> > So... has anyone thought about what it would take for Linux to support a
> > single URB with multiple scatter-gather elements?
> >
> > AFAIK, an URB needs a single continuous memory block for a transfer. It
> > would be nice if we could use scatter-gather instead.
> >
> > Any thoughts?
Shouldn't request queuing be able to solve that problem? Just
create one URB per s/g segment (e.g. from the SCSI layer),
queue, and be done. It's just a question of which level you
do the s/g at ... I'd rather keep it out of usbcore, that's quite
complex enough as it is!!
> Scatter-gather with chunks of multiples of endpoint size wouldn't be a
> problem for UHCI.
>
> OHCI I imagine would need some work but it should be done.
Should be no different. Though the "multiples of endpoint size"
restriction seems unnecessary to me ... "short packet" handling for
each of a series of URBs should work transparently. The HCDs
already have the infrastructure to do that.
- Dave
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