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From: Vladimir Oltean <olteanv@gmail.com>
To: DENG Qingfang <dqfext@gmail.com>
Cc: Sean Wang <sean.wang@mediatek.com>,
	Landen Chao <Landen.Chao@mediatek.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Florian Fainelli <f.fainelli@gmail.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC net-next 2/2] net: dsa: tag_mtk: handle VLAN tag insertion on TX
Date: Thu, 26 Aug 2021 17:13:26 +0300	[thread overview]
Message-ID: <20210826141326.xa52776uh3r3jpg4@skbuf> (raw)
In-Reply-To: <20210826052956.3101243-1-dqfext@gmail.com>

On Thu, Aug 26, 2021 at 01:29:56PM +0800, DENG Qingfang wrote:
> On Thu, Aug 26, 2021 at 03:03:49AM +0300, Vladimir Oltean wrote:
> > 
> > You cannot just remove the old code. Only things like 8021q uppers will
> > send packets with the VLAN in the hwaccel area.
> > 
> > If you have an application that puts the VLAN in the actual AF_PACKET
> > payload, like:
> > 
> > https://github.com/vladimiroltean/tsn-scripts/blob/master/isochron/send.c
> > 
> > then you need to handle the VLAN being in the skb payload.
> 
> I've actually tested this (only apply patch 2 without .features) and it
> still worked.
> 
> The comment says the VLAN tag need to be combined with the special tag in
> order to perform VLAN table lookup,

It does say this.

> so we can set its destination port vector to all zeroes and the switch
> will forward it like a data frame (TX forward offload),

And it does not say this. So this is supported after all with mt7530?
Are you looking to add support for that?

> but as we allow multiple bridges which are either VLAN-unaware or
> VLAN-aware with the same VID, there is no way to determine the
> destination bridge unless we maintain some VLAN translation mapping.

What does "VLAN translation mapping" mean, practically?
Other drivers which cannot remap VIDs to internal VLANs just restrict a
single VLAN-aware bridge, and potentially multiple VLAN-unaware ones.

  parent reply	other threads:[~2021-08-26 14:13 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-25  8:38 [RFC net-next 0/2] DSA slave with customise netdev features DENG Qingfang
2021-08-25  8:38 ` [RFC net-next 1/2] net: dsa: allow taggers to " DENG Qingfang
2021-08-26  0:01   ` Vladimir Oltean
2021-08-26 11:28   ` Florian Fainelli
2021-08-25  8:38 ` [RFC net-next 2/2] net: dsa: tag_mtk: handle VLAN tag insertion on TX DENG Qingfang
2021-08-26  0:03   ` Vladimir Oltean
2021-08-26  5:29     ` DENG Qingfang
2021-08-26 11:37       ` Florian Fainelli
2021-08-26 14:13       ` Vladimir Oltean [this message]
2021-08-26 15:27         ` DENG Qingfang
2021-08-26  0:00 ` [RFC net-next 0/2] DSA slave with customise netdev features Vladimir Oltean

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