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crypto: engine - support for batch requests 

Added support for batch requests, per crypto engine.
A new callback is added, do_batch_requests, which executes a
batch of requests. This has the crypto_engine structure as argument
(for cases when more than one crypto-engine is used).
The crypto_engine_alloc_init_and_set function, initializes
crypto-engine, but also, sets the do_batch_requests callback.
On crypto_pump_requests, if do_batch_requests callback is
implemented in a driver, this will be executed. The link between
the requests will be done in driver, if possible.
do_batch_requests is available only if the hardware has support
for multiple request.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Iuliana Prodan 2020-04-28 18:49:05 +03:00 committed by Herbert Xu
parent 6a89f492f8
commit 8d90822643
2 changed files with 31 additions and 1 deletions
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27
crypto/crypto_engine.c
View File

@ -227,6 +227,18 @@ retry:
out:
spin_unlock_irqrestore(&engine->queue_lock, flags);
/*
* Batch requests is possible only if
* hardware can enqueue multiple requests
*/
if (engine->do_batch_requests) {
ret = engine->do_batch_requests(engine);
if (ret)
dev_err(engine->dev, "failed to do batch requests: %d\n",
ret);
}
return;
}
@ -456,6 +468,12 @@ EXPORT_SYMBOL_GPL(crypto_engine_stop);
* crypto-engine queue.
* @dev: the device attached with one hardware engine
* @retry_support: whether hardware has support for retry mechanism
* @cbk_do_batch: pointer to a callback function to be invoked when executing a
* a batch of requests.
* This has the form:
* callback(struct crypto_engine *engine)
* where:
* @engine: the crypto engine structure.
* @rt: whether this queue is set to run as a realtime task
* @qlen: maximum size of the crypto-engine queue
*
@ -464,6 +482,7 @@ EXPORT_SYMBOL_GPL(crypto_engine_stop);
*/
struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
bool retry_support,
int (*cbk_do_batch)(struct crypto_engine *engine),
bool rt, int qlen)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
@ -483,6 +502,12 @@ struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
engine->idling = false;
engine->retry_support = retry_support;
engine->priv_data = dev;
/*
* Batch requests is possible only if
* hardware has support for retry mechanism.
*/
engine->do_batch_requests = retry_support ? cbk_do_batch : NULL;
snprintf(engine->name, sizeof(engine->name),
"%s-engine", dev_name(dev));
@ -516,7 +541,7 @@ EXPORT_SYMBOL_GPL(crypto_engine_alloc_init_and_set);
*/
struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
{
return crypto_engine_alloc_init_and_set(dev, false, rt,
return crypto_engine_alloc_init_and_set(dev, false, NULL, rt,
CRYPTO_ENGINE_MAX_QLEN);
}
EXPORT_SYMBOL_GPL(crypto_engine_alloc_init);

5
include/crypto/engine.h
View File

@ -37,6 +37,8 @@
* @unprepare_crypt_hardware: there are currently no more requests on the
* queue so the subsystem notifies the driver that it may relax the
* hardware by issuing this call
* @do_batch_requests: execute a batch of requests. Depends on multiple
* requests support.
* @kworker: kthread worker struct for request pump
* @pump_requests: work struct for scheduling work to the request pump
* @priv_data: the engine private data
@ -59,6 +61,8 @@ struct crypto_engine {
int (*prepare_crypt_hardware)(struct crypto_engine *engine);
int (*unprepare_crypt_hardware)(struct crypto_engine *engine);
int (*do_batch_requests)(struct crypto_engine *engine);
struct kthread_worker *kworker;
struct kthread_work pump_requests;
@ -107,6 +111,7 @@ int crypto_engine_stop(struct crypto_engine *engine);
struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt);
struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
bool retry_support,
int (*cbk_do_batch)(struct crypto_engine *engine),
bool rt, int qlen);
int crypto_engine_exit(struct crypto_engine *engine);