FD.io VPP  v18.04-17-g3a0d853
Vector Packet Processing
bihash_vec8_8.h
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2017 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 #undef BIHASH_KVP_CACHE_SIZE
17 #undef BIHASH_KVP_PER_PAGE
18 
19 #define BIHASH_TYPE _vec8_8
20 #define BIHASH_KVP_PER_PAGE 4
21 #define BIHASH_KVP_CACHE_SIZE 0
22 
23 #ifndef __included_bihash_vec8_8_h__
24 #define __included_bihash_vec8_8_h__
25 
26 #include <vppinfra/heap.h>
27 #include <vppinfra/format.h>
28 #include <vppinfra/pool.h>
29 #include <vppinfra/xxhash.h>
30 #include <vppinfra/crc32.h>
31 
32 /** 8 octet key, 8 octet key value pair */
33 typedef struct
34 {
35  u64 key; /**< the key */
36  u64 value; /**< the value */
38 
39 /** Decide if a clib_bihash_kv_vec8_8_t instance is free
40  @param v- pointer to the (key,value) pair
41 */
42 static inline int
44 {
45  if (v->key == ~0ULL && v->value == ~0ULL)
46  return 1;
47  return 0;
48 }
49 
50 /** Hash a clib_bihash_kv_vec8_8_t instance
51  @param v - pointer to the (key,value) pair, hash the key (only)
52 */
53 static inline u64
55 {
56  u8 *keyp = (u8 *) (v->key);
57  /* Note: to torture-test linear scan, make this fn return a constant */
58 #ifdef clib_crc32c_uses_intrinsics
59  return clib_crc32c (keyp, vec_len (keyp));
60 #else
61  {
62  int i, j;
63  u64 sum = 0;
64 
65  for (i = 0, j = 0; i < vec_len (keyp); i++)
66  {
67  sum ^= keyp[i] << (j * 8);
68  j++;
69  if (j == 4)
70  j = 0;
71  }
72 
73  return clib_xxhash (sum);
74  }
75 #endif
76 }
77 
78 /** Format a clib_bihash_kv_vec8_8_t instance
79  @param s - u8 * vector under construction
80  @param args (vararg) - the (key,value) pair to format
81  @return s - the u8 * vector under construction
82 */
83 static inline u8 *
84 format_bihash_kvp_vec8_8 (u8 * s, va_list * args)
85 {
87 
88  s = format (s, "key %U value %llu",
89  format_hex_bytes, v->key, vec_len ((u8 *) (v->key)), v->value);
90  return s;
91 }
92 
93 /** Compare two clib_bihash_kv_vec8_8_t instances
94  @param a - first key
95  @param b - second key
96 */
97 static inline int
99 {
100  u8 *a = (u8 *) a_arg;
101  u8 *b = (u8 *) b_arg;
102 
103  if (a_arg == ~0ULL || b_arg == ~0ULL)
104  return 0;
105 
106  if (vec_len (a) != vec_len (b))
107  return 0;
108 
109  return memcmp (a, b, vec_len (a)) == 0;
110 }
111 
112 #undef __included_bihash_template_h__
114 
115 #endif /* __included_bihash_vec8_8_h__ */
116 
117 /*
118  * fd.io coding-style-patch-verification: ON
119  *
120  * Local Variables:
121  * eval: (c-set-style "gnu")
122  * End:
123  */
a
Definition: bitmap.h:516
Fixed length block allocator.
static u64 clib_xxhash(u64 key)
Definition: xxhash.h:58
int i
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
unsigned long u64
Definition: types.h:89
static u8 * format_bihash_kvp_vec8_8(u8 *s, va_list *args)
Format a clib_bihash_kv_vec8_8_t instance.
Definition: bihash_vec8_8.h:84
#define v
Definition: acl.c:495
static int clib_bihash_is_free_vec8_8(clib_bihash_kv_vec8_8_t *v)
Decide if a clib_bihash_kv_vec8_8_t instance is free.
Definition: bihash_vec8_8.h:43
8 octet key, 8 octet key value pair
Definition: bihash_vec8_8.h:33
static int clib_bihash_key_compare_vec8_8(u64 a_arg, u64 b_arg)
Compare two clib_bihash_kv_vec8_8_t instances.
Definition: bihash_vec8_8.h:98
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
static u64 clib_bihash_hash_vec8_8(clib_bihash_kv_vec8_8_t *v)
Hash a clib_bihash_kv_vec8_8_t instance.
Definition: bihash_vec8_8.h:54