1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2010-2014 Intel Corporation 3 */ 4 5 #ifndef __INCLUDE_RTE_LRU_X86_H__ 6 #define __INCLUDE_RTE_LRU_X86_H__ 7 8 #ifdef __cplusplus 9 extern "C" { 10 #endif 11 12 #include <stdint.h> 13 14 #include <rte_config.h> 15 #include <rte_common.h> 16 17 #ifndef RTE_TABLE_HASH_LRU_STRATEGY 18 #define RTE_TABLE_HASH_LRU_STRATEGY 2 19 #endif 20 21 #if RTE_TABLE_HASH_LRU_STRATEGY == 2 22 23 #if RTE_CC_IS_GNU && (GCC_VERSION > 40306) 24 #include <x86intrin.h> 25 #else 26 #include <emmintrin.h> 27 #include <smmintrin.h> 28 #include <xmmintrin.h> 29 #endif 30 31 #define lru_init(bucket) \ 32 { bucket->lru_list = 0x0000000100020003LLU; } 33 34 #define lru_pos(bucket) (bucket->lru_list & 0xFFFFLLU) 35 36 #define lru_update(bucket, mru_val) \ 37 do { \ 38 /* set up the masks for all possible shuffles, depends on pos */\ 39 static uint64_t masks[10] = { \ 40 /* Shuffle order; Make Zero (see _mm_shuffle_epi8 manual) */\ 41 0x0100070605040302, 0x8080808080808080, \ 42 0x0302070605040100, 0x8080808080808080, \ 43 0x0504070603020100, 0x8080808080808080, \ 44 0x0706050403020100, 0x8080808080808080, \ 45 0x0706050403020100, 0x8080808080808080}; \ 46 /* load up one register with repeats of mru-val */ \ 47 uint64_t mru2 = mru_val; \ 48 uint64_t mru3 = mru2 | (mru2 << 16); \ 49 uint64_t lru = bucket->lru_list; \ 50 /* XOR to cause the word we're looking for to go to zero */ \ 51 uint64_t mru = lru ^ ((mru3 << 32) | mru3); \ 52 __m128i c = _mm_cvtsi64_si128(mru); \ 53 __m128i b = _mm_cvtsi64_si128(lru); \ 54 /* Find the minimum value (first zero word, if it's in there) */\ 55 __m128i d = _mm_minpos_epu16(c); \ 56 /* Second word is the index to found word (first word is the value) */\ 57 unsigned int pos = _mm_extract_epi16(d, 1); \ 58 /* move the recently used location to top of list */ \ 59 __m128i k = _mm_shuffle_epi8(b, *((__m128i *) &masks[2 * pos]));\ 60 /* Finally, update the original list with the reordered data */ \ 61 bucket->lru_list = _mm_extract_epi64(k, 0); \ 62 /* Phwew! */ \ 63 } while (0) 64 65 #elif RTE_TABLE_HASH_LRU_STRATEGY == 3 66 67 #if RTE_CC_IS_GNU && (GCC_VERSION > 40306) 68 #include <x86intrin.h> 69 #else 70 #include <emmintrin.h> 71 #include <smmintrin.h> 72 #include <xmmintrin.h> 73 #endif 74 75 #define lru_init(bucket) \ 76 { bucket->lru_list = ~0LLU; } 77 78 static inline int 79 f_lru_pos(uint64_t lru_list) 80 { 81 __m128i lst = _mm_set_epi64x((uint64_t)-1, lru_list); 82 __m128i min = _mm_minpos_epu16(lst); 83 return _mm_extract_epi16(min, 1); 84 } 85 #define lru_pos(bucket) f_lru_pos(bucket->lru_list) 86 87 #define lru_update(bucket, mru_val) \ 88 do { \ 89 const uint64_t orvals[] = {0xFFFFLLU, 0xFFFFLLU << 16, \ 90 0xFFFFLLU << 32, 0xFFFFLLU << 48, 0LLU}; \ 91 const uint64_t decs[] = {0x1000100010001LLU, 0}; \ 92 __m128i lru = _mm_cvtsi64_si128(bucket->lru_list); \ 93 __m128i vdec = _mm_cvtsi64_si128(decs[mru_val>>2]); \ 94 lru = _mm_subs_epu16(lru, vdec); \ 95 bucket->lru_list = _mm_extract_epi64(lru, 0) | orvals[mru_val]; \ 96 } while (0) 97 98 #endif 99 100 #ifdef __cplusplus 101 } 102 #endif 103 104 #endif 105