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

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Date:	Wed, 23 Feb 2011 18:05:07 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>,
	Juliusz Chroboczek <Juliusz.Chroboczek@....jussieu.fr>,
	"John W. Linville" <linville@...driver.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	netdev <netdev@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>
Subject: [PATCH] net_sched: long word align struct qdisc_skb_cb data

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 ?

Thanks

[PATCH] net_sched: long word align struct qdisc_skb_cb data

netem_skb_cb() does :

return (struct netem_skb_cb *)qdisc_skb_cb(skb)->data;

Unfortunatly struct qdisc_skb_cb data is not long word aligned, so
access to psched_time_t time_to_send uses a non aligned access.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 include/net/sch_generic.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 16626a0..dbdf2b5 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -218,7 +218,7 @@ struct tcf_proto {
 
 struct qdisc_skb_cb {
 	unsigned int		pkt_len;
-	char			data[];
+	long			data[];
 };
 
 static inline int qdisc_qlen(struct Qdisc *q)


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