From: Jeff Garzik <jgarzik@pobox.com>
To: James.Smart@Emulex.Com
Cc: luben_tuikov@adaptec.com, hch@lst.de, jejb@steeleye.com,
ltuikov@yahoo.com, Eric.Moore@lsil.com, andrew.patterson@hp.com,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH] minimal SAS transport class
Date: Sat, 20 Aug 2005 00:57:38 -0400 [thread overview]
Message-ID: <4306B842.6010708@pobox.com> (raw)
In-Reply-To: <9BB4DECD4CFE6D43AA8EA8D768ED51C21D7A40@xbl3.ma.emulex.com>
James.Smart@Emulex.Com wrote:
> For SAS, looking at Christoph's code -
> The target id comes from the LLDD. So either the LLDD maintains a
> map of SAS port addresses to target ids, or the mapping could change,
> same as FC. Christoph's argument is that FC's issue was historical.
As James and I discussed on IRC, the FC mapping issue will crop up
again, such as with SAS.
A core problem is that the SCSI layer expects to address things on a
host/channel/id/lun basis, when _that_ addressing is largely a legacy
holdover from parallel SCSI.
We need to figure out a way to move SCSI layer addressing forward, and
eliminate any need for hacks such as FC's mapping.
FC's mapping hacks exist because the SCSI layer addressing needs to be
made more flexible.
Unfortunately, as James also pointed out, changing addressing will cause
lots of churn, and potentially some breakage.
Jeff
next prev parent reply other threads:[~2005-08-20 4:57 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-20 4:15 [PATCH] minimal SAS transport class James.Smart
2005-08-20 4:57 ` Jeff Garzik [this message]
2005-08-20 17:23 ` Luben Tuikov
2005-08-21 17:03 ` Christoph Hellwig
2005-08-21 16:52 ` Christoph Hellwig
2005-08-21 18:23 ` Luben Tuikov
2005-08-22 4:55 ` Matt Domsch
2005-08-22 17:05 ` Luben Tuikov
2005-08-22 21:53 ` Mike Anderson
2005-08-23 23:55 ` Luben Tuikov
2005-08-24 17:12 ` Patrick Mansfield
2005-08-24 20:05 ` Luben Tuikov
2005-08-24 20:42 ` Patrick Mansfield
2005-08-24 21:48 ` Luben Tuikov
2005-08-23 11:10 ` Douglas Gilbert
2005-08-23 6:27 ` Hannes Reinecke
2005-08-23 15:42 ` Patrick Mansfield
2005-08-23 15:53 ` Matthew Wilcox
2005-08-24 0:13 ` Luben Tuikov
2005-08-25 19:32 ` Stefan Richter
2005-08-25 20:06 ` Jeff Garzik
2005-08-26 16:43 ` Luben Tuikov
2005-08-26 17:22 ` James Bottomley
2005-08-26 18:16 ` Luben Tuikov
2005-08-26 18:48 ` Jeff Garzik
2005-08-26 19:37 ` Luben Tuikov
2005-08-27 1:39 ` Jeff Garzik
2005-08-27 7:11 ` Stefan Richter
2005-08-28 22:13 ` Luben Tuikov
-- strict thread matches above, loose matches on Subject: below --
2005-08-23 18:25 James.Smart
2005-08-23 16:16 James.Smart
2005-08-23 17:28 ` Stefan Richter
2005-08-24 0:02 ` Luben Tuikov
2005-08-24 9:12 ` Christoph Hellwig
2005-08-26 15:47 ` Luben Tuikov
2005-08-26 19:24 ` Jeff Garzik
2005-08-26 19:44 ` Luben Tuikov
2005-08-27 1:53 ` Jeff Garzik
2005-08-27 7:35 ` Stefan Richter
2005-08-28 22:27 ` Luben Tuikov
2005-08-29 5:16 ` Stefan Richter
2005-08-29 17:11 ` Christoph Hellwig
2005-08-29 17:20 ` Luben Tuikov
2005-08-29 17:25 ` Christoph Hellwig
2005-08-29 17:16 ` Christoph Hellwig
2005-08-29 17:31 ` Luben Tuikov
2005-08-29 18:34 ` Luben Tuikov
2005-08-29 18:09 ` James Bottomley
2005-08-23 17:57 ` Patrick Mansfield
2005-08-22 23:08 Moore, Eric Dean
2005-08-24 8:59 ` Christoph Hellwig
2005-08-18 18:48 James.Smart
2005-08-18 19:04 ` Jeff Garzik
2005-08-19 14:06 ` Christoph Hellwig
2005-08-19 17:51 ` Luben Tuikov
2005-08-19 17:54 ` Christoph Hellwig
2005-08-19 17:56 ` Luben Tuikov
2005-08-19 17:59 ` Christoph Hellwig
2005-08-19 18:07 ` Luben Tuikov
2005-08-19 19:59 ` James Bottomley
2005-08-19 20:32 ` Luben Tuikov
2005-08-19 20:54 ` Jeff Garzik
2005-08-20 9:18 ` Christoph Hellwig
2005-08-20 17:34 ` Luben Tuikov
2005-08-21 6:41 ` Arjan van de Ven
2005-08-21 17:07 ` Christoph Hellwig
2005-08-19 19:08 ` Luben Tuikov
2005-08-18 20:06 ` Luben Tuikov
2005-08-19 14:04 ` Christoph Hellwig
2005-08-18 14:43 James.Smart
2005-08-18 14:02 James.Smart
2005-08-18 17:56 ` Christoph Hellwig
2005-08-18 20:05 ` Luben Tuikov
2005-08-19 14:15 ` Christoph Hellwig
2005-08-18 11:57 James.Smart
2005-08-15 13:55 Christoph Hellwig
2005-08-15 14:19 ` Luben Tuikov
2005-08-15 14:35 ` Arjan van de Ven
2005-08-15 15:04 ` Luben Tuikov
2005-08-15 15:13 ` Luben Tuikov
2005-08-15 15:21 ` Christoph Hellwig
2005-08-15 15:33 ` Luben Tuikov
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