crypto: vmx - Increase priority of aes-cbc cipher

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commit 12d3f49e1f upstream.

All of the VMX AES ciphers (AES, AES-CBC and AES-CTR) are set at
priority 1000. Unfortunately this means we never use AES-CBC and
AES-CTR, because the base AES-CBC cipher that is implemented on
top of AES inherits its priority.

To fix this, AES-CBC and AES-CTR have to be a higher priority. Set
them to 2000.

Testing on a POWER8 with:

cryptsetup benchmark --cipher aes --key-size 256

Shows decryption speed increase from 402.4 MB/s to 3069.2 MB/s,
over 7x faster. Thanks to Mike Strosaker for helping me debug
this issue.

Fixes: 8c755ace35 ("crypto: vmx - Adding CBC routines for VMX module")
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Anton Blanchard 2016-06-10 16:47:03 +10:00 • committed by Greg Kroah-Hartman

parent eda8951310

commit f6d06f1de8

2 changed files with 2 additions and 2 deletions

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2

drivers/crypto/vmx/aes_cbc.c

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2

drivers/crypto/vmx/aes_ctr.c

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