netdev - Re: NETDEV_FEAT_CHANGE and ethtool (question)

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Message-ID: <CAHXqBFKwFtM03jg_UqbpHqg2fod_R2gYBHPqJ9YQMmE=ZF68Hw@mail.gmail.com>
Date:	Sun, 12 May 2013 21:18:46 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	Andy Johnson <johnsonzjo@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: NETDEV_FEAT_CHANGE and ethtool (question)

2013/5/12 Andy Johnson <johnsonzjo@...il.com>:
> Hello,
>
> The only thing that netdev_features_change() does is send
> NETDEV_FEAT_CHANGE event
> notification.
>
> NETDEV_FEAT_CHANGE event is sent in the core from
> netdev_update_features() if __netdev_update_features returned 1, and
> this event is *always* sent from netdev_change_features().
>
> ethtool calls __netdev_update_features() when chaning features. So
> changing GSO offload features for example, by
> "ethtool -K gso off" will *not* trigger NETDEV_FEAT_CHANGE event notification.
> (assuming that ndo_fix_features/ndo_set_features callbacks of the
> driver, if exist, will not
> trigger such noticiation call).
>
> My question is: why changing features by ethtool does not trigger
> sending NETDEV_FEAT_CHANGE event?

You didn't verify this assumption. See dev_ethtool()'s last check.

Best Regards,
Michał Mirosław
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