linux-kernel - Re: [PATCH] driver: char: bfin_crc: CRC hardware accelerator driver for BF60x family processors.

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Date:	Thu, 17 May 2012 06:40:54 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Zhang, Sonic" <Sonic.Zhang@...log.com>
Cc:	Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>,
	"uclinux-dist-devel@...ckfin.uclinux.org" 
	<uclinux-dist-devel@...ckfin.uclinux.org>
Subject: Re: [PATCH] driver: char: bfin_crc: CRC hardware accelerator driver
 for BF60x family processors.

On Thu, May 17, 2012 at 06:55:36AM -0400, Zhang, Sonic wrote:
> Hi Greg,
> 
> >-----Original Message-----
> >From: Greg Kroah-Hartman [mailto:gregkh@...uxfoundation.org]
> >Sent: Wednesday, May 16, 2012 8:13 PM
> >To: Zhang, Sonic
> >Cc: Arnd Bergmann; LKML; uclinux-dist-devel@...ckfin.uclinux.org
> >Subject: Re: [PATCH] driver: char: bfin_crc: CRC hardware accelerator driver for
> >BF60x family processors.
> >
> >On Wed, May 16, 2012 at 04:26:07PM +0800, sonic.zhang@...log.com wrote:
> >> From: Sonic Zhang <sonic.zhang@...log.com>
> >>
> >> The CRC peripheral is a hardware block used to compute the CRC of the block
> >> of data. This is based on a CRC32 engine which computes the CRC value of 32b
> >> data words presented to it. For data words of < 32b in size, it is the
> >> responsibility of the application to pack the data into 32b data units.
> >>
> >> This driver defines data strcture crc_info and 4 IOCTL interfaces for applciations.
> >> 1) CRC Memory Scan
> >> 2) CRC Memory Transfer
> >> 3) CRC Data Verify
> >> 4) CRC Data Fill
> >>
> >> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
> >> ---
> >>  drivers/char/Kconfig    |    8 +
> >>  drivers/char/Makefile   |    1 +
> >>  drivers/char/bfin_crc.c |  537
> >+++++++++++++++++++++++++++++++++++++++++++++++
> >>  3 files changed, 546 insertions(+), 0 deletions(-)
> >>  create mode 100644 drivers/char/bfin_crc.c
> >
> >Why is this a char driver, and not a crypto driver, using the existing
> >crypto userspace api for things like this?
> >
> 
> It looks only the CRC memory scan mode can be implemented as a crypto
> ahash driver. The other 3 functions are not supported in the crypto
> framework.  I will post a crypto driver for the CRC memory scan mode
> later.

Then why not extend the crypto framework to handle these 3 other
functions?

greg k-h
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