crypto: mv_cesa - Make the copy-back of data optional
Make the copy-back of data optional (not done in hashing requests)
Signed-off-by: Uri Simchoni <uri@jdland.co.il>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/mv_cesa.c b/drivers/crypto/mv_cesa.c
index 2b4f07a..49a2206 100644
--- a/drivers/crypto/mv_cesa.c
+++ b/drivers/crypto/mv_cesa.c
@@ -40,6 +40,7 @@
* @src_start: offset to add to src start position (scatter list)
* @crypt_len: length of current crypt process
* @hw_nbytes: total bytes to process in hw for this request
+ * @copy_back: whether to copy data back (crypt) or not (hash)
* @sg_dst_left: bytes left dst to process in this scatter list
* @dst_start: offset to add to dst start position (scatter list)
* @hw_processed_bytes: number of bytes processed by hw (request).
@@ -60,6 +61,7 @@
int crypt_len;
int hw_nbytes;
/* dst mostly */
+ int copy_back;
int sg_dst_left;
int dst_start;
int hw_processed_bytes;
@@ -267,33 +269,35 @@
struct crypto_async_request *req = cpg->cur_req;
void *buf;
int ret;
- int need_copy_len = cpg->p.crypt_len;
- int sram_offset = 0;
-
cpg->p.hw_processed_bytes += cpg->p.crypt_len;
- do {
- int dst_copy;
+ if (cpg->p.copy_back) {
+ int need_copy_len = cpg->p.crypt_len;
+ int sram_offset = 0;
+ do {
+ int dst_copy;
- if (!cpg->p.sg_dst_left) {
- ret = sg_miter_next(&cpg->p.dst_sg_it);
- BUG_ON(!ret);
- cpg->p.sg_dst_left = cpg->p.dst_sg_it.length;
- cpg->p.dst_start = 0;
- }
+ if (!cpg->p.sg_dst_left) {
+ ret = sg_miter_next(&cpg->p.dst_sg_it);
+ BUG_ON(!ret);
+ cpg->p.sg_dst_left = cpg->p.dst_sg_it.length;
+ cpg->p.dst_start = 0;
+ }
- buf = cpg->p.dst_sg_it.addr;
- buf += cpg->p.dst_start;
+ buf = cpg->p.dst_sg_it.addr;
+ buf += cpg->p.dst_start;
- dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
+ dst_copy = min(need_copy_len, cpg->p.sg_dst_left);
- memcpy(buf,
- cpg->sram + SRAM_DATA_OUT_START + sram_offset,
- dst_copy);
- sram_offset += dst_copy;
- cpg->p.sg_dst_left -= dst_copy;
- need_copy_len -= dst_copy;
- cpg->p.dst_start += dst_copy;
- } while (need_copy_len > 0);
+ memcpy(buf,
+ cpg->sram + SRAM_DATA_OUT_START + sram_offset,
+ dst_copy);
+ sram_offset += dst_copy;
+ cpg->p.sg_dst_left -= dst_copy;
+ need_copy_len -= dst_copy;
+ cpg->p.dst_start += dst_copy;
+ } while (need_copy_len > 0);
+ }
+
BUG_ON(cpg->eng_st != ENGINE_W_DEQUEUE);
if (cpg->p.hw_processed_bytes < cpg->p.hw_nbytes) {
@@ -336,6 +340,7 @@
p->hw_nbytes = req->nbytes;
p->complete = mv_crypto_algo_completion;
p->process = mv_process_current_q;
+ p->copy_back = 1;
num_sgs = count_sgs(req->src, req->nbytes);
sg_miter_start(&p->src_sg_it, req->src, num_sgs, SG_MITER_FROM_SG);