netdev - Re: [PATCH v2 2/2] ip_tunnel: add mpls over gre encapsulation

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Date:   Tue, 26 Sep 2017 19:58:21 +0200
From:   Amine Kherbouche <amine.kherbouche@...nd.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>, xeb@...l.ru,
        David Lamparter <equinox@...c24.net>
Subject: Re: [PATCH v2 2/2] ip_tunnel: add mpls over gre encapsulation

Hi Roopa,

Thanks for the feedback, I have just one question:

On 09/26/2017 05:15 PM, Roopa Prabhu wrote:
>> +static int ipgre_tunnel_encap_add_mpls_ops(void)
>> > +{
>> > +       int ret = -1;
>> > +
>> > +#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
>> > +       ret = ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
>> > +#endif
>> > +
>> > +       return ret;
>> > +}
>> > +
>> > +static void ipgre_tunnel_encap_del_mpls_ops(void)
>> > +{
>> > +#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
>> > +       ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
>> > +#endif
>> > +}
>> > +
>> >  static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
>> >                        struct nlmsghdr *nlh, struct net *net, u32 portid,
>> >                        unsigned int nlm_flags);
>> > @@ -2486,6 +2521,10 @@ static int __init mpls_init(void)
>> >                       0);
>> >         rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf,
>> >                       mpls_netconf_dump_devconf, 0);
>> > +       err = ipgre_tunnel_encap_add_mpls_ops();
>> > +       if (err)
>> > +               pr_err("Can't add mpls over gre tunnel ops\n");
>> > +
> This will throw an error  if CONFIG_NET_IP_TUNNEL is not enabled.
> Can you pls put the CONFIG_NET_IP_TUNNEL around
> ipgre_tunnel_encap_add_mpls_ops ?

You want the CONFIG_NET_IP_TUNNEL definition around the declaration of 
the function or when it's called ? or both ? (I can adjust the code for 
any case).

> see CONFIG_INET checks in the rest of af_mpls as example.
> same for del_ops
>

Thanks,

Amine