linux-kernel - Re: [PATCH] Broadcom 8603 SAS/SATA driver, rough draft

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Message-ID: <46F6E1C2.20905@torque.net>
Date:	Sun, 23 Sep 2007 17:59:30 -0400
From:	Douglas Gilbert <dougg@...que.net>
To:	Jeff Garzik <jeff@...zik.org>
CC:	linux-scsi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Broadcom 8603 SAS/SATA driver, rough draft

Jeff Garzik wrote:
> Rather than sitting on this for far too long, I wanted to go ahead and
> get this out there.  I heard some chips might be trickling out into
> public hands.
> 
> This is a bare bones Broadcom 8603 SAS+SATA driver, attempting to use
> the vaunted libsas.  Notes:
> 
> * A quick glance at the FIXMEs will tell you obviously doesn't work.
> 
> * The hardware is quite simple and straightforward and easy to program
>   in an efficient way:  each SAS port has a command queue (DMA ring) and
>   a response queue (DMA ring).  Or if in SATA mode, just a command
>   queue.
> 
> * The SAS/SATA negotiation is largely out of our hands.  The silicon
>   does its thing, and then tells us what type of device connected.  We
>   are then expected to switch the port to either SAS mode or SATA mode,
>   accordingly.
> 
> * There is no firmware or anything.  Just DMA and register bitbanging.
>   We have plenty of low-level control.
> 
> * The state of SAS/SATA integration is perpetually pathetic.  Updates
>   in this area are likely.  There's a rumor Brian King @ IBM may look
>   into this area too.
> 
> * This driver pretty much completely lacks exception handling.
> 
> 
> As an aside, I am also writing a driver for Marvell chips that behave
> quite similarly to this chip.  It seems the future of storage might look
> like these Broadcom and Marvell SAS+SATA DMA ring interfaces, in the
> volume marketspace at least.

Jeff,
Is the lack of SMP support a driver limitation or is it
the silicon?

How about support for wide ports (i.e. when 2 or more HBA
phys are attached to remote phys which have the same SAS
addresses)?

Last question: can the chip run in SCSI target mode?

Doug Gilbert
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