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

[Hal Rosenstock]

On Tue, 2006-08-15 at 15:59, Roland Dreier wrote:
>  > This is what I was referring to.  I'm really not familiar with IP multicast
>  > beyond what I read in a book while coding the RDMA CM.  It sounds like we might
>  > be able to use the QKey as the port number for the QP to mimic the behavior.
> 
> I don't see how this could work-- to mimic IP, an app has to be able
> to multicast a datagram to multiple destination ports using the same
> multicast group.  Since IB multicast groups have a Q_Key associated,
> the only way this could work is if all QPs and MCGs share one Q_Key.

Isn't it all QPs on the same MCG need to share one Q_Key ?

-- Hal

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