[PATCH 8/10] crypto mv_cesa : Make the copy-back of data optional

[Uri Simchoni <uri@xxxxxxxxxxxx>]

Make the copy-back of data optional (not done in hashing requests)

Signed-off-by: Uri Simchoni <uri@xxxxxxxxxxxx>
---
diff -upr linux-2.6.32.8_p7/drivers/crypto/mv_cesa.c 
linux-2.6.32.8_p8/drivers/crypto/mv_cesa.c
--- linux-2.6.32.8_p7/drivers/crypto/mv_cesa.c    2010-03-16 
12:07:31.147897717 +0200
+++ linux-2.6.32.8_p8/drivers/crypto/mv_cesa.c    2010-03-16 
12:25:34.815950170 +0200
@@ -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 ab
     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);

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