lib/librte_lpm/rte_lpm_sse.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_LPM_SSE_H_
   6 #define _RTE_LPM_SSE_H_
   7
   8 #include <rte_branch_prediction.h>
   9 #include <rte_byteorder.h>
  10 #include <rte_common.h>
  11 #include <rte_vect.h>
  12 #include <rte_lpm.h>
  13
  14 #ifdef __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 static inline void
  19 rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
  20         uint32_t defv)
  21 {
  22         __m128i i24;
  23         rte_xmm_t i8;
  24         uint32_t tbl[4];
  25         uint64_t idx, pt, pt2;
  26         const uint32_t *ptbl;
  27
  28         const __m128i mask8 =
  29                 _mm_set_epi32(UINT8_MAX, UINT8_MAX, UINT8_MAX, UINT8_MAX);
  30
  31         /*
  32          * RTE_LPM_VALID_EXT_ENTRY_BITMASK for 2 LPM entries
  33          * as one 64-bit value (0x0300000003000000).
  34          */
  35         const uint64_t mask_xv =
  36                 ((uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK |
  37                 (uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK << 32);
  38
  39         /*
  40          * RTE_LPM_LOOKUP_SUCCESS for 2 LPM entries
  41          * as one 64-bit value (0x0100000001000000).
  42          */
  43         const uint64_t mask_v =
  44                 ((uint64_t)RTE_LPM_LOOKUP_SUCCESS |
  45                 (uint64_t)RTE_LPM_LOOKUP_SUCCESS << 32);
  46
  47         /* get 4 indexes for tbl24[]. */
  48         i24 = _mm_srli_epi32(ip, CHAR_BIT);
  49
  50         /* extract values from tbl24[] */
  51         idx = _mm_cvtsi128_si64(i24);
  52         /* With -O0 option, gcc 4.8 - 5.4 fails to fold sizeof() into a constant */
  53         i24 = _mm_srli_si128(i24, /* sizeof(uint64_t) */ 8);
  54
  55         ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
  56         tbl[0] = *ptbl;
  57         ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
  58         tbl[1] = *ptbl;
  59
  60         idx = _mm_cvtsi128_si64(i24);
  61
  62         ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
  63         tbl[2] = *ptbl;
  64         ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
  65         tbl[3] = *ptbl;
  66
  67         /* get 4 indexes for tbl8[]. */
  68         i8.x = _mm_and_si128(ip, mask8);
  69
  70         pt = (uint64_t)tbl[0] |
  71                 (uint64_t)tbl[1] << 32;
  72         pt2 = (uint64_t)tbl[2] |
  73                 (uint64_t)tbl[3] << 32;
  74
  75         /* search successfully finished for all 4 IP addresses. */
  76         if (likely((pt & mask_xv) == mask_v) &&
  77                         likely((pt2 & mask_xv) == mask_v)) {
  78                 *(uint64_t *)hop = pt & RTE_LPM_MASKX4_RES;
  79                 *(uint64_t *)(hop + 2) = pt2 & RTE_LPM_MASKX4_RES;
  80                 return;
  81         }
  82
  83         if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
  84                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
  85                 i8.u32[0] = i8.u32[0] +
  86                         (uint8_t)tbl[0] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
  87                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
  88                 tbl[0] = *ptbl;
  89         }
  90         if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
  91                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
  92                 i8.u32[1] = i8.u32[1] +
  93                         (uint8_t)tbl[1] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
  94                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
  95                 tbl[1] = *ptbl;
  96         }
  97         if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
  98                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
  99                 i8.u32[2] = i8.u32[2] +
 100                         (uint8_t)tbl[2] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 101                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
 102                 tbl[2] = *ptbl;
 103         }
 104         if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
 105                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
 106                 i8.u32[3] = i8.u32[3] +
 107                         (uint8_t)tbl[3] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 108                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
 109                 tbl[3] = *ptbl;
 110         }
 111
 112         hop[0] = (tbl[0] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[0] & 0x00FFFFFF : defv;
 113         hop[1] = (tbl[1] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[1] & 0x00FFFFFF : defv;
 114         hop[2] = (tbl[2] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[2] & 0x00FFFFFF : defv;
 115         hop[3] = (tbl[3] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[3] & 0x00FFFFFF : defv;
 116 }
 117
 118 #ifdef __cplusplus
 119 }
 120 #endif
 121
 122 #endif /* _RTE_LPM_SSE_H_ */