FD.io VPP  v17.10-9-gd594711
Vector Packet Processing
bihash_template.c
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 /** @cond DOCUMENTATION_IS_IN_BIHASH_DOC_H */
17 
18 void BV (clib_bihash_init)
19  (BVT (clib_bihash) * h, char *name, u32 nbuckets, uword memory_size)
20 {
21  void *oldheap;
22  int i;
23 
24  nbuckets = 1 << (max_log2 (nbuckets));
25 
26  h->name = (u8 *) name;
27  h->nbuckets = nbuckets;
28  h->log2_nbuckets = max_log2 (nbuckets);
29  h->cache_hits = 0;
30  h->cache_misses = 0;
31 
32  h->mheap = mheap_alloc (0 /* use VM */ , memory_size);
33 
34  oldheap = clib_mem_set_heap (h->mheap);
35  vec_validate_aligned (h->buckets, nbuckets - 1, CLIB_CACHE_LINE_BYTES);
38  h->writer_lock[0] = 0;
39 
40  for (i = 0; i < nbuckets; i++)
41  BV (clib_bihash_reset_cache) (h->buckets + i);
42 
43  clib_mem_set_heap (oldheap);
44 }
45 
46 void BV (clib_bihash_free) (BVT (clib_bihash) * h)
47 {
48  mheap_free (h->mheap);
49  memset (h, 0, sizeof (*h));
50 }
51 
52 static
54 BV (value_alloc) (BVT (clib_bihash) * h, u32 log2_pages)
55 {
56  BVT (clib_bihash_value) * rv = 0;
57  void *oldheap;
58 
59  ASSERT (h->writer_lock[0]);
60  if (log2_pages >= vec_len (h->freelists) || h->freelists[log2_pages] == 0)
61  {
62  oldheap = clib_mem_set_heap (h->mheap);
63 
64  vec_validate (h->freelists, log2_pages);
65  rv = clib_mem_alloc_aligned ((sizeof (*rv) * (1 << log2_pages)),
67  clib_mem_set_heap (oldheap);
68  goto initialize;
69  }
70  rv = h->freelists[log2_pages];
71  h->freelists[log2_pages] = rv->next_free;
72 
73 initialize:
74  ASSERT (rv);
75  /*
76  * Latest gcc complains that the length arg is zero
77  * if we replace (1<<log2_pages) with vec_len(rv).
78  * No clue.
79  */
80  memset (rv, 0xff, sizeof (*rv) * (1 << log2_pages));
81  return rv;
82 }
83 
84 static void
85 BV (value_free) (BVT (clib_bihash) * h, BVT (clib_bihash_value) * v,
87 {
88  ASSERT (h->writer_lock[0]);
89 
90  ASSERT (vec_len (h->freelists) > log2_pages);
91 
92  v->next_free = h->freelists[log2_pages];
93  h->freelists[log2_pages] = v;
94 }
95 
96 static inline void
97 BV (make_working_copy) (BVT (clib_bihash) * h, BVT (clib_bihash_bucket) * b)
98 {
100  BVT (clib_bihash_bucket) working_bucket __attribute__ ((aligned (8)));
101  void *oldheap;
102  BVT (clib_bihash_value) * working_copy;
103  u32 thread_index = os_get_thread_index ();
104  int log2_working_copy_length;
105 
106  if (thread_index >= vec_len (h->working_copies))
107  {
108  oldheap = clib_mem_set_heap (h->mheap);
109  vec_validate (h->working_copies, thread_index);
110  vec_validate_init_empty (h->working_copy_lengths, thread_index, ~0);
111  clib_mem_set_heap (oldheap);
112  }
113 
114  /*
115  * working_copies are per-cpu so that near-simultaneous
116  * updates from multiple threads will not result in sporadic, spurious
117  * lookup failures.
118  */
119  working_copy = h->working_copies[thread_index];
120  log2_working_copy_length = h->working_copy_lengths[thread_index];
121 
122  h->saved_bucket.as_u64 = b->as_u64;
123  oldheap = clib_mem_set_heap (h->mheap);
124 
125  if (b->log2_pages > log2_working_copy_length)
126  {
127  if (working_copy)
128  clib_mem_free (working_copy);
129 
130  working_copy = clib_mem_alloc_aligned
131  (sizeof (working_copy[0]) * (1 << b->log2_pages),
133  h->working_copy_lengths[thread_index] = b->log2_pages;
134  h->working_copies[thread_index] = working_copy;
135  }
136 
137  clib_mem_set_heap (oldheap);
138 
139  /* Lock the bucket... */
140  while (BV (clib_bihash_lock_bucket) (b) == 0)
141  ;
142 
143  v = BV (clib_bihash_get_value) (h, b->offset);
144 
145  clib_memcpy (working_copy, v, sizeof (*v) * (1 << b->log2_pages));
146  working_bucket.as_u64 = b->as_u64;
147  working_bucket.offset = BV (clib_bihash_get_offset) (h, working_copy);
149  b->as_u64 = working_bucket.as_u64;
150  h->working_copies[thread_index] = working_copy;
151 }
152 
153 static
155 BV (split_and_rehash)
156  (BVT (clib_bihash) * h,
157  BVT (clib_bihash_value) * old_values, u32 old_log2_pages,
158  u32 new_log2_pages)
159 {
160  BVT (clib_bihash_value) * new_values, *new_v;
161  int i, j, length_in_kvs;
162 
163  new_values = BV (value_alloc) (h, new_log2_pages);
164  length_in_kvs = (1 << old_log2_pages) * BIHASH_KVP_PER_PAGE;
165 
166  for (i = 0; i < length_in_kvs; i++)
167  {
168  u64 new_hash;
169 
170  /* Entry not in use? Forget it */
171  if (BV (clib_bihash_is_free) (&(old_values->kvp[i])))
172  continue;
173 
174  /* rehash the item onto its new home-page */
175  new_hash = BV (clib_bihash_hash) (&(old_values->kvp[i]));
176  new_hash >>= h->log2_nbuckets;
177  new_hash &= (1 << new_log2_pages) - 1;
178  new_v = &new_values[new_hash];
179 
180  /* Across the new home-page */
181  for (j = 0; j < BIHASH_KVP_PER_PAGE; j++)
182  {
183  /* Empty slot */
184  if (BV (clib_bihash_is_free) (&(new_v->kvp[j])))
185  {
186  clib_memcpy (&(new_v->kvp[j]), &(old_values->kvp[i]),
187  sizeof (new_v->kvp[j]));
188  goto doublebreak;
189  }
190  }
191  /* Crap. Tell caller to try again */
192  BV (value_free) (h, new_values, new_log2_pages);
193  return 0;
194  doublebreak:;
195  }
196 
197  return new_values;
198 }
199 
200 static
203  (BVT (clib_bihash) * h,
204  BVT (clib_bihash_value) * old_values, u32 old_log2_pages,
205  u32 new_log2_pages)
206 {
207  BVT (clib_bihash_value) * new_values;
208  int i, j, new_length, old_length;
209 
210  new_values = BV (value_alloc) (h, new_log2_pages);
211  new_length = (1 << new_log2_pages) * BIHASH_KVP_PER_PAGE;
212  old_length = (1 << old_log2_pages) * BIHASH_KVP_PER_PAGE;
213 
214  j = 0;
215  /* Across the old value array */
216  for (i = 0; i < old_length; i++)
217  {
218  /* Find a free slot in the new linear scan bucket */
219  for (; j < new_length; j++)
220  {
221  /* Old value not in use? Forget it. */
222  if (BV (clib_bihash_is_free) (&(old_values->kvp[i])))
223  goto doublebreak;
224 
225  /* New value should never be in use */
226  if (BV (clib_bihash_is_free) (&(new_values->kvp[j])))
227  {
228  /* Copy the old value and move along */
229  clib_memcpy (&(new_values->kvp[j]), &(old_values->kvp[i]),
230  sizeof (new_values->kvp[j]));
231  j++;
232  goto doublebreak;
233  }
234  }
235  /* This should never happen... */
236  clib_warning ("BUG: linear rehash failed!");
237  BV (value_free) (h, new_values, new_log2_pages);
238  return 0;
239 
240  doublebreak:;
241  }
242  return new_values;
243 }
244 
245 int BV (clib_bihash_add_del)
246  (BVT (clib_bihash) * h, BVT (clib_bihash_kv) * add_v, int is_add)
247 {
248  u32 bucket_index;
249  BVT (clib_bihash_bucket) * b, tmp_b;
250  BVT (clib_bihash_value) * v, *new_v, *save_new_v, *working_copy;
251  int rv = 0;
252  int i, limit;
253  u64 hash, new_hash;
254  u32 new_log2_pages, old_log2_pages;
255  u32 thread_index = os_get_thread_index ();
256  int mark_bucket_linear;
257  int resplit_once;
258 
259  hash = BV (clib_bihash_hash) (add_v);
260 
261  bucket_index = hash & (h->nbuckets - 1);
262  b = &h->buckets[bucket_index];
263 
264  hash >>= h->log2_nbuckets;
265 
266  tmp_b.linear_search = 0;
267 
268  while (__sync_lock_test_and_set (h->writer_lock, 1))
269  ;
270 
271  /* First elt in the bucket? */
272  if (b->offset == 0)
273  {
274  if (is_add == 0)
275  {
276  rv = -1;
277  goto unlock;
278  }
279 
280  v = BV (value_alloc) (h, 0);
281 
282  *v->kvp = *add_v;
283  tmp_b.as_u64 = 0;
284  tmp_b.offset = BV (clib_bihash_get_offset) (h, v);
285 
286  b->as_u64 = tmp_b.as_u64;
287  goto unlock;
288  }
289 
290  /* Note: this leaves the cache disabled */
291  BV (make_working_copy) (h, b);
292 
293  v = BV (clib_bihash_get_value) (h, h->saved_bucket.offset);
294 
295  limit = BIHASH_KVP_PER_PAGE;
296  v += (b->linear_search == 0) ? hash & ((1 << b->log2_pages) - 1) : 0;
297  if (b->linear_search)
298  limit <<= b->log2_pages;
299 
300  if (is_add)
301  {
302  /*
303  * For obvious (in hindsight) reasons, see if we're supposed to
304  * replace an existing key, then look for an empty slot.
305  */
306  for (i = 0; i < limit; i++)
307  {
308  if (!memcmp (&(v->kvp[i]), &add_v->key, sizeof (add_v->key)))
309  {
310  clib_memcpy (&(v->kvp[i]), add_v, sizeof (*add_v));
312  /* Restore the previous (k,v) pairs */
313  b->as_u64 = h->saved_bucket.as_u64;
314  goto unlock;
315  }
316  }
317  for (i = 0; i < limit; i++)
318  {
319  if (BV (clib_bihash_is_free) (&(v->kvp[i])))
320  {
321  clib_memcpy (&(v->kvp[i]), add_v, sizeof (*add_v));
323  b->as_u64 = h->saved_bucket.as_u64;
324  goto unlock;
325  }
326  }
327  /* no room at the inn... split case... */
328  }
329  else
330  {
331  for (i = 0; i < limit; i++)
332  {
333  if (!memcmp (&(v->kvp[i]), &add_v->key, sizeof (add_v->key)))
334  {
335  memset (&(v->kvp[i]), 0xff, sizeof (*(add_v)));
337  b->as_u64 = h->saved_bucket.as_u64;
338  goto unlock;
339  }
340  }
341  rv = -3;
342  b->as_u64 = h->saved_bucket.as_u64;
343  goto unlock;
344  }
345 
346  old_log2_pages = h->saved_bucket.log2_pages;
347  new_log2_pages = old_log2_pages + 1;
348  mark_bucket_linear = 0;
349 
350  working_copy = h->working_copies[thread_index];
351  resplit_once = 0;
352 
353  new_v = BV (split_and_rehash) (h, working_copy, old_log2_pages,
354  new_log2_pages);
355  if (new_v == 0)
356  {
357  try_resplit:
358  resplit_once = 1;
359  new_log2_pages++;
360  /* Try re-splitting. If that fails, fall back to linear search */
361  new_v = BV (split_and_rehash) (h, working_copy, old_log2_pages,
362  new_log2_pages);
363  if (new_v == 0)
364  {
365  mark_linear:
366  new_log2_pages--;
367  /* pinned collisions, use linear search */
368  new_v =
369  BV (split_and_rehash_linear) (h, working_copy, old_log2_pages,
370  new_log2_pages);
371  mark_bucket_linear = 1;
372  }
373  }
374 
375  /* Try to add the new entry */
376  save_new_v = new_v;
377  new_hash = BV (clib_bihash_hash) (add_v);
378  limit = BIHASH_KVP_PER_PAGE;
379  if (mark_bucket_linear)
380  limit <<= new_log2_pages;
381  new_hash >>= h->log2_nbuckets;
382  new_hash &= (1 << new_log2_pages) - 1;
383  new_v += mark_bucket_linear ? 0 : new_hash;
384 
385  for (i = 0; i < limit; i++)
386  {
387  if (BV (clib_bihash_is_free) (&(new_v->kvp[i])))
388  {
389  clib_memcpy (&(new_v->kvp[i]), add_v, sizeof (*add_v));
390  goto expand_ok;
391  }
392  }
393 
394  /* Crap. Try again */
395  BV (value_free) (h, save_new_v, new_log2_pages);
396  /*
397  * If we've already doubled the size of the bucket once,
398  * fall back to linear search now.
399  */
400  if (resplit_once)
401  goto mark_linear;
402  else
403  goto try_resplit;
404 
405 expand_ok:
406  /* Keep track of the number of linear-scan buckets */
407  if (tmp_b.linear_search ^ mark_bucket_linear)
408  h->linear_buckets += (mark_bucket_linear == 1) ? 1 : -1;
409 
410  tmp_b.log2_pages = new_log2_pages;
411  tmp_b.offset = BV (clib_bihash_get_offset) (h, save_new_v);
412  tmp_b.linear_search = mark_bucket_linear;
413 
415  b->as_u64 = tmp_b.as_u64;
416  v = BV (clib_bihash_get_value) (h, h->saved_bucket.offset);
417  BV (value_free) (h, v, old_log2_pages);
418 
419 unlock:
420  BV (clib_bihash_reset_cache) (b);
421  BV (clib_bihash_unlock_bucket) (b);
423  h->writer_lock[0] = 0;
424  return rv;
425 }
426 
427 int BV (clib_bihash_search)
428  (BVT (clib_bihash) * h,
429  BVT (clib_bihash_kv) * search_key, BVT (clib_bihash_kv) * valuep)
430 {
431  u64 hash;
432  u32 bucket_index;
433  BVT (clib_bihash_value) * v;
434 #if BIHASH_KVP_CACHE_SIZE > 0
435  BVT (clib_bihash_kv) * kvp;
436 #endif
437  BVT (clib_bihash_bucket) * b;
438  int i, limit;
439 
440  ASSERT (valuep);
441 
442  hash = BV (clib_bihash_hash) (search_key);
443 
444  bucket_index = hash & (h->nbuckets - 1);
445  b = &h->buckets[bucket_index];
446 
447  if (b->offset == 0)
448  return -1;
449 
450 #if BIHASH_KVP_CACHE_SIZE > 0
451  /* Check the cache, if currently enabled */
452  if (PREDICT_TRUE ((b->cache_lru & (1 << 15)) == 0))
453  {
454  limit = BIHASH_KVP_CACHE_SIZE;
455  kvp = b->cache;
456  for (i = 0; i < limit; i++)
457  {
458  if (BV (clib_bihash_key_compare) (kvp[i].key, search_key->key))
459  {
460  *valuep = kvp[i];
461  h->cache_hits++;
462  return 0;
463  }
464  }
465  }
466 #endif
467 
468  hash >>= h->log2_nbuckets;
469 
470  v = BV (clib_bihash_get_value) (h, b->offset);
471  limit = BIHASH_KVP_PER_PAGE;
472  v += (b->linear_search == 0) ? hash & ((1 << b->log2_pages) - 1) : 0;
473  if (PREDICT_FALSE (b->linear_search))
474  limit <<= b->log2_pages;
475 
476  for (i = 0; i < limit; i++)
477  {
478  if (BV (clib_bihash_key_compare) (v->kvp[i].key, search_key->key))
479  {
480  *valuep = v->kvp[i];
481 
482 #if BIHASH_KVP_CACHE_SIZE > 0
483  u8 cache_slot;
484  /* Shut off the cache */
485  if (BV (clib_bihash_lock_bucket) (b))
486  {
487  cache_slot = BV (clib_bihash_get_lru) (b);
488  b->cache[cache_slot] = v->kvp[i];
489  BV (clib_bihash_update_lru) (b, cache_slot);
490 
491  /* Reenable the cache */
492  BV (clib_bihash_unlock_bucket) (b);
493  h->cache_misses++;
494  }
495 #endif
496  return 0;
497  }
498  }
499  return -1;
500 }
501 
502 u8 *BV (format_bihash_lru) (u8 * s, va_list * args)
503 {
504 #if BIHASH_KVP_SIZE > 0
505  int i;
506  BVT (clib_bihash_bucket) * b = va_arg (*args, BVT (clib_bihash_bucket) *);
507  u16 cache_lru = b->cache_lru;
508 
509  s = format (s, "cache %s, order ", cache_lru & (1 << 15) ? "on" : "off");
510 
511  for (i = 0; i < BIHASH_KVP_CACHE_SIZE; i++)
512  s = format (s, "[%d] ", ((cache_lru >> (3 * i)) & 7));
513 
514  return (s);
515 #else
516  return format (s, "cache not configured");
517 #endif
518 }
519 
520 void
521 BV (clib_bihash_update_lru_not_inline) (BVT (clib_bihash_bucket) * b, u8 slot)
522 {
523 #if BIHASH_KVP_SIZE > 0
524  BV (clib_bihash_update_lru) (b, slot);
525 #endif
526 }
527 
528 u8 *BV (format_bihash) (u8 * s, va_list * args)
529 {
530  BVT (clib_bihash) * h = va_arg (*args, BVT (clib_bihash) *);
531  int verbose = va_arg (*args, int);
532  BVT (clib_bihash_bucket) * b;
533  BVT (clib_bihash_value) * v;
534  int i, j, k;
535  u64 active_elements = 0;
536 
537  s = format (s, "Hash table %s\n", h->name ? h->name : (u8 *) "(unnamed)");
538 
539  for (i = 0; i < h->nbuckets; i++)
540  {
541  b = &h->buckets[i];
542  if (b->offset == 0)
543  {
544  if (verbose > 1)
545  s = format (s, "[%d]: empty\n", i);
546  continue;
547  }
548 
549  if (verbose)
550  {
551  s = format (s, "[%d]: heap offset %d, len %d, linear %d\n", i,
552  b->offset, (1 << b->log2_pages), b->linear_search);
553  }
554 
555  v = BV (clib_bihash_get_value) (h, b->offset);
556  for (j = 0; j < (1 << b->log2_pages); j++)
557  {
558  for (k = 0; k < BIHASH_KVP_PER_PAGE; k++)
559  {
560  if (BV (clib_bihash_is_free) (&v->kvp[k]))
561  {
562  if (verbose > 1)
563  s = format (s, " %d: empty\n",
564  j * BIHASH_KVP_PER_PAGE + k);
565  continue;
566  }
567  if (verbose)
568  {
569  s = format (s, " %d: %U\n",
570  j * BIHASH_KVP_PER_PAGE + k,
571  BV (format_bihash_kvp), &(v->kvp[k]));
572  }
573  active_elements++;
574  }
575  v++;
576  }
577  }
578 
579  s = format (s, " %lld active elements\n", active_elements);
580  s = format (s, " %d free lists\n", vec_len (h->freelists));
581  s = format (s, " %d linear search buckets\n", h->linear_buckets);
582  s = format (s, " %lld cache hits, %lld cache misses\n",
583  h->cache_hits, h->cache_misses);
584  return s;
585 }
586 
588  (BVT (clib_bihash) * h, void *callback, void *arg)
589 {
590  int i, j, k;
591  BVT (clib_bihash_bucket) * b;
592  BVT (clib_bihash_value) * v;
593  void (*fp) (BVT (clib_bihash_kv) *, void *) = callback;
594 
595  for (i = 0; i < h->nbuckets; i++)
596  {
597  b = &h->buckets[i];
598  if (b->offset == 0)
599  continue;
600 
601  v = BV (clib_bihash_get_value) (h, b->offset);
602  for (j = 0; j < (1 << b->log2_pages); j++)
603  {
604  for (k = 0; k < BIHASH_KVP_PER_PAGE; k++)
605  {
606  if (BV (clib_bihash_is_free) (&v->kvp[k]))
607  continue;
608 
609  (*fp) (&v->kvp[k], arg);
610  }
611  v++;
612  }
613  }
614 }
615 
616 /** @endcond */
617 
618 /*
619  * fd.io coding-style-patch-verification: ON
620  *
621  * Local Variables:
622  * eval: (c-set-style "gnu")
623  * End:
624  */
#define vec_validate(V, I)
Make sure vector is long enough for given index (no header, unspecified alignment) ...
Definition: vec.h:432
sll srl srl sll sra u16x4 i
Definition: vector_sse2.h:337
#define BIHASH_KVP_PER_PAGE
Definition: bihash_16_8.h:20
void clib_bihash_free(clib_bihash *h)
Destroy a bounded index extensible hash table.
#define PREDICT_TRUE(x)
Definition: clib.h:98
void * mheap_alloc(void *memory, uword size)
Definition: mheap.c:947
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
#define vec_validate_aligned(V, I, A)
Make sure vector is long enough for given index (no header, specified alignment)
Definition: vec.h:443
int clib_bihash_add_del(clib_bihash *h, clib_bihash_kv *add_v, int is_add)
Add or delete a (key,value) pair from a bi-hash table.
static BVT(clib_bihash)
Definition: adj_nbr.c:26
unsigned long u64
Definition: types.h:89
#define mheap_free(v)
Definition: mheap.h:62
static uword clib_bihash_get_offset(clib_bihash *h, void *v)
Get clib mheap offset given a pointer.
#define v
Definition: acl.c:323
static vnet_classify_entry_t * split_and_rehash_linear(vnet_classify_table_t *t, vnet_classify_entry_t *old_values, u32 old_log2_pages, u32 new_log2_pages)
#define PREDICT_FALSE(x)
Definition: clib.h:97
void clib_bihash_init(clib_bihash *h, char *name, u32 nbuckets, uword memory_size)
initialize a bounded index extensible hash table
void clib_bihash_foreach_key_value_pair(clib_bihash *h, void *callback, void *arg)
Visit active (key,value) pairs in a bi-hash table.
static vnet_classify_entry_t * split_and_rehash(vnet_classify_table_t *t, vnet_classify_entry_t *old_values, u32 old_log2_pages, u32 new_log2_pages)
vec_header_t h
Definition: buffer.c:282
static void * clib_mem_set_heap(void *heap)
Definition: mem.h:226
#define clib_warning(format, args...)
Definition: error.h:59
u64 memory_size
Definition: vhost-user.h:77
#define clib_memcpy(a, b, c)
Definition: string.h:69
static void make_working_copy(vnet_classify_table_t *t, vnet_classify_bucket_t *b)
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
int clib_bihash_search(clib_bihash *h, clib_bihash_kv *search_v, clib_bihash_kv *return_v)
Search a bi-hash table.
static void clib_mem_free(void *p)
Definition: mem.h:179
u8 log2_pages
Definition: bihash_doc.h:62
u64 uword
Definition: types.h:112
template key/value backing page structure
Definition: bihash_doc.h:44
unsigned short u16
Definition: types.h:57
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
static uword max_log2(uword x)
Definition: clib.h:228
static_always_inline uword os_get_thread_index(void)
Definition: os.h:62
static void * clib_mem_alloc_aligned(uword size, uword align)
Definition: mem.h:120
#define CLIB_MEMORY_BARRIER()
Definition: clib.h:101
static void * clib_bihash_get_value(clib_bihash *h, uword offset)
Get pointer to value page given its clib mheap offset.
#define vec_validate_init_empty(V, I, INIT)
Make sure vector is long enough for given index and initialize empty space (no header, unspecified alignment)
Definition: vec.h:481
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:67
#define BIHASH_KVP_CACHE_SIZE
Definition: bihash_16_8.h:21