crypto: algif - Mark sgl end at the end of data

algif_skcipher sends 127 sgl buffers for encryption regardless of how
many buffers acctually have data to process, where the few first with
valid len and the rest with zero len. This is not very eficient.
This patch marks the last one with data as the last one to process.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index c12207c8dde9e6b6a5365783f299623e7a221914..38a6757e3cccdbfbff707870e09ad59e153925d3 100644 (file)
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -330,6 +330,7 @@ static int skcipher_sendmsg(struct kiocb *unused, struct socket *sock,
 
                sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
                sg = sgl->sg;
+               sg_unmark_end(sg + sgl->cur);
                do {
                        i = sgl->cur;
                        plen = min_t(int, len, PAGE_SIZE);
@@ -355,6 +356,9 @@ static int skcipher_sendmsg(struct kiocb *unused, struct socket *sock,
                        sgl->cur++;
                } while (len && sgl->cur < MAX_SGL_ENTS);
 
+               if (!size)
+                       sg_mark_end(sg + sgl->cur - 1);
+
                ctx->merge = plen & (PAGE_SIZE - 1);
        }
 
@@ -401,6 +405,10 @@ static ssize_t skcipher_sendpage(struct socket *sock, struct page *page,
        ctx->merge = 0;
        sgl = list_entry(ctx->tsgl.prev, struct skcipher_sg_list, list);
 
+       if (sgl->cur)
+               sg_unmark_end(sgl->sg + sgl->cur - 1);
+
+       sg_mark_end(sgl->sg + sgl->cur);
        get_page(page);
        sg_set_page(sgl->sg + sgl->cur, page, size, offset);
        sgl->cur++;