linux-kernel - Re: [PATCH v7 net-next 3/9] net: switchdev: add support for offloading of the FDB locked flag

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Date:   Tue, 18 Oct 2022 15:47:27 +0200
From:   netdev@...io-technology.com
To:     Ido Schimmel <idosch@...dia.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        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>,
        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>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>,
        Roopa Prabhu <roopa@...dia.com>,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        Shuah Khan <shuah@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Christian Marangi <ansuelsmth@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yuwei Wang <wangyuweihx@...il.com>,
        Petr Machata <petrm@...dia.com>,
        Florent Fourcot <florent.fourcot@...irst.fr>,
        Hans Schultz <schultz.hans@...il.com>,
        Joachim Wiberg <troglobit@...il.com>,
        Amit Cohen <amcohen@...dia.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        bridge@...ts.linux-foundation.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v7 net-next 3/9] net: switchdev: add support for
 offloading of the FDB locked flag

On 2022-10-18 08:22, Ido Schimmel wrote:
> On Thu, Oct 13, 2022 at 08:58:57PM +0200, netdev@...io-technology.com 
> wrote:
>> On 2022-10-13 16:06, Ido Schimmel wrote:
>> > > diff --git a/net/dsa/port.c b/net/dsa/port.c
>> > > index e4a0513816bb..eab32b7a945a 100644
>> > > --- a/net/dsa/port.c
>> > > +++ b/net/dsa/port.c
>> > > @@ -304,7 +304,7 @@ static int dsa_port_inherit_brport_flags(struct
>> > > dsa_port *dp,
>> > >  					 struct netlink_ext_ack *extack)
>> > >  {
>> > >  	const unsigned long mask = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD |
>> > > -				   BR_BCAST_FLOOD | BR_PORT_LOCKED;
>> > > +				   BR_BCAST_FLOOD;
>> >
>> > Not sure how this is related to the patchset.
>> >
>> 
>> In general it is needed as a fix because of the way learning with 
>> locked
>> port is handled in the driver,
>> so as with MAB and also locked port in the future needing a non-zero 
>> Port
>> Association Vector (PAV)
>> for refresh etc to work, inheritance of the locked port flag is a bad 
>> idea
>> (say bug) and shouldn't have
>> been in the first place.
> 
> If it's a fix, then it needs to be submitted to 'net' tree.

It is a 'fix' for this patch set, as it changes 
mv88e6xxx_port_set_lock() to need this change.
It is not strictly necessary to change it for earlier hehaviour.