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

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Date:   Thu, 22 Aug 2019 19:43:04 -0400
From:   Vivien Didelot <vivien.didelot@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, f.fainelli@...il.com,
        andrew@...n.ch
Subject: Re: [PATCH net-next 2/6] net: dsa: do not skip -EOPNOTSUPP in
 dsa_port_vid_add

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.


Thanks,

	Vivien