[RFC PATCH 3/7] crypto: aead - Add ctx helpers with DMA alignment

Herbert Xu
2022-05-10T11:08:04Z

This patch adds helpers to access the aead 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/aead.h | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)

diff --git a/include/crypto/internal/aead.h b/include/crypto/internal/aead.h
index 27b7b0224ea6f..be225f3f7fdbf 100644
--- a/include/crypto/internal/aead.h
+++ b/include/crypto/internal/aead.h
@@ -39,6 +39,11 @@ static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
return crypto_tfm_ctx(&tfm->base);
}

+static inline void *crypto_aead_ctx_dma(struct crypto_aead *tfm)
+{
+ return crypto_tfm_ctx_dma(&tfm->base);
+}
+
static inline struct crypto_instance *aead_crypto_instance(
struct aead_instance *inst)
{
@@ -65,6 +70,20 @@ static inline void *aead_request_ctx(struct aead_request *req)
return req->__ctx;
}

+static inline void *aead_request_ctx_dma(struct aead_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(aead_request_ctx(req), align);
+}
+
static inline void aead_request_complete(struct aead_request *req, int err)
{
req->base.complete(&req->base, err);
@@ -108,6 +127,15 @@ static inline void crypto_aead_set_reqsize(struct crypto_aead *aead,
aead->reqsize = reqsize;
}

+static inline void crypto_aead_set_reqsize_dma(struct crypto_aead *aead,
+ unsigned int reqsize)
+{
+#ifdef ARCH_DMA_MINALIGN
+ reqsize += ARCH_DMA_MINALIGN & ~(crypto_tfm_ctx_alignment() - 1);
+#endif
+ aead->reqsize = reqsize;
+}
+
static inline void aead_init_queue(struct aead_queue *queue,
unsigned int max_qlen)
{