netdev - Re: [PATCH] net_sched: long word align struct qdisc_skb

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Message-ID: <20110223093001.28e1a8ef@nehalam>
Date:	Wed, 23 Feb 2011 09:30:01 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	David Miller <davem@...emloft.net>,
	Juliusz Chroboczek <Juliusz.Chroboczek@....jussieu.fr>,
	"John W. Linville" <linville@...driver.com>,
	netdev <netdev@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] net_sched: long word align struct qdisc_skb_cb data

On Wed, 23 Feb 2011 18:05:07 +0100
Eric Dumazet <eric.dumazet@...il.com> wrote:

> Le mercredi 23 février 2011 à 17:24 +0100, Patrick McHardy a écrit :
> > Am 23.02.2011 16:14, schrieb Eric Dumazet:
> > > diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
> > > index 16626a0..f40d32e 100644
> > > --- a/include/net/sch_generic.h
> > > +++ b/include/net/sch_generic.h
> > > @@ -218,6 +218,7 @@ struct tcf_proto {
> > >  
> > >  struct qdisc_skb_cb {
> > >  	unsigned int		pkt_len;
> > > +	unsigned int		sfb_classid;
> > >  	char			data[];
> > >  };
> > 
> > This could be moved into a SFB specific cb, similar to what netem
> > does.
> 
> Hmm... well... I want to be sure no other sch will destroy my values.
> 
> netem seems buggy then.
> 
> Probably following patch is needed ?

Yes, it was long word aligned when netem was written but
we seem to have bit creep.



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