netdev - Re: [PATCH net-next v2 01/11] net: add netdev_lock() / netdev

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Message-ID: <20250115060853.0f592332@kernel.org>
Date: Wed, 15 Jan 2025 06:08:53 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>
Cc: <netdev@...r.kernel.org>, <jiri@...nulli.us>,
 <anthony.l.nguyen@...el.com>, <edumazet@...gle.com>, <pabeni@...hat.com>,
 <andrew+netdev@...n.ch>, <horms@...nel.org>, <jdamato@...tly.com>,
 <davem@...emloft.net>
Subject: Re: [PATCH net-next v2 01/11] net: add netdev_lock() /
 netdev_unlock() helpers

On Wed, 15 Jan 2025 09:36:11 +0100 Przemek Kitszel wrote:
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index bced03fb349e..891c5bdb894c 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -2444,8 +2444,12 @@ struct net_device {
> >   	u32			napi_defer_hard_irqs;
> >   
> >   	/**
> > -	 * @lock: protects @net_shaper_hierarchy, feel free to use for other
> > -	 * netdev-scope protection. Ordering: take after rtnl_lock.
> > +	 * @lock: netdev-scope lock, protects a small selection of fields.
> > +	 * Should always be taken using netdev_lock() / netdev_unlock() helpers.
> > +	 * Drivers are free to use it for other protection.  
> 
> As with devl_lock(), would be good to specify the ordering for those who
> happen to take both. My guess is that devl_lock() is after netdev_lock()

The ordering is transitive, since devl_ is before rtnl_ there is 
no ambiguity. Or so I think :)