netdev - Re: [PATCH net] net: dsa: fix bonding with ARP monitoring by updating trans

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Message-ID: <20220715175516.6770c863@kernel.org>
Date:   Fri, 15 Jul 2022 17:55:16 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jonathan Toppins <jtoppins@...hat.com>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Hangbin Liu <liuhangbin@...il.com>,
        Brian Hutchinson <b.hutchman@...il.com>
Subject: Re: [PATCH net] net: dsa: fix bonding with ARP monitoring by
 updating trans_start manually

On Sat, 16 Jul 2022 00:26:13 +0000 Vladimir Oltean wrote:
> > Make bonding not depend on a field which is only valid for HW devices
> > which use the Tx watchdog. Let me find the thread...
> > https://lore.kernel.org/all/20220621213823.51c51326@kernel.org/  
> 
> That won't work in the general case with dsa_slave_get_stats64(), which
> may take the stats from hardware (delayed) or from dev_get_tstats64().

Ah, that's annoying.

> Also, not to mention that ARP monitoring used to work before the commit
> I blamed, this is a punctual fix for a regression.

trans_start is for the watchdog. This is the third patch pointlessly 
messing with trans_start while the bug is in bonding. It's trying to
piggy back on semantics which are not universally true.

Fix bonding please.