netdev - ethtool fails to read some QSFP+ modules.

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Message-ID: <54b537c6-aca4-45be-9df0-53c80a046930@dan.merillat.org>
Date: Sun, 30 Jun 2024 13:27:07 -0400
From: Dan Merillat <git@....merillat.org>
To: Michal Kubecek <mkubecek@...e.cz>, netdev <netdev@...r.kernel.org>
Subject: ethtool fails to read some QSFP+ modules.

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.
View attachment "0001-Some-qsfp-modules-do-not-support-page-3.patch" of type "text/x-patch" (1007 bytes)