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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2017-2018 Linaro Limited
*/
/**
* @file
*
* ODP Toeplitz hash function
*/
#ifndef ODPH_THASH_H_
#define ODPH_THASH_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <odp/api/align.h>
#include <odp/api/byteorder.h>
#include <odp/api/debug.h>
#include <protocols/ip.h>
#include <stdint.h>
/** rss data type */
typedef union {
uint8_t u8[40];
uint32_t u32[10];
} rss_key;
/** 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;
/** IPv6 tuple */
typedef struct thash_ipv6_tuple {
_odp_ipv6_addr_t src_addr;
_odp_ipv6_addr_t dst_addr;
union {
struct {
uint16_t sport;
uint16_t dport;
};
uint32_t sctp_tag;
};
} thash_ipv6_tuple_t;
/** Thash tuple union */
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++) {
*(tuple->v6.src_addr.u32 + i) =
odp_be_to_cpu_32(*(ipv6->src_addr.u32 + i));
*(tuple->v6.dst_addr.u32 + i) =
odp_be_to_cpu_32(*(ipv6->dst_addr.u32 + i));
}
}
static inline
uint32_t thash_softrss(uint32_t *tuple, uint8_t len,
const rss_key key)
{
uint32_t i, j, 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.u32)[j]) << i | (uint32_t)((uint64_t)
(odp_cpu_to_be_32(((const uint32_t *)key.u32)
[j + 1])) >> (32 - i));
}
}
}
return ret;
}
/**
* @}
*/
#ifdef __cplusplus
}
#endif
#endif
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