[openib-general] [Fwd: RE: IB mcast question]

[Steve Wise]

> > According to the spec, C10-15 sez the qkey in the outgoing packet will
> > be the qkey from the QP context IF the high order bit of the qkey is
> > set.  If the high order bit is _not_ set, then the outgoing packet will
> > contain the qkey from the WR. (why? why?)
> 
> The high order bit is for controlled QKeys which are only supposed to be
> sent by "privileged" consumers (e.g. MAD layer for QP1 handing).

I see.

> Also, the C10-15 requirement does not speak to additional requirements
> on the Q_Keys themselves like the one I cited to Sean in a previous
> email in terms of multicast group addressing requirements.
> 
> > Now, in my experiment, my mcast qkey was 0xe00a0a0a
> 
> I don't think that should be allowed from user space.
> 

Ah. So rdma cm needs to not use these special qkeys...