lib/librte_efd/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__ */