netdev - Re: [PATCH net-next 2/2] openvswitch: Fix skb->protocol for vlan frames.

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Message-ID: <20161128234246.1a886246@griffin>
Date:   Mon, 28 Nov 2016 23:42:46 +0100
From:   Jiri Benc <jbenc@...hat.com>
To:     Jarno Rajahalme <jarno@....org>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] openvswitch: Fix skb->protocol for vlan
 frames.

On Mon, 28 Nov 2016 14:29:39 -0800, Jarno Rajahalme wrote:
> I’m not sure what you suggest here. Obviously the kernel ABI can not
> be changed as existing userspace code expects upcalled packets to be
> non-accelerated. Also, if userspace pushes vlan headers, the packet
> will actually have them.

The user space API needs to be preserved, of course. I'm talking about
what happens internally in the kernel.

See this patchset: https://www.spinics.net/lists/netdev/msg398827.html

> Would this incremental fix this:
> 
> diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
> index 9be9fda..37f1bb9 100644
> --- a/net/openvswitch/flow.c
> +++ b/net/openvswitch/flow.c
> @@ -354,6 +354,8 @@ static int parse_vlan(struct sk_buff *skb, struct
> sw_flow_key *key) res = parse_vlan_tag(skb, &key->eth.vlan);
>  		if (res <= 0)
>  			return res;
> +		if (skb->protocol == htons(ETH_P_TEB))
> +			skb->protocol = key->eth.vlan.tpid;
>  	}
>  
>  	/* Parse inner vlan tag. */

I'll look at this tomorrow. But it seems we're adding more and more
hacks instead of cleaning up the vlan handling.

 Jiri