> And then the provider updates the mr->rkey field as part of WR processing?

Yeah, I guess so.

Actually thinking about it, another possibility would be to wrap up the

 > newrkey = (mr->rkey & 0xffffff00) | newkey;

operation in a little inline helper function so people don't screw it
up.  Maybe that's the cleanest way to do it.

(We would probably want the helper for low-level driver use anyway)

 - R.
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