All of lore.kernel.org
 help / color / mirror / Atom feed
From: Gary R Hook <gary.hook@amd.com>
To: <linux-crypto@vger.kernel.org>
Cc: <thomas.lendacky@amd.com>, <herbert@gondor.apana.org.au>,
	<davem@davemloft.net>
Subject: [PATCH v2 3/3] crypto: ccp - Simplify some buffer management routines
Date: Thu, 9 Feb 2017 15:50:08 -0600	[thread overview]
Message-ID: <20170209215008.11781.28483.stgit@taos> (raw)
In-Reply-To: <20170209214704.11781.28640.stgit@taos>

The reverse-get/set functions can be simplified by
eliminating unused code.


Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/crypto/ccp/ccp-ops.c |  142 +++++++++++++++++-------------------------
 1 file changed, 56 insertions(+), 86 deletions(-)

diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index 50fae44..efac3d5 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -184,62 +184,46 @@ static void ccp_get_dm_area(struct ccp_dm_workarea *wa, unsigned int wa_offset,
 }
 
 static int ccp_reverse_set_dm_area(struct ccp_dm_workarea *wa,
+				   unsigned int wa_offset,
 				   struct scatterlist *sg,
-				   unsigned int len, unsigned int se_len,
-				   bool sign_extend)
+				   unsigned int sg_offset,
+				   unsigned int len)
 {
-	unsigned int nbytes, sg_offset, dm_offset, sb_len, i;
-	u8 buffer[CCP_REVERSE_BUF_SIZE];
-
-	if (WARN_ON(se_len > sizeof(buffer)))
-		return -EINVAL;
-
-	sg_offset = len;
-	dm_offset = 0;
-	nbytes = len;
-	while (nbytes) {
-		sb_len = min_t(unsigned int, nbytes, se_len);
-		sg_offset -= sb_len;
-
-		scatterwalk_map_and_copy(buffer, sg, sg_offset, sb_len, 0);
-		for (i = 0; i < sb_len; i++)
-			wa->address[dm_offset + i] = buffer[sb_len - i - 1];
-
-		dm_offset += sb_len;
-		nbytes -= sb_len;
-
-		if ((sb_len != se_len) && sign_extend) {
-			/* Must sign-extend to nearest sign-extend length */
-			if (wa->address[dm_offset - 1] & 0x80)
-				memset(wa->address + dm_offset, 0xff,
-				       se_len - sb_len);
-		}
+	u8 *p, *q;
+
+	ccp_set_dm_area(wa, wa_offset, sg, sg_offset, len);
+
+	p = wa->address + wa_offset;
+	q = p + len - 1;
+	while (p < q) {
+		*p = *p ^ *q;
+		*q = *p ^ *q;
+		*p = *p ^ *q;
+		p++;
+		q--;
 	}
-
 	return 0;
 }
 
 static void ccp_reverse_get_dm_area(struct ccp_dm_workarea *wa,
+				    unsigned int wa_offset,
 				    struct scatterlist *sg,
+				    unsigned int sg_offset,
 				    unsigned int len)
 {
-	unsigned int nbytes, sg_offset, dm_offset, sb_len, i;
-	u8 buffer[CCP_REVERSE_BUF_SIZE];
-
-	sg_offset = 0;
-	dm_offset = len;
-	nbytes = len;
-	while (nbytes) {
-		sb_len = min_t(unsigned int, nbytes, sizeof(buffer));
-		dm_offset -= sb_len;
-
-		for (i = 0; i < sb_len; i++)
-			buffer[sb_len - i - 1] = wa->address[dm_offset + i];
-		scatterwalk_map_and_copy(buffer, sg, sg_offset, sb_len, 1);
-
-		sg_offset += sb_len;
-		nbytes -= sb_len;
+	u8 *p, *q;
+
+	p = wa->address + wa_offset;
+	q = p + len - 1;
+	while (p < q) {
+		*p = *p ^ *q;
+		*q = *p ^ *q;
+		*p = *p ^ *q;
+		p++;
+		q--;
 	}
+
+	ccp_get_dm_area(wa, wa_offset, sg, sg_offset, len);
 }
 
 static void ccp_free_data(struct ccp_data *data, struct ccp_cmd_queue *cmd_q)
@@ -1261,8 +1245,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	if (ret)
 		goto e_sb;
 
-	ret = ccp_reverse_set_dm_area(&exp, rsa->exp, rsa->exp_len,
-				      CCP_SB_BYTES, false);
+	ret = ccp_reverse_set_dm_area(&exp, 0, rsa->exp, 0, rsa->exp_len);
 	if (ret)
 		goto e_exp;
 	ret = ccp_copy_to_sb(cmd_q, &exp, op.jobid, op.sb_key,
@@ -1280,16 +1263,12 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	if (ret)
 		goto e_exp;
 
-	ret = ccp_reverse_set_dm_area(&src, rsa->mod, rsa->mod_len,
-				      CCP_SB_BYTES, false);
+	ret = ccp_reverse_set_dm_area(&src, 0, rsa->mod, 0, rsa->mod_len);
 	if (ret)
 		goto e_src;
-	src.address += o_len;	/* Adjust the address for the copy operation */
-	ret = ccp_reverse_set_dm_area(&src, rsa->src, rsa->src_len,
-				      CCP_SB_BYTES, false);
+	ret = ccp_reverse_set_dm_area(&src, o_len, rsa->src, 0, rsa->src_len);
 	if (ret)
 		goto e_src;
-	src.address -= o_len;	/* Reset the address to original value */
 
 	/* Prepare the output area for the operation */
 	ret = ccp_init_data(&dst, cmd_q, rsa->dst, rsa->mod_len,
@@ -1314,7 +1293,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 		goto e_dst;
 	}
 
-	ccp_reverse_get_dm_area(&dst.dm_wa, rsa->dst, rsa->mod_len);
+	ccp_reverse_get_dm_area(&dst.dm_wa, 0, rsa->dst, 0, rsa->mod_len);
 
 e_dst:
 	ccp_free_data(&dst, cmd_q);
@@ -1566,25 +1545,22 @@ static int ccp_run_ecc_mm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	save = src.address;
 
 	/* Copy the ECC modulus */
-	ret = ccp_reverse_set_dm_area(&src, ecc->mod, ecc->mod_len,
-				      CCP_ECC_OPERAND_SIZE, false);
+	ret = ccp_reverse_set_dm_area(&src, 0, ecc->mod, 0, ecc->mod_len);
 	if (ret)
 		goto e_src;
 	src.address += CCP_ECC_OPERAND_SIZE;
 
 	/* Copy the first operand */
-	ret = ccp_reverse_set_dm_area(&src, ecc->u.mm.operand_1,
-				      ecc->u.mm.operand_1_len,
-				      CCP_ECC_OPERAND_SIZE, false);
+	ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.mm.operand_1, 0,
+				      ecc->u.mm.operand_1_len);
 	if (ret)
 		goto e_src;
 	src.address += CCP_ECC_OPERAND_SIZE;
 
 	if (ecc->function != CCP_ECC_FUNCTION_MINV_384BIT) {
 		/* Copy the second operand */
-		ret = ccp_reverse_set_dm_area(&src, ecc->u.mm.operand_2,
-					      ecc->u.mm.operand_2_len,
-					      CCP_ECC_OPERAND_SIZE, false);
+		ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.mm.operand_2, 0,
+					      ecc->u.mm.operand_2_len);
 		if (ret)
 			goto e_src;
 		src.address += CCP_ECC_OPERAND_SIZE;
@@ -1623,7 +1599,8 @@ static int ccp_run_ecc_mm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	}
 
 	/* Save the ECC result */
-	ccp_reverse_get_dm_area(&dst, ecc->u.mm.result, CCP_ECC_MODULUS_BYTES);
+	ccp_reverse_get_dm_area(&dst, 0, ecc->u.mm.result, 0,
+				CCP_ECC_MODULUS_BYTES);
 
 e_dst:
 	ccp_dm_free(&dst);
@@ -1691,22 +1668,19 @@ static int ccp_run_ecc_pm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	save = src.address;
 
 	/* Copy the ECC modulus */
-	ret = ccp_reverse_set_dm_area(&src, ecc->mod, ecc->mod_len,
-				      CCP_ECC_OPERAND_SIZE, false);
+	ret = ccp_reverse_set_dm_area(&src, 0, ecc->mod, 0, ecc->mod_len);
 	if (ret)
 		goto e_src;
 	src.address += CCP_ECC_OPERAND_SIZE;
 
 	/* Copy the first point X and Y coordinate */
-	ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_1.x,
-				      ecc->u.pm.point_1.x_len,
-				      CCP_ECC_OPERAND_SIZE, false);
+	ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.pm.point_1.x, 0,
+				      ecc->u.pm.point_1.x_len);
 	if (ret)
 		goto e_src;
 	src.address += CCP_ECC_OPERAND_SIZE;
-	ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_1.y,
-				      ecc->u.pm.point_1.y_len,
-				      CCP_ECC_OPERAND_SIZE, false);
+	ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.pm.point_1.y, 0,
+				      ecc->u.pm.point_1.y_len);
 	if (ret)
 		goto e_src;
 	src.address += CCP_ECC_OPERAND_SIZE;
@@ -1717,15 +1691,13 @@ static int ccp_run_ecc_pm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 
 	if (ecc->function == CCP_ECC_FUNCTION_PADD_384BIT) {
 		/* Copy the second point X and Y coordinate */
-		ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_2.x,
-					      ecc->u.pm.point_2.x_len,
-					      CCP_ECC_OPERAND_SIZE, false);
+		ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.pm.point_2.x, 0,
+					      ecc->u.pm.point_2.x_len);
 		if (ret)
 			goto e_src;
 		src.address += CCP_ECC_OPERAND_SIZE;
-		ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_2.y,
-					      ecc->u.pm.point_2.y_len,
-					      CCP_ECC_OPERAND_SIZE, false);
+		ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.pm.point_2.y, 0,
+					      ecc->u.pm.point_2.y_len);
 		if (ret)
 			goto e_src;
 		src.address += CCP_ECC_OPERAND_SIZE;
@@ -1735,19 +1707,17 @@ static int ccp_run_ecc_pm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 		src.address += CCP_ECC_OPERAND_SIZE;
 	} else {
 		/* Copy the Domain "a" parameter */
-		ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.domain_a,
-					      ecc->u.pm.domain_a_len,
-					      CCP_ECC_OPERAND_SIZE, false);
+		ret = ccp_reverse_set_dm_area(&src, 0, ecc->u.pm.domain_a, 0,
+					      ecc->u.pm.domain_a_len);
 		if (ret)
 			goto e_src;
 		src.address += CCP_ECC_OPERAND_SIZE;
 
 		if (ecc->function == CCP_ECC_FUNCTION_PMUL_384BIT) {
 			/* Copy the scalar value */
-			ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.scalar,
-						      ecc->u.pm.scalar_len,
-						      CCP_ECC_OPERAND_SIZE,
-						      false);
+			ret = ccp_reverse_set_dm_area(&src, 0,
+						      ecc->u.pm.scalar, 0,
+						      ecc->u.pm.scalar_len);
 			if (ret)
 				goto e_src;
 			src.address += CCP_ECC_OPERAND_SIZE;
@@ -1792,10 +1762,10 @@ static int ccp_run_ecc_pm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	save = dst.address;
 
 	/* Save the ECC result X and Y coordinates */
-	ccp_reverse_get_dm_area(&dst, ecc->u.pm.result.x,
+	ccp_reverse_get_dm_area(&dst, 0, ecc->u.pm.result.x, 0,
 				CCP_ECC_MODULUS_BYTES);
 	dst.address += CCP_ECC_OUTPUT_SIZE;
-	ccp_reverse_get_dm_area(&dst, ecc->u.pm.result.y,
+	ccp_reverse_get_dm_area(&dst, 0, ecc->u.pm.result.y, 0,
 				CCP_ECC_MODULUS_BYTES);
 	dst.address += CCP_ECC_OUTPUT_SIZE;
 

  parent reply	other threads:[~2017-02-09 21:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-09 21:49 [PATCH v2 0/3] Minor CCP improvements and clean-up Gary R Hook
2017-02-09 21:49 ` [PATCH v2 1/3] crypto: ccp - Change mode for detailed CCP init messages Gary R Hook
2017-02-09 21:49 ` [PATCH v2 2/3] crypto: ccp - Update the command queue on errors Gary R Hook
2017-02-09 21:50 ` Gary R Hook [this message]
2017-02-15  5:33 ` [PATCH v2 0/3] Minor CCP improvements and clean-up Herbert Xu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20170209215008.11781.28483.stgit@taos \
    --to=gary.hook@amd.com \
    --cc=davem@davemloft.net \
    --cc=herbert@gondor.apana.org.au \
    --cc=linux-crypto@vger.kernel.org \
    --cc=thomas.lendacky@amd.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.