linux-kernel - Re: [PATCH net-next v3 5/8] net: dsa: vsc73xx: Add vlan filtering

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Date:   Wed, 4 Oct 2023 00:27:54 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Paweł Dembicki <paweldembicki@...il.com>
Cc:     netdev@...r.kernel.org, Dan Carpenter <dan.carpenter@...aro.org>,
        Simon Horman <simon.horman@...igine.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 5/8] net: dsa: vsc73xx: Add vlan filtering

On Tue, Oct 03, 2023 at 11:14:55PM +0200, Paweł Dembicki wrote:
> Should I make a local copy of the quantity of egress untagged and
> tagged vlans per port to resolve this issue, shouldn't I?
> And then I check how many vlans are egress tagged or untagged for a
> properly restricted solution?

Yeah, I guess so. It is the same problem that ocelot_vlan_prepare()
tries to solve, and that counts ocelot_port_num_untagged_vlans() and
ocelot_port_num_tagged_vlans() indeed.

> I see another problem. Even if I return an error value, the untagged
> will be marked in 'bridge vlan' listing. I'm not sure how it should
> work in this case.

What error code are you returning, -EOPNOTSUPP I guess? That's
deliberately ignored by callers of br_switchdev_port_vlan_add(), because
it means "no one responded to the switchdev notifier, so the VLAN is not
offloaded". If you want to deny the configuration you need to return
something else, like -EBUSY.