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