netdev - netdev: operstate UNKNOWN for loopback and other devices?

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Message-ID: <20241119153703.71f97b76@hermes.local>
Date: Tue, 19 Nov 2024 15:37:03 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: netdev@...r.kernel.org
Subject: netdev: operstate UNKNOWN for loopback and other devices?

It looks like loopback and other software devices never get the operstate
set correctly. Not a serious problem, but it is incorrect.

For example:
$ ip -br link
lo               UNKNOWN        00:00:00:00:00:00 <LOOPBACK,UP,LOWER_UP> 

tap0             UNKNOWN        ca:ff:ed:bf:96:a0 <BROADCAST,PROMISC,UP,LOWER_UP> 
tap1             UNKNOWN        36:f5:16:d1:4c:15 <BROADCAST,PROMISC,UP,LOWER_UP> 

For wireless and ethernet devices kernel reports UP and DOWN correctly.

Looks like some missing bits in dev_open but not sure exactly where.