netdev - Re: [PATCH v2 net] ethtool: netlink: add missing netdev_features

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Message-ID: <20201109171834.2a66c56d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 9 Nov 2020 17:18:34 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     Alexander Lobakin <alobakin@...me>,
        "David S. Miller" <davem@...emloft.net>,
        Maxim Mikityanskiy <maximmi@...lanox.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net] ethtool: netlink: add missing
 netdev_features_change() call

On Mon, 9 Nov 2020 15:00:02 +0100 Michal Kubecek wrote:
> On Sun, Nov 08, 2020 at 12:46:15AM +0000, Alexander Lobakin wrote:
> > After updating userspace Ethtool from 5.7 to 5.9, I noticed that
> > NETDEV_FEAT_CHANGE is no more raised when changing netdev features
> > through Ethtool.
> > That's because the old Ethtool ioctl interface always calls
> > netdev_features_change() at the end of user request processing to
> > inform the kernel that our netdevice has some features changed, but
> > the new Netlink interface does not. Instead, it just notifies itself
> > with ETHTOOL_MSG_FEATURES_NTF.
> > Replace this ethtool_notify() call with netdev_features_change(), so
> > the kernel will be aware of any features changes, just like in case
> > with the ioctl interface. This does not omit Ethtool notifications,
> > as Ethtool itself listens to NETDEV_FEAT_CHANGE and drops
> > ETHTOOL_MSG_FEATURES_NTF on it
> > (net/ethtool/netlink.c:ethnl_netdev_event()).
> > 
> > From v1 [1]:
> > - dropped extra new line as advised by Jakub;
> > - no functional changes.
> > 
> > [1] https://lore.kernel.org/netdev/AlZXQ2o5uuTVHCfNGOiGgJ8vJ3KgO5YIWAnQjH0cDE@cp3-web-009.plabs.ch
> > 
> > Fixes: 0980bfcd6954 ("ethtool: set netdev features with FEATURES_SET request")
> > Signed-off-by: Alexander Lobakin <alobakin@...me>  
> 
> Reviewed-by: Michal Kubecek <mkubecek@...e.cz>

Applied, thanks!