netdev - Re: [PATCH] net: add net namespace inode for all net

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Date:   Tue, 9 Mar 2021 21:12:45 +0100
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Tony Lu <tonylu@...ux.alibaba.com>, davem@...emloft.net,
        rostedt@...dmis.org, mingo@...hat.com,
        Lorenz Bauer <lmb@...udflare.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: add net namespace inode for all net_dev events



On 3/9/21 5:43 AM, Tony Lu wrote:
> There are lots of net namespaces on the host runs containers like k8s.
> It is very common to see the same interface names among different net
> namespaces, such as eth0. It is not possible to distinguish them without
> net namespace inode.
> 
> This adds net namespace inode for all net_dev events, help us
> distinguish between different net devices.
> 
> Output:
>   <idle>-0       [006] ..s.   133.306989: net_dev_xmit: net_inum=4026531992 dev=eth0 skbaddr=0000000011a87c68 len=54 rc=0
> 
> Signed-off-by: Tony Lu <tonylu@...ux.alibaba.com>
> ---
>

There was a proposal from Lorenz to use netns cookies (SO_NETNS_COOKIE) instead.

They have a guarantee of being not reused.

After 3d368ab87cf6681f9 ("net: initialize net->net_cookie at netns setup")
net->net_cookie is directly available.