netdev - Re: [PATCH net-next v2 5/9] geneve: Add support to collect tunnel metadata.

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Date:	Tue, 18 Aug 2015 18:07:28 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Pravin B Shelar <pshelar@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 5/9] geneve: Add support to collect tunnel metadata.

On Mon, Aug 17, 2015 at 2:11 PM, Pravin B Shelar <pshelar@...ira.com> wrote:
> diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> index 546494d..cb2d874 100644
> --- a/drivers/net/geneve.c
> +++ b/drivers/net/geneve.c
> +static int geneve_configure(struct net *net, struct net_device *dev,
> +                           __be32 rem_addr, __u32 vni, __u8 ttl, __u8 tos,
> +                           __u16 dst_port, bool metadata)
[...]
> -       if (!data[IFLA_GENEVE_ID] || !data[IFLA_GENEVE_REMOTE])
> -               return -EINVAL;
> +       if (metadata && rtnl_dereference(gn->collect_md_tun))
> +               return -EEXIST;

This will allow you to configure a collect_md_tun devices and normal
devices on top of each other, even though the latter will never get
hit in that situation.
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