[openib-general] RDMA CM multicast

[Hal Rosenstock]

On Wed, 2007-01-24 at 13:13, Sean Hefty wrote:
> > Doesn't this carve a hole in the IPv6 (multicast) address space (group
> > ID) ? If so, is that a hole we can carve out ?
> 
> I don't think that this causes any issues that weren't previously there.  IPOIB 
> maps an IPv6 address into 80-bits, so not every IPv6 address can be mapped into 
> an MGID using the ipoib algorithm.

I forgot about this.

> What the rdma_cm needs to determine is whether the sockaddr passed into 
> rdma_join_multicast is an IPv6 address that needs to be translated into an MGID, 
> or whether the address is itself an MGID.  I guess that it might be able to look 
> at the address to see if it matches the SA created MGID format (0xff1?a01b...).

Makes sense.

-- Hal

> - Sean