add cuckoo hash

Change-Id: I78215041588014e9e5c3599c60471ced610735bb
Signed-off-by: Klement Sekera <ksekera@cisco.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/src/vppinfra/cuckoo_8_8.h b/src/vppinfra/cuckoo_8_8.h
new file mode 100644
index 00000000000..127e4e5b76d
--- /dev/null
+++ b/src/vppinfra/cuckoo_8_8.h
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+#undef CLIB_CUCKOO_TYPE
+
+#define CLIB_CUCKOO_TYPE _8_8
+#define CLIB_CUCKOO_KVP_PER_BUCKET (4)
+#define CLIB_CUCKOO_LOG2_KVP_PER_BUCKET (2)
+#define CLIB_CUCKOO_BFS_MAX_STEPS (2000)
+#define CLIB_CUCKOO_BFS_MAX_PATH_LENGTH (8)
+
+#ifndef __included_cuckoo_8_8_h__
+#define __included_cuckoo_8_8_h__
+
+#include <vppinfra/heap.h>
+#include <vppinfra/format.h>
+#include <vppinfra/pool.h>
+#include <vppinfra/xxhash.h>
+#include <vppinfra/cuckoo_debug.h>
+#include <vppinfra/cuckoo_common.h>
+
+#undef CLIB_CUCKOO_OPTIMIZE_PREFETCH
+#undef CLIB_CUCKOO_OPTIMIZE_CMP_REDUCED_HASH
+#undef CLIB_CUCKOO_OPTIMIZE_UNROLL
+#undef CLIB_CUCKOO_OPTIMIZE_USE_COUNT_LIMITS_SEARCH
+#define CLIB_CUCKOO_OPTIMIZE_PREFETCH 1
+#define CLIB_CUCKOO_OPTIMIZE_CMP_REDUCED_HASH 1
+#define CLIB_CUCKOO_OPTIMIZE_UNROLL 1
+#define CLIB_CUCKOO_OPTIMIZE_USE_COUNT_LIMITS_SEARCH 1
+
+#include <x86intrin.h>
+
+/** 8 octet key, 8 octet key value pair */
+typedef struct
+{
+  u64 key;   /**< the key */
+  u64 value; /**< the value */
+} clib_cuckoo_kv_8_8_t;
+
+/** Decide if a clib_cuckoo_kv_8_8_t instance is free
+    @param v- pointer to the (key,value) pair
+*/
+always_inline int
+clib_cuckoo_kv_is_free_8_8 (const clib_cuckoo_kv_8_8_t * v)
+{
+  if (v->key == ~0ULL && v->value == ~0ULL)
+    return 1;
+  return 0;
+}
+
+always_inline void
+clib_cuckoo_kv_set_free_8_8 (clib_cuckoo_kv_8_8_t * v)
+{
+  memset (v, 0xff, sizeof (*v));
+}
+
+/** Format a clib_cuckoo_kv_8_8_t instance
+    @param s - u8 * vector under construction
+    @param args (vararg) - the (key,value) pair to format
+    @return s - the u8 * vector under construction
+*/
+always_inline u8 *
+format_cuckoo_kvp_8_8 (u8 * s, va_list * args)
+{
+  clib_cuckoo_kv_8_8_t *v = va_arg (*args, clib_cuckoo_kv_8_8_t *);
+
+  if (clib_cuckoo_kv_is_free_8_8 (v))
+    {
+      s = format (s, " -- empty -- ", v->key, v->value);
+    }
+  else
+    {
+      s = format (s, "key %llu value %llu", v->key, v->value);
+    }
+  return s;
+}
+
+always_inline u64
+clib_cuckoo_hash_8_8 (clib_cuckoo_kv_8_8_t * v)
+{
+#if __SSE4_2__ && !defined (__i386__)
+  return _mm_crc32_u64 (0, v->key);
+#else
+  return clib_xxhash (v->key);
+#endif
+}
+
+/** Compare two clib_cuckoo_kv_8_8_t instances
+    @param a - first key
+    @param b - second key
+*/
+always_inline int
+clib_cuckoo_key_compare_8_8 (u64 a, u64 b)
+{
+  return a == b;
+}
+
+#if 0
+#undef __included_cuckoo_template_h__
+#include <vppinfra/cuckoo_template.h>
+#endif
+
+#endif /* __included_cuckoo_8_8_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */