DPDK  20.05.0
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 
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_ */
#define likely(x)
#define unlikely(x)
static void rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4], uint32_t defv)
#define RTE_LPM_LOOKUP_SUCCESS
Definition: rte_lpm.h:63