DPDK  19.02.0
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 
13 #ifdef __cplusplus
14 extern "C" {
15 #endif
16 
17 static inline void
18 rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
19  uint32_t defv)
20 {
21  __m128i i24;
22  rte_xmm_t i8;
23  uint32_t tbl[4];
24  uint64_t idx, pt, pt2;
25  const uint32_t *ptbl;
26 
27  const __m128i mask8 =
28  _mm_set_epi32(UINT8_MAX, UINT8_MAX, UINT8_MAX, UINT8_MAX);
29 
30  /*
31  * RTE_LPM_VALID_EXT_ENTRY_BITMASK for 2 LPM entries
32  * as one 64-bit value (0x0300000003000000).
33  */
34  const uint64_t mask_xv =
35  ((uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK |
36  (uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK << 32);
37 
38  /*
39  * RTE_LPM_LOOKUP_SUCCESS for 2 LPM entries
40  * as one 64-bit value (0x0100000001000000).
41  */
42  const uint64_t mask_v =
43  ((uint64_t)RTE_LPM_LOOKUP_SUCCESS |
44  (uint64_t)RTE_LPM_LOOKUP_SUCCESS << 32);
45 
46  /* get 4 indexes for tbl24[]. */
47  i24 = _mm_srli_epi32(ip, CHAR_BIT);
48 
49  /* extract values from tbl24[] */
50  idx = _mm_cvtsi128_si64(i24);
51  /* With -O0 option, gcc 4.8 - 5.4 fails to fold sizeof() into a constant */
52  i24 = _mm_srli_si128(i24, /* sizeof(uint64_t) */ 8);
53 
54  ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
55  tbl[0] = *ptbl;
56  ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
57  tbl[1] = *ptbl;
58 
59  idx = _mm_cvtsi128_si64(i24);
60 
61  ptbl = (const uint32_t *)&lpm->tbl24[(uint32_t)idx];
62  tbl[2] = *ptbl;
63  ptbl = (const uint32_t *)&lpm->tbl24[idx >> 32];
64  tbl[3] = *ptbl;
65 
66  /* get 4 indexes for tbl8[]. */
67  i8.x = _mm_and_si128(ip, mask8);
68 
69  pt = (uint64_t)tbl[0] |
70  (uint64_t)tbl[1] << 32;
71  pt2 = (uint64_t)tbl[2] |
72  (uint64_t)tbl[3] << 32;
73 
74  /* search successfully finished for all 4 IP addresses. */
75  if (likely((pt & mask_xv) == mask_v) &&
76  likely((pt2 & mask_xv) == mask_v)) {
77  *(uint64_t *)hop = pt & RTE_LPM_MASKX4_RES;
78  *(uint64_t *)(hop + 2) = pt2 & RTE_LPM_MASKX4_RES;
79  return;
80  }
81 
82  if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
83  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
84  i8.u32[0] = i8.u32[0] +
85  (uint8_t)tbl[0] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
86  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
87  tbl[0] = *ptbl;
88  }
89  if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
90  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
91  i8.u32[1] = i8.u32[1] +
92  (uint8_t)tbl[1] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
93  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
94  tbl[1] = *ptbl;
95  }
96  if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
97  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
98  i8.u32[2] = i8.u32[2] +
99  (uint8_t)tbl[2] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
100  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
101  tbl[2] = *ptbl;
102  }
103  if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
104  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
105  i8.u32[3] = i8.u32[3] +
106  (uint8_t)tbl[3] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
107  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
108  tbl[3] = *ptbl;
109  }
110 
111  hop[0] = (tbl[0] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[0] & 0x00FFFFFF : defv;
112  hop[1] = (tbl[1] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[1] & 0x00FFFFFF : defv;
113  hop[2] = (tbl[2] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[2] & 0x00FFFFFF : defv;
114  hop[3] = (tbl[3] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[3] & 0x00FFFFFF : defv;
115 }
116 
117 #ifdef __cplusplus
118 }
119 #endif
120 
121 #endif /* _RTE_LPM_SSE_H_ */
Generated by   doxygen 1.8.1.2