DPDK  17.11.10
rte_efd_arm64.h
1 /*
2  * BSD LICENSE
3  *
4  * Copyright (C) Cavium, Inc. 2017.
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15  * distribution.
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17  * contributors may be used to endorse or promote products derived
18  * from this software without specific prior written permission.
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31  */
32 
33 /*
34  * rte_efd_arm64.h
35  * This file holds all arm64 specific EFD functions
36  */
37 
38 #ifndef __RTE_EFD_ARM64_H__
39 #define __RTE_EFD_ARM64_H__
40 
41 #include <rte_vect.h>
42 
43 static inline efd_value_t
44 efd_lookup_internal_neon(const efd_hashfunc_t *group_hash_idx,
45  const efd_lookuptbl_t *group_lookup_table,
46  const uint32_t hash_val_a, const uint32_t hash_val_b)
47 {
48  efd_value_t value = 0;
49  uint32_t i = 0;
50  uint32x4_t vhash_val_a = vmovq_n_u32(hash_val_a);
51  uint32x4_t vhash_val_b = vmovq_n_u32(hash_val_b);
52  int32x4_t vshift = {0, 1, 2, 3};
53  uint32x4_t vmask = vdupq_n_u32(0x1);
54  int32x4_t vincr = vdupq_n_s32(4);
55 
56  for (; i < RTE_EFD_VALUE_NUM_BITS; i += 4) {
57  uint32x4_t vhash_idx = vshll_n_u16(
58  vld1_u16((uint16_t const *)&group_hash_idx[i]), 0);
59  uint32x4_t vlookup_table = vshll_n_u16(
60  vld1_u16((uint16_t const *)&group_lookup_table[i]), 0);
61  uint32x4_t vhash = vaddq_u32(vhash_val_a,
62  vmulq_u32(vhash_idx, vhash_val_b));
63  int32x4_t vbucket_idx = vnegq_s32(vreinterpretq_s32_u32(
64  vshrq_n_u32(vhash, EFD_LOOKUPTBL_SHIFT)));
65  uint32x4_t vresult = vshlq_u32(vlookup_table, vbucket_idx);
66 
67  vresult = vandq_u32(vresult, vmask);
68  vresult = vshlq_u32(vresult, vshift);
69  value |= vaddvq_u32(vresult);
70  vshift = vaddq_s32(vshift, vincr);
71  }
72 
73  return value;
74 }
75 
76 #endif /* __RTE_EFD_ARM64_H__ */
#define RTE_EFD_VALUE_NUM_BITS
Definition: rte_efd.h:94