rte_hash_crc.h File Reference

#include <stdint.h>
#include <rte_cpuflags.h>
#include <rte_branch_prediction.h>
#include <rte_common.h>

Functions
static void	rte_hash_crc_set_alg (uint8_t alg)
static uint32_t	rte_hash_crc_4byte (uint32_t data, uint32_t init_val)
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)

Detailed Description

RTE CRC Hash

Function Documentation

static uint32_t rte_hash_crc ( const void *  data, uint32_t  data_len, uint32_t  init_val  )

inlinestatic

Calculate CRC32 hash on user-supplied byte array.

Parameters

data	Data to perform hash on.
data_len	How many bytes to use to calculate hash value.
init_val	Value to initialise hash generator.

Returns

32bit calculated hash value.

static uint32_t rte_hash_crc_4byte ( uint32_t  data, uint32_t  init_val  )

inlinestatic

Use single crc32 instruction to perform a hash on a 4 byte value. Fall back to software crc32 implementation in case SSE4.2 is not supported

Parameters

data	Data to perform hash on.
init_val	Value to initialise hash generator.

Returns

32bit calculated hash value.

static uint32_t rte_hash_crc_8byte ( uint64_t  data, uint32_t  init_val  )

inlinestatic

Use single crc32 instruction to perform a hash on a 8 byte value. Fall back to software crc32 implementation in case SSE4.2 is not supported

Parameters

data	Data to perform hash on.
init_val	Value to initialise hash generator.

Returns

32bit calculated hash value.

static void rte_hash_crc_set_alg ( uint8_t  alg )

inlinestatic

Allow or disallow use of SSE4.2 instrinsics for CRC32 hash calculation.

Parameters

alg	An OR of following flags: (CRC32_SW) Don't use SSE4.2 intrinsics (CRC32_SSE42) Use SSE4.2 intrinsics if available (CRC32_SSE42_x64) Use 64-bit SSE4.2 intrinsic if available (default)