1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2021 Intel Corporation
5 #ifndef _RTE_THASH_X86_GFNI_H_
6 #define _RTE_THASH_X86_GFNI_H_
11 * Optimized Toeplitz hash functions implementation
12 * using Galois Fields New Instructions.
21 #if defined(__GFNI__) && defined(__AVX512F__)
22 #define RTE_THASH_GFNI_DEFINED
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
32 __rte_thash_xor_reduce(__m512i xor_acc, uint32_t *val_1, uint32_t *val_2)
34 __m256i tmp_256_1, tmp_256_2;
35 __m128i tmp128_1, tmp128_2;
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);
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);
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);
51 *val_1 = (uint32_t)tmp_1;
52 *val_2 = (uint32_t)(tmp_1 >> 32);
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);
67 __rte_thash_gfni(const uint64_t *mtrx, const uint8_t *tuple,
68 const uint8_t *secondary_tuple, int len)
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, tuple_bytes_2;
91 __mmask64 load_mask, permute_mask, permute_mask_2;
92 int chunk_len = 0, i = 0;
94 const int prepend = 3;
96 for (; len > 0; len -= 64, tuple += 64) {
98 perm_bytes = _mm512_maskz_permutexvar_epi8(rewind_mask,
99 rewind_idx, perm_bytes);
101 permute_mask = RTE_THASH_FIRST_ITER_MSK;
102 load_mask = (len >= 64) ? UINT64_MAX : ((1ULL << len) - 1);
103 tuple_bytes = _mm512_maskz_loadu_epi8(load_mask, tuple);
104 if (secondary_tuple) {
105 permute_mask_2 = RTE_THASH_FIRST_ITER_MSK_2;
106 tuple_bytes_2 = _mm512_maskz_loadu_epi8(load_mask,
110 chunk_len = __builtin_popcountll(load_mask);
111 for (i = 0; i < ((chunk_len + prepend) / 8); i++, mtrx += 8) {
112 perm_bytes = _mm512_mask_permutexvar_epi8(perm_bytes,
113 permute_mask, permute_idx, tuple_bytes);
117 _mm512_mask_permutexvar_epi8(perm_bytes,
118 permute_mask_2, permute_idx,
121 matrixes = _mm512_maskz_loadu_epi64(UINT8_MAX, mtrx);
122 vals = _mm512_gf2p8affine_epi64_epi8(perm_bytes,
125 xor_acc = _mm512_xor_si512(xor_acc, vals);
126 permute_idx = _mm512_add_epi8(permute_idx, shift_8);
127 permute_mask = RTE_THASH_PERM_MSK;
129 permute_mask_2 = RTE_THASH_PERM_MSK_2;
133 int rest_len = (chunk_len + prepend) % 8;
135 mtrx_msk = (1 << (rest_len % 8)) - 1;
136 matrixes = _mm512_maskz_loadu_epi64(mtrx_msk, mtrx);
138 perm_bytes = _mm512_maskz_permutexvar_epi8(rewind_mask,
139 rewind_idx, perm_bytes);
141 perm_bytes = _mm512_mask_permutexvar_epi8(perm_bytes,
142 permute_mask, permute_idx, tuple_bytes);
146 _mm512_mask_permutexvar_epi8(
147 perm_bytes, permute_mask_2,
148 permute_idx, tuple_bytes_2);
151 vals = _mm512_gf2p8affine_epi64_epi8(perm_bytes, matrixes, 0);
152 xor_acc = _mm512_xor_si512(xor_acc, vals);
159 * Calculate Toeplitz hash.
162 * @b EXPERIMENTAL: this API may change without prior notice.
165 * Pointer to the matrices generated from the corresponding
166 * RSS hash key using rte_thash_complete_matrix().
167 * Note that @p len should not exceed the length of the rss_key minus 4.
169 * Pointer to the data to be hashed. Data must be in network byte order.
171 * Length of the data to be hashed.
173 * Calculated Toeplitz hash value.
176 static inline uint32_t
177 rte_thash_gfni(const uint64_t *m, const uint8_t *tuple, int len)
179 uint32_t val, val_zero;
181 __m512i xor_acc = __rte_thash_gfni(m, tuple, NULL, len);
182 __rte_thash_xor_reduce(xor_acc, &val, &val_zero);
188 * Bulk implementation for Toeplitz hash.
191 * @b EXPERIMENTAL: this API may change without prior notice.
194 * Pointer to the matrices generated from the corresponding
195 * RSS hash key using rte_thash_complete_matrix().
196 * Note that @p len should not exceed the length of the rss_key minus 4.
198 * Length of the largest data buffer to be hashed.
200 * Array of the pointers on data to be hashed.
201 * Data must be in network byte order.
203 * Array of uint32_t where to put calculated Toeplitz hash values
205 * Number of tuples to hash.
209 rte_thash_gfni_bulk(const uint64_t *mtrx, int len, uint8_t *tuple[],
210 uint32_t val[], uint32_t num)
216 for (i = 0; i != (num & ~1); i += 2) {
217 xor_acc = __rte_thash_gfni(mtrx, tuple[i], tuple[i + 1], len);
218 __rte_thash_xor_reduce(xor_acc, val + i, val + i + 1);
222 xor_acc = __rte_thash_gfni(mtrx, tuple[i], NULL, len);
223 __rte_thash_xor_reduce(xor_acc, val + i, &val_zero);
227 #endif /* __GFNI__ && __AVX512F__ */
233 #endif /* _RTE_THASH_X86_GFNI_H_ */