linux-kernel - [PATCH v4 08/17] crypto: sun8i-ce: move iv data to request context

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Message-Id: <1595358391-34525-9-git-send-email-clabbe@baylibre.com>
Date:   Tue, 21 Jul 2020 19:06:22 +0000
From:   Corentin Labbe <clabbe@...libre.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au,
        mripard@...nel.org, wens@...e.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, Corentin Labbe <clabbe@...libre.com>
Subject: [PATCH v4 08/17] crypto: sun8i-ce: move iv data to request context

Instead of storing IV data in the channel context, store them in the
request context.
Storing them in the channel structure was conceptualy wrong since they
are per request related.

Signed-off-by: Corentin Labbe <clabbe@...libre.com>
---
 .../allwinner/sun8i-ce/sun8i-ce-cipher.c      | 27 +++++++++----------
 drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h  | 10 ++++---
 2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
index b4d5fea27d20..2252604d821b 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-cipher.c
@@ -88,7 +88,6 @@ static int sun8i_ce_cipher(struct skcipher_request *areq)
 	struct scatterlist *sg;
 	unsigned int todo, len, offset, ivsize;
 	dma_addr_t addr_iv = 0, addr_key = 0;
-	void *backup_iv = NULL;
 	u32 common, sym;
 	int flow, i;
 	int nr_sgs = 0;
@@ -151,24 +150,24 @@ static int sun8i_ce_cipher(struct skcipher_request *areq)
 
 	ivsize = crypto_skcipher_ivsize(tfm);
 	if (areq->iv && crypto_skcipher_ivsize(tfm) > 0) {
-		chan->ivlen = ivsize;
-		chan->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA);
-		if (!chan->bounce_iv) {
+		rctx->ivlen = ivsize;
+		rctx->bounce_iv = kzalloc(ivsize, GFP_KERNEL | GFP_DMA);
+		if (!rctx->bounce_iv) {
 			err = -ENOMEM;
 			goto theend_key;
 		}
 		if (rctx->op_dir & CE_DECRYPTION) {
-			backup_iv = kzalloc(ivsize, GFP_KERNEL);
-			if (!backup_iv) {
+			rctx->backup_iv = kzalloc(ivsize, GFP_KERNEL);
+			if (!rctx->backup_iv) {
 				err = -ENOMEM;
 				goto theend_key;
 			}
 			offset = areq->cryptlen - ivsize;
-			scatterwalk_map_and_copy(backup_iv, areq->src, offset,
-						 ivsize, 0);
+			scatterwalk_map_and_copy(rctx->backup_iv, areq->src,
+						 offset, ivsize, 0);
 		}
-		memcpy(chan->bounce_iv, areq->iv, ivsize);
-		addr_iv = dma_map_single(ce->dev, chan->bounce_iv, chan->ivlen,
+		memcpy(rctx->bounce_iv, areq->iv, ivsize);
+		addr_iv = dma_map_single(ce->dev, rctx->bounce_iv, rctx->ivlen,
 					 DMA_TO_DEVICE);
 		cet->t_iv = cpu_to_le32(addr_iv);
 		if (dma_mapping_error(ce->dev, addr_iv)) {
@@ -249,17 +248,17 @@ static int sun8i_ce_cipher(struct skcipher_request *areq)
 theend_iv:
 	if (areq->iv && ivsize > 0) {
 		if (addr_iv)
-			dma_unmap_single(ce->dev, addr_iv, chan->ivlen,
+			dma_unmap_single(ce->dev, addr_iv, rctx->ivlen,
 					 DMA_TO_DEVICE);
 		offset = areq->cryptlen - ivsize;
 		if (rctx->op_dir & CE_DECRYPTION) {
-			memcpy(areq->iv, backup_iv, ivsize);
-			kfree_sensitive(backup_iv);
+			memcpy(areq->iv, rctx->backup_iv, ivsize);
+			kfree_sensitive(rctx->backup_iv);
 		} else {
 			scatterwalk_map_and_copy(areq->iv, areq->dst, offset,
 						 ivsize, 0);
 		}
-		kfree(chan->bounce_iv);
+		kfree(rctx->bounce_iv);
 	}
 
 theend_key:
diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h
index 963645fe4adb..f5555c4800e8 100644
--- a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h
+++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce.h
@@ -129,8 +129,6 @@ struct ce_task {
 /*
  * struct sun8i_ce_flow - Information used by each flow
  * @engine:	ptr to the crypto_engine for this flow
- * @bounce_iv:	buffer which contain the IV
- * @ivlen:	size of bounce_iv
  * @complete:	completion for the current task on this flow
  * @status:	set to 1 by interrupt if task is done
  * @t_phy:	Physical address of task
@@ -139,8 +137,6 @@ struct ce_task {
  */
 struct sun8i_ce_flow {
 	struct crypto_engine *engine;
-	void *bounce_iv;
-	unsigned int ivlen;
 	struct completion complete;
 	int status;
 	dma_addr_t t_phy;
@@ -183,11 +179,17 @@ struct sun8i_ce_dev {
  * struct sun8i_cipher_req_ctx - context for a skcipher request
  * @op_dir:		direction (encrypt vs decrypt) for this request
  * @flow:		the flow to use for this request
+ * @backup_iv:		buffer which contain the next IV to store
+ * @bounce_iv:		buffer which contain the IV
+ * @ivlen:		size of bounce_iv
  * @fallback_req:	request struct for invoking the fallback skcipher TFM
  */
 struct sun8i_cipher_req_ctx {
 	u32 op_dir;
 	int flow;
+	void *backup_iv;
+	void *bounce_iv;
+	unsigned int ivlen;
 	struct skcipher_request fallback_req;   // keep at the end
 };
 
-- 
2.26.2