net/xdp/xsk_buff_pool.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <net/xsk_buff_pool.h>
   4 #include <net/xdp_sock.h>
   5 #include <net/xdp_sock_drv.h>
   6
   7 #include "xsk_queue.h"
   8 #include "xdp_umem.h"
   9 #include "xsk.h"
  10
  11 void xp_add_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs)
  12 {
  13         unsigned long flags;
  14
  15         if (!xs->tx)
  16                 return;
  17
  18         spin_lock_irqsave(&pool->xsk_tx_list_lock, flags);
  19         list_add_rcu(&xs->tx_list, &pool->xsk_tx_list);
  20         spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags);
  21 }
  22
  23 void xp_del_xsk(struct xsk_buff_pool *pool, struct xdp_sock *xs)
  24 {
  25         unsigned long flags;
  26
  27         if (!xs->tx)
  28                 return;
  29
  30         spin_lock_irqsave(&pool->xsk_tx_list_lock, flags);
  31         list_del_rcu(&xs->tx_list);
  32         spin_unlock_irqrestore(&pool->xsk_tx_list_lock, flags);
  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 = kvcalloc(xs->tx->nentries, sizeof(*pool->tx_descs),
  48                                   GFP_KERNEL);
  49         if (!pool->tx_descs)
  50                 return -ENOMEM;
  51
  52         return 0;
  53 }
  54
  55 struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
  56                                                 struct xdp_umem *umem)
  57 {
  58         bool unaligned = umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG;
  59         struct xsk_buff_pool *pool;
  60         struct xdp_buff_xsk *xskb;
  61         u32 i, entries;
  62
  63         entries = unaligned ? umem->chunks : 0;
  64         pool = kvzalloc(struct_size(pool, free_heads, entries), GFP_KERNEL);
  65         if (!pool)
  66                 goto out;
  67
  68         pool->heads = kvcalloc(umem->chunks, sizeof(*pool->heads), GFP_KERNEL);
  69         if (!pool->heads)
  70                 goto out;
  71
  72         if (xs->tx)
  73                 if (xp_alloc_tx_descs(pool, xs))
  74                         goto out;
  75
  76         pool->chunk_mask = ~((u64)umem->chunk_size - 1);
  77         pool->addrs_cnt = umem->size;
  78         pool->heads_cnt = umem->chunks;
  79         pool->free_heads_cnt = umem->chunks;
  80         pool->headroom = umem->headroom;
  81         pool->chunk_size = umem->chunk_size;
  82         pool->chunk_shift = ffs(umem->chunk_size) - 1;
  83         pool->unaligned = unaligned;
  84         pool->frame_len = umem->chunk_size - umem->headroom -
  85                 XDP_PACKET_HEADROOM;
  86         pool->umem = umem;
  87         pool->addrs = umem->addrs;
  88         INIT_LIST_HEAD(&pool->free_list);
  89         INIT_LIST_HEAD(&pool->xsk_tx_list);
  90         spin_lock_init(&pool->xsk_tx_list_lock);
  91         spin_lock_init(&pool->cq_lock);
  92         refcount_set(&pool->users, 1);
  93
  94         pool->fq = xs->fq_tmp;
  95         pool->cq = xs->cq_tmp;
  96
  97         for (i = 0; i < pool->free_heads_cnt; i++) {
  98                 xskb = &pool->heads[i];
  99                 xskb->pool = pool;
 100                 xskb->xdp.frame_sz = umem->chunk_size - umem->headroom;
 101                 INIT_LIST_HEAD(&xskb->free_list_node);
 102                 if (pool->unaligned)
 103                         pool->free_heads[i] = xskb;
 104                 else
 105                         xp_init_xskb_addr(xskb, pool, i * pool->chunk_size);
 106         }
 107
 108         return pool;
 109
 110 out:
 111         xp_destroy(pool);
 112         return NULL;
 113 }
 114
 115 void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq)
 116 {
 117         u32 i;
 118
 119         for (i = 0; i < pool->heads_cnt; i++)
 120                 pool->heads[i].xdp.rxq = rxq;
 121 }
 122 EXPORT_SYMBOL(xp_set_rxq_info);
 123
 124 static void xp_disable_drv_zc(struct xsk_buff_pool *pool)
 125 {
 126         struct netdev_bpf bpf;
 127         int err;
 128
 129         ASSERT_RTNL();
 130
 131         if (pool->umem->zc) {
 132                 bpf.command = XDP_SETUP_XSK_POOL;
 133                 bpf.xsk.pool = NULL;
 134                 bpf.xsk.queue_id = pool->queue_id;
 135
 136                 err = pool->netdev->netdev_ops->ndo_bpf(pool->netdev, &bpf);
 137
 138                 if (err)
 139                         WARN(1, "Failed to disable zero-copy!\n");
 140         }
 141 }
 142
 143 int xp_assign_dev(struct xsk_buff_pool *pool,
 144                   struct net_device *netdev, u16 queue_id, u16 flags)
 145 {
 146         bool force_zc, force_copy;
 147         struct netdev_bpf bpf;
 148         int err = 0;
 149
 150         ASSERT_RTNL();
 151
 152         force_zc = flags & XDP_ZEROCOPY;
 153         force_copy = flags & XDP_COPY;
 154
 155         if (force_zc && force_copy)
 156                 return -EINVAL;
 157
 158         if (xsk_get_pool_from_qid(netdev, queue_id))
 159                 return -EBUSY;
 160
 161         pool->netdev = netdev;
 162         pool->queue_id = queue_id;
 163         err = xsk_reg_pool_at_qid(netdev, pool, queue_id);
 164         if (err)
 165                 return err;
 166
 167         if (flags & XDP_USE_NEED_WAKEUP)
 168                 pool->uses_need_wakeup = true;
 169         /* Tx needs to be explicitly woken up the first time.  Also
 170          * for supporting drivers that do not implement this
 171          * feature. They will always have to call sendto() or poll().
 172          */
 173         pool->cached_need_wakeup = XDP_WAKEUP_TX;
 174
 175         dev_hold(netdev);
 176
 177         if (force_copy)
 178                 /* For copy-mode, we are done. */
 179                 return 0;
 180
 181         if (!netdev->netdev_ops->ndo_bpf ||
 182             !netdev->netdev_ops->ndo_xsk_wakeup) {
 183                 err = -EOPNOTSUPP;
 184                 goto err_unreg_pool;
 185         }
 186
 187         bpf.command = XDP_SETUP_XSK_POOL;
 188         bpf.xsk.pool = pool;
 189         bpf.xsk.queue_id = queue_id;
 190
 191         err = netdev->netdev_ops->ndo_bpf(netdev, &bpf);
 192         if (err)
 193                 goto err_unreg_pool;
 194
 195         if (!pool->dma_pages) {
 196                 WARN(1, "Driver did not DMA map zero-copy buffers");
 197                 err = -EINVAL;
 198                 goto err_unreg_xsk;
 199         }
 200         pool->umem->zc = true;
 201         return 0;
 202
 203 err_unreg_xsk:
 204         xp_disable_drv_zc(pool);
 205 err_unreg_pool:
 206         if (!force_zc)
 207                 err = 0; /* fallback to copy mode */
 208         if (err) {
 209                 xsk_clear_pool_at_qid(netdev, queue_id);
 210                 dev_put(netdev);
 211         }
 212         return err;
 213 }
 214
 215 int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
 216                          struct net_device *dev, u16 queue_id)
 217 {
 218         u16 flags;
 219
 220         /* One fill and completion ring required for each queue id. */
 221         if (!pool->fq || !pool->cq)
 222                 return -EINVAL;
 223
 224         flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY;
 225         if (pool->uses_need_wakeup)
 226                 flags |= XDP_USE_NEED_WAKEUP;
 227
 228         return xp_assign_dev(pool, dev, queue_id, flags);
 229 }
 230
 231 void xp_clear_dev(struct xsk_buff_pool *pool)
 232 {
 233         if (!pool->netdev)
 234                 return;
 235
 236         xp_disable_drv_zc(pool);
 237         xsk_clear_pool_at_qid(pool->netdev, pool->queue_id);
 238         dev_put(pool->netdev);
 239         pool->netdev = NULL;
 240 }
 241
 242 static void xp_release_deferred(struct work_struct *work)
 243 {
 244         struct xsk_buff_pool *pool = container_of(work, struct xsk_buff_pool,
 245                                                   work);
 246
 247         rtnl_lock();
 248         xp_clear_dev(pool);
 249         rtnl_unlock();
 250
 251         if (pool->fq) {
 252                 xskq_destroy(pool->fq);
 253                 pool->fq = NULL;
 254         }
 255
 256         if (pool->cq) {
 257                 xskq_destroy(pool->cq);
 258                 pool->cq = NULL;
 259         }
 260
 261         xdp_put_umem(pool->umem, false);
 262         xp_destroy(pool);
 263 }
 264
 265 void xp_get_pool(struct xsk_buff_pool *pool)
 266 {
 267         refcount_inc(&pool->users);
 268 }
 269
 270 bool xp_put_pool(struct xsk_buff_pool *pool)
 271 {
 272         if (!pool)
 273                 return false;
 274
 275         if (refcount_dec_and_test(&pool->users)) {
 276                 INIT_WORK(&pool->work, xp_release_deferred);
 277                 schedule_work(&pool->work);
 278                 return true;
 279         }
 280
 281         return false;
 282 }
 283
 284 static struct xsk_dma_map *xp_find_dma_map(struct xsk_buff_pool *pool)
 285 {
 286         struct xsk_dma_map *dma_map;
 287
 288         list_for_each_entry(dma_map, &pool->umem->xsk_dma_list, list) {
 289                 if (dma_map->netdev == pool->netdev)
 290                         return dma_map;
 291         }
 292
 293         return NULL;
 294 }
 295
 296 static struct xsk_dma_map *xp_create_dma_map(struct device *dev, struct net_device *netdev,
 297                                              u32 nr_pages, struct xdp_umem *umem)
 298 {
 299         struct xsk_dma_map *dma_map;
 300
 301         dma_map = kzalloc(sizeof(*dma_map), GFP_KERNEL);
 302         if (!dma_map)
 303                 return NULL;
 304
 305         dma_map->dma_pages = kvcalloc(nr_pages, sizeof(*dma_map->dma_pages), GFP_KERNEL);
 306         if (!dma_map->dma_pages) {
 307                 kfree(dma_map);
 308                 return NULL;
 309         }
 310
 311         dma_map->netdev = netdev;
 312         dma_map->dev = dev;
 313         dma_map->dma_need_sync = false;
 314         dma_map->dma_pages_cnt = nr_pages;
 315         refcount_set(&dma_map->users, 1);
 316         list_add(&dma_map->list, &umem->xsk_dma_list);
 317         return dma_map;
 318 }
 319
 320 static void xp_destroy_dma_map(struct xsk_dma_map *dma_map)
 321 {
 322         list_del(&dma_map->list);
 323         kvfree(dma_map->dma_pages);
 324         kfree(dma_map);
 325 }
 326
 327 static void __xp_dma_unmap(struct xsk_dma_map *dma_map, unsigned long attrs)
 328 {
 329         dma_addr_t *dma;
 330         u32 i;
 331
 332         for (i = 0; i < dma_map->dma_pages_cnt; i++) {
 333                 dma = &dma_map->dma_pages[i];
 334                 if (*dma) {
 335                         *dma &= ~XSK_NEXT_PG_CONTIG_MASK;
 336                         dma_unmap_page_attrs(dma_map->dev, *dma, PAGE_SIZE,
 337                                              DMA_BIDIRECTIONAL, attrs);
 338                         *dma = 0;
 339                 }
 340         }
 341
 342         xp_destroy_dma_map(dma_map);
 343 }
 344
 345 void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs)
 346 {
 347         struct xsk_dma_map *dma_map;
 348
 349         if (pool->dma_pages_cnt == 0)
 350                 return;
 351
 352         dma_map = xp_find_dma_map(pool);
 353         if (!dma_map) {
 354                 WARN(1, "Could not find dma_map for device");
 355                 return;
 356         }
 357
 358         if (!refcount_dec_and_test(&dma_map->users))
 359                 return;
 360
 361         __xp_dma_unmap(dma_map, attrs);
 362         kvfree(pool->dma_pages);
 363         pool->dma_pages_cnt = 0;
 364         pool->dev = NULL;
 365 }
 366 EXPORT_SYMBOL(xp_dma_unmap);
 367
 368 static void xp_check_dma_contiguity(struct xsk_dma_map *dma_map)
 369 {
 370         u32 i;
 371
 372         for (i = 0; i < dma_map->dma_pages_cnt - 1; i++) {
 373                 if (dma_map->dma_pages[i] + PAGE_SIZE == dma_map->dma_pages[i + 1])
 374                         dma_map->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK;
 375                 else
 376                         dma_map->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK;
 377         }
 378 }
 379
 380 static int xp_init_dma_info(struct xsk_buff_pool *pool, struct xsk_dma_map *dma_map)
 381 {
 382         if (!pool->unaligned) {
 383                 u32 i;
 384
 385                 for (i = 0; i < pool->heads_cnt; i++) {
 386                         struct xdp_buff_xsk *xskb = &pool->heads[i];
 387
 388                         xp_init_xskb_dma(xskb, pool, dma_map->dma_pages, xskb->orig_addr);
 389                 }
 390         }
 391
 392         pool->dma_pages = kvcalloc(dma_map->dma_pages_cnt, sizeof(*pool->dma_pages), GFP_KERNEL);
 393         if (!pool->dma_pages)
 394                 return -ENOMEM;
 395
 396         pool->dev = dma_map->dev;
 397         pool->dma_pages_cnt = dma_map->dma_pages_cnt;
 398         pool->dma_need_sync = dma_map->dma_need_sync;
 399         memcpy(pool->dma_pages, dma_map->dma_pages,
 400                pool->dma_pages_cnt * sizeof(*pool->dma_pages));
 401
 402         return 0;
 403 }
 404
 405 int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
 406                unsigned long attrs, struct page **pages, u32 nr_pages)
 407 {
 408         struct xsk_dma_map *dma_map;
 409         dma_addr_t dma;
 410         int err;
 411         u32 i;
 412
 413         dma_map = xp_find_dma_map(pool);
 414         if (dma_map) {
 415                 err = xp_init_dma_info(pool, dma_map);
 416                 if (err)
 417                         return err;
 418
 419                 refcount_inc(&dma_map->users);
 420                 return 0;
 421         }
 422
 423         dma_map = xp_create_dma_map(dev, pool->netdev, nr_pages, pool->umem);
 424         if (!dma_map)
 425                 return -ENOMEM;
 426
 427         for (i = 0; i < dma_map->dma_pages_cnt; i++) {
 428                 dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE,
 429                                          DMA_BIDIRECTIONAL, attrs);
 430                 if (dma_mapping_error(dev, dma)) {
 431                         __xp_dma_unmap(dma_map, attrs);
 432                         return -ENOMEM;
 433                 }
 434                 if (dma_need_sync(dev, dma))
 435                         dma_map->dma_need_sync = true;
 436                 dma_map->dma_pages[i] = dma;
 437         }
 438
 439         if (pool->unaligned)
 440                 xp_check_dma_contiguity(dma_map);
 441
 442         err = xp_init_dma_info(pool, dma_map);
 443         if (err) {
 444                 __xp_dma_unmap(dma_map, attrs);
 445                 return err;
 446         }
 447
 448         return 0;
 449 }
 450 EXPORT_SYMBOL(xp_dma_map);
 451
 452 static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool,
 453                                           u64 addr)
 454 {
 455         return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size);
 456 }
 457
 458 static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr)
 459 {
 460         *addr = xp_unaligned_extract_addr(*addr);
 461         if (*addr >= pool->addrs_cnt ||
 462             *addr + pool->chunk_size > pool->addrs_cnt ||
 463             xp_addr_crosses_non_contig_pg(pool, *addr))
 464                 return false;
 465         return true;
 466 }
 467
 468 static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr)
 469 {
 470         *addr = xp_aligned_extract_addr(pool, *addr);
 471         return *addr < pool->addrs_cnt;
 472 }
 473
 474 static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool)
 475 {
 476         struct xdp_buff_xsk *xskb;
 477         u64 addr;
 478         bool ok;
 479
 480         if (pool->free_heads_cnt == 0)
 481                 return NULL;
 482
 483         for (;;) {
 484                 if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) {
 485                         pool->fq->queue_empty_descs++;
 486                         return NULL;
 487                 }
 488
 489                 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) :
 490                      xp_check_aligned(pool, &addr);
 491                 if (!ok) {
 492                         pool->fq->invalid_descs++;
 493                         xskq_cons_release(pool->fq);
 494                         continue;
 495                 }
 496                 break;
 497         }
 498
 499         if (pool->unaligned) {
 500                 xskb = pool->free_heads[--pool->free_heads_cnt];
 501                 xp_init_xskb_addr(xskb, pool, addr);
 502                 if (pool->dma_pages_cnt)
 503                         xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr);
 504         } else {
 505                 xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)];
 506         }
 507
 508         xskq_cons_release(pool->fq);
 509         return xskb;
 510 }
 511
 512 struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool)
 513 {
 514         struct xdp_buff_xsk *xskb;
 515
 516         if (!pool->free_list_cnt) {
 517                 xskb = __xp_alloc(pool);
 518                 if (!xskb)
 519                         return NULL;
 520         } else {
 521                 pool->free_list_cnt--;
 522                 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk,
 523                                         free_list_node);
 524                 list_del_init(&xskb->free_list_node);
 525         }
 526
 527         xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM;
 528         xskb->xdp.data_meta = xskb->xdp.data;
 529
 530         if (pool->dma_need_sync) {
 531                 dma_sync_single_range_for_device(pool->dev, xskb->dma, 0,
 532                                                  pool->frame_len,
 533                                                  DMA_BIDIRECTIONAL);
 534         }
 535         return &xskb->xdp;
 536 }
 537 EXPORT_SYMBOL(xp_alloc);
 538
 539 static u32 xp_alloc_new_from_fq(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
 540 {
 541         u32 i, cached_cons, nb_entries;
 542
 543         if (max > pool->free_heads_cnt)
 544                 max = pool->free_heads_cnt;
 545         max = xskq_cons_nb_entries(pool->fq, max);
 546
 547         cached_cons = pool->fq->cached_cons;
 548         nb_entries = max;
 549         i = max;
 550         while (i--) {
 551                 struct xdp_buff_xsk *xskb;
 552                 u64 addr;
 553                 bool ok;
 554
 555                 __xskq_cons_read_addr_unchecked(pool->fq, cached_cons++, &addr);
 556
 557                 ok = pool->unaligned ? xp_check_unaligned(pool, &addr) :
 558                         xp_check_aligned(pool, &addr);
 559                 if (unlikely(!ok)) {
 560                         pool->fq->invalid_descs++;
 561                         nb_entries--;
 562                         continue;
 563                 }
 564
 565                 if (pool->unaligned) {
 566                         xskb = pool->free_heads[--pool->free_heads_cnt];
 567                         xp_init_xskb_addr(xskb, pool, addr);
 568                         if (pool->dma_pages_cnt)
 569                                 xp_init_xskb_dma(xskb, pool, pool->dma_pages, addr);
 570                 } else {
 571                         xskb = &pool->heads[xp_aligned_extract_idx(pool, addr)];
 572                 }
 573
 574                 *xdp = &xskb->xdp;
 575                 xdp++;
 576         }
 577
 578         xskq_cons_release_n(pool->fq, max);
 579         return nb_entries;
 580 }
 581
 582 static u32 xp_alloc_reused(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 nb_entries)
 583 {
 584         struct xdp_buff_xsk *xskb;
 585         u32 i;
 586
 587         nb_entries = min_t(u32, nb_entries, pool->free_list_cnt);
 588
 589         i = nb_entries;
 590         while (i--) {
 591                 xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk, free_list_node);
 592                 list_del_init(&xskb->free_list_node);
 593
 594                 *xdp = &xskb->xdp;
 595                 xdp++;
 596         }
 597         pool->free_list_cnt -= nb_entries;
 598
 599         return nb_entries;
 600 }
 601
 602 u32 xp_alloc_batch(struct xsk_buff_pool *pool, struct xdp_buff **xdp, u32 max)
 603 {
 604         u32 nb_entries1 = 0, nb_entries2;
 605
 606         if (unlikely(pool->dma_need_sync)) {
 607                 struct xdp_buff *buff;
 608
 609                 /* Slow path */
 610                 buff = xp_alloc(pool);
 611                 if (buff)
 612                         *xdp = buff;
 613                 return !!buff;
 614         }
 615
 616         if (unlikely(pool->free_list_cnt)) {
 617                 nb_entries1 = xp_alloc_reused(pool, xdp, max);
 618                 if (nb_entries1 == max)
 619                         return nb_entries1;
 620
 621                 max -= nb_entries1;
 622                 xdp += nb_entries1;
 623         }
 624
 625         nb_entries2 = xp_alloc_new_from_fq(pool, xdp, max);
 626         if (!nb_entries2)
 627                 pool->fq->queue_empty_descs++;
 628
 629         return nb_entries1 + nb_entries2;
 630 }
 631 EXPORT_SYMBOL(xp_alloc_batch);
 632
 633 bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count)
 634 {
 635         if (pool->free_list_cnt >= count)
 636                 return true;
 637         return xskq_cons_has_entries(pool->fq, count - pool->free_list_cnt);
 638 }
 639 EXPORT_SYMBOL(xp_can_alloc);
 640
 641 void xp_free(struct xdp_buff_xsk *xskb)
 642 {
 643         if (!list_empty(&xskb->free_list_node))
 644                 return;
 645
 646         xskb->pool->free_list_cnt++;
 647         list_add(&xskb->free_list_node, &xskb->pool->free_list);
 648 }
 649 EXPORT_SYMBOL(xp_free);
 650
 651 void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
 652 {
 653         addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
 654         return pool->addrs + addr;
 655 }
 656 EXPORT_SYMBOL(xp_raw_get_data);
 657
 658 dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr)
 659 {
 660         addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
 661         return (pool->dma_pages[addr >> PAGE_SHIFT] &
 662                 ~XSK_NEXT_PG_CONTIG_MASK) +
 663                 (addr & ~PAGE_MASK);
 664 }
 665 EXPORT_SYMBOL(xp_raw_get_dma);
 666
 667 void xp_dma_sync_for_cpu_slow(struct xdp_buff_xsk *xskb)
 668 {
 669         dma_sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0,
 670                                       xskb->pool->frame_len, DMA_BIDIRECTIONAL);
 671 }
 672 EXPORT_SYMBOL(xp_dma_sync_for_cpu_slow);
 673
 674 void xp_dma_sync_for_device_slow(struct xsk_buff_pool *pool, dma_addr_t dma,
 675                                  size_t size)
 676 {
 677         dma_sync_single_range_for_device(pool->dev, dma, 0,
 678                                          size, DMA_BIDIRECTIONAL);
 679 }
 680 EXPORT_SYMBOL(xp_dma_sync_for_device_slow);