linux-kernel - [v2 PATCH 3/9] crypto: aead - Add ctx helpers with DMA alignment

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Message-Id: <E1oyQS1-000djS-65@formenos.hmeau.com>
Date:   Fri, 25 Nov 2022 12:36:33 +0800
From:   "Herbert Xu" <herbert@...dor.apana.org.au>
To:     Ard Biesheuvel <ardb@...nel.org>, Will Deacon <will@...nel.org>,
        Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: [v2 PATCH 3/9] crypto: aead - Add ctx helpers with DMA alignment

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@...dor.apana.org.au>
---

 include/crypto/internal/aead.h |   22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/crypto/internal/aead.h b/include/crypto/internal/aead.h
index d482017f3e20..cd8cb1e921b7 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 +70,16 @@ 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 = crypto_dma_align();
+
+	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 +123,13 @@ 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)
+{
+	reqsize += crypto_dma_align() & ~(crypto_tfm_ctx_alignment() - 1);
+	aead->reqsize = reqsize;
+}
+
 static inline void aead_init_queue(struct aead_queue *queue,
 				   unsigned int max_qlen)
 {