netdev - Re: [net-next PATCH v2 1/1] net_sched fix: reclassification needs to consider ether protocol changes

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Date:	Wed, 17 Feb 2016 09:27:06 -0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Jamal Hadi Salim <jhs@...atatu.com>
Cc:	David Miller <davem@...emloft.net>,
	Daniel Borkmann <daniel@...earbox.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [net-next PATCH v2 1/1] net_sched fix: reclassification needs to
 consider ether protocol changes

On Wed, Feb 17, 2016 at 3:37 AM, Jamal Hadi Salim <jhs@...atatu.com> wrote:
> From: Jamal Hadi Salim <jhs@...atatu.com>
>
> actions could change the etherproto in particular with ethernet
> tunnelled data. Typically such actions, after peeling the outer header,
> will ask for the packet to be  reclassified. We then need to restart
> the classification with the new proto header.
>
> Example setup used to catch this:
> sudo tc qdisc add dev $ETH ingress
> sudo $TC filter add dev $ETH parent ffff: pref 1 protocol 802.1Q \
> u32 match u32 0 0 flowid 1:1 \
> action  vlan pop reclassify
>
> Fixes: 3b3ae880266d ("net: sched: consolidate tc_classify{,_compat}")
> Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
> ---
>  net/sched/sch_api.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
> index b5c2cf2..af46fee 100644
> --- a/net/sched/sch_api.c
> +++ b/net/sched/sch_api.c
> @@ -1822,7 +1822,6 @@ int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp,
>  #ifdef CONFIG_NET_CLS_ACT
>         const struct tcf_proto *old_tp = tp;
>         int limit = 0;
> -

Why remove this empty line? I think it is still useful. :)

Also your patch should be targeted to -net instead of -net-next, since it
fixes a bug.

Thanks.