[RFC PATCH 5/7] crypto: skcipher - Add ctx helpers with DMA alignment

Herbert Xu
2022-05-10T11:07:44Z

This patch adds helpers to access the skcipher context structure and
request context structure with an added alignment for DMA access.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

include/crypto/internal/skcipher.h | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index a2339f80a6159..719822e42dc46 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -122,6 +122,15 @@ static inline void crypto_skcipher_set_reqsize(
skcipher->reqsize = reqsize;
}

+static inline void crypto_skcipher_set_reqsize_dma(
+ struct crypto_skcipher *skcipher, unsigned int reqsize)
+{
+#ifdef ARCH_DMA_MINALIGN
+ reqsize += ARCH_DMA_MINALIGN & ~(crypto_tfm_ctx_alignment() - 1);
+#endif
+ skcipher->reqsize = reqsize;
+}
+
int crypto_register_skcipher(struct skcipher_alg *alg);
void crypto_unregister_skcipher(struct skcipher_alg *alg);
int crypto_register_skciphers(struct skcipher_alg *algs, int count);
@@ -151,11 +160,30 @@ static inline void *crypto_skcipher_ctx(struct crypto_skcipher *tfm)
return crypto_tfm_ctx(&tfm->base);
}

+static inline void *crypto_skcipher_ctx_dma(struct crypto_skcipher *tfm)
+{
+ return crypto_tfm_ctx_dma(&tfm->base);
+}
+
static inline void *skcipher_request_ctx(struct skcipher_request *req)
{
return req->__ctx;
}

+static inline void *skcipher_request_ctx_dma(struct skcipher_request *req)
+{
+ unsigned int align = 1;
+
+#ifdef ARCH_DMA_MINALIGN
+ align = ARCH_DMA_MINALIGN;
+#endif
+
+ if (align <= crypto_tfm_ctx_alignment())
+ align = 1;
+
+ return PTR_ALIGN(skcipher_request_ctx(req), align);
+}
+
static inline u32 skcipher_request_flags(struct skcipher_request *req)
{
return req->base.flags;