linux-kernel - Re: [RFC] UASP on target

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Message-ID: <20111205091109.GG9900@legolas.emea.dhcp.ti.com>
Date:	Mon, 5 Dec 2011 11:11:10 +0200
From:	Felipe Balbi <balbi@...com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	balbi@...com, Shimrit Malichi <smalichi@...eaurora.org>,
	Tatyana Brokhman <tlinder@...eaurora.org>,
	"open list:USB GADGET/PERIPH..." <linux-usb@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>,
	target-devel@...r.kernel.org
Subject: Re: [RFC] UASP on target

On Mon, Dec 05, 2011 at 09:55:13AM +0100, Sebastian Andrzej Siewior wrote:
> On 12/05/2011 09:39 AM, Felipe Balbi wrote:
> >Hi,
> Hi,
> 
> >On Mon, Dec 05, 2011 at 09:23:26AM +0100, Sebastian Andrzej Siewior wrote:
> >>* Sebastian Andrzej Siewior | 2011-12-05 09:20:47 [+0100]:
> >>
> >>>* Shimrit Malichi | 2011-12-04 21:53:09 [+0200]:
> >>>
> >>>>This patch implements the infrastructure for the UAS gadget driver.
> >>>>The UAS gadget driver registers as a second configuration of the MS
> >>>>gadet driver.
> >>>hch said to use target framework and you haven't done so. This is what I
> >>>have so far. It is not yet complete. What I need to do is:
> >>>- wire up command processing (currently here)
> >>>- wire up data processing
> >>>- check it works =>  post v1
> >>>- wire up command tagging =>  v2
> >>>- remove hard codings and fix whatever people complained about.
> >
> >This is much better, indeed, but the way it is now, it's only usable by
> >the gadget framework because you have put the function driver on the
> >transport layer. I wonder if there wouldn't be a simple way to split the
> >"SCSI Over USB" part in a more generic way which could be shared between
> >gadget side UASP and host side UASP drivers ?!? Maybe ?!?
> >
> >The drivers/target/uasp_*.c would really be just a transport layer and
> >gadget/host drivers would make calls to that "library" ? Something like
> >that ??
> 
> There is very little code that is not host specific. For instance
> uas_alloc_cmd_urb() is something that could be used on both side but
> the host is boxing the command and I need to unbox it. So I don't see
> how I could share things except for the defines.
> Most of the things are usb specific. So UAS gets the commands from the
> scsi framework, puts the usb layer around it and sends them.

k, fair enough ;-) Just thought there'd be a better way to share this
code with host side implementation. Nevermind then

-- 
balbi

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