DPDK  19.08.2
rte_efd_arm64.h
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright(c) 2017 Cavium, Inc
3  */
4 
5 /*
6  * rte_efd_arm64.h
7  * This file holds all arm64 specific EFD functions
8  */
9 
10 #ifndef __RTE_EFD_ARM64_H__
11 #define __RTE_EFD_ARM64_H__
12 
13 #include <rte_vect.h>
14 
15 static inline efd_value_t
16 efd_lookup_internal_neon(const efd_hashfunc_t *group_hash_idx,
17  const efd_lookuptbl_t *group_lookup_table,
18  const uint32_t hash_val_a, const uint32_t hash_val_b)
19 {
20  efd_value_t value = 0;
21  uint32_t i = 0;
22  uint32x4_t vhash_val_a = vmovq_n_u32(hash_val_a);
23  uint32x4_t vhash_val_b = vmovq_n_u32(hash_val_b);
24  int32x4_t vshift = {0, 1, 2, 3};
25  uint32x4_t vmask = vdupq_n_u32(0x1);
26  int32x4_t vincr = vdupq_n_s32(4);
27 
28  for (; i < RTE_EFD_VALUE_NUM_BITS; i += 4) {
29  uint32x4_t vhash_idx = vshll_n_u16(
30  vld1_u16((uint16_t const *)&group_hash_idx[i]), 0);
31  uint32x4_t vlookup_table = vshll_n_u16(
32  vld1_u16((uint16_t const *)&group_lookup_table[i]), 0);
33  uint32x4_t vhash = vaddq_u32(vhash_val_a,
34  vmulq_u32(vhash_idx, vhash_val_b));
35  int32x4_t vbucket_idx = vnegq_s32(vreinterpretq_s32_u32(
36  vshrq_n_u32(vhash, EFD_LOOKUPTBL_SHIFT)));
37  uint32x4_t vresult = vshlq_u32(vlookup_table, vbucket_idx);
38 
39  vresult = vandq_u32(vresult, vmask);
40  vresult = vshlq_u32(vresult, vshift);
41  value |= vaddvq_u32(vresult);
42  vshift = vaddq_s32(vshift, vincr);
43  }
44 
45  return value;
46 }
47 
48 #endif /* __RTE_EFD_ARM64_H__ */
#define RTE_EFD_VALUE_NUM_BITS
Definition: rte_efd.h:65