Re: I request inclusion of SAS Transport Layer and AIC-94xx intothe kernel

[Luben Tuikov]

On 09/30/05 20:33, Jeff Garzik wrote:
> Luben Tuikov wrote:
> 
>>But none of the ideas: 64 bit LUN, HCIL removal, etc.,
>>were accepted with "submit a patch".
> 
> 
> I concede this may have been the response in the past.  Its not, now.
> 
> 
> 
> 
>>>So you're saying fixing the current SCSI subsystem once *now* costs  
>>>more than applying all *future* SCSI fixes to _two_ SCSI subsystems,  
>>>handling bug reports for _two_ SCSI subsystems, etc.
>>
>>
>>I'm saying that the current "old" one is already obsolete,
>>when all you have is a SAS chip on your mainboard.
>>
>>All you need is a small, tiny, fast, slim SCSI Core.
> 
> 
> Then don't use it at all.  Write a block driver, if you really feel we 
> need two SCSI cores.
> 
> 
> 
>>Politics: "Nah, whatever you say, specs are *crap* and we'll
>>do it our way.  We are not interested in your way, even if it
>>were better.  Oh, and BTW, REQUEST SENSE clears ACA and LUN
>>is a u64."
> 
> 
> This is a misrepresentation.  -We- understand the stuff you have posted.
> 
> But you continue to demonstrate that you simply do not understand the 
> existing SCSI core code.
> 
> The SAS transport class supports commonality across all SAS 
> implementations.  This includes both MPT and Adaptec 94xx.
> 
> SAS transport class + libsas supports software implementations of SAS, 
> including transport layer management.  This includes Adaptec 94xx but 
> NOT MPT.

You almost get it right, other than the layering infrastructure.

The SAS Transport Layer is a layer in its own right.  It is not
a "libsas".

MPT and open transport a very different, one hides the transport,
i.e. the transport layer is in firmware; the other exposes it
and needs a transport layer. See the pictures here:
http://marc.theaimsgroup.com/?l=linux-kernel&m=112810649712793&w=2

	Luben


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