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38 #include <rte_cpuflags.h>
39 #include <rte_common.h>
40 #include <rte_net_crc.h>
42 #if defined(RTE_ARCH_X86_64) \
43 && defined(RTE_MACHINE_CPUFLAG_SSE4_2) \
44 && defined(RTE_MACHINE_CPUFLAG_PCLMULQDQ)
45 #define X86_64_SSE42_PCLMULQDQ 1
48 #ifdef X86_64_SSE42_PCLMULQDQ
49 #include <net_crc_sse.h>
53 static uint32_t crc32_eth_lut[CRC_LUT_SIZE];
54 static uint32_t crc16_ccitt_lut[CRC_LUT_SIZE];
57 rte_crc16_ccitt_handler(const uint8_t *data, uint32_t data_len);
60 rte_crc32_eth_handler(const uint8_t *data, uint32_t data_len);
63 (*rte_net_crc_handler)(const uint8_t *data, uint32_t data_len);
65 static rte_net_crc_handler *handlers;
67 static rte_net_crc_handler handlers_scalar[] = {
68 [RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_handler,
69 [RTE_NET_CRC32_ETH] = rte_crc32_eth_handler,
72 #ifdef X86_64_SSE42_PCLMULQDQ
73 static rte_net_crc_handler handlers_sse42[] = {
74 [RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_sse42_handler,
75 [RTE_NET_CRC32_ETH] = rte_crc32_eth_sse42_handler,
80 * Reflect the bits about the middle
83 * value to be reflected
89 reflect_32bits(uint32_t val)
93 for (i = 0; i < 32; i++)
94 if ((val & (1 << i)) != 0)
95 res |= (uint32_t)(1 << (31 - i));
101 crc32_eth_init_lut(uint32_t poly,
106 for (i = 0; i < CRC_LUT_SIZE; i++) {
107 uint32_t crc = reflect_32bits(i);
109 for (j = 0; j < 8; j++) {
110 if (crc & 0x80000000L)
111 crc = (crc << 1) ^ poly;
115 lut[i] = reflect_32bits(crc);
119 static __rte_always_inline uint32_t
120 crc32_eth_calc_lut(const uint8_t *data,
126 crc = lut[(crc ^ *data++) & 0xffL] ^ (crc >> 8);
132 rte_net_crc_scalar_init(void)
134 /* 32-bit crc init */
135 crc32_eth_init_lut(CRC32_ETH_POLYNOMIAL, crc32_eth_lut);
137 /* 16-bit CRC init */
138 crc32_eth_init_lut(CRC16_CCITT_POLYNOMIAL << 16, crc16_ccitt_lut);
141 static inline uint32_t
142 rte_crc16_ccitt_handler(const uint8_t *data, uint32_t data_len)
144 /* return 16-bit CRC value */
145 return (uint16_t)~crc32_eth_calc_lut(data,
151 static inline uint32_t
152 rte_crc32_eth_handler(const uint8_t *data, uint32_t data_len)
154 /* return 32-bit CRC value */
155 return ~crc32_eth_calc_lut(data,
162 rte_net_crc_set_alg(enum rte_net_crc_alg alg)
165 case RTE_NET_CRC_SSE42:
166 #ifdef X86_64_SSE42_PCLMULQDQ
167 handlers = handlers_sse42;
169 alg = RTE_NET_CRC_SCALAR;
172 case RTE_NET_CRC_SCALAR:
174 handlers = handlers_scalar;
180 rte_net_crc_calc(const void *data,
182 enum rte_net_crc_type type)
185 rte_net_crc_handler f_handle;
187 f_handle = handlers[type];
188 ret = f_handle(data, data_len);
193 /* Select highest available crc algorithm as default one */
194 static inline void __attribute__((constructor))
195 rte_net_crc_init(void)
197 enum rte_net_crc_alg alg = RTE_NET_CRC_SCALAR;
199 rte_net_crc_scalar_init();
201 #ifdef X86_64_SSE42_PCLMULQDQ
202 alg = RTE_NET_CRC_SSE42;
203 rte_net_crc_sse42_init();
206 rte_net_crc_set_alg(alg);