netdev - Re: [PATCH net-next 2/6] net: dsa: do not skip -EOPNOTSUPP in dsa_port_vid

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Date:   Fri, 23 Aug 2019 02:44:49 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Vivien Didelot <vivien.didelot@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 2/6] net: dsa: do not skip -EOPNOTSUPP in dsa_port_vid_add

On Fri, 23 Aug 2019 at 02:43, Vivien Didelot <vivien.didelot@...il.com> wrote:
>
> Hi Vladimir,
>
> On Fri, 23 Aug 2019 01:06:58 +0300, Vladimir Oltean <olteanv@...il.com> wrote:
> > Hi Vivien,
> >
> > On 8/22/19 11:13 PM, Vivien Didelot wrote:
> > > Currently dsa_port_vid_add returns 0 if the switch returns -EOPNOTSUPP.
> > >
> > > This function is used in the tag_8021q.c code to offload the PVID of
> > > ports, which would simply not work if .port_vlan_add is not supported
> > > by the underlying switch.
> > >
> > > Do not skip -EOPNOTSUPP in dsa_port_vid_add but only when necessary,
> > > that is to say in dsa_slave_vlan_rx_add_vid.
> > >
> >
> > Do you know why Florian suppressed -EOPNOTSUPP in 061f6a505ac3 ("net:
> > dsa: Add ndo_vlan_rx_{add, kill}_vid implementation")?
> > I forced a return value of -EOPNOTSUPP here and when I create a VLAN
> > sub-interface nothing breaks, it just says:
> > RTNETLINK answers: Operation not supported
> > which IMO is expected.
>
> I do not know what you mean. This patch does not change the behavior of
> dsa_slave_vlan_rx_add_vid, which returns 0 if -EOPNOTSUPP is caught.
>

Yes, but what's wrong with just forwarding -EOPNOTSUPP?

>
> Thanks,
>
>         Vivien