[PATCH v4 1/1] crypto: engine - Permit to enqueue skcipher request

[Corentin Labbe]

The crypto engine could actually only enqueue hash and ablkcipher request.
This patch permit it to enqueue skcipher requests by adding all necessary
functions.

Signed-off-by: Corentin Labbe <clabbe.montjoie@xxxxxxxxx>
---
 crypto/crypto_engine.c  | 120 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/crypto/engine.h |  14 ++++++
 2 files changed, 134 insertions(+)

diff --git a/crypto/crypto_engine.c b/crypto/crypto_engine.c
index 61e7c4e02fd2..d5ee2a615339 100644
--- a/crypto/crypto_engine.c
+++ b/crypto/crypto_engine.c
@@ -36,9 +36,11 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 	struct crypto_async_request *async_req, *backlog;
 	struct ahash_request *hreq;
 	struct ablkcipher_request *breq;
+	struct skcipher_request *skreq;
 	unsigned long flags;
 	bool was_busy = false;
 	int ret, rtype;
+	const struct crypto_type *cratype;
 
 	spin_lock_irqsave(&engine->queue_lock, flags);
 
@@ -123,6 +125,25 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 		}
 		return;
 	case CRYPTO_ALG_TYPE_ABLKCIPHER:
+		cratype = engine->cur_req->tfm->__crt_alg->cra_type;
+		if (cratype != &crypto_ablkcipher_type) {
+			skreq = skcipher_request_cast(engine->cur_req);
+			if (engine->prepare_skcipher_request) {
+				ret = engine->prepare_skcipher_request(engine, skreq);
+				if (ret) {
+					dev_err(engine->dev, "failed to prepare request: %d\n",
+						ret);
+					goto req_err;
+				}
+				engine->cur_req_prepared = true;
+			}
+			ret = engine->skcipher_one_request(engine, skreq);
+			if (ret) {
+				dev_err(engine->dev, "failed to cipher one request from queue\n");
+				goto req_err;
+			}
+			return;
+		}
 		breq = ablkcipher_request_cast(engine->cur_req);
 		if (engine->prepare_cipher_request) {
 			ret = engine->prepare_cipher_request(engine, breq);
@@ -151,6 +172,12 @@ static void crypto_pump_requests(struct crypto_engine *engine,
 		crypto_finalize_hash_request(engine, hreq, ret);
 		break;
 	case CRYPTO_ALG_TYPE_ABLKCIPHER:
+		cratype = engine->cur_req->tfm->__crt_alg->cra_type;
+		if (cratype != &crypto_ablkcipher_type) {
+			skreq = skcipher_request_cast(engine->cur_req);
+			crypto_finalize_skcipher_request(engine, skreq, ret);
+			break;
+		}
 		breq = ablkcipher_request_cast(engine->cur_req);
 		crypto_finalize_cipher_request(engine, breq, ret);
 		break;
@@ -213,6 +240,49 @@ int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine,
 EXPORT_SYMBOL_GPL(crypto_transfer_cipher_request_to_engine);
 
 /**
+ * crypto_transfer_skcipher_request - transfer the new request into the
+ * enginequeue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+int crypto_transfer_skcipher_request(struct crypto_engine *engine,
+				     struct skcipher_request *req,
+				     bool need_pump)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&engine->queue_lock, flags);
+
+	if (!engine->running) {
+		spin_unlock_irqrestore(&engine->queue_lock, flags);
+		return -ESHUTDOWN;
+	}
+
+	ret = crypto_enqueue_request(&engine->queue, &req->base);
+
+	if (!engine->busy && need_pump)
+		kthread_queue_work(engine->kworker, &engine->pump_requests);
+
+	spin_unlock_irqrestore(&engine->queue_lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_skcipher_request);
+
+/**
+ * crypto_transfer_skcipher_request_to_engine - transfer one request to list
+ * into the engine queue
+ * @engine: the hardware engine
+ * @req: the request need to be listed into the engine queue
+ */
+int crypto_transfer_skcipher_request_to_engine(struct crypto_engine *engine,
+					       struct skcipher_request *req)
+{
+	return crypto_transfer_skcipher_request(engine, req, true);
+}
+EXPORT_SYMBOL_GPL(crypto_transfer_skcipher_request_to_engine);
+
+/**
  * crypto_transfer_hash_request - transfer the new request into the
  * enginequeue
  * @engine: the hardware engine
@@ -292,6 +362,43 @@ void crypto_finalize_cipher_request(struct crypto_engine *engine,
 EXPORT_SYMBOL_GPL(crypto_finalize_cipher_request);
 
 /**
+ * crypto_finalize_skcipher_request - finalize one request if the request is done
+ * @engine: the hardware engine
+ * @req: the request need to be finalized
+ * @err: error number
+ */
+void crypto_finalize_skcipher_request(struct crypto_engine *engine,
+				      struct skcipher_request *req, int err)
+{
+	unsigned long flags;
+	bool finalize_cur_req = false;
+	int ret;
+
+	spin_lock_irqsave(&engine->queue_lock, flags);
+	if (engine->cur_req == &req->base)
+		finalize_cur_req = true;
+	spin_unlock_irqrestore(&engine->queue_lock, flags);
+
+	if (finalize_cur_req) {
+		if (engine->cur_req_prepared &&
+		    engine->unprepare_skcipher_request) {
+			ret = engine->unprepare_skcipher_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->base.complete(&req->base, err);
+
+	kthread_queue_work(engine->kworker, &engine->pump_requests);
+}
+EXPORT_SYMBOL_GPL(crypto_finalize_skcipher_request);
+
+/**
  * crypto_finalize_hash_request - finalize one request if the request is done
  * @engine: the hardware engine
  * @req: the request need to be finalized
@@ -345,6 +452,19 @@ int crypto_engine_start(struct crypto_engine *engine)
 		return -EBUSY;
 	}
 
+	if (!engine->skcipher_one_request && !engine->cipher_one_request &&
+	    !engine->hash_one_request) {
+		spin_unlock_irqrestore(&engine->queue_lock, flags);
+		dev_err(engine->dev, "need at least one request type\n");
+		return -EINVAL;
+	}
+
+	if (engine->skcipher_one_request && engine->cipher_one_request) {
+		spin_unlock_irqrestore(&engine->queue_lock, flags);
+		dev_err(engine->dev, "Cannot use both skcipher and ablkcipher\n");
+		return -EINVAL;
+	}
+
 	engine->running = true;
 	spin_unlock_irqrestore(&engine->queue_lock, flags);
 
diff --git a/include/crypto/engine.h b/include/crypto/engine.h
index dd04c1699b51..a8f6e6ed377b 100644
--- a/include/crypto/engine.h
+++ b/include/crypto/engine.h
@@ -18,6 +18,7 @@
 #include <linux/kthread.h>
 #include <crypto/algapi.h>
 #include <crypto/hash.h>
+#include <crypto/skcipher.h>
 
 #define ENGINE_NAME_LEN	30
 /*
@@ -69,12 +70,18 @@ struct crypto_engine {
 				      struct ablkcipher_request *req);
 	int (*unprepare_cipher_request)(struct crypto_engine *engine,
 					struct ablkcipher_request *req);
+	int (*prepare_skcipher_request)(struct crypto_engine *engine,
+					struct skcipher_request *req);
+	int (*unprepare_skcipher_request)(struct crypto_engine *engine,
+					  struct skcipher_request *req);
 	int (*prepare_hash_request)(struct crypto_engine *engine,
 				    struct ahash_request *req);
 	int (*unprepare_hash_request)(struct crypto_engine *engine,
 				      struct ahash_request *req);
 	int (*cipher_one_request)(struct crypto_engine *engine,
 				  struct ablkcipher_request *req);
+	int (*skcipher_one_request)(struct crypto_engine *engine,
+				    struct skcipher_request *req);
 	int (*hash_one_request)(struct crypto_engine *engine,
 				struct ahash_request *req);
 
@@ -90,12 +97,19 @@ int crypto_transfer_cipher_request(struct crypto_engine *engine,
 				   bool need_pump);
 int crypto_transfer_cipher_request_to_engine(struct crypto_engine *engine,
 					     struct ablkcipher_request *req);
+int crypto_transfer_skcipher_request(struct crypto_engine *engine,
+				     struct skcipher_request *req,
+				     bool need_pump);
+int crypto_transfer_skcipher_request_to_engine(struct crypto_engine *engine,
+					       struct skcipher_request *req);
 int crypto_transfer_hash_request(struct crypto_engine *engine,
 				 struct ahash_request *req, bool need_pump);
 int crypto_transfer_hash_request_to_engine(struct crypto_engine *engine,
 					   struct ahash_request *req);
 void crypto_finalize_cipher_request(struct crypto_engine *engine,
 				    struct ablkcipher_request *req, int err);
+void crypto_finalize_skcipher_request(struct crypto_engine *engine,
+				      struct skcipher_request *req, int err);
 void crypto_finalize_hash_request(struct crypto_engine *engine,
 				  struct ahash_request *req, int err);
 int crypto_engine_start(struct crypto_engine *engine);
-- 
2.13.0