net: update licence for network headers
[dpdk.git] / lib / librte_table / rte_lru.h
1 /*-
2  *   BSD LICENSE
3  *
4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5  *   All rights reserved.
6  *
7  *   Redistribution and use in source and binary forms, with or without
8  *   modification, are permitted provided that the following conditions
9  *   are met:
10  *
11  *     * Redistributions of source code must retain the above copyright
12  *       notice, this list of conditions and the following disclaimer.
13  *     * Redistributions in binary form must reproduce the above copyright
14  *       notice, this list of conditions and the following disclaimer in
15  *       the documentation and/or other materials provided with the
16  *       distribution.
17  *     * Neither the name of Intel Corporation nor the names of its
18  *       contributors may be used to endorse or promote products derived
19  *       from this software without specific prior written permission.
20  *
21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33
34 #ifndef __INCLUDE_RTE_LRU_H__
35 #define __INCLUDE_RTE_LRU_H__
36
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40
41 #ifdef RTE_ARCH_X86_64
42 #include "rte_lru_x86.h"
43 #elif defined(RTE_ARCH_ARM64)
44 #include "rte_lru_arm64.h"
45 #else
46 #undef RTE_TABLE_HASH_LRU_STRATEGY
47 #define RTE_TABLE_HASH_LRU_STRATEGY                        1
48 #endif
49
50 #if RTE_TABLE_HASH_LRU_STRATEGY == 0
51
52 #define lru_init(bucket)                                                \
53 do                                                                      \
54         bucket = bucket;                                                \
55 while (0)
56
57 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
58
59 #define lru_update(bucket, mru_val)                                     \
60 do {                                                                    \
61         bucket = bucket;                                                \
62         mru_val = mru_val;                                              \
63 } while (0)
64
65 #elif RTE_TABLE_HASH_LRU_STRATEGY == 1
66
67 #define lru_init(bucket)                                                \
68 do                                                                      \
69         bucket->lru_list = 0x0000000100020003LLU;                       \
70 while (0)
71
72 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
73
74 #define lru_update(bucket, mru_val)                                     \
75 do {                                                                    \
76         uint64_t x, pos, x0, x1, x2, mask;                              \
77                                                                         \
78         x = bucket->lru_list;                                           \
79                                                                         \
80         pos = 4;                                                        \
81         if ((x >> 48) == ((uint64_t) mru_val))                          \
82                 pos = 3;                                                \
83                                                                         \
84         if (((x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
85                 pos = 2;                                                \
86                                                                         \
87         if (((x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val))            \
88                 pos = 1;                                                \
89                                                                         \
90         if ((x & 0xFFFFLLU) == ((uint64_t) mru_val))                    \
91                 pos = 0;                                                \
92                                                                         \
93                                                                         \
94         pos <<= 4;                                                      \
95         mask = (~0LLU) << pos;                                          \
96         x0 = x & (~mask);                                               \
97         x1 = (x >> 16) & mask;                                          \
98         x2 = (x << (48 - pos)) & (0xFFFFLLU << 48);                     \
99         x = x0 | x1 | x2;                                               \
100                                                                         \
101         if (pos != 64)                                                  \
102                 bucket->lru_list = x;                                   \
103 } while (0)
104
105 #elif (RTE_TABLE_HASH_LRU_STRATEGY == 2) || (RTE_TABLE_HASH_LRU_STRATEGY == 3)
106
107 /**
108  * These strategies are implemented in architecture specific header files.
109  */
110
111 #else
112
113 #error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY"
114
115 #endif
116
117 #ifdef __cplusplus
118 }
119 #endif
120
121 #endif