[openib-general] CM stale connection collision.

[Roland Dreier]

    Libor> I've been seeing some stale connection collisions, as a
    Libor> result of one of my test hosts being rebooted much more
    Libor> frequently then the other.

It might not hurt to make this harder to hit by randomizing the
starting ID that's used.  One simple way to implement this would be to
pick a random 32-bit mask when the module is loaded and XOR that with
the index that comes from the idr.  (And then mask it back off when
looking up in the idr, of course)

 - R.