[ofa-general] [PATCH 1/3] mcast loopback block

[Olga Shern (Voltaire)]

On 6/2/08, Ralph Campbell <ralph.campbell at qlogic.com> wrote:
>
> On Mon, 2008-06-02 at 20:52 +0300, Olga Shern (Voltaire) wrote:
> >
> >
> > On 6/2/08, Ralph Campbell <ralph.campbell at qlogic.com> wrote:
> >         What do you mean by "block loopback"?
> >         Does this mean a posted send WR for a multicast packet
> >         that matches the local LID is not sent at all or
> >         the packet is sent on the wire but not sent to
> >         the local QP? Or is it something else?
> >
> >
> > It controls the ConnectX HCA multicast packets block loopback
> > (blck_lb) for self QP. The patch is designed to enable or
> >
> > disable blocking of all multicast packets on self QP created on the
> > ConnectX HCA
>
> I understand that the patch enables/disables the bit.
> You didn't really answer my question which is what does
> the bit really do. I'm pretty sure it means that multicast
> packets aren't forwarded to any locally attached QPs
> but I wanted to be sure that is what it does.
>
>
No,
It isn't  disabled  for every QP (by default loopback is enabled),
when you attach QP to multicast group you can decide to disable  it (the
decision is done per QP)
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