netdev - Re: [PATCH net-next RFC 08/12] net: dsa: Remove support for bypass bridge port attributes/vlan set

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Date:   Wed, 5 Jul 2017 12:45:55 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Arkadi Sharshevsky <arkadis@...lanox.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, jiri@...nulli.us, ivecera@...hat.com,
        andrew@...n.ch, vivien.didelot@...oirfairelinux.com,
        Woojung.Huh@...rochip.com, stephen@...workplumber.org,
        mlxsw@...lanox.com
Subject: Re: [PATCH net-next RFC 08/12] net: dsa: Remove support for bypass
 bridge port attributes/vlan set

On 07/05/2017 08:36 AM, Arkadi Sharshevsky wrote:
> The bridge port attributes/vlan for DSA devices should be set only
> from bridge code. Furthermore, The vlans are synced totally with the
> bridge so there is no need for special dump support.
> 
> Signed-off-by: Arkadi Sharshevsky <arkadis@...lanox.com>

I would be more comfortable if we still had a way to dump HW entries by
calling into drivers, because it's useful for debugging, and doing that
using standard tools plus an additional flag for instance:

bridge fdb show

would dump the SW-maintained VLANs, but:

bridge fdb show hw

would dump the HW-maintained VLANs, or any flag name really, but the
point is that we can keep using a standard tool to expose debugging
features. debugfs (or something else) could be used, but was rejected by
David.

Also, technically, it ought to be possible to configure a port's VLAN
membership (although using poor semantics) through e.g: vconfig add
sw0p0 1, which would call ndo_vlan_rx_add_vid() (DSA does not support it
but mlxsw does), and so being able to dump that configuration would be
somehow helpful.
-- 
Florian