netdev - Re: [PATCH net 6/7] net: ip6_gre: Split up ip6gre

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Date:   Thu, 17 May 2018 12:48:50 -0700
From:   William Tu <u9012063@...il.com>
To:     Petr Machata <petrm@...lanox.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Dmitry Kozlov <xeb@...l.ru>
Subject: Re: [PATCH net 6/7] net: ip6_gre: Split up ip6gre_changelink()

On Thu, May 17, 2018 at 7:36 AM, Petr Machata <petrm@...lanox.com> wrote:
> Extract from ip6gre_changelink() a reusable function
> ip6gre_changelink_common(). This will allow introduction of
> ERSPAN-specific _changelink() function with not a lot of code
> duplication.
>
> Signed-off-by: Petr Machata <petrm@...lanox.com>
> ---

LGTM.
Acked-by: William Tu <u9012063@...il.com>


>  net/ipv6/ip6_gre.c | 33 ++++++++++++++++++++++++---------
>  1 file changed, 24 insertions(+), 9 deletions(-)
>
> diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
> index 4dfa21d..c17e38b 100644
> --- a/net/ipv6/ip6_gre.c
> +++ b/net/ipv6/ip6_gre.c
> @@ -1921,37 +1921,52 @@ static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
>         return err;
>  }
>
> -static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
> -                            struct nlattr *data[],
> -                            struct netlink_ext_ack *extack)
> +static struct ip6_tnl *
> +ip6gre_changelink_common(struct net_device *dev, struct nlattr *tb[],
> +                        struct nlattr *data[], struct __ip6_tnl_parm *p_p,
> +                        struct netlink_ext_ack *extack)
>  {
>         struct ip6_tnl *t, *nt = netdev_priv(dev);
>         struct net *net = nt->net;
>         struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
> -       struct __ip6_tnl_parm p;
>         struct ip_tunnel_encap ipencap;
>
>         if (dev == ign->fb_tunnel_dev)
> -               return -EINVAL;
> +               return ERR_PTR(-EINVAL);
>
>         if (ip6gre_netlink_encap_parms(data, &ipencap)) {
>                 int err = ip6_tnl_encap_setup(nt, &ipencap);
>
>                 if (err < 0)
> -                       return err;
> +                       return ERR_PTR(err);
>         }
>
> -       ip6gre_netlink_parms(data, &p);
> +       ip6gre_netlink_parms(data, p_p);
>
> -       t = ip6gre_tunnel_locate(net, &p, 0);
> +       t = ip6gre_tunnel_locate(net, p_p, 0);
>
>         if (t) {
>                 if (t->dev != dev)
> -                       return -EEXIST;
> +                       return ERR_PTR(-EEXIST);
>         } else {
>                 t = nt;
>         }
>
> +       return t;
> +}
> +
> +static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
> +                            struct nlattr *data[],
> +                            struct netlink_ext_ack *extack)
> +{
> +       struct ip6gre_net *ign = net_generic(dev_net(dev), ip6gre_net_id);
> +       struct __ip6_tnl_parm p;
> +       struct ip6_tnl *t;
> +
> +       t = ip6gre_changelink_common(dev, tb, data, &p, extack);
> +       if (IS_ERR(t))
> +               return PTR_ERR(t);
> +
>         ip6gre_tunnel_unlink(ign, t);
>         ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
>         ip6gre_tunnel_link(ign, t);
> --
> 2.4.11
>