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Date:   Tue, 10 Oct 2023 17:19:03 +0200
From:   Simon Horman <horms@kernel.org>
To:     =?utf-8?B?S8O2cnk=?= Maincent <kory.maincent@bootlin.com>
Cc:     Michal Kubecek <mkubecek@suse.cz>,
        "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Maxime Chevallier <maxime.chevallier@bootlin.com>,
        thomas.petazzoni@bootlin.com, Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Subject: Re: [PATCH net v3 1/1] ethtool: Fix mod state of verbose no_mask
 bitset
Message-ID: <ZSVrZ9fIP62RLQpY@kernel.org>
References: <20231009133645.44503-1-kory.maincent@bootlin.com>
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On Mon, Oct 09, 2023 at 03:36:45PM +0200, Köry Maincent wrote:
> From: Kory Maincent <kory.maincent@bootlin.com>
> 
> A bitset without mask in a _SET request means we want exactly the bits in
> the bitset to be set. This works correctly for compact format but when
> verbose format is parsed, ethnl_update_bitset32_verbose() only sets the
> bits present in the request bitset but does not clear the rest. The commit
> 6699170376ab fixes this issue by clearing the whole target bitmap before we
> start iterating. The solution proposed brought an issue with the behavior
> of the mod variable. As the bitset is always cleared the old val will
> always differ to the new val.
> 
> Fix it by adding a new temporary variable which save the state of the old
> bitmap.
> 
> Fixes: 6699170376ab ("ethtool: fix application of verbose no_mask bitset")
> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
> ---
> 
> Changes in v2:
> - Fix the allocated size.
> 
> Changes in v3:
> - Add comment.
> - Updated variable naming.
> - Add orig_bitmap variable to avoid n_mask condition in the
>   nla_for_each_nested() loop.

Hi Köry,

thanks for the updates. This one looks good to me.

Reviewed-by: Simon Horman <horms@kernel.org>