linux-kernel - Re: [GIT PULL] isci merge candidate

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Message-ID: <1305324962.2781.5.camel@pasglop>
Date:	Sat, 14 May 2011 08:16:02 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"James.Bottomley@...senpartnership.com" 
	<James.Bottomley@...senpartnership.com>,
	Christoph Hellwig <hch@....de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	"Jiang, Dave" <dave.jiang@...el.com>,
	David Milburn <dmilburn@...hat.com>,
	"Ciechanowski, Ed" <ed.ciechanowski@...el.com>,
	"Nadolski, Edmund" <edmund.nadolski@...el.com>,
	"Danecki, Jacek" <jacek.danecki@...el.com>,
	"Skirvin, Jeffrey D" <jeffrey.d.skirvin@...el.com>,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: [GIT PULL] isci merge candidate


> It's a SAS (serial-attached-scsi) driver so it ties in to libsas rather 
> than libata (libsas itself ties in to libata for tunnelling SATA 
> protocol over SAS).  The size is attributable to the fact that all 
> protocol handling for non-fast path i/o is handled by software.  There 
> are still cleanups that can be made, but likely not on the on the same 
> order of what we have already done.

How much of that non-fast-path could/should be in generic code vs. in
the driver specific code ? IE. If somebody comes up with another "dumb"
SAS adapter tomorrow that doesn't do all that magic in an offload CPU,
is any of that code re-usable ?

Cheers,
Ben.

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