netdev - Re: [net-next PATCH] hsr: Simplify code for announcing HSR nodes timer setup

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Message-ID: <20240429104026.0fe3de0f@kernel.org>
Date: Mon, 29 Apr 2024 10:40:26 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Lukasz Majewski <lukma@...x.de>
Cc: netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>, Casper
 Andersson <casper.casan@...il.com>, Andrew Lunn <andrew@...n.ch>, Eric
 Dumazet <edumazet@...gle.com>, Vladimir Oltean <olteanv@...il.com>, "David
 S. Miller" <davem@...emloft.net>, Oleksij Rempel <o.rempel@...gutronix.de>,
 Tristram.Ha@...rochip.com, Sebastian Andrzej Siewior
 <bigeasy@...utronix.de>, Ravi Gunasekaran <r-gunasekaran@...com>, Simon
 Horman <horms@...nel.org>, Nikita Zhandarovich <n.zhandarovich@...tech.ru>,
 Murali Karicheri <m-karicheri2@...com>, Jiri Pirko <jiri@...nulli.us>, Dan
 Carpenter <dan.carpenter@...aro.org>, Ziyang Xuan
 <william.xuanziyang@...wei.com>, Shigeru Yoshida <syoshida@...hat.com>,
 "Ricardo B. Marliere" <ricardo@...liere.net>, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH] hsr: Simplify code for announcing HSR nodes
 timer setup

On Mon, 29 Apr 2024 12:09:04 +0200 Lukasz Majewski wrote:
> > if the
> > timer is already running we'll mess with the spacing of the frames,
> > no?  
> 
> When NETDEV_CHANGE is trigger for reason different than carrier (or
> port state) change and the netif_oper_up() returns true, the period for
> HSR supervisory frames (i.e. HSR_ANNOUNCE_INTEVAL) would be violated.
> 
> What are here the potential threads?

Practically speaking I'm not sure if anyone uses any of the weird IFF_*
flags, but they are defined in uAPI (enum net_device_flags) and I don't
see much validation so presumably it's possible to flip them.