Added support for executing multiple requests, in parallel,
for crypto engine based on a retry mechanism.
If hardware was unable to execute a backlog request, enqueue it
back in front of crypto-engine queue, to keep the order
of requests.
A new variable is added, retry_support (this is to keep the
backward compatibility of crypto-engine) , which keeps track
whether the hardware has support for retry mechanism and,
also, if can run multiple requests.
If do_one_request() returns:
>= 0: hardware executed the request successfully;
< 0: this is the old error path. If hardware has support for retry
mechanism, the request is put back in front of crypto-engine queue.
For backwards compatibility, if the retry support is not available,
the crypto-engine will work as before.
Only MAY_BACKLOG requests are enqueued back into
crypto-engine's queue, since the others can be dropped.
The new crypto_engine_alloc_init_and_set function, initializes
crypto-engine, sets the maximum size for crypto-engine software
queue (not hardcoded anymore) and the retry_support variable
is set, by default, to false.
On crypto_pump_requests(), if do_one_request() returns >= 0,
a new request is send to hardware, until there is no space in
hardware and do_one_request() returns < 0.
By default, retry_support is false and crypto-engine will
work as before - will send requests to hardware,
one-by-one, on crypto_pump_requests(), and complete it, on
crypto_finalize_request(), and so on.
To support multiple requests, in each driver, retry_support
must be set on true, and if do_one_request() returns an error
the request must not be freed, since it will be enqueued back
into crypto-engine's queue.
When all drivers, that use crypto-engine now, will be updated for
retry mechanism, the retry_support variable can be removed.
Signed-off-by: Iuliana Prodan <iuliana.prodan@xxxxxxx>
---
crypto/crypto_engine.c | 140 +++++++++++++++++++++++++++++++---------
include/crypto/engine.h | 10 ++-
2 files changed, 118 insertions(+), 32 deletions(-)
diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index eb029ff1e05a..2e2b879d31bb 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -22,32 +22,36 @@
* @err: error number
*/
static void crypto_finalize_request(struct crypto_engine *engine,
- struct crypto_async_request *req, int err)
+ struct crypto_async_request *req, int err)
{
unsigned long flags;
- bool finalize_cur_req = false;
+ bool finalize_req = false;
int ret;
struct crypto_engine_ctx *enginectx;
- spin_lock_irqsave(&engine->queue_lock, flags);
- if (engine->cur_req == req)
- finalize_cur_req = true;
- spin_unlock_irqrestore(&engine->queue_lock, flags);
+ /*
+ * If hardware cannot enqueue more requests
+ * and retry mechanism is not supported
+ * make sure we are completing the current request
+ */
+ if (!engine->retry_support) {
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ if (engine->cur_req == req) {
+ finalize_req = true;
+ engine->cur_req = NULL;
+ }
+ spin_unlock_irqrestore(&engine->queue_lock, flags);
+ }
- if (finalize_cur_req) {
+ if (finalize_req || engine->retry_support) {
enginectx = crypto_tfm_ctx(req->tfm);
- if (engine->cur_req_prepared &&
+ if (enginectx->op.prepare_request &&
enginectx->op.unprepare_request) {
ret = enginectx->op.unprepare_request(engine, req);
if (ret)
dev_err(engine->dev, "failed to unprepare request\n");
}
- spin_lock_irqsave(&engine->queue_lock, flags);
- engine->cur_req = NULL;
- engine->cur_req_prepared = false;
- spin_unlock_irqrestore(&engine->queue_lock, flags);
}
-
req->complete(req, err);
kthread_queue_work(engine->kworker, &engine->pump_requests);
@@ -74,7 +78,7 @@ static void crypto_pump_requests(struct crypto_engine *engine,
spin_lock_irqsave(&engine->queue_lock, flags);
/* Make sure we are not already running a request */
- if (engine->cur_req)
+ if (!engine->retry_support && engine->cur_req)
goto out;
/* If another context is idling then defer */
@@ -108,13 +112,21 @@ static void crypto_pump_requests(struct crypto_engine *engine,
goto out;
}
+start_request:
/* 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;
- engine->cur_req = async_req;
+ /*
+ * If hardware doesn't support the retry mechanism,
+ * keep track of the request we are processing now.
+ * We'll need it on completion (crypto_finalize_request).
+ */
+ if (!engine->retry_support)
+ engine->cur_req = async_req;
+
if (backlog)
backlog->complete(backlog, -EINPROGRESS);
@@ -130,7 +142,7 @@ static void crypto_pump_requests(struct crypto_engine *engine,
ret = engine->prepare_crypt_hardware(engine);
if (ret) {
dev_err(engine->dev, "failed to prepare crypt hardware\n");
- goto req_err;
+ goto req_err_2;
}
}
@@ -141,28 +153,75 @@ static void crypto_pump_requests(struct crypto_engine *engine,
if (ret) {
dev_err(engine->dev, "failed to prepare request: %d\n",
ret);
- goto req_err;
+ goto req_err_2;
}
- engine->cur_req_prepared = true;
}
if (!enginectx->op.do_one_request) {
dev_err(engine->dev, "failed to do request\n");
ret = -EINVAL;
- goto req_err;
+ goto req_err_1;
}
+
ret = enginectx->op.do_one_request(engine, async_req);
- if (ret) {
- dev_err(engine->dev, "Failed to do one request from queue: %d\n", ret);
- goto req_err;
+
+ /* Request unsuccessfully executed by hardware */
+ if (ret < 0) {
+ /* Non-backlog requests can be dropped */
+ if (!engine->retry_support ||
+ !(async_req->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
+ dev_err(engine->dev,
+ "Failed to do one request from queue: %d\n",
+ ret);
+ goto req_err_1;
+ }
+ /*
+ * If retry mechanism is supported,
+ * unprepare current request and
+ * enqueue it back into crypto-engine queue.
+ */
+ if (enginectx->op.unprepare_request) {
+ ret = enginectx->op.unprepare_request(engine,
+ async_req);
+ if (ret)
+ dev_err(engine->dev,
+ "failed to unprepare request\n");
+ }
+
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ /*
+ * If hardware was unable to execute request, enqueue it
+ * back in front of crypto-engine queue, to keep the order
+ * of requests.
+ */
+ crypto_enqueue_request_head(&engine->queue, async_req);
+
+ kthread_queue_work(engine->kworker, &engine->pump_requests);
+ goto out;
}
- return;
-req_err:
- crypto_finalize_request(engine, async_req, ret);
+ goto retry;
+
+req_err_1:
+ if (enginectx->op.unprepare_request) {
+ ret = enginectx->op.unprepare_request(engine, async_req);
+ if (ret)
+ dev_err(engine->dev, "failed to unprepare request\n");
+ }
+
+req_err_2:
+ async_req->complete(async_req, ret);
+
+retry:
+ /* If retry mechanism is supported, send new requests to engine */
+ if (engine->retry_support) {
+ spin_lock_irqsave(&engine->queue_lock, flags);
+ goto start_request;
+ }
return;
out:
spin_unlock_irqrestore(&engine->queue_lock, flags);
+ return;
}
static void crypto_pump_work(struct kthread_work *work)
@@ -386,15 +445,20 @@ int crypto_engine_stop(struct crypto_engine *engine)
EXPORT_SYMBOL_GPL(crypto_engine_stop);
/**
- * crypto_engine_alloc_init - allocate crypto hardware engine structure and
- * initialize it.
+ * crypto_engine_alloc_init_and_set - allocate crypto hardware engine structure
+ * and initialize it by setting the maximum number of entries in the software
+ * crypto-engine queue.
* @dev: the device attached with one hardware engine
+ * @retry_support: whether hardware has support for retry mechanism
* @rt: whether this queue is set to run as a realtime task
+ * @qlen: maximum size of the crypto-engine queue
*
* This must be called from context that can sleep.
* Return: the crypto engine structure on success, else NULL.
*/
-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,
+ bool rt, int qlen)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO / 2 };
struct crypto_engine *engine;
@@ -411,12 +475,12 @@ struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
engine->running = false;
engine->busy = false;
engine->idling = false;
- engine->cur_req_prepared = false;
+ engine->retry_support = retry_support;
engine->priv_data = dev;
snprintf(engine->name, sizeof(engine->name),
"%s-engine", dev_name(dev));
- crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN);
+ crypto_init_queue(&engine->queue, qlen);
spin_lock_init(&engine->queue_lock);
engine->kworker = kthread_create_worker(0, "%s", engine->name);
@@ -433,6 +497,22 @@ struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
return engine;
}
+EXPORT_SYMBOL_GPL(crypto_engine_alloc_init_and_set);
+
+/**
+ * crypto_engine_alloc_init - allocate crypto hardware engine structure and
+ * initialize it.
+ * @dev: the device attached with one hardware engine
+ * @rt: whether this queue is set to run as a realtime task
+ *
+ * This must be called from context that can sleep.
+ * Return: the crypto engine structure on success, else NULL.
+ */
+struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt)
+{
+ return crypto_engine_alloc_init_and_set(dev, false, 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 e29cd67f93c7..b92d7ff1528a 100644
--- a/include/crypto/engine.h
+++ b/include/crypto/engine.h
@@ -24,7 +24,9 @@
* @idling: the engine is entering idle state
* @busy: request pump is busy
* @running: the engine is on working
- * @cur_req_prepared: current request is prepared
+ * @retry_support: indication that the hardware allows re-execution
+ * of a failed backlog request
+ * crypto-engine, in head position to keep order
* @list: link with the global crypto engine list
* @queue_lock: spinlock to syncronise access to request queue
* @queue: the crypto queue of the engine
@@ -45,7 +47,8 @@ struct crypto_engine {
bool idling;
bool busy;
bool running;
- bool cur_req_prepared;
+
+ bool retry_support;
struct list_head list;
spinlock_t queue_lock;
@@ -102,6 +105,9 @@ void crypto_finalize_skcipher_request(struct crypto_engine *engine,
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,
+ bool retry_support,
+ bool rt, int qlen);
int crypto_engine_exit(struct crypto_engine *engine);
#endif /* _CRYPTO_ENGINE_H */
--
2.17.1
