netdev - Re: [PATCH v2 net-next 3/4] net: dsa: mv88e6xxx: replace ATU violation prints with trace points

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Date:   Fri, 9 Dec 2022 16:07:04 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Hans J. Schultz" <netdev@...io-technology.com>,
        Saeed Mahameed <saeed@...nel.org>
Subject: Re: [PATCH v2 net-next 3/4] net: dsa: mv88e6xxx: replace ATU
 violation prints with trace points

On 12/9/22 09:28, Vladimir Oltean wrote:
> In applications where the switch ports must perform 802.1X based
> authentication and are therefore locked, ATU violation interrupts are
> quite to be expected as part of normal operation. The problem is that
> they currently spam the kernel log, even if rate limited.
> 
> Create a series of trace points, all derived from the same event class,
> which log these violations to the kernel's trace buffer, which is both
> much faster and much easier to ignore than printing to a serial console.
> 
> New usage model:
> 
> $ trace-cmd list | grep mv88e6xxx
> mv88e6xxx
> mv88e6xxx:mv88e6xxx_atu_full_violation
> mv88e6xxx:mv88e6xxx_atu_miss_violation
> mv88e6xxx:mv88e6xxx_atu_member_violation
> $ trace-cmd record -e mv88e6xxx sleep 10
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian