netdev - Re: [PATCH net-next 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1 advanced 5 port switch driver

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Message-ID: <20220415124121.pls4bhfwv3azpbmf@skbuf>
Date:   Fri, 15 Apr 2022 15:41:21 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Clément Léger <clement.leger@...tlin.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Milan Stevanovic <milan.stevanovic@...com>,
        Jimmy Lalande <jimmy.lalande@...com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, netdev@...r.kernel.org,
        Jean-Pierre Geslin <jean-pierre.geslin@....se.com>,
        Phil Edworthy <phil.edworthy@...esas.com>
Subject: Re: [PATCH net-next 06/12] net: dsa: rzn1-a5psw: add Renesas RZ/N1
 advanced 5 port switch driver

On Fri, Apr 15, 2022 at 02:28:57PM +0200, Clément Léger wrote:
> > Most things as seen by a DSA switch driver are implicitly serialized by
> > the rtnl_mutex anyway. 
> 
> Is there a list of the functions that are protected by the RTNL lock
> without having to deep dive in the whole stacks ? That would be really
> useful to remove useless locking from my driver. But I guess I'll have
> to look at other drivers to see that.

No, there isn't, but in Documentation/networking/dsa/dsa.rst we do have
a list of dsa_switch_ops functions which used to be comprehensive
(but now needs to be updated again due to development that happened in
the meantime). I suppose that if you do a thorough job of documenting
the synchronization rules, you could add that information to this file.
This would be similar to how we have the "struct net_device synchronization
rules" section in Documentation/networking/netdevices.rst.