netdev - Re: [net-next PATCH v16 10/10] net: dsa: tag_mtk: add comments about Airoha usage of this TAG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <68c1376d.050a0220.2085dc.675b@mx.google.com>
Date: Wed, 10 Sep 2025 10:31:35 +0200
From: Christian Marangi <ansuelsmth@...il.com>
To: Vladimir Oltean <olteanv@...il.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Srinivas Kandagatla <srini@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"Chester A. Unal" <chester.a.unal@...nc9.com>,
	Daniel Golle <daniel@...rotopia.org>,
	DENG Qingfang <dqfext@...il.com>,
	Sean Wang <sean.wang@...iatek.com>, Simon Horman <horms@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v16 10/10] net: dsa: tag_mtk: add comments about
 Airoha usage of this TAG

On Wed, Sep 10, 2025 at 11:20:17AM +0300, Vladimir Oltean wrote:
> On Tue, Sep 09, 2025 at 02:43:41AM +0200, Christian Marangi wrote:
> > Add comments about difference between Airoha AN8855 and Mediatek tag
> > bitmap.
> > 
> > Airoha AN88555 doesn't support controlling SA learning and Leaky VLAN
> 
> Is there an extra 5 in AN88555?
> 
> > from tag. Although these bits are not used (and even not defined for
> > Leaky VLAN), it's worth to add comments for these difference to prevent
> > any kind of regression in the future if ever these bits will be used.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> >  net/dsa/tag_mtk.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/net/dsa/tag_mtk.c b/net/dsa/tag_mtk.c
> > index b670e3c53e91..ac3f956abe39 100644
> > --- a/net/dsa/tag_mtk.c
> > +++ b/net/dsa/tag_mtk.c
> > @@ -18,6 +18,9 @@
> >  #define MTK_HDR_XMIT_TAGGED_TPID_88A8	2
> >  #define MTK_HDR_RECV_SOURCE_PORT_MASK	GENMASK(2, 0)
> >  #define MTK_HDR_XMIT_DP_BIT_MASK	GENMASK(5, 0)
> > +/* AN8855 doesn't support SA_DIS and Leaky VLAN
> > + * control in tag as these bits doesn't exist.
> > + */
> 
> I think it would be good to present the AN8855 tag using a different
> string, so that libpcap knows it shouldn't decode these bits. The code
> can be reused for now.
>

Do you think I can implement 2 tagger in the same driver or do I need to
make a library of this driver? Just asking what is the correct way to
generalize it.

> >  #define MTK_HDR_XMIT_SA_DIS		BIT(6)
> >  
> >  static struct sk_buff *mtk_tag_xmit(struct sk_buff *skb,
> > -- 
> > 2.51.0
> > 
> 

-- 
	Ansuel