--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2015 Cavium networks. 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 Cavium networks 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_CRC_ARM64_H_
+#define _RTE_CRC_ARM64_H_
+
+/**
+ * @file
+ *
+ * RTE CRC arm64 Hash
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <rte_cpuflags.h>
+#include <rte_branch_prediction.h>
+#include <rte_common.h>
+
+static inline uint32_t
+crc32c_arm64_u32(uint32_t data, uint32_t init_val)
+{
+ asm(".arch armv8-a+crc");
+ __asm__ volatile(
+ "crc32cw %w[crc], %w[crc], %w[value]"
+ : [crc] "+r" (init_val)
+ : [value] "r" (data));
+ return init_val;
+}
+
+static inline uint32_t
+crc32c_arm64_u64(uint64_t data, uint32_t init_val)
+{
+ asm(".arch armv8-a+crc");
+ __asm__ volatile(
+ "crc32cx %w[crc], %w[crc], %x[value]"
+ : [crc] "+r" (init_val)
+ : [value] "r" (data));
+ return init_val;
+}
+
+/**
+ * Allow or disallow use of arm64 SIMD instrinsics for CRC32 hash
+ * calculation.
+ *
+ * @param alg
+ * An OR of following flags:
+ * - (CRC32_SW) Don't use arm64 crc intrinsics
+ * - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available
+ *
+ */
+static inline void
+rte_hash_crc_set_alg(uint8_t alg)
+{
+ switch (alg) {
+ case CRC32_ARM64:
+ if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
+ alg = CRC32_SW;
+ case CRC32_SW:
+ crc32_alg = alg;
+ default:
+ break;
+ }
+}
+
+/* Setting the best available algorithm */
+static inline void __attribute__((constructor))
+rte_hash_crc_init_alg(void)
+{
+ rte_hash_crc_set_alg(CRC32_ARM64);
+}
+
+/**
+ * Use single crc32 instruction to perform a hash on a 4 byte value.
+ * Fall back to software crc32 implementation in case arm64 crc intrinsics is
+ * not supported
+ *
+ * @param data
+ * Data to perform hash on.
+ * @param init_val
+ * Value to initialise hash generator.
+ * @return
+ * 32bit calculated hash value.
+ */
+static inline uint32_t
+rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
+{
+ if (likely(crc32_alg & CRC32_ARM64))
+ return crc32c_arm64_u32(data, init_val);
+
+ return crc32c_1word(data, init_val);
+}
+
+/**
+ * Use single crc32 instruction to perform a hash on a 8 byte value.
+ * Fall back to software crc32 implementation in case arm64 crc intrinsics is
+ * not supported
+ *
+ * @param data
+ * Data to perform hash on.
+ * @param init_val
+ * Value to initialise hash generator.
+ * @return
+ * 32bit calculated hash value.
+ */
+static inline uint32_t
+rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
+{
+ if (likely(crc32_alg == CRC32_ARM64))
+ return crc32c_arm64_u64(data, init_val);
+
+ return crc32c_2words(data, init_val);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_CRC_ARM64_H_ */
git.droids-corp.org / dpdk.git / commitdiff