netdev - Re: [PATCH net-next v9 06/11] net: ipv6: Use link netns in newlink() of rtnl_link

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Message-ID: <CABAhCOT8sCV4RgBWwfYjCw2xoZbdiYG8yuWReigx-u5DibTaiA@mail.gmail.com>
Date: Thu, 13 Feb 2025 16:37:34 +0800
From: Xiao Liang <shaw.leon@...il.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: alex.aring@...il.com, andrew+netdev@...n.ch, 
	b.a.t.m.a.n@...ts.open-mesh.org, bpf@...r.kernel.org, bridge@...ts.linux.dev, 
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	edumazet@...gle.com, herbert@...dor.apana.org.au, horms@...nel.org, 
	kuba@...nel.org, linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
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	linux-wpan@...r.kernel.org, miquel.raynal@...tlin.com, netdev@...r.kernel.org, 
	osmocom-net-gprs@...ts.osmocom.org, pabeni@...hat.com, shuah@...nel.org, 
	stefan@...enfreihafen.org, steffen.klassert@...unet.com, 
	wireguard@...ts.zx2c4.com
Subject: Re: [PATCH net-next v9 06/11] net: ipv6: Use link netns in newlink()
 of rtnl_link_ops

On Thu, Feb 13, 2025 at 3:05 PM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
>
[...]
> > diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
> > index 863852abe8ea..108600dc716f 100644
> > --- a/net/ipv6/ip6_gre.c
> > +++ b/net/ipv6/ip6_gre.c
> > @@ -1498,7 +1498,8 @@ static int ip6gre_tunnel_init_common(struct net_device *dev)
> >       tunnel = netdev_priv(dev);
> >
> >       tunnel->dev = dev;
> > -     tunnel->net = dev_net(dev);
> > +     if (!tunnel->net)
> > +             tunnel->net = dev_net(dev);
>
> Same question as patch 5 for here and other parts.
> Do we need this check and assignment ?
>
> ip6gre_newlink_common
> -> nt->net = dev_net(dev)
> -> register_netdevice
>   -> ndo_init / ip6gre_tunnel_init()
>     -> ip6gre_tunnel_init_common
>       -> tunnel->net = dev_net(dev)

Will remove this line.