linux-kernel - Re: [PATCH v5 net-next 1/9] net: mscc: ocelot: serialize access to the MAC table

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Date:   Sat, 25 Sep 2021 19:13:08 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Xiaoliang Yang <xiaoliang.yang_1@....com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "allan.nielsen@...rochip.com" <allan.nielsen@...rochip.com>,
        "joergen.andreasen@...rochip.com" <joergen.andreasen@...rochip.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "vinicius.gomes@...el.com" <vinicius.gomes@...el.com>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        "vishal@...lsio.com" <vishal@...lsio.com>,
        "saeedm@...lanox.com" <saeedm@...lanox.com>,
        "jiri@...lanox.com" <jiri@...lanox.com>,
        "idosch@...lanox.com" <idosch@...lanox.com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "kuba@...nel.org" <kuba@...nel.org>, Po Liu <po.liu@....com>,
        Leo Li <leoyang.li@....com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...il.com" <vivien.didelot@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "horatiu.vultur@...rochip.com" <horatiu.vultur@...rochip.com>
Subject: Re: [PATCH v5 net-next 1/9] net: mscc: ocelot: serialize access to
 the MAC table

On Fri, Sep 24, 2021 at 05:52:18PM +0800, Xiaoliang Yang wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> DSA would like to remove the rtnl_lock from its
> SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE handlers, and the felix driver uses
> the same MAC table functions as ocelot.
> 
> This means that the MAC table functions will no longer be implicitly
> serialized with respect to each other by the rtnl_mutex, we need to add
> a dedicated lock in ocelot for the non-atomic operations of selecting a
> MAC table row, reading/writing what we want and polling for completion.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---

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