netdev - Re: [PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation

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Date:   Wed, 4 Oct 2017 19:03:22 +0200
From:   Amine Kherbouche <amine.kherbouche@...nd.com>
To:     Tom Herbert <tom@...bertland.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        xeb@...l.ru, roopa <roopa@...ulusnetworks.com>, equinox@...c24.net
Subject: Re: [PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation



On 09/29/2017 06:11 AM, Tom Herbert wrote:
>> > @@ -122,6 +125,30 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
>> >  }
>> >  EXPORT_SYMBOL(gre_parse_header);
>> >
>> > +#if IS_ENABLED(CONFIG_MPLS)
>> > +int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len)
>> > +{
>> > +       if (unlikely(!pskb_may_pull(skb, gre_hdr_len)))
>> > +               goto drop;
>> > +
>> > +       /* Pop GRE hdr and reset the skb */
>> > +       skb_pull(skb, gre_hdr_len);
>> > +       skb_reset_network_header(skb);
>> > +
> I don't see why MPLS/GRE needs to be a special case in gre_rcv. Can't
> we just follow the normal processing patch which calls the proto ops
> handler for the protocol in the GRE header? Also, if protocol specific
> code is added to rcv function that most likely means that we need to
> update the related offloads also (grant it that MPLS doesn't support
> GRO but it looks like it supports GSO). Additionally, we'd need to
> consider if flow dissector needs a similar special case (I will point
> out that my recently posted patches there eliminated TEB as the one
> special case in GRE dissection).
>
> Thanks,
> Tom

Hi Tom,

Thanks for the feedback, I think this is the best way to do it, I'll do 
a v6 asap.

Regards,
Amine