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Vector Packet Processing
bihash_vec8_8.h
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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_PER_PAGE
17 
18 #define BIHASH_TYPE _vec8_8
19 #define BIHASH_KVP_PER_PAGE 4
20 
21 #ifndef __included_bihash_vec8_8_h__
22 #define __included_bihash_vec8_8_h__
23 
24 #include <vppinfra/heap.h>
25 #include <vppinfra/format.h>
26 #include <vppinfra/pool.h>
27 #include <vppinfra/xxhash.h>
28 #include <vppinfra/crc32.h>
29 
30 /** 8 octet key, 8 octet key value pair */
31 typedef struct
32 {
33  u64 key; /**< the key */
34  u64 value; /**< the value */
36 
37 /** Decide if a clib_bihash_kv_vec8_8_t instance is free
38  @param v- pointer to the (key,value) pair
39 */
40 static inline int
42 {
43  if (v->key == ~0ULL && v->value == ~0ULL)
44  return 1;
45  return 0;
46 }
47 
48 /** Hash a clib_bihash_kv_vec8_8_t instance
49  @param v - pointer to the (key,value) pair, hash the key (only)
50 */
51 static inline u64
53 {
54  u8 *keyp = (u8 *) (v->key);
55  /* Note: to torture-test linear scan, make this fn return a constant */
56 #ifdef clib_crc32c_uses_intrinsics
57  return clib_crc32c (keyp, vec_len (keyp));
58 #else
59  {
60  int i, j;
61  u64 sum = 0;
62 
63  for (i = 0, j = 0; i < vec_len (keyp); i++)
64  {
65  sum ^= keyp[i] << (j * 8);
66  j++;
67  if (j == 4)
68  j = 0;
69  }
70 
71  return clib_xxhash (sum);
72  }
73 #endif
74 }
75 
76 /** Format a clib_bihash_kv_vec8_8_t instance
77  @param s - u8 * vector under construction
78  @param args (vararg) - the (key,value) pair to format
79  @return s - the u8 * vector under construction
80 */
81 static inline u8 *
82 format_bihash_kvp_vec8_8 (u8 * s, va_list * args)
83 {
84  clib_bihash_kv_vec8_8_t *v = va_arg (*args, clib_bihash_kv_vec8_8_t *);
85 
86  s = format (s, "key %U value %llu",
87  format_hex_bytes, v->key, vec_len ((u8 *) (v->key)), v->value);
88  return s;
89 }
90 
91 /** Compare two clib_bihash_kv_vec8_8_t instances
92  @param a - first key
93  @param b - second key
94 */
95 static inline int
97 {
98  u8 *a = (u8 *) a_arg;
99  u8 *b = (u8 *) b_arg;
100 
101  if (a_arg == ~0ULL || b_arg == ~0ULL)
102  return 0;
103 
104  if (vec_len (a) != vec_len (b))
105  return 0;
106 
107  return memcmp (a, b, vec_len (a)) == 0;
108 }
109 
110 #undef __included_bihash_template_h__
112 
113 #endif /* __included_bihash_vec8_8_h__ */
114 
115 /*
116  * fd.io coding-style-patch-verification: ON
117  *
118  * Local Variables:
119  * eval: (c-set-style "gnu")
120  * End:
121  */
a
Definition: bitmap.h:538
unsigned long u64
Definition: types.h:89
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:424
unsigned char u8
Definition: types.h:56
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
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:82
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:41
8 octet key, 8 octet key value pair
Definition: bihash_vec8_8.h:31
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:96
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
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:52