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

[Roland Dreier]

 > I've started thinking about what it would take to get the rdma cm to
 > work across a router.  I think the rdma cm may need to treat IPv6
 > addresses as a GID for this to work across subnets, versus trying to
 > map an ipoib IP address to a GID based on ARP.

Hmm, why is that?  Shouldn't IPoIB work through a router, and
correctly get the GID of the final destination via ARP just fine?

If the RDMA CM treats IPv6 addresses as GIDs, then this breaks things
on a normal subnet with IPoIB interfaces configured with IPv6 addresses.

 - R.