netdev - Re: [PATCH net-next v10 2/5] openvswitch: set skb protocol and mac

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Message-ID: <20160627113530.00b6864d@griffin>
Date:	Mon, 27 Jun 2016 11:35:30 +0200
From:	Jiri Benc <jbenc@...hat.com>
To:	Simon Horman <simon.horman@...ronome.com>
Cc:	pravin shelar <pshelar@....org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	ovs dev <dev@...nvswitch.org>
Subject: Re: [PATCH net-next v10 2/5] openvswitch: set skb protocol and
 mac_len when receiving on internal device

On Thu, 23 Jun 2016 11:04:38 +0900, Simon Horman wrote:
> I think you are right as IIRC the call to skb_reset_mac_header was
> added for this use-case. Its unfortunate that we can't use it in
> internal_dev_xmit() because of loosing track of MPLS as you mentioned
> earlier. But it does seem that setting mac_header to ~0 works well
> in conjunction with updates to OvS posted earlier in this sub-therad.
> 
> I have the following working. Jiri, is the ip_gre portion acceptable to you?

Sorry for the late reply, I was off the last week.

> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index 58d323289872..e6772b6934a3 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -279,7 +279,7 @@ static int __ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
>  		if (tunnel->dev->type != ARPHRD_NONE)
>  			skb_pop_mac_header(skb);
>  		else
> -			skb_reset_mac_header(skb);
> +			skb->mac_header = (typeof(skb->mac_header))~0U;

Looks good. We should introduce a helper for this, though
(skb_unset_mac_header or so).

Thanks!

 Jiri