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 (xsk_get_pool_from_qid(netdev, queue_id)) 179 return -EBUSY; 180 181 pool->netdev = netdev; 182 pool->queue_id = queue_id; 183 err = xsk_reg_pool_at_qid(netdev, pool, queue_id); 184 if (err) 185 return err; 186 187 if (mbuf) 188 pool->umem->flags |= XDP_UMEM_SG_FLAG; 189 190 if (flags & XDP_USE_NEED_WAKEUP) 191 pool->uses_need_wakeup = true; 192 /* Tx needs to be explicitly woken up the first time. Also 193 * for supporting drivers that do not implement this 194 * feature. They will always have to call sendto() or poll(). 195 */ 196 pool->cached_need_wakeup = XDP_WAKEUP_TX; 197 198 dev_hold(netdev); 199 200 if (force_copy) 201 /* For copy-mode, we are done. */ 202 return 0; 203 204 if ((netdev->xdp_features & NETDEV_XDP_ACT_XSK) != NETDEV_XDP_ACT_XSK) { 205 err = -EOPNOTSUPP; 206 goto err_unreg_pool; 207 } 208 209 if (mbuf) { 210 if (segs == 1) { 211 err = -EOPNOTSUPP; 212 goto err_unreg_pool; 213 } 214 } else { 215 segs = 1; 216 } 217 218 /* open-code xsk_pool_get_rx_frame_size() as pool->dev is not 219 * set yet at this point; we are before getting down to driver 220 */ 221 frame_size = __xsk_pool_get_rx_frame_size(pool) - 222 xsk_pool_get_tailroom(mbuf); 223 frame_size = ALIGN_DOWN(frame_size, 128); 224 225 if (needed > frame_size * segs) { 226 err = -EINVAL; 227 goto err_unreg_pool; 228 } 229 230 if (dev_get_min_mp_channel_count(netdev)) { 231 err = -EBUSY; 232 goto err_unreg_pool; 233 } 234 235 bpf.command = XDP_SETUP_XSK_POOL; 236 bpf.xsk.pool = pool; 237 bpf.xsk.queue_id = queue_id; 238 239 netdev_ops_assert_locked(netdev); 240 err = netdev->netdev_ops->ndo_bpf(netdev, &bpf); 241 if (err) 242 goto err_unreg_pool; 243 244 if (!pool->dma_pages) { 245 WARN(1, "Driver did not DMA map zero-copy buffers"); 246 err = -EINVAL; 247 goto err_unreg_xsk; 248 } 249 pool->umem->zc = true; 250 pool->xdp_zc_max_segs = netdev->xdp_zc_max_segs; 251 return 0; 252 253 err_unreg_xsk: 254 xp_disable_drv_zc(pool); 255 err_unreg_pool: 256 if (!force_zc) 257 err = 0; /* fallback to copy mode */ 258 if (err) { 259 xsk_clear_pool_at_qid(netdev, queue_id); 260 dev_put(netdev); 261 } 262 return err; 263 } 264 265 int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_sock *umem_xs, 266 struct net_device *dev, u16 queue_id) 267 { 268 u16 flags; 269 struct xdp_umem *umem = umem_xs->umem; 270 271 flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY; 272 273 if (umem->flags & XDP_UMEM_SG_FLAG) 274 flags |= XDP_USE_SG; 275 276 if (umem_xs->pool->uses_need_wakeup) 277 flags |= XDP_USE_NEED_WAKEUP; 278 279 return xp_assign_dev(pool, dev, queue_id, flags); 280 } 281 282 void xp_clear_dev(struct xsk_buff_pool *pool) 283 { 284 struct net_device *netdev = pool->netdev; 285 286 if (!pool->netdev) 287 return; 288 289 netdev_lock_ops(netdev); 290 xp_disable_drv_zc(pool); 291 xsk_clear_pool_at_qid(pool->netdev, pool->queue_id); 292 pool->netdev = NULL; 293 netdev_unlock_ops(netdev); 294 dev_put(netdev); 295 } 296 297 static void xp_release_deferred(struct work_struct *work) 298 { 299 struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool, 300 work); 301 302 rtnl_lock(); 303 xp_clear_dev(pool); 304 rtnl_unlock(); 305 306 if (pool->fq) { 307 xskq_destroy(pool->fq); 308 pool->fq = NULL; 309 } 310 311 if (pool->cq) { 312 xskq_destroy(pool->cq); 313 pool->cq = NULL; 314 } 315 316 xdp_put_umem(pool->umem, false); 317 xp_destroy(pool); 318 } 319 320 void xp_get_pool(struct xsk_buff_pool *pool) 321 { 322 refcount_inc(&pool->users); 323 } 324 325 bool xp_put_pool(struct xsk_buff_pool *pool) 326 { 327 if (!pool) 328 return false; 329 330 if (refcount_dec_and_test(&pool->users)) { 331 INIT_WORK(&pool->work, xp_release_deferred); 332 schedule_work(&pool->work); 333 return true; 334 } 335 336 return false; 337 } 338 339 static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool) 340 { 341 struct xsk_dma_map *dma_map; 342 343 list_for_each_entry(dma_map, &pool->umem->xsk_dma_list, list) { 344 if (dma_map->netdev == pool->netdev) 345 return dma_map; 346 } 347 348 return NULL; 349 } 350 351 static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_device *netdev, 352 u32 nr_pages, struct xdp_umem *umem) 353 { 354 struct xsk_dma_map *dma_map; 355 356 dma_map = kzalloc_obj(*dma_map); 357 if (!dma_map) 358 return NULL; 359 360 dma_map->dma_pages = kvzalloc_objs(*dma_map->dma_pages, nr_pages); 361 if (!dma_map->dma_pages) { 362 kfree(dma_map); 363 return NULL; 364 } 365 366 dma_map->netdev = netdev; 367 dma_map->dev = dev; 368 dma_map->dma_pages_cnt = nr_pages; 369 refcount_set(&dma_map->users, 1); 370 list_add(&dma_map->list, &umem->xsk_dma_list); 371 return dma_map; 372 } 373 374 static void xp_destroy_dma_map(struct xsk_dma_map *dma_map) 375 { 376 list_del(&dma_map->list); 377 kvfree(dma_map->dma_pages); 378 kfree(dma_map); 379 } 380 381 static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs) 382 { 383 dma_addr_t *dma; 384 u32 i; 385 386 for (i = 0; i < dma_map->dma_pages_cnt; i++) { 387 dma = &dma_map->dma_pages[i]; 388 if (*dma) { 389 *dma &= ~XSK_NEXT_PG_CONTIG_MASK; 390 dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE, 391 DMA_BIDIRECTIONAL, attrs); 392 *dma = 0; 393 } 394 } 395 396 xp_destroy_dma_map(dma_map); 397 } 398 399 void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs) 400 { 401 struct xsk_dma_map *dma_map; 402 403 if (!pool->dma_pages) 404 return; 405 406 dma_map = xp_find_dma_map(pool); 407 if (!dma_map) { 408 WARN(1, "Could not find dma_map for device"); 409 return; 410 } 411 412 if (refcount_dec_and_test(&dma_map->users)) 413 __xp_dma_unmap(dma_map, attrs); 414 415 kvfree(pool->dma_pages); 416 pool->dma_pages = NULL; 417 pool->dma_pages_cnt = 0; 418 pool->dev = NULL; 419 } 420 EXPORT_SYMBOL(xp_dma_unmap); 421 422 static void xp_check_dma_contiguity(struct xsk_dma_map *dma_map) 423 { 424 u32 i; 425 426 for (i = 0; i < dma_map->dma_pages_cnt - 1; i++) { 427 if (dma_map->dma_pages[i] + PAGE_SIZE == dma_map->dma_pages[i + 1]) 428 dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK; 429 else 430 dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK; 431 } 432 } 433 434 static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_map) 435 { 436 if (!pool->unaligned) { 437 u32 i; 438 439 for (i = 0; i < pool->heads_cnt; i++) { 440 struct xdp_buff_xsk *xskb = &pool->heads[i]; 441 u64 orig_addr; 442 443 orig_addr = xskb->xdp.data_hard_start - pool->addrs - pool->headroom; 444 xp_init_xskb_dma(xskb, pool, dma_map->dma_pages, orig_addr); 445 } 446 } 447 448 pool->dma_pages = kvzalloc_objs(*pool->dma_pages, 449 dma_map->dma_pages_cnt); 450 if (!pool->dma_pages) 451 return -ENOMEM; 452 453 pool->dev = dma_map->dev; 454 pool->dma_pages_cnt = dma_map->dma_pages_cnt; 455 memcpy(pool->dma_pages, dma_map->dma_pages, 456 pool->dma_pages_cnt * sizeof(*pool->dma_pages)); 457 458 return 0; 459 } 460 461 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev, 462 unsigned long attrs, struct page **pages, u32 nr_pages) 463 { 464 struct xsk_dma_map *dma_map; 465 dma_addr_t dma; 466 int err; 467 u32 i; 468 469 dma_map = xp_find_dma_map(pool); 470 if (dma_map) { 471 err = xp_init_dma_info(pool, dma_map); 472 if (err) 473 return err; 474 475 refcount_inc(&dma_map->users); 476 return 0; 477 } 478 479 dma_map = xp_create_dma_map(dev, pool->netdev, nr_pages, pool->umem); 480 if (!dma_map) 481 return -ENOMEM; 482 483 for (i = 0; i < dma_map->dma_pages_cnt; i++) { 484 dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE, 485 DMA_BIDIRECTIONAL, attrs); 486 if (dma_mapping_error(dev, dma)) { 487 __xp_dma_unmap(dma_map, attrs); 488 return -ENOMEM; 489 } 490 dma_map->dma_pages[i] = dma; 491 } 492 493 if (pool->unaligned) 494 xp_check_dma_contiguity(dma_map); 495 496 err = xp_init_dma_info(pool, dma_map); 497 if (err) { 498 __xp_dma_unmap(dma_map, attrs); 499 return err; 500 } 501 502 return 0; 503 } 504 EXPORT_SYMBOL(xp_dma_map); 505 506 static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool, 507 u64 addr) 508 { 509 return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size); 510 } 511 512 static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr) 513 { 514 *addr = xp_unaligned_extract_addr(*addr); 515 if (*addr >= pool->addrs_cnt || 516 *addr + pool->chunk_size > pool->addrs_cnt || 517 xp_addr_crosses_non_contig_pg(pool, *addr)) 518 return false; 519 return true; 520 } 521 522 static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr) 523 { 524 *addr = xp_aligned_extract_addr(pool, *addr); 525 return *addr < pool->addrs_cnt; 526 } 527 528 static struct xdp_buff_xsk *xp_get_xskb(struct xsk_buff_pool *pool, u64 addr) 529 { 530 struct xdp_buff_xsk *xskb; 531 532 if (pool->unaligned) { 533 xskb = pool->free_heads[--pool->free_heads_cnt]; 534 xp_init_xskb_addr(xskb, pool, addr); 535 if (pool->dma_pages) 536 xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr); 537 } else { 538 xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)]; 539 } 540 541 return xskb; 542 } 543 544 static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool) 545 { 546 struct xdp_buff_xsk *xskb; 547 u64 addr; 548 bool ok; 549 550 if (pool->free_heads_cnt == 0) 551 return NULL; 552 553 for (;;) { 554 if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) { 555 pool->fq->queue_empty_descs++; 556 return NULL; 557 } 558 559 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : 560 xp_check_aligned(pool, &addr); 561 if (!ok) { 562 pool->fq->invalid_descs++; 563 xskq_cons_release(pool->fq); 564 continue; 565 } 566 break; 567 } 568 569 xskb = xp_get_xskb(pool, addr); 570 571 xskq_cons_release(pool->fq); 572 return xskb; 573 } 574 575 struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool) 576 { 577 struct xdp_buff_xsk *xskb; 578 579 if (!pool->free_list_cnt) { 580 xskb = __xp_alloc(pool); 581 if (!xskb) 582 return NULL; 583 } else { 584 pool->free_list_cnt--; 585 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, 586 list_node); 587 list_del_init(&xskb->list_node); 588 } 589 590 xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM; 591 xskb->xdp.data_meta = xskb->xdp.data; 592 xskb->xdp.flags = 0; 593 594 if (pool->dev) 595 xp_dma_sync_for_device(pool, xskb->dma, pool->frame_len); 596 597 return &xskb->xdp; 598 } 599 EXPORT_SYMBOL(xp_alloc); 600 601 static u32 xp_alloc_new_from_fq(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) 602 { 603 u32 i, cached_cons, nb_entries; 604 605 if (max > pool->free_heads_cnt) 606 max = pool->free_heads_cnt; 607 max = xskq_cons_nb_entries(pool->fq, max); 608 609 cached_cons = pool->fq->cached_cons; 610 nb_entries = max; 611 i = max; 612 while (i--) { 613 struct xdp_buff_xsk *xskb; 614 u64 addr; 615 bool ok; 616 617 __xskq_cons_read_addr_unchecked(pool->fq, cached_cons++, &addr); 618 619 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : 620 xp_check_aligned(pool, &addr); 621 if (unlikely(!ok)) { 622 pool->fq->invalid_descs++; 623 nb_entries--; 624 continue; 625 } 626 627 xskb = xp_get_xskb(pool, addr); 628 629 *xdp = &xskb->xdp; 630 xdp++; 631 } 632 633 xskq_cons_release_n(pool->fq, max); 634 return nb_entries; 635 } 636 637 static u32 xp_alloc_reused(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 nb_entries) 638 { 639 struct xdp_buff_xsk *xskb; 640 u32 i; 641 642 nb_entries = min_t(u32, nb_entries, pool->free_list_cnt); 643 644 i = nb_entries; 645 while (i--) { 646 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, list_node); 647 list_del_init(&xskb->list_node); 648 649 *xdp = &xskb->xdp; 650 xdp++; 651 } 652 pool->free_list_cnt -= nb_entries; 653 654 return nb_entries; 655 } 656 657 static u32 xp_alloc_slow(struct xsk_buff_pool *pool, struct xdp_buff **xdp, 658 u32 max) 659 { 660 int i; 661 662 for (i = 0; i < max; i++) { 663 struct xdp_buff *buff; 664 665 buff = xp_alloc(pool); 666 if (unlikely(!buff)) 667 return i; 668 *xdp = buff; 669 xdp++; 670 } 671 672 return max; 673 } 674 675 u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) 676 { 677 u32 nb_entries1 = 0, nb_entries2; 678 679 if (unlikely(pool->dev && dma_dev_need_sync(pool->dev))) 680 return xp_alloc_slow(pool, xdp, max); 681 682 if (unlikely(pool->free_list_cnt)) { 683 nb_entries1 = xp_alloc_reused(pool, xdp, max); 684 if (nb_entries1 == max) 685 return nb_entries1; 686 687 max -= nb_entries1; 688 xdp += nb_entries1; 689 } 690 691 nb_entries2 = xp_alloc_new_from_fq(pool, xdp, max); 692 if (!nb_entries2) 693 pool->fq->queue_empty_descs++; 694 695 return nb_entries1 + nb_entries2; 696 } 697 EXPORT_SYMBOL(xp_alloc_batch); 698 699 bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count) 700 { 701 u32 req_count, avail_count; 702 703 if (pool->free_list_cnt >= count) 704 return true; 705 706 req_count = count - pool->free_list_cnt; 707 avail_count = xskq_cons_nb_entries(pool->fq, req_count); 708 if (!avail_count) 709 pool->fq->queue_empty_descs++; 710 711 return avail_count >= req_count; 712 } 713 EXPORT_SYMBOL(xp_can_alloc); 714 715 void xp_free(struct xdp_buff_xsk *xskb) 716 { 717 if (!list_empty(&xskb->list_node)) 718 return; 719 720 xskb->pool->free_list_cnt++; 721 list_add(&xskb->list_node, &xskb->pool->free_list); 722 } 723 EXPORT_SYMBOL(xp_free); 724 725 static u64 __xp_raw_get_addr(const struct xsk_buff_pool *pool, u64 addr) 726 { 727 return pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr; 728 } 729 730 static void *__xp_raw_get_data(const struct xsk_buff_pool *pool, u64 addr) 731 { 732 return pool->addrs + addr; 733 } 734 735 void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr) 736 { 737 return __xp_raw_get_data(pool, __xp_raw_get_addr(pool, addr)); 738 } 739 EXPORT_SYMBOL(xp_raw_get_data); 740 741 static dma_addr_t __xp_raw_get_dma(const struct xsk_buff_pool *pool, u64 addr) 742 { 743 return (pool->dma_pages[addr >> PAGE_SHIFT] & 744 ~XSK_NEXT_PG_CONTIG_MASK) + 745 (addr & ~PAGE_MASK); 746 } 747 748 dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr) 749 { 750 return __xp_raw_get_dma(pool, __xp_raw_get_addr(pool, addr)); 751 } 752 EXPORT_SYMBOL(xp_raw_get_dma); 753 754 /** 755 * xp_raw_get_ctx - get &xdp_desc context 756 * @pool: XSk buff pool desc address belongs to 757 * @addr: desc address (from userspace) 758 * 759 * Helper for getting desc's DMA address and metadata pointer, if present. 760 * Saves one call on hotpath, double calculation of the actual address, 761 * and inline checks for metadata presence and sanity. 762 * 763 * Return: new &xdp_desc_ctx struct containing desc's DMA address and metadata 764 * pointer, if it is present and valid (initialized to %NULL otherwise). 765 */ 766 struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr) 767 { 768 struct xdp_desc_ctx ret; 769 770 addr = __xp_raw_get_addr(pool, addr); 771 772 ret.dma = __xp_raw_get_dma(pool, addr); 773 ret.meta = __xsk_buff_get_metadata(pool, __xp_raw_get_data(pool, addr)); 774 775 return ret; 776 } 777 EXPORT_SYMBOL(xp_raw_get_ctx); 778