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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* 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.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __INCLUDE_RTE_LRU_X86_H__
#define __INCLUDE_RTE_LRU_X86_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include <rte_config.h>
#ifndef RTE_TABLE_HASH_LRU_STRATEGY
#define RTE_TABLE_HASH_LRU_STRATEGY 2
#endif
#if RTE_TABLE_HASH_LRU_STRATEGY == 2
#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION > 40306)
#include <x86intrin.h>
#else
#include <emmintrin.h>
#include <smmintrin.h>
#include <xmmintrin.h>
#endif
#define lru_init(bucket) \
{ bucket->lru_list = 0x0000000100020003LLU; }
#define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU)
#define lru_update(bucket, mru_val) \
do { \
/* set up the masks for all possible shuffles, depends on pos */\
static uint64_t masks[10] = { \
/* Shuffle order; Make Zero (see _mm_shuffle_epi8 manual) */\
0x0100070605040302, 0x8080808080808080, \
0x0302070605040100, 0x8080808080808080, \
0x0504070603020100, 0x8080808080808080, \
0x0706050403020100, 0x8080808080808080, \
0x0706050403020100, 0x8080808080808080}; \
/* load up one register with repeats of mru-val */ \
uint64_t mru2 = mru_val; \
uint64_t mru3 = mru2 | (mru2 << 16); \
uint64_t lru = bucket->lru_list; \
/* XOR to cause the word we're looking for to go to zero */ \
uint64_t mru = lru ^ ((mru3 << 32) | mru3); \
__m128i c = _mm_cvtsi64_si128(mru); \
__m128i b = _mm_cvtsi64_si128(lru); \
/* Find the minimum value (first zero word, if it's in there) */\
__m128i d = _mm_minpos_epu16(c); \
/* Second word is the index to found word (first word is the value) */\
unsigned int pos = _mm_extract_epi16(d, 1); \
/* move the recently used location to top of list */ \
__m128i k = _mm_shuffle_epi8(b, *((__m128i *) &masks[2 * pos]));\
/* Finally, update the original list with the reordered data */ \
bucket->lru_list = _mm_extract_epi64(k, 0); \
/* Phwew! */ \
} while (0)
#elif RTE_TABLE_HASH_LRU_STRATEGY == 3
#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION > 40306)
#include <x86intrin.h>
#else
#include <emmintrin.h>
#include <smmintrin.h>
#include <xmmintrin.h>
#endif
#define lru_init(bucket) \
{ bucket->lru_list = ~0LLU; }
static inline int
f_lru_pos(uint64_t lru_list)
{
__m128i lst = _mm_set_epi64x((uint64_t)-1, lru_list);
__m128i min = _mm_minpos_epu16(lst);
return _mm_extract_epi16(min, 1);
}
#define lru_pos(bucket) f_lru_pos(bucket->lru_list)
#define lru_update(bucket, mru_val) \
do { \
const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16, \
0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU}; \
const uint64_t decs[] = {0x1000100010001LLU, 0}; \
__m128i lru = _mm_cvtsi64_si128(bucket->lru_list); \
__m128i vdec = _mm_cvtsi64_si128(decs[mru_val>>2]); \
lru = _mm_subs_epu16(lru, vdec); \
bucket->lru_list = _mm_extract_epi64(lru, 0) | orvals[mru_val]; \
} while (0)
#endif
#ifdef __cplusplus
}
#endif
#endif
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