You may want to take a look at the ST protocol project
http://oss.sgi.com/projects/stp
and see if it addresses any/some of your needs.
For example - it will give you direct dma to/from user
space over GbE (or any other interface you want to
support in a similar fashion)
thanks,
:a
van Grootheest wrote:
>
> All,
>
> I'm pretty new to writing a device driver for Linux, so I come to you
> and hope to get some tips, pointers and such.
>
> I've been contracted to write a driver for a high speed data aquisition
> interface. High-speed, in this case, means that it will (almost)
> saturate half of the PCI bus (I don't know the exact data rate for this
> application, but the interface has a advertised 130Mbyte/s maximum
> throughput) with incoming data. The data is supposed to go out on an
> gigabyte ethernet card, using the second half of the PCI bandwidth.
> Sometimes the direction will be reversed, but not very often and (as far
> as I understand) not so very-high-speed.
> The interface is a bus-mastering PCI thing, currently for a 33Mhz, 32bit
> bus. The technical req. are that it has to be a zero-copy driver and the
> interface will use DMA to deliver the data. So I'm faced with writing a
> driver that can do DMA to directly to userland.
>
> The PCI device is already in the pci.h file, so it'll be recognized. For
> the actual application specific hardware there is quite some example
> code/driver available. So that part is mostly covered.
>
> So, the basic question is, what does a zero-copy driver look like in
> Linux? Any comments/suggestions are welcome!
> The more mundane questions (interrupt routine, communication between
> driver/user, etc.) I'll simply copy/paste from existing drivers.
>
> Thanks,
> Jan Evert van Grootheest
>
> PS: normally my emails get signed. I've seen that nobody uses that
> around here. If it bothers you, or is considered as bad practice here,
> please let me know.
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