DPDK  18.05.1
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_ */
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