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(&xs->cq_tmp->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 flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY; 251 if (umem_xs->pool->uses_need_wakeup) 252 flags |= XDP_USE_NEED_WAKEUP; 253 254 return xp_assign_dev(pool, dev, queue_id, flags); 255 } 256 257 void xp_clear_dev(struct xsk_buff_pool *pool) 258 { 259 struct net_device *netdev = pool->netdev; 260 261 if (!pool->netdev) 262 return; 263 264 netdev_lock_ops(netdev); 265 xp_disable_drv_zc(pool); 266 xsk_clear_pool_at_qid(pool->netdev, pool->queue_id); 267 pool->netdev = NULL; 268 netdev_unlock_ops(netdev); 269 dev_put(netdev); 270 } 271 272 static void xp_release_deferred(struct work_struct *work) 273 { 274 struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool, 275 work); 276 277 rtnl_lock(); 278 xp_clear_dev(pool); 279 rtnl_unlock(); 280 281 if (pool->fq) { 282 xskq_destroy(pool->fq); 283 pool->fq = NULL; 284 } 285 286 if (pool->cq) { 287 xskq_destroy(pool->cq); 288 pool->cq = NULL; 289 } 290 291 xdp_put_umem(pool->umem, false); 292 xp_destroy(pool); 293 } 294 295 void xp_get_pool(struct xsk_buff_pool *pool) 296 { 297 refcount_inc(&pool->users); 298 } 299 300 bool xp_put_pool(struct xsk_buff_pool *pool) 301 { 302 if (!pool) 303 return false; 304 305 if (refcount_dec_and_test(&pool->users)) { 306 INIT_WORK(&pool->work, xp_release_deferred); 307 schedule_work(&pool->work); 308 return true; 309 } 310 311 return false; 312 } 313 314 static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool) 315 { 316 struct xsk_dma_map *dma_map; 317 318 list_for_each_entry(dma_map, &pool->umem->xsk_dma_list, list) { 319 if (dma_map->netdev == pool->netdev) 320 return dma_map; 321 } 322 323 return NULL; 324 } 325 326 static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_device *netdev, 327 u32 nr_pages, struct xdp_umem *umem) 328 { 329 struct xsk_dma_map *dma_map; 330 331 dma_map = kzalloc(sizeof(*dma_map), GFP_KERNEL); 332 if (!dma_map) 333 return NULL; 334 335 dma_map->dma_pages = kvcalloc(nr_pages, sizeof(*dma_map->dma_pages), GFP_KERNEL); 336 if (!dma_map->dma_pages) { 337 kfree(dma_map); 338 return NULL; 339 } 340 341 dma_map->netdev = netdev; 342 dma_map->dev = dev; 343 dma_map->dma_pages_cnt = nr_pages; 344 refcount_set(&dma_map->users, 1); 345 list_add(&dma_map->list, &umem->xsk_dma_list); 346 return dma_map; 347 } 348 349 static void xp_destroy_dma_map(struct xsk_dma_map *dma_map) 350 { 351 list_del(&dma_map->list); 352 kvfree(dma_map->dma_pages); 353 kfree(dma_map); 354 } 355 356 static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs) 357 { 358 dma_addr_t *dma; 359 u32 i; 360 361 for (i = 0; i < dma_map->dma_pages_cnt; i++) { 362 dma = &dma_map->dma_pages[i]; 363 if (*dma) { 364 *dma &= ~XSK_NEXT_PG_CONTIG_MASK; 365 dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE, 366 DMA_BIDIRECTIONAL, attrs); 367 *dma = 0; 368 } 369 } 370 371 xp_destroy_dma_map(dma_map); 372 } 373 374 void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs) 375 { 376 struct xsk_dma_map *dma_map; 377 378 if (!pool->dma_pages) 379 return; 380 381 dma_map = xp_find_dma_map(pool); 382 if (!dma_map) { 383 WARN(1, "Could not find dma_map for device"); 384 return; 385 } 386 387 if (refcount_dec_and_test(&dma_map->users)) 388 __xp_dma_unmap(dma_map, attrs); 389 390 kvfree(pool->dma_pages); 391 pool->dma_pages = NULL; 392 pool->dma_pages_cnt = 0; 393 pool->dev = NULL; 394 } 395 EXPORT_SYMBOL(xp_dma_unmap); 396 397 static void xp_check_dma_contiguity(struct xsk_dma_map *dma_map) 398 { 399 u32 i; 400 401 for (i = 0; i < dma_map->dma_pages_cnt - 1; i++) { 402 if (dma_map->dma_pages[i] + PAGE_SIZE == dma_map->dma_pages[i + 1]) 403 dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK; 404 else 405 dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK; 406 } 407 } 408 409 static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_map) 410 { 411 if (!pool->unaligned) { 412 u32 i; 413 414 for (i = 0; i < pool->heads_cnt; i++) { 415 struct xdp_buff_xsk *xskb = &pool->heads[i]; 416 u64 orig_addr; 417 418 orig_addr = xskb->xdp.data_hard_start - pool->addrs - pool->headroom; 419 xp_init_xskb_dma(xskb, pool, dma_map->dma_pages, orig_addr); 420 } 421 } 422 423 pool->dma_pages = kvcalloc(dma_map->dma_pages_cnt, sizeof(*pool->dma_pages), GFP_KERNEL); 424 if (!pool->dma_pages) 425 return -ENOMEM; 426 427 pool->dev = dma_map->dev; 428 pool->dma_pages_cnt = dma_map->dma_pages_cnt; 429 memcpy(pool->dma_pages, dma_map->dma_pages, 430 pool->dma_pages_cnt * sizeof(*pool->dma_pages)); 431 432 return 0; 433 } 434 435 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev, 436 unsigned long attrs, struct page **pages, u32 nr_pages) 437 { 438 struct xsk_dma_map *dma_map; 439 dma_addr_t dma; 440 int err; 441 u32 i; 442 443 dma_map = xp_find_dma_map(pool); 444 if (dma_map) { 445 err = xp_init_dma_info(pool, dma_map); 446 if (err) 447 return err; 448 449 refcount_inc(&dma_map->users); 450 return 0; 451 } 452 453 dma_map = xp_create_dma_map(dev, pool->netdev, nr_pages, pool->umem); 454 if (!dma_map) 455 return -ENOMEM; 456 457 for (i = 0; i < dma_map->dma_pages_cnt; i++) { 458 dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE, 459 DMA_BIDIRECTIONAL, attrs); 460 if (dma_mapping_error(dev, dma)) { 461 __xp_dma_unmap(dma_map, attrs); 462 return -ENOMEM; 463 } 464 dma_map->dma_pages[i] = dma; 465 } 466 467 if (pool->unaligned) 468 xp_check_dma_contiguity(dma_map); 469 470 err = xp_init_dma_info(pool, dma_map); 471 if (err) { 472 __xp_dma_unmap(dma_map, attrs); 473 return err; 474 } 475 476 return 0; 477 } 478 EXPORT_SYMBOL(xp_dma_map); 479 480 static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool, 481 u64 addr) 482 { 483 return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size); 484 } 485 486 static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr) 487 { 488 *addr = xp_unaligned_extract_addr(*addr); 489 if (*addr >= pool->addrs_cnt || 490 *addr + pool->chunk_size > pool->addrs_cnt || 491 xp_addr_crosses_non_contig_pg(pool, *addr)) 492 return false; 493 return true; 494 } 495 496 static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr) 497 { 498 *addr = xp_aligned_extract_addr(pool, *addr); 499 return *addr < pool->addrs_cnt; 500 } 501 502 static struct xdp_buff_xsk *xp_get_xskb(struct xsk_buff_pool *pool, u64 addr) 503 { 504 struct xdp_buff_xsk *xskb; 505 506 if (pool->unaligned) { 507 xskb = pool->free_heads[--pool->free_heads_cnt]; 508 xp_init_xskb_addr(xskb, pool, addr); 509 if (pool->dma_pages) 510 xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr); 511 } else { 512 xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)]; 513 } 514 515 return xskb; 516 } 517 518 static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool) 519 { 520 struct xdp_buff_xsk *xskb; 521 u64 addr; 522 bool ok; 523 524 if (pool->free_heads_cnt == 0) 525 return NULL; 526 527 for (;;) { 528 if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) { 529 pool->fq->queue_empty_descs++; 530 return NULL; 531 } 532 533 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : 534 xp_check_aligned(pool, &addr); 535 if (!ok) { 536 pool->fq->invalid_descs++; 537 xskq_cons_release(pool->fq); 538 continue; 539 } 540 break; 541 } 542 543 xskb = xp_get_xskb(pool, addr); 544 545 xskq_cons_release(pool->fq); 546 return xskb; 547 } 548 549 struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool) 550 { 551 struct xdp_buff_xsk *xskb; 552 553 if (!pool->free_list_cnt) { 554 xskb = __xp_alloc(pool); 555 if (!xskb) 556 return NULL; 557 } else { 558 pool->free_list_cnt--; 559 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, 560 list_node); 561 list_del_init(&xskb->list_node); 562 } 563 564 xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM; 565 xskb->xdp.data_meta = xskb->xdp.data; 566 xskb->xdp.flags = 0; 567 568 if (pool->dev) 569 xp_dma_sync_for_device(pool, xskb->dma, pool->frame_len); 570 571 return &xskb->xdp; 572 } 573 EXPORT_SYMBOL(xp_alloc); 574 575 static u32 xp_alloc_new_from_fq(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) 576 { 577 u32 i, cached_cons, nb_entries; 578 579 if (max > pool->free_heads_cnt) 580 max = pool->free_heads_cnt; 581 max = xskq_cons_nb_entries(pool->fq, max); 582 583 cached_cons = pool->fq->cached_cons; 584 nb_entries = max; 585 i = max; 586 while (i--) { 587 struct xdp_buff_xsk *xskb; 588 u64 addr; 589 bool ok; 590 591 __xskq_cons_read_addr_unchecked(pool->fq, cached_cons++, &addr); 592 593 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) : 594 xp_check_aligned(pool, &addr); 595 if (unlikely(!ok)) { 596 pool->fq->invalid_descs++; 597 nb_entries--; 598 continue; 599 } 600 601 xskb = xp_get_xskb(pool, addr); 602 603 *xdp = &xskb->xdp; 604 xdp++; 605 } 606 607 xskq_cons_release_n(pool->fq, max); 608 return nb_entries; 609 } 610 611 static u32 xp_alloc_reused(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 nb_entries) 612 { 613 struct xdp_buff_xsk *xskb; 614 u32 i; 615 616 nb_entries = min_t(u32, nb_entries, pool->free_list_cnt); 617 618 i = nb_entries; 619 while (i--) { 620 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, list_node); 621 list_del_init(&xskb->list_node); 622 623 *xdp = &xskb->xdp; 624 xdp++; 625 } 626 pool->free_list_cnt -= nb_entries; 627 628 return nb_entries; 629 } 630 631 static u32 xp_alloc_slow(struct xsk_buff_pool *pool, struct xdp_buff **xdp, 632 u32 max) 633 { 634 int i; 635 636 for (i = 0; i < max; i++) { 637 struct xdp_buff *buff; 638 639 buff = xp_alloc(pool); 640 if (unlikely(!buff)) 641 return i; 642 *xdp = buff; 643 xdp++; 644 } 645 646 return max; 647 } 648 649 u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max) 650 { 651 u32 nb_entries1 = 0, nb_entries2; 652 653 if (unlikely(pool->dev && dma_dev_need_sync(pool->dev))) 654 return xp_alloc_slow(pool, xdp, max); 655 656 if (unlikely(pool->free_list_cnt)) { 657 nb_entries1 = xp_alloc_reused(pool, xdp, max); 658 if (nb_entries1 == max) 659 return nb_entries1; 660 661 max -= nb_entries1; 662 xdp += nb_entries1; 663 } 664 665 nb_entries2 = xp_alloc_new_from_fq(pool, xdp, max); 666 if (!nb_entries2) 667 pool->fq->queue_empty_descs++; 668 669 return nb_entries1 + nb_entries2; 670 } 671 EXPORT_SYMBOL(xp_alloc_batch); 672 673 bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count) 674 { 675 u32 req_count, avail_count; 676 677 if (pool->free_list_cnt >= count) 678 return true; 679 680 req_count = count - pool->free_list_cnt; 681 avail_count = xskq_cons_nb_entries(pool->fq, req_count); 682 if (!avail_count) 683 pool->fq->queue_empty_descs++; 684 685 return avail_count >= req_count; 686 } 687 EXPORT_SYMBOL(xp_can_alloc); 688 689 void xp_free(struct xdp_buff_xsk *xskb) 690 { 691 if (!list_empty(&xskb->list_node)) 692 return; 693 694 xskb->pool->free_list_cnt++; 695 list_add(&xskb->list_node, &xskb->pool->free_list); 696 } 697 EXPORT_SYMBOL(xp_free); 698 699 static u64 __xp_raw_get_addr(const struct xsk_buff_pool *pool, u64 addr) 700 { 701 return pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr; 702 } 703 704 static void *__xp_raw_get_data(const struct xsk_buff_pool *pool, u64 addr) 705 { 706 return pool->addrs + addr; 707 } 708 709 void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr) 710 { 711 return __xp_raw_get_data(pool, __xp_raw_get_addr(pool, addr)); 712 } 713 EXPORT_SYMBOL(xp_raw_get_data); 714 715 static dma_addr_t __xp_raw_get_dma(const struct xsk_buff_pool *pool, u64 addr) 716 { 717 return (pool->dma_pages[addr >> PAGE_SHIFT] & 718 ~XSK_NEXT_PG_CONTIG_MASK) + 719 (addr & ~PAGE_MASK); 720 } 721 722 dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr) 723 { 724 return __xp_raw_get_dma(pool, __xp_raw_get_addr(pool, addr)); 725 } 726 EXPORT_SYMBOL(xp_raw_get_dma); 727 728 /** 729 * xp_raw_get_ctx - get &xdp_desc context 730 * @pool: XSk buff pool desc address belongs to 731 * @addr: desc address (from userspace) 732 * 733 * Helper for getting desc's DMA address and metadata pointer, if present. 734 * Saves one call on hotpath, double calculation of the actual address, 735 * and inline checks for metadata presence and sanity. 736 * 737 * Return: new &xdp_desc_ctx struct containing desc's DMA address and metadata 738 * pointer, if it is present and valid (initialized to %NULL otherwise). 739 */ 740 struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr) 741 { 742 struct xdp_desc_ctx ret; 743 744 addr = __xp_raw_get_addr(pool, addr); 745 746 ret.dma = __xp_raw_get_dma(pool, addr); 747 ret.meta = __xsk_buff_get_metadata(pool, __xp_raw_get_data(pool, addr)); 748 749 return ret; 750 } 751 EXPORT_SYMBOL(xp_raw_get_ctx); 752