rte_crc_arm64.h

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/*-
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 *
 *   Copyright(c) 2015 Cavium, Inc. All rights reserved.
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 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
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 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
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#ifndef _RTE_CRC_ARM64_H_
#define _RTE_CRC_ARM64_H_

#ifdef __cplusplus
extern "C" {
#endif

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

static inline uint32_t
crc32c_arm64_u8(uint8_t data, uint32_t init_val)
{
        __asm__ volatile(
                        "crc32cb %w[crc], %w[crc], %w[value]"
                        : [crc] "+r" (init_val)
                        : [value] "r" (data));
        return init_val;
}

static inline uint32_t
crc32c_arm64_u16(uint16_t data, uint32_t init_val)
{
        __asm__ volatile(
                        "crc32ch %w[crc], %w[crc], %w[value]"
                        : [crc] "+r" (init_val)
                        : [value] "r" (data));
        return init_val;
}

static inline uint32_t
crc32c_arm64_u32(uint32_t data, uint32_t init_val)
{
        __asm__ volatile(
                        "crc32cw %w[crc], %w[crc], %w[value]"
                        : [crc] "+r" (init_val)
                        : [value] "r" (data));
        return init_val;
}

static inline uint32_t
crc32c_arm64_u64(uint64_t data, uint32_t init_val)
{
        __asm__ volatile(
                        "crc32cx %w[crc], %w[crc], %x[value]"
                        : [crc] "+r" (init_val)
                        : [value] "r" (data));
        return init_val;
}

static inline void
rte_hash_crc_set_alg(uint8_t alg)
{
        switch (alg) {
        case CRC32_ARM64:
                if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
                        alg = CRC32_SW;
                /* fall-through */
        case CRC32_SW:
                crc32_alg = alg;
                /* fall-through */
        default:
                break;
        }
}

/* Setting the best available algorithm */
static inline void __attribute__((constructor))
rte_hash_crc_init_alg(void)
{
        rte_hash_crc_set_alg(CRC32_ARM64);
}

static inline uint32_t
rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
{
        if (likely(crc32_alg & CRC32_ARM64))
                return crc32c_arm64_u8(data, init_val);

        return crc32c_1byte(data, init_val);
}

static inline uint32_t
rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
{
        if (likely(crc32_alg & CRC32_ARM64))
                return crc32c_arm64_u16(data, init_val);

        return crc32c_2bytes(data, init_val);
}

static inline uint32_t
rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
{
        if (likely(crc32_alg & CRC32_ARM64))
                return crc32c_arm64_u32(data, init_val);

        return crc32c_1word(data, init_val);
}

static inline uint32_t
rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
{
        if (likely(crc32_alg == CRC32_ARM64))
                return crc32c_arm64_u64(data, init_val);

        return crc32c_2words(data, init_val);
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_CRC_ARM64_H_ */