netdev - Re: ethtool fails to read some QSFP+ modules.

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Date: Mon, 1 Jul 2024 10:41:58 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Dan Merillat <git@....merillat.org>, ole@....pl
Cc: Michal Kubecek <mkubecek@...e.cz>, netdev <netdev@...r.kernel.org>
Subject: Re: ethtool fails to read some QSFP+ modules.

Forgot to add Krzysztof :p

On Mon, Jul 01, 2024 at 10:28:39AM +0300, Ido Schimmel wrote:
> On Sun, Jun 30, 2024 at 01:27:07PM -0400, Dan Merillat wrote:
> > 
> > I was testing an older Kaiam XQX2502 40G-LR4 and ethtool -m failed with netlink error.  It's treating a failure to read
> > the optional page3 data as a hard failure.
> > 
> > This patch allows ethtool to read qsfp modules that don't implement the voltage/temperature alarm data.
> 
> Thanks for the report and the patch. Krzysztof Olędzki reported the same
> issue earlier this year:
> https://lore.kernel.org/netdev/9e757616-0396-4573-9ea9-3cb5ef5c901a@ans.pl/
> 
> Krzysztof, are you going to submit the ethtool and mlx4 patches?
> 
> > From 3144fbfc08fbfb90ecda4848fc9356bde8933d4a Mon Sep 17 00:00:00 2001
> > From: Dan Merillat <git@....eginity.com>
> > Date: Sun, 30 Jun 2024 13:11:51 -0400
> > Subject: [PATCH] Some qsfp modules do not support page 3
> > 
> > Tested on an older Kaiam XQX2502 40G-LR4 module.
> > ethtool -m aborts with netlink error due to page 3
> > not existing on the module. Ignore the error and
> > leave map->page_03h NULL.
> 
> User space only tries to read this page because the module advertised it
> as supported. It is more likely that the NIC driver does not return all
> the pages. Which driver is it?