linux-kernel - Re: [RFC PATCH net-next 1/5] net: bridge: add dynamic flag to switchdev notifier

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Message-ID: <20230119134045.fqdt6zrna5x3iavt@skbuf>
Date:   Thu, 19 Jan 2023 15:40:45 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     netdev@...io-technology.com
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Kanzenbach <kurt@...utronix.de>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        "maintainer:MICROCHIP KSZ SERIES ETHERNET SWITCH DRIVER" 
        <UNGLinuxDriver@...rochip.com>, Sean Wang <sean.wang@...iatek.com>,
        Landen Chao <Landen.Chao@...iatek.com>,
        DENG Qingfang <dqfext@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Clément Léger <clement.leger@...tlin.com>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:RENESAS RZ/N1 A5PSW SWITCH DRIVER" 
        <linux-renesas-soc@...r.kernel.org>,
        "moderated list:ETHERNET BRIDGE" <bridge@...ts.linux-foundation.org>
Subject: Re: [RFC PATCH net-next 1/5] net: bridge: add dynamic flag to
 switchdev notifier

On Thu, Jan 19, 2023 at 11:33:58AM +0200, Vladimir Oltean wrote:
> On Wed, Jan 18, 2023 at 11:14:00PM +0100, netdev@...io-technology.com wrote:
> > > > +	item->is_dyn = !test_bit(BR_FDB_STATIC, &fdb->flags);
> > > 
> > > Why reverse logic? Why not just name this "is_static" and leave any
> > > further interpretations up to the consumer?
> > 
> > My reasoning for this is that the common case is to have static entries,
> > thus is_dyn=false, so whenever someone uses a switchdev_notifier_fdb_info
> > struct the common case does not need to be entered.
> > Otherwise it might also break something when someone uses this struct and if
> > it was 'is_static' and they forget to code is_static=true they will get
> > dynamic entries without wanting it and it can be hard to find such an error.
> 
> I'll leave it up to bridge maintainers if this is preferable to patching
> all callers of SWITCHDEV_FDB_ADD_TO_BRIDGE such that they set is_static=true.

Actually, why would you assume that all users of SWITCHDEV_FDB_ADD_TO_BRIDGE
want to add static FDB entries? You can't avoid inspecting the code and
making sure that the is_dyn/is_static flag is set correctly either way.