[ofa-general] peer to peer connections support

[Or Gerlitz]

Hi Sean,

I wonder what will it take to implement peer to peer connection 
establishment support in the IB CM (and RDMA-CM, ofcourse). Also do you 
expect any API changes needed in order to support that?

Reading through section 12.10.4, I was not sure to fully understand the 
following: "The ServiceID implicitly defines whether the service is 
client/server or peer to peer, but the application must inform the CM so 
that the CM will handle the inbound REQ correctly."

Such support would be useful in symmetric schemes such as MPIs that open 
connections on demand and more applications where each party can both 
accept and initiate connections. For example, I understand that some 
work is done now at the open mpi community to use the rdma-cm as a 
possible channel for connection establishment.

Or.