New upstream version 17.08

[deb_dpdk.git] / lib / librte_table / rte_lru_arm64.h

diff --git a/lib/librte_table/rte_lru_arm64.h b/lib/librte_table/rte_lru_arm64.h
new file mode 100644 (file)
index 0000000..6173523
--- /dev/null
+++ b/lib/librte_table/rte_lru_arm64.h
@@ -0,0 +1,88 @@
+/*
+ *   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