crypto: acomp - add driver-side scomp interface

Add a synchronous back-end (scomp) to acomp. This allows to easily
expose the already present compression algorithms in LKCF via acomp.

Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 15 insertions, 27 deletions

diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index 14c70d887160..e328b52425a8 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -42,9 +42,18 @@ struct acomp_req {
  * struct crypto_acomp - user-instantiated objects which encapsulate
  * algorithms and core processing logic
  *
- * @base:	Common crypto API algorithm data structure
+ * @compress:		Function performs a compress operation
+ * @decompress:		Function performs a de-compress operation
+ * @dst_free:		Frees destination buffer if allocated inside the
+ *			algorithm
+ * @reqsize:		Context size for (de)compression requests
+ * @base:		Common crypto API algorithm data structure
  */
 struct crypto_acomp {
+	int (*compress)(struct acomp_req *req);
+	int (*decompress)(struct acomp_req *req);
+	void (*dst_free)(struct scatterlist *dst);
+	unsigned int reqsize;
 	struct crypto_tfm base;
 };
 
@@ -125,7 +134,7 @@ static inline struct acomp_alg *crypto_acomp_alg(struct crypto_acomp *tfm)
 
 static inline unsigned int crypto_acomp_reqsize(struct crypto_acomp *tfm)
 {
-	return crypto_acomp_alg(tfm)->reqsize;
+	return tfm->reqsize;
 }
 
 static inline void acomp_request_set_tfm(struct acomp_req *req,
@@ -165,16 +174,7 @@ static inline int crypto_has_acomp(const char *alg_name, u32 type, u32 mask)
  *
  * Return:	allocated handle in case of success or NULL in case of an error
  */
-static inline struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm)
-{
-	struct acomp_req *req;
-
-	req = kzalloc(sizeof(*req) + crypto_acomp_reqsize(tfm), GFP_KERNEL);
-	if (likely(req))
-		acomp_request_set_tfm(req, tfm);
-
-	return req;
-}
+struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm);
 
 /**
  * acomp_request_free() -- zeroize and free asynchronous (de)compression
@@ -183,17 +183,7 @@ static inline struct acomp_req *acomp_request_alloc(struct crypto_acomp *tfm)
  *
  * @req:	request to free
  */
-static inline void acomp_request_free(struct acomp_req *req)
-{
-	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
-	struct acomp_alg *alg = crypto_acomp_alg(tfm);
-
-	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
-		alg->dst_free(req->dst);
-		req->dst = NULL;
-	}
-	kzfree(req);
-}
+void acomp_request_free(struct acomp_req *req);
 
 /**
  * acomp_request_set_callback() -- Sets an asynchronous callback
@@ -256,9 +246,8 @@ static inline void acomp_request_set_params(struct acomp_req *req,
 static inline int crypto_acomp_compress(struct acomp_req *req)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
-	struct acomp_alg *alg = crypto_acomp_alg(tfm);
 
-	return alg->compress(req);
+	return tfm->compress(req);
 }
 
 /**
@@ -273,9 +262,8 @@ static inline int crypto_acomp_compress(struct acomp_req *req)
 static inline int crypto_acomp_decompress(struct acomp_req *req)
 {
 	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
-	struct acomp_alg *alg = crypto_acomp_alg(tfm);
 
-	return alg->decompress(req);
+	return tfm->decompress(req);
 }
 
 #endif