netdev - Re: [PATCH v3 net-next 2/3] openvswitch: Use is_skb

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Date:   Wed, 30 Nov 2016 14:51:59 +0100
From:   Jiri Benc <jbenc@...hat.com>
To:     Jarno Rajahalme <jarno@....org>
Cc:     netdev@...r.kernel.org, pshelar@....org, e@...g.me
Subject: Re: [PATCH v3 net-next 2/3] openvswitch: Use is_skb_forwardable()
 for length check.

On Tue, 29 Nov 2016 15:30:52 -0800, Jarno Rajahalme wrote:
> @@ -504,11 +485,20 @@ void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
>  		goto drop;
>  	}
>  
> -	if (unlikely(packet_length(skb, vport->dev) > mtu &&
> -		     !skb_is_gso(skb))) {
> -		net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
> -				     vport->dev->name,
> -				     packet_length(skb, vport->dev), mtu);
> +	if (unlikely(!is_skb_forwardable(vport->dev, skb))) {

How does this work when the vlan tag is accelerated? Then we can be
over MTU, yet the check will pass.

 Jiri