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