summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/cavium/cpt/cptvf_algs.c
blob: 9eca0c30218669e64b8a6e83386ce587aace4169 (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
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
// SPDX-License-Identifier: GPL-2.0-only

/*
 * Copyright (C) 2016 Cavium, Inc.
 */

#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/authenc.h>
#include <crypto/internal/des.h>
#include <crypto/xts.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/scatterlist.h>

#include "cptvf.h"
#include "cptvf_algs.h"

struct cpt_device_handle {
	void *cdev[MAX_DEVICES];
	u32 dev_count;
};

static struct cpt_device_handle dev_handle;

static void cvm_callback(u32 status, void *arg)
{
	struct crypto_async_request *req = (struct crypto_async_request *)arg;

	req->complete(req, !status);
}

static inline void update_input_iv(struct cpt_request_info *req_info,
				   u8 *iv, u32 enc_iv_len,
				   u32 *argcnt)
{
	/* Setting the iv information */
	req_info->in[*argcnt].vptr = (void *)iv;
	req_info->in[*argcnt].size = enc_iv_len;
	req_info->req.dlen += enc_iv_len;

	++(*argcnt);
}

static inline void update_output_iv(struct cpt_request_info *req_info,
				    u8 *iv, u32 enc_iv_len,
				    u32 *argcnt)
{
	/* Setting the iv information */
	req_info->out[*argcnt].vptr = (void *)iv;
	req_info->out[*argcnt].size = enc_iv_len;
	req_info->rlen += enc_iv_len;

	++(*argcnt);
}

static inline void update_input_data(struct cpt_request_info *req_info,
				     struct scatterlist *inp_sg,
				     u32 nbytes, u32 *argcnt)
{
	req_info->req.dlen += nbytes;

	while (nbytes) {
		u32 len = min(nbytes, inp_sg->length);
		u8 *ptr = sg_virt(inp_sg);

		req_info->in[*argcnt].vptr = (void *)ptr;
		req_info->in[*argcnt].size = len;
		nbytes -= len;

		++(*argcnt);
		++inp_sg;
	}
}

static inline void update_output_data(struct cpt_request_info *req_info,
				      struct scatterlist *outp_sg,
				      u32 nbytes, u32 *argcnt)
{
	req_info->rlen += nbytes;

	while (nbytes) {
		u32 len = min(nbytes, outp_sg->length);
		u8 *ptr = sg_virt(outp_sg);

		req_info->out[*argcnt].vptr = (void *)ptr;
		req_info->out[*argcnt].size = len;
		nbytes -= len;
		++(*argcnt);
		++outp_sg;
	}
}

static inline u32 create_ctx_hdr(struct skcipher_request *req, u32 enc,
				 u32 *argcnt)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct cvm_enc_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
	struct fc_context *fctx = &rctx->fctx;
	u32 enc_iv_len = crypto_skcipher_ivsize(tfm);
	struct cpt_request_info *req_info = &rctx->cpt_req;
	__be64 *ctrl_flags = NULL;
	__be64 *offset_control;

	req_info->ctrl.s.grp = 0;
	req_info->ctrl.s.dma_mode = DMA_GATHER_SCATTER;
	req_info->ctrl.s.se_req = SE_CORE_REQ;

	req_info->req.opcode.s.major = MAJOR_OP_FC |
					DMA_MODE_FLAG(DMA_GATHER_SCATTER);
	if (enc)
		req_info->req.opcode.s.minor = 2;
	else
		req_info->req.opcode.s.minor = 3;

	req_info->req.param1 = req->cryptlen; /* Encryption Data length */
	req_info->req.param2 = 0; /*Auth data length */

	fctx->enc.enc_ctrl.e.enc_cipher = ctx->cipher_type;
	fctx->enc.enc_ctrl.e.aes_key = ctx->key_type;
	fctx->enc.enc_ctrl.e.iv_source = FROM_DPTR;

	if (ctx->cipher_type == AES_XTS)
		memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len * 2);
	else
		memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len);
	ctrl_flags = (__be64 *)&fctx->enc.enc_ctrl.flags;
	*ctrl_flags = cpu_to_be64(fctx->enc.enc_ctrl.flags);

	offset_control = (__be64 *)&rctx->control_word;
	*offset_control = cpu_to_be64(((u64)(enc_iv_len) << 16));
	/* Storing  Packet Data Information in offset
	 * Control Word First 8 bytes
	 */
	req_info->in[*argcnt].vptr = (u8 *)offset_control;
	req_info->in[*argcnt].size = CONTROL_WORD_LEN;
	req_info->req.dlen += CONTROL_WORD_LEN;
	++(*argcnt);

	req_info->in[*argcnt].vptr = (u8 *)fctx;
	req_info->in[*argcnt].size = sizeof(struct fc_context);
	req_info->req.dlen += sizeof(struct fc_context);

	++(*argcnt);

	return 0;
}

static inline u32 create_input_list(struct skcipher_request  *req, u32 enc,
				    u32 enc_iv_len)
{
	struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
	struct cpt_request_info *req_info = &rctx->cpt_req;
	u32 argcnt =  0;

	create_ctx_hdr(req, enc, &argcnt);
	update_input_iv(req_info, req->iv, enc_iv_len, &argcnt);
	update_input_data(req_info, req->src, req->cryptlen, &argcnt);
	req_info->incnt = argcnt;

	return 0;
}

static inline void store_cb_info(struct skcipher_request *req,
				 struct cpt_request_info *req_info)
{
	req_info->callback = (void *)cvm_callback;
	req_info->callback_arg = (void *)&req->base;
}

static inline void create_output_list(struct skcipher_request *req,
				      u32 enc_iv_len)
{
	struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
	struct cpt_request_info *req_info = &rctx->cpt_req;
	u32 argcnt = 0;

	/* OUTPUT Buffer Processing
	 * AES encryption/decryption output would be
	 * received in the following format
	 *
	 * ------IV--------|------ENCRYPTED/DECRYPTED DATA-----|
	 * [ 16 Bytes/     [   Request Enc/Dec/ DATA Len AES CBC ]
	 */
	/* Reading IV information */
	update_output_iv(req_info, req->iv, enc_iv_len, &argcnt);
	update_output_data(req_info, req->dst, req->cryptlen, &argcnt);
	req_info->outcnt = argcnt;
}

static inline int cvm_enc_dec(struct skcipher_request *req, u32 enc)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
	u32 enc_iv_len = crypto_skcipher_ivsize(tfm);
	struct fc_context *fctx = &rctx->fctx;
	struct cpt_request_info *req_info = &rctx->cpt_req;
	void *cdev = NULL;
	int status;

	memset(req_info, 0, sizeof(struct cpt_request_info));
	req_info->may_sleep = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) != 0;
	memset(fctx, 0, sizeof(struct fc_context));
	create_input_list(req, enc, enc_iv_len);
	create_output_list(req, enc_iv_len);
	store_cb_info(req, req_info);
	cdev = dev_handle.cdev[smp_processor_id()];
	status = cptvf_do_request(cdev, req_info);
	/* We perform an asynchronous send and once
	 * the request is completed the driver would
	 * intimate through  registered call back functions
	 */

	if (status)
		return status;
	else
		return -EINPROGRESS;
}

static int cvm_encrypt(struct skcipher_request *req)
{
	return cvm_enc_dec(req, true);
}

static int cvm_decrypt(struct skcipher_request *req)
{
	return cvm_enc_dec(req, false);
}

static int cvm_xts_setkey(struct crypto_skcipher *cipher, const u8 *key,
		   u32 keylen)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
	int err;
	const u8 *key1 = key;
	const u8 *key2 = key + (keylen / 2);

	err = xts_check_key(tfm, key, keylen);
	if (err)
		return err;
	ctx->key_len = keylen;
	memcpy(ctx->enc_key, key1, keylen / 2);
	memcpy(ctx->enc_key + KEY2_OFFSET, key2, keylen / 2);
	ctx->cipher_type = AES_XTS;
	switch (ctx->key_len) {
	case 32:
		ctx->key_type = AES_128_BIT;
		break;
	case 64:
		ctx->key_type = AES_256_BIT;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int cvm_validate_keylen(struct cvm_enc_ctx *ctx, u32 keylen)
{
	if ((keylen == 16) || (keylen == 24) || (keylen == 32)) {
		ctx->key_len = keylen;
		switch (ctx->key_len) {
		case 16:
			ctx->key_type = AES_128_BIT;
			break;
		case 24:
			ctx->key_type = AES_192_BIT;
			break;
		case 32:
			ctx->key_type = AES_256_BIT;
			break;
		default:
			return -EINVAL;
		}

		if (ctx->cipher_type == DES3_CBC)
			ctx->key_type = 0;

		return 0;
	}

	return -EINVAL;
}

static int cvm_setkey(struct crypto_skcipher *cipher, const u8 *key,
		      u32 keylen, u8 cipher_type)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);

	ctx->cipher_type = cipher_type;
	if (!cvm_validate_keylen(ctx, keylen)) {
		memcpy(ctx->enc_key, key, keylen);
		return 0;
	} else {
		return -EINVAL;
	}
}

static int cvm_cbc_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
			      u32 keylen)
{
	return cvm_setkey(cipher, key, keylen, AES_CBC);
}

static int cvm_ecb_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
			      u32 keylen)
{
	return cvm_setkey(cipher, key, keylen, AES_ECB);
}

static int cvm_cfb_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
			      u32 keylen)
{
	return cvm_setkey(cipher, key, keylen, AES_CFB);
}

static int cvm_cbc_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
			       u32 keylen)
{
	return verify_skcipher_des3_key(cipher, key) ?:
	       cvm_setkey(cipher, key, keylen, DES3_CBC);
}

static int cvm_ecb_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
			       u32 keylen)
{
	return verify_skcipher_des3_key(cipher, key) ?:
	       cvm_setkey(cipher, key, keylen, DES3_ECB);
}

static int cvm_enc_dec_init(struct crypto_skcipher *tfm)
{
	crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct cvm_req_ctx));

	return 0;
}

static struct skcipher_alg algs[] = { {
	.base.cra_flags		= CRYPTO_ALG_ASYNC |
				  CRYPTO_ALG_ALLOCATES_MEMORY,
	.base.cra_blocksize	= AES_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct cvm_enc_ctx),
	.base.cra_alignmask	= 7,
	.base.cra_priority	= 4001,
	.base.cra_name		= "xts(aes)",
	.base.cra_driver_name	= "cavium-xts-aes",
	.base.cra_module	= THIS_MODULE,

	.ivsize			= AES_BLOCK_SIZE,
	.min_keysize		= 2 * AES_MIN_KEY_SIZE,
	.max_keysize		= 2 * AES_MAX_KEY_SIZE,
	.setkey			= cvm_xts_setkey,
	.encrypt		= cvm_encrypt,
	.decrypt		= cvm_decrypt,
	.init			= cvm_enc_dec_init,
}, {
	.base.cra_flags		= CRYPTO_ALG_ASYNC |
				  CRYPTO_ALG_ALLOCATES_MEMORY,
	.base.cra_blocksize	= AES_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct cvm_enc_ctx),
	.base.cra_alignmask	= 7,
	.base.cra_priority	= 4001,
	.base.cra_name		= "cbc(aes)",
	.base.cra_driver_name	= "cavium-cbc-aes",
	.base.cra_module	= THIS_MODULE,

	.ivsize			= AES_BLOCK_SIZE,
	.min_keysize		= AES_MIN_KEY_SIZE,
	.max_keysize		= AES_MAX_KEY_SIZE,
	.setkey			= cvm_cbc_aes_setkey,
	.encrypt		= cvm_encrypt,
	.decrypt		= cvm_decrypt,
	.init			= cvm_enc_dec_init,
}, {
	.base.cra_flags		= CRYPTO_ALG_ASYNC |
				  CRYPTO_ALG_ALLOCATES_MEMORY,
	.base.cra_blocksize	= AES_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct cvm_enc_ctx),
	.base.cra_alignmask	= 7,
	.base.cra_priority	= 4001,
	.base.cra_name		= "ecb(aes)",
	.base.cra_driver_name	= "cavium-ecb-aes",
	.base.cra_module	= THIS_MODULE,

	.min_keysize		= AES_MIN_KEY_SIZE,
	.max_keysize		= AES_MAX_KEY_SIZE,
	.setkey			= cvm_ecb_aes_setkey,
	.encrypt		= cvm_encrypt,
	.decrypt		= cvm_decrypt,
	.init			= cvm_enc_dec_init,
}, {
	.base.cra_flags		= CRYPTO_ALG_ASYNC |
				  CRYPTO_ALG_ALLOCATES_MEMORY,
	.base.cra_blocksize	= AES_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct cvm_enc_ctx),
	.base.cra_alignmask	= 7,
	.base.cra_priority	= 4001,
	.base.cra_name		= "cfb(aes)",
	.base.cra_driver_name	= "cavium-cfb-aes",
	.base.cra_module	= THIS_MODULE,

	.ivsize			= AES_BLOCK_SIZE,
	.min_keysize		= AES_MIN_KEY_SIZE,
	.max_keysize		= AES_MAX_KEY_SIZE,
	.setkey			= cvm_cfb_aes_setkey,
	.encrypt		= cvm_encrypt,
	.decrypt		= cvm_decrypt,
	.init			= cvm_enc_dec_init,
}, {
	.base.cra_flags		= CRYPTO_ALG_ASYNC |
				  CRYPTO_ALG_ALLOCATES_MEMORY,
	.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct cvm_des3_ctx),
	.base.cra_alignmask	= 7,
	.base.cra_priority	= 4001,
	.base.cra_name		= "cbc(des3_ede)",
	.base.cra_driver_name	= "cavium-cbc-des3_ede",
	.base.cra_module	= THIS_MODULE,

	.min_keysize		= DES3_EDE_KEY_SIZE,
	.max_keysize		= DES3_EDE_KEY_SIZE,
	.ivsize			= DES_BLOCK_SIZE,
	.setkey			= cvm_cbc_des3_setkey,
	.encrypt		= cvm_encrypt,
	.decrypt		= cvm_decrypt,
	.init			= cvm_enc_dec_init,
}, {
	.base.cra_flags		= CRYPTO_ALG_ASYNC |
				  CRYPTO_ALG_ALLOCATES_MEMORY,
	.base.cra_blocksize	= DES3_EDE_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct cvm_des3_ctx),
	.base.cra_alignmask	= 7,
	.base.cra_priority	= 4001,
	.base.cra_name		= "ecb(des3_ede)",
	.base.cra_driver_name	= "cavium-ecb-des3_ede",
	.base.cra_module	= THIS_MODULE,

	.min_keysize		= DES3_EDE_KEY_SIZE,
	.max_keysize		= DES3_EDE_KEY_SIZE,
	.ivsize			= DES_BLOCK_SIZE,
	.setkey			= cvm_ecb_des3_setkey,
	.encrypt		= cvm_encrypt,
	.decrypt		= cvm_decrypt,
	.init			= cvm_enc_dec_init,
} };

static inline int cav_register_algs(void)
{
	return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
}

static inline void cav_unregister_algs(void)
{
	crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
}

int cvm_crypto_init(struct cpt_vf *cptvf)
{
	struct pci_dev *pdev = cptvf->pdev;
	u32 dev_count;

	dev_count = dev_handle.dev_count;
	dev_handle.cdev[dev_count] = cptvf;
	dev_handle.dev_count++;

	if (dev_count == 3) {
		if (cav_register_algs()) {
			dev_err(&pdev->dev, "Error in registering crypto algorithms\n");
			return -EINVAL;
		}
	}

	return 0;
}

void cvm_crypto_exit(void)
{
	u32 dev_count;

	dev_count = --dev_handle.dev_count;
	if (!dev_count)
		cav_unregister_algs();
}