lib/librte_lpm/rte_lpm_sse.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   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_LPM_SSE_H_
  35 #define _RTE_LPM_SSE_H_
  36
  37 #include <rte_branch_prediction.h>
  38 #include <rte_byteorder.h>
  39 #include <rte_common.h>
  40 #include <rte_vect.h>
  41 #include <rte_lpm.h>
  42
  43 #ifdef __cplusplus
  44 extern "C" {
  45 #endif
  46
  47 static inline void
  48 rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
  49         uint32_t defv)
  50 {
  51         __m128i i24;
  52         rte_xmm_t i8;
  53         uint32_t tbl[4];
  54         uint64_t idx, pt, pt2;
  55         const uint32_t *ptbl;
  56
  57         const __m128i mask8 =
  58                 _mm_set_epi32(UINT8_MAX, UINT8_MAX, UINT8_MAX, UINT8_MAX);
  59
  60         /*
  61          * RTE_LPM_VALID_EXT_ENTRY_BITMASK for 2 LPM entries
  62          * as one 64-bit value (0x0300000003000000).
  63          */
  64         const uint64_t mask_xv =
  65                 ((uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK |
  66                 (uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK << 32);
  67
  68         /*
  69          * RTE_LPM_LOOKUP_SUCCESS for 2 LPM entries
  70          * as one 64-bit value (0x0100000001000000).
  71          */
  72         const uint64_t mask_v =
  73                 ((uint64_t)RTE_LPM_LOOKUP_SUCCESS |
  74                 (uint64_t)RTE_LPM_LOOKUP_SUCCESS << 32);
  75
  76         /* get 4 indexes for tbl24[]. */
  77         i24 = _mm_srli_epi32(ip, CHAR_BIT);
  78
  79         /* extract values from tbl24[] */
  80         idx = _mm_cvtsi128_si64(i24);
  81         i24 = _mm_srli_si128(i24, sizeof(uint64_t));
  82
  83         ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
  84         tbl[0] = *ptbl;
  85         ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
  86         tbl[1] = *ptbl;
  87
  88         idx = _mm_cvtsi128_si64(i24);
  89
  90         ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
  91         tbl[2] = *ptbl;
  92         ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
  93         tbl[3] = *ptbl;
  94
  95         /* get 4 indexes for tbl8[]. */
  96         i8.x = _mm_and_si128(ip, mask8);
  97
  98         pt = (uint64_t)tbl[0] |
  99                 (uint64_t)tbl[1] << 32;
 100         pt2 = (uint64_t)tbl[2] |
 101                 (uint64_t)tbl[3] << 32;
 102
 103         /* search successfully finished for all 4 IP addresses. */
 104         if (likely((pt & mask_xv) == mask_v) &&
 105                         likely((pt2 & mask_xv) == mask_v)) {
 106                 *(uint64_t *)hop = pt & RTE_LPM_MASKX4_RES;
 107                 *(uint64_t *)(hop + 2) = pt2 & RTE_LPM_MASKX4_RES;
 108                 return;
 109         }
 110
 111         if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
 112                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
 113                 i8.u32[0] = i8.u32[0] +
 114                         (uint8_t)tbl[0] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 115                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
 116                 tbl[0] = *ptbl;
 117         }
 118         if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
 119                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
 120                 i8.u32[1] = i8.u32[1] +
 121                         (uint8_t)tbl[1] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 122                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
 123                 tbl[1] = *ptbl;
 124         }
 125         if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
 126                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
 127                 i8.u32[2] = i8.u32[2] +
 128                         (uint8_t)tbl[2] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 129                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
 130                 tbl[2] = *ptbl;
 131         }
 132         if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
 133                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
 134                 i8.u32[3] = i8.u32[3] +
 135                         (uint8_t)tbl[3] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 136                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
 137                 tbl[3] = *ptbl;
 138         }
 139
 140         hop[0] = (tbl[0] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[0] & 0x00FFFFFF : defv;
 141         hop[1] = (tbl[1] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[1] & 0x00FFFFFF : defv;
 142         hop[2] = (tbl[2] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[2] & 0x00FFFFFF : defv;
 143         hop[3] = (tbl[3] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[3] & 0x00FFFFFF : defv;
 144 }
 145
 146 #ifdef __cplusplus
 147 }
 148 #endif
 149
 150 #endif /* _RTE_LPM_SSE_H_ */