netdev - Re: [PATCH net-next 2/3] net: dsa: mv88e6xxx: replace ATU violation prints with trace points

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Date:   Thu, 08 Dec 2022 16:22:53 +0100
From:   netdev@...io-technology.com
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Saeed Mahameed <saeed@...nel.org>, netdev@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next 2/3] net: dsa: mv88e6xxx: replace ATU violation
 prints with trace points

On 2022-12-08 15:49, Vladimir Oltean wrote:
> On Wed, Dec 07, 2022 at 04:14:16PM -0800, Saeed Mahameed wrote:
>> > 	if (val & MV88E6XXX_G1_ATU_OP_AGE_OUT_VIOLATION) {
>> > -		dev_err_ratelimited(chip->dev,
>> > -				    "ATU age out violation for %pM fid %u\n",
>> > -				    entry.mac, fid);
>> > +		trace_mv88e6xxx_atu_age_out_violation(chip->dev, spid,
>> > +						      entry.mac, fid);
>> 
>> no stats here? tracepoints are disabled by default and this event will 
>> go
>> unnoticed, users usually monitor light weight indicators such as 
>> stats, then
>> turn on tracepoints to see what's actually happening..
> 
> I believe that the ATU age out violation handler is dead code 
> currently.
> The driver does not enable the MV88E6XXX_PORT_ASSOC_VECTOR_INT_AGE_OUT 
> bit
> (interrupt on age out).
> 
> I just converted the existing debugging prints to trace points. Open to
> more suggestions, but I believe that if I introduce a counter, it would
> always return 0.

The follow-up patch set to the MAB patch set I have, will make use of 
the age
out violation.