netdev - Re: [RFC] qlcnic: Enhance ethtool to display board temperature.

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Message-ID: <51E9560F.7070902@hp.com>
Date:	Fri, 19 Jul 2013 08:06:55 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Himanshu Madhani <himanshu.madhani@...gic.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net,
	Dept_NX_Linux_NIC_Driver@...gic.com
Subject: Re: [RFC] qlcnic: Enhance ethtool to display board temperature.

On 07/18/2013 08:57 PM, Himanshu Madhani wrote:
> From: Himanshu Madhani <himanshu.madhani@...gic.com>
>
> We need to provide a mechanism for a user space application to query
> adapter temperature. This RFC patch is to request input on which of the
> following approach would be appropriate way to export this information.
>
> Here are the two approaches that I am exploring. Please review and
> provide your recommendation.
>
> 1. Enhance ethtool to add capability for driver to advertise its
>     board temperature as part of "ethtool -i <ethX>"
>
>      For example, following would be output for an interface which
>      has board temperature field populated via ethtool
>
>      "#ethtool -i p10p1"
>      driver: qlcnic
>      version: 5.2.44
>      bus-info: 0000:08:00.0
>      supports-statistics: yes
>      supports-test: yes
>      supports-eeprom-access: yes
>      supports-register-dump: yes
>      supports-priv-flags: no
>      board-temperature: 34
>
>      There will be update required for ethtool.c in the repository
>      git://git.kernel.org/pub/scm/network/ethtool/ethtool.git
>      maintained by Ben Hutchings.
>
>      if we decide to go with ethtool modification approach, I will send
>      patch to update ethtool repository. Attached patch at the end of this
>      email is for driver implementation for this approach.
>
> 2. Add a sysfs hook "brd_temp" which will be used by the application
>     to query board temperature specific to the particular interface
>
>     for example, driver with "brd_temp" sysfs hook will show temperature
>
>     "#cat /sys/class/net/p10p1/device/brd_temp"
>     34

Is it at all likely that other I/O cards have similar temperature 
sensors?  If so, then perhaps a more generic I/O card location would be 
better?  Looking for "temp" under /sys on my 3.5 system I see:

/sys/bus/platform/devices/coretemp.0
/sys/bus/platform/drivers/coretemp
/sys/bus/platform/drivers/coretemp/coretemp.0
/sys/devices/pci0000:00/0000:00:03.0/0000:0f:00.0/hwmon/hwmon0/temp1_input
/sys/devices/platform/hp-wmi/hddtemp
/sys/devices/platform/coretemp.0
/sys/devices/platform/coretemp.0/temp3_input
/sys/devices/platform/coretemp.0/temp3_label
/sys/devices/platform/coretemp.0/temp2_crit_alarm
/sys/devices/platform/coretemp.0/temp2_crit
/sys/devices/platform/coretemp.0/temp3_crit
/sys/devices/platform/coretemp.0/temp4_crit
/sys/devices/platform/coretemp.0/temp5_crit
/sys/devices/platform/coretemp.0/temp4_input
/sys/devices/platform/coretemp.0/temp4_label
/sys/devices/platform/coretemp.0/temp3_crit_alarm
/sys/devices/platform/coretemp.0/temp4_crit_alarm
/sys/devices/platform/coretemp.0/temp5_input
/sys/devices/platform/coretemp.0/temp5_label
/sys/devices/platform/coretemp.0/temp5_crit_alarm
/sys/devices/platform/coretemp.0/temp2_max
/sys/devices/platform/coretemp.0/temp3_max
/sys/devices/platform/coretemp.0/temp4_max
/sys/devices/platform/coretemp.0/temp5_max
/sys/devices/platform/coretemp.0/temp2_input
/sys/devices/platform/coretemp.0/temp2_label
/sys/module/coretemp
/sys/module/coretemp/drivers/platform:coretemp


Anyhow, it seems that one of your peers presently puts that information 
in that which is reported by ethtool -S

      ...
      eth_red_drops: 0
      be_on_die_temperature: 52
      rxq0: rx_bytes: 67532255030
      ...

rick jones

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