netdev - Re: net: dsa: realtek: silent indirect reg read failures on SMP

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Date:   Thu, 10 Feb 2022 00:10:23 -0300
From:   Luiz Angelo Daros de Luca <luizluca@...il.com>
To:     Alvin Šipraga <ALSI@...g-olufsen.dk>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arınç ÜNAL <arinc.unal@...nc9.com>
Subject: Re: net: dsa: realtek: silent indirect reg read failures on SMP

> > So I used this command:
> >
> >     while true; do phytool read swp2/2/0x01; sleep 0.1; done
>
> I'll test it and report.

In my single processor device, I got stable readings:

root@...nWrt:/# while true; do phytool read lan1/2/0x01; done | time awk '!a[$1]
++'
0x79c9
^CCommand terminated by signal 2
real    4m 56.44s
user    0m 1.61s
sys     0m 0.72s

And most of the time I was executing three copies of that loop in parallel.
I tried with and without my patches. All of them resulted in the same behavior.

Sorry but I believe my non-SMP device is not "affected enough" to help
debug this issue. Is your device SMP?

---
Luiz