rte_hash_crc.h

Go to the documentation of this file.

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef _RTE_HASH_CRC_H_
#define _RTE_HASH_CRC_H_

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

#include <rte_branch_prediction.h>
#include <rte_common.h>
#include <rte_config.h>
#include <rte_cpuflags.h>
#include <rte_log.h>

#include "rte_crc_sw.h"

#define CRC32_SW            (1U << 0)
#define CRC32_SSE42         (1U << 1)
#define CRC32_x64           (1U << 2)
#define CRC32_SSE42_x64     (CRC32_x64|CRC32_SSE42)
#define CRC32_ARM64         (1U << 3)

static uint8_t crc32_alg = CRC32_SW;

#if defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_CRC32)
#include "rte_crc_arm64.h"
#elif defined(RTE_ARCH_X86)
#include "rte_crc_x86.h"
#else
#include "rte_crc_generic.h"
#endif

static inline void
rte_hash_crc_set_alg(uint8_t alg)
{
    crc32_alg = CRC32_SW;

    if (alg == CRC32_SW)
        return;

#if defined RTE_ARCH_X86
    if (!(alg & CRC32_SSE42_x64))
        RTE_LOG(WARNING, HASH,
            "Unsupported CRC32 algorithm requested using CRC32_x64/CRC32_SSE42\n");
    if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T) || alg == CRC32_SSE42)
        crc32_alg = CRC32_SSE42;
    else
        crc32_alg = CRC32_SSE42_x64;
#endif

#if defined RTE_ARCH_ARM64
    if (!(alg & CRC32_ARM64))
        RTE_LOG(WARNING, HASH,
            "Unsupported CRC32 algorithm requested using CRC32_ARM64\n");
    if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
        crc32_alg = CRC32_ARM64;
#endif

    if (crc32_alg == CRC32_SW)
        RTE_LOG(WARNING, HASH,
            "Unsupported CRC32 algorithm requested using CRC32_SW\n");
}

/* Setting the best available algorithm */
RTE_INIT(rte_hash_crc_init_alg)
{
#if defined(RTE_ARCH_X86)
    rte_hash_crc_set_alg(CRC32_SSE42_x64);
#elif defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_CRC32)
    rte_hash_crc_set_alg(CRC32_ARM64);
#else
    rte_hash_crc_set_alg(CRC32_SW);
#endif
}

#ifdef __DOXYGEN__

static inline uint32_t
rte_hash_crc_1byte(uint8_t data, uint32_t init_val);

static inline uint32_t
rte_hash_crc_2byte(uint16_t data, uint32_t init_val);

static inline uint32_t
rte_hash_crc_4byte(uint32_t data, uint32_t init_val);

static inline uint32_t
rte_hash_crc_8byte(uint64_t data, uint32_t init_val);

#endif /* __DOXYGEN__ */

static inline uint32_t
rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
{
    unsigned i;
    uintptr_t pd = (uintptr_t) data;

    for (i = 0; i < data_len / 8; i++) {
        init_val = rte_hash_crc_8byte(*(const uint64_t *)pd, init_val);
        pd += 8;
    }

    if (data_len & 0x4) {
        init_val = rte_hash_crc_4byte(*(const uint32_t *)pd, init_val);
        pd += 4;
    }

    if (data_len & 0x2) {
        init_val = rte_hash_crc_2byte(*(const uint16_t *)pd, init_val);
        pd += 2;
    }

    if (data_len & 0x1)
        init_val = rte_hash_crc_1byte(*(const uint8_t *)pd, init_val);

    return init_val;
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_HASH_CRC_H_ */