netdev - Re: [net-next] openvswitch: add macro MODULE_ALIAS_VPORT

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Date:   Sat, 3 Jun 2017 22:58:22 -0700
From:   Pravin Shelar <pshelar@....org>
To:     Zhang Shengju <zhangshengju@...s.chinamobile.com>
Cc:     Pravin Shelar <pshelar@...ira.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [net-next] openvswitch: add macro MODULE_ALIAS_VPORT_TYPE for
 vport type alias

On Sat, Jun 3, 2017 at 6:47 AM, Zhang Shengju
<zhangshengju@...s.chinamobile.com> wrote:
> Add a new macro MODULE_ALIAS_VPORT_TYPE to unify and simplify the
> declaration of vport type alias, and replace magic numbers with
> symbolic constants.
>
> Signed-off-by: Zhang Shengju <zhangshengju@...s.chinamobile.com>
> ---
>  net/openvswitch/vport-geneve.c | 2 +-
>  net/openvswitch/vport-gre.c    | 2 +-
>  net/openvswitch/vport-vxlan.c  | 2 +-
>  net/openvswitch/vport.h        | 3 +++
>  4 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/net/openvswitch/vport-geneve.c b/net/openvswitch/vport-geneve.c
> index 5aaf3ba..1c068d6 100644
> --- a/net/openvswitch/vport-geneve.c
> +++ b/net/openvswitch/vport-geneve.c
> @@ -141,4 +141,4 @@ static void __exit ovs_geneve_tnl_exit(void)
>
>  MODULE_DESCRIPTION("OVS: Geneve switching port");
>  MODULE_LICENSE("GPL");
> -MODULE_ALIAS("vport-type-5");
> +MODULE_ALIAS_VPORT_TYPE(OVS_VPORT_TYPE_GENEVE);
> diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
> index 0e72d95..48a5852 100644
> --- a/net/openvswitch/vport-gre.c
> +++ b/net/openvswitch/vport-gre.c
> @@ -113,4 +113,4 @@ static void __exit ovs_gre_tnl_exit(void)
>
>  MODULE_DESCRIPTION("OVS: GRE switching port");
>  MODULE_LICENSE("GPL");
> -MODULE_ALIAS("vport-type-3");
> +MODULE_ALIAS_VPORT_TYPE(OVS_VPORT_TYPE_GRE);

This is user visible change. For example this is changing the gre
module alias from "vport-type-3" to "vport-type-OVS_VPORT_TYPE_GRE".
This could break userspace application.