Re: Alternate ways to do Scatter-Gather from BOT Class driver

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On Tue, Jun 29, 2010 at 12:25 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Mon, 28 Jun 2010, Subs wrote:
>
>> Hi All,
>>
>> In my class driver I am receiving data transfer buffer as number of
>> Scatter-Gather lists from SCSI layer to perform data transfers.
>>
>> Is there any alternate way to get the transfer buffer from SCSI other
>> than SG. I wanted to receive the complete data transfer buffer as a
>> single pointer.
>
> As far as I know, there is no alternate way to get the transfer buffer
> from the SCSI layer.
>
> However you can get the effect you want by setting the sg_tablesize
> field in your scsi_host_template to 1.
>
> Just out of curiosity, why are you writing a class driver for the BOT
> class?  Aren't the two existing drivers in the kernel good enough?
>
> Alan Stern
>
>

By changing sg_tablesize to 1, there is no change in number of buffers
that I am receiving in SG list.


> Just out of curiosity, why are you writing a class driver for the BOT
> class?  Aren't the two existing drivers in the kernel good enough?

I am writing my custom class driver, which can do Control and Bulk
transfers only. This is nowhere related to Mass Storage BOT transfers.

Regards,
Subs
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