Re: Fixing the SCSI layer

[Matthew Jacob]

> 
> This still seems backwards. It should be going
> 
> 
>       [ll_rw_blk]     [sg]
>            +-------------+
>                   |
>             Card Driver
>               (calls)
> 
>       [ SCSI Libraries ]
> 
> 
> The card driver should have a library of support routines, not an immovable
> layer of glue above it. For a simple dumb card with the 2.3.17 ll_rw_blk
> scatter/gather features its likely to be doing something conceptually like
> 
> 
>       while((cmd=request_to_scsi(req, ISA_BOUNCE))!=NULL)
>       {
>               [issue command to hardware]
>               add_timer(..) for abort/reset
>       }
> 
> Smarter cards might want to use the queueing in the library, others may not
> but control belongs card level. 
> 

Not necessarily. Scheduling and complicated error recovery is a property
of interactions with the whole system- not one bus.



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