> Or asked about removing the ib_cm_establish() call from the API.  It was 
 > left as
 > part of the API to avoid breaking the ABI, and still allow users to force
 > connection establishment in case they poll a receive WC before the COMM_EST
 > event occurs.

Changing the in-kernel interface is no big deal, so I don't think that
needs to be considered.  However the second reason seems valid to me.
Without ib_cm_establish() it's not clear what a consumer can do if a
receive is polled before the communication established event.

 - R.

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