vppinfra: add bihash with 32 byte key

Type: feature

Add header to define bihash_32_8.

Change-Id: Ia8a21a1e76cf0c05b8f8a2d1f5dbc0dc586d7801
Signed-off-by: Matthew Smith <mgsmith@netgate.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/src/vppinfra/bihash_32_8.h b/src/vppinfra/bihash_32_8.h
new file mode 100644
index 00000000000..0935fcce184
--- /dev/null
+++ b/src/vppinfra/bihash_32_8.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2021 Rubicon Communications, LLC.
+ * 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
+#undef BIHASH_KVP_AT_BUCKET_LEVEL
+#undef BIHASH_LAZY_INSTANTIATE
+#undef BIHASH_BUCKET_PREFETCH_CACHE_LINES
+#undef BIHASH_USE_HEAP
+
+#define BIHASH_TYPE			   _32_8
+#define BIHASH_KVP_PER_PAGE		   4
+#define BIHASH_KVP_AT_BUCKET_LEVEL	   0
+#define BIHASH_LAZY_INSTANTIATE		   1
+#define BIHASH_BUCKET_PREFETCH_CACHE_LINES 1
+#define BIHASH_USE_HEAP			   1
+
+#ifndef __included_bihash_32_8_h__
+#define __included_bihash_32_8_h__
+
+#include <vppinfra/crc32.h>
+#include <vppinfra/heap.h>
+#include <vppinfra/format.h>
+#include <vppinfra/pool.h>
+#include <vppinfra/xxhash.h>
+
+typedef struct
+{
+  u64 key[4];
+  u64 value;
+} clib_bihash_kv_32_8_t;
+
+static inline int
+clib_bihash_is_free_32_8 (const clib_bihash_kv_32_8_t *v)
+{
+  /* Free values are clib_memset to 0xff, check a bit... */
+  if (v->key[0] == ~0ULL && v->value == ~0ULL)
+    return 1;
+  return 0;
+}
+
+static inline u64
+clib_bihash_hash_32_8 (const clib_bihash_kv_32_8_t *v)
+{
+#ifdef clib_crc32c_uses_intrinsics
+  return clib_crc32c ((u8 *) v->key, 32);
+#else
+  u64 tmp = v->key[0] ^ v->key[1] ^ v->key[2] ^ v->key[3];
+  return clib_xxhash (tmp);
+#endif
+}
+
+static inline u8 *
+format_bihash_kvp_32_8 (u8 *s, va_list *args)
+{
+  clib_bihash_kv_32_8_t *v = va_arg (*args, clib_bihash_kv_32_8_t *);
+
+  s = format (s, "key %llu %llu %llu %llu value %llu", v->key[0], v->key[1],
+	      v->key[2], v->key[3], v->value);
+  return s;
+}
+
+static inline int
+clib_bihash_key_compare_32_8 (u64 *a, u64 *b)
+{
+#if defined(CLIB_HAVE_VEC512)
+  u64x8 v = u64x8_load_unaligned (a) ^ u64x8_load_unaligned (b);
+  return (u64x8_is_zero_mask (v) & 0xf) == 0;
+#elif defined(CLIB_HAVE_VEC256)
+  u64x4 v = u64x4_load_unaligned (a) ^ u64x4_load_unaligned (b);
+  return u64x4_is_all_zero (v);
+#elif defined(CLIB_HAVE_VEC128) &&                                            \
+  defined(CLIB_HAVE_VEC128_UNALIGNED_LOAD_STORE)
+  u64x2 v;
+  v = u64x2_load_unaligned (a) ^ u64x2_load_unaligned (b);
+  v |= u64x2_load_unaligned (a + 2) ^ u64x2_load_unaligned (b + 2);
+  return u64x2_is_all_zero (v);
+#else
+  return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2]) | (a[3] ^ b[3])) == 0;
+#endif
+}
+
+#undef __included_bihash_template_h__
+#include <vppinfra/bihash_template.h>
+
+#endif /* __included_bihash_32_8_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */