Re: [RFC PATCH v4] IV Generation algorithms for dm-crypt

On Tue, Feb 7, 2017 at 12:35 PM, Binoy Jayan [off-list ref] wrote:

===============================================================================
dm-crypt optimization for larger block sizes
===============================================================================

Currently, the iv generation algorithms are implemented in dm-crypt.c. The goal
is to move these algorithms from the dm layer to the kernel crypto layer by
implementing them as template ciphers so they can be used in relation with
algorithms like aes, and with multiple modes like cbc, ecb etc. As part of this
patchset, the iv-generation code is moved from the dm layer to the crypto layer
and adapt the dm-layer to send a whole 'bio' (as defined in the block layer)
at a time. Each bio contains the in memory representation of physically
contiguous disk blocks. Since the bio itself may not be contiguous in main
memory, the dm layer sets up a chained scatterlist of these blocks split into
physically contiguous segments in memory so that DMA can be performed.

...

Binoy Jayan (1):
  crypto: Add IV generation algorithms

 drivers/md/dm-crypt.c  | 1894 ++++++++++++++++++++++++++++++++++--------------
 include/crypto/geniv.h |   47 ++
 2 files changed, 1402 insertions(+), 539 deletions(-)
 create mode 100644 include/crypto/geniv.h

Ran Bonnie++ on it last night  (Luks mode, plain64, Qemu Virt platform
Arm64) and it works just fine.

Tested-by: Gilad Ben-Yossef <gilad@benyossef.com>

Gilad

-- 
Gilad Ben-Yossef
Chief Coffee Drinker

"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
 -- Jean-Baptiste Queru