DPDK  17.05.2
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.
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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_ip.h>
57 #include <rte_common.h>
58 
59 #ifdef __SSE3__
60 #include <rte_vect.h>
61 #endif
62 
63 #ifdef __SSE3__
64 /* Byte swap mask used for converting IPv6 address
65  * 4-byte chunks to CPU byte order
66  */
67 static const __m128i rte_thash_ipv6_bswap_mask = {
68  0x0405060700010203ULL, 0x0C0D0E0F08090A0BULL};
69 #endif
70 
75 #define RTE_THASH_V4_L3_LEN ((sizeof(struct rte_ipv4_tuple) - \
76  sizeof(((struct rte_ipv4_tuple *)0)->sctp_tag)) / 4)
77 
83 #define RTE_THASH_V4_L4_LEN ((sizeof(struct rte_ipv4_tuple)) / 4)
84 
89 #define RTE_THASH_V6_L3_LEN ((sizeof(struct rte_ipv6_tuple) - \
90  sizeof(((struct rte_ipv6_tuple *)0)->sctp_tag)) / 4)
91 
97 #define RTE_THASH_V6_L4_LEN ((sizeof(struct rte_ipv6_tuple)) / 4)
98 
104  uint32_t src_addr;
105  uint32_t dst_addr;
107  union {
108  struct {
109  uint16_t dport;
110  uint16_t sport;
111  };
112  uint32_t sctp_tag;
113  };
114 };
115 
122  uint8_t src_addr[16];
123  uint8_t dst_addr[16];
125  union {
126  struct {
127  uint16_t dport;
128  uint16_t sport;
129  };
130  uint32_t sctp_tag;
131  };
132 };
133 
134 union rte_thash_tuple {
135  struct rte_ipv4_tuple v4;
136  struct rte_ipv6_tuple v6;
137 #ifdef __SSE3__
138 } __attribute__((aligned(XMM_SIZE)));
139 #else
140 };
141 #endif
142 
152 static inline void
153 rte_convert_rss_key(const uint32_t *orig, uint32_t *targ, int len)
154 {
155  int i;
156 
157  for (i = 0; i < (len >> 2); i++)
158  targ[i] = rte_be_to_cpu_32(orig[i]);
159 }
160 
169 static inline void
170 rte_thash_load_v6_addrs(const struct ipv6_hdr *orig, union rte_thash_tuple *targ)
171 {
172 #ifdef __SSE3__
173  __m128i ipv6 = _mm_loadu_si128((const __m128i *)orig->src_addr);
174  *(__m128i *)targ->v6.src_addr =
175  _mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
176  ipv6 = _mm_loadu_si128((const __m128i *)orig->dst_addr);
177  *(__m128i *)targ->v6.dst_addr =
178  _mm_shuffle_epi8(ipv6, rte_thash_ipv6_bswap_mask);
179 #else
180  int i;
181  for (i = 0; i < 4; i++) {
182  *((uint32_t *)targ->v6.src_addr + i) =
183  rte_be_to_cpu_32(*((const uint32_t *)orig->src_addr + i));
184  *((uint32_t *)targ->v6.dst_addr + i) =
185  rte_be_to_cpu_32(*((const uint32_t *)orig->dst_addr + i));
186  }
187 #endif
188 }
189 
201 static inline uint32_t
202 rte_softrss(uint32_t *input_tuple, uint32_t input_len,
203  const uint8_t *rss_key)
204 {
205  uint32_t i, j, ret = 0;
206 
207  for (j = 0; j < input_len; j++) {
208  for (i = 0; i < 32; i++) {
209  if (input_tuple[j] & (1 << (31 - i))) {
210  ret ^= rte_cpu_to_be_32(((const uint32_t *)rss_key)[j]) << i |
211  (uint32_t)((uint64_t)(rte_cpu_to_be_32(((const uint32_t *)rss_key)[j + 1])) >>
212  (32 - i));
213  }
214  }
215  }
216  return ret;
217 }
218 
232 static inline uint32_t
233 rte_softrss_be(uint32_t *input_tuple, uint32_t input_len,
234  const uint8_t *rss_key)
235 {
236  uint32_t i, j, ret = 0;
237 
238  for (j = 0; j < input_len; j++) {
239  for (i = 0; i < 32; i++) {
240  if (input_tuple[j] & (1 << (31 - i))) {
241  ret ^= ((const uint32_t *)rss_key)[j] << i |
242  (uint32_t)((uint64_t)(((const uint32_t *)rss_key)[j + 1]) >> (32 - i));
243  }
244  }
245  }
246  return ret;
247 }
248 
249 #ifdef __cplusplus
250 }
251 #endif
252 
253 #endif /* _RTE_THASH_H */