On 4/17/07, Herbert Xu <[email protected]> wrote:
On Mon, Apr 16, 2007 at 10:37:01AM +0200, Francis Moreau wrote:
>
> BTW, here are figures I got with 2 different versions of the driver
> when using tcrypt module. The second being the result with the
> optimized driver (no key reloading on each block):
>
> normal version:
> test 4 (128 bit key, 8192 byte blocks): 1 operation in 67991 cycles (8192
> bytes)
>
> optimized version:
> test 4 (128 bit key, 8192 byte blocks): 1 operation in 51783 cycles (8192
> bytes)
>
> So the gain is 16000 cycles which seems to worth the change, isn't it ?
Sounds like it would. It would help of course if you posted the patch :)
OK, I tried to cook up something very simple. Since I don't know this
code, please be indulgent when reading the following patch ;)
diff --git a/crypto/api.c b/crypto/api.c
index 55af8bb..f067de8 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -71,6 +71,10 @@ struct crypto_alg *__crypto_alg_lookup(const char
*name, u32 type, u32 mask)
((struct crypto_larval *)q)->mask != mask)
continue;
+ if (alg->cra_flags & CRYPTO_ALG_EXCLUSIVE &&
+ atomic_read(&alg->cra_refcnt) > 0)
+ continue;
+
exact = !strcmp(q->cra_driver_name, name);
fuzzy = !strcmp(q->cra_name, name);
if (!exact && !(fuzzy && q->cra_priority > best))
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 779aa78..278d386 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -41,6 +41,7 @@
#define CRYPTO_ALG_DEAD 0x00000020
#define CRYPTO_ALG_DYING 0x00000040
#define CRYPTO_ALG_ASYNC 0x00000080
+#define CRYPTO_ALG_EXCLUSIVE 0x00000100
/*
* Set this bit if and only if the algorithm requires another algorithm of
--
Francis
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