-/*-
- * 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.
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
*/
#ifndef _RTE_HASH_CRC_H_
#endif
#include <stdint.h>
+#include <rte_config.h>
#include <rte_cpuflags.h>
#include <rte_branch_prediction.h>
#include <rte_common.h>
(crc32c_tables[(n)][(crc) & 0xFF] ^ \
crc32c_tables[(n)-1][((crc) >> 8) & 0xFF])
+static inline uint32_t
+crc32c_1byte(uint8_t data, uint32_t init_val)
+{
+ uint32_t crc;
+ crc = init_val;
+ crc ^= data;
+
+ return crc32c_tables[0][crc & 0xff] ^ (crc >> 8);
+}
+
+static inline uint32_t
+crc32c_2bytes(uint16_t data, uint32_t init_val)
+{
+ uint32_t crc;
+ crc = init_val;
+ crc ^= data;
+
+ crc = CRC32_UPD(crc, 1) ^ (crc >> 16);
+
+ return crc;
+}
+
static inline uint32_t
crc32c_1word(uint32_t data, uint32_t init_val)
{
return crc;
}
-#if defined(RTE_ARCH_I686) || defined(RTE_ARCH_X86_64)
+#if defined(RTE_ARCH_X86)
+static inline uint32_t
+crc32c_sse42_u8(uint8_t data, uint32_t init_val)
+{
+ __asm__ volatile(
+ "crc32b %[data], %[init_val];"
+ : [init_val] "+r" (init_val)
+ : [data] "rm" (data));
+ return init_val;
+}
+
+static inline uint32_t
+crc32c_sse42_u16(uint16_t data, uint32_t init_val)
+{
+ __asm__ volatile(
+ "crc32w %[data], %[init_val];"
+ : [init_val] "+r" (init_val)
+ : [data] "rm" (data));
+ return init_val;
+}
+
static inline uint32_t
crc32c_sse42_u32(uint32_t data, uint32_t init_val)
{
#define CRC32_SSE42 (1U << 1)
#define CRC32_x64 (1U << 2)
#define CRC32_SSE42_x64 (CRC32_x64|CRC32_SSE42)
+#define CRC32_ARM64 (1U << 3)
static uint8_t crc32_alg = CRC32_SW;
+#if defined(RTE_ARCH_ARM64) && defined(RTE_MACHINE_CPUFLAG_CRC32)
+#include "rte_crc_arm64.h"
+#else
+
/**
* Allow or disallow use of SSE4.2 instrinsics for CRC32 hash
* calculation.
static inline void
rte_hash_crc_set_alg(uint8_t alg)
{
- switch (alg) {
- case CRC32_SSE42_x64:
- if (! rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
- alg = CRC32_SSE42;
- case CRC32_SSE42:
- if (! rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE4_2))
- alg = CRC32_SW;
- case CRC32_SW:
- crc32_alg = alg;
- default:
- break;
- }
+#if defined(RTE_ARCH_X86)
+ if (alg == CRC32_SSE42_x64 &&
+ !rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
+ alg = CRC32_SSE42;
+#endif
+ crc32_alg = alg;
}
/* Setting the best available algorithm */
-static inline void __attribute__((constructor))
-rte_hash_crc_init_alg(void)
+RTE_INIT(rte_hash_crc_init_alg)
{
rte_hash_crc_set_alg(CRC32_SSE42_x64);
}
+/**
+ * Use single crc32 instruction to perform a hash on a byte value.
+ * Fall back to software crc32 implementation in case SSE4.2 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_1byte(uint8_t data, uint32_t init_val)
+{
+#if defined RTE_ARCH_X86
+ if (likely(crc32_alg & CRC32_SSE42))
+ return crc32c_sse42_u8(data, init_val);
+#endif
+
+ return crc32c_1byte(data, init_val);
+}
+
+/**
+ * Use single crc32 instruction to perform a hash on a 2 bytes value.
+ * Fall back to software crc32 implementation in case SSE4.2 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_2byte(uint16_t data, uint32_t init_val)
+{
+#if defined RTE_ARCH_X86
+ if (likely(crc32_alg & CRC32_SSE42))
+ return crc32c_sse42_u16(data, init_val);
+#endif
+
+ return crc32c_2bytes(data, init_val);
+}
+
/**
* Use single crc32 instruction to perform a hash on a 4 byte value.
* Fall back to software crc32 implementation in case SSE4.2 is
static inline uint32_t
rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
{
-#if defined RTE_ARCH_I686 || defined RTE_ARCH_X86_64
+#if defined RTE_ARCH_X86
if (likely(crc32_alg & CRC32_SSE42))
return crc32c_sse42_u32(data, init_val);
#endif
return crc32c_sse42_u64(data, init_val);
#endif
-#if defined RTE_ARCH_I686 || defined RTE_ARCH_X86_64
+#if defined RTE_ARCH_X86
if (likely(crc32_alg & CRC32_SSE42))
return crc32c_sse42_u64_mimic(data, init_val);
#endif
return crc32c_2words(data, init_val);
}
+#endif
+
/**
* Calculate CRC32 hash on user-supplied byte array.
*
rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
{
unsigned i;
- uint64_t temp = 0;
uintptr_t pd = (uintptr_t) data;
for (i = 0; i < data_len / 8; i++) {
pd += 8;
}
- switch (7 - (data_len & 0x07)) {
- case 0:
- temp |= (uint64_t) *((const uint8_t *)pd + 6) << 48;
- /* Fallthrough */
- case 1:
- temp |= (uint64_t) *((const uint8_t *)pd + 5) << 40;
- /* Fallthrough */
- case 2:
- temp |= (uint64_t) *((const uint8_t *)pd + 4) << 32;
- temp |= *(const uint32_t *)pd;
- init_val = rte_hash_crc_8byte(temp, init_val);
- break;
- case 3:
+ if (data_len & 0x4) {
init_val = rte_hash_crc_4byte(*(const uint32_t *)pd, init_val);
- break;
- case 4:
- temp |= *((const uint8_t *)pd + 2) << 16;
- /* Fallthrough */
- case 5:
- temp |= *((const uint8_t *)pd + 1) << 8;
- /* Fallthrough */
- case 6:
- temp |= *(const uint8_t *)pd;
- init_val = rte_hash_crc_4byte(temp, init_val);
- /* Fallthrough */
- default:
- break;
+ pd += 4;
}
+ if (data_len & 0x2) {
+ init_val = rte_hash_crc_2byte(*(const uint16_t *)pd, init_val);
+ pd += 2;
+ }
+
+ if (data_len & 0x1)
+ init_val = rte_hash_crc_1byte(*(const uint8_t *)pd, init_val);
+
return init_val;
}
git.droids-corp.org / dpdk.git / blobdiff