FD.io VPP  v16.06
Vector Packet Processing
bihash_24_8.h
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #undef BIHASH_TYPE
16 
17 #define BIHASH_TYPE _24_8
18 #define BIHASH_KVP_PER_PAGE 4
19 
20 #ifndef __included_bihash_24_8_h__
21 #define __included_bihash_24_8_h__
22 
23 #include <vppinfra/heap.h>
24 #include <vppinfra/format.h>
25 #include <vppinfra/pool.h>
26 #include <vppinfra/xxhash.h>
27 
28 typedef struct {
29  u64 key[3];
32 
34 {
35  /* Free values are memset to 0xff, check a bit... */
36  if (v->key[0] == ~0ULL && v->value == ~0ULL)
37  return 1;
38  return 0;
39 }
40 
41 #if __SSE4_2__
42 static inline u32
43 crc_u32(u32 data, u32 value)
44 {
45  __asm__ volatile( "crc32l %[data], %[value];"
46  : [value] "+r" (value)
47  : [data] "rm" (data));
48  return value;
49 }
50 
52 {
53  u32 * dp = (u32 *) &v->key[0];
54  u32 value = 0;
55 
56  value = crc_u32 (dp[0], value);
57  value = crc_u32 (dp[1], value);
58  value = crc_u32 (dp[2], value);
59  value = crc_u32 (dp[3], value);
60  value = crc_u32 (dp[4], value);
61  value = crc_u32 (dp[5], value);
62 
63  return value;
64 }
65 #else
67 {
68  u64 tmp = v->key[0] ^ v->key[1] ^ v->key[2];
69  return clib_xxhash (tmp);
70 }
71 #endif
72 
73 static inline u8 * format_bihash_kvp_24_8 (u8 * s, va_list * args)
74 {
75  clib_bihash_kv_24_8_t * v = va_arg (*args, clib_bihash_kv_24_8_t *);
76 
77  s = format (s, "key %llu %llu %llu value %llu",
78  v->key[0], v->key[1], v->key[2], v->value);
79  return s;
80 }
81 
82 static inline int clib_bihash_key_compare_24_8 (u64 * a, u64 * b)
83 {
84  return ((a[0]^b[0]) | (a[1]^b[1]) | (a[2]^b[2])) == 0;
85 }
86 #undef __included_bihash_template_h__
88 
89 #endif /* __included_bihash_24_8_h__ */
a
Definition: bitmap.h:393
static u64 clib_xxhash(u64 key)
Definition: xxhash.h:57
static u32 crc_u32(u32 data, u32 value)
Definition: map.c:24
static int clib_bihash_key_compare_24_8(u64 *a, u64 *b)
Definition: bihash_24_8.h:82
unsigned long u64
Definition: types.h:89
static u64 clib_bihash_hash_24_8(clib_bihash_kv_24_8_t *v)
Definition: bihash_24_8.h:66
unsigned int u32
Definition: types.h:88
u8 * format(u8 *s, char *fmt,...)
Definition: format.c:405
static u8 * format_bihash_kvp_24_8(u8 *s, va_list *args)
Definition: bihash_24_8.h:73
unsigned char u8
Definition: types.h:56
static int clib_bihash_is_free_24_8(clib_bihash_kv_24_8_t *v)
Definition: bihash_24_8.h:33