Exchange Date Userspace<->Kernel

[Danilo Reinhardt <Danilo.Reinhardt@xxxxxxxxxxxx>]

Hi,

I want to develop a driver that exchanges/modifies data between 2
devices. Now I try to find out whats the best way to do this. 

I think there are 2 ways to do it, the first by doing all work inside
the driver, and the secondy by passing the data from the driver to an
userspace programm which handles and forwards the data to the second
device. 

Whats the fastest way to exchange data between the kernel and a
userspace process and how fast is it?

And on the other side, whats the best way to exchange data inside the
kernel between 2 devices (which are handled by the same driver!).

Thanks for all replies!

Bye Dan



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