Re: [PATCH net-next 3/6] net: dsa: vsc73xx: Add dsa tagging based on 8021q

[Linus Walleij]

On Wed, Jun 21, 2023 at 9:14 PM Pawel Dembicki <paweldembicki@xxxxxxxxx> wrote:

> This patch is simple implementation of 8021q tagging in vsc73xx driver.
> At this moment devices with DSA_TAG_PROTO_NONE are useless. VSC73XX
> family doesn't provide any tag support for external ethernet ports.
>
> The only way is vlan-based tagging. It require constant hardware vlan
> filtering. VSC73XX family support provider bridging but QinQ only without
> fully implemented 802.1AD. It allow only doubled 0x8100 TPID.
>
> In simple port mode QinQ is enabled to preserve forwarding vlan tagged
> frames.
>
> Tag driver introduce most simple funcionality required for proper taging
> support.
>
> Signed-off-by: Pawel Dembicki <paweldembicki@xxxxxxxxx>

>From my point of view it is the best we can do.
Admittedly I do not understand the implications of using the 802.1
tagging for this, so I leave that to the experts to review.

Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij