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>

1 files changed, 27 insertions, 22 deletions

diff --git a/drivers/crypto/mv_cesa.c b/drivers/crypto/mv_cesa.c
index 2b4f07aa89e8..49a22060fb51 100644
--- a/drivers/crypto/mv_cesa.c
+++ b/drivers/crypto/mv_cesa.c
@@ -40,6 +40,7 @@ enum engine_status {
  * @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 @@ struct req_progress {
         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 @@ static void dequeue_complete_req(void)
         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 @@ static void mv_enqueue_new_req(struct ablkcipher_request *req)
         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);