[GitHub/mt8127/android_kernel_alcatel_ttab.git] / crypto / pcrypt.c

/*
 * pcrypt - Parallel crypto wrapper.
 *
 * Copyright (C) 2009 secunet Security Networks AG
 * Copyright (C) 2009 Steffen Klassert <steffen.klassert@secunet.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <crypto/algapi.h>
#include <crypto/internal/aead.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <crypto/pcrypt.h>

static struct padata_instance *pcrypt_enc_padata;
static struct padata_instance *pcrypt_dec_padata;
static struct workqueue_struct *encwq;
static struct workqueue_struct *decwq;

struct pcrypt_instance_ctx {
	struct crypto_spawn spawn;
	unsigned int tfm_count;
};

struct pcrypt_aead_ctx {
	struct crypto_aead *child;
	unsigned int cb_cpu;
};

static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
			      struct padata_instance *pinst)
{
	unsigned int cpu_index, cpu, i;

	cpu = *cb_cpu;

	if (cpumask_test_cpu(cpu, cpu_active_mask))
			goto out;

	cpu_index = cpu % cpumask_weight(cpu_active_mask);

	cpu = cpumask_first(cpu_active_mask);
	for (i = 0; i < cpu_index; i++)
		cpu = cpumask_next(cpu, cpu_active_mask);

	*cb_cpu = cpu;

out:
	return padata_do_parallel(pinst, padata, cpu);
}

static int pcrypt_aead_setkey(struct crypto_aead *parent,
			      const u8 *key, unsigned int keylen)
{
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);

	return crypto_aead_setkey(ctx->child, key, keylen);
}

static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
				   unsigned int authsize)
{
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);

	return crypto_aead_setauthsize(ctx->child, authsize);
}

static void pcrypt_aead_serial(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_request *req = pcrypt_request_ctx(preq);

	aead_request_complete(req->base.data, padata->info);
}

static void pcrypt_aead_giv_serial(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);

	aead_request_complete(req->areq.base.data, padata->info);
}

static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
{
	struct aead_request *req = areq->data;
	struct pcrypt_request *preq = aead_request_ctx(req);
	struct padata_priv *padata = pcrypt_request_padata(preq);

	padata->info = err;
	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;

	padata_do_serial(padata);
}

static void pcrypt_aead_enc(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_request *req = pcrypt_request_ctx(preq);

	padata->info = crypto_aead_encrypt(req);

	if (padata->info)
		return;

	padata_do_serial(padata);
}

static int pcrypt_aead_encrypt(struct aead_request *req)
{
	int err;
	struct pcrypt_request *preq = aead_request_ctx(req);
	struct aead_request *creq = pcrypt_request_ctx(preq);
	struct padata_priv *padata = pcrypt_request_padata(preq);
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	u32 flags = aead_request_flags(req);

	memset(padata, 0, sizeof(struct padata_priv));

	padata->parallel = pcrypt_aead_enc;
	padata->serial = pcrypt_aead_serial;

	aead_request_set_tfm(creq, ctx->child);
	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
				  pcrypt_aead_done, req);
	aead_request_set_crypt(creq, req->src, req->dst,
			       req->cryptlen, req->iv);
	aead_request_set_assoc(creq, req->assoc, req->assoclen);

	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
	if (err)
		return err;
	else
		err = crypto_aead_encrypt(creq);

	return err;
}

static void pcrypt_aead_dec(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_request *req = pcrypt_request_ctx(preq);

	padata->info = crypto_aead_decrypt(req);

	if (padata->info)
		return;

	padata_do_serial(padata);
}

static int pcrypt_aead_decrypt(struct aead_request *req)
{
	int err;
	struct pcrypt_request *preq = aead_request_ctx(req);
	struct aead_request *creq = pcrypt_request_ctx(preq);
	struct padata_priv *padata = pcrypt_request_padata(preq);
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	u32 flags = aead_request_flags(req);

	memset(padata, 0, sizeof(struct padata_priv));

	padata->parallel = pcrypt_aead_dec;
	padata->serial = pcrypt_aead_serial;

	aead_request_set_tfm(creq, ctx->child);
	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
				  pcrypt_aead_done, req);
	aead_request_set_crypt(creq, req->src, req->dst,
			       req->cryptlen, req->iv);
	aead_request_set_assoc(creq, req->assoc, req->assoclen);

	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);
	if (err)
		return err;
	else
		err = crypto_aead_decrypt(creq);

	return err;
}

static void pcrypt_aead_givenc(struct padata_priv *padata)
{
	struct pcrypt_request *preq = pcrypt_padata_request(padata);
	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);

	padata->info = crypto_aead_givencrypt(req);

	if (padata->info)
		return;

	padata_do_serial(padata);
}

static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
{
	int err;
	struct aead_request *areq = &req->areq;
	struct pcrypt_request *preq = aead_request_ctx(areq);
	struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq);
	struct padata_priv *padata = pcrypt_request_padata(preq);
	struct crypto_aead *aead = aead_givcrypt_reqtfm(req);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
	u32 flags = aead_request_flags(areq);

	memset(padata, 0, sizeof(struct padata_priv));

	padata->parallel = pcrypt_aead_givenc;
	padata->serial = pcrypt_aead_giv_serial;

	aead_givcrypt_set_tfm(creq, ctx->child);
	aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
				   pcrypt_aead_done, areq);
	aead_givcrypt_set_crypt(creq, areq->src, areq->dst,
				areq->cryptlen, areq->iv);
	aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);
	aead_givcrypt_set_giv(creq, req->giv, req->seq);

	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
	if (err)
		return err;
	else
		err = crypto_aead_givencrypt(creq);

	return err;
}

static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
{
	int cpu, cpu_index;
	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
	struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst);
	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
	struct crypto_aead *cipher;

	ictx->tfm_count++;

	cpu_index = ictx->tfm_count % cpumask_weight(cpu_active_mask);

	ctx->cb_cpu = cpumask_first(cpu_active_mask);
	for (cpu = 0; cpu < cpu_index; cpu++)
		ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_active_mask);

	cipher = crypto_spawn_aead(crypto_instance_ctx(inst));

	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	ctx->child = cipher;
	tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)
		+ sizeof(struct aead_givcrypt_request)
		+ crypto_aead_reqsize(cipher);

	return 0;
}

static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm)
{
	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);

	crypto_free_aead(ctx->child);
}

static struct crypto_instance *pcrypt_alloc_instance(struct crypto_alg *alg)
{
	struct crypto_instance *inst;
	struct pcrypt_instance_ctx *ctx;
	int err;

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst) {
		inst = ERR_PTR(-ENOMEM);
		goto out;
	}

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto out_free_inst;

	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);

	ctx = crypto_instance_ctx(inst);
	err = crypto_init_spawn(&ctx->spawn, alg, inst,
				CRYPTO_ALG_TYPE_MASK);
	if (err)
		goto out_free_inst;

	inst->alg.cra_priority = alg->cra_priority + 100;
	inst->alg.cra_blocksize = alg->cra_blocksize;
	inst->alg.cra_alignmask = alg->cra_alignmask;

out:
	return inst;

out_free_inst:
	kfree(inst);
	inst = ERR_PTR(err);
	goto out;
}

static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;
	struct crypto_attr_type *algt;

	algt = crypto_get_attr_type(tb);

	alg = crypto_get_attr_alg(tb, algt->type,
				  (algt->mask & CRYPTO_ALG_TYPE_MASK));
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	inst = pcrypt_alloc_instance(alg);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
	inst->alg.cra_type = &crypto_aead_type;

	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;

	inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);

	inst->alg.cra_init = pcrypt_aead_init_tfm;
	inst->alg.cra_exit = pcrypt_aead_exit_tfm;

	inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
	inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
	inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
	inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
	inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

static struct crypto_instance *pcrypt_alloc(struct rtattr **tb)
{
	struct crypto_attr_type *algt;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return ERR_CAST(algt);

	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
	case CRYPTO_ALG_TYPE_AEAD:
		return pcrypt_alloc_aead(tb);
	}

	return ERR_PTR(-EINVAL);
}

static void pcrypt_free(struct crypto_instance *inst)
{
	struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);

	crypto_drop_spawn(&ctx->spawn);
	kfree(inst);
}

static struct crypto_template pcrypt_tmpl = {
	.name = "pcrypt",
	.alloc = pcrypt_alloc,
	.free = pcrypt_free,
	.module = THIS_MODULE,
};

static int __init pcrypt_init(void)
{
	encwq = create_workqueue("pencrypt");
	if (!encwq)
		goto err;

	decwq = create_workqueue("pdecrypt");
	if (!decwq)
		goto err_destroy_encwq;


	pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);
	if (!pcrypt_enc_padata)
		goto err_destroy_decwq;

	pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
	if (!pcrypt_dec_padata)
		goto err_free_padata;

	padata_start(pcrypt_enc_padata);
	padata_start(pcrypt_dec_padata);

	return crypto_register_template(&pcrypt_tmpl);

err_free_padata:
	padata_free(pcrypt_enc_padata);

err_destroy_decwq:
	destroy_workqueue(decwq);

err_destroy_encwq:
	destroy_workqueue(encwq);

err:
	return -ENOMEM;
}

static void __exit pcrypt_exit(void)
{
	padata_stop(pcrypt_enc_padata);
	padata_stop(pcrypt_dec_padata);

	destroy_workqueue(encwq);
	destroy_workqueue(decwq);

	padata_free(pcrypt_enc_padata);
	padata_free(pcrypt_dec_padata);

	crypto_unregister_template(&pcrypt_tmpl);
}

module_init(pcrypt_init);
module_exit(pcrypt_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
MODULE_DESCRIPTION("Parallel crypto wrapper");
Commit	Line	Data
5068c7a8 SK	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>
	27	#include <crypto/pcrypt.h>
	28
	29	static struct padata_instance *pcrypt_enc_padata;
	30	static struct padata_instance *pcrypt_dec_padata;
	31	static struct workqueue_struct *encwq;
	32	static struct workqueue_struct *decwq;
	33
	34	struct pcrypt_instance_ctx {
	35	struct crypto_spawn spawn;
	36	unsigned int tfm_count;
	37	};
	38
	39	struct pcrypt_aead_ctx {
	40	struct crypto_aead *child;
	41	unsigned int cb_cpu;
	42	};
	43
	44	static int pcrypt_do_parallel(struct padata_priv padata, unsigned int cb_cpu,
	45	struct padata_instance *pinst)
	46	{
	47	unsigned int cpu_index, cpu, i;
	48
	49	cpu = *cb_cpu;
	50
	51	if (cpumask_test_cpu(cpu, cpu_active_mask))
	52	goto out;
	53
	54	cpu_index = cpu % cpumask_weight(cpu_active_mask);
	55
	56	cpu = cpumask_first(cpu_active_mask);
	57	for (i = 0; i < cpu_index; i++)
	58	cpu = cpumask_next(cpu, cpu_active_mask);
	59
	60	*cb_cpu = cpu;
	61
	62	out:
	63	return padata_do_parallel(pinst, padata, cpu);
	64	}
65
66	static int pcrypt_aead_setkey(struct crypto_aead *parent,
67	const u8 *key, unsigned int keylen)
68	{
69	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
70
71	return crypto_aead_setkey(ctx->child, key, keylen);
72	}
73
74	static int pcrypt_aead_setauthsize(struct crypto_aead *parent,
75	unsigned int authsize)
76	{
77	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(parent);
78
79	return crypto_aead_setauthsize(ctx->child, authsize);
80	}
81
82	static void pcrypt_aead_serial(struct padata_priv *padata)
83	{
84	struct pcrypt_request *preq = pcrypt_padata_request(padata);
85	struct aead_request *req = pcrypt_request_ctx(preq);
86
87	aead_request_complete(req->base.data, padata->info);
88	}
89
90	static void pcrypt_aead_giv_serial(struct padata_priv *padata)
91	{
92	struct pcrypt_request *preq = pcrypt_padata_request(padata);
93	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
94
95	aead_request_complete(req->areq.base.data, padata->info);
96	}
97
98	static void pcrypt_aead_done(struct crypto_async_request *areq, int err)
99	{
100	struct aead_request *req = areq->data;
101	struct pcrypt_request *preq = aead_request_ctx(req);
102	struct padata_priv *padata = pcrypt_request_padata(preq);
103
104	padata->info = err;
105	req->base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
106
107	padata_do_serial(padata);
108	}
109
110	static void pcrypt_aead_enc(struct padata_priv *padata)
111	{
112	struct pcrypt_request *preq = pcrypt_padata_request(padata);
113	struct aead_request *req = pcrypt_request_ctx(preq);
114
115	padata->info = crypto_aead_encrypt(req);
116
117	if (padata->info)
118	return;
119
120	padata_do_serial(padata);
121	}
122
123	static int pcrypt_aead_encrypt(struct aead_request *req)
124	{
125	int err;
126	struct pcrypt_request *preq = aead_request_ctx(req);
127	struct aead_request *creq = pcrypt_request_ctx(preq);
128	struct padata_priv *padata = pcrypt_request_padata(preq);
129	struct crypto_aead *aead = crypto_aead_reqtfm(req);
130	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
131	u32 flags = aead_request_flags(req);
132
133	memset(padata, 0, sizeof(struct padata_priv));
134
135	padata->parallel = pcrypt_aead_enc;
136	padata->serial = pcrypt_aead_serial;
137
138	aead_request_set_tfm(creq, ctx->child);
139	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
140	pcrypt_aead_done, req);
141	aead_request_set_crypt(creq, req->src, req->dst,
142	req->cryptlen, req->iv);
143	aead_request_set_assoc(creq, req->assoc, req->assoclen);
144
145	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
146	if (err)
147	return err;
148	else
149	err = crypto_aead_encrypt(creq);
150
151	return err;
152	}
153
154	static void pcrypt_aead_dec(struct padata_priv *padata)
155	{
156	struct pcrypt_request *preq = pcrypt_padata_request(padata);
157	struct aead_request *req = pcrypt_request_ctx(preq);
158
159	padata->info = crypto_aead_decrypt(req);
160
161	if (padata->info)
162	return;
163
164	padata_do_serial(padata);
165	}
166
167	static int pcrypt_aead_decrypt(struct aead_request *req)
168	{
169	int err;
170	struct pcrypt_request *preq = aead_request_ctx(req);
171	struct aead_request *creq = pcrypt_request_ctx(preq);
172	struct padata_priv *padata = pcrypt_request_padata(preq);
173	struct crypto_aead *aead = crypto_aead_reqtfm(req);
174	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
175	u32 flags = aead_request_flags(req);
176
177	memset(padata, 0, sizeof(struct padata_priv));
178
179	padata->parallel = pcrypt_aead_dec;
180	padata->serial = pcrypt_aead_serial;
181
182	aead_request_set_tfm(creq, ctx->child);
183	aead_request_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
184	pcrypt_aead_done, req);
185	aead_request_set_crypt(creq, req->src, req->dst,
186	req->cryptlen, req->iv);
187	aead_request_set_assoc(creq, req->assoc, req->assoclen);
188
189	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);
190	if (err)
191	return err;
192	else
193	err = crypto_aead_decrypt(creq);
194
195	return err;
196	}
197
198	static void pcrypt_aead_givenc(struct padata_priv *padata)
199	{
200	struct pcrypt_request *preq = pcrypt_padata_request(padata);
201	struct aead_givcrypt_request *req = pcrypt_request_ctx(preq);
202
203	padata->info = crypto_aead_givencrypt(req);
204
205	if (padata->info)
206	return;
207
208	padata_do_serial(padata);
209	}
210
211	static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
212	{
213	int err;
214	struct aead_request *areq = &req->areq;
215	struct pcrypt_request *preq = aead_request_ctx(areq);
216	struct aead_givcrypt_request *creq = pcrypt_request_ctx(preq);
217	struct padata_priv *padata = pcrypt_request_padata(preq);
218	struct crypto_aead *aead = aead_givcrypt_reqtfm(req);
219	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(aead);
220	u32 flags = aead_request_flags(areq);
221
222	memset(padata, 0, sizeof(struct padata_priv));
223
224	padata->parallel = pcrypt_aead_givenc;
225	padata->serial = pcrypt_aead_giv_serial;
226
227	aead_givcrypt_set_tfm(creq, ctx->child);
228	aead_givcrypt_set_callback(creq, flags & ~CRYPTO_TFM_REQ_MAY_SLEEP,
229	pcrypt_aead_done, areq);
230	aead_givcrypt_set_crypt(creq, areq->src, areq->dst,
231	areq->cryptlen, areq->iv);
232	aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);
233	aead_givcrypt_set_giv(creq, req->giv, req->seq);
234
235	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
236	if (err)
237	return err;
238	else
239	err = crypto_aead_givencrypt(creq);
240
241	return err;
242	}
243
244	static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
245	{
246	int cpu, cpu_index;
247	struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
248	struct pcrypt_instance_ctx *ictx = crypto_instance_ctx(inst);
249	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
250	struct crypto_aead *cipher;
251
252	ictx->tfm_count++;
253
254	cpu_index = ictx->tfm_count % cpumask_weight(cpu_active_mask);
255
256	ctx->cb_cpu = cpumask_first(cpu_active_mask);
257	for (cpu = 0; cpu < cpu_index; cpu++)
258	ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_active_mask);
259
260	cipher = crypto_spawn_aead(crypto_instance_ctx(inst));
261
262	if (IS_ERR(cipher))
263	return PTR_ERR(cipher);
264
265	ctx->child = cipher;
266	tfm->crt_aead.reqsize = sizeof(struct pcrypt_request)
267	+ sizeof(struct aead_givcrypt_request)
268	+ crypto_aead_reqsize(cipher);
269
270	return 0;
271	}
272
273	static void pcrypt_aead_exit_tfm(struct crypto_tfm *tfm)
274	{
275	struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
276
277	crypto_free_aead(ctx->child);
278	}
279
280	static struct crypto_instance pcrypt_alloc_instance(struct crypto_alg alg)
281	{
282	struct crypto_instance *inst;
283	struct pcrypt_instance_ctx *ctx;
284	int err;
285
286	inst = kzalloc(sizeof(inst) + sizeof(ctx), GFP_KERNEL);
287	if (!inst) {
288	inst = ERR_PTR(-ENOMEM);
289	goto out;
290	}
291
292	err = -ENAMETOOLONG;
293	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
294	"pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
295	goto out_free_inst;
296
297	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
298
299	ctx = crypto_instance_ctx(inst);
300	err = crypto_init_spawn(&ctx->spawn, alg, inst,
301	CRYPTO_ALG_TYPE_MASK);
302	if (err)
303	goto out_free_inst;
304
305	inst->alg.cra_priority = alg->cra_priority + 100;
306	inst->alg.cra_blocksize = alg->cra_blocksize;
307	inst->alg.cra_alignmask = alg->cra_alignmask;
308
309	out:
310	return inst;
311
312	out_free_inst:
313	kfree(inst);
314	inst = ERR_PTR(err);
315	goto out;
316	}
317
318	static struct crypto_instance pcrypt_alloc_aead(struct rtattr *tb)
319	{
320	struct crypto_instance *inst;
321	struct crypto_alg *alg;
322	struct crypto_attr_type *algt;
323
324	algt = crypto_get_attr_type(tb);
325
326	alg = crypto_get_attr_alg(tb, algt->type,
327	(algt->mask & CRYPTO_ALG_TYPE_MASK));
328	if (IS_ERR(alg))
329	return ERR_CAST(alg);
330
331	inst = pcrypt_alloc_instance(alg);
332	if (IS_ERR(inst))
333	goto out_put_alg;
334
335	inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD \| CRYPTO_ALG_ASYNC;
336	inst->alg.cra_type = &crypto_aead_type;
337
338	inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize;
339	inst->alg.cra_aead.geniv = alg->cra_aead.geniv;
340	inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize;
341
342	inst->alg.cra_ctxsize = sizeof(struct pcrypt_aead_ctx);
343
344	inst->alg.cra_init = pcrypt_aead_init_tfm;
345	inst->alg.cra_exit = pcrypt_aead_exit_tfm;
346
347	inst->alg.cra_aead.setkey = pcrypt_aead_setkey;
348	inst->alg.cra_aead.setauthsize = pcrypt_aead_setauthsize;
349	inst->alg.cra_aead.encrypt = pcrypt_aead_encrypt;
350	inst->alg.cra_aead.decrypt = pcrypt_aead_decrypt;
351	inst->alg.cra_aead.givencrypt = pcrypt_aead_givencrypt;
352
353	out_put_alg:
354	crypto_mod_put(alg);
355	return inst;
356	}
357
358	static struct crypto_instance pcrypt_alloc(struct rtattr *tb)
359	{
360	struct crypto_attr_type *algt;
361
362	algt = crypto_get_attr_type(tb);
363	if (IS_ERR(algt))
364	return ERR_CAST(algt);
365
366	switch (algt->type & algt->mask & CRYPTO_ALG_TYPE_MASK) {
367	case CRYPTO_ALG_TYPE_AEAD:
368	return pcrypt_alloc_aead(tb);
369	}
370
371	return ERR_PTR(-EINVAL);
372	}
373
374	static void pcrypt_free(struct crypto_instance *inst)
375	{
376	struct pcrypt_instance_ctx *ctx = crypto_instance_ctx(inst);
377
378	crypto_drop_spawn(&ctx->spawn);
379	kfree(inst);
380	}
381
382	static struct crypto_template pcrypt_tmpl = {
383	.name = "pcrypt",
384	.alloc = pcrypt_alloc,
385	.free = pcrypt_free,
386	.module = THIS_MODULE,
387	};
388
389	static int __init pcrypt_init(void)
390	{
391	encwq = create_workqueue("pencrypt");
392	if (!encwq)
393	goto err;
394
395	decwq = create_workqueue("pdecrypt");
396	if (!decwq)
397	goto err_destroy_encwq;
398
399
400	pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);
401	if (!pcrypt_enc_padata)
402	goto err_destroy_decwq;
403
404	pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
405	if (!pcrypt_dec_padata)
406	goto err_free_padata;
407
408	padata_start(pcrypt_enc_padata);
409	padata_start(pcrypt_dec_padata);
410
411	return crypto_register_template(&pcrypt_tmpl);
412
413	err_free_padata:
414	padata_free(pcrypt_enc_padata);
415
416	err_destroy_decwq:
417	destroy_workqueue(decwq);
418
419	err_destroy_encwq:
420	destroy_workqueue(encwq);
421
422	err:
423	return -ENOMEM;
424	}
425
426	static void __exit pcrypt_exit(void)
427	{
428	padata_stop(pcrypt_enc_padata);
429	padata_stop(pcrypt_dec_padata);
430
431	destroy_workqueue(encwq);
432	destroy_workqueue(decwq);
433
434	padata_free(pcrypt_enc_padata);
435	padata_free(pcrypt_dec_padata);
436
437	crypto_unregister_template(&pcrypt_tmpl);
438	}
439
440	module_init(pcrypt_init);
441	module_exit(pcrypt_exit);
442
443	MODULE_LICENSE("GPL");
444	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
445	MODULE_DESCRIPTION("Parallel crypto wrapper");