netdev - Re: Multicast packet loss

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Date:	Fri, 13 Mar 2009 15:38:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	kchang@...enacr.com, netdev@...r.kernel.org,
	cl@...ux-foundation.org, bmb@...enacr.com
Subject: Re: Multicast packet loss

From: Eric Dumazet <dada1@...mosbay.com>
Date: Fri, 13 Mar 2009 23:30:31 +0100

> David Miller a écrit :
> >> Also, when an event was queued for later invocation, I also needed to keep
> >> a reference on "struct socket" to make sure it doesnt disappear before
> >> the invocation. Not all sockets are RCU guarded (we added RCU only for 
> >> some protocols (TCP, UDP ...). So I found keeping a read_lock
> >> on callback was the easyest thing to do. I now realize we might
> >> overflow preempt_count, so special care is needed.
> > 
> > You're using this in UDP so... make the rule that you can't use
> > this with a non-RCU-quiescent protocol.
> 
> UDP/TCP only ? I though many other protocols (not all using RCU) were
> using sock_def_readable() too...

Maybe create a inet_def_readable() just for this purpose :-)
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