netdev - Re: [PATCH v2 net-next 4/4] Revert "net: dsa: Add more convenient functions for installing port VLANs"

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Date:   Fri, 11 Sep 2020 20:30:26 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     jakub.kicinski@...ronome.com, davem@...emloft.net, andrew@...n.ch,
        vivien.didelot@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 4/4] Revert "net: dsa: Add more convenient
 functions for installing port VLANs"

On Thu, Sep 10, 2020 at 12:52:03PM -0700, Florian Fainelli wrote:
> On 9/10/2020 9:48 AM, Vladimir Oltean wrote:
> > From: Vladimir Oltean <vladimir.oltean@....com>
> >
> > This reverts commit 314f76d7a68bab0516aa52877944e6aacfa0fc3f.
> >
> > Citing that commit message, the call graph was:
> >
> >      dsa_slave_vlan_rx_add_vid   dsa_port_setup_8021q_tagging
> >                  |                        |
> >                  |                        |
> >                  |          +-------------+
> >                  |          |
> >                  v          v
> >                 dsa_port_vid_add      dsa_slave_port_obj_add
> >                        |                         |
> >                        +-------+         +-------+
> >                                |         |
> >                                v         v
> >                             dsa_port_vlan_add
> >
> > Now that tag_8021q has its own ops structure, it no longer relies on
> > dsa_port_vid_add, and therefore on the dsa_switch_ops to install its
> > VLANs.
> >
> > So dsa_port_vid_add now only has one single caller. So we can simplify
> > the call graph to what it was before, aka:
> >
> >          dsa_slave_vlan_rx_add_vid     dsa_slave_port_obj_add
> >                        |                         |
> >                        +-------+         +-------+
> >                                |         |
> >                                v         v
> >                             dsa_port_vlan_add
> >
> > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
>
> I would be keen on keeping this function just because it encapsulates the
> details of creating the switchdev object and it may be useful to add
> additional functionality later on (like the DSA master RX VLAN filtering?),
> but would not object to its removal if others disagree.
> --
> Florian

Hmm, I don't think there's a lot of value in having it, it's confusing
to have such a layered call stack, and it shouldn't be an exported
symbol any longer in any case.
Also, I already have a patch that calls vlan_vid_add(master) and having
this dsa_port_vid_add() helper doesn't save much at all.

Thanks,
-Vladimir