[openib-general] design for communication established affiliated asynchronous event handling

[Roland Dreier]

>I suggest the following design: the CMA would replace the event handler
>provided with the qp_init_attr struct with a callback of its own and
>keep the original handler/context on a private structure.

This is probably fine.  There is one further situation where the
connection needs to be established, beyond RTU and the communication
established async event.  Namely, if a receive completion is polled.
Since async events are, well, asynchronous, there's no guarantee that
the communication established event will be reported any time soon...