[openib-general] RDMA CM multicast

Hal Rosenstock halr at voltaire.com
Wed Jan 24 06:37:03 PST 2007


On Tue, 2007-01-23 at 19:58, Sean Hefty wrote:
> > rdma_join_multicast(0.0.0.0, port 0)	<- exchange group info out of band
> 
> Trying to work through this more, having the first node join seems trivial. 
> Getting additional nodes to join the same group through the rdma_cm is proving 
> more difficult...  The MGID of the group would need to be treated as an IPv6 
> address, with a join done using that address directly, versus mapping an IPv6 
> address to an MGID using the ipoib algorithm.

Doesn't this carve a hole in the IPv6 (multicast) address space (group
ID) ? If so, is that a hole we can carve out ?

-- Hal

> I still believe this is doable, it's just going to require more 
> thought/discussion to ensure that we get a clean implementation.
> 
> - Sean
> 
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