ceph/src/dpdk/lib/librte_hash/rte_crc_arm64.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2015 Cavium networks. 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 Cavium networks 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 _RTE_CRC_ARM64_H_
  35 #define _RTE_CRC_ARM64_H_
  36
  37 /**
  38  * @file
  39  *
  40  * RTE CRC arm64 Hash
  41  */
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 #include <stdint.h>
  48 #include <rte_cpuflags.h>
  49 #include <rte_branch_prediction.h>
  50 #include <rte_common.h>
  51
  52 static inline uint32_t
  53 crc32c_arm64_u8(uint8_t data, uint32_t init_val)
  54 {
  55         asm(".arch armv8-a+crc");
  56         __asm__ volatile(
  57                         "crc32cb %w[crc], %w[crc], %w[value]"
  58                         : [crc] "+r" (init_val)
  59                         : [value] "r" (data));
  60         return init_val;
  61 }
  62
  63 static inline uint32_t
  64 crc32c_arm64_u16(uint16_t data, uint32_t init_val)
  65 {
  66         asm(".arch armv8-a+crc");
  67         __asm__ volatile(
  68                         "crc32ch %w[crc], %w[crc], %w[value]"
  69                         : [crc] "+r" (init_val)
  70                         : [value] "r" (data));
  71         return init_val;
  72 }
  73
  74 static inline uint32_t
  75 crc32c_arm64_u32(uint32_t data, uint32_t init_val)
  76 {
  77         asm(".arch armv8-a+crc");
  78         __asm__ volatile(
  79                         "crc32cw %w[crc], %w[crc], %w[value]"
  80                         : [crc] "+r" (init_val)
  81                         : [value] "r" (data));
  82         return init_val;
  83 }
  84
  85 static inline uint32_t
  86 crc32c_arm64_u64(uint64_t data, uint32_t init_val)
  87 {
  88         asm(".arch armv8-a+crc");
  89         __asm__ volatile(
  90                         "crc32cx %w[crc], %w[crc], %x[value]"
  91                         : [crc] "+r" (init_val)
  92                         : [value] "r" (data));
  93         return init_val;
  94 }
  95
  96 /**
  97  * Allow or disallow use of arm64 SIMD instrinsics for CRC32 hash
  98  * calculation.
  99  *
 100  * @param alg
 101  *   An OR of following flags:
 102  *   - (CRC32_SW) Don't use arm64 crc intrinsics
 103  *   - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available
 104  *
 105  */
 106 static inline void
 107 rte_hash_crc_set_alg(uint8_t alg)
 108 {
 109         switch (alg) {
 110         case CRC32_ARM64:
 111                 if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
 112                         alg = CRC32_SW;
 113         case CRC32_SW:
 114                 crc32_alg = alg;
 115         default:
 116                 break;
 117         }
 118 }
 119
 120 /* Setting the best available algorithm */
 121 static inline void __attribute__((constructor))
 122 rte_hash_crc_init_alg(void)
 123 {
 124         rte_hash_crc_set_alg(CRC32_ARM64);
 125 }
 126
 127 /**
 128  * Use single crc32 instruction to perform a hash on a 1 byte value.
 129  * Fall back to software crc32 implementation in case arm64 crc intrinsics is
 130  * not supported
 131  *
 132  * @param data
 133  *   Data to perform hash on.
 134  * @param init_val
 135  *   Value to initialise hash generator.
 136  * @return
 137  *   32bit calculated hash value.
 138  */
 139 static inline uint32_t
 140 rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
 141 {
 142         if (likely(crc32_alg & CRC32_ARM64))
 143                 return crc32c_arm64_u8(data, init_val);
 144
 145         return crc32c_1byte(data, init_val);
 146 }
 147
 148 /**
 149  * Use single crc32 instruction to perform a hash on a 2 bytes value.
 150  * Fall back to software crc32 implementation in case arm64 crc intrinsics is
 151  * not supported
 152  *
 153  * @param data
 154  *   Data to perform hash on.
 155  * @param init_val
 156  *   Value to initialise hash generator.
 157  * @return
 158  *   32bit calculated hash value.
 159  */
 160 static inline uint32_t
 161 rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
 162 {
 163         if (likely(crc32_alg & CRC32_ARM64))
 164                 return crc32c_arm64_u16(data, init_val);
 165
 166         return crc32c_2bytes(data, init_val);
 167 }
 168
 169 /**
 170  * Use single crc32 instruction to perform a hash on a 4 byte value.
 171  * Fall back to software crc32 implementation in case arm64 crc intrinsics is
 172  * not supported
 173  *
 174  * @param data
 175  *   Data to perform hash on.
 176  * @param init_val
 177  *   Value to initialise hash generator.
 178  * @return
 179  *   32bit calculated hash value.
 180  */
 181 static inline uint32_t
 182 rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
 183 {
 184         if (likely(crc32_alg & CRC32_ARM64))
 185                 return crc32c_arm64_u32(data, init_val);
 186
 187         return crc32c_1word(data, init_val);
 188 }
 189
 190 /**
 191  * Use single crc32 instruction to perform a hash on a 8 byte value.
 192  * Fall back to software crc32 implementation in case arm64 crc intrinsics is
 193  * not supported
 194  *
 195  * @param data
 196  *   Data to perform hash on.
 197  * @param init_val
 198  *   Value to initialise hash generator.
 199  * @return
 200  *   32bit calculated hash value.
 201  */
 202 static inline uint32_t
 203 rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
 204 {
 205         if (likely(crc32_alg == CRC32_ARM64))
 206                 return crc32c_arm64_u64(data, init_val);
 207
 208         return crc32c_2words(data, init_val);
 209 }
 210
 211 #ifdef __cplusplus
 212 }
 213 #endif
 214
 215 #endif /* _RTE_CRC_ARM64_H_ */