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

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Message-ID: <CAOrHB_D6EQ+ERvjtV4bsHz-SMXeCxDgKvLDmWpuck8SCXUC8tg@mail.gmail.com>
Date:   Sun, 4 Jun 2017 19:29:31 -0700
From:   Pravin Shelar <pshelar@....org>
To:     张胜举 <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 Sun, Jun 4, 2017 at 1:12 AM, 张胜举 <zhangshengju@...s.chinamobile.com> wrote:
>> -----Original Message-----
>> From: Pravin Shelar [mailto:pshelar@....org]
>> Sent: Sunday, June 04, 2017 1:58 PM
>> 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.
> Hi Shelar,
> Actually this change does not change module alias name. I use '__stringify' to
> address this.  Below is my build result:
> ```
> [zhangshengju@...mote net-next]$ modinfo net/openvswitch/vport-gre.ko
> filename:       /gitlab/net-next/net/openvswitch/vport-gre.ko
> alias:          vport-type-3
> ...
> ```

Yes, I expected this. But when I tried modinfo with your patch, I did
not see it. here is modinfo output from my setup.
---8<---
root@...ntu:/home/pravin/linux/net-next# modinfo net/openvswitch/vport-gre.ko
filename:       /home/pravin/linux/net-next/./net/openvswitch/vport-gre.ko
alias:          vport-type-OVS_VPORT_TYPE_GRE
license:        GPL
description:    OVS: GRE switching port
srcversion:     AD3B4449820F294E0B5681C
depends:        openvswitch
intree:         Y
vermagic:       4.12.0-rc2+ SMP mod_unload modversions