linux-kernel - Re: [PATCH RFC v1 net-next] net: ethernet: mtk_ppe

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Message-ID: <5de748b1-5963-495e-ab90-6453c1707c39@gmail.com>
Date: Tue, 15 Oct 2024 17:24:44 +0200
From: Eric Woudstra <ericwouds@...il.com>
To: Simon Horman <horms@...nel.org>
Cc: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
 Mark Lee <Mark-MC.Lee@...iatek.com>, Lorenzo Bianconi <lorenzo@...nel.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Frank Wunderlich <frank-w@...lic-files.de>,
 Daniel Golle <daniel@...rotopia.org>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH RFC v1 net-next] net: ethernet: mtk_ppe_offload: Allow
 QinQ

On 10/14/24 10:51 AM, Simon Horman wrote:
> On Sun, Oct 13, 2024 at 08:50:56PM +0200, Eric Woudstra wrote:
>> mtk_foe_entry_set_vlan() in mtk_ppe.c already seems to support
>> double vlan tagging, but mtk_flow_offload_replace() in
>> mtk_ppe_offload.c only allows for 1 vlan tag, optionally in
>> combination with pppoe and dsa tags.
>>
>> This patch adds QinQ support to mtk_flow_offload_replace().
>>
>> Only PPPoE-in-Q (as before) and Q-in-Q are allowed. A combination
>> of PPPoE and Q-in-Q is not allowed.
>>
>> As I do not have any documentation of the ppe hardware, I do not
>> know if there is any other reason to not implement Q-in-Q in
>> mtk_flow_offload_replace().
>>
>> Tested on the BPI-R3(mini), on non-dsa-ports and dsa-ports.
>>
>> Signed-off-by: Eric Woudstra <ericwouds@...il.com>
> 
> Hi Eric,
> 
> I see that this patch supports up to two VLANs, both with EtherType 0x8100.
> And assuming that is supported by the hardware, that seems fine to me.
> 
> But I winder if you know if this hardware supports other VLAN EtherTypes,
> such as  0x88a8 which is described in 802.1ad?

Hello Simon,

The issue is that I do not have the documentation. Therefore I submit
this patch as RFC and I hope someone at mediatek or so can confirm we can
implement QinQ as in this patch on all hardware that uses mtk_ppe_offload.

But it does not look like it supports 0x88a8 from 802.1ad.