[openib-general] IB mcast question

[Roland Dreier]

    Steve> I was able to create a mcast group with the mc
    Steve> qkey==0xe00a0a0a, and 3 apps joined this group, but their
    Steve> qp qkeys were 0 (I changed ucma_init_ud_qp() to set the qp
    Steve> qkey to 0).  One app sent to the mcgroup ah/qkey/qpn and
    Steve> the other two received the packet.  Does that make sense?

In theory the Q_Key of a multicast group record is the Q_Key you're
supposed to use when sending to the group.  Of course nothing enforces
this but I don't really like abusing things this way.

 - R.