[ofw] address translation

[Sean Hefty]

>There are kernel equivalents for the functions to query the ARP/neighbor
>information, include netioapi.h.  The functions have the same name as in
>usermode, the return value changes to a NTSTATUS value.  Note that these are
>available only in Windows Vista and later versions of the OS.

I'll interpret this as a no, since we care about 2003.

>> Are IPoIB IP addresses assigned to a specific pkey?
>
>IP addresses are assigned to specific IPoIB instances.

And an ipoib instance is...?  per device?  per port?  per pkey per port?  How
does this work with the broadcast group or multicast groups, which do have
pkeys?