Re: [PATCH] aic79xx should be able to ignore HostRAID enabled adapters

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Salyzyn, Mark wrote:
Justin Gibbs had provided the community the emd driver, soundly rejected
and never ported to dm because there were features that Justin held dear
in md that do not translate to dm. An unfortunate waste of considerable
resources.

All throughout development, before Justin had written a single line of code, he was told to do things via Device Mapper. All he had to do was open his ears, and no resource waste would have occurred.


Without the timely agenda and cooled temperaments to close the gap, the
solution should be temporarily to support the proprietary HostRAID
driver when the Adapter is in HostRAID mode and we continue to work to
close that gap on dmraid.
[...]
They are plain SCSI HBAs, but are designated as a RAID card rather than
a Host Bus Adapter in the PCI config space when in 'HostRAID' mode. The
fact that is designated in the PCI space should be enough reason *not*
to attach a simplified LLD.

Strongly disagree.

Linux should export the [non-RAID] hardware capabilities, nothing more.

We don't shim for not-in-tree binary-only drivers. A user continues to be free to simply -not use- aic79xx, regardless of this design decision. SATA controllers come with all sorts of class codes: RAID (host/fake raid), SCSI (fake RAID/fake scsi), IDE, Serial ATA.

We ignore that, and just export the hardware. The class code is only a hint that dmraid should be loaded on top of the low-level driver.


Linux is not about performance first, it is about doing it the Linux
way. I believe we can understand that. And in turn, do not consider it
harmful if a group of individuals trying to make a living see a chance
to acquire a competitive edge.

We don't do it "the Linux way" just for NIH's sake. There are strong reasons why we want cross-vendor solutions. There are strong reasons why we don't want every driver to embed a software RAID engine inside it. And there are strong reasons (some legal, not technical) why its best to ignore binary-only, out-of-tree drivers.

	Jeff


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