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

[Hal Rosenstock]

On Tue, 2006-08-15 at 17:49, Steve Wise wrote:
> > > 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...

Yes, that's what I think.

-- Hal

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