netdev - Re: [PATCH v4 net-next 1/1] net_sched: Introduce skbmod action

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Date:   Mon, 12 Sep 2016 14:58:34 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        xiyou.wangcong@...il.com, daniel@...earbox.net,
        john.r.fastabend@...el.com
Subject: Re: [PATCH v4 net-next 1/1] net_sched: Introduce skbmod action

On Mon, 2016-09-12 at 16:46 -0400, Jamal Hadi Salim wrote:
> From: Jamal Hadi Salim <jhs@...atatu.com>

> +
> +	/* XXX: if you are going to edit more fields beyond ethernet header
> +	 * (example when you add IP header replacement or vlan swap)
> +	 * then MAX_EDIT_LEN needs to change appropriately
> +	*/
> +	err = skb_ensure_writable(skb, ETH_HLEN);
> +	if (unlikely(err)) /* best policy is to drop on the floor */
> +		action = TC_ACT_SHOT;
> +
> +	rcu_read_lock();
> +	action = READ_ONCE(d->tcf_action);

You are overwriting @action, while you might have put TC_ACT_SHOT in it
3 lines above.

Maybe you meant :
	if (err)
		return TC_ACT_SHOT;