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[API-NEXTv5,2/3] linux-generic: add toeplitz hash algorithm

Message ID 1501160903-25098-2-git-send-email-bala.manoharan@linaro.org
State New
Headers show
Series [API-NEXTv5,1/3] api: classification: add support for packet hashing in classification | expand

Commit Message

Balasubramanian Manoharan July 27, 2017, 1:08 p.m. UTC 
Adds toeplitz hash algorithm implementation for RSS hashing

Signed-off-by: Balasubramanian Manoharan <bala.manoharan@linaro.org>

---
 platform/linux-generic/include/protocols/thash.h | 108 +++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 platform/linux-generic/include/protocols/thash.h

-- 
1.9.1
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Patch

diff --git a/platform/linux-generic/include/protocols/thash.h b/platform/linux-generic/include/protocols/thash.h
new file mode 100644
index 0000000..fe141e3
--- /dev/null
+++ b/platform/linux-generic/include/protocols/thash.h
@@ -0,0 +1,108 @@ 
+/* Copyright (c) 2017, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+/**
+ * @file
+ *
+ * ODP Toeplitz hash function
+ */
+
+#ifndef ODPH_THASH_H_
+#define ODPH_THASH_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <protocols/ip.h>
+
+/** IPv4 tuple
+ *
+ */
+typedef struct thash_ipv4_tuple {
+	uint32_t src_addr;
+	uint32_t dst_addr;
+	union {
+		struct {
+			uint16_t sport;
+			uint16_t dport;
+		};
+		uint32_t sctp_tag;
+	};
+} thash_ipv4_tuple_t;
+
+typedef struct thash_ipv6_tuple {
+	uint8_t src_addr[16];
+	uint8_t dst_addr[16];
+	union {
+		struct {
+			uint16_t sport;
+			uint16_t dport;
+		};
+		uint32_t sctp_tag;
+	};
+} thash_ipv6_tuple_t;
+
+#define ODP_THASH_V4_L4_LEN (sizeof(thash_ipv4_tuple_t) / 4)
+
+#define ODP_THASH_V4_L3_LEN ((sizeof(thash_ipv4_tuple_t) - \
+			sizeof(((thash_ipv4_tuple_t *)0)->sctp_tag)) / 4)
+
+#define ODP_THASH_V6_L4_LEN (sizeof(thash_ipv6_tuple_t) / 4)
+
+#define ODP_THASH_V6_L3_LEN ((sizeof(thash_ipv6_tuple_t) - \
+			sizeof(((thash_ipv6_tuple_t *)0)->sctp_tag)) / 4)
+
+typedef union {
+	thash_ipv4_tuple_t v4;
+	thash_ipv6_tuple_t v6;
+} thash_tuple_t;
+
+static inline
+void thash_load_ipv6_addr(const _odp_ipv6hdr_t *ipv6,
+			  thash_tuple_t *tuple)
+{
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		*((uint32_t *)tuple->v6.src_addr + i) =
+		odp_be_to_cpu_32(*((const uint32_t *)ipv6->src_addr.u32 + i));
+
+		*((uint32_t *)tuple->v6.dst_addr + i) =
+		odp_be_to_cpu_32(*((const uint32_t *)ipv6->dst_addr.u32 + i));
+	}
+}
+
+static inline
+uint32_t thash_softrss(uint32_t *tuple, uint8_t len,
+		       const uint8_t *key)
+{
+	uint32_t i, j, ret;
+
+	ret = 0;
+	for (j = 0; j < len; j++) {
+		for (i = 0; i < 32; i++) {
+			if (tuple[j] & (1 << (31 - i))) {
+				ret ^= odp_cpu_to_be_32(((const uint32_t *)
+				key)[j]) << i | (uint32_t)((uint64_t)
+				(odp_cpu_to_be_32(((const uint32_t *)key)
+				[j + 1])) >> (32 - i));
+			}
+		}
+	}
+
+	return ret;
+}
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif