Jack Morgenstein wrote:
In the case multicast loopback, a creation flag is most appropriate, because 
this is really a qp-creation-only issue (the kernel core layer only needs this 
info at QP creation time).

Probably, the least short-term pain (no ABI change) would be to use the last 
reserved create-qp ABI byte for flags, while defining the flags field in 
ibv_qp_init_attr as uint32_t (preparing for more than 8 future flags).
Hi Jack,

Thanks a lot for the detailed feedback, which is very helpful for this work

Or.


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