Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 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> |
| 23 | #include <linux/err.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/slab.h> |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 27 | #include <linux/notifier.h> |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 28 | #include <linux/kobject.h> |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 29 | #include <crypto/pcrypt.h> |
| 30 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 31 | struct pcrypt_instance { |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 32 | const char *name; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 33 | struct padata_instance *pinst; |
| 34 | struct workqueue_struct *wq; |
| 35 | |
| 36 | /* |
| 37 | * Cpumask for callback CPUs. It should be |
| 38 | * equal to serial cpumask of corresponding padata instance, |
| 39 | * so it is updated when padata notifies us about serial |
| 40 | * cpumask change. |
| 41 | * |
| 42 | * cb_cpumask is protected by RCU. This fact prevents us from |
| 43 | * using cpumask_var_t directly because the actual type of |
| 44 | * cpumsak_var_t depends on kernel configuration(particularly on |
| 45 | * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration |
| 46 | * cpumask_var_t may be either a pointer to the struct cpumask |
| 47 | * or a variable allocated on the stack. Thus we can not safely use |
| 48 | * cpumask_var_t with RCU operations such as rcu_assign_pointer or |
| 49 | * rcu_dereference. So cpumask_var_t is wrapped with struct |
| 50 | * pcrypt_cpumask which makes possible to use it with RCU. |
| 51 | */ |
| 52 | struct pcrypt_cpumask { |
| 53 | cpumask_var_t mask; |
| 54 | } *cb_cpumask; |
| 55 | struct notifier_block nblock; |
| 56 | }; |
| 57 | |
| 58 | static struct pcrypt_instance pencrypt; |
| 59 | static struct pcrypt_instance pdecrypt; |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 60 | static struct kset *pcrypt_kset; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 61 | |
| 62 | struct pcrypt_instance_ctx { |
| 63 | struct crypto_spawn spawn; |
| 64 | unsigned int tfm_count; |
| 65 | }; |
| 66 | |
| 67 | struct pcrypt_aead_ctx { |
| 68 | struct crypto_aead *child; |
| 69 | unsigned int cb_cpu; |
| 70 | }; |
| 71 | |
| 72 | static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu, |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 73 | struct pcrypt_instance *pcrypt) |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 74 | { |
| 75 | unsigned int cpu_index, cpu, i; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 76 | struct pcrypt_cpumask *cpumask; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 77 | |
| 78 | cpu = *cb_cpu; |
| 79 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 80 | rcu_read_lock_bh(); |
| 81 | cpumask = rcu_dereference(pcrypt->cb_cpumask); |
| 82 | if (cpumask_test_cpu(cpu, cpumask->mask)) |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 83 | goto out; |
| 84 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 85 | cpu_index = cpu % cpumask_weight(cpumask->mask); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 86 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 87 | cpu = cpumask_first(cpumask->mask); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 88 | for (i = 0; i < cpu_index; i++) |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 89 | cpu = cpumask_next(cpu, cpumask->mask); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 90 | |
| 91 | *cb_cpu = cpu; |
| 92 | |
| 93 | out: |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 94 | rcu_read_unlock_bh(); |
| 95 | return padata_do_parallel(pcrypt->pinst, padata, cpu); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | static int pcrypt_aead_setkey(struct crypto_aead *parent, |
| 99 | const u8 *key, unsigned int keylen) |
| 100 | { |
| 101 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); |
| 102 | |
| 103 | return crypto_aead_setkey(ctx->child, key, keylen); |
| 104 | } |
| 105 | |
| 106 | static int pcrypt_aead_setauthsize(struct crypto_aead *parent, |
| 107 | unsigned int authsize) |
| 108 | { |
| 109 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent); |
| 110 | |
| 111 | return crypto_aead_setauthsize(ctx->child, authsize); |
| 112 | } |
| 113 | |
| 114 | static void pcrypt_aead_serial(struct padata_priv *padata) |
| 115 | { |
| 116 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 117 | struct aead_request *req = pcrypt_request_ctx(preq); |
| 118 | |
| 119 | aead_request_complete(req->base.data, padata->info); |
| 120 | } |
| 121 | |
| 122 | static void pcrypt_aead_giv_serial(struct padata_priv *padata) |
| 123 | { |
| 124 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 125 | struct aead_givcrypt_request *req = pcrypt_request_ctx(preq); |
| 126 | |
| 127 | aead_request_complete(req->areq.base.data, padata->info); |
| 128 | } |
| 129 | |
| 130 | static void pcrypt_aead_done(struct crypto_async_request *areq, int err) |
| 131 | { |
| 132 | struct aead_request *req = areq->data; |
| 133 | struct pcrypt_request *preq = aead_request_ctx(req); |
| 134 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 135 | |
| 136 | padata->info = err; |
| 137 | req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
| 138 | |
| 139 | padata_do_serial(padata); |
| 140 | } |
| 141 | |
| 142 | static void pcrypt_aead_enc(struct padata_priv *padata) |
| 143 | { |
| 144 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 145 | struct aead_request *req = pcrypt_request_ctx(preq); |
| 146 | |
| 147 | padata->info = crypto_aead_encrypt(req); |
| 148 | |
Steffen Klassert | 5a1436b | 2010-02-04 11:40:17 +1100 | [diff] [blame] | 149 | if (padata->info == -EINPROGRESS) |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 150 | return; |
| 151 | |
| 152 | padata_do_serial(padata); |
| 153 | } |
| 154 | |
| 155 | static int pcrypt_aead_encrypt(struct aead_request *req) |
| 156 | { |
| 157 | int err; |
| 158 | struct pcrypt_request *preq = aead_request_ctx(req); |
| 159 | struct aead_request *creq = pcrypt_request_ctx(preq); |
| 160 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 161 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 162 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); |
| 163 | u32 flags = aead_request_flags(req); |
| 164 | |
| 165 | memset(padata, 0, sizeof(struct padata_priv)); |
| 166 | |
| 167 | padata->parallel = pcrypt_aead_enc; |
| 168 | padata->serial = pcrypt_aead_serial; |
| 169 | |
| 170 | aead_request_set_tfm(creq, ctx->child); |
| 171 | aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
| 172 | pcrypt_aead_done, req); |
| 173 | aead_request_set_crypt(creq, req->src, req->dst, |
| 174 | req->cryptlen, req->iv); |
| 175 | aead_request_set_assoc(creq, req->assoc, req->assoclen); |
| 176 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 177 | err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt); |
Steffen Klassert | 83f619f | 2010-07-07 15:32:02 +0200 | [diff] [blame] | 178 | if (!err) |
| 179 | return -EINPROGRESS; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 180 | |
| 181 | return err; |
| 182 | } |
| 183 | |
| 184 | static void pcrypt_aead_dec(struct padata_priv *padata) |
| 185 | { |
| 186 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 187 | struct aead_request *req = pcrypt_request_ctx(preq); |
| 188 | |
| 189 | padata->info = crypto_aead_decrypt(req); |
| 190 | |
Steffen Klassert | 5a1436b | 2010-02-04 11:40:17 +1100 | [diff] [blame] | 191 | if (padata->info == -EINPROGRESS) |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 192 | return; |
| 193 | |
| 194 | padata_do_serial(padata); |
| 195 | } |
| 196 | |
| 197 | static int pcrypt_aead_decrypt(struct aead_request *req) |
| 198 | { |
| 199 | int err; |
| 200 | struct pcrypt_request *preq = aead_request_ctx(req); |
| 201 | struct aead_request *creq = pcrypt_request_ctx(preq); |
| 202 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 203 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 204 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); |
| 205 | u32 flags = aead_request_flags(req); |
| 206 | |
| 207 | memset(padata, 0, sizeof(struct padata_priv)); |
| 208 | |
| 209 | padata->parallel = pcrypt_aead_dec; |
| 210 | padata->serial = pcrypt_aead_serial; |
| 211 | |
| 212 | aead_request_set_tfm(creq, ctx->child); |
| 213 | aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
| 214 | pcrypt_aead_done, req); |
| 215 | aead_request_set_crypt(creq, req->src, req->dst, |
| 216 | req->cryptlen, req->iv); |
| 217 | aead_request_set_assoc(creq, req->assoc, req->assoclen); |
| 218 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 219 | err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt); |
Steffen Klassert | 83f619f | 2010-07-07 15:32:02 +0200 | [diff] [blame] | 220 | if (!err) |
| 221 | return -EINPROGRESS; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 222 | |
| 223 | return err; |
| 224 | } |
| 225 | |
| 226 | static void pcrypt_aead_givenc(struct padata_priv *padata) |
| 227 | { |
| 228 | struct pcrypt_request *preq = pcrypt_padata_request(padata); |
| 229 | struct aead_givcrypt_request *req = pcrypt_request_ctx(preq); |
| 230 | |
| 231 | padata->info = crypto_aead_givencrypt(req); |
| 232 | |
Steffen Klassert | 5a1436b | 2010-02-04 11:40:17 +1100 | [diff] [blame] | 233 | if (padata->info == -EINPROGRESS) |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 234 | return; |
| 235 | |
| 236 | padata_do_serial(padata); |
| 237 | } |
| 238 | |
| 239 | static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req) |
| 240 | { |
| 241 | int err; |
| 242 | struct aead_request *areq = &req->areq; |
| 243 | struct pcrypt_request *preq = aead_request_ctx(areq); |
| 244 | struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq); |
| 245 | struct padata_priv *padata = pcrypt_request_padata(preq); |
| 246 | struct crypto_aead *aead = aead_givcrypt_reqtfm(req); |
| 247 | struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead); |
| 248 | u32 flags = aead_request_flags(areq); |
| 249 | |
| 250 | memset(padata, 0, sizeof(struct padata_priv)); |
| 251 | |
| 252 | padata->parallel = pcrypt_aead_givenc; |
| 253 | padata->serial = pcrypt_aead_giv_serial; |
| 254 | |
| 255 | aead_givcrypt_set_tfm(creq, ctx->child); |
| 256 | aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP, |
| 257 | pcrypt_aead_done, areq); |
| 258 | aead_givcrypt_set_crypt(creq, areq->src, areq->dst, |
| 259 | areq->cryptlen, areq->iv); |
| 260 | aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen); |
| 261 | aead_givcrypt_set_giv(creq, req->giv, req->seq); |
| 262 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 263 | err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt); |
Steffen Klassert | 83f619f | 2010-07-07 15:32:02 +0200 | [diff] [blame] | 264 | if (!err) |
| 265 | return -EINPROGRESS; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 266 | |
| 267 | return err; |
| 268 | } |
| 269 | |
| 270 | static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm) |
| 271 | { |
| 272 | int cpu, cpu_index; |
| 273 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
| 274 | struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst); |
| 275 | struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm); |
| 276 | struct crypto_aead *cipher; |
| 277 | |
| 278 | ictx->tfm_count++; |
| 279 | |
| 280 | cpu_index = ictx->tfm_count % cpumask_weight(cpu_active_mask); |
| 281 | |
| 282 | ctx->cb_cpu = cpumask_first(cpu_active_mask); |
| 283 | for (cpu = 0; cpu < cpu_index; cpu++) |
| 284 | ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_active_mask); |
| 285 | |
| 286 | cipher = crypto_spawn_aead(crypto_instance_ctx(inst)); |
| 287 | |
| 288 | if (IS_ERR(cipher)) |
| 289 | return PTR_ERR(cipher); |
| 290 | |
| 291 | ctx->child = cipher; |
| 292 | tfm->crt_aead.reqsize = sizeof(struct pcrypt_request) |
| 293 | + sizeof(struct aead_givcrypt_request) |
| 294 | + crypto_aead_reqsize(cipher); |
| 295 | |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm) |
| 300 | { |
| 301 | struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm); |
| 302 | |
| 303 | crypto_free_aead(ctx->child); |
| 304 | } |
| 305 | |
| 306 | static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg) |
| 307 | { |
| 308 | struct crypto_instance *inst; |
| 309 | struct pcrypt_instance_ctx *ctx; |
| 310 | int err; |
| 311 | |
| 312 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 313 | if (!inst) { |
| 314 | inst = ERR_PTR(-ENOMEM); |
| 315 | goto out; |
| 316 | } |
| 317 | |
| 318 | err = -ENAMETOOLONG; |
| 319 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 320 | "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| 321 | goto out_free_inst; |
| 322 | |
| 323 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); |
| 324 | |
| 325 | ctx = crypto_instance_ctx(inst); |
| 326 | err = crypto_init_spawn(&ctx->spawn, alg, inst, |
| 327 | CRYPTO_ALG_TYPE_MASK); |
| 328 | if (err) |
| 329 | goto out_free_inst; |
| 330 | |
| 331 | inst->alg.cra_priority = alg->cra_priority + 100; |
| 332 | inst->alg.cra_blocksize = alg->cra_blocksize; |
| 333 | inst->alg.cra_alignmask = alg->cra_alignmask; |
| 334 | |
| 335 | out: |
| 336 | return inst; |
| 337 | |
| 338 | out_free_inst: |
| 339 | kfree(inst); |
| 340 | inst = ERR_PTR(err); |
| 341 | goto out; |
| 342 | } |
| 343 | |
Dan Carpenter | 80a6d7d | 2010-03-24 21:35:23 +0800 | [diff] [blame] | 344 | static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb, |
| 345 | u32 type, u32 mask) |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 346 | { |
| 347 | struct crypto_instance *inst; |
| 348 | struct crypto_alg *alg; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 349 | |
Dan Carpenter | 80a6d7d | 2010-03-24 21:35:23 +0800 | [diff] [blame] | 350 | alg = crypto_get_attr_alg(tb, type, (mask & CRYPTO_ALG_TYPE_MASK)); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 351 | if (IS_ERR(alg)) |
| 352 | return ERR_CAST(alg); |
| 353 | |
| 354 | inst = pcrypt_alloc_instance(alg); |
| 355 | if (IS_ERR(inst)) |
| 356 | goto out_put_alg; |
| 357 | |
| 358 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC; |
| 359 | inst->alg.cra_type = &crypto_aead_type; |
| 360 | |
| 361 | inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize; |
| 362 | inst->alg.cra_aead.geniv = alg->cra_aead.geniv; |
| 363 | inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize; |
| 364 | |
| 365 | inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx); |
| 366 | |
| 367 | inst->alg.cra_init = pcrypt_aead_init_tfm; |
| 368 | inst->alg.cra_exit = pcrypt_aead_exit_tfm; |
| 369 | |
| 370 | inst->alg.cra_aead.setkey = pcrypt_aead_setkey; |
| 371 | inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize; |
| 372 | inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt; |
| 373 | inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt; |
| 374 | inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt; |
| 375 | |
| 376 | out_put_alg: |
| 377 | crypto_mod_put(alg); |
| 378 | return inst; |
| 379 | } |
| 380 | |
| 381 | static struct crypto_instance *pcrypt_alloc(struct rtattr **tb) |
| 382 | { |
| 383 | struct crypto_attr_type *algt; |
| 384 | |
| 385 | algt = crypto_get_attr_type(tb); |
| 386 | if (IS_ERR(algt)) |
| 387 | return ERR_CAST(algt); |
| 388 | |
| 389 | switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) { |
| 390 | case CRYPTO_ALG_TYPE_AEAD: |
Dan Carpenter | 80a6d7d | 2010-03-24 21:35:23 +0800 | [diff] [blame] | 391 | return pcrypt_alloc_aead(tb, algt->type, algt->mask); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | return ERR_PTR(-EINVAL); |
| 395 | } |
| 396 | |
| 397 | static void pcrypt_free(struct crypto_instance *inst) |
| 398 | { |
| 399 | struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst); |
| 400 | |
| 401 | crypto_drop_spawn(&ctx->spawn); |
| 402 | kfree(inst); |
| 403 | } |
| 404 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 405 | static int pcrypt_cpumask_change_notify(struct notifier_block *self, |
| 406 | unsigned long val, void *data) |
| 407 | { |
| 408 | struct pcrypt_instance *pcrypt; |
| 409 | struct pcrypt_cpumask *new_mask, *old_mask; |
| 410 | |
| 411 | if (!(val & PADATA_CPU_SERIAL)) |
| 412 | return 0; |
| 413 | |
| 414 | pcrypt = container_of(self, struct pcrypt_instance, nblock); |
| 415 | new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL); |
| 416 | if (!new_mask) |
| 417 | return -ENOMEM; |
| 418 | if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) { |
| 419 | kfree(new_mask); |
| 420 | return -ENOMEM; |
| 421 | } |
| 422 | |
| 423 | old_mask = pcrypt->cb_cpumask; |
| 424 | |
| 425 | padata_get_cpumask(pcrypt->pinst, PADATA_CPU_SERIAL, new_mask->mask); |
| 426 | rcu_assign_pointer(pcrypt->cb_cpumask, new_mask); |
| 427 | synchronize_rcu_bh(); |
| 428 | |
| 429 | free_cpumask_var(old_mask->mask); |
| 430 | kfree(old_mask); |
| 431 | return 0; |
| 432 | } |
| 433 | |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 434 | static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name) |
| 435 | { |
| 436 | int ret; |
| 437 | |
| 438 | pinst->kobj.kset = pcrypt_kset; |
| 439 | ret = kobject_add(&pinst->kobj, NULL, name); |
| 440 | if (!ret) |
| 441 | kobject_uevent(&pinst->kobj, KOBJ_ADD); |
| 442 | |
| 443 | return ret; |
| 444 | } |
| 445 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 446 | static int __pcrypt_init_instance(struct pcrypt_instance *pcrypt, |
| 447 | const char *name) |
| 448 | { |
| 449 | int ret = -ENOMEM; |
| 450 | struct pcrypt_cpumask *mask; |
| 451 | |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 452 | pcrypt->name = name; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 453 | pcrypt->wq = create_workqueue(name); |
| 454 | if (!pcrypt->wq) |
| 455 | goto err; |
| 456 | |
| 457 | pcrypt->pinst = padata_alloc(pcrypt->wq); |
| 458 | if (!pcrypt->pinst) |
| 459 | goto err_destroy_workqueue; |
| 460 | |
| 461 | mask = kmalloc(sizeof(*mask), GFP_KERNEL); |
| 462 | if (!mask) |
| 463 | goto err_free_padata; |
| 464 | if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) { |
| 465 | kfree(mask); |
| 466 | goto err_free_padata; |
| 467 | } |
| 468 | |
| 469 | padata_get_cpumask(pcrypt->pinst, PADATA_CPU_SERIAL, mask->mask); |
| 470 | rcu_assign_pointer(pcrypt->cb_cpumask, mask); |
| 471 | |
| 472 | pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify; |
| 473 | ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock); |
| 474 | if (ret) |
| 475 | goto err_free_cpumask; |
| 476 | |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 477 | ret = pcrypt_sysfs_add(pcrypt->pinst, name); |
| 478 | if (ret) |
| 479 | goto err_unregister_notifier; |
| 480 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 481 | return ret; |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 482 | err_unregister_notifier: |
| 483 | padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 484 | err_free_cpumask: |
| 485 | free_cpumask_var(mask->mask); |
| 486 | kfree(mask); |
| 487 | err_free_padata: |
| 488 | padata_free(pcrypt->pinst); |
| 489 | err_destroy_workqueue: |
| 490 | destroy_workqueue(pcrypt->wq); |
| 491 | err: |
| 492 | return ret; |
| 493 | } |
| 494 | |
| 495 | static void __pcrypt_deinit_instance(struct pcrypt_instance *pcrypt) |
| 496 | { |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 497 | kobject_put(&pcrypt->pinst->kobj); |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 498 | free_cpumask_var(pcrypt->cb_cpumask->mask); |
| 499 | kfree(pcrypt->cb_cpumask); |
| 500 | |
| 501 | padata_stop(pcrypt->pinst); |
| 502 | padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock); |
| 503 | destroy_workqueue(pcrypt->wq); |
| 504 | padata_free(pcrypt->pinst); |
| 505 | } |
| 506 | |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 507 | static struct crypto_template pcrypt_tmpl = { |
| 508 | .name = "pcrypt", |
| 509 | .alloc = pcrypt_alloc, |
| 510 | .free = pcrypt_free, |
| 511 | .module = THIS_MODULE, |
| 512 | }; |
| 513 | |
| 514 | static int __init pcrypt_init(void) |
| 515 | { |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 516 | int err = -ENOMEM; |
| 517 | |
| 518 | pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj); |
| 519 | if (!pcrypt_kset) |
| 520 | goto err; |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 521 | |
| 522 | err = __pcrypt_init_instance(&pencrypt, "pencrypt"); |
| 523 | if (err) |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 524 | goto err_unreg_kset; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 525 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 526 | err = __pcrypt_init_instance(&pdecrypt, "pdecrypt"); |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 527 | if (err) |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 528 | goto err_deinit_pencrypt; |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 529 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 530 | padata_start(pencrypt.pinst); |
| 531 | padata_start(pdecrypt.pinst); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 532 | |
| 533 | return crypto_register_template(&pcrypt_tmpl); |
| 534 | |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 535 | err_deinit_pencrypt: |
| 536 | __pcrypt_deinit_instance(&pencrypt); |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 537 | err_unreg_kset: |
| 538 | kset_unregister(pcrypt_kset); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 539 | err: |
Steffen Klassert | 4c87917 | 2010-07-07 15:30:10 +0200 | [diff] [blame] | 540 | return err; |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 541 | } |
| 542 | |
| 543 | static void __exit pcrypt_exit(void) |
| 544 | { |
Dan Kruchinin | e15bacb | 2010-07-14 14:31:57 +0400 | [diff] [blame] | 545 | __pcrypt_deinit_instance(&pencrypt); |
| 546 | __pcrypt_deinit_instance(&pdecrypt); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 547 | |
Dan Kruchinin | a3fb1e3 | 2010-07-14 14:34:15 +0400 | [diff] [blame] | 548 | kset_unregister(pcrypt_kset); |
Steffen Klassert | 5068c7a | 2010-01-07 15:57:19 +1100 | [diff] [blame] | 549 | crypto_unregister_template(&pcrypt_tmpl); |
| 550 | } |
| 551 | |
| 552 | module_init(pcrypt_init); |
| 553 | module_exit(pcrypt_exit); |
| 554 | |
| 555 | MODULE_LICENSE("GPL"); |
| 556 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); |
| 557 | MODULE_DESCRIPTION("Parallel crypto wrapper"); |