Tagged Queueing and Dque Bit

[Doug Ledford]

On 07-Jan-98 Justin T. Gibbs wrote:
>> After I figured out the Dque bit, and reset it to zero, it worked
>flawlessly
>> with tagged queueing enabled.
>
>> So I would suggest, that the driver should check also the Control Mode
>> Page (if available), and should honor the Dque bit (fall back to not use 
>> tagged queueing if Dque is set).
>
>This is exactly what the CAM layer does.  It may be the case that in Linux
>the individual control drivers have to do this, but it will be messy.  I
>don't think that the Linux aic7xxx driver has any code in it currently
>to queue and handle it's own SCSI commands.

Heh, no.  We currently don't have any code for generating commands like
this, and yes, it's very messy to try and do so.  That's something I would
far rather see added to the mid level SCSI code.

----------------------------------
E-Mail: Doug Ledford <dledford at dialnet.net>
Date: 07-Jan-98
Time: 13:20:30
----------------------------------