Commit dd8b083f authored by Martin K. Petersen's avatar Martin K. Petersen Committed by Herbert Xu
Browse files

crypto: api - Introduce notifier for new crypto algorithms 



Introduce a facility that can be used to receive a notification
callback when a new algorithm becomes available. This can be used by
existing crypto registrations to trigger a switch from a software-only
algorithm to a hardware-accelerated version.

A new CRYPTO_MSG_ALG_LOADED state is introduced to the existing crypto
notification chain, and the register/unregister functions are exported
so they can be called by subsystems outside of crypto.

Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Suggested-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 2fffee53

crypto/algapi.c

+2 −0
Original line number Diff line number Diff line
@@ -372,6 +372,8 @@ static void crypto_wait_for_test(struct crypto_larval *larval) 


	err = wait_for_completion_killable(&larval->completion);

	WARN_ON(err);

	if (!err)

		crypto_probing_notify(CRYPTO_MSG_ALG_LOADED, larval);



out:

	crypto_larval_kill(&larval->alg);

crypto/algboss.c

+2 −0
Original line number Diff line number Diff line
@@ -274,6 +274,8 @@ static int cryptomgr_notify(struct notifier_block *this, unsigned long msg, 
		return cryptomgr_schedule_probe(data);

	case CRYPTO_MSG_ALG_REGISTER:

		return cryptomgr_schedule_test(data);

	case CRYPTO_MSG_ALG_LOADED:

		break;

	}



	return NOTIFY_DONE;

crypto/internal.h

+0 −8
Original line number Diff line number Diff line
@@ -26,12 +26,6 @@ 
#include <linux/rwsem.h>

#include <linux/slab.h>



/* Crypto notification events. */

enum {

	CRYPTO_MSG_ALG_REQUEST,

	CRYPTO_MSG_ALG_REGISTER,

};



struct crypto_instance;

struct crypto_template;
@@ -90,8 +84,6 @@ struct crypto_alg *crypto_find_alg(const char *alg_name, 
void *crypto_alloc_tfm(const char *alg_name,

		       const struct crypto_type *frontend, u32 type, u32 mask);



int crypto_register_notifier(struct notifier_block *nb);

int crypto_unregister_notifier(struct notifier_block *nb);

int crypto_probing_notify(unsigned long val, void *v);



unsigned int crypto_alg_extsize(struct crypto_alg *alg);

include/crypto/algapi.h

+10 −0
Original line number Diff line number Diff line
@@ -427,4 +427,14 @@ static inline void crypto_yield(u32 flags) 
#endif

}



int crypto_register_notifier(struct notifier_block *nb);

int crypto_unregister_notifier(struct notifier_block *nb);



/* Crypto notification events. */

enum {

	CRYPTO_MSG_ALG_REQUEST,

	CRYPTO_MSG_ALG_REGISTER,

	CRYPTO_MSG_ALG_LOADED,

};



#endif	/* _CRYPTO_ALGAPI_H */

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