netdev - Re: [net-next 02/14] net/mlx5: Expose NIC temperature via hardware monitoring kernel API

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Date: Tue, 25 Jul 2023 20:31:52 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Saeed Mahameed <saeed@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>, Paolo Abeni
 <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>, Saeed Mahameed
 <saeedm@...dia.com>, netdev@...r.kernel.org, Tariq Toukan
 <tariqt@...dia.com>, Adham Faris <afaris@...dia.com>, Gal Pressman
 <gal@...dia.com>
Subject: Re: [net-next 02/14] net/mlx5: Expose NIC temperature via hardware
 monitoring kernel API

On Mon, 24 Jul 2023 15:44:14 -0700 Saeed Mahameed wrote:
> Expose NIC temperature by implementing hwmon kernel API, which turns
> current thermal zone kernel API to redundant.
> 
> For each one of the supported and exposed thermal diode sensors, expose
> the following attributes:
> 1) Input temperature.
> 2) Highest temperature.
> 3) Temperature label.
> 4) Temperature critical max value:
>    refers to the high threshold of Warning Event. Will be exposed as
>    `tempY_crit` hwmon attribute (RO attribute). For example for
>    ConnectX5 HCA's this temperature value will be 105 Celsius, 10
>    degrees lower than the HW shutdown temperature).
> 5) Temperature reset history: resets highest temperature.
> 
> For example, for dualport ConnectX5 NIC with a single IC thermal diode
> sensor will have 2 hwmon directories (one for each PCI function)
> under "/sys/class/hwmon/hwmon[X,Y]".
> 
> Listing one of the directories above (hwmonX/Y) generates the
> corresponding output below:
> 
> $ grep -H -d skip . /sys/class/hwmon/hwmon0/*

I missed it glancing on the series yesterday because it's just 
a warning in pw - we should really get hwmon folks and ML CCed
on this one.
-- 
pw-bot: cr