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Subject[PATCH v4 2/2] crypto: engine - support for batch requests
Date
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>
---
crypto/crypto_engine.c | 30 +++++++++++++++++++++++++++---
include/crypto/engine.h | 4 ++++
2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index dbfd53c2..80723ad 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -116,8 +116,10 @@ static void crypto_pump_requests(struct crypto_engine *engine,
/* Get the fist request from the engine queue to handle */
backlog = crypto_get_backlog(&engine->queue);
async_req = crypto_dequeue_request(&engine->queue);
- if (!async_req)
- goto out;
+ if (!async_req) {
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ goto batch;
+ }

if (backlog)
backlog->complete(backlog, -EINPROGRESS);
@@ -195,6 +197,19 @@ static void crypto_pump_requests(struct crypto_engine *engine,

out:
spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+batch:
+ /*
+ * 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;
}

static void crypto_pump_work(struct kthread_work *work)
@@ -422,6 +437,12 @@ EXPORT_SYMBOL_GPL(crypto_engine_stop);
* and initialize it by setting the maximum number of entries in the software
* crypto-engine queue.
* @dev: the device attached with one hardware engine
+ * @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
*
@@ -429,6 +450,7 @@ EXPORT_SYMBOL_GPL(crypto_engine_stop);
* Return: the crypto engine structure on success, else NULL.
*/
struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
+ int (*cbk_do_batch)(struct crypto_engine *engine),
bool rt, int qlen)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
@@ -449,6 +471,8 @@ struct crypto_engine *crypto_engine_alloc_init_and_set(struct device *dev,
engine->cnt_do_req = 0;
engine->cnt_finalize = 0;
engine->priv_data = dev;
+ engine->do_batch_requests = cbk_do_batch;
+
snprintf(engine->name, sizeof(engine->name),
"%s-engine", dev_name(dev));

@@ -482,7 +506,7 @@ 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, rt,
+ return crypto_engine_alloc_init_and_set(dev, NULL, rt,
CRYPTO_ENGINE_MAX_QLEN);
}
EXPORT_SYMBOL_GPL(crypto_engine_alloc_init);
diff --git a/include/crypto/engine.h b/include/crypto/engine.h
index 33a5be2..c64d942 100644
--- a/include/crypto/engine.h
+++ b/include/crypto/engine.h
@@ -36,6 +36,7 @@
* @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
* @kworker: kthread worker struct for request pump
* @pump_requests: work struct for scheduling work to the request pump
* @priv_data: the engine private data
@@ -58,6 +59,8 @@ 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;
@@ -104,6 +107,7 @@ int crypto_engine_start(struct crypto_engine *engine);
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,
+ int (*cbk_do_batch)(struct crypto_engine *engine),
bool rt, int qlen);
int crypto_engine_exit(struct crypto_engine *engine);

--
2.1.0
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