netdev - Network cooling device and how to control NIC speed on thermal condition

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Date:   Tue, 25 Apr 2017 10:36:28 +0200
From:   Waldemar Rymarkiewicz <waldemar.rymarkiewicz@...il.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Network cooling device and how to control NIC speed on thermal condition

Hi,

I am not much aware of linux networking architecture so I'd like to
ask first before will start to dig into the code. Appreciate any
feedback.

I am looking on Linux thermal framework and on how to cool down the
system effectively when it hits thermal condition. Already existing
cooling methods cpu_cooling and clock_cooling are good. However, I
wanted to go further and dynamically control also a switch ports'
speed based on thermal condition. Lowering speed means less power,
less power means lower temp.

Is there any in-kernel interface to configure switch port/NIC from other driver?

Is there any mechanism to power save, when port/interface is not
really used (not much or low data traffic), embedded in networking
stack  or is it a task for NIC driver itself ?

I was thinking to create net_cooling device similarly to cpu_cooling
device which cool down the system scaling down cpu freq.  net_cooling
could lower down interface speed (or tune more parameters to achieve
).  Do you thing could this work form networking stack perspective?

Any pointers  to the code or a doc highly appreciated.

Thanks,
/Waldek