Or Gerlitz wrote:
> Just to make sure, by "ipoib multicast group" you mean an MGID which is 
> derives from an IP Multicast address and the routing info on the device 
> this address/subnets is routed to (ie the ipoib device pkey which you 
> can get from the broadcast MAC of this device)?

I mean a group that ipoib has joined.

> How and Why does the proposed code enforces that?

The ib_multicast module does not enforce this.  The rdma_cm joins different 
groups, but still derives an MGID from an IP multicast address.  A new kernel 
module could join the same groups as ipoib.

- Sean

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