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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ Copyright (c) 2006 Eliot Dresselhaus
+
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject to
+ the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef included_qhash_h
+#define included_qhash_h
+
+#include <vppinfra/cache.h>
+#include <vppinfra/hash.h>
+
+/* Word hash tables. */
+typedef struct
+{
+ /* Number of elements in hash. */
+ u32 n_elts;
+
+ u32 log2_hash_size;
+
+ /* Jenkins hash seeds. */
+ u32 hash_seeds[3];
+
+ /* Fall back CLIB hash for overflow in fixed sized buckets. */
+ uword *overflow_hash;
+
+ u32 *overflow_counts, *overflow_free_indices;
+
+ u8 *hash_key_valid_bitmap;
+
+ uword *hash_keys;
+} qhash_t;
+
+always_inline qhash_t *
+qhash_header (void *v)
+{
+ return vec_header (v, sizeof (qhash_t));
+}
+
+always_inline uword
+qhash_elts (void *v)
+{
+ return v ? qhash_header (v)->n_elts : 0;
+}
+
+always_inline uword
+qhash_n_overflow (void *v)
+{
+ return v ? hash_elts (qhash_header (v)->overflow_hash) : 0;
+}
+
+#define QHASH_LOG2_KEYS_PER_BUCKET 2
+#define QHASH_KEYS_PER_BUCKET (1 << QHASH_LOG2_KEYS_PER_BUCKET)
+
+always_inline uword
+qhash_hash_mix (qhash_t * h, uword key)
+{
+ u32 a, b, c;
+
+ a = h->hash_seeds[0];
+ b = h->hash_seeds[1];
+ c = h->hash_seeds[2];
+
+ a ^= key;
+#if uword_bits == 64
+ b ^= key >> 32;
+#endif
+
+ hash_mix32 (a, b, c);
+
+ return c & pow2_mask (h->log2_hash_size);
+}
+
+#define qhash_resize(v,n) (v) = _qhash_resize ((v), (n), sizeof ((v)[0]))
+
+#define qhash_foreach(var,v,body)
+
+#define qhash_set_multiple(v,keys,n,results) \
+ (v) = _qhash_set_multiple ((v), sizeof ((v)[0]), (keys), (n), (results))
+
+#define qhash_unset_multiple(v,keys,n,results) \
+ _qhash_unset_multiple ((v), sizeof ((v)[0]), (keys), (n), (results))
+
+#define qhash_get(v,key) \
+({ \
+ uword _qhash_get_k = (key); \
+ qhash_get_first_match ((v), &_qhash_get_k, 1, &_qhash_get_k); \
+})
+
+#define qhash_set(v,k) \
+({ \
+ uword _qhash_set_k = (k); \
+ qhash_set_multiple ((v), &_qhash_set_k, 1, &_qhash_set_k); \
+ _qhash_set_k; \
+})
+
+#define qhash_unset(v,k) \
+({ \
+ uword _qhash_unset_k = (k); \
+ qhash_unset_multiple ((v), &_qhash_unset_k, 1, &_qhash_unset_k); \
+ _qhash_unset_k; \
+})
+
+void *_qhash_resize (void *v, uword length, uword elt_bytes);
+
+/* Lookup multiple keys in the same hash table. */
+void
+qhash_get_multiple (void *v,
+ uword * search_keys,
+ uword n_search_keys, u32 * result_indices);
+
+/* Lookup multiple keys in the same hash table.
+ Returns index of first matching key. */
+u32
+qhash_get_first_match (void *v,
+ uword * search_keys,
+ uword n_search_keys, uword * matching_key);
+
+/* Set/unset helper functions. */
+void *_qhash_set_multiple (void *v,
+ uword elt_bytes,
+ uword * search_keys,
+ uword n_search_keys, u32 * result_indices);
+void
+_qhash_unset_multiple (void *v,
+ uword elt_bytes,
+ uword * search_keys,
+ uword n_search_keys, u32 * result_indices);
+
+#endif /* included_qhash_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */