netdev - Re: [PATCH v2 net-next 03/15] ipv6: addrconf_disable

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Message-ID: <20240227185157.37355343@kernel.org>
Date: Tue, 27 Feb 2024 18:51:57 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Paolo Abeni
 <pabeni@...hat.com>, David Ahern <dsahern@...nel.org>, Jiri Pirko
 <jiri@...dia.com>, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH v2 net-next 03/15] ipv6: addrconf_disable_ipv6()
 optimizations

On Tue, 27 Feb 2024 15:01:48 +0000 Eric Dumazet wrote:
> +	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
> +		WRITE_ONCE(*p, newf);
> +		return 0;
> +	}
> +
>  	if (!rtnl_trylock())
>  		return restart_syscall();
>  
> -	net = (struct net *)table->extra2;
>  	old = *p;
>  	WRITE_ONCE(*p, newf);
>  
> -	if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
> -		rtnl_unlock();
> -		return 0;
> -	}
> -
> -	if (p == &net->ipv6.devconf_all->disable_ipv6) {
> -		WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);

Why is this line going away? We pulled up the handling of devconf_all
not devconf_dflt

> +	if (p == &net->ipv6.devconf_all->disable_ipv6)
>  		addrconf_disable_change(net, newf);