netdev - Re: Need more information on "ifi_change" in "struct ifinfomsg"

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Message-ID: <16579c2d-d0b7-179f-5381-3803118a8972@6wind.com>
Date:   Fri, 6 Sep 2019 16:55:59 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     dhan lin <dhan.lin1989@...il.com>, netdev@...r.kernel.org
Subject: Re: Need more information on "ifi_change" in "struct ifinfomsg"

Le 06/09/2019 à 07:08, dhan lin a écrit :
> Hi All,
> 
> There is a field called ifi_change in "struct ifinfomsg". man page for
> rtnetlink says its for future use and should be always set to
> 0xFFFFFFFF.
> 
> But ive run some sample tests, to confirm the value is not as per man
> pages explanation.
> Its 0 most of the times and non-zero sometimes.
> 
> I've the following question,
> 
> Is ifi_change set only when there is a state change in interface values?
ifi_change indicates which flags (ifi_flags) have changed.
It does not cover other changes.


Regards,
Nicolas