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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.
*/
#undef BIHASH_TYPE
#define BIHASH_TYPE _24_8
#define BIHASH_KVP_PER_PAGE 4
#ifndef __included_bihash_24_8_h__
#define __included_bihash_24_8_h__
#include <vppinfra/heap.h>
#include <vppinfra/format.h>
#include <vppinfra/pool.h>
#include <vppinfra/xxhash.h>
typedef struct {
u64 key[3];
u64 value;
} clib_bihash_kv_24_8_t;
static inline int clib_bihash_is_free_24_8 (clib_bihash_kv_24_8_t *v)
{
/* Free values are memset to 0xff, check a bit... */
if (v->key[0] == ~0ULL && v->value == ~0ULL)
return 1;
return 0;
}
static inline u32
crc_u32(u32 data, u32 value)
{
__asm__ volatile( "crc32l %[data], %[value];"
: [value] "+r" (value)
: [data] "rm" (data));
return value;
}
static inline u64 clib_bihash_hash_24_8 (clib_bihash_kv_24_8_t *v)
{
#if 0
u64 * dp = (u64 *) &v->key[0];
u64 value = 0;
value __builtin_ia32_crc32di (dp[0], value);
value __builtin_ia32_crc32di (dp[1], value);
value __builtin_ia32_crc32di (dp[2], value);
#endif
u32 * dp = (u32 *) &v->key[0];
u32 value = 0;
value = crc_u32 (dp[0], value);
value = crc_u32 (dp[1], value);
value = crc_u32 (dp[2], value);
value = crc_u32 (dp[3], value);
value = crc_u32 (dp[4], value);
value = crc_u32 (dp[5], value);
return value;
}
#if 0
static inline u64 clib_bihash_hash_24_8 (clib_bihash_kv_24_8_t *v)
{
u64 tmp = v->key[0] ^ v->key[1] ^ v->key[2];
return clib_xxhash (tmp);
}
#endif
static inline u8 * format_bihash_kvp_24_8 (u8 * s, va_list * args)
{
clib_bihash_kv_24_8_t * v = va_arg (*args, clib_bihash_kv_24_8_t *);
s = format (s, "key %llu %llu %llu value %llu",
v->key[0], v->key[1], v->key[2], v->value);
return s;
}
static inline int clib_bihash_key_compare_24_8 (u64 * a, u64 * b)
{
return ((a[0]^b[0]) | (a[1]^b[1]) | (a[2]^b[2])) == 0;
}
#undef __included_bihash_template_h__
#include <vppinfra/bihash_template.h>
#endif /* __included_bihash_24_8_h__ */
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