lib/librte_lpm/rte_lpm_neon.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2015 Cavium, Inc.
   3  * Copyright(c) 2010-2014 Intel Corporation.
   4  */
   5
   6 #ifndef _RTE_LPM_NEON_H_
   7 #define _RTE_LPM_NEON_H_
   8
   9 #include <rte_branch_prediction.h>
  10 #include <rte_byteorder.h>
  11 #include <rte_common.h>
  12 #include <rte_vect.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         uint32x4_t 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 uint32_t mask = UINT8_MAX;
  29         const int32x4_t mask8 = vdupq_n_s32(mask);
  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 = vshrq_n_u32((uint32x4_t)ip, CHAR_BIT);
  49
  50         /* extract values from tbl24[] */
  51         idx = vgetq_lane_u64((uint64x2_t)i24, 0);
  52
  53         ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
  54         tbl[0] = *ptbl;
  55         ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
  56         tbl[1] = *ptbl;
  57
  58         idx = vgetq_lane_u64((uint64x2_t)i24, 1);
  59
  60         ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
  61         tbl[2] = *ptbl;
  62         ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
  63         tbl[3] = *ptbl;
  64
  65         /* get 4 indexes for tbl8[]. */
  66         i8.x = vandq_s32(ip, mask8);
  67
  68         pt = (uint64_t)tbl[0] |
  69                 (uint64_t)tbl[1] << 32;
  70         pt2 = (uint64_t)tbl[2] |
  71                 (uint64_t)tbl[3] << 32;
  72
  73         /* search successfully finished for all 4 IP addresses. */
  74         if (likely((pt & mask_xv) == mask_v) &&
  75                         likely((pt2 & mask_xv) == mask_v)) {
  76                 *(uint64_t *)hop = pt & RTE_LPM_MASKX4_RES;
  77                 *(uint64_t *)(hop + 2) = pt2 & RTE_LPM_MASKX4_RES;
  78                 return;
  79         }
  80
  81         if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
  82                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
  83                 i8.u32[0] = i8.u32[0] +
  84                         (uint8_t)tbl[0] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
  85                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
  86                 tbl[0] = *ptbl;
  87         }
  88         if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
  89                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
  90                 i8.u32[1] = i8.u32[1] +
  91                         (uint8_t)tbl[1] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
  92                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
  93                 tbl[1] = *ptbl;
  94         }
  95         if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
  96                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
  97                 i8.u32[2] = i8.u32[2] +
  98                         (uint8_t)tbl[2] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
  99                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
 100                 tbl[2] = *ptbl;
 101         }
 102         if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
 103                         RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
 104                 i8.u32[3] = i8.u32[3] +
 105                         (uint8_t)tbl[3] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
 106                 ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
 107                 tbl[3] = *ptbl;
 108         }
 109
 110         hop[0] = (tbl[0] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[0] & 0x00FFFFFF : defv;
 111         hop[1] = (tbl[1] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[1] & 0x00FFFFFF : defv;
 112         hop[2] = (tbl[2] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[2] & 0x00FFFFFF : defv;
 113         hop[3] = (tbl[3] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[3] & 0x00FFFFFF : defv;
 114 }
 115
 116 #ifdef __cplusplus
 117 }
 118 #endif
 119
 120 #endif /* _RTE_LPM_NEON_H_ */