DPDK  21.11.7
rte_thash_x86_gfni.h
Go to the documentation of this file.
1 /* SPDX-License-Identifier: BSD-3-Clause
2  * Copyright(c) 2021 Intel Corporation
3  */
4 
5 #ifndef _RTE_THASH_X86_GFNI_H_
6 #define _RTE_THASH_X86_GFNI_H_
7 
15 #include <rte_vect.h>
16 
17 #ifdef __cplusplus
18 extern "C" {
19 #endif
20 
21 #if defined(__GFNI__) && defined(__AVX512F__)
22 #define RTE_THASH_GFNI_DEFINED
23 
24 #define RTE_THASH_FIRST_ITER_MSK 0x0f0f0f0f0f0e0c08
25 #define RTE_THASH_PERM_MSK 0x0f0f0f0f0f0f0f0f
26 #define RTE_THASH_FIRST_ITER_MSK_2 0xf0f0f0f0f0e0c080
27 #define RTE_THASH_PERM_MSK_2 0xf0f0f0f0f0f0f0f0
28 #define RTE_THASH_REWIND_MSK 0x0000000000113377
29 
30 __rte_internal
31 static inline void
32 __rte_thash_xor_reduce(__m512i xor_acc, uint32_t *val_1, uint32_t *val_2)
33 {
34  __m256i tmp_256_1, tmp_256_2;
35  __m128i tmp128_1, tmp128_2;
36 
37  tmp_256_1 = _mm512_castsi512_si256(xor_acc);
38  tmp_256_2 = _mm512_extracti32x8_epi32(xor_acc, 1);
39  tmp_256_1 = _mm256_xor_si256(tmp_256_1, tmp_256_2);
40 
41  tmp128_1 = _mm256_castsi256_si128(tmp_256_1);
42  tmp128_2 = _mm256_extracti32x4_epi32(tmp_256_1, 1);
43  tmp128_1 = _mm_xor_si128(tmp128_1, tmp128_2);
44 
45 #ifdef RTE_ARCH_X86_64
46  uint64_t tmp_1, tmp_2;
47  tmp_1 = _mm_extract_epi64(tmp128_1, 0);
48  tmp_2 = _mm_extract_epi64(tmp128_1, 1);
49  tmp_1 ^= tmp_2;
50 
51  *val_1 = (uint32_t)tmp_1;
52  *val_2 = (uint32_t)(tmp_1 >> 32);
53 #else
54  uint32_t tmp_1, tmp_2;
55  tmp_1 = _mm_extract_epi32(tmp128_1, 0);
56  tmp_2 = _mm_extract_epi32(tmp128_1, 1);
57  tmp_1 ^= _mm_extract_epi32(tmp128_1, 2);
58  tmp_2 ^= _mm_extract_epi32(tmp128_1, 3);
59 
60  *val_1 = tmp_1;
61  *val_2 = tmp_2;
62 #endif
63 }
64 
65 __rte_internal
66 static inline __m512i
67 __rte_thash_gfni(const uint64_t *mtrx, const uint8_t *tuple,
68  const uint8_t *secondary_tuple, int len)
69 {
70  __m512i permute_idx = _mm512_set_epi32(0x07060504, 0x07060504,
71  0x06050403, 0x06050403,
72  0x05040302, 0x05040302,
73  0x04030201, 0x04030201,
74  0x03020100, 0x03020100,
75  0x020100FF, 0x020100FF,
76  0x0100FFFE, 0x0100FFFE,
77  0x00FFFEFD, 0x00FFFEFD);
78  const __m512i rewind_idx = _mm512_set_epi32(0x00000000, 0x00000000,
79  0x00000000, 0x00000000,
80  0x00000000, 0x00000000,
81  0x00000000, 0x00000000,
82  0x00000000, 0x00000000,
83  0x0000003B, 0x0000003B,
84  0x00003B3A, 0x00003B3A,
85  0x003B3A39, 0x003B3A39);
86  const __mmask64 rewind_mask = RTE_THASH_REWIND_MSK;
87  const __m512i shift_8 = _mm512_set1_epi8(8);
88  __m512i xor_acc = _mm512_setzero_si512();
89  __m512i perm_bytes = _mm512_setzero_si512();
90  __m512i vals, matrixes, tuple_bytes_2;
91  __m512i tuple_bytes = _mm512_setzero_si512();
92  __mmask64 load_mask, permute_mask_2;
93  __mmask64 permute_mask = 0;
94  int chunk_len = 0, i = 0;
95  uint8_t mtrx_msk;
96  const int prepend = 3;
97 
98  for (; len > 0; len -= 64, tuple += 64) {
99  if (i == 8)
100  perm_bytes = _mm512_maskz_permutexvar_epi8(rewind_mask,
101  rewind_idx, perm_bytes);
102 
103  permute_mask = RTE_THASH_FIRST_ITER_MSK;
104  load_mask = (len >= 64) ? UINT64_MAX : ((1ULL << len) - 1);
105  tuple_bytes = _mm512_maskz_loadu_epi8(load_mask, tuple);
106  if (secondary_tuple) {
107  permute_mask_2 = RTE_THASH_FIRST_ITER_MSK_2;
108  tuple_bytes_2 = _mm512_maskz_loadu_epi8(load_mask,
109  secondary_tuple);
110  }
111 
112  chunk_len = __builtin_popcountll(load_mask);
113  for (i = 0; i < ((chunk_len + prepend) / 8); i++, mtrx += 8) {
114  perm_bytes = _mm512_mask_permutexvar_epi8(perm_bytes,
115  permute_mask, permute_idx, tuple_bytes);
116 
117  if (secondary_tuple)
118  perm_bytes =
119  _mm512_mask_permutexvar_epi8(perm_bytes,
120  permute_mask_2, permute_idx,
121  tuple_bytes_2);
122 
123  matrixes = _mm512_maskz_loadu_epi64(UINT8_MAX, mtrx);
124  vals = _mm512_gf2p8affine_epi64_epi8(perm_bytes,
125  matrixes, 0);
126 
127  xor_acc = _mm512_xor_si512(xor_acc, vals);
128  permute_idx = _mm512_add_epi8(permute_idx, shift_8);
129  permute_mask = RTE_THASH_PERM_MSK;
130  if (secondary_tuple)
131  permute_mask_2 = RTE_THASH_PERM_MSK_2;
132  }
133  }
134 
135  int rest_len = (chunk_len + prepend) % 8;
136  if (rest_len != 0) {
137  mtrx_msk = (1 << (rest_len % 8)) - 1;
138  matrixes = _mm512_maskz_loadu_epi64(mtrx_msk, mtrx);
139  if (i == 8) {
140  perm_bytes = _mm512_maskz_permutexvar_epi8(rewind_mask,
141  rewind_idx, perm_bytes);
142  } else {
143  perm_bytes = _mm512_mask_permutexvar_epi8(perm_bytes,
144  permute_mask, permute_idx, tuple_bytes);
145 
146  if (secondary_tuple)
147  perm_bytes =
148  _mm512_mask_permutexvar_epi8(
149  perm_bytes, permute_mask_2,
150  permute_idx, tuple_bytes_2);
151  }
152 
153  vals = _mm512_gf2p8affine_epi64_epi8(perm_bytes, matrixes, 0);
154  xor_acc = _mm512_xor_si512(xor_acc, vals);
155  }
156 
157  return xor_acc;
158 }
159 
177 __rte_experimental
178 static inline uint32_t
179 rte_thash_gfni(const uint64_t *m, const uint8_t *tuple, int len)
180 {
181  uint32_t val, val_zero;
182 
183  __m512i xor_acc = __rte_thash_gfni(m, tuple, NULL, len);
184  __rte_thash_xor_reduce(xor_acc, &val, &val_zero);
185 
186  return val;
187 }
188 
209 __rte_experimental
210 static inline void
211 rte_thash_gfni_bulk(const uint64_t *mtrx, int len, uint8_t *tuple[],
212  uint32_t val[], uint32_t num)
213 {
214  uint32_t i;
215  uint32_t val_zero;
216  __m512i xor_acc;
217 
218  for (i = 0; i != (num & ~1); i += 2) {
219  xor_acc = __rte_thash_gfni(mtrx, tuple[i], tuple[i + 1], len);
220  __rte_thash_xor_reduce(xor_acc, val + i, val + i + 1);
221  }
222 
223  if (num & 1) {
224  xor_acc = __rte_thash_gfni(mtrx, tuple[i], NULL, len);
225  __rte_thash_xor_reduce(xor_acc, val + i, &val_zero);
226  }
227 }
228 
229 #endif /* __GFNI__ && __AVX512F__ */
230 
231 #ifdef __cplusplus
232 }
233 #endif
234 
235 #endif /* _RTE_THASH_X86_GFNI_H_ */
rte_vect.h
Generated by   doxygen 1.8.13