[ofw] patch: [ibbus] Add A new function to IBAL that allows one to create a multicast group without attaching a QP to it.

[Hefty, Sean]

> In a more practical way, what we want to achieve is a change to the current
> ipoib design. We would like to separate the qps life cycle from the
> multicast group. In the current code we had to make sure that the qp is
> always there before we can attach to the group.

This makes sense, and it would be nice to include this in the patch description.

I think you can achieve this without changing the existing APIs.  Just let the QP handle be optional.