Re: [Xen-devel] Re: Help please: bug#625 SCSI disk conflicts with blkfront---best approach for fix?

[Randy Thelen <rthelen@xxxxxxxxxx>]

Dan Smith wrote:

> Is there another benefit to having a low-level SCSI driver that I'm
> missing?~
For my own purposes, I'm planning on building a SCSI generic front- 
end/back-end driver pair to make SCSI disks available to domU's.   
This driver would be available to the Xen community.
Since I'm not running Linux on the front-end, I hadn't thought much  
about the major device number problem.  Instead, I've got an O/S that  
generates SCSI requests and I didn't want to have to work very hard  
to try to translate them to blk requests: SES commands, test unit  
ready, serial number requests, etc.  In addition, our O/S uses  
scatter/gather lists extensively and I'd like to pass those along  
instead of buffering and copying data.
I figured I'd just rely on the SCSI generic driver to send my already- 
generated requests over the SCSI adapter to the devices on the bus.
Since I've never written a Xen driver before, my basic premise was to  
begin with a basic front-end talking to a back-end and adding  
functional components one at a time.  And, documenting my work for  
others to read.  Or, is there already good documentation somewhere on  
designing/building a front-end/back-end driver pair?
-- Randy

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