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rte_thash_x86_gfni.h
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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_compat.h>
16#include <rte_vect.h>
17
18#ifdef __cplusplus
19extern "C" {
20#endif
21
22#if defined(__GFNI__) && defined(__AVX512F__)
23#define RTE_THASH_GFNI_DEFINED
24
25#define RTE_THASH_FIRST_ITER_MSK 0x0f0f0f0f0f0e0c08
26#define RTE_THASH_PERM_MSK 0x0f0f0f0f0f0f0f0f
27#define RTE_THASH_FIRST_ITER_MSK_2 0xf0f0f0f0f0e0c080
28#define RTE_THASH_PERM_MSK_2 0xf0f0f0f0f0f0f0f0
29#define RTE_THASH_REWIND_MSK 0x0000000000113377
30
31__rte_internal
32static inline void
33__rte_thash_xor_reduce(__m512i xor_acc, uint32_t *val_1, uint32_t *val_2)
34{
35 __m256i tmp_256_1, tmp_256_2;
36 __m128i tmp128_1, tmp128_2;
37
38 tmp_256_1 = _mm512_castsi512_si256(xor_acc);
39 tmp_256_2 = _mm512_extracti32x8_epi32(xor_acc, 1);
40 tmp_256_1 = _mm256_xor_si256(tmp_256_1, tmp_256_2);
41
42 tmp128_1 = _mm256_castsi256_si128(tmp_256_1);
43 tmp128_2 = _mm256_extracti32x4_epi32(tmp_256_1, 1);
44 tmp128_1 = _mm_xor_si128(tmp128_1, tmp128_2);
45
46#ifdef RTE_ARCH_X86_64
47 uint64_t tmp_1, tmp_2;
48 tmp_1 = _mm_extract_epi64(tmp128_1, 0);
49 tmp_2 = _mm_extract_epi64(tmp128_1, 1);
50 tmp_1 ^= tmp_2;
51
52 *val_1 = (uint32_t)tmp_1;
53 *val_2 = (uint32_t)(tmp_1 >> 32);
54#else
55 uint32_t tmp_1, tmp_2;
56 tmp_1 = _mm_extract_epi32(tmp128_1, 0);
57 tmp_2 = _mm_extract_epi32(tmp128_1, 1);
58 tmp_1 ^= _mm_extract_epi32(tmp128_1, 2);
59 tmp_2 ^= _mm_extract_epi32(tmp128_1, 3);
60
61 *val_1 = tmp_1;
62 *val_2 = tmp_2;
63#endif
64}
65
66__rte_internal
67static inline __m512i
68__rte_thash_gfni(const uint64_t *mtrx, const uint8_t *tuple,
69 const uint8_t *secondary_tuple, int len)
70{
71 __m512i permute_idx = _mm512_set_epi32(0x07060504, 0x07060504,
72 0x06050403, 0x06050403,
73 0x05040302, 0x05040302,
74 0x04030201, 0x04030201,
75 0x03020100, 0x03020100,
76 0x020100FF, 0x020100FF,
77 0x0100FFFE, 0x0100FFFE,
78 0x00FFFEFD, 0x00FFFEFD);
79 const __m512i rewind_idx = _mm512_set_epi32(0x00000000, 0x00000000,
80 0x00000000, 0x00000000,
81 0x00000000, 0x00000000,
82 0x00000000, 0x00000000,
83 0x00000000, 0x00000000,
84 0x0000003B, 0x0000003B,
85 0x00003B3A, 0x00003B3A,
86 0x003B3A39, 0x003B3A39);
87 const __mmask64 rewind_mask = RTE_THASH_REWIND_MSK;
88 const __m512i shift_8 = _mm512_set1_epi8(8);
89 __m512i xor_acc = _mm512_setzero_si512();
90 __m512i perm_bytes = _mm512_setzero_si512();
91 __m512i vals, matrixes, tuple_bytes_2;
92 __m512i tuple_bytes = _mm512_setzero_si512();
93 __mmask64 load_mask, permute_mask_2;
94 __mmask64 permute_mask = 0;
95 int chunk_len = 0, i = 0;
96 uint8_t mtrx_msk;
97 const int prepend = 3;
98
99 for (; len > 0; len -= 64, tuple += 64) {
100 if (i == 8)
101 perm_bytes = _mm512_maskz_permutexvar_epi8(rewind_mask,
102 rewind_idx, perm_bytes);
103
104 permute_mask = RTE_THASH_FIRST_ITER_MSK;
105 load_mask = (len >= 64) ? UINT64_MAX : ((1ULL << len) - 1);
106 tuple_bytes = _mm512_maskz_loadu_epi8(load_mask, tuple);
107 if (secondary_tuple) {
108 permute_mask_2 = RTE_THASH_FIRST_ITER_MSK_2;
109 tuple_bytes_2 = _mm512_maskz_loadu_epi8(load_mask,
110 secondary_tuple);
111 }
112
113 chunk_len = __builtin_popcountll(load_mask);
114 for (i = 0; i < ((chunk_len + prepend) / 8); i++, mtrx += 8) {
115 perm_bytes = _mm512_mask_permutexvar_epi8(perm_bytes,
116 permute_mask, permute_idx, tuple_bytes);
117
118 if (secondary_tuple)
119 perm_bytes =
120 _mm512_mask_permutexvar_epi8(perm_bytes,
121 permute_mask_2, permute_idx,
122 tuple_bytes_2);
123
124 matrixes = _mm512_maskz_loadu_epi64(UINT8_MAX, mtrx);
125 vals = _mm512_gf2p8affine_epi64_epi8(perm_bytes,
126 matrixes, 0);
127
128 xor_acc = _mm512_xor_si512(xor_acc, vals);
129 permute_idx = _mm512_add_epi8(permute_idx, shift_8);
130 permute_mask = RTE_THASH_PERM_MSK;
131 if (secondary_tuple)
132 permute_mask_2 = RTE_THASH_PERM_MSK_2;
133 }
134 }
135
136 int rest_len = (chunk_len + prepend) % 8;
137 if (rest_len != 0) {
138 mtrx_msk = (1 << (rest_len % 8)) - 1;
139 matrixes = _mm512_maskz_loadu_epi64(mtrx_msk, mtrx);
140 if (i == 8) {
141 perm_bytes = _mm512_maskz_permutexvar_epi8(rewind_mask,
142 rewind_idx, perm_bytes);
143 } else {
144 perm_bytes = _mm512_mask_permutexvar_epi8(perm_bytes,
145 permute_mask, permute_idx, tuple_bytes);
146
147 if (secondary_tuple)
148 perm_bytes =
149 _mm512_mask_permutexvar_epi8(
150 perm_bytes, permute_mask_2,
151 permute_idx, tuple_bytes_2);
152 }
153
154 vals = _mm512_gf2p8affine_epi64_epi8(perm_bytes, matrixes, 0);
155 xor_acc = _mm512_xor_si512(xor_acc, vals);
156 }
157
158 return xor_acc;
159}
160
178__rte_experimental
179static inline uint32_t
180rte_thash_gfni(const uint64_t *m, const uint8_t *tuple, int len)
181{
182 uint32_t val, val_zero;
183
184 __m512i xor_acc = __rte_thash_gfni(m, tuple, NULL, len);
185 __rte_thash_xor_reduce(xor_acc, &val, &val_zero);
186
187 return val;
188}
189
210__rte_experimental
211static inline void
212rte_thash_gfni_bulk(const uint64_t *mtrx, int len, uint8_t *tuple[],
213 uint32_t val[], uint32_t num)
214{
215 uint32_t i;
216 uint32_t val_zero;
217 __m512i xor_acc;
218
219 for (i = 0; i != (num & ~1); i += 2) {
220 xor_acc = __rte_thash_gfni(mtrx, tuple[i], tuple[i + 1], len);
221 __rte_thash_xor_reduce(xor_acc, val + i, val + i + 1);
222 }
223
224 if (num & 1) {
225 xor_acc = __rte_thash_gfni(mtrx, tuple[i], NULL, len);
226 __rte_thash_xor_reduce(xor_acc, val + i, &val_zero);
227 }
228}
229
230#endif /* __GFNI__ && __AVX512F__ */
231
232#ifdef __cplusplus
233}
234#endif
235
236#endif /* _RTE_THASH_X86_GFNI_H_ */
rte_vect.h
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