1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/netdevice.h> 4 #include <net/netdev_lock.h> 5 #include <net/xsk_buff_pool.h> 6 #include <net/xdp_sock.h> 7 #include <net/xdp_sock_drv.h> 8 9 #include "xsk_queue.h" 10 #include "xdp_umem.h" 11 #include "xsk.h" 12 13 #define ETH_PAD_LEN (ETH_HLEN + 2 * VLAN_HLEN + ETH_FCS_LEN) 14 15 void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs) 16 { 17 if (!xs->tx) 18 return; 19 20 spin_lock(&pool->xsk_tx_list_lock); 21 list_add_rcu(&xs->tx_list, &pool->xsk_tx_list); 22 spin_unlock(&pool->xsk_tx_list_lock); 23 } 24 25 void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs) 26 { 27 if (!xs->tx) 28 return; 29 30 spin_lock(&pool->xsk_tx_list_lock); 31 list_del_rcu(&xs->tx_list); 32 spin_unlock(&pool->xsk_tx_list_lock); 33 } 34 35 void xp_destroy(struct xsk_buff_pool *pool) 36 { 37 if (!pool) 38 return; 39 40 kvfree(pool->tx_descs); 41 kvfree(pool->heads); 42 kvfree(pool); 43 } 44 45 int xp_alloc_tx_descs(struct xsk_buff_pool *pool, struct xdp_sock *xs) 46 { 47 pool->tx_descs = kvzalloc_objs(*pool->tx_descs, xs->tx->nentries); 48 if (!pool->tx_descs) 49 return -ENOMEM; 50 51 return 0; 52 } 53 54 struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs, 55 struct xdp_umem *umem) 56 { 57 bool unaligned = umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG; 58 struct xsk_buff_pool *pool; 59 struct xdp_buff_xsk *xskb; 60 u32 i, entries; 61 62 entries = unaligned ? umem->chunks : 0; 63 pool = kvzalloc_flex(*pool, free_heads, entries); 64 if (!pool) 65 goto out; 66 67 pool->heads = kvzalloc_objs(*pool->heads, umem->chunks); 68 if (!pool->heads) 69 goto out; 70 71 if (xs->tx) 72 if (xp_alloc_tx_descs(pool, xs)) 73 goto out; 74 75 pool->chunk_mask = ~((u64)umem->chunk_size - 1); 76 pool->addrs_cnt = umem->size; 77 pool->heads_cnt = umem->chunks; 78 pool->free_heads_cnt = umem->chunks; 79 pool->headroom = umem->headroom; 80 pool->chunk_size = umem->chunk_size; 81 pool->chunk_shift = ffs(umem->chunk_size) - 1; 82 pool->unaligned = unaligned; 83 pool->frame_len = umem->chunk_size - umem->headroom - 84 XDP_PACKET_HEADROOM; 85 pool->umem = umem; 86 pool->addrs = umem->addrs; 87 pool->tx_metadata_len = umem->tx_metadata_len; 88 pool->tx_sw_csum = umem->flags & XDP_UMEM_TX_SW_CSUM; 89 spin_lock_init(&pool->rx_lock); 90 INIT_LIST_HEAD(&pool->free_list); 91 INIT_LIST_HEAD(&pool->xskb_list); 92 INIT_LIST_HEAD(&pool->xsk_tx_list); 93 spin_lock_init(&pool->xsk_tx_list_lock); 94 spin_lock_init(&pool->cq_prod_lock); 95 spin_lock_init(&xs->cq_tmp->cq_cached_prod_lock); 96 refcount_set(&pool->users, 1); 97 98 pool->fq = xs->fq_tmp; 99 pool->cq = xs->cq_tmp; 100 101 for (i = 0; i < pool->free_heads_cnt; i++) { 102 xskb = &pool->heads[i]; 103 xskb->pool = pool; 104 xskb->xdp.frame_sz = umem->chunk_size - umem->headroom; 105 INIT_LIST_HEAD(&xskb->list_node); 106 if (pool->unaligned) 107 pool->free_heads[i] = xskb; 108 else 109 xp_init_xskb_addr(xskb, pool, (u64)i * pool->chunk_size); 110 } 111 112 return pool; 113 114 out: 115 xp_destroy(pool); 116 return NULL; 117 } 118 119 void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq) 120 { 121 u32 i; 122 123 for (i = 0; i < pool->heads_cnt; i++) 124 pool->heads[i].xdp.rxq = rxq; 125 } 126 EXPORT_SYMBOL(xp_set_rxq_info); 127 128 void xp_fill_cb(struct xsk_buff_pool *pool, struct xsk_cb_desc *desc) 129 { 130 u32 i; 131 132 for (i = 0; i < pool->heads_cnt; i++) { 133 struct xdp_buff_xsk *xskb = &pool->heads[i]; 134 135 memcpy(xskb->cb + desc->off, desc->src, desc->bytes); 136 } 137 } 138 EXPORT_SYMBOL(xp_fill_cb); 139 140 static void xp_disable_drv_zc(struct xsk_buff_pool *pool) 141 { 142 struct netdev_bpf bpf; 143 int err; 144 145 ASSERT_RTNL(); 146 147 if (pool->umem->zc) { 148 bpf.command = XDP_SETUP_XSK_POOL; 149 bpf.xsk.pool = NULL; 150 bpf.xsk.queue_id = pool->queue_id; 151 152 err = pool->netdev->netdev_ops->ndo_bpf(pool->netdev, &bpf); 153 154 if (err) 155 WARN(1, "Failed to disable zero-copy!\n"); 156 } 157 } 158 159 int xp_assign_dev(struct xsk_buff_pool *pool, 160 struct net_device *netdev, u16 queue_id, u16 flags) 161 { 162 u32 needed = netdev->mtu + ETH_PAD_LEN; 163 u32 segs = netdev->xdp_zc_max_segs; 164 bool mbuf = flags & XDP_USE_SG; 165 bool force_zc, force_copy; 166 struct netdev_bpf bpf; 167 u32 frame_size; 168 int err = 0; 169 170 ASSERT_RTNL(); 171 172 force_zc = flags & XDP_ZEROCOPY; 173 force_copy = flags & XDP_COPY; 174 175 if (force_zc && force_copy) 176 return -EINVAL; 177 178 if (pool->tx_sw_csum && (netdev->priv_flags & IFF_TX_SKB_NO_LINEAR)) 179 return -EOPNOTSUPP; 180 181 if (xsk_get_pool_from_qid(netdev, queue_id)) 182 return -EBUSY; 183 184 pool->netdev = netdev; 185 pool->queue_id = queue_id; 186 err = xsk_reg_pool_at_qid(netdev, pool, queue_id); 187 if (err) 188 return err; 189 190 if (mbuf) 191 pool->umem->flags |= XDP_UMEM_SG_FLAG; 192 193 if (flags & XDP_USE_NEED_WAKEUP) 194 pool->uses_need_wakeup = true; 195 /* Tx needs to be explicitly woken up the first time. Also 196 * for supporting drivers that do not implement this 197 * feature. They will always have to call sendto() or poll(). 198 */ 199 pool->cached_need_wakeup = XDP_WAKEUP_TX; 200 201 dev_hold(netdev); 202 203 if (force_copy) 204 /* For copy-mode, we are done. */ 205 return 0; 206 207 if ((netdev->xdp_features & NETDEV_XDP_ACT_XSK) != NETDEV_XDP_ACT_XSK) { 208 err = -EOPNOTSUPP; 209 goto err_unreg_pool; 210 } 211 212 if (mbuf) { 213 if (segs == 1) { 214 err = -EOPNOTSUPP; 215 goto err_unreg_pool; 216 } 217 } else { 218 segs = 1; 219 } 220 221 /* open-code xsk_pool_get_rx_frame_size() as pool->dev is not 222 * set yet at this point; we are before getting down to driver 223 */ 224 frame_size = __xsk_pool_get_rx_frame_size(pool) - 225 xsk_pool_get_tailroom(mbuf); 226 frame_size = ALIGN_DOWN(frame_size, 128); 227 228 if (needed > frame_size * segs) { 229 err = -EINVAL; 230 goto err_unreg_pool; 231 } 232 233 if (dev_get_min_mp_channel_count(netdev)) { 234 err = -EBUSY; 235 goto err_unreg_pool; 236 } 237 238 bpf.command = XDP_SETUP_XSK_POOL; 239 bpf.xsk.pool = pool; 240 bpf.xsk.queue_id = queue_id; 241 242 netdev_ops_assert_locked(netdev); 243 err = netdev->netdev_ops->ndo_bpf(netdev, &bpf); 244 if (err) 245 goto err_unreg_pool; 246 247 if (!pool->dma_pages) { 248 WARN(1, "Driver did not DMA map zero-copy buffers"); 249 err = -EINVAL; 250 goto err_unreg_xsk; 251 } 252 pool->umem->zc = true; 253 pool->xdp_zc_max_segs = netdev->xdp_zc_max_segs; 254 return 0; 255 256 err_unreg_xsk: 257 xp_disable_drv_zc(pool); 258 err_unreg_pool: 259 if (!force_zc) 260 err = 0; /* fallback to copy mode */ 261 if (err) { 262 xsk_clear_pool_at_qid(netdev, queue_id); 263 dev_put(netdev); 264 } 265 return err; 266 } 267 268 int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_sock *umem_xs, 269 struct net_device *dev, u16 queue_id) 270 { 271 u16 flags; 272 struct xdp_umem *umem = umem_xs->umem; 273 274 flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY; 275 276 if (umem->flags & XDP_UMEM_SG_FLAG) 277 flags |= XDP_USE_SG; 278 279 if (umem_xs->pool->uses_need_wakeup) 280 flags |= XDP_USE_NEED_WAKEUP; 281 282 return xp_assign_dev(pool, dev, queue_id, flags); 283 } 284 285 void xp_clear_dev(struct xsk_buff_pool *pool) 286 { 287 struct net_device *netdev = pool->netdev; 288 289 if (!pool->netdev) 290 return; 291 292 netdev_lock_ops(netdev); 293 xp_disable_drv_zc(pool); 294 xsk_clear_pool_at_qid(pool->netdev, pool->queue_id); 295 pool->netdev = NULL; 296 netdev_unlock_ops(netdev); 297 dev_put(netdev); 298 } 299 300 static void xp_release_deferred(struct work_struct *work) 301 { 302 struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool, 303 work); 304 305 rtnl_lock(); 306 xp_clear_dev(pool); 307 rtnl_unlock(); 308 309 if (pool->fq) { 310 xskq_destroy(pool->fq); 311 pool->fq = NULL; 312 } 313 314 if (pool->cq) { 315 xskq_destroy(pool->cq); 316 pool->cq = NULL; 317 } 318 319 xdp_put_umem(pool->umem, false); 320 xp_destroy(pool); 321 } 322 323 void xp_get_pool(struct xsk_buff_pool *pool) 324 { 325 refcount_inc(&pool->users); 326 } 327 328 bool xp_put_pool(struct xsk_buff_pool *pool) 329 { 330 if (!pool) 331 return false; 332 333 if (refcount_dec_and_test(&pool->users)) { 334 INIT_WORK(&pool->work, xp_release_deferred); 335 schedule_work(&pool->work); 336 return true; 337 } 338 339 return false; 340 } 341 342 static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool) 343 { 344 struct xsk_dma_map *dma_map; 345 346 list_for_each_entry(dma_map, &pool->umem->xsk_dma_list, list) { 347 if (dma_map->netdev == pool->netdev) 348 return dma_map; 349 } 350 351 return NULL; 352 } 353 354 static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_device *netdev, 355 u32 nr_pages, struct xdp_umem *umem) 356 { 357 struct xsk_dma_map *dma_map; 358 359 dma_map = kzalloc_obj(*dma_map); 360 if (!dma_map) 361 return NULL; 362 363 dma_map->dma_pages = kvzalloc_objs(*dma_map->dma_pages, nr_pages); 364 if (!dma_map->dma_pages) { 365 kfree(dma_map); 366 return NULL; 367 } 368 369 dma_map->netdev = netdev; 370 dma_map->dev = dev; 371 dma_map->dma_pages_cnt = nr_pages; 372 refcount_set(&dma_map->users, 1); 373 list_add(&dma_map->list, &umem->xsk_dma_list); 374 return dma_map; 375 } 376 377 static void xp_destroy_dma_map(struct xsk_dma_map *dma_map) 378 { 379 list_del(&dma_map->list); 380 kvfree(dma_map->dma_pages); 381 kfree(dma_map); 382 } 383 384 static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs) 385 { 386 dma_addr_t *dma; 387 u32 i; 388 389 for (i = 0; i < dma_map->dma_pages_cnt; i++) { 390 dma = &dma_map->dma_pages[i]; 391 if (*dma) { 392 *dma &= ~XSK_NEXT_PG_CONTIG_MASK; 393 dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE, 394 DMA_BIDIRECTIONAL, attrs); 395 *dma = 0; 396 } 397 } 398 399 xp_destroy_dma_map(dma_map); 400 } 401 402 void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs) 403 { 404 struct xsk_dma_map *dma_map; 405 406 if (!pool->dma_pages) 407 return; 408 409 dma_map = xp_find_dma_map(pool); 410 if (!dma_map) { 411 WARN(1, "Could not find dma_map for device"); 412 return; 413 } 414 415 if (refcount_dec_and_test(&dma_map->users)) 416 __xp_dma_unmap(dma_map, attrs); 417 418 kvfree(pool->dma_pages); 419 pool->dma_pages = NULL; 420 pool->dma_pages_cnt = 0; 421 pool->dev = NULL; 422 } 423 EXPORT_SYMBOL(xp_dma_unmap); 424 425 static void xp_check_dma_contiguity(struct xsk_dma_map *dma_map) 426 { 427 u32 i; 428 429 for (i = 0; i < dma_map->dma_pages_cnt - 1; i++) { 430 if (dma_map->dma_pages[i] + PAGE_SIZE == dma_map->dma_pages[i + 1]) 431 dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK; 432 else 433 dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK; 434 } 435 } 436 437 static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_map) 438 { 439 if (!pool->unaligned) { 440 u32 i; 441 442 for (i = 0; i < pool->heads_cnt; i++) { 443 struct xdp_buff_xsk *xskb = &pool->heads[i]; 444 u64 orig_addr; 445 446 orig_addr = xskb->xdp.data_hard_start - pool->addrs - pool->headroom; 447 xp_init_xskb_dma(xskb, pool, dma_map->dma_pages, orig_addr); 448 } 449 } 450 451 pool->dma_pages = kvzalloc_objs(*pool->dma_pages, 452 dma_map->dma_pages_cnt); 453 if (!pool->dma_pages) 454 return -ENOMEM; 455 456 pool->dev = dma_map->dev; 457 pool->dma_pages_cnt = dma_map->dma_pages_cnt; 458 memcpy(pool->dma_pages, dma_map->dma_pages, 459 pool->dma_pages_cnt * sizeof(*pool->dma_pages)); 460 461 return 0; 462 } 463 464 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev, 465 unsigned long attrs, struct page **pages, u32 nr_pages) 466 { 467 struct xsk_dma_map *dma_map; 468 dma_addr_t dma; 469 int err; 470 u32 i; 471 472 dma_map = xp_find_dma_map(pool); 473 if (dma_map) { 474 err = xp_init_dma_info(pool, dma_map); 475 if (err) 476 return err; 477 478 refcount_inc(&dma_map->users); 479 return 0; 480 } 481 482 dma_map = xp_create_dma_map(dev, pool->netdev, nr_pages, pool->umem); 483 if (!dma_map) 484 return -ENOMEM; 485 486 for (i = 0; i < dma_map->dma_pages_cnt; i++) { 487 dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE, 488 DMA_BIDIRECTIONAL, attrs); 489 if (dma_mapping_error(dev, dma)) { 490 __xp_dma_unmap(dma_map, attrs); 491 return -ENOMEM; 492 } 493 dma_map->dma_pages[i] = dma; 494 } 495 496 if (pool->unaligned) 497 xp_check_dma_contiguity(dma_map); 498 499 err = xp_init_dma_info(pool, dma_map); 500 if (err) { 501 __xp_dma_unmap(dma_map, attrs); 502 return err; 503 } 504 505 return 0; 506 } 507 EXPORT_SYMBOL(xp_dma_map); 508 509 static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool, 510 u64 addr) 511 { 512 return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size); 513 } 514 515 static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr) 516 { 517 *addr = xp_unaligned_extract_addr(*addr); 518 if (*addr >= pool->addrs_cnt || 519 *addr + pool->chunk_size > pool->addrs_cnt || 520 xp_addr_crosses_non_contig_pg(pool, *addr)) 521 return false; 522 return true; 523 } 524 525 static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr) 526 { 527 *addr = xp_aligned_extract_addr(pool, *addr); 528 return *addr < pool->addrs_cnt; 529 } 530 531 static struct xdp_buff_xsk *xp_get_xskb(struct xsk_buff_pool *pool, u64 addr) 532 { 533 struct xdp_buff_xsk *xskb; 534 535 if (pool->unaligned) { 536 xskb = pool->free_heads[--pool->free_heads_cnt]; 537 xp_init_xskb_addr(xskb, pool, addr); 538 if (pool->dma_pages) 539 xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr); 540 } else { 541 xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)]; 542 } 543 544 return xskb; 545 } 546 547 static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool) 548 { 549 struct xdp_buff_xsk *xskb; 550 u64 addr; 551 bool ok; 552 553 if (pool->free_heads_cnt == 0) 554 return NULL; 555 556 for (;;) { 557 if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) { 558 pool->fq->queue_empty_descs++; 559 return NULL; 560 } 561 562 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : 563 xp_check_aligned(pool, &addr); 564 if (!ok) { 565 pool->fq->invalid_descs++; 566 xskq_cons_release(pool->fq); 567 continue; 568 } 569 break; 570 } 571 572 xskb = xp_get_xskb(pool, addr); 573 574 xskq_cons_release(pool->fq); 575 return xskb; 576 } 577 578 struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool) 579 { 580 struct xdp_buff_xsk *xskb; 581 582 if (!pool->free_list_cnt) { 583 xskb = __xp_alloc(pool); 584 if (!xskb) 585 return NULL; 586 } else { 587 pool->free_list_cnt--; 588 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, 589 list_node); 590 list_del_init(&xskb->list_node); 591 } 592 593 xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM; 594 xskb->xdp.data_meta = xskb->xdp.data; 595 xskb->xdp.flags = 0; 596 597 if (pool->dev) 598 xp_dma_sync_for_device(pool, xskb->dma, pool->frame_len); 599 600 return &xskb->xdp; 601 } 602 EXPORT_SYMBOL(xp_alloc); 603 604 static u32 xp_alloc_new_from_fq(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) 605 { 606 u32 i, cached_cons, nb_entries; 607 608 if (max > pool->free_heads_cnt) 609 max = pool->free_heads_cnt; 610 max = xskq_cons_nb_entries(pool->fq, max); 611 612 cached_cons = pool->fq->cached_cons; 613 nb_entries = max; 614 i = max; 615 while (i--) { 616 struct xdp_buff_xsk *xskb; 617 u64 addr; 618 bool ok; 619 620 __xskq_cons_read_addr_unchecked(pool->fq, cached_cons++, &addr); 621 622 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : 623 xp_check_aligned(pool, &addr); 624 if (unlikely(!ok)) { 625 pool->fq->invalid_descs++; 626 nb_entries--; 627 continue; 628 } 629 630 xskb = xp_get_xskb(pool, addr); 631 632 *xdp = &xskb->xdp; 633 xdp++; 634 } 635 636 xskq_cons_release_n(pool->fq, max); 637 return nb_entries; 638 } 639 640 static u32 xp_alloc_reused(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 nb_entries) 641 { 642 struct xdp_buff_xsk *xskb; 643 u32 i; 644 645 nb_entries = min_t(u32, nb_entries, pool->free_list_cnt); 646 647 i = nb_entries; 648 while (i--) { 649 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, list_node); 650 list_del_init(&xskb->list_node); 651 652 *xdp = &xskb->xdp; 653 xdp++; 654 } 655 pool->free_list_cnt -= nb_entries; 656 657 return nb_entries; 658 } 659 660 static u32 xp_alloc_slow(struct xsk_buff_pool *pool, struct xdp_buff **xdp, 661 u32 max) 662 { 663 int i; 664 665 for (i = 0; i < max; i++) { 666 struct xdp_buff *buff; 667 668 buff = xp_alloc(pool); 669 if (unlikely(!buff)) 670 return i; 671 *xdp = buff; 672 xdp++; 673 } 674 675 return max; 676 } 677 678 u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) 679 { 680 u32 nb_entries1 = 0, nb_entries2; 681 682 if (unlikely(pool->dev && dma_dev_need_sync(pool->dev))) 683 return xp_alloc_slow(pool, xdp, max); 684 685 if (unlikely(pool->free_list_cnt)) { 686 nb_entries1 = xp_alloc_reused(pool, xdp, max); 687 if (nb_entries1 == max) 688 return nb_entries1; 689 690 max -= nb_entries1; 691 xdp += nb_entries1; 692 } 693 694 nb_entries2 = xp_alloc_new_from_fq(pool, xdp, max); 695 if (!nb_entries2) 696 pool->fq->queue_empty_descs++; 697 698 return nb_entries1 + nb_entries2; 699 } 700 EXPORT_SYMBOL(xp_alloc_batch); 701 702 bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count) 703 { 704 u32 req_count, avail_count; 705 706 if (pool->free_list_cnt >= count) 707 return true; 708 709 req_count = count - pool->free_list_cnt; 710 avail_count = xskq_cons_nb_entries(pool->fq, req_count); 711 if (!avail_count) 712 pool->fq->queue_empty_descs++; 713 714 return avail_count >= req_count; 715 } 716 EXPORT_SYMBOL(xp_can_alloc); 717 718 void xp_free(struct xdp_buff_xsk *xskb) 719 { 720 if (!list_empty(&xskb->list_node)) 721 return; 722 723 xskb->pool->free_list_cnt++; 724 list_add(&xskb->list_node, &xskb->pool->free_list); 725 } 726 EXPORT_SYMBOL(xp_free); 727 728 static u64 __xp_raw_get_addr(const struct xsk_buff_pool *pool, u64 addr) 729 { 730 return pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr; 731 } 732 733 static void *__xp_raw_get_data(const struct xsk_buff_pool *pool, u64 addr) 734 { 735 return pool->addrs + addr; 736 } 737 738 void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr) 739 { 740 return __xp_raw_get_data(pool, __xp_raw_get_addr(pool, addr)); 741 } 742 EXPORT_SYMBOL(xp_raw_get_data); 743 744 static dma_addr_t __xp_raw_get_dma(const struct xsk_buff_pool *pool, u64 addr) 745 { 746 return (pool->dma_pages[addr >> PAGE_SHIFT] & 747 ~XSK_NEXT_PG_CONTIG_MASK) + 748 (addr & ~PAGE_MASK); 749 } 750 751 dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr) 752 { 753 return __xp_raw_get_dma(pool, __xp_raw_get_addr(pool, addr)); 754 } 755 EXPORT_SYMBOL(xp_raw_get_dma); 756 757 /** 758 * xp_raw_get_ctx - get &xdp_desc context 759 * @pool: XSk buff pool desc address belongs to 760 * @addr: desc address (from userspace) 761 * 762 * Helper for getting desc's DMA address and metadata pointer, if present. 763 * Saves one call on hotpath, double calculation of the actual address, 764 * and inline checks for metadata presence and sanity. 765 * 766 * Return: new &xdp_desc_ctx struct containing desc's DMA address and metadata 767 * pointer, if it is present and valid (initialized to %NULL otherwise). 768 */ 769 struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr) 770 { 771 struct xdp_desc_ctx ret; 772 773 addr = __xp_raw_get_addr(pool, addr); 774 775 ret.dma = __xp_raw_get_dma(pool, addr); 776 ret.meta = __xsk_buff_get_metadata(pool, __xp_raw_get_data(pool, addr)); 777 778 return ret; 779 } 780 EXPORT_SYMBOL(xp_raw_get_ctx); 781