Re: Maximum data size in a single transfer for MS driver

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On Thu, 2010-02-18 at 14:16 +0530, Ramya Desai wrote:
> On Wed, Feb 17, 2010 at 8:32 PM, James Bottomley
> <James.Bottomley@xxxxxxx> wrote:
> 
> > I have no idea what the MS driver is, so it's impossible to answer
> > specifically.
> 
> MS means mass storage driver only.

OK, still don't know what that is ... but Randy decoded this for me; he
said you mean a driver under drivers/usb/storage?  

In that case, it looks like the helpers in protocol.c do use chaining
correctly (as long as the driver isn't doing direct dma), but there's a
clamp on the sg table size in scsiglue.c:

.sg_tablesize = SG_ALL

That would have to be changed to SCSI_MAX_SG_CHAIN_SEGMENTS to enable
chaining.

James


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