[ofw] [PATCH] dapl: use private_data_len for mem copies

[Davis, Arlin R]

>>Where do I get the actual private data max value for the 
>rdma_cm protocol?
>
>There isn't any single rdma_cm protocol.  The absolute maximum 
>private data for any connection message is 
>RDMA_MAX_PRIVATE_DATA, which is 256, but the amount available 
>may be less.  There is no minimum value that is guaranteed.  
>The amount returned for a connection event is specified as 
>part of the event.
>

ok, given there is no single protocol and you define different
absolute max values (56 on Windows, 256 on Linux), how
do rdma_cm consumer's authenticate private data capabilities?

-arlin