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authorHerbert Xu <herbert@gondor.apana.org.au>2009-06-25 14:43:48 +0400
committerHerbert Xu <herbert@gondor.apana.org.au>2009-06-25 14:43:48 +0400
commit0b67fb65d1b2ba1396de69112b8b9bc95d8d5feb (patch)
tree0e94ffea1c1c7a42fb36e231472ccab963901355 /crypto
parent435578aeaad5859dda8657e3ed2c1a5bc1e524ec (diff)
downloadlinux-0b67fb65d1b2ba1396de69112b8b9bc95d8d5feb.tar.xz
crypto: skcipher - Change default sync geniv on SMP to eseqiv
As it stands we use chainiv for sync algorithms and eseqiv for async algorithms. However, when there is more than one CPU chainiv forces all processing to be serialised which is usually not what you want. Also, the added overhead of eseqiv isn't that great. Therefore this patch changes the default sync geniv on SMP machines to eseqiv. For the odd situation where the overhead is unacceptable then chainiv is still available as an option. Note that on UP machines chainiv is still preferred over eseqiv for sync algorithms. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/ablkcipher.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/crypto/ablkcipher.c b/crypto/ablkcipher.c
index 43fc8fb9f978..03fb5facf0b4 100644
--- a/crypto/ablkcipher.c
+++ b/crypto/ablkcipher.c
@@ -14,6 +14,7 @@
*/
#include <crypto/internal/skcipher.h>
+#include <linux/cpumask.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
@@ -25,6 +26,8 @@
#include "internal.h"
+static const char *skcipher_default_geniv __read_mostly;
+
static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
unsigned int keylen)
{
@@ -180,7 +183,8 @@ EXPORT_SYMBOL_GPL(crypto_givcipher_type);
const char *crypto_default_geniv(const struct crypto_alg *alg)
{
- return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
+ return alg->cra_flags & CRYPTO_ALG_ASYNC ?
+ "eseqiv" : skcipher_default_geniv;
}
static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
@@ -361,3 +365,17 @@ err:
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
+
+static int __init skcipher_module_init(void)
+{
+ skcipher_default_geniv = num_possible_cpus() > 1 ?
+ "eseqiv" : "chainiv";
+ return 0;
+}
+
+static void skcipher_module_exit(void)
+{
+}
+
+module_init(skcipher_module_init);
+module_exit(skcipher_module_exit);