9eb0688412
Fix cppcheck warning by marking variable as unsigned. Fixes:dc276b5780
("acl: new library") Fixes:986ff526fb
("net: add CRC computation API") Cc: stable@dpdk.org Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
197 lines
4.0 KiB
C
197 lines
4.0 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
|
|
* Copyright(c) 2017 Intel Corporation
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <string.h>
|
|
#include <stdint.h>
|
|
|
|
#include <rte_cpuflags.h>
|
|
#include <rte_common.h>
|
|
#include <rte_net_crc.h>
|
|
|
|
#if defined(RTE_ARCH_X86_64) && defined(RTE_MACHINE_CPUFLAG_PCLMULQDQ)
|
|
#define X86_64_SSE42_PCLMULQDQ 1
|
|
#elif defined(RTE_ARCH_ARM64) && defined(RTE_MACHINE_CPUFLAG_PMULL)
|
|
#define ARM64_NEON_PMULL 1
|
|
#endif
|
|
|
|
#ifdef X86_64_SSE42_PCLMULQDQ
|
|
#include <net_crc_sse.h>
|
|
#elif defined ARM64_NEON_PMULL
|
|
#include <net_crc_neon.h>
|
|
#endif
|
|
|
|
/* crc tables */
|
|
static uint32_t crc32_eth_lut[CRC_LUT_SIZE];
|
|
static uint32_t crc16_ccitt_lut[CRC_LUT_SIZE];
|
|
|
|
static uint32_t
|
|
rte_crc16_ccitt_handler(const uint8_t *data, uint32_t data_len);
|
|
|
|
static uint32_t
|
|
rte_crc32_eth_handler(const uint8_t *data, uint32_t data_len);
|
|
|
|
typedef uint32_t
|
|
(*rte_net_crc_handler)(const uint8_t *data, uint32_t data_len);
|
|
|
|
static rte_net_crc_handler *handlers;
|
|
|
|
static rte_net_crc_handler handlers_scalar[] = {
|
|
[RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_handler,
|
|
[RTE_NET_CRC32_ETH] = rte_crc32_eth_handler,
|
|
};
|
|
|
|
#ifdef X86_64_SSE42_PCLMULQDQ
|
|
static rte_net_crc_handler handlers_sse42[] = {
|
|
[RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_sse42_handler,
|
|
[RTE_NET_CRC32_ETH] = rte_crc32_eth_sse42_handler,
|
|
};
|
|
#elif defined ARM64_NEON_PMULL
|
|
static rte_net_crc_handler handlers_neon[] = {
|
|
[RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_neon_handler,
|
|
[RTE_NET_CRC32_ETH] = rte_crc32_eth_neon_handler,
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* Reflect the bits about the middle
|
|
*
|
|
* @param val
|
|
* value to be reflected
|
|
*
|
|
* @return
|
|
* reflected value
|
|
*/
|
|
static uint32_t
|
|
reflect_32bits(uint32_t val)
|
|
{
|
|
uint32_t i, res = 0;
|
|
|
|
for (i = 0; i < 32; i++)
|
|
if ((val & (1U << i)) != 0)
|
|
res |= (uint32_t)(1U << (31 - i));
|
|
|
|
return res;
|
|
}
|
|
|
|
static void
|
|
crc32_eth_init_lut(uint32_t poly,
|
|
uint32_t *lut)
|
|
{
|
|
uint32_t i, j;
|
|
|
|
for (i = 0; i < CRC_LUT_SIZE; i++) {
|
|
uint32_t crc = reflect_32bits(i);
|
|
|
|
for (j = 0; j < 8; j++) {
|
|
if (crc & 0x80000000L)
|
|
crc = (crc << 1) ^ poly;
|
|
else
|
|
crc <<= 1;
|
|
}
|
|
lut[i] = reflect_32bits(crc);
|
|
}
|
|
}
|
|
|
|
static __rte_always_inline uint32_t
|
|
crc32_eth_calc_lut(const uint8_t *data,
|
|
uint32_t data_len,
|
|
uint32_t crc,
|
|
const uint32_t *lut)
|
|
{
|
|
while (data_len--)
|
|
crc = lut[(crc ^ *data++) & 0xffL] ^ (crc >> 8);
|
|
|
|
return crc;
|
|
}
|
|
|
|
static void
|
|
rte_net_crc_scalar_init(void)
|
|
{
|
|
/* 32-bit crc init */
|
|
crc32_eth_init_lut(CRC32_ETH_POLYNOMIAL, crc32_eth_lut);
|
|
|
|
/* 16-bit CRC init */
|
|
crc32_eth_init_lut(CRC16_CCITT_POLYNOMIAL << 16, crc16_ccitt_lut);
|
|
}
|
|
|
|
static inline uint32_t
|
|
rte_crc16_ccitt_handler(const uint8_t *data, uint32_t data_len)
|
|
{
|
|
/* return 16-bit CRC value */
|
|
return (uint16_t)~crc32_eth_calc_lut(data,
|
|
data_len,
|
|
0xffff,
|
|
crc16_ccitt_lut);
|
|
}
|
|
|
|
static inline uint32_t
|
|
rte_crc32_eth_handler(const uint8_t *data, uint32_t data_len)
|
|
{
|
|
/* return 32-bit CRC value */
|
|
return ~crc32_eth_calc_lut(data,
|
|
data_len,
|
|
0xffffffffUL,
|
|
crc32_eth_lut);
|
|
}
|
|
|
|
void
|
|
rte_net_crc_set_alg(enum rte_net_crc_alg alg)
|
|
{
|
|
switch (alg) {
|
|
#ifdef X86_64_SSE42_PCLMULQDQ
|
|
case RTE_NET_CRC_SSE42:
|
|
handlers = handlers_sse42;
|
|
break;
|
|
#elif defined ARM64_NEON_PMULL
|
|
/* fall-through */
|
|
case RTE_NET_CRC_NEON:
|
|
if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL)) {
|
|
handlers = handlers_neon;
|
|
break;
|
|
}
|
|
#endif
|
|
/* fall-through */
|
|
case RTE_NET_CRC_SCALAR:
|
|
/* fall-through */
|
|
default:
|
|
handlers = handlers_scalar;
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint32_t
|
|
rte_net_crc_calc(const void *data,
|
|
uint32_t data_len,
|
|
enum rte_net_crc_type type)
|
|
{
|
|
uint32_t ret;
|
|
rte_net_crc_handler f_handle;
|
|
|
|
f_handle = handlers[type];
|
|
ret = f_handle(data, data_len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Select highest available crc algorithm as default one */
|
|
RTE_INIT(rte_net_crc_init)
|
|
{
|
|
enum rte_net_crc_alg alg = RTE_NET_CRC_SCALAR;
|
|
|
|
rte_net_crc_scalar_init();
|
|
|
|
#ifdef X86_64_SSE42_PCLMULQDQ
|
|
alg = RTE_NET_CRC_SSE42;
|
|
rte_net_crc_sse42_init();
|
|
#elif defined ARM64_NEON_PMULL
|
|
if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL)) {
|
|
alg = RTE_NET_CRC_NEON;
|
|
rte_net_crc_neon_init();
|
|
}
|
|
#endif
|
|
|
|
rte_net_crc_set_alg(alg);
|
|
}
|