net_device *dev = vi->dev; 2721 struct scatterlist sgs[4]; 2722 unsigned int sg_buf_size; 2723 2724 /* prepare sgs */ 2725 sg_init_table(sgs, 4); 2726 2727 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, indirection_table); 2728 sg_set_buf(&sgs[0], &vi->ctrl->rss, sg_buf_size); 2729 2730 sg_buf_size = sizeof(uint16_t) * (vi->ctrl->rss.indirection_table_mask + 1); 2731 sg_set_buf(&sgs[1], vi->ctrl->rss.indirection_table, sg_buf_size); 2732 2733 sg_buf_size = offsetof(struct virtio_net_ctrl_rss, key) 2734 - offsetof(struct virtio_net_ctrl_rss, max_tx_vq); 2735 sg_set_buf(&sgs[2], &vi->ctrl->rss.max_tx_vq, sg_buf_size); 2736 2737 sg_buf_size = vi->rss_key_size; 2738 sg_set_buf(&sgs[3], vi->ctrl->rss.key, sg_buf_size); 2739 2740 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ, 2741 vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG 2742 : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) { 2743 dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n"); 2744 return false; 2745 } 2746 return true; 2747 } 2748 2749 static void virtnet_init_default_rss(struct virtnet_info *vi) 2750 { 2751 u32 indir_val = 0; 2752 int i = 0; 2753 2754 vi->ctrl->rss.hash_types = vi->rss_hash_types_supported; 2755 vi->rss_hash_types_saved = vi->rss_hash_types_supported; 2756 vi->ctrl->rss.indirection_table_mask = vi->rss_indir_table_size 2757 ? vi->rss_indir_table_size - 1 : 0; 2758 vi->ctrl->rss.unclassified_queue = 0; 2759 2760 for (; i < vi->rss_indir_table_size; ++i) { 2761 indir_val = ethtool_rxfh_indir_default(i, vi->curr_queue_pairs); 2762 vi->ctrl->rss.indirection_table[i] = indir_val; 2763 } 2764 2765 vi->ctrl->rss.max_tx_vq = vi->curr_queue_pairs; 2766 vi->ctrl->rss.hash_key_length = vi->rss_key_size; 2767 2768 netdev_rss_key_fill(vi->ctrl->rss.key, vi->rss_key_size); 2769 } 2770 2771 static void virtnet_get_hashflow(const struct virtnet_info *vi, struct ethtool_rxnfc *info) 2772 { 2773 info->data = 0; 2774 switch (info->flow_type) { 2775 case TCP_V4_FLOW: 2776 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv4) { 2777 info->data = RXH_IP_SRC | RXH_IP_DST | 2778 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2779 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2780 info->data = RXH_IP_SRC | RXH_IP_DST; 2781 } 2782 break; 2783 case TCP_V6_FLOW: 2784 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_TCPv6) { 2785 info->data = RXH_IP_SRC | RXH_IP_DST | 2786 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2787 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2788 info->data = RXH_IP_SRC | RXH_IP_DST; 2789 } 2790 break; 2791 case UDP_V4_FLOW: 2792 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv4) { 2793 info->data = RXH_IP_SRC | RXH_IP_DST | 2794 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2795 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) { 2796 info->data = RXH_IP_SRC | RXH_IP_DST; 2797 } 2798 break; 2799 case UDP_V6_FLOW: 2800 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_UDPv6) { 2801 info->data = RXH_IP_SRC | RXH_IP_DST | 2802 RXH_L4_B_0_1 | RXH_L4_B_2_3; 2803 } else if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) { 2804 info->data = RXH_IP_SRC | RXH_IP_DST; 2805 } 2806 break; 2807 case IPV4_FLOW: 2808 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv4) 2809 info->data = RXH_IP_SRC | RXH_IP_DST; 2810 2811 break; 2812 case IPV6_FLOW: 2813 if (vi->rss_hash_types_saved & VIRTIO_NET_RSS_HASH_TYPE_IPv6) 2814 info->data = RXH_IP_SRC | RXH_IP_DST; 2815 2816 break; 2817 default: 2818 info->data = 0; 2819 break; 2820 } 2821 } 2822 2823 static bool virtnet_set_hashflow(struct virtnet_info *vi, struct ethtool_rxnfc *info) 2824 { 2825 u32 new_hashtypes = vi->rss_hash_types_saved; 2826 bool is_disable = info->data & RXH_DISCARD; 2827 bool is_l4 = info->data == (RXH_IP_SRC | RXH_IP_DST | RXH_L4_B_0_1 | RXH_L4_B_2_3); 2828 2829 /* supports only 'sd', 'sdfn' and 'r' */ 2830 if (!((info->data == (RXH_IP_SRC | RXH_IP_DST)) | is_l4 | is_disable)) 2831 return false; 2832 2833 switch (info->flow_type) { 2834 case TCP_V4_FLOW: 2835 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_TCPv4); 2836 if (!is_disable) 2837 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2838 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv4 : 0); 2839 break; 2840 case UDP_V4_FLOW: 2841 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv4 | VIRTIO_NET_RSS_HASH_TYPE_UDPv4); 2842 if (!is_disable) 2843 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv4 2844 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv4 : 0); 2845 break; 2846 case IPV4_FLOW: 2847 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2848 if (!is_disable) 2849 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv4; 2850 break; 2851 case TCP_V6_FLOW: 2852 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_TCPv6); 2853 if (!is_disable) 2854 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2855 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_TCPv6 : 0); 2856 break; 2857 case UDP_V6_FLOW: 2858 new_hashtypes &= ~(VIRTIO_NET_RSS_HASH_TYPE_IPv6 | VIRTIO_NET_RSS_HASH_TYPE_UDPv6); 2859 if (!is_disable) 2860 new_hashtypes |= VIRTIO_NET_RSS_HASH_TYPE_IPv6 2861 | (is_l4 ? VIRTIO_NET_RSS_HASH_TYPE_UDPv6 : 0); 2862 break; 2863 case IPV6_FLOW: 2864 new_hashtypes &= ~VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2865 if (!is_disable) 2866 new_hashtypes = VIRTIO_NET_RSS_HASH_TYPE_IPv6; 2867 break; 2868 default: 2869 /* unsupported flow */ 2870 return false; 2871 } 2872 2873 /* if unsupported hashtype was set */ 2874 if (new_hashtypes != (new_hashtypes & vi->rss_hash_types_supported)) 2875 return false; 2876 2877 if (new_hashtypes != vi->rss_hash_types_saved) { 2878 vi->rss_hash_types_saved = new_hashtypes; 2879 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 2880 if (vi->dev->features & NETIF_F_RXHASH) 2881 return virtnet_commit_rss_command(vi); 2882 } 2883 2884 return true; 2885 } 2886 2887 static void virtnet_get_drvinfo(struct net_device *dev, 2888 struct ethtool_drvinfo *info) 2889 { 2890 struct virtnet_info *vi = netdev_priv(dev); 2891 struct virtio_device *vdev = vi->vdev; 2892 2893 strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver)); 2894 strscpy(info->version, VIRTNET_DRIVER_VERSION, sizeof(info->version)); 2895 strscpy(info->bus_info, virtio_bus_name(vdev), sizeof(info->bus_info)); 2896 2897 } 2898 2899 /* TODO: Eliminate OOO packets during switching */ 2900 static int virtnet_set_channels(struct net_device *dev, 2901 struct ethtool_channels *channels) 2902 { 2903 struct virtnet_info *vi = netdev_priv(dev); 2904 u16 queue_pairs = channels->combined_count; 2905 int err; 2906 2907 /* We don't support separate rx/tx channels. 2908 * We don't allow setting 'other' channels. 2909 */ 2910 if (channels->rx_count || channels->tx_count || channels->other_count) 2911 return -EINVAL; 2912 2913 if (queue_pairs > vi->max_queue_pairs || queue_pairs == 0) 2914 return -EINVAL; 2915 2916 /* For now we don't support modifying channels while XDP is loaded 2917 * also when XDP is loaded all RX queues have XDP programs so we only 2918 * need to check a single RX queue. 2919 */ 2920 if (vi->rq[0].xdp_prog) 2921 return -EINVAL; 2922 2923 cpus_read_lock(); 2924 err = _virtnet_set_queues(vi, queue_pairs); 2925 if (err) { 2926 cpus_read_unlock(); 2927 goto err; 2928 } 2929 virtnet_set_affinity(vi); 2930 cpus_read_unlock(); 2931 2932 netif_set_real_num_tx_queues(dev, queue_pairs); 2933 netif_set_real_num_rx_queues(dev, queue_pairs); 2934 err: 2935 return err; 2936 } 2937 2938 static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data) 2939 { 2940 struct virtnet_info *vi = netdev_priv(dev); 2941 unsigned int i, j; 2942 u8 *p = data; 2943 2944 switch (stringset) { 2945 case ETH_SS_STATS: 2946 for (i = 0; i < vi->curr_queue_pairs; i++) { 2947 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) 2948 ethtool_sprintf(&p, "rx_queue_%u_%s", i, 2949 virtnet_rq_stats_desc[j].desc); 2950 } 2951 2952 for (i = 0; i < vi->curr_queue_pairs; i++) { 2953 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) 2954 ethtool_sprintf(&p, "tx_queue_%u_%s", i, 2955 virtnet_sq_stats_desc[j].desc); 2956 } 2957 break; 2958 } 2959 } 2960 2961 static int virtnet_get_sset_count(struct net_device *dev, int sset) 2962 { 2963 struct virtnet_info *vi = netdev_priv(dev); 2964 2965 switch (sset) { 2966 case ETH_SS_STATS: 2967 return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN + 2968 VIRTNET_SQ_STATS_LEN); 2969 default: 2970 return -EOPNOTSUPP; 2971 } 2972 } 2973 2974 static void virtnet_get_ethtool_stats(struct net_device *dev, 2975 struct ethtool_stats *stats, u64 *data) 2976 { 2977 struct virtnet_info *vi = netdev_priv(dev); 2978 unsigned int idx = 0, start, i, j; 2979 const u8 *stats_base; 2980 size_t offset; 2981 2982 for (i = 0; i < vi->curr_queue_pairs; i++) { 2983 struct receive_queue *rq = &vi->rq[i]; 2984 2985 stats_base = (u8 *)&rq->stats; 2986 do { 2987 start = u64_stats_fetch_begin(&rq->stats.syncp); 2988 for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++) { 2989 offset = virtnet_rq_stats_desc[j].offset; 2990 data[idx + j] = *(u64 *)(stats_base + offset); 2991 } 2992 } while (u64_stats_fetch_retry(&rq->stats.syncp, start)); 2993 idx += VIRTNET_RQ_STATS_LEN; 2994 } 2995 2996 for (i = 0; i < vi->curr_queue_pairs; i++) { 2997 struct send_queue *sq = &vi->sq[i]; 2998 2999 stats_base = (u8 *)&sq->stats; 3000 do { 3001 start = u64_stats_fetch_begin(&sq->stats.syncp); 3002 for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++) { 3003 offset = virtnet_sq_stats_desc[j].offset; 3004 data[idx + j] = *(u64 *)(stats_base + offset); 3005 } 3006 } while (u64_stats_fetch_retry(&sq->stats.syncp, start)); 3007 idx += VIRTNET_SQ_STATS_LEN; 3008 } 3009 } 3010 3011 static void virtnet_get_channels(struct net_device *dev, 3012 struct ethtool_channels *channels) 3013 { 3014 struct virtnet_info *vi = netdev_priv(dev); 3015 3016 channels->combined_count = vi->curr_queue_pairs; 3017 channels->max_combined = vi->max_queue_pairs; 3018 channels->max_other = 0; 3019 channels->rx_count = 0; 3020 channels->tx_count = 0; 3021 channels->other_count = 0; 3022 } 3023 3024 static int virtnet_set_link_ksettings(struct net_device *dev, 3025 const struct ethtool_link_ksettings *cmd) 3026 { 3027 struct virtnet_info *vi = netdev_priv(dev); 3028 3029 return ethtool_virtdev_set_link_ksettings(dev, cmd, 3030 &vi->speed, &vi->duplex); 3031 } 3032 3033 static int virtnet_get_link_ksettings(struct net_device *dev, 3034 struct ethtool_link_ksettings *cmd) 3035 { 3036 struct virtnet_info *vi = netdev_priv(dev); 3037 3038 cmd->base.speed = vi->speed; 3039 cmd->base.duplex = vi->duplex; 3040 cmd->base.port = PORT_OTHER; 3041 3042 return 0; 3043 } 3044 3045 static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi, 3046 struct ethtool_coalesce *ec) 3047 { 3048 struct scatterlist sgs_tx, sgs_rx; 3049 3050 vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs); 3051 vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames); 3052 sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx)); 3053 3054 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 3055 VIRTIO_NET_CTRL_NOTF_COAL_TX_SET, 3056 &sgs_tx)) 3057 return -EINVAL; 3058 3059 /* Save parameters */ 3060 vi->tx_usecs = ec->tx_coalesce_usecs; 3061 vi->tx_max_packets = ec->tx_max_coalesced_frames; 3062 3063 vi->ctrl->coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs); 3064 vi->ctrl->coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames); 3065 sg_init_one(&sgs_rx, &vi->ctrl->coal_rx, sizeof(vi->ctrl->coal_rx)); 3066 3067 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL, 3068 VIRTIO_NET_CTRL_NOTF_COAL_RX_SET, 3069 &sgs_rx)) 3070 return -EINVAL; 3071 3072 /* Save parameters */ 3073 vi->rx_usecs = ec->rx_coalesce_usecs; 3074 vi->rx_max_packets = ec->rx_max_coalesced_frames; 3075 3076 return 0; 3077 } 3078 3079 static int virtnet_coal_params_supported(struct ethtool_coalesce *ec) 3080 { 3081 /* usecs coalescing is supported only if VIRTIO_NET_F_NOTF_COAL 3082 * feature is negotiated. 3083 */ 3084 if (ec->rx_coalesce_usecs || ec->tx_coalesce_usecs) 3085 return -EOPNOTSUPP; 3086 3087 if (ec->tx_max_coalesced_frames > 1 || 3088 ec->rx_max_coalesced_frames != 1) 3089 return -EINVAL; 3090 3091 return 0; 3092 } 3093 3094 static int virtnet_set_coalesce(struct net_device *dev, 3095 struct ethtool_coalesce *ec, 3096 struct kernel_ethtool_coalesce *kernel_coal, 3097 struct netlink_ext_ack *extack) 3098 { 3099 struct virtnet_info *vi = netdev_priv(dev); 3100 int ret, i, napi_weight; 3101 bool update_napi = false; 3102 3103 /* Can't change NAPI weight if the link is up */ 3104 napi_weight = ec->tx_max_coalesced_frames ? NAPI_POLL_WEIGHT : 0; 3105 if (napi_weight ^ vi->sq[0].napi.weight) { 3106 if (dev->flags & IFF_UP) 3107 return -EBUSY; 3108 else 3109 update_napi = true; 3110 } 3111 3112 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) 3113 ret = virtnet_send_notf_coal_cmds(vi, ec); 3114 else 3115 ret = virtnet_coal_params_supported(ec); 3116 3117 if (ret) 3118 return ret; 3119 3120 if (update_napi) { 3121 for (i = 0; i < vi->max_queue_pairs; i++) 3122 vi->sq[i].napi.weight = napi_weight; 3123 } 3124 3125 return ret; 3126 } 3127 3128 static int virtnet_get_coalesce(struct net_device *dev, 3129 struct ethtool_coalesce *ec, 3130 struct kernel_ethtool_coalesce *kernel_coal, 3131 struct netlink_ext_ack *extack) 3132 { 3133 struct virtnet_info *vi = netdev_priv(dev); 3134 3135 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 3136 ec->rx_coalesce_usecs = vi->rx_usecs; 3137 ec->tx_coalesce_usecs = vi->tx_usecs; 3138 ec->tx_max_coalesced_frames = vi->tx_max_packets; 3139 ec->rx_max_coalesced_frames = vi->rx_max_packets; 3140 } else { 3141 ec->rx_max_coalesced_frames = 1; 3142 3143 if (vi->sq[0].napi.weight) 3144 ec->tx_max_coalesced_frames = 1; 3145 } 3146 3147 return 0; 3148 } 3149 3150 static void virtnet_init_settings(struct net_device *dev) 3151 { 3152 struct virtnet_info *vi = netdev_priv(dev); 3153 3154 vi->speed = SPEED_UNKNOWN; 3155 vi->duplex = DUPLEX_UNKNOWN; 3156 } 3157 3158 static void virtnet_update_settings(struct virtnet_info *vi) 3159 { 3160 u32 speed; 3161 u8 duplex; 3162 3163 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_SPEED_DUPLEX)) 3164 return; 3165 3166 virtio_cread_le(vi->vdev, struct virtio_net_config, speed, &speed); 3167 3168 if (ethtool_validate_speed(speed)) 3169 vi->speed = speed; 3170 3171 virtio_cread_le(vi->vdev, struct virtio_net_config, duplex, &duplex); 3172 3173 if (ethtool_validate_duplex(duplex)) 3174 vi->duplex = duplex; 3175 } 3176 3177 static u32 virtnet_get_rxfh_key_size(struct net_device *dev) 3178 { 3179 return ((struct virtnet_info *)netdev_priv(dev))->rss_key_size; 3180 } 3181 3182 static u32 virtnet_get_rxfh_indir_size(struct net_device *dev) 3183 { 3184 return ((struct virtnet_info *)netdev_priv(dev))->rss_indir_table_size; 3185 } 3186 3187 static int virtnet_get_rxfh(struct net_device *dev, u32 *indir, u8 *key, u8 *hfunc) 3188 { 3189 struct virtnet_info *vi = netdev_priv(dev); 3190 int i; 3191 3192 if (indir) { 3193 for (i = 0; i < vi->rss_indir_table_size; ++i) 3194 indir[i] = vi->ctrl->rss.indirection_table[i]; 3195 } 3196 3197 if (key) 3198 memcpy(key, vi->ctrl->rss.key, vi->rss_key_size); 3199 3200 if (hfunc) 3201 *hfunc = ETH_RSS_HASH_TOP; 3202 3203 return 0; 3204 } 3205 3206 static int virtnet_set_rxfh(struct net_device *dev, const u32 *indir, const u8 *key, const u8 hfunc) 3207 { 3208 struct virtnet_info *vi = netdev_priv(dev); 3209 int i; 3210 3211 if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) 3212 return -EOPNOTSUPP; 3213 3214 if (indir) { 3215 for (i = 0; i < vi->rss_indir_table_size; ++i) 3216 vi->ctrl->rss.indirection_table[i] = indir[i]; 3217 } 3218 if (key) 3219 memcpy(vi->ctrl->rss.key, key, vi->rss_key_size); 3220 3221 virtnet_commit_rss_command(vi); 3222 3223 return 0; 3224 } 3225 3226 static int virtnet_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info, u32 *rule_locs) 3227 { 3228 struct virtnet_info *vi = netdev_priv(dev); 3229 int rc = 0; 3230 3231 switch (info->cmd) { 3232 case ETHTOOL_GRXRINGS: 3233 info->data = vi->curr_queue_pairs; 3234 break; 3235 case ETHTOOL_GRXFH: 3236 virtnet_get_hashflow(vi, info); 3237 break; 3238 default: 3239 rc = -EOPNOTSUPP; 3240 } 3241 3242 return rc; 3243 } 3244 3245 static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info) 3246 { 3247 struct virtnet_info *vi = netdev_priv(dev); 3248 int rc = 0; 3249 3250 switch (info->cmd) { 3251 case ETHTOOL_SRXFH: 3252 if (!virtnet_set_hashflow(vi, info)) 3253 rc = -EINVAL; 3254 3255 break; 3256 default: 3257 rc = -EOPNOTSUPP; 3258 } 3259 3260 return rc; 3261 } 3262 3263 static const struct ethtool_ops virtnet_ethtool_ops = { 3264 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES | 3265 ETHTOOL_COALESCE_USECS, 3266 .get_drvinfo = virtnet_get_drvinfo, 3267 .get_link = ethtool_op_get_link, 3268 .get_ringparam = virtnet_get_ringparam, 3269 .set_ringparam = virtnet_set_ringparam, 3270 .get_strings = virtnet_get_strings, 3271 .get_sset_count = virtnet_get_sset_count, 3272 .get_ethtool_stats = virtnet_get_ethtool_stats, 3273 .set_channels = virtnet_set_channels, 3274 .get_channels = virtnet_get_channels, 3275 .get_ts_info = ethtool_op_get_ts_info, 3276 .get_link_ksettings = virtnet_get_link_ksettings, 3277 .set_link_ksettings = virtnet_set_link_ksettings, 3278 .set_coalesce = virtnet_set_coalesce, 3279 .get_coalesce = virtnet_get_coalesce, 3280 .get_rxfh_key_size = virtnet_get_rxfh_key_size, 3281 .get_rxfh_indir_size = virtnet_get_rxfh_indir_size, 3282 .get_rxfh = virtnet_get_rxfh, 3283 .set_rxfh = virtnet_set_rxfh, 3284 .get_rxnfc = virtnet_get_rxnfc, 3285 .set_rxnfc = virtnet_set_rxnfc, 3286 }; 3287 3288 static void virtnet_freeze_down(struct virtio_device *vdev) 3289 { 3290 struct virtnet_info *vi = vdev->priv; 3291 3292 /* Make sure no work handler is accessing the device */ 3293 flush_work(&vi->config_work); 3294 3295 netif_tx_lock_bh(vi->dev); 3296 netif_device_detach(vi->dev); 3297 netif_tx_unlock_bh(vi->dev); 3298 if (netif_running(vi->dev)) 3299 virtnet_close(vi->dev); 3300 } 3301 3302 static int init_vqs(struct virtnet_info *vi); 3303 3304 static int virtnet_restore_up(struct virtio_device *vdev) 3305 { 3306 struct virtnet_info *vi = vdev->priv; 3307 int err; 3308 3309 err = init_vqs(vi); 3310 if (err) 3311 return err; 3312 3313 virtio_device_ready(vdev); 3314 3315 enable_delayed_refill(vi); 3316 3317 if (netif_running(vi->dev)) { 3318 err = virtnet_open(vi->dev); 3319 if (err) 3320 return err; 3321 } 3322 3323 netif_tx_lock_bh(vi->dev); 3324 netif_device_attach(vi->dev); 3325 netif_tx_unlock_bh(vi->dev); 3326 return err; 3327 } 3328 3329 static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads) 3330 { 3331 struct scatterlist sg; 3332 vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads); 3333 3334 sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads)); 3335 3336 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 3337 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) { 3338 dev_warn(&vi->dev->dev, "Fail to set guest offload.\n"); 3339 return -EINVAL; 3340 } 3341 3342 return 0; 3343 } 3344 3345 static int virtnet_clear_guest_offloads(struct virtnet_info *vi) 3346 { 3347 u64 offloads = 0; 3348 3349 if (!vi->guest_offloads) 3350 return 0; 3351 3352 return virtnet_set_guest_offloads(vi, offloads); 3353 } 3354 3355 static int virtnet_restore_guest_offloads(struct virtnet_info *vi) 3356 { 3357 u64 offloads = vi->guest_offloads; 3358 3359 if (!vi->guest_offloads) 3360 return 0; 3361 3362 return virtnet_set_guest_offloads(vi, offloads); 3363 } 3364 3365 static int virtnet_xdp_set(struct net_device *dev, struct bpf_prog *prog, 3366 struct netlink_ext_ack *extack) 3367 { 3368 unsigned int room = SKB_DATA_ALIGN(VIRTIO_XDP_HEADROOM + 3369 sizeof(struct skb_shared_info)); 3370 unsigned int max_sz = PAGE_SIZE - room - ETH_HLEN; 3371 struct virtnet_info *vi = netdev_priv(dev); 3372 struct bpf_prog *old_prog; 3373 u16 xdp_qp = 0, curr_qp; 3374 int i, err; 3375 3376 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) 3377 && (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3378 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3379 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3380 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 3381 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_CSUM) || 3382 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) || 3383 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6))) { 3384 NL_SET_ERR_MSG_MOD(extack, "Can't set XDP while host is implementing GRO_HW/CSUM, disable GRO_HW/CSUM first"); 3385 return -EOPNOTSUPP; 3386 } 3387 3388 if (vi->mergeable_rx_bufs && !vi->any_header_sg) { 3389 NL_SET_ERR_MSG_MOD(extack, "XDP expects header/data in single page, any_header_sg required"); 3390 return -EINVAL; 3391 } 3392 3393 if (prog && !prog->aux->xdp_has_frags && dev->mtu > max_sz) { 3394 NL_SET_ERR_MSG_MOD(extack, "MTU too large to enable XDP without frags"); 3395 netdev_warn(dev, "single-buffer XDP requires MTU less than %u\n", max_sz); 3396 return -EINVAL; 3397 } 3398 3399 curr_qp = vi->curr_queue_pairs - vi->xdp_queue_pairs; 3400 if (prog) 3401 xdp_qp = nr_cpu_ids; 3402 3403 /* XDP requires extra queues for XDP_TX */ 3404 if (curr_qp + xdp_qp > vi->max_queue_pairs) { 3405 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", 3406 curr_qp + xdp_qp, vi->max_queue_pairs); 3407 xdp_qp = 0; 3408 } 3409 3410 old_prog = rtnl_dereference(vi->rq[0].xdp_prog); 3411 if (!prog && !old_prog) 3412 return 0; 3413 3414 if (prog) 3415 bpf_prog_add(prog, vi->max_queue_pairs - 1); 3416 3417 /* Make sure NAPI is not using any XDP TX queues for RX. */ 3418 if (netif_running(dev)) { 3419 for (i = 0; i < vi->max_queue_pairs; i++) { 3420 napi_disable(&vi->rq[i].napi); 3421 virtnet_napi_tx_disable(&vi->sq[i].napi); 3422 } 3423 } 3424 3425 if (!prog) { 3426 for (i = 0; i < vi->max_queue_pairs; i++) { 3427 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3428 if (i == 0) 3429 virtnet_restore_guest_offloads(vi); 3430 } 3431 synchronize_net(); 3432 } 3433 3434 err = _virtnet_set_queues(vi, curr_qp + xdp_qp); 3435 if (err) 3436 goto err; 3437 netif_set_real_num_rx_queues(dev, curr_qp + xdp_qp); 3438 vi->xdp_queue_pairs = xdp_qp; 3439 3440 if (prog) { 3441 vi->xdp_enabled = true; 3442 for (i = 0; i < vi->max_queue_pairs; i++) { 3443 rcu_assign_pointer(vi->rq[i].xdp_prog, prog); 3444 if (i == 0 && !old_prog) 3445 virtnet_clear_guest_offloads(vi); 3446 } 3447 if (!old_prog) 3448 xdp_features_set_redirect_target(dev, true); 3449 } else { 3450 xdp_features_clear_redirect_target(dev); 3451 vi->xdp_enabled = false; 3452 } 3453 3454 for (i = 0; i < vi->max_queue_pairs; i++) { 3455 if (old_prog) 3456 bpf_prog_put(old_prog); 3457 if (netif_running(dev)) { 3458 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3459 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3460 &vi->sq[i].napi); 3461 } 3462 } 3463 3464 return 0; 3465 3466 err: 3467 if (!prog) { 3468 virtnet_clear_guest_offloads(vi); 3469 for (i = 0; i < vi->max_queue_pairs; i++) 3470 rcu_assign_pointer(vi->rq[i].xdp_prog, old_prog); 3471 } 3472 3473 if (netif_running(dev)) { 3474 for (i = 0; i < vi->max_queue_pairs; i++) { 3475 virtnet_napi_enable(vi->rq[i].vq, &vi->rq[i].napi); 3476 virtnet_napi_tx_enable(vi, vi->sq[i].vq, 3477 &vi->sq[i].napi); 3478 } 3479 } 3480 if (prog) 3481 bpf_prog_sub(prog, vi->max_queue_pairs - 1); 3482 return err; 3483 } 3484 3485 static int virtnet_xdp(struct net_device *dev, struct netdev_bpf *xdp) 3486 { 3487 switch (xdp->command) { 3488 case XDP_SETUP_PROG: 3489 return virtnet_xdp_set(dev, xdp->prog, xdp->extack); 3490 default: 3491 return -EINVAL; 3492 } 3493 } 3494 3495 static int virtnet_get_phys_port_name(struct net_device *dev, char *buf, 3496 size_t len) 3497 { 3498 struct virtnet_info *vi = netdev_priv(dev); 3499 int ret; 3500 3501 if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_STANDBY)) 3502 return -EOPNOTSUPP; 3503 3504 ret = snprintf(buf, len, "sby"); 3505 if (ret >= len) 3506 return -EOPNOTSUPP; 3507 3508 return 0; 3509 } 3510 3511 static int virtnet_set_features(struct net_device *dev, 3512 netdev_features_t features) 3513 { 3514 struct virtnet_info *vi = netdev_priv(dev); 3515 u64 offloads; 3516 int err; 3517 3518 if ((dev->features ^ features) & NETIF_F_GRO_HW) { 3519 if (vi->xdp_enabled) 3520 return -EBUSY; 3521 3522 if (features & NETIF_F_GRO_HW) 3523 offloads = vi->guest_offloads_capable; 3524 else 3525 offloads = vi->guest_offloads_capable & 3526 ~GUEST_OFFLOAD_GRO_HW_MASK; 3527 3528 err = virtnet_set_guest_offloads(vi, offloads); 3529 if (err) 3530 return err; 3531 vi->guest_offloads = offloads; 3532 } 3533 3534 if ((dev->features ^ features) & NETIF_F_RXHASH) { 3535 if (features & NETIF_F_RXHASH) 3536 vi->ctrl->rss.hash_types = vi->rss_hash_types_saved; 3537 else 3538 vi->ctrl->rss.hash_types = VIRTIO_NET_HASH_REPORT_NONE; 3539 3540 if (!virtnet_commit_rss_command(vi)) 3541 return -EINVAL; 3542 } 3543 3544 return 0; 3545 } 3546 3547 static void virtnet_tx_timeout(struct net_device *dev, unsigned int txqueue) 3548 { 3549 struct virtnet_info *priv = netdev_priv(dev); 3550 struct send_queue *sq = &priv->sq[txqueue]; 3551 struct netdev_queue *txq = netdev_get_tx_queue(dev, txqueue); 3552 3553 u64_stats_update_begin(&sq->stats.syncp); 3554 sq->stats.tx_timeouts++; 3555 u64_stats_update_end(&sq->stats.syncp); 3556 3557 netdev_err(dev, "TX timeout on queue: %u, sq: %s, vq: 0x%x, name: %s, %u usecs ago\n", 3558 txqueue, sq->name, sq->vq->index, sq->vq->name, 3559 jiffies_to_usecs(jiffies - READ_ONCE(txq->trans_start))); 3560 } 3561 3562 static const struct net_device_ops virtnet_netdev = { 3563 .ndo_open = virtnet_open, 3564 .ndo_stop = virtnet_close, 3565 .ndo_start_xmit = start_xmit, 3566 .ndo_validate_addr = eth_validate_addr, 3567 .ndo_set_mac_address = virtnet_set_mac_address, 3568 .ndo_set_rx_mode = virtnet_set_rx_mode, 3569 .ndo_get_stats64 = virtnet_stats, 3570 .ndo_vlan_rx_add_vid = virtnet_vlan_rx_add_vid, 3571 .ndo_vlan_rx_kill_vid = virtnet_vlan_rx_kill_vid, 3572 .ndo_bpf = virtnet_xdp, 3573 .ndo_xdp_xmit = virtnet_xdp_xmit, 3574 .ndo_features_check = passthru_features_check, 3575 .ndo_get_phys_port_name = virtnet_get_phys_port_name, 3576 .ndo_set_features = virtnet_set_features, 3577 .ndo_tx_timeout = virtnet_tx_timeout, 3578 }; 3579 3580 static void virtnet_config_changed_work(struct work_struct *work) 3581 { 3582 struct virtnet_info *vi = 3583 container_of(work, struct virtnet_info, config_work); 3584 u16 v; 3585 3586 if (virtio_cread_feature(vi->vdev, VIRTIO_NET_F_STATUS, 3587 struct virtio_net_config, status, &v) < 0) 3588 return; 3589 3590 if (v & VIRTIO_NET_S_ANNOUNCE) { 3591 netdev_notify_peers(vi->dev); 3592 virtnet_ack_link_announce(vi); 3593 } 3594 3595 /* Ignore unknown (future) status bits */ 3596 v &= VIRTIO_NET_S_LINK_UP; 3597 3598 if (vi->status == v) 3599 return; 3600 3601 vi->status = v; 3602 3603 if (vi->status & VIRTIO_NET_S_LINK_UP) { 3604 virtnet_update_settings(vi); 3605 netif_carrier_on(vi->dev); 3606 netif_tx_wake_all_queues(vi->dev); 3607 } else { 3608 netif_carrier_off(vi->dev); 3609 netif_tx_stop_all_queues(vi->dev); 3610 } 3611 } 3612 3613 static void virtnet_config_changed(struct virtio_device *vdev) 3614 { 3615 struct virtnet_info *vi = vdev->priv; 3616 3617 schedule_work(&vi->config_work); 3618 } 3619 3620 static void virtnet_free_queues(struct virtnet_info *vi) 3621 { 3622 int i; 3623 3624 for (i = 0; i < vi->max_queue_pairs; i++) { 3625 __netif_napi_del(&vi->rq[i].napi); 3626 __netif_napi_del(&vi->sq[i].napi); 3627 } 3628 3629 /* We called __netif_napi_del(), 3630 * we need to respect an RCU grace period before freeing vi->rq 3631 */ 3632 synchronize_net(); 3633 3634 kfree(vi->rq); 3635 kfree(vi->sq); 3636 kfree(vi->ctrl); 3637 } 3638 3639 static void _free_receive_bufs(struct virtnet_info *vi) 3640 { 3641 struct bpf_prog *old_prog; 3642 int i; 3643 3644 for (i = 0; i < vi->max_queue_pairs; i++) { 3645 while (vi->rq[i].pages) 3646 __free_pages(get_a_page(&vi->rq[i], GFP_KERNEL), 0); 3647 3648 old_prog = rtnl_dereference(vi->rq[i].xdp_prog); 3649 RCU_INIT_POINTER(vi->rq[i].xdp_prog, NULL); 3650 if (old_prog) 3651 bpf_prog_put(old_prog); 3652 } 3653 } 3654 3655 static void free_receive_bufs(struct virtnet_info *vi) 3656 { 3657 rtnl_lock(); 3658 _free_receive_bufs(vi); 3659 rtnl_unlock(); 3660 } 3661 3662 static void free_receive_page_frags(struct virtnet_info *vi) 3663 { 3664 int i; 3665 for (i = 0; i < vi->max_queue_pairs; i++) 3666 if (vi->rq[i].alloc_frag.page) 3667 put_page(vi->rq[i].alloc_frag.page); 3668 } 3669 3670 static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf) 3671 { 3672 if (!is_xdp_frame(buf)) 3673 dev_kfree_skb(buf); 3674 else 3675 xdp_return_frame(ptr_to_xdp(buf)); 3676 } 3677 3678 static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf) 3679 { 3680 struct virtnet_info *vi = vq->vdev->priv; 3681 int i = vq2rxq(vq); 3682 3683 if (vi->mergeable_rx_bufs) 3684 put_page(virt_to_head_page(buf)); 3685 else if (vi->big_packets) 3686 give_pages(&vi->rq[i], buf); 3687 else 3688 put_page(virt_to_head_page(buf)); 3689 } 3690 3691 static void free_unused_bufs(struct virtnet_info *vi) 3692 { 3693 void *buf; 3694 int i; 3695 3696 for (i = 0; i < vi->max_queue_pairs; i++) { 3697 struct virtqueue *vq = vi->sq[i].vq; 3698 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3699 virtnet_sq_free_unused_buf(vq, buf); 3700 cond_resched(); 3701 } 3702 3703 for (i = 0; i < vi->max_queue_pairs; i++) { 3704 struct virtqueue *vq = vi->rq[i].vq; 3705 while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) 3706 virtnet_rq_free_unused_buf(vq, buf); 3707 cond_resched(); 3708 } 3709 } 3710 3711 static void virtnet_del_vqs(struct virtnet_info *vi) 3712 { 3713 struct virtio_device *vdev = vi->vdev; 3714 3715 virtnet_clean_affinity(vi); 3716 3717 vdev->config->del_vqs(vdev); 3718 3719 virtnet_free_queues(vi); 3720 } 3721 3722 /* How large should a single buffer be so a queue full of these can fit at 3723 * least one full packet? 3724 * Logic below assumes the mergeable buffer header is used. 3725 */ 3726 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq) 3727 { 3728 const unsigned int hdr_len = vi->hdr_len; 3729 unsigned int rq_size = virtqueue_get_vring_size(vq); 3730 unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu; 3731 unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len; 3732 unsigned int min_buf_len = DIV_ROUND_UP(buf_len, rq_size); 3733 3734 return max(max(min_buf_len, hdr_len) - hdr_len, 3735 (unsigned int)GOOD_PACKET_LEN); 3736 } 3737 3738 static int virtnet_find_vqs(struct virtnet_info *vi) 3739 { 3740 vq_callback_t **callbacks; 3741 struct virtqueue **vqs; 3742 int ret = -ENOMEM; 3743 int i, total_vqs; 3744 const char **names; 3745 bool *ctx; 3746 3747 /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by 3748 * possible N-1 RX/TX queue pairs used in multiqueue mode, followed by 3749 * possible control vq. 3750 */ 3751 total_vqs = vi->max_queue_pairs * 2 + 3752 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ); 3753 3754 /* Allocate space for find_vqs parameters */ 3755 vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL); 3756 if (!vqs) 3757 goto err_vq; 3758 callbacks = kmalloc_array(total_vqs, sizeof(*callbacks), GFP_KERNEL); 3759 if (!callbacks) 3760 goto err_callback; 3761 names = kmalloc_array(total_vqs, sizeof(*names), GFP_KERNEL); 3762 if (!names) 3763 goto err_names; 3764 if (!vi->big_packets || vi->mergeable_rx_bufs) { 3765 ctx = kcalloc(total_vqs, sizeof(*ctx), GFP_KERNEL); 3766 if (!ctx) 3767 goto err_ctx; 3768 } else { 3769 ctx = NULL; 3770 } 3771 3772 /* Parameters for control virtqueue, if any */ 3773 if (vi->has_cvq) { 3774 callbacks[total_vqs - 1] = NULL; 3775 names[total_vqs - 1] = "control"; 3776 } 3777 3778 /* Allocate/initialize parameters for send/receive virtqueues */ 3779 for (i = 0; i < vi->max_queue_pairs; i++) { 3780 callbacks[rxq2vq(i)] = skb_recv_done; 3781 callbacks[txq2vq(i)] = skb_xmit_done; 3782 sprintf(vi->rq[i].name, "input.%d", i); 3783 sprintf(vi->sq[i].name, "output.%d", i); 3784 names[rxq2vq(i)] = vi->rq[i].name; 3785 names[txq2vq(i)] = vi->sq[i].name; 3786 if (ctx) 3787 ctx[rxq2vq(i)] = true; 3788 } 3789 3790 ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, 3791 names, ctx, NULL); 3792 if (ret) 3793 goto err_find; 3794 3795 if (vi->has_cvq) { 3796 vi->cvq = vqs[total_vqs - 1]; 3797 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN)) 3798 vi->dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 3799 } 3800 3801 for (i = 0; i < vi->max_queue_pairs; i++) { 3802 vi->rq[i].vq = vqs[rxq2vq(i)]; 3803 vi->rq[i].min_buf_len = mergeable_min_buf_len(vi, vi->rq[i].vq); 3804 vi->sq[i].vq = vqs[txq2vq(i)]; 3805 } 3806 3807 /* run here: ret == 0. */ 3808 3809 3810 err_find: 3811 kfree(ctx); 3812 err_ctx: 3813 kfree(names); 3814 err_names: 3815 kfree(callbacks); 3816 err_callback: 3817 kfree(vqs); 3818 err_vq: 3819 return ret; 3820 } 3821 3822 static int virtnet_alloc_queues(struct virtnet_info *vi) 3823 { 3824 int i; 3825 3826 if (vi->has_cvq) { 3827 vi->ctrl = kzalloc(sizeof(*vi->ctrl), GFP_KERNEL); 3828 if (!vi->ctrl) 3829 goto err_ctrl; 3830 } else { 3831 vi->ctrl = NULL; 3832 } 3833 vi->sq = kcalloc(vi->max_queue_pairs, sizeof(*vi->sq), GFP_KERNEL); 3834 if (!vi->sq) 3835 goto err_sq; 3836 vi->rq = kcalloc(vi->max_queue_pairs, sizeof(*vi->rq), GFP_KERNEL); 3837 if (!vi->rq) 3838 goto err_rq; 3839 3840 INIT_DELAYED_WORK(&vi->refill, refill_work); 3841 for (i = 0; i < vi->max_queue_pairs; i++) { 3842 vi->rq[i].pages = NULL; 3843 netif_napi_add_weight(vi->dev, &vi->rq[i].napi, virtnet_poll, 3844 napi_weight); 3845 netif_napi_add_tx_weight(vi->dev, &vi->sq[i].napi, 3846 virtnet_poll_tx, 3847 napi_tx ? napi_weight : 0); 3848 3849 sg_init_table(vi->rq[i].sg, ARRAY_SIZE(vi->rq[i].sg)); 3850 ewma_pkt_len_init(&vi->rq[i].mrg_avg_pkt_len); 3851 sg_init_table(vi->sq[i].sg, ARRAY_SIZE(vi->sq[i].sg)); 3852 3853 u64_stats_init(&vi->rq[i].stats.syncp); 3854 u64_stats_init(&vi->sq[i].stats.syncp); 3855 } 3856 3857 return 0; 3858 3859 err_rq: 3860 kfree(vi->sq); 3861 err_sq: 3862 kfree(vi->ctrl); 3863 err_ctrl: 3864 return -ENOMEM; 3865 } 3866 3867 static int init_vqs(struct virtnet_info *vi) 3868 { 3869 int ret; 3870 3871 /* Allocate send & receive queues */ 3872 ret = virtnet_alloc_queues(vi); 3873 if (ret) 3874 goto err; 3875 3876 ret = virtnet_find_vqs(vi); 3877 if (ret) 3878 goto err_free; 3879 3880 cpus_read_lock(); 3881 virtnet_set_affinity(vi); 3882 cpus_read_unlock(); 3883 3884 return 0; 3885 3886 err_free: 3887 virtnet_free_queues(vi); 3888 err: 3889 return ret; 3890 } 3891 3892 #ifdef CONFIG_SYSFS 3893 static ssize_t mergeable_rx_buffer_size_show(struct netdev_rx_queue *queue, 3894 char *buf) 3895 { 3896 struct virtnet_info *vi = netdev_priv(queue->dev); 3897 unsigned int queue_index = get_netdev_rx_queue_index(queue); 3898 unsigned int headroom = virtnet_get_headroom(vi); 3899 unsigned int tailroom = headroom ? sizeof(struct skb_shared_info) : 0; 3900 struct ewma_pkt_len *avg; 3901 3902 BUG_ON(queue_index >= vi->max_queue_pairs); 3903 avg = &vi->rq[queue_index].mrg_avg_pkt_len; 3904 return sprintf(buf, "%u\n", 3905 get_mergeable_buf_len(&vi->rq[queue_index], avg, 3906 SKB_DATA_ALIGN(headroom + tailroom))); 3907 } 3908 3909 static struct rx_queue_attribute mergeable_rx_buffer_size_attribute = 3910 __ATTR_RO(mergeable_rx_buffer_size); 3911 3912 static struct attribute *virtio_net_mrg_rx_attrs[] = { 3913 &mergeable_rx_buffer_size_attribute.attr, 3914 NULL 3915 }; 3916 3917 static const struct attribute_group virtio_net_mrg_rx_group = { 3918 .name = "virtio_net", 3919 .attrs = virtio_net_mrg_rx_attrs 3920 }; 3921 #endif 3922 3923 static bool virtnet_fail_on_feature(struct virtio_device *vdev, 3924 unsigned int fbit, 3925 const char *fname, const char *dname) 3926 { 3927 if (!virtio_has_feature(vdev, fbit)) 3928 return false; 3929 3930 dev_err(&vdev->dev, "device advertises feature %s but not %s", 3931 fname, dname); 3932 3933 return true; 3934 } 3935 3936 #define VIRTNET_FAIL_ON(vdev, fbit, dbit) \ 3937 virtnet_fail_on_feature(vdev, fbit, #fbit, dbit) 3938 3939 static bool virtnet_validate_features(struct virtio_device *vdev) 3940 { 3941 if (!virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) && 3942 (VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_RX, 3943 "VIRTIO_NET_F_CTRL_VQ") || 3944 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_VLAN, 3945 "VIRTIO_NET_F_CTRL_VQ") || 3946 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_GUEST_ANNOUNCE, 3947 "VIRTIO_NET_F_CTRL_VQ") || 3948 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_MQ, "VIRTIO_NET_F_CTRL_VQ") || 3949 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_CTRL_MAC_ADDR, 3950 "VIRTIO_NET_F_CTRL_VQ") || 3951 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_RSS, 3952 "VIRTIO_NET_F_CTRL_VQ") || 3953 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_HASH_REPORT, 3954 "VIRTIO_NET_F_CTRL_VQ") || 3955 VIRTNET_FAIL_ON(vdev, VIRTIO_NET_F_NOTF_COAL, 3956 "VIRTIO_NET_F_CTRL_VQ"))) { 3957 return false; 3958 } 3959 3960 return true; 3961 } 3962 3963 #define MIN_MTU ETH_MIN_MTU 3964 #define MAX_MTU ETH_MAX_MTU 3965 3966 static int virtnet_validate(struct virtio_device *vdev) 3967 { 3968 if (!vdev->config->get) { 3969 dev_err(&vdev->dev, "%s failure: config access disabled\n", 3970 __func__); 3971 return -EINVAL; 3972 } 3973 3974 if (!virtnet_validate_features(vdev)) 3975 return -EINVAL; 3976 3977 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 3978 int mtu = virtio_cread16(vdev, 3979 offsetof(struct virtio_net_config, 3980 mtu)); 3981 if (mtu < MIN_MTU) 3982 __virtio_clear_bit(vdev, VIRTIO_NET_F_MTU); 3983 } 3984 3985 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY) && 3986 !virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 3987 dev_warn(&vdev->dev, "device advertises feature VIRTIO_NET_F_STANDBY but not VIRTIO_NET_F_MAC, disabling standby"); 3988 __virtio_clear_bit(vdev, VIRTIO_NET_F_STANDBY); 3989 } 3990 3991 return 0; 3992 } 3993 3994 static bool virtnet_check_guest_gso(const struct virtnet_info *vi) 3995 { 3996 return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) || 3997 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) || 3998 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) || 3999 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO) || 4000 (virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO4) && 4001 virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_USO6)); 4002 } 4003 4004 static void virtnet_set_big_packets(struct virtnet_info *vi, const int mtu) 4005 { 4006 bool guest_gso = virtnet_check_guest_gso(vi); 4007 4008 /* If device can receive ANY guest GSO packets, regardless of mtu, 4009 * allocate packets of maximum size, otherwise limit it to only 4010 * mtu size worth only. 4011 */ 4012 if (mtu > ETH_DATA_LEN || guest_gso) { 4013 vi->big_packets = true; 4014 vi->big_packets_num_skbfrags = guest_gso ? MAX_SKB_FRAGS : DIV_ROUND_UP(mtu, PAGE_SIZE); 4015 } 4016 } 4017 4018 static int virtnet_probe(struct virtio_device *vdev) 4019 { 4020 int i, err = -ENOMEM; 4021 struct net_device *dev; 4022 struct virtnet_info *vi; 4023 u16 max_queue_pairs; 4024 int mtu = 0; 4025 4026 /* Find if host supports multiqueue/rss virtio_net device */ 4027 max_queue_pairs = 1; 4028 if (virtio_has_feature(vdev, VIRTIO_NET_F_MQ) || virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 4029 max_queue_pairs = 4030 virtio_cread16(vdev, offsetof(struct virtio_net_config, max_virtqueue_pairs)); 4031 4032 /* We need at least 2 queue's */ 4033 if (max_queue_pairs < VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN || 4034 max_queue_pairs > VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX || 4035 !virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 4036 max_queue_pairs = 1; 4037 4038 /* Allocate ourselves a network device with room for our info */ 4039 dev = alloc_etherdev_mq(sizeof(struct virtnet_info), max_queue_pairs); 4040 if (!dev) 4041 return -ENOMEM; 4042 4043 /* Set up network device as normal. */ 4044 dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE | 4045 IFF_TX_SKB_NO_LINEAR; 4046 dev->netdev_ops = &virtnet_netdev; 4047 dev->features = NETIF_F_HIGHDMA; 4048 4049 dev->ethtool_ops = &virtnet_ethtool_ops; 4050 SET_NETDEV_DEV(dev, &vdev->dev); 4051 4052 /* Do we support "hardware" checksums? */ 4053 if (virtio_has_feature(vdev, VIRTIO_NET_F_CSUM)) { 4054 /* This opens up the world of extra features. */ 4055 dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_SG; 4056 if (csum) 4057 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG; 4058 4059 if (virtio_has_feature(vdev, VIRTIO_NET_F_GSO)) { 4060 dev->hw_features |= NETIF_F_TSO 4061 | NETIF_F_TSO_ECN | NETIF_F_TSO6; 4062 } 4063 /* Individual feature bits: what can host handle? */ 4064 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO4)) 4065 dev->hw_features |= NETIF_F_TSO; 4066 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_TSO6)) 4067 dev->hw_features |= NETIF_F_TSO6; 4068 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_ECN)) 4069 dev->hw_features |= NETIF_F_TSO_ECN; 4070 if (virtio_has_feature(vdev, VIRTIO_NET_F_HOST_USO)) 4071 dev->hw_features |= NETIF_F_GSO_UDP_L4; 4072 4073 dev->features |= NETIF_F_GSO_ROBUST; 4074 4075 if (gso) 4076 dev->features |= dev->hw_features & NETIF_F_ALL_TSO; 4077 /* (!csum && gso) case will be fixed by register_netdev() */ 4078 } 4079 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_CSUM)) 4080 dev->features |= NETIF_F_RXCSUM; 4081 if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) || 4082 virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6)) 4083 dev->features |= NETIF_F_GRO_HW; 4084 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) 4085 dev->hw_features |= NETIF_F_GRO_HW; 4086 4087 dev->vlan_features = dev->features; 4088 dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_REDIRECT; 4089 4090 /* MTU range: 68 - 65535 */ 4091 dev->min_mtu = MIN_MTU; 4092 dev->max_mtu = MAX_MTU; 4093 4094 /* Configuration may specify what MAC to use. Otherwise random. */ 4095 if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) { 4096 u8 addr[ETH_ALEN]; 4097 4098 virtio_cread_bytes(vdev, 4099 offsetof(struct virtio_net_config, mac), 4100 addr, ETH_ALEN); 4101 eth_hw_addr_set(dev, addr); 4102 } else { 4103 eth_hw_addr_random(dev); 4104 dev_info(&vdev->dev, "Assigned random MAC address %pM\n", 4105 dev->dev_addr); 4106 } 4107 4108 /* Set up our device-specific information */ 4109 vi = netdev_priv(dev); 4110 vi->dev = dev; 4111 vi->vdev = vdev; 4112 vdev->priv = vi; 4113 4114 INIT_WORK(&vi->config_work, virtnet_config_changed_work); 4115 spin_lock_init(&vi->refill_lock); 4116 4117 if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF)) { 4118 vi->mergeable_rx_bufs = true; 4119 dev->xdp_features |= NETDEV_XDP_ACT_RX_SG; 4120 } 4121 4122 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_NOTF_COAL)) { 4123 vi->rx_usecs = 0; 4124 vi->tx_usecs = 0; 4125 vi->tx_max_packets = 0; 4126 vi->rx_max_packets = 0; 4127 } 4128 4129 if (virtio_has_feature(vdev, VIRTIO_NET_F_HASH_REPORT)) 4130 vi->has_rss_hash_report = true; 4131 4132 if (virtio_has_feature(vdev, VIRTIO_NET_F_RSS)) 4133 vi->has_rss = true; 4134 4135 if (vi->has_rss || vi->has_rss_hash_report) { 4136 vi->rss_indir_table_size = 4137 virtio_cread16(vdev, offsetof(struct virtio_net_config, 4138 rss_max_indirection_table_length)); 4139 vi->rss_key_size = 4140 virtio_cread8(vdev, offsetof(struct virtio_net_config, rss_max_key_size)); 4141 4142 vi->rss_hash_types_supported = 4143 virtio_cread32(vdev, offsetof(struct virtio_net_config, supported_hash_types)); 4144 vi->rss_hash_types_supported &= 4145 ~(VIRTIO_NET_RSS_HASH_TYPE_IP_EX | 4146 VIRTIO_NET_RSS_HASH_TYPE_TCP_EX | 4147 VIRTIO_NET_RSS_HASH_TYPE_UDP_EX); 4148 4149 dev->hw_features |= NETIF_F_RXHASH; 4150 } 4151 4152 if (vi->has_rss_hash_report) 4153 vi->hdr_len = sizeof(struct virtio_net_hdr_v1_hash); 4154 else if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF) || 4155 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4156 vi->hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf); 4157 else 4158 vi->hdr_len = sizeof(struct virtio_net_hdr); 4159 4160 if (virtio_has_feature(vdev, VIRTIO_F_ANY_LAYOUT) || 4161 virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) 4162 vi->any_header_sg = true; 4163 4164 if (virtio_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ)) 4165 vi->has_cvq = true; 4166 4167 if (virtio_has_feature(vdev, VIRTIO_NET_F_MTU)) { 4168 mtu = virtio_cread16(vdev, 4169 offsetof(struct virtio_net_config, 4170 mtu)); 4171 if (mtu < dev->min_mtu) { 4172 /* Should never trigger: MTU was previously validated 4173 * in virtnet_validate. 4174 */ 4175 dev_err(&vdev->dev, 4176 "device MTU appears to have changed it is now %d < %d", 4177 mtu, dev->min_mtu); 4178 err = -EINVAL; 4179 goto free; 4180 } 4181 4182 dev->mtu = mtu; 4183 dev->max_mtu = mtu; 4184 } 4185 4186 virtnet_set_big_packets(vi, mtu); 4187 4188 if (vi->any_header_sg) 4189 dev->needed_headroom = vi->hdr_len; 4190 4191 /* Enable multiqueue by default */ 4192 if (num_online_cpus() >= max_queue_pairs) 4193 vi->curr_queue_pairs = max_queue_pairs; 4194 else 4195 vi->curr_queue_pairs = num_online_cpus(); 4196 vi->max_queue_pairs = max_queue_pairs; 4197 4198 /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ 4199 err = init_vqs(vi); 4200 if (err) 4201 goto free; 4202 4203 #ifdef CONFIG_SYSFS 4204 if (vi->mergeable_rx_bufs) 4205 dev->sysfs_rx_queue_group = &virtio_net_mrg_rx_group; 4206 #endif 4207 netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); 4208 netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); 4209 4210 virtnet_init_settings(dev); 4211 4212 if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { 4213 vi->failover = net_failover_create(vi->dev); 4214 if (IS_ERR(vi->failover)) { 4215 err = PTR_ERR(vi->failover); 4216 goto free_vqs; 4217 } 4218 } 4219 4220 if (vi->has_rss || vi->has_rss_hash_report) 4221 virtnet_init_default_rss(vi); 4222 4223 /* serialize netdev register + virtio_device_ready() with ndo_open() */ 4224 rtnl_lock(); 4225 4226 err = register_netdevice(dev); 4227 if (err) { 4228 pr_debug("virtio_net: registering device failed\n"); 4229 rtnl_unlock(); 4230 goto free_failover; 4231 } 4232 4233 virtio_device_ready(vdev); 4234 4235 /* a random MAC address has been assigned, notify the device. 4236 * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there 4237 * because many devices work fine without getting MAC explicitly 4238 */ 4239 if (!virtio_has_feature(vdev, VIRTIO_NET_F_MAC) && 4240 virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 4241 struct scatterlist sg; 4242 4243 sg_init_one(&sg, dev->dev_addr, dev->addr_len); 4244 if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MAC, 4245 VIRTIO_NET_CTRL_MAC_ADDR_SET, &sg)) { 4246 pr_debug("virtio_net: setting MAC address failed\n"); 4247 rtnl_unlock(); 4248 err = -EINVAL; 4249 goto free_unregister_netdev; 4250 } 4251 } 4252 4253 rtnl_unlock(); 4254 4255 err = virtnet_cpu_notif_add(vi); 4256 if (err) { 4257 pr_debug("virtio_net: registering cpu notifier failed\n"); 4258 goto free_unregister_netdev; 4259 } 4260 4261 virtnet_set_queues(vi, vi->curr_queue_pairs); 4262 4263 /* Assume link up if device can't report link status, 4264 otherwise get link status from config. */ 4265 netif_carrier_off(dev); 4266 if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_STATUS)) { 4267 schedule_work(&vi->config_work); 4268 } else { 4269 vi->status = VIRTIO_NET_S_LINK_UP; 4270 virtnet_update_settings(vi); 4271 netif_carrier_on(dev); 4272 } 4273 4274 for (i = 0; i < ARRAY_SIZE(guest_offloads); i++) 4275 if (virtio_has_feature(vi->vdev, guest_offloads[i])) 4276 set_bit(guest_offloads[i], &vi->guest_offloads); 4277 vi->guest_offloads_capable = vi->guest_offloads; 4278 4279 pr_debug("virtnet: registered device %s with %d RX and TX vq's\n", 4280 dev->name, max_queue_pairs); 4281 4282 return 0; 4283 4284 free_unregister_netdev: 4285 unregister_netdev(dev); 4286 free_failover: 4287 net_failover_destroy(vi->failover); 4288 free_vqs: 4289 virtio_reset_device(vdev); 4290 cancel_delayed_work_sync(&vi->refill); 4291 free_receive_page_frags(vi); 4292 virtnet_del_vqs(vi); 4293 free: 4294 free_netdev(dev); 4295 return err; 4296 } 4297 4298 static void remove_vq_common(struct virtnet_info *vi) 4299 { 4300 virtio_reset_device(vi->vdev); 4301 4302 /* Free unused buffers in both send and recv, if any. */ 4303 free_unused_bufs(vi); 4304 4305 free_receive_bufs(vi); 4306 4307 free_receive_page_frags(vi); 4308 4309 virtnet_del_vqs(vi); 4310 } 4311 4312 static void virtnet_remove(struct virtio_device *vdev) 4313 { 4314 struct virtnet_info *vi = vdev->priv; 4315 4316 virtnet_cpu_notif_remove(vi); 4317 4318 /* Make sure no work handler is accessing the device. */ 4319 flush_work(&vi->config_work); 4320 4321 unregister_netdev(vi->dev); 4322 4323 net_failover_destroy(vi->failover); 4324 4325 remove_vq_common(vi); 4326 4327 free_netdev(vi->dev); 4328 } 4329 4330 static __maybe_unused int virtnet_freeze(struct virtio_device *vdev) 4331 { 4332 struct virtnet_info *vi = vdev->priv; 4333 4334 virtnet_cpu_notif_remove(vi); 4335 virtnet_freeze_down(vdev); 4336 remove_vq_common(vi); 4337 4338 return 0; 4339 } 4340 4341 static __maybe_unused int virtnet_restore(struct virtio_device *vdev) 4342 { 4343 struct virtnet_info *vi = vdev->priv; 4344 int err; 4345 4346 err = virtnet_restore_up(vdev); 4347 if (err) 4348 return err; 4349 virtnet_set_queues(vi, vi->curr_queue_pairs); 4350 4351 err = virtnet_cpu_notif_add(vi); 4352 if (err) { 4353 virtnet_freeze_down(vdev); 4354 remove_vq_common(vi); 4355 return err; 4356 } 4357 4358 return 0; 4359 } 4360 4361 static struct virtio_device_id id_table[] = { 4362 { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID }, 4363 { 0 }, 4364 }; 4365 4366 #define VIRTNET_FEATURES \ 4367 VIRTIO_NET_F_CSUM, VIRTIO_NET_F_GUEST_CSUM, \ 4368 VIRTIO_NET_F_MAC, \ 4369 VIRTIO_NET_F_HOST_TSO4, VIRTIO_NET_F_HOST_UFO, VIRTIO_NET_F_HOST_TSO6, \ 4370 VIRTIO_NET_F_HOST_ECN, VIRTIO_NET_F_GUEST_TSO4, VIRTIO_NET_F_GUEST_TSO6, \ 4371 VIRTIO_NET_F_GUEST_ECN, VIRTIO_NET_F_GUEST_UFO, \ 4372 VIRTIO_NET_F_HOST_USO, VIRTIO_NET_F_GUEST_USO4, VIRTIO_NET_F_GUEST_USO6, \ 4373 VIRTIO_NET_F_MRG_RXBUF, VIRTIO_NET_F_STATUS, VIRTIO_NET_F_CTRL_VQ, \ 4374 VIRTIO_NET_F_CTRL_RX, VIRTIO_NET_F_CTRL_VLAN, \ 4375 VIRTIO_NET_F_GUEST_ANNOUNCE, VIRTIO_NET_F_MQ, \ 4376 VIRTIO_NET_F_CTRL_MAC_ADDR, \ 4377 VIRTIO_NET_F_MTU, VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, \ 4378 VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \ 4379 VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \ 4380 VIRTIO_NET_F_GUEST_HDRLEN 4381 4382 static unsigned int features[] = { 4383 VIRTNET_FEATURES, 4384 }; 4385 4386 static unsigned int features_legacy[] = { 4387 VIRTNET_FEATURES, 4388 VIRTIO_NET_F_GSO, 4389 VIRTIO_F_ANY_LAYOUT, 4390 }; 4391 4392 static struct virtio_driver virtio_net_driver = { 4393 .feature_table = features, 4394 .feature_table_size = ARRAY_SIZE(features), 4395 .feature_table_legacy = features_legacy, 4396 .feature_table_size_legacy = ARRAY_SIZE(features_legacy), 4397 .driver.name = KBUILD_MODNAME, 4398 .driver.owner = THIS_MODULE, 4399 .id_table = id_table, 4400 .validate = virtnet_validate, 4401 .probe = virtnet_probe, 4402 .remove = virtnet_remove, 4403 .config_changed = virtnet_config_changed, 4404 #ifdef CONFIG_PM_SLEEP 4405 .freeze = virtnet_freeze, 4406 .restore = virtnet_restore, 4407 #endif 4408 }; 4409 4410 static __init int virtio_net_driver_init(void) 4411 { 4412 int ret; 4413 4414 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "virtio/net:online", 4415 virtnet_cpu_online, 4416 virtnet_cpu_down_prep); 4417 if (ret < 0) 4418 goto out; 4419 virtionet_online = ret; 4420 ret = cpuhp_setup_state_multi(CPUHP_VIRT_NET_DEAD, "virtio/net:dead", 4421 NULL, virtnet_cpu_dead); 4422 if (ret) 4423 goto err_dead; 4424 ret = register_virtio_driver(&virtio_net_driver); 4425 if (ret) 4426 goto err_virtio; 4427 return 0; 4428 err_virtio: 4429 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4430 err_dead: 4431 cpuhp_remove_multi_state(virtionet_online); 4432 out: 4433 return ret; 4434 } 4435 module_init(virtio_net_driver_init); 4436 4437 static __exit void virtio_net_driver_exit(void) 4438 { 4439 unregister_virtio_driver(&virtio_net_driver); 4440 cpuhp_remove_multi_state(CPUHP_VIRT_NET_DEAD); 4441 cpuhp_remove_multi_state(virtionet_online); 4442 } 4443 module_exit(virtio_net_driver_exit); 4444 4445 MODULE_DEVICE_TABLE(virtio, id_table); 4446 MODULE_DESCRIPTION("Virtio network driver"); 4447 MODULE_LICENSE("GPL"); 4448