DPDK  19.02.0
rte_thash.h
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1 /*-
2  * BSD LICENSE
3  *
4  * Copyright(c) 2015 Vladimir Medvedkin <medvedkinv@gmail.com>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
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10  *
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12  * notice, this list of conditions and the following disclaimer.
13  * * Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in
15  * the documentation and/or other materials provided with the
16  * distribution.
17  * * Neither the name of Intel Corporation nor the names of its
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19  * from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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25  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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32  */
33 
34 #ifndef _RTE_THASH_H
35 #define _RTE_THASH_H
36 
43 #ifdef __cplusplus
44 extern "C" {
45 #endif
46 
54 #include <stdint.h>
55 #include <rte_byteorder.h>
56 #include <rte_config.h>
57 #include <rte_ip.h>
58 #include <rte_common.h>
59 
60 #if defined(RTE_ARCH_X86) || defined(RTE_MACHINE_CPUFLAG_NEON)
61 #include <rte_vect.h>
62 #endif
63 
64 #ifdef RTE_ARCH_X86
65 /* Byte swap mask used for converting IPv6 address
66  * 4-byte chunks to CPU byte order
67  */
68 static const __m128i rte_thash_ipv6_bswap_mask = {
69  0x0405060700010203ULL, 0x0C0D0E0F08090A0BULL};
70 #endif
71 
76 #define RTE_THASH_V4_L3_LEN ((sizeof(struct rte_ipv4_tuple) - \
77  sizeof(((struct rte_ipv4_tuple *)0)->sctp_tag)) / 4)
78 
84 #define RTE_THASH_V4_L4_LEN ((sizeof(struct rte_ipv4_tuple)) / 4)
85 
90 #define RTE_THASH_V6_L3_LEN ((sizeof(struct rte_ipv6_tuple) - \
91  sizeof(((struct rte_ipv6_tuple *)0)->sctp_tag)) / 4)
92 
98 #define RTE_THASH_V6_L4_LEN ((sizeof(struct rte_ipv6_tuple)) / 4)
99 
105  uint32_t src_addr;
106  uint32_t dst_addr;
108  union {
109  struct {
110  uint16_t dport;
111  uint16_t sport;
112  };
113  uint32_t sctp_tag;
114  };
115 };
116 
123  uint8_t src_addr[16];
124  uint8_t dst_addr[16];
126  union {
127  struct {
128  uint16_t dport;
129  uint16_t sport;
130  };
131  uint32_t sctp_tag;
132  };
133 };
134 
135 union rte_thash_tuple {
136  struct rte_ipv4_tuple v4;
137  struct rte_ipv6_tuple v6;
138 #ifdef RTE_ARCH_X86
139 } __attribute__((aligned(XMM_SIZE)));
140 #else
141 };
142 #endif
143 
153 static inline void
154 rte_convert_rss_key(const uint32_t *orig, uint32_t *targ, int len)
155 {
156  int i;
157 
158  for (i = 0; i < (len >> 2); i++)
159  targ[i] = rte_be_to_cpu_32(orig[i]);
160 }
161 
170 static inline void
171 rte_thash_load_v6_addrs(const struct ipv6_hdr *orig, union rte_thash_tuple *targ)
172 {
173 #ifdef RTE_ARCH_X86
174  __m128i ipv6 = _mm_loadu_si128((const __m128i *)orig->src_addr);
175  *(__m128i *)targ->v6.src_addr =
176  _mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
177  ipv6 = _mm_loadu_si128((const __m128i *)orig->dst_addr);
178  *(__m128i *)targ->v6.dst_addr =
179  _mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
180 #elif defined(RTE_MACHINE_CPUFLAG_NEON)
181  uint8x16_t ipv6 = vld1q_u8((uint8_t const *)orig->src_addr);
182  vst1q_u8((uint8_t *)targ->v6.src_addr, vrev32q_u8(ipv6));
183  ipv6 = vld1q_u8((uint8_t const *)orig->dst_addr);
184  vst1q_u8((uint8_t *)targ->v6.dst_addr, vrev32q_u8(ipv6));
185 #else
186  int i;
187  for (i = 0; i < 4; i++) {
188  *((uint32_t *)targ->v6.src_addr + i) =
189  rte_be_to_cpu_32(*((const uint32_t *)orig->src_addr + i));
190  *((uint32_t *)targ->v6.dst_addr + i) =
191  rte_be_to_cpu_32(*((const uint32_t *)orig->dst_addr + i));
192  }
193 #endif
194 }
195 
207 static inline uint32_t
208 rte_softrss(uint32_t *input_tuple, uint32_t input_len,
209  const uint8_t *rss_key)
210 {
211  uint32_t i, j, map, ret = 0;
212 
213  for (j = 0; j < input_len; j++) {
214  for (map = input_tuple[j]; map; map &= (map - 1)) {
215  i = rte_bsf32(map);
216  ret ^= rte_cpu_to_be_32(((const uint32_t *)rss_key)[j]) << (31 - i) |
217  (uint32_t)((uint64_t)(rte_cpu_to_be_32(((const uint32_t *)rss_key)[j + 1])) >>
218  (i + 1));
219  }
220  }
221  return ret;
222 }
223 
237 static inline uint32_t
238 rte_softrss_be(uint32_t *input_tuple, uint32_t input_len,
239  const uint8_t *rss_key)
240 {
241  uint32_t i, j, map, ret = 0;
242 
243  for (j = 0; j < input_len; j++) {
244  for (map = input_tuple[j]; map; map &= (map - 1)) {
245  i = rte_bsf32(map);
246  ret ^= ((const uint32_t *)rss_key)[j] << (31 - i) |
247  (uint32_t)((uint64_t)(((const uint32_t *)rss_key)[j + 1]) >> (i + 1));
248  }
249  }
250  return ret;
251 }
252 
253 #ifdef __cplusplus
254 }
255 #endif
256 
257 #endif /* _RTE_THASH_H */