[RFC PATCH 1/4] crypto: add CRYPTO_TFM_REQ_DMA flag

[Iuliana Prodan (OSS)]

From: Iuliana Prodan <iuliana.prodan@xxxxxxx>

The CRYPTO_TFM_REQ_DMA flag can be used by backend implementations to
indicate to crypto API the need to allocate GFP_DMA memory
for private contexts of the crypto requests.

For public key encryption add the needed functions to
set/get/clear flags.

Signed-off-by: Horia Geanta <horia.geanta@xxxxxxx>
Signed-off-by: Iuliana Prodan <iuliana.prodan@xxxxxxx>
---
 include/crypto/aead.h     |  4 ++++
 include/crypto/akcipher.h | 21 +++++++++++++++++++++
 include/crypto/hash.h     |  4 ++++
 include/crypto/skcipher.h |  4 ++++
 include/linux/crypto.h    |  1 +
 5 files changed, 34 insertions(+)

diff --git a/include/crypto/aead.h b/include/crypto/aead.h
index fcc12c593ef8..ae2ef87cfb0d 100644
--- a/include/crypto/aead.h
+++ b/include/crypto/aead.h
@@ -416,6 +416,10 @@ static inline struct aead_request *aead_request_alloc(struct crypto_aead *tfm,
 {
 	struct aead_request *req;
 
+	if (crypto_aead_reqsize(tfm) &&
+	    (crypto_aead_get_flags(tfm) & CRYPTO_TFM_REQ_DMA))
+		gfp |= GFP_DMA;
+
 	req = kmalloc(sizeof(*req) + crypto_aead_reqsize(tfm), gfp);
 
 	if (likely(req))
diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
index 1d3aa252caba..c06c140d1b7a 100644
--- a/include/crypto/akcipher.h
+++ b/include/crypto/akcipher.h
@@ -158,6 +158,23 @@ static inline unsigned int crypto_akcipher_reqsize(struct crypto_akcipher *tfm)
 	return crypto_akcipher_alg(tfm)->reqsize;
 }
 
+static inline u32 crypto_akcipher_get_flags(struct crypto_akcipher *tfm)
+{
+	return crypto_tfm_get_flags(crypto_akcipher_tfm(tfm));
+}
+
+static inline void crypto_akcipher_set_flags(struct crypto_akcipher *tfm,
+					     u32 flags)
+{
+	crypto_tfm_set_flags(crypto_akcipher_tfm(tfm), flags);
+}
+
+static inline void crypto_akcipher_clear_flags(struct crypto_akcipher *tfm,
+					       u32 flags)
+{
+	crypto_tfm_clear_flags(crypto_akcipher_tfm(tfm), flags);
+}
+
 static inline void akcipher_request_set_tfm(struct akcipher_request *req,
 					    struct crypto_akcipher *tfm)
 {
@@ -193,6 +210,10 @@ static inline struct akcipher_request *akcipher_request_alloc(
 {
 	struct akcipher_request *req;
 
+	if (crypto_akcipher_reqsize(tfm) &&
+	    (crypto_akcipher_get_flags(tfm) & CRYPTO_TFM_REQ_DMA))
+		gfp |= GFP_DMA;
+
 	req = kmalloc(sizeof(*req) + crypto_akcipher_reqsize(tfm), gfp);
 	if (likely(req))
 		akcipher_request_set_tfm(req, tfm);
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index af2ff31ff619..cb28be54569a 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -599,6 +599,10 @@ static inline struct ahash_request *ahash_request_alloc(
 {
 	struct ahash_request *req;
 
+	if (crypto_ahash_reqsize(tfm) &&
+	    (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_REQ_DMA))
+		gfp |= GFP_DMA;
+
 	req = kmalloc(sizeof(struct ahash_request) +
 		      crypto_ahash_reqsize(tfm), gfp);
 
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index 6a733b171a5d..3c598b56628b 100644
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -493,6 +493,10 @@ static inline struct skcipher_request *skcipher_request_alloc(
 {
 	struct skcipher_request *req;
 
+	if (crypto_skcipher_reqsize(tfm) &&
+	    (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_DMA))
+		gfp |= GFP_DMA;
+
 	req = kmalloc(sizeof(struct skcipher_request) +
 		      crypto_skcipher_reqsize(tfm), gfp);
 
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index ef90e07c9635..87d7f0563c13 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -141,6 +141,7 @@
 #define CRYPTO_TFM_REQ_FORBID_WEAK_KEYS	0x00000100
 #define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
 #define CRYPTO_TFM_REQ_MAY_BACKLOG	0x00000400
+#define CRYPTO_TFM_REQ_DMA			0x00000800
 
 /*
  * Miscellaneous stuff.
-- 
2.17.1