On Tue, 2007-01-09 at 13:06, Sean Hefty wrote: > > My thought re this was that since the rest of the original patch > > sequence specifically the rdma_cm UDP and ucma code are merged in > > 2.6.20-rcX which is the code OFED 1.2 is based on, the easy path for you > > would be to stage the multicast code for upstream push to 2.6.21 and > > then push the code as to OFED 1.2, what do you think? > > I think shooting for 2.6.21 is fine, but... > > > Other then that, as we discussed in SC06 there are some changes that > > need to be integrated in the code to allow for interoperability between > > a multicast rdma cm based app to IPoIB, specifically removing the RDMA > > CM signature from the mgid which generated from the ip addr and pkey, > > but not only. > > ...I have not completed these changes yet. Specifically, I have not added a > send only join parameter or changed the qkey. > > I have also not full examined an issue where the SM log fills up with bad > multicast join requests.
Are these send only joins ? If so, it is because the group does not yet exist (you need a receiver first or it to be precreated). The later is problematic for dynamic IPmc groups. > > The second change is related to the qkey, looking in the current code > > of cma_join_ib_multicast() (at the multicast-sa_cache branch of the > > rdma-dev git) i see that the qkey is the mc ip address, which is not > > consistent with what librdmacm is assuming (0x1234567 etc). > > This is a bug in the kernel code. It should be using the standard qkey of > 0x12345678 - for now anyway. Where does this standard qkey come from ? (I missed it). -- Hal > > Anyway, what we need here is to plug into the scheme of ipoib which uses > > the qkey associated with the ipv4 broadcast multicast group. It turns > > out that there is some twilight zone here which i am working to > > understand better. You can see that for the ipv4 brd group ipoib lets > > the SM to allocate the group and qkey (ie the create param of > > ipoib_mcast_join is zero), i will give it some thought and let you know > > how i think the rdma cm can plug into this scheme, will be happy to get > > other ideas as well. > > The rdma_cm knows the qkey that ipoib uses before it joins a multicast group. > See cma_join_ib_multicast() - call to ib_sa_get_mcmember_rec(). > > - Sean > > _______________________________________________ > openib-general mailing list > [email protected] > http://openib.org/mailman/listinfo/openib-general > > To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general > _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
