netdev - Re: IPoIB: Fix multicast packet drops before join is complete

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Message-ID: <alpine.DEB.1.10.0906111107390.29827@gentwo.org>
Date:	Thu, 11 Jun 2009 11:07:52 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
cc:	rdreier@...co.com, netdev@...r.kernel.org, yosefe@...taire.COM
Subject: Re: IPoIB: Fix multicast packet drops before join is complete

On Tue, 9 Jun 2009, David Miller wrote:

> From: Roland Dreier <rdreier@...co.com>
> Date: Tue, 09 Jun 2009 20:55:57 -0700
>
> > Hmm... how do I do that?  The interface gets an skb that it sees should
> > be sent to a multicast group that it is not a member of yet, and so it
> > fires off a request to join that group (as a send-only member).  How
> > does a netdev block the process that queued up a given skb to send?
> > Couldn't the packet have come through a local software bridge or
> > something like that, so the original process is long since lost to the
> > network stack?
>
> If a facility doesn't exist yet, we're going to have to create
> one.  It would need to do a downcall to the device when the
> user joins a multicast group on a socket, and then the device
> can do whatever magic is necessary to speak multicast immediately
> and sleep until it really is available for immediate use.

Umm?? My patch does that....

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