netdev - Re: igmp: Staggered igmp report intervals for unsolicited igmp reports

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Message-ID: <20100923172603.GM11157@obsidianresearch.com>
Date:	Thu, 23 Sep 2010 11:26:03 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	David Stevens <dlstevens@...ibm.com>, linux-rdma@...r.kernel.org,
	netdev@...r.kernel.org, Bob Arendt <rda@...con.com>
Subject: Re: igmp: Staggered igmp report intervals for unsolicited igmp
	reports

On Thu, Sep 23, 2010 at 10:32:17AM -0500, Christoph Lameter wrote:

> > Is the issue you are dropping IGMP packets because the 224.0.0.2 join
> > hasn't finished? Ideally you'd wait for the SA to reply before sending
> > a IGMP, but a simpler solution might just be to use the broadcast MLID
> > for packets addressed to a MGID that has not yet got a MLID. This
> > would bebe similar to the ethernet behaviour of flooding.
> 
> IGMP reports are sent on the multicast group not on 224.0.0.2. 224.0.0.2
> is only used when leaving a multicast group.

Hm, that is quite different than in IGMPv3.. How does this work at all
in IB? A message to the multicast group isn't going to make it to any
routers unless the routers use some other means to join the IB MGID.

Jason
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