1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2015 Cavium, Inc 3 */ 4 5 #ifndef _RTE_CRC_ARM64_H_ 6 #define _RTE_CRC_ARM64_H_ 7 8 /** 9 * @file 10 * 11 * RTE CRC arm64 Hash 12 */ 13 14 #ifdef __cplusplus 15 extern "C" { 16 #endif 17 18 #include <stdint.h> 19 #include <rte_cpuflags.h> 20 #include <rte_branch_prediction.h> 21 #include <rte_common.h> 22 23 static inline uint32_t 24 crc32c_arm64_u8(uint8_t data, uint32_t init_val) 25 { 26 __asm__ volatile( 27 "crc32cb %w[crc], %w[crc], %w[value]" 28 : [crc] "+r" (init_val) 29 : [value] "r" (data)); 30 return init_val; 31 } 32 33 static inline uint32_t 34 crc32c_arm64_u16(uint16_t data, uint32_t init_val) 35 { 36 __asm__ volatile( 37 "crc32ch %w[crc], %w[crc], %w[value]" 38 : [crc] "+r" (init_val) 39 : [value] "r" (data)); 40 return init_val; 41 } 42 43 static inline uint32_t 44 crc32c_arm64_u32(uint32_t data, uint32_t init_val) 45 { 46 __asm__ volatile( 47 "crc32cw %w[crc], %w[crc], %w[value]" 48 : [crc] "+r" (init_val) 49 : [value] "r" (data)); 50 return init_val; 51 } 52 53 static inline uint32_t 54 crc32c_arm64_u64(uint64_t data, uint32_t init_val) 55 { 56 __asm__ volatile( 57 "crc32cx %w[crc], %w[crc], %x[value]" 58 : [crc] "+r" (init_val) 59 : [value] "r" (data)); 60 return init_val; 61 } 62 63 /** 64 * Allow or disallow use of arm64 SIMD instrinsics for CRC32 hash 65 * calculation. 66 * 67 * @param alg 68 * An OR of following flags: 69 * - (CRC32_SW) Don't use arm64 crc intrinsics 70 * - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available 71 * 72 */ 73 static inline void 74 rte_hash_crc_set_alg(uint8_t alg) 75 { 76 switch (alg) { 77 case CRC32_ARM64: 78 if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32)) 79 alg = CRC32_SW; 80 /* fall-through */ 81 case CRC32_SW: 82 crc32_alg = alg; 83 /* fall-through */ 84 default: 85 break; 86 } 87 } 88 89 /* Setting the best available algorithm */ 90 RTE_INIT(rte_hash_crc_init_alg) 91 { 92 rte_hash_crc_set_alg(CRC32_ARM64); 93 } 94 95 /** 96 * Use single crc32 instruction to perform a hash on a 1 byte value. 97 * Fall back to software crc32 implementation in case arm64 crc intrinsics is 98 * not supported 99 * 100 * @param data 101 * Data to perform hash on. 102 * @param init_val 103 * Value to initialise hash generator. 104 * @return 105 * 32bit calculated hash value. 106 */ 107 static inline uint32_t 108 rte_hash_crc_1byte(uint8_t data, uint32_t init_val) 109 { 110 if (likely(crc32_alg & CRC32_ARM64)) 111 return crc32c_arm64_u8(data, init_val); 112 113 return crc32c_1byte(data, init_val); 114 } 115 116 /** 117 * Use single crc32 instruction to perform a hash on a 2 bytes value. 118 * Fall back to software crc32 implementation in case arm64 crc intrinsics is 119 * not supported 120 * 121 * @param data 122 * Data to perform hash on. 123 * @param init_val 124 * Value to initialise hash generator. 125 * @return 126 * 32bit calculated hash value. 127 */ 128 static inline uint32_t 129 rte_hash_crc_2byte(uint16_t data, uint32_t init_val) 130 { 131 if (likely(crc32_alg & CRC32_ARM64)) 132 return crc32c_arm64_u16(data, init_val); 133 134 return crc32c_2bytes(data, init_val); 135 } 136 137 /** 138 * Use single crc32 instruction to perform a hash on a 4 byte value. 139 * Fall back to software crc32 implementation in case arm64 crc intrinsics is 140 * not supported 141 * 142 * @param data 143 * Data to perform hash on. 144 * @param init_val 145 * Value to initialise hash generator. 146 * @return 147 * 32bit calculated hash value. 148 */ 149 static inline uint32_t 150 rte_hash_crc_4byte(uint32_t data, uint32_t init_val) 151 { 152 if (likely(crc32_alg & CRC32_ARM64)) 153 return crc32c_arm64_u32(data, init_val); 154 155 return crc32c_1word(data, init_val); 156 } 157 158 /** 159 * Use single crc32 instruction to perform a hash on a 8 byte value. 160 * Fall back to software crc32 implementation in case arm64 crc intrinsics is 161 * not supported 162 * 163 * @param data 164 * Data to perform hash on. 165 * @param init_val 166 * Value to initialise hash generator. 167 * @return 168 * 32bit calculated hash value. 169 */ 170 static inline uint32_t 171 rte_hash_crc_8byte(uint64_t data, uint32_t init_val) 172 { 173 if (likely(crc32_alg == CRC32_ARM64)) 174 return crc32c_arm64_u64(data, init_val); 175 176 return crc32c_2words(data, init_val); 177 } 178 179 #ifdef __cplusplus 180 } 181 #endif 182 183 #endif /* _RTE_CRC_ARM64_H_ */ 184