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Merge tag 'arc-4.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[mirror_ubuntu-artful-kernel.git] / crypto / pcrypt.c
CommitLineData
5068c7a8
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1/*
2 * pcrypt - Parallel crypto wrapper.
3 *
4 * Copyright (C) 2009 secunet Security Networks AG
5 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 */
20
21#include <crypto/algapi.h>
22#include <crypto/internal/aead.h>
a5a22e57 23#include <linux/atomic.h>
5068c7a8
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24#include <linux/err.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <linux/slab.h>
e15bacbe 28#include <linux/notifier.h>
a3fb1e33 29#include <linux/kobject.h>
d3f64e46 30#include <linux/cpu.h>
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31#include <crypto/pcrypt.h>
32
c57e842e 33struct padata_pcrypt {
e15bacbe
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34 struct padata_instance *pinst;
35 struct workqueue_struct *wq;
36
37 /*
38 * Cpumask for callback CPUs. It should be
39 * equal to serial cpumask of corresponding padata instance,
40 * so it is updated when padata notifies us about serial
41 * cpumask change.
42 *
43 * cb_cpumask is protected by RCU. This fact prevents us from
44 * using cpumask_var_t directly because the actual type of
45 * cpumsak_var_t depends on kernel configuration(particularly on
46 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
47 * cpumask_var_t may be either a pointer to the struct cpumask
48 * or a variable allocated on the stack. Thus we can not safely use
49 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
50 * rcu_dereference. So cpumask_var_t is wrapped with struct
51 * pcrypt_cpumask which makes possible to use it with RCU.
52 */
53 struct pcrypt_cpumask {
54 cpumask_var_t mask;
55 } *cb_cpumask;
56 struct notifier_block nblock;
57};
58
c57e842e
SK
59static struct padata_pcrypt pencrypt;
60static struct padata_pcrypt pdecrypt;
a3fb1e33 61static struct kset *pcrypt_kset;
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62
63struct pcrypt_instance_ctx {
66d948e7 64 struct crypto_aead_spawn spawn;
a5a22e57 65 atomic_t tfm_count;
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66};
67
68struct pcrypt_aead_ctx {
69 struct crypto_aead *child;
70 unsigned int cb_cpu;
71};
72
73static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
c57e842e 74 struct padata_pcrypt *pcrypt)
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75{
76 unsigned int cpu_index, cpu, i;
e15bacbe 77 struct pcrypt_cpumask *cpumask;
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78
79 cpu = *cb_cpu;
80
e15bacbe 81 rcu_read_lock_bh();
3110e400 82 cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
e15bacbe 83 if (cpumask_test_cpu(cpu, cpumask->mask))
5068c7a8
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84 goto out;
85
cc74f4bc
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86 if (!cpumask_weight(cpumask->mask))
87 goto out;
88
e15bacbe 89 cpu_index = cpu % cpumask_weight(cpumask->mask);
5068c7a8 90
e15bacbe 91 cpu = cpumask_first(cpumask->mask);
5068c7a8 92 for (i = 0; i < cpu_index; i++)
e15bacbe 93 cpu = cpumask_next(cpu, cpumask->mask);
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94
95 *cb_cpu = cpu;
96
97out:
e15bacbe
DK
98 rcu_read_unlock_bh();
99 return padata_do_parallel(pcrypt->pinst, padata, cpu);
5068c7a8
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100}
101
102static int pcrypt_aead_setkey(struct crypto_aead *parent,
103 const u8 *key, unsigned int keylen)
104{
105 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
106
107 return crypto_aead_setkey(ctx->child, key, keylen);
108}
109
110static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
111 unsigned int authsize)
112{
113 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
114
115 return crypto_aead_setauthsize(ctx->child, authsize);
116}
117
118static void pcrypt_aead_serial(struct padata_priv *padata)
119{
120 struct pcrypt_request *preq = pcrypt_padata_request(padata);
121 struct aead_request *req = pcrypt_request_ctx(preq);
122
123 aead_request_complete(req->base.data, padata->info);
124}
125
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126static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
127{
128 struct aead_request *req = areq->data;
129 struct pcrypt_request *preq = aead_request_ctx(req);
130 struct padata_priv *padata = pcrypt_request_padata(preq);
131
132 padata->info = err;
133 req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
134
135 padata_do_serial(padata);
136}
137
138static void pcrypt_aead_enc(struct padata_priv *padata)
139{
140 struct pcrypt_request *preq = pcrypt_padata_request(padata);
141 struct aead_request *req = pcrypt_request_ctx(preq);
142
143 padata->info = crypto_aead_encrypt(req);
144
5a1436be 145 if (padata->info == -EINPROGRESS)
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146 return;
147
148 padata_do_serial(padata);
149}
150
151static int pcrypt_aead_encrypt(struct aead_request *req)
152{
153 int err;
154 struct pcrypt_request *preq = aead_request_ctx(req);
155 struct aead_request *creq = pcrypt_request_ctx(preq);
156 struct padata_priv *padata = pcrypt_request_padata(preq);
157 struct crypto_aead *aead = crypto_aead_reqtfm(req);
158 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
159 u32 flags = aead_request_flags(req);
160
161 memset(padata, 0, sizeof(struct padata_priv));
162
163 padata->parallel = pcrypt_aead_enc;
164 padata->serial = pcrypt_aead_serial;
165
166 aead_request_set_tfm(creq, ctx->child);
167 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
168 pcrypt_aead_done, req);
169 aead_request_set_crypt(creq, req->src, req->dst,
170 req->cryptlen, req->iv);
0496f560 171 aead_request_set_ad(creq, req->assoclen);
5068c7a8 172
e15bacbe 173 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
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174 if (!err)
175 return -EINPROGRESS;
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176
177 return err;
178}
179
180static void pcrypt_aead_dec(struct padata_priv *padata)
181{
182 struct pcrypt_request *preq = pcrypt_padata_request(padata);
183 struct aead_request *req = pcrypt_request_ctx(preq);
184
185 padata->info = crypto_aead_decrypt(req);
186
5a1436be 187 if (padata->info == -EINPROGRESS)
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188 return;
189
190 padata_do_serial(padata);
191}
192
193static int pcrypt_aead_decrypt(struct aead_request *req)
194{
195 int err;
196 struct pcrypt_request *preq = aead_request_ctx(req);
197 struct aead_request *creq = pcrypt_request_ctx(preq);
198 struct padata_priv *padata = pcrypt_request_padata(preq);
199 struct crypto_aead *aead = crypto_aead_reqtfm(req);
200 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
201 u32 flags = aead_request_flags(req);
202
203 memset(padata, 0, sizeof(struct padata_priv));
204
205 padata->parallel = pcrypt_aead_dec;
206 padata->serial = pcrypt_aead_serial;
207
208 aead_request_set_tfm(creq, ctx->child);
209 aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
210 pcrypt_aead_done, req);
211 aead_request_set_crypt(creq, req->src, req->dst,
212 req->cryptlen, req->iv);
0496f560 213 aead_request_set_ad(creq, req->assoclen);
5068c7a8 214
e15bacbe 215 err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
83f619f3
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216 if (!err)
217 return -EINPROGRESS;
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218
219 return err;
220}
221
0496f560 222static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
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223{
224 int cpu, cpu_index;
0496f560
HX
225 struct aead_instance *inst = aead_alg_instance(tfm);
226 struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
227 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
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228 struct crypto_aead *cipher;
229
a5a22e57
HX
230 cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
231 cpumask_weight(cpu_online_mask);
5068c7a8 232
fbf0ca1b 233 ctx->cb_cpu = cpumask_first(cpu_online_mask);
5068c7a8 234 for (cpu = 0; cpu < cpu_index; cpu++)
fbf0ca1b 235 ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);
5068c7a8 236
0496f560 237 cipher = crypto_spawn_aead(&ictx->spawn);
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238
239 if (IS_ERR(cipher))
240 return PTR_ERR(cipher);
241
242 ctx->child = cipher;
0496f560
HX
243 crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
244 sizeof(struct aead_request) +
245 crypto_aead_reqsize(cipher));
5068c7a8
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246
247 return 0;
248}
249
0496f560 250static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
5068c7a8 251{
0496f560 252 struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
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253
254 crypto_free_aead(ctx->child);
255}
256
66d948e7
HX
257static int pcrypt_init_instance(struct crypto_instance *inst,
258 struct crypto_alg *alg)
5068c7a8 259{
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SK
260 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
261 "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
66d948e7 262 return -ENAMETOOLONG;
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263
264 memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
265
5068c7a8
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266 inst->alg.cra_priority = alg->cra_priority + 100;
267 inst->alg.cra_blocksize = alg->cra_blocksize;
268 inst->alg.cra_alignmask = alg->cra_alignmask;
269
66d948e7 270 return 0;
5068c7a8
SK
271}
272
0496f560
HX
273static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
274 u32 type, u32 mask)
5068c7a8 275{
66d948e7 276 struct pcrypt_instance_ctx *ctx;
846f97df 277 struct crypto_attr_type *algt;
0496f560
HX
278 struct aead_instance *inst;
279 struct aead_alg *alg;
66d948e7
HX
280 const char *name;
281 int err;
282
846f97df
HX
283 algt = crypto_get_attr_type(tb);
284 if (IS_ERR(algt))
285 return PTR_ERR(algt);
286
66d948e7
HX
287 name = crypto_attr_alg_name(tb[1]);
288 if (IS_ERR(name))
0496f560 289 return PTR_ERR(name);
66d948e7
HX
290
291 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
292 if (!inst)
0496f560 293 return -ENOMEM;
66d948e7 294
0496f560
HX
295 ctx = aead_instance_ctx(inst);
296 crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
5068c7a8 297
5e4b8c1f 298 err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
66d948e7
HX
299 if (err)
300 goto out_free_inst;
5068c7a8 301
0496f560
HX
302 alg = crypto_spawn_aead_alg(&ctx->spawn);
303 err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
66d948e7
HX
304 if (err)
305 goto out_drop_aead;
5068c7a8 306
846f97df 307 inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;
846f97df 308
0496f560
HX
309 inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
310 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
5068c7a8 311
0496f560 312 inst->alg.base.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
5068c7a8 313
0496f560
HX
314 inst->alg.init = pcrypt_aead_init_tfm;
315 inst->alg.exit = pcrypt_aead_exit_tfm;
5068c7a8 316
0496f560
HX
317 inst->alg.setkey = pcrypt_aead_setkey;
318 inst->alg.setauthsize = pcrypt_aead_setauthsize;
319 inst->alg.encrypt = pcrypt_aead_encrypt;
320 inst->alg.decrypt = pcrypt_aead_decrypt;
5068c7a8 321
0496f560
HX
322 err = aead_register_instance(tmpl, inst);
323 if (err)
324 goto out_drop_aead;
5068c7a8 325
66d948e7 326out:
0496f560 327 return err;
66d948e7
HX
328
329out_drop_aead:
330 crypto_drop_aead(&ctx->spawn);
331out_free_inst:
332 kfree(inst);
66d948e7 333 goto out;
5068c7a8
SK
334}
335
0496f560 336static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
5068c7a8
SK
337{
338 struct crypto_attr_type *algt;
339
340 algt = crypto_get_attr_type(tb);
341 if (IS_ERR(algt))
0496f560 342 return PTR_ERR(algt);
5068c7a8
SK
343
344 switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
345 case CRYPTO_ALG_TYPE_AEAD:
0496f560 346 return pcrypt_create_aead(tmpl, tb, algt->type, algt->mask);
5068c7a8
SK
347 }
348
0496f560 349 return -EINVAL;
5068c7a8
SK
350}
351
352static void pcrypt_free(struct crypto_instance *inst)
353{
354 struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
355
66d948e7 356 crypto_drop_aead(&ctx->spawn);
5068c7a8
SK
357 kfree(inst);
358}
359
e15bacbe
DK
360static int pcrypt_cpumask_change_notify(struct notifier_block *self,
361 unsigned long val, void *data)
362{
c57e842e 363 struct padata_pcrypt *pcrypt;
e15bacbe 364 struct pcrypt_cpumask *new_mask, *old_mask;
d3f64e46 365 struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
e15bacbe
DK
366
367 if (!(val & PADATA_CPU_SERIAL))
368 return 0;
369
c57e842e 370 pcrypt = container_of(self, struct padata_pcrypt, nblock);
e15bacbe
DK
371 new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
372 if (!new_mask)
373 return -ENOMEM;
374 if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
375 kfree(new_mask);
376 return -ENOMEM;
377 }
378
379 old_mask = pcrypt->cb_cpumask;
380
d3f64e46 381 cpumask_copy(new_mask->mask, cpumask->cbcpu);
e15bacbe
DK
382 rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
383 synchronize_rcu_bh();
384
385 free_cpumask_var(old_mask->mask);
386 kfree(old_mask);
387 return 0;
388}
389
a3fb1e33
DK
390static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
391{
392 int ret;
393
394 pinst->kobj.kset = pcrypt_kset;
395 ret = kobject_add(&pinst->kobj, NULL, name);
396 if (!ret)
397 kobject_uevent(&pinst->kobj, KOBJ_ADD);
398
399 return ret;
400}
401
c57e842e
SK
402static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
403 const char *name)
e15bacbe
DK
404{
405 int ret = -ENOMEM;
406 struct pcrypt_cpumask *mask;
407
d3f64e46
SK
408 get_online_cpus();
409
d8537548
KC
410 pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
411 1, name);
e15bacbe
DK
412 if (!pcrypt->wq)
413 goto err;
414
e6cc1170 415 pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
e15bacbe
DK
416 if (!pcrypt->pinst)
417 goto err_destroy_workqueue;
418
419 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
420 if (!mask)
421 goto err_free_padata;
422 if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
423 kfree(mask);
424 goto err_free_padata;
425 }
426
fbf0ca1b 427 cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
e15bacbe
DK
428 rcu_assign_pointer(pcrypt->cb_cpumask, mask);
429
430 pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
431 ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
432 if (ret)
433 goto err_free_cpumask;
434
a3fb1e33
DK
435 ret = pcrypt_sysfs_add(pcrypt->pinst, name);
436 if (ret)
437 goto err_unregister_notifier;
438
d3f64e46
SK
439 put_online_cpus();
440
e15bacbe 441 return ret;
d3f64e46 442
a3fb1e33
DK
443err_unregister_notifier:
444 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
e15bacbe
DK
445err_free_cpumask:
446 free_cpumask_var(mask->mask);
447 kfree(mask);
448err_free_padata:
449 padata_free(pcrypt->pinst);
450err_destroy_workqueue:
451 destroy_workqueue(pcrypt->wq);
452err:
d3f64e46
SK
453 put_online_cpus();
454
e15bacbe
DK
455 return ret;
456}
457
c57e842e 458static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
e15bacbe
DK
459{
460 free_cpumask_var(pcrypt->cb_cpumask->mask);
461 kfree(pcrypt->cb_cpumask);
462
463 padata_stop(pcrypt->pinst);
464 padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
465 destroy_workqueue(pcrypt->wq);
466 padata_free(pcrypt->pinst);
467}
468
5068c7a8
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469static struct crypto_template pcrypt_tmpl = {
470 .name = "pcrypt",
0496f560 471 .create = pcrypt_create,
5068c7a8
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472 .free = pcrypt_free,
473 .module = THIS_MODULE,
474};
475
476static int __init pcrypt_init(void)
477{
a3fb1e33
DK
478 int err = -ENOMEM;
479
480 pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
481 if (!pcrypt_kset)
482 goto err;
5068c7a8 483
c57e842e 484 err = pcrypt_init_padata(&pencrypt, "pencrypt");
4c879170 485 if (err)
a3fb1e33 486 goto err_unreg_kset;
4c879170 487
c57e842e 488 err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
4c879170 489 if (err)
e15bacbe 490 goto err_deinit_pencrypt;
4c879170 491
e15bacbe
DK
492 padata_start(pencrypt.pinst);
493 padata_start(pdecrypt.pinst);
5068c7a8 494
e15bacbe 495 return crypto_register_template(&pcrypt_tmpl);
5068c7a8 496
e15bacbe 497err_deinit_pencrypt:
c57e842e 498 pcrypt_fini_padata(&pencrypt);
a3fb1e33
DK
499err_unreg_kset:
500 kset_unregister(pcrypt_kset);
5068c7a8 501err:
4c879170 502 return err;
5068c7a8
SK
503}
504
505static void __exit pcrypt_exit(void)
506{
c57e842e
SK
507 pcrypt_fini_padata(&pencrypt);
508 pcrypt_fini_padata(&pdecrypt);
5068c7a8 509
a3fb1e33 510 kset_unregister(pcrypt_kset);
5068c7a8
SK
511 crypto_unregister_template(&pcrypt_tmpl);
512}
513
514module_init(pcrypt_init);
515module_exit(pcrypt_exit);
516
517MODULE_LICENSE("GPL");
518MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
519MODULE_DESCRIPTION("Parallel crypto wrapper");
4943ba16 520MODULE_ALIAS_CRYPTO("pcrypt");