ceph/src/dpdk/lib/librte_hash/rte_thash.h

   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
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  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
  18  *       contributors may be used to endorse or promote products derived
  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
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef _RTE_THASH_H
  35 #define _RTE_THASH_H
  36
  37 /**
  38  * @file
  39  *
  40  * toeplitz hash functions.
  41  */
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 /**
  48  * Software implementation of the Toeplitz hash function used by RSS.
  49  * Can be used either for packet distribution on single queue NIC
  50  * or for simulating of RSS computation on specific NIC (for example
  51  * after GRE header decapsulating)
  52  */
  53
  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
  71 /**
  72  * length in dwords of input tuple to
  73  * calculate hash of ipv4 header only
  74  */
  75 #define RTE_THASH_V4_L3_LEN     ((sizeof(struct rte_ipv4_tuple) -       \
  76                         sizeof(((struct rte_ipv4_tuple *)0)->sctp_tag)) / 4)
  77
  78 /**
  79  * length in dwords of input tuple to
  80  * calculate hash of ipv4 header +
  81  * transport header
  82  */
  83 #define RTE_THASH_V4_L4_LEN      ((sizeof(struct rte_ipv4_tuple)) / 4)
  84
  85 /**
  86  * length in dwords of input tuple to
  87  * calculate hash of ipv6 header only
  88  */
  89 #define RTE_THASH_V6_L3_LEN     ((sizeof(struct rte_ipv6_tuple) -       \
  90                         sizeof(((struct rte_ipv6_tuple *)0)->sctp_tag)) / 4)
  91
  92 /**
  93  * length in dwords of input tuple to
  94  * calculate hash of ipv6 header +
  95  * transport header
  96  */
  97 #define RTE_THASH_V6_L4_LEN     ((sizeof(struct rte_ipv6_tuple)) / 4)
  98
  99 /**
 100  * IPv4 tuple
 101  * addresses and ports/sctp_tag have to be CPU byte order
 102  */
 103 struct rte_ipv4_tuple {
 104         uint32_t        src_addr;
 105         uint32_t        dst_addr;
 106         RTE_STD_C11
 107         union {
 108                 struct {
 109                         uint16_t dport;
 110                         uint16_t sport;
 111                 };
 112                 uint32_t        sctp_tag;
 113         };
 114 };
 115
 116 /**
 117  * IPv6 tuple
 118  * Addresses have to be filled by rte_thash_load_v6_addr()
 119  * ports/sctp_tag have to be CPU byte order
 120  */
 121 struct rte_ipv6_tuple {
 122         uint8_t         src_addr[16];
 123         uint8_t         dst_addr[16];
 124         RTE_STD_C11
 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
 143 /**
 144  * Prepare special converted key to use with rte_softrss_be()
 145  * @param orig
 146  *   pointer to original RSS key
 147  * @param targ
 148  *   pointer to target RSS key
 149  * @param len
 150  *   RSS key length
 151  */
 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
 161 /**
 162  * Prepare and load IPv6 addresses (src and dst)
 163  * into target tuple
 164  * @param orig
 165  *   Pointer to ipv6 header of the original packet
 166  * @param targ
 167  *   Pointer to rte_ipv6_tuple structure
 168  */
 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
 190 /**
 191  * Generic implementation. Can be used with original rss_key
 192  * @param input_tuple
 193  *   Pointer to input tuple
 194  * @param input_len
 195  *   Length of input_tuple in 4-bytes chunks
 196  * @param rss_key
 197  *   Pointer to RSS hash key.
 198  * @return
 199  *   Calculated hash value.
 200  */
 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
 219 /**
 220  * Optimized implementation.
 221  * If you want the calculated hash value matches NIC RSS value
 222  * you have to use special converted key with rte_convert_rss_key() fn.
 223  * @param input_tuple
 224  *   Pointer to input tuple
 225  * @param input_len
 226  *   Length of input_tuple in 4-bytes chunks
 227  * @param *rss_key
 228  *   Pointer to RSS hash key.
 229  * @return
 230  *   Calculated hash value.
 231  */
 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 */