linux-kernel - Re: [PATCH 0/2] Namespaceify two sysctls related with route

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Date:   Wed, 17 Aug 2022 20:52:37 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     cgel.zte@...il.com
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, xu.xin16@....com.cn
Subject: Re: [PATCH 0/2] Namespaceify two sysctls related with route

On Tue, 16 Aug 2022 02:25:22 +0000 cgel.zte@...il.com wrote:
> Different netns has different requirements on the setting of error_cost
> and error_burst, which are related with limiting the frequency of sending
> ICMP_DEST_UNREACH packets or outputing error message to dmesg.

Could you add a bit more detail about why you need this knob per netns?
The code looks fine, no objections there, what I'm confused by is that
we don't have this knob for IPv6. So is it somehow important enough for
v4 to be per-ns and yet not important enough to exist at all on v6?

Could you add Documentation in Documentation/admin-guide/sysctl/net.rst
while at it, and use READ_ONCE / WRITE_ONCE when accessing the sysctl?

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