[ofw] [RFC] getting an RDMA driver interface

[Sean Hefty]

>Does anyone see any issues with this approach or have other comments?  It
>appears that there would at least need to be a mechanism for an RDMA device to
>invoke different callbacks in order to handle multiple drivers above it.
>(Alternatively, a verb filter driver could do this, something like a much, much
>simpler version of IBAL that only dealt with verb calls directly.)

Giving this a second look, at least for WinVerbs the callbacks aren't needed.
Basic notifications can be done using IOCTLs.

- Sean