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

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Date:   Thu, 19 Oct 2023 10:34:47 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Michal Kubecek <mkubecek@...e.cz>
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 10/19/23 09:45, Michal Kubecek wrote:
> 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"").

Got it, thanks!
-- 
Florian