On Tue, 22 Nov 2011 06:17:00 -0800 "[email protected]" <[email protected]> wrote:
> Where can I find out more on how to do this, i.e. use opensm to create > mc groups at startup? This is not in an official release yet. But if you are willing, you can get the latest opensm code here: git://git.openfabrics.org/~alexnetes/opensm.git Build it and check out the man page on how to configure your partition config file. Let me know if the man page is insufficient documentation. Ira > > > Quoting Ira Weiny <[email protected]>: > > > On Mon, 21 Nov 2011 09:05:22 -0800 > > "Hefty, Sean" <[email protected]> wrote: > > > >> > From what I understand, and I may not understand correctly, to > >> > perform IB Multicast, betweeen two nodes, I need to swap addresses and > >> > remote keys for the two nodes. In the examples I have seen this has > >> > >> You only need to do this for unicast UD. Multicast doesn't require > >> exchanging addresses and qkeys, but see below. > >> > >> > been done via RDMA CM directly between the two nodes. Does it matter > >> > how this information is exchanged? In my application I will have > >> > >> For multicast, you need to 1. have the SA create the multicast > >> group and 2. join the group. To create the group, you need to > >> either have the SA automatically create the group (if this is > >> possible) or create it dynamically. To create the group > >> dynamically from user space, you should use the rdma_cm or ib_umad > >> interfaces. The rdma_cm is easier. > >> > > > > FWIW, OpenSM (current master branch) now has the ability to create > > multicast groups at startup, so 1 is possible. > > > > See: http://www.spinics.net/lists/linux-rdma/msg10021.html > > > > Ira > > > >> To join the group, you need to let the SA know that the node should > >> receive multicast traffic, so that it can program the switches. > >> This is done through the rdma_cm (easy way) or using ib_umad (hard > >> way that gets harder if you want to support multiple applications > >> joining the same group from the same system). > >> > >> > several nodes multicasting to several other nodes and I want to manage > >> > the connections from a independent application. What I would like to > >> > do is write this application, server, etc. so that each node would > >> > request connection with another node and then be provied with the > >> > information it needs to multicast. For example... Node 1 would > >> > request a connection (from the server app) Node 2 and Node 2 would > >> > request a connection (again, from the server app) to Node 1. The > >> > Server app would provide Node 2's "credentials" to Node 1 and likewise > >> > to Node 2. Is this even possible? > >> > >> The SA basically does the work that you're describing for your > >> server app. Node 1 can ask the SA to create a multicast group. > >> Node 2 can ask to join that group. Somehow node 2 needs to know > >> what group node 1 created. > >> -- > >> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > >> the body of a message to [email protected] > >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > -- > > Ira Weiny > > Member of Technical Staff > > Lawrence Livermore National Lab > > 925-423-8008 > > [email protected] > > > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-rdma" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Ira Weiny Member of Technical Staff Lawrence Livermore National Lab 925-423-8008 [email protected] -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
