[openib-general] [cma] the private data length that arrives with the event RDMA_CM_EVENT_CONNECT_REQUEST is false

[Steve Wise]

For iWARP, the private data length is a field in the MPA startup packets
and thus can be passed up to the consumer in connect request events and
connect reply events.




On Mon, 2006-09-25 at 17:36 +0300, Dotan Barak wrote:
> Roland Dreier wrote:
> >     Dotan> The problem is that the private_data_len in the second side
> >     Dotan> (receiver) is not equal to the sent data (length).
> >
> > How do you expect the private data length to be passed from one side
> > to the other?  There is no such field in the CM protocol.
> >
> > The only thing the RDMA CM can do is pass the maximum possible private
> > data length to the passive consumer.
> >
> >  - R.
> >   
> You are right, the CM should support only private data (according to the 
> IB spec chapter 12).
> The CMA implementation in the gen2 have the attribute private_data_len 
> in the rdma_cm_event structure.
> 
> So, what is the purpose of private_data_len (in the event structure)?
> 
> thanks
> Dotan
> 
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