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/*-
* BSD LICENSE
*
* Copyright(c) 2015 Vladimir Medvedkin <medvedkinv@gmail.com>
* 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_THASH_H
#define _RTE_THASH_H
/**
* @file
*
* toeplitz hash functions.
*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* Software implementation of the Toeplitz hash function used by RSS.
* Can be used either for packet distribution on single queue NIC
* or for simulating of RSS computation on specific NIC (for example
* after GRE header decapsulating)
*/
#include <stdint.h>
#include <rte_byteorder.h>
#include <rte_ip.h>
#ifdef __SSE3__
#include <rte_vect.h>
#endif
#ifdef __SSE3__
/* Byte swap mask used for converting IPv6 address
* 4-byte chunks to CPU byte order
*/
static const __m128i rte_thash_ipv6_bswap_mask = {
0x0405060700010203ULL, 0x0C0D0E0F08090A0BULL};
#endif
/**
* length in dwords of input tuple to
* calculate hash of ipv4 header only
*/
#define RTE_THASH_V4_L3_LEN ((sizeof(struct rte_ipv4_tuple) - \
sizeof(((struct rte_ipv4_tuple *)0)->sctp_tag)) / 4)
/**
* length in dwords of input tuple to
* calculate hash of ipv4 header +
* transport header
*/
#define RTE_THASH_V4_L4_LEN ((sizeof(struct rte_ipv4_tuple)) / 4)
/**
* length in dwords of input tuple to
* calculate hash of ipv6 header only
*/
#define RTE_THASH_V6_L3_LEN ((sizeof(struct rte_ipv6_tuple) - \
sizeof(((struct rte_ipv6_tuple *)0)->sctp_tag)) / 4)
/**
* length in dwords of input tuple to
* calculate hash of ipv6 header +
* transport header
*/
#define RTE_THASH_V6_L4_LEN ((sizeof(struct rte_ipv6_tuple)) / 4)
/**
* IPv4 tuple
* addresses and ports/sctp_tag have to be CPU byte order
*/
struct rte_ipv4_tuple {
uint32_t src_addr;
uint32_t dst_addr;
union {
struct {
uint16_t dport;
uint16_t sport;
};
uint32_t sctp_tag;
};
};
/**
* IPv6 tuple
* Addresses have to be filled by rte_thash_load_v6_addr()
* ports/sctp_tag have to be CPU byte order
*/
struct rte_ipv6_tuple {
uint8_t src_addr[16];
uint8_t dst_addr[16];
union {
struct {
uint16_t dport;
uint16_t sport;
};
uint32_t sctp_tag;
};
};
union rte_thash_tuple {
struct rte_ipv4_tuple v4;
struct rte_ipv6_tuple v6;
#ifdef __SSE3__
} __attribute__((aligned(XMM_SIZE)));
#else
};
#endif
/**
* Prepare special converted key to use with rte_softrss_be()
* @param orig
* pointer to original RSS key
* @param targ
* pointer to target RSS key
* @param len
* RSS key length
*/
static inline void
rte_convert_rss_key(const uint32_t *orig, uint32_t *targ, int len)
{
int i;
for (i = 0; i < (len >> 2); i++)
targ[i] = rte_be_to_cpu_32(orig[i]);
}
/**
* Prepare and load IPv6 addresses (src and dst)
* into target tuple
* @param orig
* Pointer to ipv6 header of the original packet
* @param targ
* Pointer to rte_ipv6_tuple structure
*/
static inline void
rte_thash_load_v6_addrs(const struct ipv6_hdr *orig, union rte_thash_tuple *targ)
{
#ifdef __SSE3__
__m128i ipv6 = _mm_loadu_si128((const __m128i *)orig->src_addr);
*(__m128i *)targ->v6.src_addr =
_mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
ipv6 = _mm_loadu_si128((const __m128i *)orig->dst_addr);
*(__m128i *)targ->v6.dst_addr =
_mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
#else
int i;
for (i = 0; i < 4; i++) {
*((uint32_t *)targ->v6.src_addr + i) =
rte_be_to_cpu_32(*((const uint32_t *)orig->src_addr + i));
*((uint32_t *)targ->v6.dst_addr + i) =
rte_be_to_cpu_32(*((const uint32_t *)orig->dst_addr + i));
}
#endif
}
/**
* Generic implementation. Can be used with original rss_key
* @param input_tuple
* Pointer to input tuple
* @param input_len
* Length of input_tuple in 4-bytes chunks
* @param rss_key
* Pointer to RSS hash key.
* @return
* Calculated hash value.
*/
static inline uint32_t
rte_softrss(uint32_t *input_tuple, uint32_t input_len,
const uint8_t *rss_key)
{
uint32_t i, j, ret = 0;
for (j = 0; j < input_len; j++) {
for (i = 0; i < 32; i++) {
if (input_tuple[j] & (1 << (31 - i))) {
ret ^= rte_cpu_to_be_32(((const uint32_t *)rss_key)[j]) << i |
(uint32_t)((uint64_t)(rte_cpu_to_be_32(((const uint32_t *)rss_key)[j + 1])) >>
(32 - i));
}
}
}
return ret;
}
/**
* Optimized implementation.
* If you want the calculated hash value matches NIC RSS value
* you have to use special converted key with rte_convert_rss_key() fn.
* @param input_tuple
* Pointer to input tuple
* @param input_len
* Length of input_tuple in 4-bytes chunks
* @param *rss_key
* Pointer to RSS hash key.
* @return
* Calculated hash value.
*/
static inline uint32_t
rte_softrss_be(uint32_t *input_tuple, uint32_t input_len,
const uint8_t *rss_key)
{
uint32_t i, j, ret = 0;
for (j = 0; j < input_len; j++) {
for (i = 0; i < 32; i++) {
if (input_tuple[j] & (1 << (31 - i))) {
ret ^= ((const uint32_t *)rss_key)[j] << i |
(uint32_t)((uint64_t)(((const uint32_t *)rss_key)[j + 1]) >> (32 - i));
}
}
}
return ret;
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_THASH_H */
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