On Thu, 2007-02-22 at 17:18, Sean Hefty wrote: > >>Can someone help my understanding here? Is ipoib joining a multicast group > >>using the full membership PKey, even if the node that it joins from only > >>has the > >>limited membership PKey configured? And the code in ib_find_cached_pkey > >>helps > >>enable this? > > > > Yep. The ipoib create_child function Or-s 0x8000 to the device pkey > > which was provided by the user. Now, IPoIB uses the device pkey when > > forming MGIDs and when doing modify qp to init. Indeed the way > > ib_find_cached_pkey() is implemented, make the latter use trivial. > > Doesn't this allow ipoib to join a multicast group for which it may not be > able > to communicate with all members?
Yes, if the join were to succeed which appears to be to be noncompliant behavior. > For the broadcast group, this seems like an error to me. Why for just the broadcast group ? Isn't it any IPoIB MC group for which this would be done ? (See below as to what the IBA spec says). > Can ipoib work in such a configuration? If all nodes were > assigned a partial membership PKey, none of them could communicate, but no > errors would be generated anywhere. > > Joining a multicast group requires specifying the full membership PKey. I > don't > see anything in the spec that explicitly prohibits joining the group from a > node > with only a partial membership PKey, What about the description og P_Key in MCMemberRecord (table 210 on p. 908 which is compliance) which states: "All members of the multicast group shall have full membership in the partition indicated by the partition key." -- Hal > but at first glance, this seems like a > subnet configuration issue. Is there some use of this I'm overlooking? > > - Sean _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
