From 2f8bc0f258f66b4cb60ba2af2f045febacaf496e Mon Sep 17 00:00:00 2001
From: Mohammed Hawari <mohammed@hawari.fr>
Date: Tue, 24 Jun 2025 18:20:25 +0200
Subject: [PATCH] vppinfra: introduce bihash_56_8

Change-Id: I4d3cb6194c02ae53ead8f5ede35c3204d336a25f
Type: improvement
Signed-off-by: Mohammed Hawari <mohammed@hawari.fr>
---
 src/vppinfra/CMakeLists.txt |   1 +
 src/vppinfra/bihash_56_8.h  | 117 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+)
 create mode 100644 src/vppinfra/bihash_56_8.h

diff --git a/src/vppinfra/CMakeLists.txt b/src/vppinfra/CMakeLists.txt
index d52ecb096d7..131f5a5b530 100644
--- a/src/vppinfra/CMakeLists.txt
+++ b/src/vppinfra/CMakeLists.txt
@@ -128,6 +128,7 @@ set(VPPINFRA_HEADERS
   bihash_32_8.h
   bihash_40_8.h
   bihash_48_8.h
+  bihash_56_8.h
   bihash_8_8.h
   bihash_8_16.h
   bihash_24_16.h
diff --git a/src/vppinfra/bihash_56_8.h b/src/vppinfra/bihash_56_8.h
new file mode 100644
index 00000000000..3943a5aa195
--- /dev/null
+++ b/src/vppinfra/bihash_56_8.h
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2025 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
+#undef BIHASH_KVP_AT_BUCKET_LEVEL
+#undef BIHASH_LAZY_INSTANTIATE
+#undef BIHASH_BUCKET_PREFETCH_CACHE_LINES
+
+#define BIHASH_TYPE			   _56_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
+
+#ifndef __included_bihash_56_8_h__
+#define __included_bihash_56_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[7];
+  u64 value;
+} clib_bihash_kv_56_8_t;
+
+static inline void
+clib_bihash_mark_free_56_8 (clib_bihash_kv_56_8_t *v)
+{
+  v->value = 0xFEEDFACE8BADF00DULL;
+}
+
+static inline int
+clib_bihash_is_free_56_8 (const clib_bihash_kv_56_8_t *v)
+{
+  if (v->value == 0xFEEDFACE8BADF00DULL)
+    return 1;
+  return 0;
+}
+
+static inline u64
+clib_bihash_hash_56_8 (const clib_bihash_kv_56_8_t *v)
+{
+#ifdef clib_crc32c_uses_intrinsics
+  return clib_crc32c ((u8 *) v->key, 56);
+#else
+  u64 tmp = v->key[0] ^ v->key[1] ^ v->key[2] ^ v->key[3] ^ v->key[4] ^
+	    v->key[5] ^ v->key[6];
+  return clib_xxhash (tmp);
+#endif
+}
+
+static inline u8 *
+format_bihash_kvp_56_8 (u8 *s, va_list *args)
+{
+  clib_bihash_kv_56_8_t *v = va_arg (*args, clib_bihash_kv_56_8_t *);
+
+  s = format (s, "key %llu %llu %llu %llu %llu %llu %llu value %llu",
+	      v->key[0], v->key[1], v->key[2], v->key[3], v->key[4], v->key[5],
+	      v->key[6], v->value);
+  return s;
+}
+
+static inline int
+clib_bihash_key_compare_56_8 (u64 *a, u64 *b)
+{
+#if defined(CLIB_HAVE_VEC512)
+  return u64x8_is_equal (u64x8_mask_load_zero (a, 0x7f),
+			 u64x8_mask_load_zero (b, 0x7f));
+#elif defined(CLIB_HAVE_VEC256) && defined(CLIB_HAVE_VEC256_MASK_LOAD_STORE)
+  u64x4 v = { 0 };
+  v = u64x4_mask_load_zero (a + 4, 0x7) ^ u64x4_mask_load_zero (b + 4, 0x7);
+  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 = { 0, a[6] ^ b[6] };
+  v |= u64x2_load_unaligned (a) ^ u64x2_load_unaligned (b);
+  v |= u64x2_load_unaligned (a + 2) ^ u64x2_load_unaligned (b + 2);
+  v |= u64x2_load_unaligned (a + 4) ^ u64x2_load_unaligned (b + 4);
+  return u64x2_is_all_zero (v);
+#else
+  return ((a[0] ^ b[0]) | (a[1] ^ b[1]) | (a[2] ^ b[2]) | (a[3] ^ b[3]) |
+	  (a[4] ^ b[4]) | (a[5] ^ b[5]) | (a[6] ^ b[6])) == 0;
+#endif
+}
+
+#undef __included_bihash_template_h__
+#include <vppinfra/bihash_template.h>
+
+#endif /* __included_bihash_56_8_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
-- 
2.16.6