[openib-general] multicast code/merge status

[Hal Rosenstock]

On Wed, 2007-01-10 at 14:34, Or Gerlitz wrote:
> On 1/10/07, Sean Hefty <mshefty at ichips.intel.com> wrote:
> > > mmm, weird, are there active rdmacm multicast consumers involved in
> > > this settings?
> >
> > I believe the issue is restricted to ipoib only.
> 
> What does it means in this context that ipoib attempts to join a non
> exisiting group, does it mean that ipoib assumes that the sm would
> create the group?

IPmc senders do send only joins and in IB this is insufficient to create
the group. The group would need to be precreated or setup by the
receiver prior to the sender.

-- Hal

> > > OK, got you at last (sorry but i have somehow ignored the call to
> > > ib_addr_get_mgid() at the rdmacm code). So to achieve interop with
> > > IPoIB all we need to do is remove the rdmacm signature bit and not to
> > > over-write the rdmacm qkey on the the qkey of the ipoib ipv4 broadcast
> > > group, are you ok with that?
> 
> > I believe this would achieve interop with ipoib.  However, overwriting the qkey
> > may break any existing UD communication that the user may have.  I just need to
> > think about this more, and see what we can come up with.
> 
> Basically, since there is only one QKEY per UD QP, a user IB UD app
> should either set a qp per qkey or take the same approach as IPoIB
> does, one qp, one qkey, all unicast/mcast traffic and mcast joins use
> the same qkey, it sounds fine to me.
> 
> Or.
> 
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