Date:   Tue, 14 Jan 2020 14:59:31 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     alexandre.torgue@...com, davem@...emloft.net,
        herbert@...dor.apana.org.au, mcoquelin.stm32@...il.com,
        mripard@...nel.org, wens@...e.org, iuliana.prodan@....com,
        horia.geanta@....com, aymen.sghaier@....com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-sunxi@...glegroups.com,
        Corentin Labbe <clabbe.montjoie@...il.com>
Subject: [PATCH RFC 05/10] crypto: engine: transform cur_req in an array

For having the ability of doing a batch of request in one do_one_request(), we
should be able to store them in an array. (for unpreparing them later).
This patch converts cur_req in an array of request, but for the moment
hardcode the maximum to 1.

Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
---
 crypto/crypto_engine.c  | 32 ++++++++++++++++++--------------
 include/crypto/engine.h | 19 +++++++++++++++----
 2 files changed, 33 insertions(+), 18 deletions(-)

diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index eb029ff1e05a..b72873550587 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -30,26 +30,27 @@ static void crypto_finalize_request(struct crypto_engine *engine,
 	struct crypto_engine_ctx *enginectx;
 
 	spin_lock_irqsave(&engine->queue_lock, flags);
-	if (engine->cur_req == req)
+	if (engine->cur_reqs[0].req == req)
 		finalize_cur_req = true;
 	spin_unlock_irqrestore(&engine->queue_lock, flags);
 
 	if (finalize_cur_req) {
-		enginectx = crypto_tfm_ctx(req->tfm);
-		if (engine->cur_req_prepared &&
+		enginectx = crypto_tfm_ctx(engine->cur_reqs[0].req->tfm);
+		if (engine->cur_reqs[0].prepared &&
 		    enginectx->op.unprepare_request) {
-			ret = enginectx->op.unprepare_request(engine, req);
+			ret = enginectx->op.unprepare_request(engine, engine->cur_reqs[0].req);
 			if (ret)
 				dev_err(engine->dev, "failed to unprepare request\n");
 		}
+		engine->cur_reqs[0].req->complete(engine->cur_reqs[0].req, err);
 		spin_lock_irqsave(&engine->queue_lock, flags);
-		engine->cur_req = NULL;
-		engine->cur_req_prepared = false;
+		engine->cur_reqs[0].prepared = false;
+		engine->cur_reqs[0].req = NULL;
 		spin_unlock_irqrestore(&engine->queue_lock, flags);
+	} else {
+		req->complete(req, err);
 	}
 
-	req->complete(req, err);
-
 	kthread_queue_work(engine->kworker, &engine->pump_requests);
 }
 
@@ -74,7 +75,7 @@ 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->cur_reqs[0].req)
 		goto out;
 
 	/* If another context is idling then defer */
@@ -114,7 +115,7 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 	if (!async_req)
 		goto out;
 
-	engine->cur_req = async_req;
+	engine->cur_reqs[0].req = async_req;
 	if (backlog)
 		backlog->complete(backlog, -EINPROGRESS);
 
@@ -143,14 +144,14 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 				ret);
 			goto req_err;
 		}
-		engine->cur_req_prepared = true;
+		engine->cur_reqs[0].prepared = true;
 	}
 	if (!enginectx->op.do_one_request) {
 		dev_err(engine->dev, "failed to do request\n");
 		ret = -EINVAL;
 		goto req_err;
 	}
-	ret = enginectx->op.do_one_request(engine, async_req);
+	ret = enginectx->op.do_one_request(engine, engine->cur_reqs[0].req);
 	if (ret) {
 		dev_err(engine->dev, "Failed to do one request from queue: %d\n", ret);
 		goto req_err;
@@ -158,7 +159,7 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 	return;
 
 req_err:
-	crypto_finalize_request(engine, async_req, ret);
+	crypto_finalize_request(engine, engine->cur_reqs[0].req, ret);
 	return;
 
 out:
@@ -411,10 +412,13 @@ 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->priv_data = dev;
 	snprintf(engine->name, sizeof(engine->name),
 		 "%s-engine", dev_name(dev));
+	engine->rmax = 1;
+	engine->cur_reqs = devm_kzalloc(dev, sizeof(struct cur_req) * engine->rmax, GFP_KERNEL);
+	if (!engine->cur_reqs)
+		return NULL;
 
 	crypto_init_queue(&engine->queue, CRYPTO_ENGINE_MAX_QLEN);
 	spin_lock_init(&engine->queue_lock);
diff --git a/include/crypto/engine.h b/include/crypto/engine.h
index e29cd67f93c7..362134e226f4 100644
--- a/include/crypto/engine.h
+++ b/include/crypto/engine.h
@@ -18,13 +18,23 @@
 #include <crypto/skcipher.h>
 
 #define ENGINE_NAME_LEN	30
+
+/*
+ * struct cur_req - Represent a request to be processed
+ * @prepared:	Does the request was prepared
+ * @req:	The request to be processed
+ */
+struct cur_req {
+	bool				prepared;
+	struct crypto_async_request	*req;
+};
+
 /*
  * struct crypto_engine - crypto hardware engine
  * @name: the engine name
  * @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
  * @list: link with the global crypto engine list
  * @queue_lock: spinlock to syncronise access to request queue
  * @queue: the crypto queue of the engine
@@ -38,14 +48,14 @@
  * @kworker: kthread worker struct for request pump
  * @pump_requests: work struct for scheduling work to the request pump
  * @priv_data: the engine private data
- * @cur_req: the current request which is on processing
+ * @rmax:	The number of request which can be processed in one batch
+ * @cur_reqs: 	A list for requests to be processed
  */
 struct crypto_engine {
 	char			name[ENGINE_NAME_LEN];
 	bool			idling;
 	bool			busy;
 	bool			running;
-	bool			cur_req_prepared;
 
 	struct list_head	list;
 	spinlock_t		queue_lock;
@@ -61,7 +71,8 @@ struct crypto_engine {
 	struct kthread_work             pump_requests;
 
 	void				*priv_data;
-	struct crypto_async_request	*cur_req;
+	int 				rmax;
+	struct cur_req 			*cur_reqs;
 };
 
 /*
-- 
2.24.1

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