DPDK  17.05.2
rte_lpm_altivec.h
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32 
33 #ifndef _RTE_LPM_ALTIVEC_H_
34 #define _RTE_LPM_ALTIVEC_H_
35 
36 #include <rte_branch_prediction.h>
37 #include <rte_byteorder.h>
38 #include <rte_common.h>
39 #include <rte_vect.h>
40 
41 #ifdef __cplusplus
42 extern "C" {
43 #endif
44 
45 static inline void
46 rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
47  uint32_t defv)
48 {
49  vector signed int i24;
50  rte_xmm_t i8;
51  uint32_t tbl[4];
52  uint64_t idx, pt, pt2;
53  const uint32_t *ptbl;
54 
55  const uint32_t mask = UINT8_MAX;
56  const vector signed int mask8 = (xmm_t){mask, mask, mask, mask};
57 
58  /*
59  * RTE_LPM_VALID_EXT_ENTRY_BITMASK for 2 LPM entries
60  * as one 64-bit value (0x0300000003000000).
61  */
62  const uint64_t mask_xv =
63  ((uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK |
64  (uint64_t)RTE_LPM_VALID_EXT_ENTRY_BITMASK << 32);
65 
66  /*
67  * RTE_LPM_LOOKUP_SUCCESS for 2 LPM entries
68  * as one 64-bit value (0x0100000001000000).
69  */
70  const uint64_t mask_v =
71  ((uint64_t)RTE_LPM_LOOKUP_SUCCESS |
72  (uint64_t)RTE_LPM_LOOKUP_SUCCESS << 32);
73 
74  /* get 4 indexes for tbl24[]. */
75  i24 = vec_sr((xmm_t) ip,
76  (vector unsigned int){CHAR_BIT, CHAR_BIT, CHAR_BIT, CHAR_BIT});
77 
78  /* extract values from tbl24[] */
79  idx = (uint32_t)i24[0];
80  idx = idx < (1<<24) ? idx : (1<<24)-1;
81  ptbl = (const uint32_t *)&lpm->tbl24[idx];
82  tbl[0] = *ptbl;
83 
84  idx = (uint32_t) i24[1];
85  idx = idx < (1<<24) ? idx : (1<<24)-1;
86  ptbl = (const uint32_t *)&lpm->tbl24[idx];
87  tbl[1] = *ptbl;
88 
89  idx = (uint32_t) i24[2];
90  idx = idx < (1<<24) ? idx : (1<<24)-1;
91  ptbl = (const uint32_t *)&lpm->tbl24[idx];
92  tbl[2] = *ptbl;
93 
94  idx = (uint32_t) i24[3];
95  idx = idx < (1<<24) ? idx : (1<<24)-1;
96  ptbl = (const uint32_t *)&lpm->tbl24[idx];
97  tbl[3] = *ptbl;
98 
99  /* get 4 indexes for tbl8[]. */
100  i8.x = vec_and(ip, mask8);
101 
102  pt = (uint64_t)tbl[0] |
103  (uint64_t)tbl[1] << 32;
104  pt2 = (uint64_t)tbl[2] |
105  (uint64_t)tbl[3] << 32;
106 
107  /* search successfully finished for all 4 IP addresses. */
108  if (likely((pt & mask_xv) == mask_v) &&
109  likely((pt2 & mask_xv) == mask_v)) {
110  *(uint64_t *)hop = pt & RTE_LPM_MASKX4_RES;
111  *(uint64_t *)(hop + 2) = pt2 & RTE_LPM_MASKX4_RES;
112  return;
113  }
114 
115  if (unlikely((pt & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
116  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
117  i8.u32[0] = i8.u32[0] +
118  (uint8_t)tbl[0] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
119  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[0]];
120  tbl[0] = *ptbl;
121  }
122  if (unlikely((pt >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
123  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
124  i8.u32[1] = i8.u32[1] +
125  (uint8_t)tbl[1] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
126  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[1]];
127  tbl[1] = *ptbl;
128  }
129  if (unlikely((pt2 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
130  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
131  i8.u32[2] = i8.u32[2] +
132  (uint8_t)tbl[2] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
133  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[2]];
134  tbl[2] = *ptbl;
135  }
136  if (unlikely((pt2 >> 32 & RTE_LPM_VALID_EXT_ENTRY_BITMASK) ==
137  RTE_LPM_VALID_EXT_ENTRY_BITMASK)) {
138  i8.u32[3] = i8.u32[3] +
139  (uint8_t)tbl[3] * RTE_LPM_TBL8_GROUP_NUM_ENTRIES;
140  ptbl = (const uint32_t *)&lpm->tbl8[i8.u32[3]];
141  tbl[3] = *ptbl;
142  }
143 
144  hop[0] = (tbl[0] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[0] & 0x00FFFFFF : defv;
145  hop[1] = (tbl[1] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[1] & 0x00FFFFFF : defv;
146  hop[2] = (tbl[2] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[2] & 0x00FFFFFF : defv;
147  hop[3] = (tbl[3] & RTE_LPM_LOOKUP_SUCCESS) ? tbl[3] & 0x00FFFFFF : defv;
148 }
149 
150 #ifdef __cplusplus
151 }
152 #endif
153 
154 #endif /* _RTE_LPM_ALTIVEC_H_ */
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