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Diffstat (limited to 'lib/librte_table/rte_lru.h')
| -rw-r--r-- | lib/librte_table/rte_lru.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/lib/librte_table/rte_lru.h b/lib/librte_table/rte_lru.h new file mode 100644 index 00000000..e87e062d --- /dev/null +++ b/lib/librte_table/rte_lru.h @@ -0,0 +1,213 @@ +/*- + * 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_H__ +#define __INCLUDE_RTE_LRU_H__ + +#ifdef __cplusplus +extern "C" { +#endif + +#include <stdint.h> + +#ifdef __INTEL_COMPILER +#define GCC_VERSION (0) +#else +#define GCC_VERSION (__GNUC__ * 10000+__GNUC_MINOR__*100 + __GNUC_PATCHLEVEL__) +#endif + +#ifndef RTE_TABLE_HASH_LRU_STRATEGY +#ifdef __SSE4_2__ +#define RTE_TABLE_HASH_LRU_STRATEGY 2 +#else /* if no SSE, use simple scalar version */ +#define RTE_TABLE_HASH_LRU_STRATEGY 1 +#endif +#endif + +#ifndef RTE_ARCH_X86_64 +#undef RTE_TABLE_HASH_LRU_STRATEGY +#define RTE_TABLE_HASH_LRU_STRATEGY 1 +#endif + +#if (RTE_TABLE_HASH_LRU_STRATEGY < 0) || (RTE_TABLE_HASH_LRU_STRATEGY > 3) +#error Invalid value for RTE_TABLE_HASH_LRU_STRATEGY +#endif + +#if RTE_TABLE_HASH_LRU_STRATEGY == 0 + +#define lru_init(bucket) \ +do \ + bucket = bucket; \ +while (0) + +#define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU) + +#define lru_update(bucket, mru_val) \ +do { \ + bucket = bucket; \ + mru_val = mru_val; \ +} while (0) + +#elif RTE_TABLE_HASH_LRU_STRATEGY == 1 + +#define lru_init(bucket) \ +do \ + bucket->lru_list = 0x0000000100020003LLU; \ +while (0) + +#define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU) + +#define lru_update(bucket, mru_val) \ +do { \ + uint64_t x, pos, x0, x1, x2, mask; \ + \ + x = bucket->lru_list; \ + \ + pos = 4; \ + if ((x >> 48) == ((uint64_t) mru_val)) \ + pos = 3; \ + \ + if (((x >> 32) & 0xFFFFLLU) == ((uint64_t) mru_val)) \ + pos = 2; \ + \ + if (((x >> 16) & 0xFFFFLLU) == ((uint64_t) mru_val)) \ + pos = 1; \ + \ + if ((x & 0xFFFFLLU) == ((uint64_t) mru_val)) \ + pos = 0; \ + \ + \ + pos <<= 4; \ + mask = (~0LLU) << pos; \ + x0 = x & (~mask); \ + x1 = (x >> 16) & mask; \ + x2 = (x << (48 - pos)) & (0xFFFFLLU << 48); \ + x = x0 | x1 | x2; \ + \ + if (pos != 64) \ + bucket->lru_list = x; \ +} while (0) + +#elif RTE_TABLE_HASH_LRU_STRATEGY == 2 + +#if GCC_VERSION > 40306 +#include <x86intrin.h> +#else +#include <emmintrin.h> +#include <smmintrin.h> +#include <xmmintrin.h> +#endif + +#define lru_init(bucket) \ +do \ + bucket->lru_list = 0x0000000100020003LLU; \ +while (0) + +#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 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 GCC_VERSION > 40306 +#include <x86intrin.h> +#else +#include <emmintrin.h> +#include <smmintrin.h> +#include <xmmintrin.h> +#endif + +#define lru_init(bucket) \ +do \ + bucket->lru_list = ~0LLU; \ +while (0) + + +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) + +#else + +#error "Incorrect value for RTE_TABLE_HASH_LRU_STRATEGY" + +#endif + +#ifdef __cplusplus +} +#endif + +#endif |