netdev - NETDEV_FEAT_CHANGE and ethtool (question)

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Message-ID: <CAF0Lin3mWT_GybiXE1AihZj8iRfmQ7ahNg51SHn6BKtbitFm4A@mail.gmail.com>
Date:	Sun, 12 May 2013 12:21:45 +0300
From:	Andy Johnson <johnsonzjo@...il.com>
To:	netdev@...r.kernel.org
Subject: NETDEV_FEAT_CHANGE and ethtool (question)

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?

Best,
Andy
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