Re: [PATCH V7 0/7] crypto: AES CBC multibuffer implementation

[Megha Dey]

On Tue, 2017-07-25 at 19:09 -0700, Megha Dey wrote:
> In this patch series, we introduce AES CBC encryption that is parallelized on
> x86_64 cpu with XMM registers. The multi-buffer technique encrypt 8 data
> streams in parallel with SIMD instructions. Decryption is handled as in the
> existing AESNI Intel CBC implementation which can already parallelize decryption
> even for a single data stream.
> 
> Please see the multi-buffer whitepaper for details of the technique:
> http://www.intel.com/content/www/us/en/communications/communications-ia-multi-buffer-paper.html
> 
> It is important that any driver uses this algorithm properly for scenarios
> where we have many data streams that can fill up the data lanes most of the
> time. It shouldn't be used when only a single data stream is expected mostly.
> Otherwise we may incur extra delays when we have frequent gaps in data lanes,
> causing us to wait till data come in to fill the data lanes before initiating
> encryption.  We may have to wait for flush operations to commence when no new
> data come in after some wait time. However we keep this extra delay to a
> minimum by opportunistically flushing the unfinished jobs if crypto daemon is
> the only active task running on a cpu.
> 
> By using this technique, we saw a throughput increase of up to 5.7x under
> optimal conditions when we have fully loaded encryption jobs filling up all
> the data lanes.

Hi Herbert,

Are there any more issues with this patchset?
> 
> Change Log:
> 
> v7
> 1. Add the CRYPTO_ALG_ASYNC flag to the internal algorithm
> 2. Remove the irq_disabled check
> 
> v6
> 1. Move away from the compat naming scheme and update the names of the inner
>    and outer algorithm
> 2. Move wrapper code around synchronous internal algorithm from simd.c
>    to mcryptd.c
> 
> v5
> 1. Use an async implementation of the inner algorithm instead of sync and use
>    the latest skcipher interface instead of the older blkcipher interface.
>    (we have picked up this work after a while)
> 
> v4
> 1. Make the decrypt path also use ablkcpher walk.
> http://lkml.iu.edu/hypermail/linux/kernel/1512.0/01807.html
> 
> v3
> 1. Use ablkcipher_walk helpers to walk the scatter gather list
> and eliminated needs to modify blkcipher_walk for multibuffer cipher
> 
> v2
> 1. Update cpu feature check to make sure SSE is supported
> 2. Fix up unloading of aes-cbc-mb module to properly free memory
> 
> Megha Dey (7):
>   crypto: Multi-buffer encryption infrastructure support
>   crypto: AES CBC multi-buffer data structures
>   crypto: AES CBC multi-buffer scheduler
>   crypto: AES CBC by8 encryption
>   crypto: AES CBC multi-buffer glue code
>   crypto: AES vectors for AES CBC multibuffer testing
>   crypto: AES CBC multi-buffer tcrypt
> 
>  arch/x86/crypto/Makefile                           |    1 +
>  arch/x86/crypto/aes-cbc-mb/Makefile                |   22 +
>  arch/x86/crypto/aes-cbc-mb/aes_cbc_enc_x8.S        |  775 ++++++++++
>  arch/x86/crypto/aes-cbc-mb/aes_cbc_mb.c            |  720 ++++++++++
>  arch/x86/crypto/aes-cbc-mb/aes_cbc_mb_ctx.h        |   97 ++
>  arch/x86/crypto/aes-cbc-mb/aes_cbc_mb_mgr.h        |  132 ++
>  arch/x86/crypto/aes-cbc-mb/aes_mb_mgr_init.c       |  146 ++
>  arch/x86/crypto/aes-cbc-mb/mb_mgr_datastruct.S     |  271 ++++
>  arch/x86/crypto/aes-cbc-mb/mb_mgr_inorder_x8_asm.S |  223 +++
>  arch/x86/crypto/aes-cbc-mb/mb_mgr_ooo_x8_asm.S     |  417 ++++++
>  arch/x86/crypto/aes-cbc-mb/reg_sizes.S             |  126 ++
>  crypto/Kconfig                                     |   15 +
>  crypto/mcryptd.c                                   |  475 +++++++
>  crypto/tcrypt.c                                    |  259 +++-
>  crypto/testmgr.c                                   |  707 +++++++++
>  crypto/testmgr.h                                   | 1496 ++++++++++++++++++++
>  include/crypto/mcryptd.h                           |   56 +
>  17 files changed, 5936 insertions(+), 2 deletions(-)
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/Makefile
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/aes_cbc_enc_x8.S
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/aes_cbc_mb.c
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/aes_cbc_mb_ctx.h
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/aes_cbc_mb_mgr.h
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/aes_mb_mgr_init.c
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/mb_mgr_datastruct.S
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/mb_mgr_inorder_x8_asm.S
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/mb_mgr_ooo_x8_asm.S
>  create mode 100644 arch/x86/crypto/aes-cbc-mb/reg_sizes.S
>