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Fixing NX data alignment with nx_sg list

PATCH In review Leonidas S. Barbosa 2 participants 2 messages Apr 23, 2015 – Apr 26, 2015

Subsystems (3)
PowerPC Crypto API IBM Power in-Nest Crypto Acceleration
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Leonidas S. Barbosa

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#0 lore raw

PATCH 1/2 Fixing NX data alignment with nx_sg list

In NX we need to pass always a 16 multiple size nx_sg_list to co processor. Trim function handle with this assuring all nx_sg_lists are 16 multiple size, although data was not being considerated when crop was done. It was causing an unalignment between size of the list and data, corrupting csbcpb fields returning a -23 H_ST_PARM error, or invalid operation.

This patch fix this recalculating how much data should be put back in to_process variable what assures the size of sg_list will be correct with size of the data.

Signed-off-by Leonidas S. Barbosa <[email protected]>
---
 drivers/crypto/nx/nx.c |   28 ++++++++++++++++++++++++----
 1 files changed, 24 insertions(+), 4 deletions(-)
drivers/crypto/nx/nx.c +24 -4
index 1da6dc5..3e8a50c 100644
@@ -215,8 +215,15 @@ struct nx_sg *nx_walk_and_build(struct nx_sg       *nx_dst,
  * @delta:  is the amount we need to crop in order to bound the list.
  *
  */
-static long int trim_sg_list(struct nx_sg *sg, struct nx_sg *end, unsigned int delta)
+static long int trim_sg_list(struct nx_sg *sg,
+			     struct nx_sg *end,
+ 			     unsigned int delta,
+			     unsigned int *nbytes)
 {
+	long int oplen;
+	long int data_back;
+	unsigned int is_delta = delta;
+
 	while (delta && end > sg) {
 		struct nx_sg *last = end - 1;
 

@@ -228,7 +235,20 @@ static long int trim_sg_list(struct nx_sg *sg, struct nx_sg *end, unsigned int d
 			delta -= last->len;
 		}
 	}
-	return (sg - end) * sizeof(struct nx_sg);
+
+	/* There are cases where we need to crop list in order to make it
+ 	 * a block size multiple, but we also need to align data. In order to
+ 	 * that we need to calculate how much we need to put back to be
+ 	 * processed
+ 	 */
+	oplen = (sg - end) * sizeof(struct nx_sg);
+	if (is_delta) {
+		data_back = (abs(oplen) / AES_BLOCK_SIZE) *  sg->len;
+		data_back = *nbytes - (data_back & ~(AES_BLOCK_SIZE - 1));
+		*nbytes -= data_back;
+	}
+
+	return oplen;
 }
 
 /**

@@ -330,8 +350,8 @@ int nx_build_sg_lists(struct nx_crypto_ctx  *nx_ctx,
 	/* these lengths should be negative, which will indicate to phyp that
 	 * the input and output parameters are scatterlists, not linear
 	 * buffers */
-	nx_ctx->op.inlen = trim_sg_list(nx_ctx->in_sg, nx_insg, delta);
-	nx_ctx->op.outlen = trim_sg_list(nx_ctx->out_sg, nx_outsg, delta);
+	nx_ctx->op.inlen = trim_sg_list(nx_ctx->in_sg, nx_insg, delta, nbytes);
+	nx_ctx->op.outlen = trim_sg_list(nx_ctx->out_sg, nx_outsg, delta, nbytes);
 
 	return 0;
 }

--
1.7.1

maintainer
#1 lore raw
Quoted 7 lines · Leonidas S. Barbosa

In NX we need to pass always a 16 multiple size nx_sg_list to co processor. Trim function handle with this assuring all nx_sg_lists are 16 multiple size, although data was not being considerated when crop was done. It was causing an unalignment between size of the list and data, corrupting csbcpb fields returning a -23 H_ST_PARM error, or invalid operation.

Quoted 5 lines

This patch fix this recalculating how much data should be put back in to_process variable what assures the size of sg_list will be correct with size of the data.

Signed-off-by Leonidas S. Barbosa <[email protected]>

Both patches applied.

Signature · 3 lines
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt