linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: avoid error message on remove from VLAN 0

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Message-ID: <1814b2e2-1a89-89f8-9699-f13df5e826b2@gmail.com>
Date:   Fri, 31 May 2019 09:34:03 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Cc:     Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        "David S. Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Marek Behún <marek.behun@....cz>,
        Russell King <rmk+kernel@...linux.org.uk>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH] net: dsa: mv88e6xxx: avoid error message on remove from
 VLAN 0

On 5/31/19 7:37 AM, Andrew Lunn wrote:
>> I'm not sure that I like the semantic of it, because the driver can actually
>> support VID 0 per-se, only the kernel does not use VLAN 0. Thus I would avoid
>> calling the port_vlan_del() ops for VID 0, directly into the upper DSA layer.
>>
>> Florian, Andrew, wouldn't the following patch be more adequate?
>>
>>     diff --git a/net/dsa/slave.c b/net/dsa/slave.c
>>     index 1e2ae9d59b88..80f228258a92 100644
>>     --- a/net/dsa/slave.c
>>     +++ b/net/dsa/slave.c
>>     @@ -1063,6 +1063,10 @@ static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
>>             struct bridge_vlan_info info;
>>             int ret;
>>      
>>     +       /* VID 0 has a special meaning and is never programmed in hardware */
>>     +       if (!vid)
>>     +               return 0;
>>     +
>>             /* Check for a possible bridge VLAN entry now since there is no
>>              * need to emulate the switchdev prepare + commit phase.
>>              */
>  
> Hi Vivien
> 
> If we put this in rx_kill_vid, we should probably have something
> similar in rx_add_vid, just in case the kernel does start using VID 0.

We use the prepare/commit model in the rx_add_vid() path so we deal with
-EOPNOTSUPP, that was caught fairly early on by Heiner when I added
programming of VLAN filtering through rx_{add,kill}_vid.

Nikita's patcha s it stands is correct and would make both
mv88e6xxx_port_check_hw_vlan() and mv88e6xxx_vtu_get() consistent.

I will respond to other comments.
-- 
Florian