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authorHerbert Xu <herbert@gondor.apana.org.au>2008-08-31 07:58:45 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2008-12-25 01:01:20 +0100
commit420a4b20c504e4674bf253601f793bdb254f99fa (patch)
tree574f50a8ac2a5f8abfbbdec1519a47ae837a3381 /virt
parentcrypto: crc32c-intel - Update copyright head (diff)
downloadlinux-420a4b20c504e4674bf253601f793bdb254f99fa.tar.xz
linux-420a4b20c504e4674bf253601f793bdb254f99fa.zip
crypto: padlock - Avoid resetting cword on successive operations
Resetting the control word is quite expensive. Fortunately this isn't an issue for the common operations such as CBC and ECB as the whole operation is done through a single call. However, modes such as LRW and XTS have to call padlock over and over again for one operation which really hurts if each call resets the control word. This patch uses an idea by Sebastian Siewior to store the last control word used on a CPU and only reset the control word if that changes. Note that any task switch automatically resets the control word so we only need to be accurate with regard to the stored control word when no task switches occur. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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