rte_table_hash_func.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2018 Intel Corporation
 */

#ifndef __INCLUDE_RTE_TABLE_HASH_FUNC_H__
#define __INCLUDE_RTE_TABLE_HASH_FUNC_H__

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>

#include <rte_compat.h>
#include <rte_common.h>

static inline uint64_t __rte_experimental
rte_crc32_u64_generic(uint64_t crc, uint64_t value)
{
    int i;

    crc = (crc & 0xFFFFFFFFLLU) ^ value;
    for (i = 63; i >= 0; i--) {
        uint64_t mask;

        mask = -(crc & 1LLU);
        crc = (crc >> 1LLU) ^ (0x82F63B78LLU & mask);
    }

    return crc;
}

#if defined(RTE_ARCH_X86_64)

#include <x86intrin.h>

static inline uint64_t
rte_crc32_u64(uint64_t crc, uint64_t v)
{
    return _mm_crc32_u64(crc, v);
}

#elif defined(RTE_ARCH_ARM64) && defined(RTE_MACHINE_CPUFLAG_CRC32)
#include "rte_table_hash_func_arm64.h"
#else

static inline uint64_t
rte_crc32_u64(uint64_t crc, uint64_t v)
{
    return rte_crc32_u64_generic(crc, v);
}

#endif

static inline uint64_t __rte_experimental
rte_table_hash_crc_key8(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t crc0;

    crc0 = rte_crc32_u64(seed, k[0] & m[0]);

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key16(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, crc0, crc1;

    k0 = k[0] & m[0];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc0 ^= crc1;

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key24(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, k2, crc0, crc1;

    k0 = k[0] & m[0];
    k2 = k[2] & m[2];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc0 = rte_crc32_u64(crc0, k2);

    crc0 ^= crc1;

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key32(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, k2, crc0, crc1, crc2, crc3;

    k0 = k[0] & m[0];
    k2 = k[2] & m[2];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc2 = rte_crc32_u64(k2, k[3] & m[3]);
    crc3 = k2 >> 32;

    crc0 = rte_crc32_u64(crc0, crc1);
    crc1 = rte_crc32_u64(crc2, crc3);

    crc0 ^= crc1;

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key40(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, k2, crc0, crc1, crc2, crc3;

    k0 = k[0] & m[0];
    k2 = k[2] & m[2];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc2 = rte_crc32_u64(k2, k[3] & m[3]);
    crc3 = rte_crc32_u64(k2 >> 32, k[4] & m[4]);

    crc0 = rte_crc32_u64(crc0, crc1);
    crc1 = rte_crc32_u64(crc2, crc3);

    crc0 ^= crc1;

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key48(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, k2, k5, crc0, crc1, crc2, crc3;

    k0 = k[0] & m[0];
    k2 = k[2] & m[2];
    k5 = k[5] & m[5];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc2 = rte_crc32_u64(k2, k[3] & m[3]);
    crc3 = rte_crc32_u64(k2 >> 32, k[4] & m[4]);

    crc0 = rte_crc32_u64(crc0, (crc1 << 32) ^ crc2);
    crc1 = rte_crc32_u64(crc3, k5);

    crc0 ^= crc1;

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key56(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, k2, k5, crc0, crc1, crc2, crc3, crc4, crc5;

    k0 = k[0] & m[0];
    k2 = k[2] & m[2];
    k5 = k[5] & m[5];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc2 = rte_crc32_u64(k2, k[3] & m[3]);
    crc3 = rte_crc32_u64(k2 >> 32, k[4] & m[4]);

    crc4 = rte_crc32_u64(k5, k[6] & m[6]);
    crc5 = k5 >> 32;

    crc0 = rte_crc32_u64(crc0, (crc1 << 32) ^ crc2);
    crc1 = rte_crc32_u64(crc3, (crc4 << 32) ^ crc5);

    crc0 ^= crc1;

    return crc0;
}

static inline uint64_t __rte_experimental
rte_table_hash_crc_key64(void *key, void *mask, __rte_unused uint32_t key_size,
    uint64_t seed)
{
    uint64_t *k = key;
    uint64_t *m = mask;
    uint64_t k0, k2, k5, crc0, crc1, crc2, crc3, crc4, crc5;

    k0 = k[0] & m[0];
    k2 = k[2] & m[2];
    k5 = k[5] & m[5];

    crc0 = rte_crc32_u64(k0, seed);
    crc1 = rte_crc32_u64(k0 >> 32, k[1] & m[1]);

    crc2 = rte_crc32_u64(k2, k[3] & m[3]);
    crc3 = rte_crc32_u64(k2 >> 32, k[4] & m[4]);

    crc4 = rte_crc32_u64(k5, k[6] & m[6]);
    crc5 = rte_crc32_u64(k5 >> 32, k[7] & m[7]);

    crc0 = rte_crc32_u64(crc0, (crc1 << 32) ^ crc2);
    crc1 = rte_crc32_u64(crc3, (crc4 << 32) ^ crc5);

    crc0 ^= crc1;

    return crc0;
}

#ifdef __cplusplus
}
#endif

#endif