From 2ce28d6014f44a98f5b3387a4709dd56dbc2f8df Mon Sep 17 00:00:00 2001
From: Dave Barach <dave@barachs.net>
Date: Fri, 3 May 2019 12:58:01 -0400
Subject: Add bihash statistics hook

Example / unit-test in .../src/plugins/unittest/bihash_test.c

Change-Id: I23fd0ba742d65291667a755965aee1a3d3477ca2
Signed-off-by: Dave Barach <dave@barachs.net>
---
 src/vppinfra/bihash_8_8_stats.h | 101 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 src/vppinfra/bihash_8_8_stats.h

(limited to 'src/vppinfra/bihash_8_8_stats.h')

diff --git a/src/vppinfra/bihash_8_8_stats.h b/src/vppinfra/bihash_8_8_stats.h
new file mode 100644
index 00000000000..a6c947ab5c4
--- /dev/null
+++ b/src/vppinfra/bihash_8_8_stats.h
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ */
+#undef BIHASH_TYPE
+#undef BIHASH_KVP_PER_PAGE
+#undef BIHASH_32_64_SVM
+#undef BIHASH_ENABLE_STATS
+
+#define BIHASH_TYPE _8_8_stats
+#define BIHASH_KVP_PER_PAGE 4
+#define BIHASH_ENABLE_STATS 1
+
+#ifndef __included_bihash_8_8_stats_h__
+#define __included_bihash_8_8__stats_h__
+
+#include <vppinfra/heap.h>
+#include <vppinfra/format.h>
+#include <vppinfra/pool.h>
+#include <vppinfra/xxhash.h>
+#include <vppinfra/crc32.h>
+
+/** 8 octet key, 8 octet key value pair */
+typedef struct
+{
+  u64 key;			/**< the key */
+  u64 value;			/**< the value */
+} clib_bihash_kv_8_8_stats_t;
+
+/** Decide if a clib_bihash_kv_8_8_t instance is free
+    @param v- pointer to the (key,value) pair
+*/
+static inline int
+clib_bihash_is_free_8_8_stats (clib_bihash_kv_8_8_stats_t * v)
+{
+  if (v->key == ~0ULL && v->value == ~0ULL)
+    return 1;
+  return 0;
+}
+
+/** Hash a clib_bihash_kv_8_8_t instance
+    @param v - pointer to the (key,value) pair, hash the key (only)
+*/
+static inline u64
+clib_bihash_hash_8_8_stats (clib_bihash_kv_8_8_stats_t * v)
+{
+  /* Note: to torture-test linear scan, make this fn return a constant */
+#ifdef clib_crc32c_uses_intrinsics
+  return clib_crc32c ((u8 *) & v->key, 8);
+#else
+  return clib_xxhash (v->key);
+#endif
+}
+
+/** Format a clib_bihash_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
+*/
+static inline u8 *
+format_bihash_kvp_8_8_stats (u8 * s, va_list * args)
+{
+  clib_bihash_kv_8_8_stats_t *v =
+    va_arg (*args, clib_bihash_kv_8_8_stats_t *);
+
+  s = format (s, "key %llu value %llu", v->key, v->value);
+  return s;
+}
+
+/** Compare two clib_bihash_kv_8_8_t instances
+    @param a - first key
+    @param b - second key
+*/
+static inline int
+clib_bihash_key_compare_8_8_stats (u64 a, u64 b)
+{
+  return a == b;
+}
+
+#undef __included_bihash_template_h__
+#include <vppinfra/bihash_template.h>
+
+#endif /* __included_bihash_8_8_stats_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
-- 
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