lib/librte_hash/rte_cuckoo_hash.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <string.h>
  35 #include <stdint.h>
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <stdarg.h>
  39 #include <sys/queue.h>
  40
  41 #include <rte_common.h>
  42 #include <rte_memory.h>         /* for definition of RTE_CACHE_LINE_SIZE */
  43 #include <rte_log.h>
  44 #include <rte_memcpy.h>
  45 #include <rte_prefetch.h>
  46 #include <rte_branch_prediction.h>
  47 #include <rte_memzone.h>
  48 #include <rte_malloc.h>
  49 #include <rte_eal.h>
  50 #include <rte_eal_memconfig.h>
  51 #include <rte_per_lcore.h>
  52 #include <rte_errno.h>
  53 #include <rte_string_fns.h>
  54 #include <rte_cpuflags.h>
  55 #include <rte_log.h>
  56 #include <rte_rwlock.h>
  57 #include <rte_spinlock.h>
  58 #include <rte_ring.h>
  59 #include <rte_compat.h>
  60
  61 #include "rte_hash.h"
  62 #include "rte_cuckoo_hash.h"
  63
  64 #if defined(RTE_ARCH_X86)
  65 #include "rte_cuckoo_hash_x86.h"
  66 #endif
  67
  68 TAILQ_HEAD(rte_hash_list, rte_tailq_entry);
  69
  70 static struct rte_tailq_elem rte_hash_tailq = {
  71         .name = "RTE_HASH",
  72 };
  73 EAL_REGISTER_TAILQ(rte_hash_tailq)
  74
  75 struct rte_hash *
  76 rte_hash_find_existing(const char *name)
  77 {
  78         struct rte_hash *h = NULL;
  79         struct rte_tailq_entry *te;
  80         struct rte_hash_list *hash_list;
  81
  82         hash_list = RTE_TAILQ_CAST(rte_hash_tailq.head, rte_hash_list);
  83
  84         rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
  85         TAILQ_FOREACH(te, hash_list, next) {
  86                 h = (struct rte_hash *) te->data;
  87                 if (strncmp(name, h->name, RTE_HASH_NAMESIZE) == 0)
  88                         break;
  89         }
  90         rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
  91
  92         if (te == NULL) {
  93                 rte_errno = ENOENT;
  94                 return NULL;
  95         }
  96         return h;
  97 }
  98
  99 void rte_hash_set_cmp_func(struct rte_hash *h, rte_hash_cmp_eq_t func)
 100 {
 101         h->cmp_jump_table_idx = KEY_CUSTOM;
 102         h->rte_hash_custom_cmp_eq = func;
 103 }
 104
 105 static inline int
 106 rte_hash_cmp_eq(const void *key1, const void *key2, const struct rte_hash *h)
 107 {
 108         if (h->cmp_jump_table_idx == KEY_CUSTOM)
 109                 return h->rte_hash_custom_cmp_eq(key1, key2, h->key_len);
 110         else
 111                 return cmp_jump_table[h->cmp_jump_table_idx](key1, key2, h->key_len);
 112 }
 113
 114 struct rte_hash *
 115 rte_hash_create(const struct rte_hash_parameters *params)
 116 {
 117         struct rte_hash *h = NULL;
 118         struct rte_tailq_entry *te = NULL;
 119         struct rte_hash_list *hash_list;
 120         struct rte_ring *r = NULL;
 121         char hash_name[RTE_HASH_NAMESIZE];
 122         void *k = NULL;
 123         void *buckets = NULL;
 124         char ring_name[RTE_RING_NAMESIZE];
 125         unsigned num_key_slots;
 126         unsigned hw_trans_mem_support = 0;
 127         unsigned i;
 128
 129         hash_list = RTE_TAILQ_CAST(rte_hash_tailq.head, rte_hash_list);
 130
 131         if (params == NULL) {
 132                 RTE_LOG(ERR, HASH, "rte_hash_create has no parameters\n");
 133                 return NULL;
 134         }
 135
 136         /* Check for valid parameters */
 137         if ((params->entries > RTE_HASH_ENTRIES_MAX) ||
 138                         (params->entries < RTE_HASH_BUCKET_ENTRIES) ||
 139                         !rte_is_power_of_2(RTE_HASH_BUCKET_ENTRIES) ||
 140                         (params->key_len == 0)) {
 141                 rte_errno = EINVAL;
 142                 RTE_LOG(ERR, HASH, "rte_hash_create has invalid parameters\n");
 143                 return NULL;
 144         }
 145
 146         /* Check extra flags field to check extra options. */
 147         if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT)
 148                 hw_trans_mem_support = 1;
 149
 150         /* Store all keys and leave the first entry as a dummy entry for lookup_bulk */
 151         if (hw_trans_mem_support)
 152                 /*
 153                  * Increase number of slots by total number of indices
 154                  * that can be stored in the lcore caches
 155                  * except for the first cache
 156                  */
 157                 num_key_slots = params->entries + (RTE_MAX_LCORE - 1) *
 158                                         LCORE_CACHE_SIZE + 1;
 159         else
 160                 num_key_slots = params->entries + 1;
 161
 162         snprintf(ring_name, sizeof(ring_name), "HT_%s", params->name);
 163         /* Create ring (Dummy slot index is not enqueued) */
 164         r = rte_ring_create(ring_name, rte_align32pow2(num_key_slots - 1),
 165                         params->socket_id, 0);
 166         if (r == NULL) {
 167                 RTE_LOG(ERR, HASH, "memory allocation failed\n");
 168                 goto err;
 169         }
 170
 171         snprintf(hash_name, sizeof(hash_name), "HT_%s", params->name);
 172
 173         rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
 174
 175         /* guarantee there's no existing: this is normally already checked
 176          * by ring creation above */
 177         TAILQ_FOREACH(te, hash_list, next) {
 178                 h = (struct rte_hash *) te->data;
 179                 if (strncmp(params->name, h->name, RTE_HASH_NAMESIZE) == 0)
 180                         break;
 181         }
 182         h = NULL;
 183         if (te != NULL) {
 184                 rte_errno = EEXIST;
 185                 te = NULL;
 186                 goto err_unlock;
 187         }
 188
 189         te = rte_zmalloc("HASH_TAILQ_ENTRY", sizeof(*te), 0);
 190         if (te == NULL) {
 191                 RTE_LOG(ERR, HASH, "tailq entry allocation failed\n");
 192                 goto err_unlock;
 193         }
 194
 195         h = (struct rte_hash *)rte_zmalloc_socket(hash_name, sizeof(struct rte_hash),
 196                                         RTE_CACHE_LINE_SIZE, params->socket_id);
 197
 198         if (h == NULL) {
 199                 RTE_LOG(ERR, HASH, "memory allocation failed\n");
 200                 goto err_unlock;
 201         }
 202
 203         const uint32_t num_buckets = rte_align32pow2(params->entries)
 204                                         / RTE_HASH_BUCKET_ENTRIES;
 205
 206         buckets = rte_zmalloc_socket(NULL,
 207                                 num_buckets * sizeof(struct rte_hash_bucket),
 208                                 RTE_CACHE_LINE_SIZE, params->socket_id);
 209
 210         if (buckets == NULL) {
 211                 RTE_LOG(ERR, HASH, "memory allocation failed\n");
 212                 goto err_unlock;
 213         }
 214
 215         const uint32_t key_entry_size = sizeof(struct rte_hash_key) + params->key_len;
 216         const uint64_t key_tbl_size = (uint64_t) key_entry_size * num_key_slots;
 217
 218         k = rte_zmalloc_socket(NULL, key_tbl_size,
 219                         RTE_CACHE_LINE_SIZE, params->socket_id);
 220
 221         if (k == NULL) {
 222                 RTE_LOG(ERR, HASH, "memory allocation failed\n");
 223                 goto err_unlock;
 224         }
 225
 226 /*
 227  * If x86 architecture is used, select appropriate compare function,
 228  * which may use x86 intrinsics, otherwise use memcmp
 229  */
 230 #if defined(RTE_ARCH_X86) || defined(RTE_ARCH_ARM64)
 231         /* Select function to compare keys */
 232         switch (params->key_len) {
 233         case 16:
 234                 h->cmp_jump_table_idx = KEY_16_BYTES;
 235                 break;
 236         case 32:
 237                 h->cmp_jump_table_idx = KEY_32_BYTES;
 238                 break;
 239         case 48:
 240                 h->cmp_jump_table_idx = KEY_48_BYTES;
 241                 break;
 242         case 64:
 243                 h->cmp_jump_table_idx = KEY_64_BYTES;
 244                 break;
 245         case 80:
 246                 h->cmp_jump_table_idx = KEY_80_BYTES;
 247                 break;
 248         case 96:
 249                 h->cmp_jump_table_idx = KEY_96_BYTES;
 250                 break;
 251         case 112:
 252                 h->cmp_jump_table_idx = KEY_112_BYTES;
 253                 break;
 254         case 128:
 255                 h->cmp_jump_table_idx = KEY_128_BYTES;
 256                 break;
 257         default:
 258                 /* If key is not multiple of 16, use generic memcmp */
 259                 h->cmp_jump_table_idx = KEY_OTHER_BYTES;
 260         }
 261 #else
 262         h->cmp_jump_table_idx = KEY_OTHER_BYTES;
 263 #endif
 264
 265         if (hw_trans_mem_support) {
 266                 h->local_free_slots = rte_zmalloc_socket(NULL,
 267                                 sizeof(struct lcore_cache) * RTE_MAX_LCORE,
 268                                 RTE_CACHE_LINE_SIZE, params->socket_id);
 269         }
 270
 271         /* Setup hash context */
 272         snprintf(h->name, sizeof(h->name), "%s", params->name);
 273         h->entries = params->entries;
 274         h->key_len = params->key_len;
 275         h->key_entry_size = key_entry_size;
 276         h->hash_func_init_val = params->hash_func_init_val;
 277
 278         h->num_buckets = num_buckets;
 279         h->bucket_bitmask = h->num_buckets - 1;
 280         h->buckets = buckets;
 281         h->hash_func = (params->hash_func == NULL) ?
 282                 DEFAULT_HASH_FUNC : params->hash_func;
 283         h->key_store = k;
 284         h->free_slots = r;
 285         h->hw_trans_mem_support = hw_trans_mem_support;
 286
 287 #if defined(RTE_ARCH_X86)
 288         if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2))
 289                 h->sig_cmp_fn = RTE_HASH_COMPARE_AVX2;
 290         else if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE2))
 291                 h->sig_cmp_fn = RTE_HASH_COMPARE_SSE;
 292         else
 293 #endif
 294                 h->sig_cmp_fn = RTE_HASH_COMPARE_SCALAR;
 295
 296         /* Turn on multi-writer only with explicit flat from user and TM
 297          * support.
 298          */
 299         if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD) {
 300                 if (h->hw_trans_mem_support) {
 301                         h->add_key = ADD_KEY_MULTIWRITER_TM;
 302                 } else {
 303                         h->add_key = ADD_KEY_MULTIWRITER;
 304                         h->multiwriter_lock = rte_malloc(NULL,
 305                                                         sizeof(rte_spinlock_t),
 306                                                         LCORE_CACHE_SIZE);
 307                         rte_spinlock_init(h->multiwriter_lock);
 308                 }
 309         } else
 310                 h->add_key = ADD_KEY_SINGLEWRITER;
 311
 312         /* Populate free slots ring. Entry zero is reserved for key misses. */
 313         for (i = 1; i < params->entries + 1; i++)
 314                 rte_ring_sp_enqueue(r, (void *)((uintptr_t) i));
 315
 316         te->data = (void *) h;
 317         TAILQ_INSERT_TAIL(hash_list, te, next);
 318         rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
 319
 320         return h;
 321 err_unlock:
 322         rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
 323 err:
 324         rte_ring_free(r);
 325         rte_free(te);
 326         rte_free(h);
 327         rte_free(buckets);
 328         rte_free(k);
 329         return NULL;
 330 }
 331
 332 void
 333 rte_hash_free(struct rte_hash *h)
 334 {
 335         struct rte_tailq_entry *te;
 336         struct rte_hash_list *hash_list;
 337
 338         if (h == NULL)
 339                 return;
 340
 341         hash_list = RTE_TAILQ_CAST(rte_hash_tailq.head, rte_hash_list);
 342
 343         rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
 344
 345         /* find out tailq entry */
 346         TAILQ_FOREACH(te, hash_list, next) {
 347                 if (te->data == (void *) h)
 348                         break;
 349         }
 350
 351         if (te == NULL) {
 352                 rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
 353                 return;
 354         }
 355
 356         TAILQ_REMOVE(hash_list, te, next);
 357
 358         rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
 359
 360         if (h->hw_trans_mem_support)
 361                 rte_free(h->local_free_slots);
 362
 363         if (h->add_key == ADD_KEY_MULTIWRITER)
 364                 rte_free(h->multiwriter_lock);
 365         rte_ring_free(h->free_slots);
 366         rte_free(h->key_store);
 367         rte_free(h->buckets);
 368         rte_free(h);
 369         rte_free(te);
 370 }
 371
 372 hash_sig_t
 373 rte_hash_hash(const struct rte_hash *h, const void *key)
 374 {
 375         /* calc hash result by key */
 376         return h->hash_func(key, h->key_len, h->hash_func_init_val);
 377 }
 378
 379 /* Calc the secondary hash value from the primary hash value of a given key */
 380 static inline hash_sig_t
 381 rte_hash_secondary_hash(const hash_sig_t primary_hash)
 382 {
 383         static const unsigned all_bits_shift = 12;
 384         static const unsigned alt_bits_xor = 0x5bd1e995;
 385
 386         uint32_t tag = primary_hash >> all_bits_shift;
 387
 388         return primary_hash ^ ((tag + 1) * alt_bits_xor);
 389 }
 390
 391 void
 392 rte_hash_reset(struct rte_hash *h)
 393 {
 394         void *ptr;
 395         unsigned i;
 396
 397         if (h == NULL)
 398                 return;
 399
 400         memset(h->buckets, 0, h->num_buckets * sizeof(struct rte_hash_bucket));
 401         memset(h->key_store, 0, h->key_entry_size * (h->entries + 1));
 402
 403         /* clear the free ring */
 404         while (rte_ring_dequeue(h->free_slots, &ptr) == 0)
 405                 rte_pause();
 406
 407         /* Repopulate the free slots ring. Entry zero is reserved for key misses */
 408         for (i = 1; i < h->entries + 1; i++)
 409                 rte_ring_sp_enqueue(h->free_slots, (void *)((uintptr_t) i));
 410
 411         if (h->hw_trans_mem_support) {
 412                 /* Reset local caches per lcore */
 413                 for (i = 0; i < RTE_MAX_LCORE; i++)
 414                         h->local_free_slots[i].len = 0;
 415         }
 416 }
 417
 418 /* Search for an entry that can be pushed to its alternative location */
 419 static inline int
 420 make_space_bucket(const struct rte_hash *h, struct rte_hash_bucket *bkt)
 421 {
 422         static unsigned int nr_pushes;
 423         unsigned i, j;
 424         int ret;
 425         uint32_t next_bucket_idx;
 426         struct rte_hash_bucket *next_bkt[RTE_HASH_BUCKET_ENTRIES];
 427
 428         /*
 429          * Push existing item (search for bucket with space in
 430          * alternative locations) to its alternative location
 431          */
 432         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 433                 /* Search for space in alternative locations */
 434                 next_bucket_idx = bkt->sig_alt[i] & h->bucket_bitmask;
 435                 next_bkt[i] = &h->buckets[next_bucket_idx];
 436                 for (j = 0; j < RTE_HASH_BUCKET_ENTRIES; j++) {
 437                         if (next_bkt[i]->key_idx[j] == EMPTY_SLOT)
 438                                 break;
 439                 }
 440
 441                 if (j != RTE_HASH_BUCKET_ENTRIES)
 442                         break;
 443         }
 444
 445         /* Alternative location has spare room (end of recursive function) */
 446         if (i != RTE_HASH_BUCKET_ENTRIES) {
 447                 next_bkt[i]->sig_alt[j] = bkt->sig_current[i];
 448                 next_bkt[i]->sig_current[j] = bkt->sig_alt[i];
 449                 next_bkt[i]->key_idx[j] = bkt->key_idx[i];
 450                 return i;
 451         }
 452
 453         /* Pick entry that has not been pushed yet */
 454         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++)
 455                 if (bkt->flag[i] == 0)
 456                         break;
 457
 458         /* All entries have been pushed, so entry cannot be added */
 459         if (i == RTE_HASH_BUCKET_ENTRIES || nr_pushes > RTE_HASH_MAX_PUSHES)
 460                 return -ENOSPC;
 461
 462         /* Set flag to indicate that this entry is going to be pushed */
 463         bkt->flag[i] = 1;
 464
 465         nr_pushes++;
 466         /* Need room in alternative bucket to insert the pushed entry */
 467         ret = make_space_bucket(h, next_bkt[i]);
 468         /*
 469          * After recursive function.
 470          * Clear flags and insert the pushed entry
 471          * in its alternative location if successful,
 472          * or return error
 473          */
 474         bkt->flag[i] = 0;
 475         nr_pushes = 0;
 476         if (ret >= 0) {
 477                 next_bkt[i]->sig_alt[ret] = bkt->sig_current[i];
 478                 next_bkt[i]->sig_current[ret] = bkt->sig_alt[i];
 479                 next_bkt[i]->key_idx[ret] = bkt->key_idx[i];
 480                 return i;
 481         } else
 482                 return ret;
 483
 484 }
 485
 486 /*
 487  * Function called to enqueue back an index in the cache/ring,
 488  * as slot has not being used and it can be used in the
 489  * next addition attempt.
 490  */
 491 static inline void
 492 enqueue_slot_back(const struct rte_hash *h,
 493                 struct lcore_cache *cached_free_slots,
 494                 void *slot_id)
 495 {
 496         if (h->hw_trans_mem_support) {
 497                 cached_free_slots->objs[cached_free_slots->len] = slot_id;
 498                 cached_free_slots->len++;
 499         } else
 500                 rte_ring_sp_enqueue(h->free_slots, slot_id);
 501 }
 502
 503 static inline int32_t
 504 __rte_hash_add_key_with_hash(const struct rte_hash *h, const void *key,
 505                                                 hash_sig_t sig, void *data)
 506 {
 507         hash_sig_t alt_hash;
 508         uint32_t prim_bucket_idx, sec_bucket_idx;
 509         unsigned i;
 510         struct rte_hash_bucket *prim_bkt, *sec_bkt;
 511         struct rte_hash_key *new_k, *k, *keys = h->key_store;
 512         void *slot_id = NULL;
 513         uint32_t new_idx;
 514         int ret;
 515         unsigned n_slots;
 516         unsigned lcore_id;
 517         struct lcore_cache *cached_free_slots = NULL;
 518
 519         if (h->add_key == ADD_KEY_MULTIWRITER)
 520                 rte_spinlock_lock(h->multiwriter_lock);
 521
 522         prim_bucket_idx = sig & h->bucket_bitmask;
 523         prim_bkt = &h->buckets[prim_bucket_idx];
 524         rte_prefetch0(prim_bkt);
 525
 526         alt_hash = rte_hash_secondary_hash(sig);
 527         sec_bucket_idx = alt_hash & h->bucket_bitmask;
 528         sec_bkt = &h->buckets[sec_bucket_idx];
 529         rte_prefetch0(sec_bkt);
 530
 531         /* Get a new slot for storing the new key */
 532         if (h->hw_trans_mem_support) {
 533                 lcore_id = rte_lcore_id();
 534                 cached_free_slots = &h->local_free_slots[lcore_id];
 535                 /* Try to get a free slot from the local cache */
 536                 if (cached_free_slots->len == 0) {
 537                         /* Need to get another burst of free slots from global ring */
 538                         n_slots = rte_ring_mc_dequeue_burst(h->free_slots,
 539                                         cached_free_slots->objs, LCORE_CACHE_SIZE);
 540                         if (n_slots == 0)
 541                                 return -ENOSPC;
 542
 543                         cached_free_slots->len += n_slots;
 544                 }
 545
 546                 /* Get a free slot from the local cache */
 547                 cached_free_slots->len--;
 548                 slot_id = cached_free_slots->objs[cached_free_slots->len];
 549         } else {
 550                 if (rte_ring_sc_dequeue(h->free_slots, &slot_id) != 0)
 551                         return -ENOSPC;
 552         }
 553
 554         new_k = RTE_PTR_ADD(keys, (uintptr_t)slot_id * h->key_entry_size);
 555         rte_prefetch0(new_k);
 556         new_idx = (uint32_t)((uintptr_t) slot_id);
 557
 558         /* Check if key is already inserted in primary location */
 559         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 560                 if (prim_bkt->sig_current[i] == sig &&
 561                                 prim_bkt->sig_alt[i] == alt_hash) {
 562                         k = (struct rte_hash_key *) ((char *)keys +
 563                                         prim_bkt->key_idx[i] * h->key_entry_size);
 564                         if (rte_hash_cmp_eq(key, k->key, h) == 0) {
 565                                 /* Enqueue index of free slot back in the ring. */
 566                                 enqueue_slot_back(h, cached_free_slots, slot_id);
 567                                 /* Update data */
 568                                 k->pdata = data;
 569                                 /*
 570                                  * Return index where key is stored,
 571                                  * substracting the first dummy index
 572                                  */
 573                                 return prim_bkt->key_idx[i] - 1;
 574                         }
 575                 }
 576         }
 577
 578         /* Check if key is already inserted in secondary location */
 579         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 580                 if (sec_bkt->sig_alt[i] == sig &&
 581                                 sec_bkt->sig_current[i] == alt_hash) {
 582                         k = (struct rte_hash_key *) ((char *)keys +
 583                                         sec_bkt->key_idx[i] * h->key_entry_size);
 584                         if (rte_hash_cmp_eq(key, k->key, h) == 0) {
 585                                 /* Enqueue index of free slot back in the ring. */
 586                                 enqueue_slot_back(h, cached_free_slots, slot_id);
 587                                 /* Update data */
 588                                 k->pdata = data;
 589                                 /*
 590                                  * Return index where key is stored,
 591                                  * substracting the first dummy index
 592                                  */
 593                                 return sec_bkt->key_idx[i] - 1;
 594                         }
 595                 }
 596         }
 597
 598         /* Copy key */
 599         rte_memcpy(new_k->key, key, h->key_len);
 600         new_k->pdata = data;
 601
 602 #if defined(RTE_ARCH_X86) /* currently only x86 support HTM */
 603         if (h->add_key == ADD_KEY_MULTIWRITER_TM) {
 604                 ret = rte_hash_cuckoo_insert_mw_tm(prim_bkt,
 605                                 sig, alt_hash, new_idx);
 606                 if (ret >= 0)
 607                         return new_idx - 1;
 608
 609                 /* Primary bucket full, need to make space for new entry */
 610                 ret = rte_hash_cuckoo_make_space_mw_tm(h, prim_bkt, sig,
 611                                                         alt_hash, new_idx);
 612
 613                 if (ret >= 0)
 614                         return new_idx - 1;
 615
 616                 /* Also search secondary bucket to get better occupancy */
 617                 ret = rte_hash_cuckoo_make_space_mw_tm(h, sec_bkt, sig,
 618                                                         alt_hash, new_idx);
 619
 620                 if (ret >= 0)
 621                         return new_idx - 1;
 622         } else {
 623 #endif
 624                 for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 625                         /* Check if slot is available */
 626                         if (likely(prim_bkt->key_idx[i] == EMPTY_SLOT)) {
 627                                 prim_bkt->sig_current[i] = sig;
 628                                 prim_bkt->sig_alt[i] = alt_hash;
 629                                 prim_bkt->key_idx[i] = new_idx;
 630                                 break;
 631                         }
 632                 }
 633
 634                 if (i != RTE_HASH_BUCKET_ENTRIES) {
 635                         if (h->add_key == ADD_KEY_MULTIWRITER)
 636                                 rte_spinlock_unlock(h->multiwriter_lock);
 637                         return new_idx - 1;
 638                 }
 639
 640                 /* Primary bucket full, need to make space for new entry
 641                  * After recursive function.
 642                  * Insert the new entry in the position of the pushed entry
 643                  * if successful or return error and
 644                  * store the new slot back in the ring
 645                  */
 646                 ret = make_space_bucket(h, prim_bkt);
 647                 if (ret >= 0) {
 648                         prim_bkt->sig_current[ret] = sig;
 649                         prim_bkt->sig_alt[ret] = alt_hash;
 650                         prim_bkt->key_idx[ret] = new_idx;
 651                         if (h->add_key == ADD_KEY_MULTIWRITER)
 652                                 rte_spinlock_unlock(h->multiwriter_lock);
 653                         return new_idx - 1;
 654                 }
 655 #if defined(RTE_ARCH_X86)
 656         }
 657 #endif
 658         /* Error in addition, store new slot back in the ring and return error */
 659         enqueue_slot_back(h, cached_free_slots, (void *)((uintptr_t) new_idx));
 660
 661         if (h->add_key == ADD_KEY_MULTIWRITER)
 662                 rte_spinlock_unlock(h->multiwriter_lock);
 663         return ret;
 664 }
 665
 666 int32_t
 667 rte_hash_add_key_with_hash(const struct rte_hash *h,
 668                         const void *key, hash_sig_t sig)
 669 {
 670         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 671         return __rte_hash_add_key_with_hash(h, key, sig, 0);
 672 }
 673
 674 int32_t
 675 rte_hash_add_key(const struct rte_hash *h, const void *key)
 676 {
 677         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 678         return __rte_hash_add_key_with_hash(h, key, rte_hash_hash(h, key), 0);
 679 }
 680
 681 int
 682 rte_hash_add_key_with_hash_data(const struct rte_hash *h,
 683                         const void *key, hash_sig_t sig, void *data)
 684 {
 685         int ret;
 686
 687         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 688         ret = __rte_hash_add_key_with_hash(h, key, sig, data);
 689         if (ret >= 0)
 690                 return 0;
 691         else
 692                 return ret;
 693 }
 694
 695 int
 696 rte_hash_add_key_data(const struct rte_hash *h, const void *key, void *data)
 697 {
 698         int ret;
 699
 700         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 701
 702         ret = __rte_hash_add_key_with_hash(h, key, rte_hash_hash(h, key), data);
 703         if (ret >= 0)
 704                 return 0;
 705         else
 706                 return ret;
 707 }
 708 static inline int32_t
 709 __rte_hash_lookup_with_hash(const struct rte_hash *h, const void *key,
 710                                         hash_sig_t sig, void **data)
 711 {
 712         uint32_t bucket_idx;
 713         hash_sig_t alt_hash;
 714         unsigned i;
 715         struct rte_hash_bucket *bkt;
 716         struct rte_hash_key *k, *keys = h->key_store;
 717
 718         bucket_idx = sig & h->bucket_bitmask;
 719         bkt = &h->buckets[bucket_idx];
 720
 721         /* Check if key is in primary location */
 722         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 723                 if (bkt->sig_current[i] == sig &&
 724                                 bkt->key_idx[i] != EMPTY_SLOT) {
 725                         k = (struct rte_hash_key *) ((char *)keys +
 726                                         bkt->key_idx[i] * h->key_entry_size);
 727                         if (rte_hash_cmp_eq(key, k->key, h) == 0) {
 728                                 if (data != NULL)
 729                                         *data = k->pdata;
 730                                 /*
 731                                  * Return index where key is stored,
 732                                  * substracting the first dummy index
 733                                  */
 734                                 return bkt->key_idx[i] - 1;
 735                         }
 736                 }
 737         }
 738
 739         /* Calculate secondary hash */
 740         alt_hash = rte_hash_secondary_hash(sig);
 741         bucket_idx = alt_hash & h->bucket_bitmask;
 742         bkt = &h->buckets[bucket_idx];
 743
 744         /* Check if key is in secondary location */
 745         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 746                 if (bkt->sig_current[i] == alt_hash &&
 747                                 bkt->sig_alt[i] == sig) {
 748                         k = (struct rte_hash_key *) ((char *)keys +
 749                                         bkt->key_idx[i] * h->key_entry_size);
 750                         if (rte_hash_cmp_eq(key, k->key, h) == 0) {
 751                                 if (data != NULL)
 752                                         *data = k->pdata;
 753                                 /*
 754                                  * Return index where key is stored,
 755                                  * substracting the first dummy index
 756                                  */
 757                                 return bkt->key_idx[i] - 1;
 758                         }
 759                 }
 760         }
 761
 762         return -ENOENT;
 763 }
 764
 765 int32_t
 766 rte_hash_lookup_with_hash(const struct rte_hash *h,
 767                         const void *key, hash_sig_t sig)
 768 {
 769         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 770         return __rte_hash_lookup_with_hash(h, key, sig, NULL);
 771 }
 772
 773 int32_t
 774 rte_hash_lookup(const struct rte_hash *h, const void *key)
 775 {
 776         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 777         return __rte_hash_lookup_with_hash(h, key, rte_hash_hash(h, key), NULL);
 778 }
 779
 780 int
 781 rte_hash_lookup_with_hash_data(const struct rte_hash *h,
 782                         const void *key, hash_sig_t sig, void **data)
 783 {
 784         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 785         return __rte_hash_lookup_with_hash(h, key, sig, data);
 786 }
 787
 788 int
 789 rte_hash_lookup_data(const struct rte_hash *h, const void *key, void **data)
 790 {
 791         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 792         return __rte_hash_lookup_with_hash(h, key, rte_hash_hash(h, key), data);
 793 }
 794
 795 static inline void
 796 remove_entry(const struct rte_hash *h, struct rte_hash_bucket *bkt, unsigned i)
 797 {
 798         unsigned lcore_id, n_slots;
 799         struct lcore_cache *cached_free_slots;
 800
 801         bkt->sig_current[i] = NULL_SIGNATURE;
 802         bkt->sig_alt[i] = NULL_SIGNATURE;
 803         if (h->hw_trans_mem_support) {
 804                 lcore_id = rte_lcore_id();
 805                 cached_free_slots = &h->local_free_slots[lcore_id];
 806                 /* Cache full, need to free it. */
 807                 if (cached_free_slots->len == LCORE_CACHE_SIZE) {
 808                         /* Need to enqueue the free slots in global ring. */
 809                         n_slots = rte_ring_mp_enqueue_burst(h->free_slots,
 810                                                 cached_free_slots->objs,
 811                                                 LCORE_CACHE_SIZE);
 812                         cached_free_slots->len -= n_slots;
 813                 }
 814                 /* Put index of new free slot in cache. */
 815                 cached_free_slots->objs[cached_free_slots->len] =
 816                                 (void *)((uintptr_t)bkt->key_idx[i]);
 817                 cached_free_slots->len++;
 818         } else {
 819                 rte_ring_sp_enqueue(h->free_slots,
 820                                 (void *)((uintptr_t)bkt->key_idx[i]));
 821         }
 822 }
 823
 824 static inline int32_t
 825 __rte_hash_del_key_with_hash(const struct rte_hash *h, const void *key,
 826                                                 hash_sig_t sig)
 827 {
 828         uint32_t bucket_idx;
 829         hash_sig_t alt_hash;
 830         unsigned i;
 831         struct rte_hash_bucket *bkt;
 832         struct rte_hash_key *k, *keys = h->key_store;
 833         int32_t ret;
 834
 835         bucket_idx = sig & h->bucket_bitmask;
 836         bkt = &h->buckets[bucket_idx];
 837
 838         /* Check if key is in primary location */
 839         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 840                 if (bkt->sig_current[i] == sig &&
 841                                 bkt->key_idx[i] != EMPTY_SLOT) {
 842                         k = (struct rte_hash_key *) ((char *)keys +
 843                                         bkt->key_idx[i] * h->key_entry_size);
 844                         if (rte_hash_cmp_eq(key, k->key, h) == 0) {
 845                                 remove_entry(h, bkt, i);
 846
 847                                 /*
 848                                  * Return index where key is stored,
 849                                  * substracting the first dummy index
 850                                  */
 851                                 ret = bkt->key_idx[i] - 1;
 852                                 bkt->key_idx[i] = EMPTY_SLOT;
 853                                 return ret;
 854                         }
 855                 }
 856         }
 857
 858         /* Calculate secondary hash */
 859         alt_hash = rte_hash_secondary_hash(sig);
 860         bucket_idx = alt_hash & h->bucket_bitmask;
 861         bkt = &h->buckets[bucket_idx];
 862
 863         /* Check if key is in secondary location */
 864         for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 865                 if (bkt->sig_current[i] == alt_hash &&
 866                                 bkt->key_idx[i] != EMPTY_SLOT) {
 867                         k = (struct rte_hash_key *) ((char *)keys +
 868                                         bkt->key_idx[i] * h->key_entry_size);
 869                         if (rte_hash_cmp_eq(key, k->key, h) == 0) {
 870                                 remove_entry(h, bkt, i);
 871
 872                                 /*
 873                                  * Return index where key is stored,
 874                                  * substracting the first dummy index
 875                                  */
 876                                 ret = bkt->key_idx[i] - 1;
 877                                 bkt->key_idx[i] = EMPTY_SLOT;
 878                                 return ret;
 879                         }
 880                 }
 881         }
 882
 883         return -ENOENT;
 884 }
 885
 886 int32_t
 887 rte_hash_del_key_with_hash(const struct rte_hash *h,
 888                         const void *key, hash_sig_t sig)
 889 {
 890         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 891         return __rte_hash_del_key_with_hash(h, key, sig);
 892 }
 893
 894 int32_t
 895 rte_hash_del_key(const struct rte_hash *h, const void *key)
 896 {
 897         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 898         return __rte_hash_del_key_with_hash(h, key, rte_hash_hash(h, key));
 899 }
 900
 901 int
 902 rte_hash_get_key_with_position(const struct rte_hash *h, const int32_t position,
 903                                void **key)
 904 {
 905         RETURN_IF_TRUE(((h == NULL) || (key == NULL)), -EINVAL);
 906
 907         struct rte_hash_key *k, *keys = h->key_store;
 908         k = (struct rte_hash_key *) ((char *) keys + (position + 1) *
 909                                      h->key_entry_size);
 910         *key = k->key;
 911
 912         if (position !=
 913             __rte_hash_lookup_with_hash(h, *key, rte_hash_hash(h, *key),
 914                                         NULL)) {
 915                 return -ENOENT;
 916         }
 917
 918         return 0;
 919 }
 920
 921 static inline void
 922 compare_signatures(uint32_t *prim_hash_matches, uint32_t *sec_hash_matches,
 923                         const struct rte_hash_bucket *prim_bkt,
 924                         const struct rte_hash_bucket *sec_bkt,
 925                         hash_sig_t prim_hash, hash_sig_t sec_hash,
 926                         enum rte_hash_sig_compare_function sig_cmp_fn)
 927 {
 928         unsigned int i;
 929
 930         switch (sig_cmp_fn) {
 931 #ifdef RTE_MACHINE_CPUFLAG_AVX2
 932         case RTE_HASH_COMPARE_AVX2:
 933                 *prim_hash_matches = _mm256_movemask_ps((__m256)_mm256_cmpeq_epi32(
 934                                 _mm256_load_si256(
 935                                         (__m256i const *)prim_bkt->sig_current),
 936                                 _mm256_set1_epi32(prim_hash)));
 937                 *sec_hash_matches = _mm256_movemask_ps((__m256)_mm256_cmpeq_epi32(
 938                                 _mm256_load_si256(
 939                                         (__m256i const *)sec_bkt->sig_current),
 940                                 _mm256_set1_epi32(sec_hash)));
 941                 break;
 942 #endif
 943 #ifdef RTE_MACHINE_CPUFLAG_SSE2
 944         case RTE_HASH_COMPARE_SSE:
 945                 /* Compare the first 4 signatures in the bucket */
 946                 *prim_hash_matches = _mm_movemask_ps((__m128)_mm_cmpeq_epi16(
 947                                 _mm_load_si128(
 948                                         (__m128i const *)prim_bkt->sig_current),
 949                                 _mm_set1_epi32(prim_hash)));
 950                 *prim_hash_matches |= (_mm_movemask_ps((__m128)_mm_cmpeq_epi16(
 951                                 _mm_load_si128(
 952                                         (__m128i const *)&prim_bkt->sig_current[4]),
 953                                 _mm_set1_epi32(prim_hash)))) << 4;
 954                 /* Compare the first 4 signatures in the bucket */
 955                 *sec_hash_matches = _mm_movemask_ps((__m128)_mm_cmpeq_epi16(
 956                                 _mm_load_si128(
 957                                         (__m128i const *)sec_bkt->sig_current),
 958                                 _mm_set1_epi32(sec_hash)));
 959                 *sec_hash_matches |= (_mm_movemask_ps((__m128)_mm_cmpeq_epi16(
 960                                 _mm_load_si128(
 961                                         (__m128i const *)&sec_bkt->sig_current[4]),
 962                                 _mm_set1_epi32(sec_hash)))) << 4;
 963                 break;
 964 #endif
 965         default:
 966                 for (i = 0; i < RTE_HASH_BUCKET_ENTRIES; i++) {
 967                         *prim_hash_matches |=
 968                                 ((prim_hash == prim_bkt->sig_current[i]) << i);
 969                         *sec_hash_matches |=
 970                                 ((sec_hash == sec_bkt->sig_current[i]) << i);
 971                 }
 972         }
 973
 974 }
 975
 976 #define PREFETCH_OFFSET 4
 977 static inline void
 978 __rte_hash_lookup_bulk(const struct rte_hash *h, const void **keys,
 979                         int32_t num_keys, int32_t *positions,
 980                         uint64_t *hit_mask, void *data[])
 981 {
 982         uint64_t hits = 0;
 983         int32_t i;
 984         uint32_t prim_hash[RTE_HASH_LOOKUP_BULK_MAX];
 985         uint32_t sec_hash[RTE_HASH_LOOKUP_BULK_MAX];
 986         const struct rte_hash_bucket *primary_bkt[RTE_HASH_LOOKUP_BULK_MAX];
 987         const struct rte_hash_bucket *secondary_bkt[RTE_HASH_LOOKUP_BULK_MAX];
 988         uint32_t prim_hitmask[RTE_HASH_LOOKUP_BULK_MAX] = {0};
 989         uint32_t sec_hitmask[RTE_HASH_LOOKUP_BULK_MAX] = {0};
 990
 991         /* Prefetch first keys */
 992         for (i = 0; i < PREFETCH_OFFSET && i < num_keys; i++)
 993                 rte_prefetch0(keys[i]);
 994
 995         /*
 996          * Prefetch rest of the keys, calculate primary and
 997          * secondary bucket and prefetch them
 998          */
 999         for (i = 0; i < (num_keys - PREFETCH_OFFSET); i++) {
1000                 rte_prefetch0(keys[i + PREFETCH_OFFSET]);
1001
1002                 prim_hash[i] = rte_hash_hash(h, keys[i]);
1003                 sec_hash[i] = rte_hash_secondary_hash(prim_hash[i]);
1004
1005                 primary_bkt[i] = &h->buckets[prim_hash[i] & h->bucket_bitmask];
1006                 secondary_bkt[i] = &h->buckets[sec_hash[i] & h->bucket_bitmask];
1007
1008                 rte_prefetch0(primary_bkt[i]);
1009                 rte_prefetch0(secondary_bkt[i]);
1010         }
1011
1012         /* Calculate and prefetch rest of the buckets */
1013         for (; i < num_keys; i++) {
1014                 prim_hash[i] = rte_hash_hash(h, keys[i]);
1015                 sec_hash[i] = rte_hash_secondary_hash(prim_hash[i]);
1016
1017                 primary_bkt[i] = &h->buckets[prim_hash[i] & h->bucket_bitmask];
1018                 secondary_bkt[i] = &h->buckets[sec_hash[i] & h->bucket_bitmask];
1019
1020                 rte_prefetch0(primary_bkt[i]);
1021                 rte_prefetch0(secondary_bkt[i]);
1022         }
1023
1024         /* Compare signatures and prefetch key slot of first hit */
1025         for (i = 0; i < num_keys; i++) {
1026                 compare_signatures(&prim_hitmask[i], &sec_hitmask[i],
1027                                 primary_bkt[i], secondary_bkt[i],
1028                                 prim_hash[i], sec_hash[i], h->sig_cmp_fn);
1029
1030                 if (prim_hitmask[i]) {
1031                         uint32_t first_hit = __builtin_ctzl(prim_hitmask[i]);
1032                         uint32_t key_idx = primary_bkt[i]->key_idx[first_hit];
1033                         const struct rte_hash_key *key_slot =
1034                                 (const struct rte_hash_key *)(
1035                                 (const char *)h->key_store +
1036                                 key_idx * h->key_entry_size);
1037                         rte_prefetch0(key_slot);
1038                         continue;
1039                 }
1040
1041                 if (sec_hitmask[i]) {
1042                         uint32_t first_hit = __builtin_ctzl(sec_hitmask[i]);
1043                         uint32_t key_idx = secondary_bkt[i]->key_idx[first_hit];
1044                         const struct rte_hash_key *key_slot =
1045                                 (const struct rte_hash_key *)(
1046                                 (const char *)h->key_store +
1047                                 key_idx * h->key_entry_size);
1048                         rte_prefetch0(key_slot);
1049                 }
1050         }
1051
1052         /* Compare keys, first hits in primary first */
1053         for (i = 0; i < num_keys; i++) {
1054                 positions[i] = -ENOENT;
1055                 while (prim_hitmask[i]) {
1056                         uint32_t hit_index = __builtin_ctzl(prim_hitmask[i]);
1057
1058                         uint32_t key_idx = primary_bkt[i]->key_idx[hit_index];
1059                         const struct rte_hash_key *key_slot =
1060                                 (const struct rte_hash_key *)(
1061                                 (const char *)h->key_store +
1062                                 key_idx * h->key_entry_size);
1063                         /*
1064                          * If key index is 0, do not compare key,
1065                          * as it is checking the dummy slot
1066                          */
1067                         if (!!key_idx & !rte_hash_cmp_eq(key_slot->key, keys[i], h)) {
1068                                 if (data != NULL)
1069                                         data[i] = key_slot->pdata;
1070
1071                                 hits |= 1ULL << i;
1072                                 positions[i] = key_idx - 1;
1073                                 goto next_key;
1074                         }
1075                         prim_hitmask[i] &= ~(1 << (hit_index));
1076                 }
1077
1078                 while (sec_hitmask[i]) {
1079                         uint32_t hit_index = __builtin_ctzl(sec_hitmask[i]);
1080
1081                         uint32_t key_idx = secondary_bkt[i]->key_idx[hit_index];
1082                         const struct rte_hash_key *key_slot =
1083                                 (const struct rte_hash_key *)(
1084                                 (const char *)h->key_store +
1085                                 key_idx * h->key_entry_size);
1086                         /*
1087                          * If key index is 0, do not compare key,
1088                          * as it is checking the dummy slot
1089                          */
1090
1091                         if (!!key_idx & !rte_hash_cmp_eq(key_slot->key, keys[i], h)) {
1092                                 if (data != NULL)
1093                                         data[i] = key_slot->pdata;
1094
1095                                 hits |= 1ULL << i;
1096                                 positions[i] = key_idx - 1;
1097                                 goto next_key;
1098                         }
1099                         sec_hitmask[i] &= ~(1 << (hit_index));
1100                 }
1101
1102 next_key:
1103                 continue;
1104         }
1105
1106         if (hit_mask != NULL)
1107                 *hit_mask = hits;
1108 }
1109
1110 int
1111 rte_hash_lookup_bulk(const struct rte_hash *h, const void **keys,
1112                       uint32_t num_keys, int32_t *positions)
1113 {
1114         RETURN_IF_TRUE(((h == NULL) || (keys == NULL) || (num_keys == 0) ||
1115                         (num_keys > RTE_HASH_LOOKUP_BULK_MAX) ||
1116                         (positions == NULL)), -EINVAL);
1117
1118         __rte_hash_lookup_bulk(h, keys, num_keys, positions, NULL, NULL);
1119         return 0;
1120 }
1121
1122 int
1123 rte_hash_lookup_bulk_data(const struct rte_hash *h, const void **keys,
1124                       uint32_t num_keys, uint64_t *hit_mask, void *data[])
1125 {
1126         RETURN_IF_TRUE(((h == NULL) || (keys == NULL) || (num_keys == 0) ||
1127                         (num_keys > RTE_HASH_LOOKUP_BULK_MAX) ||
1128                         (hit_mask == NULL)), -EINVAL);
1129
1130         int32_t positions[num_keys];
1131
1132         __rte_hash_lookup_bulk(h, keys, num_keys, positions, hit_mask, data);
1133
1134         /* Return number of hits */
1135         return __builtin_popcountl(*hit_mask);
1136 }
1137
1138 int32_t
1139 rte_hash_iterate(const struct rte_hash *h, const void **key, void **data, uint32_t *next)
1140 {
1141         uint32_t bucket_idx, idx, position;
1142         struct rte_hash_key *next_key;
1143
1144         RETURN_IF_TRUE(((h == NULL) || (next == NULL)), -EINVAL);
1145
1146         const uint32_t total_entries = h->num_buckets * RTE_HASH_BUCKET_ENTRIES;
1147         /* Out of bounds */
1148         if (*next >= total_entries)
1149                 return -ENOENT;
1150
1151         /* Calculate bucket and index of current iterator */
1152         bucket_idx = *next / RTE_HASH_BUCKET_ENTRIES;
1153         idx = *next % RTE_HASH_BUCKET_ENTRIES;
1154
1155         /* If current position is empty, go to the next one */
1156         while (h->buckets[bucket_idx].key_idx[idx] == EMPTY_SLOT) {
1157                 (*next)++;
1158                 /* End of table */
1159                 if (*next == total_entries)
1160                         return -ENOENT;
1161                 bucket_idx = *next / RTE_HASH_BUCKET_ENTRIES;
1162                 idx = *next % RTE_HASH_BUCKET_ENTRIES;
1163         }
1164
1165         /* Get position of entry in key table */
1166         position = h->buckets[bucket_idx].key_idx[idx];
1167         next_key = (struct rte_hash_key *) ((char *)h->key_store +
1168                                 position * h->key_entry_size);
1169         /* Return key and data */
1170         *key = next_key->key;
1171         *data = next_key->pdata;
1172
1173         /* Increment iterator */
1174         (*next)++;
1175
1176         return position - 1;
1177 }