Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

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