--- /dev/null
+/*-
+ * 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
Code Review / deb_dpdk.git / blobdiff