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