DPDK  22.07.0-rc3
rte_hash_crc.h
Go to the documentation of this file.
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright(c) 2010-2014 Intel Corporation
3  */
4 
5 #ifndef _RTE_HASH_CRC_H_
6 #define _RTE_HASH_CRC_H_
7 
14 #ifdef __cplusplus
15 extern "C" {
16 #endif
17 
18 #include <stdint.h>
19 
20 #include <rte_branch_prediction.h>
21 #include <rte_common.h>
22 #include <rte_config.h>
23 #include <rte_cpuflags.h>
24 #include <rte_log.h>
25 
26 #include "rte_crc_sw.h"
27 
28 #define CRC32_SW (1U << 0)
29 #define CRC32_SSE42 (1U << 1)
30 #define CRC32_x64 (1U << 2)
31 #define CRC32_SSE42_x64 (CRC32_x64|CRC32_SSE42)
32 #define CRC32_ARM64 (1U << 3)
33 
34 static uint8_t crc32_alg = CRC32_SW;
35 
36 #if defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_CRC32)
37 #include "rte_crc_arm64.h"
38 #elif defined(RTE_ARCH_X86)
39 #include "rte_crc_x86.h"
40 #else
41 #include "rte_crc_generic.h"
42 #endif
43 
56 static inline void
58 {
59  crc32_alg = CRC32_SW;
60 
61  if (alg == CRC32_SW)
62  return;
63 
64 #if defined RTE_ARCH_X86
65  if (!(alg & CRC32_SSE42_x64))
66  RTE_LOG(WARNING, HASH,
67  "Unsupported CRC32 algorithm requested using CRC32_x64/CRC32_SSE42\n");
68  if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T) || alg == CRC32_SSE42)
69  crc32_alg = CRC32_SSE42;
70  else
71  crc32_alg = CRC32_SSE42_x64;
72 #endif
73 
74 #if defined RTE_ARCH_ARM64
75  if (!(alg & CRC32_ARM64))
76  RTE_LOG(WARNING, HASH,
77  "Unsupported CRC32 algorithm requested using CRC32_ARM64\n");
78  if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
79  crc32_alg = CRC32_ARM64;
80 #endif
81 
82  if (crc32_alg == CRC32_SW)
83  RTE_LOG(WARNING, HASH,
84  "Unsupported CRC32 algorithm requested using CRC32_SW\n");
85 }
86 
87 /* Setting the best available algorithm */
88 RTE_INIT(rte_hash_crc_init_alg)
89 {
90 #if defined(RTE_ARCH_X86)
91  rte_hash_crc_set_alg(CRC32_SSE42_x64);
92 #elif defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_CRC32)
93  rte_hash_crc_set_alg(CRC32_ARM64);
94 #else
95  rte_hash_crc_set_alg(CRC32_SW);
96 #endif
97 }
98 
99 #ifdef __DOXYGEN__
100 
111 static inline uint32_t
112 rte_hash_crc_1byte(uint8_t data, uint32_t init_val);
113 
124 static inline uint32_t
125 rte_hash_crc_2byte(uint16_t data, uint32_t init_val);
126 
137 static inline uint32_t
138 rte_hash_crc_4byte(uint32_t data, uint32_t init_val);
139 
150 static inline uint32_t
151 rte_hash_crc_8byte(uint64_t data, uint32_t init_val);
152 
153 #endif /* __DOXYGEN__ */
154 
167 static inline uint32_t
168 rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
169 {
170  unsigned i;
171  uintptr_t pd = (uintptr_t) data;
172 
173  for (i = 0; i < data_len / 8; i++) {
174  init_val = rte_hash_crc_8byte(*(const uint64_t *)pd, init_val);
175  pd += 8;
176  }
177 
178  if (data_len & 0x4) {
179  init_val = rte_hash_crc_4byte(*(const uint32_t *)pd, init_val);
180  pd += 4;
181  }
182 
183  if (data_len & 0x2) {
184  init_val = rte_hash_crc_2byte(*(const uint16_t *)pd, init_val);
185  pd += 2;
186  }
187 
188  if (data_len & 0x1)
189  init_val = rte_hash_crc_1byte(*(const uint8_t *)pd, init_val);
190 
191  return init_val;
192 }
193 
194 #ifdef __cplusplus
195 }
196 #endif
197 
198 #endif /* _RTE_HASH_CRC_H_ */
static uint32_t rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
#define RTE_LOG(l, t,...)
Definition: rte_log.h:340
static uint32_t rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
static uint32_t rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
Definition: rte_hash_crc.h:168
#define RTE_INIT(func)
Definition: rte_common.h:197
static uint32_t rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
static void rte_hash_crc_set_alg(uint8_t alg)
Definition: rte_hash_crc.h:57
__extension__ int rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
static uint32_t rte_hash_crc_4byte(uint32_t data, uint32_t init_val)