netdev - Re: [net-next PATCH v2 2/2] net: sched: cls_u32 changes to knode must appear atomic to readers

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Message-ID: <1411262450.26859.110.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 20 Sep 2014 18:20:50 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	xiyou.wangcong@...il.com, jhs@...atatu.com, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [net-next PATCH v2 2/2] net: sched: cls_u32 changes to knode
 must appear atomic to readers

On Fri, 2014-09-19 at 21:50 -0700, John Fastabend wrote:
> Changes to the cls_u32 classifier must appear atomic to the
> readers. Before this patch if a change is requested for both
> the exts and ifindex, first the ifindex is updated then the
> exts with tcf_exts_change(). This opens a small window where
> a reader can have a exts chain with an incorrect ifindex. This
> violates the the RCU semantics.

> CC: Eric Dumazet <edumazet@...gle.com>
> CC: Jamal Hadi Salim <jhs@...atatu.com>
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
> ---
>  net/sched/cls_u32.c |  135 ++++++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 126 insertions(+), 9 deletions(-)

Acked-by: Eric Dumazet <edumazet@...gle.com>


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