[ewg] [PATCH 6/8 v3] IB/ipoib: restrict IPoIB to work on IB ports only

[Woodruff, Robert J]

Eli Cohen wrote, 

>We don't want IPoIB to work over RDMAoE since it will give worse performance
>than working directly on Ethernet interfaces which are a prerequisite to RDMAoE
>anyway.

This is another reason why NOT to try to add IBxOE under the IB
transport, but rather add it as it's own transport type. We should not 
need to hack all the InfiniBand ULPs to now have to know the
difference between real IB and IBxOE.