path: root/crypto/scatterwalk.h
diff options
authorHerbert Xu <herbert@gondor.apana.org.au>2005-07-06 13:51:31 -0700
committerDavid S. Miller <davem@davemloft.net>2005-07-06 13:51:31 -0700
commitc774e93e2152d0be2612739418689e6e6400f4eb (patch)
treeabe25ec0577bd95128adb3f38609a09f0a3e2469 /crypto/scatterwalk.h
parent[CRYPTO] Don't check for NULL before kfree() (diff)
[CRYPTO] Add plumbing for multi-block operations
The VIA Padlock device is able to perform much better when multiple blocks are fed to it at once. As this device offers an exceptional throughput rate it is worthwhile to optimise the infrastructure specifically for it. We shift the existing page-sized fast path down to the CBC/ECB functions. We can then replace the CBC/ECB functions with functions provided by the underlying algorithm that performs the multi-block operations. As a side-effect this improves the performance of large cipher operations for all existing algorithm implementations. I've measured the gain to be around 5% for 3DES and 15% for AES. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
1 files changed, 3 insertions, 3 deletions
diff --git a/crypto/scatterwalk.h b/crypto/scatterwalk.h
index 02aa56c649b4..5495bb970816 100644
--- a/crypto/scatterwalk.h
+++ b/crypto/scatterwalk.h
@@ -40,10 +40,10 @@ static inline int scatterwalk_samebuf(struct scatter_walk *walk_in,
walk_in->offset == walk_out->offset;
-static inline int scatterwalk_across_pages(struct scatter_walk *walk,
- unsigned int nbytes)
+static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
+ unsigned int nbytes)
- return nbytes > walk->len_this_page;
+ return nbytes > walk->len_this_page ? walk->len_this_page : nbytes;
static inline void scatterwalk_advance(struct scatter_walk *walk,