crypto: chelsio - Update IV before sending request to HW

CBC Decryption requires Last Block as IV. In case src/dst buffer
are same last block will be replaced by plain text. This patch copies
the Last Block before sending request to HW.

Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
index bc70f4f..002e0c2 100644 (file)
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -854,6 +854,13 @@ static struct sk_buff *create_cipher_wr(struct cipher_wr_param *wrparam)
                    transhdr_len, temp,
                        ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC);
        reqctx->skb = skb;
+
+       if (reqctx->op && (ablkctx->ciph_mode ==
+                          CHCR_SCMD_CIPHER_MODE_AES_CBC))
+               sg_pcopy_to_buffer(wrparam->req->src,
+                       sg_nents(wrparam->req->src), wrparam->req->info, 16,
+                       reqctx->processed + wrparam->bytes - AES_BLOCK_SIZE);
+
        return skb;
 err:
        return ERR_PTR(error);
@@ -1077,9 +1084,8 @@ static int chcr_update_cipher_iv(struct ablkcipher_request *req,
                ret = chcr_update_tweak(req, iv, 0);
        else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
                if (reqctx->op)
-                       sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
-                                          16,
-                                          reqctx->processed - AES_BLOCK_SIZE);
+                       /*Updated before sending last WR*/
+                       memcpy(iv, req->info, AES_BLOCK_SIZE);
                else
                        memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
        }
@@ -1107,11 +1113,8 @@ static int chcr_final_cipher_iv(struct ablkcipher_request *req,
        else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
                ret = chcr_update_tweak(req, iv, 1);
        else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
-               if (reqctx->op)
-                       sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
-                                          16,
-                                          reqctx->processed - AES_BLOCK_SIZE);
-               else
+               /*Already updated for Decrypt*/
+               if (!reqctx->op)
                        memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
 
        }