crypto: nx - add offset to nx_build_sg_lists()

This patch includes one more parameter to nx_build_sg_lists() to skip
the given number of bytes from beginning of each sg list.

This is needed in order to implement the fixes for the AES modes to make
them able to process larger chunks of data.

Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/crypto/nx/nx.c b/drivers/crypto/nx/nx.c
index bdf4990f9758..5533fe31c90d 100644
--- a/drivers/crypto/nx/nx.c
+++ b/drivers/crypto/nx/nx.c
@@ -211,6 +211,8 @@ struct nx_sg *nx_walk_and_build(struct nx_sg       *nx_dst,
  * @dst: destination scatterlist
  * @src: source scatterlist
  * @nbytes: length of data described in the scatterlists
+ * @offset: number of bytes to fast-forward past at the beginning of
+ *          scatterlists.
  * @iv: destination for the iv data, if the algorithm requires it
  *
  * This is common code shared by all the AES algorithms. It uses the block
@@ -222,6 +224,7 @@ int nx_build_sg_lists(struct nx_crypto_ctx  *nx_ctx,
                       struct scatterlist    *dst,
                       struct scatterlist    *src,
                       unsigned int           nbytes,
+                      unsigned int           offset,
                       u8                    *iv)
 {
         struct nx_sg *nx_insg = nx_ctx->in_sg;
@@ -230,8 +233,10 @@ int nx_build_sg_lists(struct nx_crypto_ctx  *nx_ctx,
         if (iv)
                 memcpy(iv, desc->info, AES_BLOCK_SIZE);
 
-        nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen, src, 0, nbytes);
-        nx_outsg = nx_walk_and_build(nx_outsg, nx_ctx->ap->sglen, dst, 0, nbytes);
+        nx_insg = nx_walk_and_build(nx_insg, nx_ctx->ap->sglen, src,
+                                    offset, nbytes);
+        nx_outsg = nx_walk_and_build(nx_outsg, nx_ctx->ap->sglen, dst,
+                                    offset, nbytes);
 
         /* these lengths should be negative, which will indicate to phyp that
          * the input and output parameters are scatterlists, not linear