netdev - Re: [net v3] veth: advertise peer link once both links are tied together

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Date:	Fri, 10 Jun 2016 15:15:01 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Lance Richardson <lrichard@...hat.com>,
	Vincent Bernat <vincent@...nat.im>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Vijay Pandurangan <vijayp@...ayp.ca>,
	Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [net v3] veth: advertise peer link once both links are tied
 together

Le 08/06/2016 22:30, Lance Richardson a écrit :
[snip]
> I've been pondering how to fix this very problem off-and-on for a few months
> now, without having arrived at any solution that was particularly satisfying.
> 
> The main constraints I've been trying to meet are:
>    - User-space should be informed of veth pairing for both peers.
>    - RTM_NEWLINK messages should not refer to interfaces that haven't
>      been announced to user-space via previous RTM_NEWLINK messages.
>    - The first (and only the first) RTM_NEWLINK message for a given
>      interface should have ifi_changes set to ~0U, subsequent RTM_NEWLINK
>      messages should have ifi_changes set to reflect the flags that
>      have changed.
> 
> This is the closest I've come to a satisfactory solution, it does meet
> the above constraints but still seems a little unnatural to me:
The patch looks good to me. Can you submit it formally?