+ if (alloc_arena_next (h) > alloc_arena_mapped (h))
+ {
+ void *base, *rv;
+ uword alloc = alloc_arena_next (h) - alloc_arena_mapped (h);
+ int mmap_flags = MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS;
+ int mmap_flags_huge = (mmap_flags | MAP_HUGETLB | MAP_LOCKED |
+ BIHASH_LOG2_HUGEPAGE_SIZE << MAP_HUGE_SHIFT);
+
+ /* new allocation is 25% of existing one */
+ if (alloc_arena_mapped (h) >> 2 > alloc)
+ alloc = alloc_arena_mapped (h) >> 2;
+
+ /* round allocation to page size */
+ alloc = round_pow2 (alloc, 1 << BIHASH_LOG2_HUGEPAGE_SIZE);
+
+ base = (void *) (uword) (alloc_arena (h) + alloc_arena_mapped (h));
+
+ rv = mmap (base, alloc, PROT_READ | PROT_WRITE, mmap_flags_huge, -1, 0);
+
+ /* fallback - maybe we are still able to allocate normal pages */
+ if (rv == MAP_FAILED || mlock (base, alloc) != 0)
+ rv = mmap (base, alloc, PROT_READ | PROT_WRITE, mmap_flags, -1, 0);
+
+ if (rv == MAP_FAILED)
+ os_out_of_memory ();
+
+ alloc_arena_mapped (h) += alloc;
+ }
+
+ return (void *) (uword) (rv + alloc_arena (h));
+}
+
+static void BV (clib_bihash_instantiate) (BVT (clib_bihash) * h)
+{
+ uword bucket_size;
+
+ if (BIHASH_USE_HEAP)
+ {
+ h->heap = clib_mem_get_heap ();
+ h->chunks = 0;
+ alloc_arena (h) = (uword) clib_mem_get_heap_base (h->heap);
+ }
+ else
+ {
+ alloc_arena (h) = clib_mem_vm_reserve (0, h->memory_size,
+ BIHASH_LOG2_HUGEPAGE_SIZE);
+ if (alloc_arena (h) == ~0)
+ os_out_of_memory ();
+ alloc_arena_next (h) = 0;
+ alloc_arena_size (h) = h->memory_size;
+ alloc_arena_mapped (h) = 0;
+ }
+
+ bucket_size = h->nbuckets * sizeof (h->buckets[0]);
+
+ if (BIHASH_KVP_AT_BUCKET_LEVEL)
+ bucket_size +=
+ h->nbuckets * BIHASH_KVP_PER_PAGE * sizeof (BVT (clib_bihash_kv));
+
+ h->buckets = BV (alloc_aligned) (h, bucket_size);
+ clib_memset_u8 (h->buckets, 0, bucket_size);
+
+ if (BIHASH_KVP_AT_BUCKET_LEVEL)
+ {
+ int i, j;
+ BVT (clib_bihash_bucket) * b;
+
+ b = h->buckets;
+
+ for (i = 0; i < h->nbuckets; i++)
+ {
+ BVT (clib_bihash_kv) * v;
+ b->offset = BV (clib_bihash_get_offset) (h, (void *) (b + 1));
+ b->refcnt = 1;
+ /* Mark all elements free */
+ v = (void *) (b + 1);
+ for (j = 0; j < BIHASH_KVP_PER_PAGE; j++)
+ {
+ BV (clib_bihash_mark_free) (v);
+ v++;
+ }
+ /* Compute next bucket start address */
+ b = (void *) (((uword) b) + sizeof (*b) +
+ (BIHASH_KVP_PER_PAGE *
+ sizeof (BVT (clib_bihash_kv))));
+ }
+ }
+ CLIB_MEMORY_STORE_BARRIER ();
+ h->instantiated = 1;