linux-kernel - Re: [PATCH net v1 1/1] ethtool: fix clearing of WoL flags

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Message-ID: <20231019164553.zcc6d2vbxzw4m4c2@lion.mk-sys.cz>
Date:   Thu, 19 Oct 2023 18:45:53 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Köry Maincent <kory.maincent@...tlin.com>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Vladimir Oltean <olteanv@...il.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net v1 1/1] ethtool: fix clearing of WoL flags

On Thu, Oct 19, 2023 at 09:20:31AM -0700, Florian Fainelli wrote:
> On 10/19/23 06:27, Köry Maincent wrote:
> > On Thu, 19 Oct 2023 12:50:48 +0200
> > Michal Kubecek <mkubecek@...e.cz> wrote:
> > 
> > > On Thu, Oct 19, 2023 at 12:21:14PM +0200, Köry Maincent wrote:
> > > > On Thu, 19 Oct 2023 11:51:40 +0200 > Michal Kubecek <mkubecek@...e.cz>
> > > > wrote:
> > > > > 
> > > > > The issue was indeed introduced by commit 108a36d07c01 ("ethtool: Fix
> > > > > mod state of verbose no_mask bitset"). The problem is that a "no mask"
> > > > > verbose bitset only contains bit attributes for bits to be set. This
> > > > > worked correctly before this commit because we were always updating
> > > > > a zero bitmap (since commit 6699170376ab ("ethtool: fix application of
> > > > > verbose no_mask bitset"), that is) so that the rest was left zero
> > > > > naturally. But now the 1->0 change (old_val is true, bit not present in
> > > > > netlink nest) no longer works.
> > > > 
> > > > Doh I had not seen this issue! Thanks you for reporting it.
> > > > I will send the revert then and will update the fix for next merge-window.
> > > 
> > > Something like the diff below (against current mainline) might do the
> > > trick but it's just an idea, not even build tested.
> > 
> > Seems a good idea without adding too much complexity to the code.
> > Will try that and send it in next merge window.
> 
> Not sure what you mean by next merge window, we need a fix for right now, or
> we need to revert 6699170376ab ("ethtool: fix application of verbose no_mask
> bitset").

Not that one, that's an old commit that was correct from functional
point of view (the only problem was that it sometimes triggered
a notification even when the value was not changed but that also happens
in other places).

A revert of commit 108a36d07c01 ("ethtool: Fix mod state of verbose
no_mask bitset") is already in net tree as commit 524515020f25 ("Revert
"ethtool: Fix mod state of verbose no_mask bitset"").

Michal

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