netdev - Re: [PATCH net] ip[6]: don't register inet[6]dev when dev is down

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Message-ID: <7238f160-2547-c51a-c8fe-bcbc5d774239@6wind.com>
Date:   Thu, 6 Jul 2017 14:08:08 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Hongjun Li <hongjun.li@...nd.com>
Subject: Re: [PATCH net] ip[6]: don't register inet[6]dev when dev is down

Le 06/07/2017 à 00:43, Cong Wang a écrit :
> On Wed, Jul 5, 2017 at 8:57 AM, Nicolas Dichtel
> <nicolas.dichtel@...nd.com> wrote:
>> When a device changes from one netns to another, it's first unregistered,
>> then the netns reference is updated and the dev is registered in the new
>> netns. Thus, when a slave moves to another netns, it is first
>> unregistered. This triggers a NETDEV_UNREGISTER event which is caught by
>> the bonding driver. The driver calls bond_release(), which calls
>> dev_set_mtu() and thus triggers NETDEV_CHANGEMTU (the device is still in
>> the old netns).
> 
> I think in this special case it is meaningless to send
> NETDEV_CHANGEMTU, because the device is dying within
> its old netns, who still cares about its mtu change?
> 
> Something like the attached patch...
Yes, your patch seems good and I hesitated with something like this.
But I don't see a valid case where the inet[6]dev must be created on a down
interface. I think the patch is valid, even with your patch.


Regards,
Nicolas