[mirror_ubuntu-zesty-kernel.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/atomic.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/kobject.h>
#include <linux/cpu.h>
#include <crypto/pcrypt.h>

struct padata_pcrypt {
	struct padata_instance *pinst;
	struct workqueue_struct *wq;

	/*
	 * Cpumask for callback CPUs. It should be
	 * equal to serial cpumask of corresponding padata instance,
	 * so it is updated when padata notifies us about serial
	 * cpumask change.
	 *
	 * cb_cpumask is protected by RCU. This fact prevents us from
	 * using cpumask_var_t directly because the actual type of
	 * cpumsak_var_t depends on kernel configuration(particularly on
	 * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
	 * cpumask_var_t may be either a pointer to the struct cpumask
	 * or a variable allocated on the stack. Thus we can not safely use
	 * cpumask_var_t with RCU operations such as rcu_assign_pointer or
	 * rcu_dereference. So cpumask_var_t is wrapped with struct
	 * pcrypt_cpumask which makes possible to use it with RCU.
	 */
	struct pcrypt_cpumask {
		cpumask_var_t mask;
	} *cb_cpumask;
	struct notifier_block nblock;
};

static struct padata_pcrypt pencrypt;
static struct padata_pcrypt pdecrypt;
static struct kset           *pcrypt_kset;

struct pcrypt_instance_ctx {
	struct crypto_aead_spawn spawn;
	atomic_t 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_pcrypt *pcrypt)
{
	unsigned int cpu_index, cpu, i;
	struct pcrypt_cpumask *cpumask;

	cpu = *cb_cpu;

	rcu_read_lock_bh();
	cpumask = rcu_dereference_bh(pcrypt->cb_cpumask);
	if (cpumask_test_cpu(cpu, cpumask->mask))
			goto out;

	if (!cpumask_weight(cpumask->mask))
			goto out;

	cpu_index = cpu % cpumask_weight(cpumask->mask);

	cpu = cpumask_first(cpumask->mask);
	for (i = 0; i < cpu_index; i++)
		cpu = cpumask_next(cpu, cpumask->mask);

	*cb_cpu = cpu;

out:
	rcu_read_unlock_bh();
	return padata_do_parallel(pcrypt->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_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 == -EINPROGRESS)
		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_ad(creq, req->assoclen);

	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
	if (!err)
		return -EINPROGRESS;

	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 == -EINPROGRESS)
		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_ad(creq, req->assoclen);

	err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
	if (!err)
		return -EINPROGRESS;

	return err;
}

static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
{
	int cpu, cpu_index;
	struct aead_instance *inst = aead_alg_instance(tfm);
	struct pcrypt_instance_ctx *ictx = aead_instance_ctx(inst);
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
	struct crypto_aead *cipher;

	cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
		    cpumask_weight(cpu_online_mask);

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

	cipher = crypto_spawn_aead(&ictx->spawn);

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

	ctx->child = cipher;
	crypto_aead_set_reqsize(tfm, sizeof(struct pcrypt_request) +
				     sizeof(struct aead_request) +
				     crypto_aead_reqsize(cipher));

	return 0;
}

static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
{
	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_aead(ctx->child);
}

static int pcrypt_init_instance(struct crypto_instance *inst,
				struct crypto_alg *alg)
{
	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		return -ENAMETOOLONG;

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

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

	return 0;
}

static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
			      u32 type, u32 mask)
{
	struct pcrypt_instance_ctx *ctx;
	struct crypto_attr_type *algt;
	struct aead_instance *inst;
	struct aead_alg *alg;
	const char *name;
	int err;

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

	name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(name))
		return PTR_ERR(name);

	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;

	ctx = aead_instance_ctx(inst);
	crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));

	err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
	if (err)
		goto out_free_inst;

	alg = crypto_spawn_aead_alg(&ctx->spawn);
	err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
	if (err)
		goto out_drop_aead;

	inst->alg.base.cra_flags = CRYPTO_ALG_ASYNC;

	inst->alg.ivsize = crypto_aead_alg_ivsize(alg);
	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);

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

	inst->alg.init = pcrypt_aead_init_tfm;
	inst->alg.exit = pcrypt_aead_exit_tfm;

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

	err = aead_register_instance(tmpl, inst);
	if (err)
		goto out_drop_aead;

out:
	return err;

out_drop_aead:
	crypto_drop_aead(&ctx->spawn);
out_free_inst:
	kfree(inst);
	goto out;
}

static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	struct crypto_attr_type *algt;

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

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

	return -EINVAL;
}

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

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

static int pcrypt_cpumask_change_notify(struct notifier_block *self,
					unsigned long val, void *data)
{
	struct padata_pcrypt *pcrypt;
	struct pcrypt_cpumask *new_mask, *old_mask;
	struct padata_cpumask *cpumask = (struct padata_cpumask *)data;

	if (!(val & PADATA_CPU_SERIAL))
		return 0;

	pcrypt = container_of(self, struct padata_pcrypt, nblock);
	new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
	if (!new_mask)
		return -ENOMEM;
	if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
		kfree(new_mask);
		return -ENOMEM;
	}

	old_mask = pcrypt->cb_cpumask;

	cpumask_copy(new_mask->mask, cpumask->cbcpu);
	rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
	synchronize_rcu_bh();

	free_cpumask_var(old_mask->mask);
	kfree(old_mask);
	return 0;
}

static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
{
	int ret;

	pinst->kobj.kset = pcrypt_kset;
	ret = kobject_add(&pinst->kobj, NULL, name);
	if (!ret)
		kobject_uevent(&pinst->kobj, KOBJ_ADD);

	return ret;
}

static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
			      const char *name)
{
	int ret = -ENOMEM;
	struct pcrypt_cpumask *mask;

	get_online_cpus();

	pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM | WQ_CPU_INTENSIVE,
				     1, name);
	if (!pcrypt->wq)
		goto err;

	pcrypt->pinst = padata_alloc_possible(pcrypt->wq);
	if (!pcrypt->pinst)
		goto err_destroy_workqueue;

	mask = kmalloc(sizeof(*mask), GFP_KERNEL);
	if (!mask)
		goto err_free_padata;
	if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
		kfree(mask);
		goto err_free_padata;
	}

	cpumask_and(mask->mask, cpu_possible_mask, cpu_online_mask);
	rcu_assign_pointer(pcrypt->cb_cpumask, mask);

	pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
	ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
	if (ret)
		goto err_free_cpumask;

	ret = pcrypt_sysfs_add(pcrypt->pinst, name);
	if (ret)
		goto err_unregister_notifier;

	put_online_cpus();

	return ret;

err_unregister_notifier:
	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
err_free_cpumask:
	free_cpumask_var(mask->mask);
	kfree(mask);
err_free_padata:
	padata_free(pcrypt->pinst);
err_destroy_workqueue:
	destroy_workqueue(pcrypt->wq);
err:
	put_online_cpus();

	return ret;
}

static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt)
{
	free_cpumask_var(pcrypt->cb_cpumask->mask);
	kfree(pcrypt->cb_cpumask);

	padata_stop(pcrypt->pinst);
	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
	destroy_workqueue(pcrypt->wq);
	padata_free(pcrypt->pinst);
}

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

static int __init pcrypt_init(void)
{
	int err = -ENOMEM;

	pcrypt_kset = kset_create_and_add("pcrypt", NULL, kernel_kobj);
	if (!pcrypt_kset)
		goto err;

	err = pcrypt_init_padata(&pencrypt, "pencrypt");
	if (err)
		goto err_unreg_kset;

	err = pcrypt_init_padata(&pdecrypt, "pdecrypt");
	if (err)
		goto err_deinit_pencrypt;

	padata_start(pencrypt.pinst);
	padata_start(pdecrypt.pinst);

	return crypto_register_template(&pcrypt_tmpl);

err_deinit_pencrypt:
	pcrypt_fini_padata(&pencrypt);
err_unreg_kset:
	kset_unregister(pcrypt_kset);
err:
	return err;
}

static void __exit pcrypt_exit(void)
{
	pcrypt_fini_padata(&pencrypt);
	pcrypt_fini_padata(&pdecrypt);

	kset_unregister(pcrypt_kset);
	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");
MODULE_ALIAS_CRYPTO("pcrypt");
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>
a5a22e57	23	#include <linux/atomic.h>
5068c7a8 SK	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>
5068c7a8 SK	31	#include <crypto/pcrypt.h>
5068c7a8 SK	32
c57e842e	33	struct padata_pcrypt {
e15bacbe DK	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	59	static struct padata_pcrypt pencrypt;
c57e842e SK	60	static struct padata_pcrypt pdecrypt;
a3fb1e33	61	static struct kset *pcrypt_kset;
5068c7a8 SK	62
5068c7a8 SK	63	struct pcrypt_instance_ctx {
66d948e7	64	struct crypto_aead_spawn spawn;
a5a22e57	65	atomic_t tfm_count;
5068c7a8 SK	66	};
	67
	68	struct pcrypt_aead_ctx {
	69	struct crypto_aead *child;
	70	unsigned int cb_cpu;
	71	};
	72
	73	static int pcrypt_do_parallel(struct padata_priv padata, unsigned int cb_cpu,
c57e842e	74	struct padata_pcrypt *pcrypt)
5068c7a8 SK	75	{
5068c7a8 SK	76	unsigned int cpu_index, cpu, i;
e15bacbe	77	struct pcrypt_cpumask *cpumask;
5068c7a8 SK	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 SK	84	goto out;
5068c7a8 SK	85
cc74f4bc SK	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);
5068c7a8 SK	94
	95	*cb_cpu = cpu;
	96
	97	out:
e15bacbe DK	98	rcu_read_unlock_bh();
e15bacbe DK	99	return padata_do_parallel(pcrypt->pinst, padata, cpu);
5068c7a8 SK	100	}
	101
	102	static 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
	110	static 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
	118	static 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
5068c7a8 SK	126	static 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
	138	static 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)
5068c7a8 SK	146	return;
	147
	148	padata_do_serial(padata);
	149	}
	150
	151	static 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);
83f619f3 SK	174	if (!err)
83f619f3 SK	175	return -EINPROGRESS;
5068c7a8 SK	176
	177	return err;
	178	}
	179
	180	static 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)
5068c7a8 SK	188	return;
	189
	190	padata_do_serial(padata);
	191	}
	192
	193	static 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 SK	216	if (!err)
83f619f3 SK	217	return -EINPROGRESS;
5068c7a8 SK	218
	219	return err;
	220	}
	221
0496f560	222	static int pcrypt_aead_init_tfm(struct crypto_aead *tfm)
5068c7a8 SK	223	{
5068c7a8 SK	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);
5068c7a8 SK	228	struct crypto_aead *cipher;
5068c7a8 SK	229
a5a22e57 HX	230	cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
a5a22e57 HX	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);
5068c7a8 SK	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 SK	246
	247	return 0;
	248	}
	249
0496f560	250	static void pcrypt_aead_exit_tfm(struct crypto_aead *tfm)
5068c7a8	251	{
0496f560	252	struct pcrypt_aead_ctx *ctx = crypto_aead_ctx(tfm);
5068c7a8 SK	253
	254	crypto_free_aead(ctx->child);
	255	}
	256
66d948e7 HX	257	static int pcrypt_init_instance(struct crypto_instance *inst,
66d948e7 HX	258	struct crypto_alg *alg)
5068c7a8	259	{
5068c7a8 SK	260	if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
5068c7a8 SK	261	"pcrypt(%s)", alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
66d948e7	262	return -ENAMETOOLONG;
5068c7a8 SK	263
	264	memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
	265
5068c7a8 SK	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	}
5068c7a8 SK	272
0496f560 HX	273	static int pcrypt_create_aead(struct crypto_template tmpl, struct rtattr *tb,
0496f560 HX	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;
0496f560 HX	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]);
66d948e7 HX	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);
0496f560 HX	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)
66d948e7 HX	300	goto out_free_inst;
5068c7a8	301
0496f560 HX	302	alg = crypto_spawn_aead_alg(&ctx->spawn);
0496f560 HX	303	err = pcrypt_init_instance(aead_crypto_instance(inst), &alg->base);
66d948e7 HX	304	if (err)
66d948e7 HX	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);
0496f560 HX	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;
0496f560 HX	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	326	out:
0496f560	327	return err;
66d948e7 HX	328
	329	out_drop_aead:
	330	crypto_drop_aead(&ctx->spawn);
	331	out_free_inst:
	332	kfree(inst);
66d948e7	333	goto out;
5068c7a8 SK	334	}
5068c7a8 SK	335
0496f560	336	static 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	}
5068c7a8 SK	348
0496f560	349	return -EINVAL;
5068c7a8 SK	350	}
	351
	352	static 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	360	static 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	390	static 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	402	static int pcrypt_init_padata(struct padata_pcrypt *pcrypt,
c57e842e SK	403	const char *name)
e15bacbe DK	404	{
	405	int ret = -ENOMEM;
	406	struct pcrypt_cpumask *mask;
	407
d3f64e46 SK	408	get_online_cpus();
d3f64e46 SK	409
d8537548 KC	410	pcrypt->wq = alloc_workqueue("%s", WQ_MEM_RECLAIM \| WQ_CPU_INTENSIVE,
d8537548 KC	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();
d3f64e46 SK	440
e15bacbe	441	return ret;
d3f64e46	442
a3fb1e33 DK	443	err_unregister_notifier:
a3fb1e33 DK	444	padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
e15bacbe DK	445	err_free_cpumask:
	446	free_cpumask_var(mask->mask);
	447	kfree(mask);
	448	err_free_padata:
	449	padata_free(pcrypt->pinst);
	450	err_destroy_workqueue:
	451	destroy_workqueue(pcrypt->wq);
	452	err:
d3f64e46 SK	453	put_online_cpus();
d3f64e46 SK	454
e15bacbe DK	455	return ret;
	456	}
	457
c57e842e	458	static 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 SK	469	static struct crypto_template pcrypt_tmpl = {
5068c7a8 SK	470	.name = "pcrypt",
0496f560	471	.create = pcrypt_create,
5068c7a8 SK	472	.free = pcrypt_free,
	473	.module = THIS_MODULE,
	474	};
	475
	476	static 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);
e15bacbe DK	493	padata_start(pdecrypt.pinst);
5068c7a8	494
e15bacbe	495	return crypto_register_template(&pcrypt_tmpl);
5068c7a8	496
e15bacbe	497	err_deinit_pencrypt:
c57e842e	498	pcrypt_fini_padata(&pencrypt);
a3fb1e33 DK	499	err_unreg_kset:
a3fb1e33 DK	500	kset_unregister(pcrypt_kset);
5068c7a8	501	err:
4c879170	502	return err;
5068c7a8 SK	503	}
	504
	505	static void __exit pcrypt_exit(void)
	506	{
c57e842e SK	507	pcrypt_fini_padata(&pencrypt);
c57e842e SK	508	pcrypt_fini_padata(&pdecrypt);
5068c7a8	509
a3fb1e33	510	kset_unregister(pcrypt_kset);
5068c7a8 SK	511	crypto_unregister_template(&pcrypt_tmpl);
	512	}
	513
	514	module_init(pcrypt_init);
	515	module_exit(pcrypt_exit);
	516
	517	MODULE_LICENSE("GPL");
	518	MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
	519	MODULE_DESCRIPTION("Parallel crypto wrapper");
4943ba16	520	MODULE_ALIAS_CRYPTO("pcrypt");