1 files changed, 110 insertions, 0 deletions
diff --git a/src/dpdk_lib18/librte_hash/rte_hash_crc.h b/src/dpdk_lib18/librte_hash/rte_hash_crc.h
new file mode 100755
index 00000000..b48b0db1
--- /dev/null
+++ b/src/dpdk_lib18/librte_hash/rte_hash_crc.h
@@ -0,0 +1,110 @@
+/*-
+ *   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 _RTE_HASH_CRC_H_
+#define _RTE_HASH_CRC_H_
+
+/**
+ * @file
+ *
+ * RTE CRC Hash
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <nmmintrin.h>
+
+/**
+ * Use single crc32 instruction to perform a hash on a 4 byte value.
+ *
+ * @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)
+{
+	return _mm_crc32_u32(init_val, data);
+}
+
+/**
+ * Use crc32 instruction to perform a hash.
+ *
+ * @param data
+ *   Data to perform hash on.
+ * @param data_len
+ *   How many bytes to use to calculate hash value.
+ * @param init_val
+ *   Value to initialise hash generator.
+ * @return
+ *   32bit calculated hash value.
+ */
+static inline uint32_t
+rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
+{
+	unsigned i;
+	uint32_t temp = 0;
+	const uint32_t *p32 = (const uint32_t *)data;
+
+	for (i = 0; i < data_len / 4; i++) {
+		init_val = rte_hash_crc_4byte(*p32++, init_val);
+	}
+
+	switch (3 - (data_len & 0x03)) {
+	case 0:
+		temp |= *((const uint8_t *)p32 + 2) << 16;
+		/* Fallthrough */
+	case 1:
+		temp |= *((const uint8_t *)p32 + 1) << 8;
+		/* Fallthrough */
+	case 2:
+		temp |= *((const uint8_t *)p32);
+		init_val = rte_hash_crc_4byte(temp, init_val);
+	default:
+		break;
+	}
+
+	return init_val;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_HASH_CRC_H_ */