diff options
author | Ed Warnicke <eaw@cisco.com> | 2015-12-08 15:45:58 -0700 |
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committer | Ed Warnicke <eaw@cisco.com> | 2015-12-08 15:47:27 -0700 |
commit | cb9cadad578297ffd78fa8a33670bdf1ab669e7e (patch) | |
tree | 6ac2be912482cc7849a26f0ab845561c3d7f4e26 /vppinfra/vppinfra/bihash_24_8.h | |
parent | fb0815d4ae4bb0fe27bd9313f34b45c8593b907e (diff) |
Initial commit of vpp code.v1.0.0
Change-Id: Ib246f1fbfce93274020ee93ce461e3d8bd8b9f17
Signed-off-by: Ed Warnicke <eaw@cisco.com>
Diffstat (limited to 'vppinfra/vppinfra/bihash_24_8.h')
-rw-r--r-- | vppinfra/vppinfra/bihash_24_8.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/vppinfra/vppinfra/bihash_24_8.h b/vppinfra/vppinfra/bihash_24_8.h new file mode 100644 index 00000000000..9d5b3bcbf3c --- /dev/null +++ b/vppinfra/vppinfra/bihash_24_8.h @@ -0,0 +1,97 @@ +/* + * 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__ */ |