linux-kernel - Re: [RFC net-next] net: dsa: rtl8366rb: support bridge offloading

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Message-ID: <CACRpkdZW1oWx-gnRO7gBuOM9dO23r+iifQRm1-M8z4Ms8En9cw@mail.gmail.com>
Date:   Tue, 2 Mar 2021 17:05:00 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     DENG Qingfang <dqfext@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        netdev <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC net-next] net: dsa: rtl8366rb: support bridge offloading

On Tue, Mar 2, 2021 at 4:58 AM DENG Qingfang <dqfext@...il.com> wrote:
> On Mon, Mar 1, 2021 at 9:48 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> > With my minor changes:
> > Tested-by: Linus Walleij <linus.walleij@...aro.org>
>
> How about using a mutex lock in port_bridge_{join,leave} ?
> In my opinion all functions that access multiple registers should be
> synchronized.

That's one way, in some cases the framework (DSA) serialize
the accesses so I don't know if that already happens on a
higher level? Since it is accessed over a slow bus we should go
for mutex in that case indeed.

Yours,
Linus Walleij