[openib-general] [PATCH] IPOIB: Use a GRH when appropriate for unicast packets

[Roland Dreier]

    Jason> Basically, if IB routers are used, and the IPoIB feature of
    Jason> *not* spanning a subnet is used (for scalabililty?) then
    Jason> you need an alternate way to specify addresses to rdma cm.

You mean if the IB router is also an IP router for IPoIB?

Then I think there are some serious semantic problems to solve for the
RDMA CM -- because you are using an IP address to define a
destination, but since that address is on the other side of an IP
router, there's no way to know it even belongs to an IB port.

 - R.