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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 #undef BIHASH_32_64_SVM
18 #undef BIHASH_ENABLE_STATS
19 #undef BIHASH_KVP_AT_BUCKET_LEVEL
20 #undef BIHASH_LAZY_INSTANTIATE
21 #undef BIHASH_BUCKET_PREFETCH_CACHE_LINES
22 
23 #define BIHASH_TYPE _vec8_8
24 #define BIHASH_KVP_PER_PAGE 4
25 #define BIHASH_KVP_AT_BUCKET_LEVEL 0
26 #define BIHASH_LAZY_INSTANTIATE 1
27 #define BIHASH_BUCKET_PREFETCH_CACHE_LINES 1
28 
29 #ifndef __included_bihash_vec8_8_h__
30 #define __included_bihash_vec8_8_h__
31 
32 #include <vppinfra/heap.h>
33 #include <vppinfra/format.h>
34 #include <vppinfra/pool.h>
35 #include <vppinfra/xxhash.h>
36 #include <vppinfra/crc32.h>
37 
38 /** 8 octet key, 8 octet key value pair */
39 typedef struct
40 {
41  u64 key; /**< the key */
42  u64 value; /**< the value */
44 
45 /** Decide if a clib_bihash_kv_vec8_8_t instance is free
46  @param v- pointer to the (key,value) pair
47 */
48 static inline int
50 {
51  if (v->key == ~0ULL && v->value == ~0ULL)
52  return 1;
53  return 0;
54 }
55 
56 /** Hash a clib_bihash_kv_vec8_8_t instance
57  @param v - pointer to the (key,value) pair, hash the key (only)
58 */
59 static inline u64
61 {
62  u8 *keyp = (u8 *) (v->key);
63  /* Note: to torture-test linear scan, make this fn return a constant */
64 #ifdef clib_crc32c_uses_intrinsics
65  return clib_crc32c (keyp, vec_len (keyp));
66 #else
67  {
68  int i, j;
69  u64 sum = 0;
70 
71  for (i = 0, j = 0; i < vec_len (keyp); i++)
72  {
73  sum ^= keyp[i] << (j * 8);
74  j++;
75  if (j == 4)
76  j = 0;
77  }
78 
79  return clib_xxhash (sum);
80  }
81 #endif
82 }
83 
84 /** Format a clib_bihash_kv_vec8_8_t instance
85  @param s - u8 * vector under construction
86  @param args (vararg) - the (key,value) pair to format
87  @return s - the u8 * vector under construction
88 */
89 static inline u8 *
90 format_bihash_kvp_vec8_8 (u8 * s, va_list * args)
91 {
92  clib_bihash_kv_vec8_8_t *v = va_arg (*args, clib_bihash_kv_vec8_8_t *);
93 
94  s = format (s, "key %U value %llu",
95  format_hex_bytes, v->key, vec_len ((u8 *) (v->key)), v->value);
96  return s;
97 }
98 
99 /** Compare two clib_bihash_kv_vec8_8_t instances
100  @param a - first key
101  @param b - second key
102 */
103 static inline int
105 {
106  u8 *a = (u8 *) a_arg;
107  u8 *b = (u8 *) b_arg;
108 
109  if (a_arg == ~0ULL || b_arg == ~0ULL)
110  return 0;
111 
112  if (vec_len (a) != vec_len (b))
113  return 0;
114 
115  return memcmp (a, b, vec_len (a)) == 0;
116 }
117 
118 #undef __included_bihash_template_h__
120 
121 #endif /* __included_bihash_vec8_8_h__ */
122 
123 /*
124  * fd.io coding-style-patch-verification: ON
125  *
126  * Local Variables:
127  * eval: (c-set-style "gnu")
128  * End:
129  */
clib_bihash_kv_vec8_8_t
8 octet key, 8 octet key value pair
Definition: bihash_vec8_8.h:39
bihash_template.h
format_hex_bytes
u8 * format_hex_bytes(u8 *s, va_list *va)
Definition: std-formats.c:84
clib_bihash_key_compare_vec8_8
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:104
clib_bihash_kv_vec8_8_t::value
u64 value
the value
Definition: bihash_vec8_8.h:42
format_bihash_kvp_vec8_8
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:90
vec_len
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
Definition: vec_bootstrap.h:142
clib_bihash_kv_vec8_8_t::key
u64 key
the key
Definition: bihash_vec8_8.h:41
crc32.h
pool.h
Fixed length block allocator. Pools are built from clib vectors and bitmaps. Use pools when repeatedl...
format.h
clib_xxhash
static u64 clib_xxhash(u64 key)
Definition: xxhash.h:58
xxhash.h
u64
unsigned long u64
Definition: types.h:89
format
description fragment has unexpected format
Definition: map.api:433
clib_bihash_hash_vec8_8
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:60
b
vlib_buffer_t ** b
Definition: nat44_ei_out2in.c:717
u8
unsigned char u8
Definition: types.h:56
a
a
Definition: bitmap.h:525
i
int i
Definition: flowhash_template.h:376
heap.h
clib_bihash_is_free_vec8_8
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:49