RSS hashing with UDP multicast

I am working on an application which receives a limited number (up to 8) high bandwidth (1-3Gb) UDP multicast streams on Windows.

How can I use RSS to distribute the receive load over the cores of my machine?

I guess I need to change the hashing used for the RSS? Is this possible from user space? Of only in a kernel driver?

Is there documentation/example code available on how to do this?

Thanks,

Tom