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f848dbd3 HB |
1 | /* |
2 | * Crypto-API module for CRC-32 algorithms implemented with the | |
3 | * z/Architecture Vector Extension Facility. | |
4 | * | |
5 | * Copyright IBM Corp. 2015 | |
6 | * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | |
7 | */ | |
8 | #define KMSG_COMPONENT "crc32-vx" | |
9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/cpufeature.h> | |
13 | #include <linux/crc32.h> | |
14 | #include <crypto/internal/hash.h> | |
15 | #include <asm/fpu/api.h> | |
16 | ||
17 | ||
18 | #define CRC32_BLOCK_SIZE 1 | |
19 | #define CRC32_DIGEST_SIZE 4 | |
20 | ||
21 | #define VX_MIN_LEN 64 | |
22 | #define VX_ALIGNMENT 16L | |
23 | #define VX_ALIGN_MASK (VX_ALIGNMENT - 1) | |
24 | ||
25 | struct crc_ctx { | |
26 | u32 key; | |
27 | }; | |
28 | ||
29 | struct crc_desc_ctx { | |
30 | u32 crc; | |
31 | }; | |
32 | ||
33 | /* Prototypes for functions in assembly files */ | |
34 | u32 crc32_le_vgfm_16(u32 crc, unsigned char const *buf, size_t size); | |
35 | u32 crc32_be_vgfm_16(u32 crc, unsigned char const *buf, size_t size); | |
36 | u32 crc32c_le_vgfm_16(u32 crc, unsigned char const *buf, size_t size); | |
37 | ||
38 | /* | |
39 | * DEFINE_CRC32_VX() - Define a CRC-32 function using the vector extension | |
40 | * | |
41 | * Creates a function to perform a particular CRC-32 computation. Depending | |
42 | * on the message buffer, the hardware-accelerated or software implementation | |
43 | * is used. Note that the message buffer is aligned to improve fetch | |
44 | * operations of VECTOR LOAD MULTIPLE instructions. | |
45 | * | |
46 | */ | |
47 | #define DEFINE_CRC32_VX(___fname, ___crc32_vx, ___crc32_sw) \ | |
48 | static u32 __pure ___fname(u32 crc, \ | |
49 | unsigned char const *data, size_t datalen) \ | |
50 | { \ | |
51 | struct kernel_fpu vxstate; \ | |
52 | unsigned long prealign, aligned, remaining; \ | |
53 | \ | |
54 | if ((unsigned long)data & VX_ALIGN_MASK) { \ | |
55 | prealign = VX_ALIGNMENT - \ | |
56 | ((unsigned long)data & VX_ALIGN_MASK); \ | |
57 | datalen -= prealign; \ | |
58 | crc = ___crc32_sw(crc, data, prealign); \ | |
59 | data = (void *)((unsigned long)data + prealign); \ | |
60 | } \ | |
61 | \ | |
62 | if (datalen < VX_MIN_LEN) \ | |
63 | return ___crc32_sw(crc, data, datalen); \ | |
64 | \ | |
65 | aligned = datalen & ~VX_ALIGN_MASK; \ | |
66 | remaining = datalen & VX_ALIGN_MASK; \ | |
67 | \ | |
68 | kernel_fpu_begin(&vxstate, KERNEL_VXR_LOW); \ | |
69 | crc = ___crc32_vx(crc, data, aligned); \ | |
70 | kernel_fpu_end(&vxstate); \ | |
71 | \ | |
72 | if (remaining) \ | |
73 | crc = ___crc32_sw(crc, data + aligned, remaining); \ | |
74 | \ | |
75 | return crc; \ | |
76 | } | |
77 | ||
78 | DEFINE_CRC32_VX(crc32_le_vx, crc32_le_vgfm_16, crc32_le) | |
79 | DEFINE_CRC32_VX(crc32_be_vx, crc32_be_vgfm_16, crc32_be) | |
80 | DEFINE_CRC32_VX(crc32c_le_vx, crc32c_le_vgfm_16, __crc32c_le) | |
81 | ||
82 | ||
83 | static int crc32_vx_cra_init_zero(struct crypto_tfm *tfm) | |
84 | { | |
85 | struct crc_ctx *mctx = crypto_tfm_ctx(tfm); | |
86 | ||
87 | mctx->key = 0; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static int crc32_vx_cra_init_invert(struct crypto_tfm *tfm) | |
92 | { | |
93 | struct crc_ctx *mctx = crypto_tfm_ctx(tfm); | |
94 | ||
95 | mctx->key = ~0; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static int crc32_vx_init(struct shash_desc *desc) | |
100 | { | |
101 | struct crc_ctx *mctx = crypto_shash_ctx(desc->tfm); | |
102 | struct crc_desc_ctx *ctx = shash_desc_ctx(desc); | |
103 | ||
104 | ctx->crc = mctx->key; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static int crc32_vx_setkey(struct crypto_shash *tfm, const u8 *newkey, | |
109 | unsigned int newkeylen) | |
110 | { | |
111 | struct crc_ctx *mctx = crypto_shash_ctx(tfm); | |
112 | ||
113 | if (newkeylen != sizeof(mctx->key)) { | |
114 | crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
115 | return -EINVAL; | |
116 | } | |
117 | mctx->key = le32_to_cpu(*(__le32 *)newkey); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int crc32be_vx_setkey(struct crypto_shash *tfm, const u8 *newkey, | |
122 | unsigned int newkeylen) | |
123 | { | |
124 | struct crc_ctx *mctx = crypto_shash_ctx(tfm); | |
125 | ||
126 | if (newkeylen != sizeof(mctx->key)) { | |
127 | crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
128 | return -EINVAL; | |
129 | } | |
130 | mctx->key = be32_to_cpu(*(__be32 *)newkey); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int crc32le_vx_final(struct shash_desc *desc, u8 *out) | |
135 | { | |
136 | struct crc_desc_ctx *ctx = shash_desc_ctx(desc); | |
137 | ||
138 | *(__le32 *)out = cpu_to_le32p(&ctx->crc); | |
139 | return 0; | |
140 | } | |
141 | ||
142 | static int crc32be_vx_final(struct shash_desc *desc, u8 *out) | |
143 | { | |
144 | struct crc_desc_ctx *ctx = shash_desc_ctx(desc); | |
145 | ||
146 | *(__be32 *)out = cpu_to_be32p(&ctx->crc); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int crc32c_vx_final(struct shash_desc *desc, u8 *out) | |
151 | { | |
152 | struct crc_desc_ctx *ctx = shash_desc_ctx(desc); | |
153 | ||
154 | /* | |
155 | * Perform a final XOR with 0xFFFFFFFF to be in sync | |
156 | * with the generic crc32c shash implementation. | |
157 | */ | |
158 | *(__le32 *)out = ~cpu_to_le32p(&ctx->crc); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static int __crc32le_vx_finup(u32 *crc, const u8 *data, unsigned int len, | |
163 | u8 *out) | |
164 | { | |
165 | *(__le32 *)out = cpu_to_le32(crc32_le_vx(*crc, data, len)); | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int __crc32be_vx_finup(u32 *crc, const u8 *data, unsigned int len, | |
170 | u8 *out) | |
171 | { | |
172 | *(__be32 *)out = cpu_to_be32(crc32_be_vx(*crc, data, len)); | |
173 | return 0; | |
174 | } | |
175 | ||
176 | static int __crc32c_vx_finup(u32 *crc, const u8 *data, unsigned int len, | |
177 | u8 *out) | |
178 | { | |
179 | /* | |
180 | * Perform a final XOR with 0xFFFFFFFF to be in sync | |
181 | * with the generic crc32c shash implementation. | |
182 | */ | |
183 | *(__le32 *)out = ~cpu_to_le32(crc32c_le_vx(*crc, data, len)); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | ||
188 | #define CRC32_VX_FINUP(alg, func) \ | |
189 | static int alg ## _vx_finup(struct shash_desc *desc, const u8 *data, \ | |
190 | unsigned int datalen, u8 *out) \ | |
191 | { \ | |
192 | return __ ## alg ## _vx_finup(shash_desc_ctx(desc), \ | |
193 | data, datalen, out); \ | |
194 | } | |
195 | ||
196 | CRC32_VX_FINUP(crc32le, crc32_le_vx) | |
197 | CRC32_VX_FINUP(crc32be, crc32_be_vx) | |
198 | CRC32_VX_FINUP(crc32c, crc32c_le_vx) | |
199 | ||
200 | #define CRC32_VX_DIGEST(alg, func) \ | |
201 | static int alg ## _vx_digest(struct shash_desc *desc, const u8 *data, \ | |
202 | unsigned int len, u8 *out) \ | |
203 | { \ | |
204 | return __ ## alg ## _vx_finup(crypto_shash_ctx(desc->tfm), \ | |
205 | data, len, out); \ | |
206 | } | |
207 | ||
208 | CRC32_VX_DIGEST(crc32le, crc32_le_vx) | |
209 | CRC32_VX_DIGEST(crc32be, crc32_be_vx) | |
210 | CRC32_VX_DIGEST(crc32c, crc32c_le_vx) | |
211 | ||
212 | #define CRC32_VX_UPDATE(alg, func) \ | |
213 | static int alg ## _vx_update(struct shash_desc *desc, const u8 *data, \ | |
214 | unsigned int datalen) \ | |
215 | { \ | |
216 | struct crc_desc_ctx *ctx = shash_desc_ctx(desc); \ | |
217 | ctx->crc = func(ctx->crc, data, datalen); \ | |
218 | return 0; \ | |
219 | } | |
220 | ||
221 | CRC32_VX_UPDATE(crc32le, crc32_le_vx) | |
222 | CRC32_VX_UPDATE(crc32be, crc32_be_vx) | |
223 | CRC32_VX_UPDATE(crc32c, crc32c_le_vx) | |
224 | ||
225 | ||
226 | static struct shash_alg crc32_vx_algs[] = { | |
227 | /* CRC-32 LE */ | |
228 | { | |
229 | .init = crc32_vx_init, | |
230 | .setkey = crc32_vx_setkey, | |
231 | .update = crc32le_vx_update, | |
232 | .final = crc32le_vx_final, | |
233 | .finup = crc32le_vx_finup, | |
234 | .digest = crc32le_vx_digest, | |
235 | .descsize = sizeof(struct crc_desc_ctx), | |
236 | .digestsize = CRC32_DIGEST_SIZE, | |
237 | .base = { | |
238 | .cra_name = "crc32", | |
239 | .cra_driver_name = "crc32-vx", | |
240 | .cra_priority = 200, | |
241 | .cra_blocksize = CRC32_BLOCK_SIZE, | |
242 | .cra_ctxsize = sizeof(struct crc_ctx), | |
243 | .cra_module = THIS_MODULE, | |
244 | .cra_init = crc32_vx_cra_init_zero, | |
245 | }, | |
246 | }, | |
247 | /* CRC-32 BE */ | |
248 | { | |
249 | .init = crc32_vx_init, | |
250 | .setkey = crc32be_vx_setkey, | |
251 | .update = crc32be_vx_update, | |
252 | .final = crc32be_vx_final, | |
253 | .finup = crc32be_vx_finup, | |
254 | .digest = crc32be_vx_digest, | |
255 | .descsize = sizeof(struct crc_desc_ctx), | |
256 | .digestsize = CRC32_DIGEST_SIZE, | |
257 | .base = { | |
258 | .cra_name = "crc32be", | |
259 | .cra_driver_name = "crc32be-vx", | |
260 | .cra_priority = 200, | |
261 | .cra_blocksize = CRC32_BLOCK_SIZE, | |
262 | .cra_ctxsize = sizeof(struct crc_ctx), | |
263 | .cra_module = THIS_MODULE, | |
264 | .cra_init = crc32_vx_cra_init_zero, | |
265 | }, | |
266 | }, | |
267 | /* CRC-32C LE */ | |
268 | { | |
269 | .init = crc32_vx_init, | |
270 | .setkey = crc32_vx_setkey, | |
271 | .update = crc32c_vx_update, | |
272 | .final = crc32c_vx_final, | |
273 | .finup = crc32c_vx_finup, | |
274 | .digest = crc32c_vx_digest, | |
275 | .descsize = sizeof(struct crc_desc_ctx), | |
276 | .digestsize = CRC32_DIGEST_SIZE, | |
277 | .base = { | |
278 | .cra_name = "crc32c", | |
279 | .cra_driver_name = "crc32c-vx", | |
280 | .cra_priority = 200, | |
281 | .cra_blocksize = CRC32_BLOCK_SIZE, | |
282 | .cra_ctxsize = sizeof(struct crc_ctx), | |
283 | .cra_module = THIS_MODULE, | |
284 | .cra_init = crc32_vx_cra_init_invert, | |
285 | }, | |
286 | }, | |
287 | }; | |
288 | ||
289 | ||
290 | static int __init crc_vx_mod_init(void) | |
291 | { | |
292 | return crypto_register_shashes(crc32_vx_algs, | |
293 | ARRAY_SIZE(crc32_vx_algs)); | |
294 | } | |
295 | ||
296 | static void __exit crc_vx_mod_exit(void) | |
297 | { | |
298 | crypto_unregister_shashes(crc32_vx_algs, ARRAY_SIZE(crc32_vx_algs)); | |
299 | } | |
300 | ||
301 | module_cpu_feature_match(VXRS, crc_vx_mod_init); | |
302 | module_exit(crc_vx_mod_exit); | |
303 | ||
304 | MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>"); | |
305 | MODULE_LICENSE("GPL"); | |
306 | ||
307 | MODULE_ALIAS_CRYPTO("crc32"); | |
308 | MODULE_ALIAS_CRYPTO("crc32-vx"); | |
309 | MODULE_ALIAS_CRYPTO("crc32c"); | |
310 | MODULE_ALIAS_CRYPTO("crc32c-vx"); |