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authorLuca Boccassi <luca.boccassi@gmail.com>2017-08-16 18:42:05 +0100
committerLuca Boccassi <luca.boccassi@gmail.com>2017-08-16 18:46:04 +0100
commitf239aed5e674965691846e8ce3f187dd47523689 (patch)
treea153a3125c6e183c73871a8ecaa4b285fed5fbd5 /lib/librte_table/rte_lru_arm64.h
parentbf7567fd2a5b0b28ab724046143c24561d38d015 (diff)
New upstream version 17.08
Change-Id: I288b50990f52646089d6b1f3aaa6ba2f091a51d7 Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>
Diffstat (limited to 'lib/librte_table/rte_lru_arm64.h')
-rw-r--r--lib/librte_table/rte_lru_arm64.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/lib/librte_table/rte_lru_arm64.h b/lib/librte_table/rte_lru_arm64.h
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+/*
+ * BSD LICENSE
+ *
+ * Copyright (C) Cavium, Inc. 2017.
+ *
+ * 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 Cavium, Inc 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 __RTE_LRU_ARM64_H__
+#define __RTE_LRU_ARM64_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <rte_vect.h>
+
+#ifndef RTE_TABLE_HASH_LRU_STRATEGY
+#ifdef RTE_MACHINE_CPUFLAG_NEON
+#define RTE_TABLE_HASH_LRU_STRATEGY 3
+#else /* if no NEON, use simple scalar version */
+#define RTE_TABLE_HASH_LRU_STRATEGY 1
+#endif
+#endif
+
+#if RTE_TABLE_HASH_LRU_STRATEGY == 3
+
+#define lru_init(bucket) \
+ { bucket->lru_list = ~0LLU; }
+
+static inline int
+f_lru_pos(uint64_t lru_list)
+{
+ /* Compare the vector to zero vector */
+ uint16x4_t lru_vec = vld1_u16((uint16_t *)&lru_list);
+ uint16x4_t min_vec = vmov_n_u16(vminv_u16(lru_vec));
+ uint64_t mask = vget_lane_u64(vreinterpret_u64_u16(
+ vceq_u16(min_vec, lru_vec)), 0);
+ return __builtin_clzl(mask) >> 4;
+}
+#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}; \
+ uint64x1_t lru = vdup_n_u64(bucket->lru_list); \
+ uint64x1_t vdec = vdup_n_u64(decs[mru_val>>2]); \
+ bucket->lru_list = vget_lane_u64(vreinterpret_u64_u16( \
+ vsub_u16(vreinterpret_u16_u64(lru), \
+ vreinterpret_u16_u64(vdec))), \
+ 0); \
+ bucket->lru_list |= orvals[mru_val]; \
+} while (0)
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif