netdev - Re: Turn on net_dbg_ratelimited() diagnostics in linux-5.10.67 ?

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Date:   Tue, 28 Sep 2021 22:29:00 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     "Templin (US), Fred L" <Fred.L.Templin@...ing.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Turn on net_dbg_ratelimited() diagnostics in linux-5.10.67 ?

On Tue, Sep 28, 2021 at 3:07 PM Templin (US), Fred L
<Fred.L.Templin@...ing.com> wrote:
>
> Hi, it has been a while since I have delved into linux kernel networking internals,
> and it appears that diagnostics-generation code has been significantly cleaned up
> over the years since I last checked. I am working in linux-5.10.67, and I see that
> network diagnostics are now generated by calls to "net_dbg_ratelimited()" but
> that these seem to be disabled by default.
>
> How can I turn on net_dbg_ratelimited() diagnostics, and once enabled where
> do I go to see the diagnostics output?

Please look at how to use dynamic debug:
https://www.kernel.org/doc/html/v5.0/admin-guide/dynamic-debug-howto.html

Thanks.