summaryrefslogtreecommitdiffstats
path: root/arch/s390/crypto/crc32-vx.c
blob: 577ae1d4ae894e58c5e0c37cec32f77341e18735 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
/*
 * Crypto-API module for CRC-32 algorithms implemented with the
 * z/Architecture Vector Extension Facility.
 *
 * Copyright IBM Corp. 2015
 * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
 */
#define KMSG_COMPONENT	"crc32-vx"
#define pr_fmt(fmt)	KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/cpufeature.h>
#include <linux/crc32.h>
#include <crypto/internal/hash.h>
#include <asm/fpu/api.h>


#define CRC32_BLOCK_SIZE	1
#define CRC32_DIGEST_SIZE	4

#define VX_MIN_LEN		64
#define VX_ALIGNMENT		16L
#define VX_ALIGN_MASK		(VX_ALIGNMENT - 1)

struct crc_ctx {
	u32 key;
};

struct crc_desc_ctx {
	u32 crc;
};

/* Prototypes for functions in assembly files */
u32 crc32_le_vgfm_16(u32 crc, unsigned char const *buf, size_t size);
u32 crc32_be_vgfm_16(u32 crc, unsigned char const *buf, size_t size);
u32 crc32c_le_vgfm_16(u32 crc, unsigned char const *buf, size_t size);

/*
 * DEFINE_CRC32_VX() - Define a CRC-32 function using the vector extension
 *
 * Creates a function to perform a particular CRC-32 computation. Depending
 * on the message buffer, the hardware-accelerated or software implementation
 * is used.   Note that the message buffer is aligned to improve fetch
 * operations of VECTOR LOAD MULTIPLE instructions.
 *
 */
#define DEFINE_CRC32_VX(___fname, ___crc32_vx, ___crc32_sw)		    \
	static u32 __pure ___fname(u32 crc,				    \
				unsigned char const *data, size_t datalen)  \
	{								    \
		struct kernel_fpu vxstate;				    \
		unsigned long prealign, aligned, remaining;		    \
									    \
		if ((unsigned long)data & VX_ALIGN_MASK) {		    \
			prealign = VX_ALIGNMENT -			    \
				  ((unsigned long)data & VX_ALIGN_MASK);    \
			datalen -= prealign;				    \
			crc = ___crc32_sw(crc, data, prealign);		    \
			data = (void *)((unsigned long)data + prealign);    \
		}							    \
									    \
		if (datalen < VX_MIN_LEN)				    \
			return ___crc32_sw(crc, data, datalen);		    \
									    \
		aligned = datalen & ~VX_ALIGN_MASK;			    \
		remaining = datalen & VX_ALIGN_MASK;			    \
									    \
		kernel_fpu_begin(&vxstate, KERNEL_VXR_LOW);		    \
		crc = ___crc32_vx(crc, data, aligned);			    \
		kernel_fpu_end(&vxstate);				    \
									    \
		if (remaining)						    \
			crc = ___crc32_sw(crc, data + aligned, remaining);  \
									    \
		return crc;						    \
	}

DEFINE_CRC32_VX(crc32_le_vx, crc32_le_vgfm_16, crc32_le)
DEFINE_CRC32_VX(crc32_be_vx, crc32_be_vgfm_16, crc32_be)
DEFINE_CRC32_VX(crc32c_le_vx, crc32c_le_vgfm_16, __crc32c_le)


static int crc32_vx_cra_init_zero(struct crypto_tfm *tfm)
{
	struct crc_ctx *mctx = crypto_tfm_ctx(tfm);

	mctx->key = 0;
	return 0;
}

static int crc32_vx_cra_init_invert(struct crypto_tfm *tfm)
{
	struct crc_ctx *mctx = crypto_tfm_ctx(tfm);

	mctx->key = ~0;
	return 0;
}

static int crc32_vx_init(struct shash_desc *desc)
{
	struct crc_ctx *mctx = crypto_shash_ctx(desc->tfm);
	struct crc_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = mctx->key;
	return 0;
}

static int crc32_vx_setkey(struct crypto_shash *tfm, const u8 *newkey,
			   unsigned int newkeylen)
{
	struct crc_ctx *mctx = crypto_shash_ctx(tfm);

	if (newkeylen != sizeof(mctx->key)) {
		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}
	mctx->key = le32_to_cpu(*(__le32 *)newkey);
	return 0;
}

static int crc32be_vx_setkey(struct crypto_shash *tfm, const u8 *newkey,
			     unsigned int newkeylen)
{
	struct crc_ctx *mctx = crypto_shash_ctx(tfm);

	if (newkeylen != sizeof(mctx->key)) {
		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}
	mctx->key = be32_to_cpu(*(__be32 *)newkey);
	return 0;
}

static int crc32le_vx_final(struct shash_desc *desc, u8 *out)
{
	struct crc_desc_ctx *ctx = shash_desc_ctx(desc);

	*(__le32 *)out = cpu_to_le32p(&ctx->crc);
	return 0;
}

static int crc32be_vx_final(struct shash_desc *desc, u8 *out)
{
	struct crc_desc_ctx *ctx = shash_desc_ctx(desc);

	*(__be32 *)out = cpu_to_be32p(&ctx->crc);
	return 0;
}

static int crc32c_vx_final(struct shash_desc *desc, u8 *out)
{
	struct crc_desc_ctx *ctx = shash_desc_ctx(desc);

	/*
	 * Perform a final XOR with 0xFFFFFFFF to be in sync
	 * with the generic crc32c shash implementation.
	 */
	*(__le32 *)out = ~cpu_to_le32p(&ctx->crc);
	return 0;
}

static int __crc32le_vx_finup(u32 *crc, const u8 *data, unsigned int len,
			      u8 *out)
{
	*(__le32 *)out = cpu_to_le32(crc32_le_vx(*crc, data, len));
	return 0;
}

static int __crc32be_vx_finup(u32 *crc, const u8 *data, unsigned int len,
			      u8 *out)
{
	*(__be32 *)out = cpu_to_be32(crc32_be_vx(*crc, data, len));
	return 0;
}

static int __crc32c_vx_finup(u32 *crc, const u8 *data, unsigned int len,
			     u8 *out)
{
	/*
	 * Perform a final XOR with 0xFFFFFFFF to be in sync
	 * with the generic crc32c shash implementation.
	 */
	*(__le32 *)out = ~cpu_to_le32(crc32c_le_vx(*crc, data, len));
	return 0;
}


#define CRC32_VX_FINUP(alg, func)					      \
	static int alg ## _vx_finup(struct shash_desc *desc, const u8 *data,  \
				   unsigned int datalen, u8 *out)	      \
	{								      \
		return __ ## alg ## _vx_finup(shash_desc_ctx(desc),	      \
					      data, datalen, out);	      \
	}

CRC32_VX_FINUP(crc32le, crc32_le_vx)
CRC32_VX_FINUP(crc32be, crc32_be_vx)
CRC32_VX_FINUP(crc32c, crc32c_le_vx)

#define CRC32_VX_DIGEST(alg, func)					      \
	static int alg ## _vx_digest(struct shash_desc *desc, const u8 *data, \
				     unsigned int len, u8 *out)		      \
	{								      \
		return __ ## alg ## _vx_finup(crypto_shash_ctx(desc->tfm),    \
					      data, len, out);		      \
	}

CRC32_VX_DIGEST(crc32le, crc32_le_vx)
CRC32_VX_DIGEST(crc32be, crc32_be_vx)
CRC32_VX_DIGEST(crc32c, crc32c_le_vx)

#define CRC32_VX_UPDATE(alg, func)					      \
	static int alg ## _vx_update(struct shash_desc *desc, const u8 *data, \
				     unsigned int datalen)		      \
	{								      \
		struct crc_desc_ctx *ctx = shash_desc_ctx(desc);	      \
		ctx->crc = func(ctx->crc, data, datalen);		      \
		return 0;						      \
	}

CRC32_VX_UPDATE(crc32le, crc32_le_vx)
CRC32_VX_UPDATE(crc32be, crc32_be_vx)
CRC32_VX_UPDATE(crc32c, crc32c_le_vx)


static struct shash_alg crc32_vx_algs[] = {
	/* CRC-32 LE */
	{
		.init		=	crc32_vx_init,
		.setkey		=	crc32_vx_setkey,
		.update		=	crc32le_vx_update,
		.final		=	crc32le_vx_final,
		.finup		=	crc32le_vx_finup,
		.digest		=	crc32le_vx_digest,
		.descsize	=	sizeof(struct crc_desc_ctx),
		.digestsize	=	CRC32_DIGEST_SIZE,
		.base		=	{
			.cra_name	 = "crc32",
			.cra_driver_name = "crc32-vx",
			.cra_priority	 = 200,
			.cra_blocksize	 = CRC32_BLOCK_SIZE,
			.cra_ctxsize	 = sizeof(struct crc_ctx),
			.cra_module	 = THIS_MODULE,
			.cra_init	 = crc32_vx_cra_init_zero,
		},
	},
	/* CRC-32 BE */
	{
		.init		=	crc32_vx_init,
		.setkey		=	crc32be_vx_setkey,
		.update		=	crc32be_vx_update,
		.final		=	crc32be_vx_final,
		.finup		=	crc32be_vx_finup,
		.digest		=	crc32be_vx_digest,
		.descsize	=	sizeof(struct crc_desc_ctx),
		.digestsize	=	CRC32_DIGEST_SIZE,
		.base		=	{
			.cra_name	 = "crc32be",
			.cra_driver_name = "crc32be-vx",
			.cra_priority	 = 200,
			.cra_blocksize	 = CRC32_BLOCK_SIZE,
			.cra_ctxsize	 = sizeof(struct crc_ctx),
			.cra_module	 = THIS_MODULE,
			.cra_init	 = crc32_vx_cra_init_zero,
		},
	},
	/* CRC-32C LE */
	{
		.init		=	crc32_vx_init,
		.setkey		=	crc32_vx_setkey,
		.update		=	crc32c_vx_update,
		.final		=	crc32c_vx_final,
		.finup		=	crc32c_vx_finup,
		.digest		=	crc32c_vx_digest,
		.descsize	=	sizeof(struct crc_desc_ctx),
		.digestsize	=	CRC32_DIGEST_SIZE,
		.base		=	{
			.cra_name	 = "crc32c",
			.cra_driver_name = "crc32c-vx",
			.cra_priority	 = 200,
			.cra_blocksize	 = CRC32_BLOCK_SIZE,
			.cra_ctxsize	 = sizeof(struct crc_ctx),
			.cra_module	 = THIS_MODULE,
			.cra_init	 = crc32_vx_cra_init_invert,
		},
	},
};


static int __init crc_vx_mod_init(void)
{
	return crypto_register_shashes(crc32_vx_algs,
				       ARRAY_SIZE(crc32_vx_algs));
}

static void __exit crc_vx_mod_exit(void)
{
	crypto_unregister_shashes(crc32_vx_algs, ARRAY_SIZE(crc32_vx_algs));
}

module_cpu_feature_match(VXRS, crc_vx_mod_init);
module_exit(crc_vx_mod_exit);

MODULE_AUTHOR("Hendrik Brueckner <brueckner@linux.vnet.ibm.com>");
MODULE_LICENSE("GPL");

MODULE_ALIAS_CRYPTO("crc32");
MODULE_ALIAS_CRYPTO("crc32-vx");
MODULE_ALIAS_CRYPTO("crc32c");
MODULE_ALIAS_CRYPTO("crc32c-vx");