Fold common code copying MAC to/from a temp. buffer
into an inline function instead of keeping multiple
open coded versions of same.
Signed-off-by: Gilad Ben-Yossef <gi...@benyossef.com>
---
drivers/staging/ccree/ssi_buffer_mgr.c | 89 ++++++++++++++--------------------
1 file changed, 37 insertions(+), 52 deletions(-)
diff --git a/drivers/staging/ccree/ssi_buffer_mgr.c
b/drivers/staging/ccree/ssi_buffer_mgr.c
index b3ca249..48c0b02 100644
--- a/drivers/staging/ccree/ssi_buffer_mgr.c
+++ b/drivers/staging/ccree/ssi_buffer_mgr.c
@@ -65,6 +65,27 @@ struct buffer_array {
};
/**
+ * cc_copy_mac() - Copy MAC to temporary location
+ *
+ * @dev: device object
+ * @req: aead request object
+ * @dir: [IN] copy from/to sgl
+ */
+static inline void cc_copy_mac(struct device *dev, struct aead_request *req,
+ enum ssi_sg_cpy_direct dir)
+{
+ struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
+ struct crypto_aead *tfm = crypto_aead_reqtfm(req);
+ u32 skip = req->assoclen + req->cryptlen;
+
+ if (areq_ctx->is_gcm4543)
+ skip += crypto_aead_ivsize(tfm);
+
+ cc_copy_sg_portion(dev, areq_ctx->backup_mac, req->src,
+ (skip - areq_ctx->req_authsize), skip, dir);
+}
+
+/**
* cc_get_sgl_nents() - Get scatterlist number of entries.
*
* @sg_list: SG list
@@ -670,19 +691,11 @@ void cc_unmap_aead_request(struct device *dev, struct
aead_request *req)
if (drvdata->coherent &&
(areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT) &&
likely(req->src == req->dst)) {
- u32 size_to_skip = req->assoclen;
-
- if (areq_ctx->is_gcm4543)
- size_to_skip += crypto_aead_ivsize(tfm);
- /* copy mac to a temporary location to deal with possible
+ /* copy back mac from temporary location to deal with possible
* data memory overriding that caused by cache coherence
problem.
*/
- cc_copy_sg_portion(dev, areq_ctx->backup_mac, req->src,
- (size_to_skip + req->cryptlen -
- areq_ctx->req_authsize),
- (size_to_skip + req->cryptlen),
- SSI_SG_FROM_BUF);
+ cc_copy_mac(dev, req, SSI_SG_FROM_BUF);
}
}
@@ -918,7 +931,6 @@ static inline int cc_prepare_aead_data_mlli(
enum drv_crypto_direction direct = areq_ctx->gen_ctx.op_type;
unsigned int authsize = areq_ctx->req_authsize;
int rc = 0, icv_nents;
- struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct device *dev = drvdata_to_dev(drvdata);
if (likely(req->src == req->dst)) {
@@ -943,24 +955,14 @@ static inline int cc_prepare_aead_data_mlli(
* MAC verification upon request completion
*/
if (direct == DRV_CRYPTO_DIRECTION_DECRYPT) {
- if (!drvdata->coherent) {
/* In coherent platforms (e.g. ACP)
* already copying ICV for any
* INPLACE-DECRYPT operation, hence
* we must neglect this code.
*/
- u32 skip = req->assoclen;
-
- if (areq_ctx->is_gcm4543)
- skip += crypto_aead_ivsize(tfm);
-
- cc_copy_sg_portion(dev,
- areq_ctx->backup_mac,
- req->src,
- (skip +
req->cryptlen - areq_ctx->req_authsize),
- (skip +
req->cryptlen),
- SSI_SG_TO_BUF);
- }
+ if (!drvdata->coherent)
+ cc_copy_mac(dev, req, SSI_SG_TO_BUF);
+
areq_ctx->icv_virt_addr = areq_ctx->backup_mac;
} else {
areq_ctx->icv_virt_addr = areq_ctx->mac_buf;
@@ -996,22 +998,14 @@ static inline int cc_prepare_aead_data_mlli(
goto prepare_data_mlli_exit;
}
+ /* Backup happens only when ICV is fragmented, ICV
+ * verification is made by CPU compare in order to simplify
+ * MAC verification upon request completion
+ */
if (unlikely(areq_ctx->is_icv_fragmented)) {
- /* Backup happens only when ICV is fragmented, ICV
- * verification is made by CPU compare in order to
simplify
- * MAC verification upon request completion
- */
- u32 size_to_skip = req->assoclen;
-
- if (areq_ctx->is_gcm4543)
- size_to_skip += crypto_aead_ivsize(tfm);
-
- cc_copy_sg_portion(dev, areq_ctx->backup_mac,
- req->src,
- (size_to_skip + req->cryptlen -
areq_ctx->req_authsize),
- (size_to_skip + req->cryptlen),
- SSI_SG_TO_BUF);
+ cc_copy_mac(dev, req, SSI_SG_TO_BUF);
areq_ctx->icv_virt_addr = areq_ctx->backup_mac;
+
} else { /* Contig. ICV */
/*Should hanlde if the sg is not contig.*/
areq_ctx->icv_dma_addr = sg_dma_address(
@@ -1249,22 +1243,13 @@ int cc_map_aead_request(
mlli_params->curr_pool = NULL;
sg_data.num_of_buffers = 0;
+ /* copy mac to a temporary location to deal with possible
+ * data memory overriding that caused by cache coherence problem.
+ */
if (drvdata->coherent &&
(areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_DECRYPT) &&
- likely(req->src == req->dst)) {
- u32 size_to_skip = req->assoclen;
-
- if (is_gcm4543)
- size_to_skip += crypto_aead_ivsize(tfm);
-
- /* copy mac to a temporary location to deal with possible
- * data memory overriding that caused by cache coherence
problem.
- */
- cc_copy_sg_portion(dev, areq_ctx->backup_mac, req->src,
- (size_to_skip + req->cryptlen -
areq_ctx->req_authsize),
- (size_to_skip + req->cryptlen),
- SSI_SG_TO_BUF);
- }
+ likely(req->src == req->dst))
+ cc_copy_mac(dev, req, SSI_SG_TO_BUF);
/* cacluate the size for cipher remove ICV in decrypt*/
areq_ctx->cryptlen = (areq_ctx->gen_ctx.op_type ==
--
2.7.4
