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

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Message-ID: <ada1vps4u9e.fsf@cisco.com>
Date:	Tue, 09 Jun 2009 20:55:57 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	David Miller <davem@...emloft.net>
Cc:	cl@...ux-foundation.org, netdev@...r.kernel.org,
	yosefe@...taire.COM
Subject: Re: IPoIB: Fix multicast packet drops before join is complete

 > Block the process joining the multicast group, not the entire
 > interface.

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?

 - R.
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