netdev - Re: [PATCH net v2 1/1] net: stmmac: Prevent DSA tags from breaking COE on stmmac

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Date: Wed, 3 Jan 2024 09:40:40 +0100 (CET)
From: Romain Gantois <romain.gantois@...tlin.com>
To: Florian Fainelli <f.fainelli@...il.com>
cc: Romain Gantois <romain.gantois@...tlin.com>, 
    Alexandre Torgue <alexandre.torgue@...s.st.com>, 
    Jose Abreu <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, 
    Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
    Paolo Abeni <pabeni@...hat.com>, 
    Maxime Coquelin <mcoquelin.stm32@...il.com>, 
    Miquel Raynal <miquel.raynal@...tlin.com>, 
    Maxime Chevallier <maxime.chevallier@...tlin.com>, 
    Sylvain Girard <sylvain.girard@...com>, 
    Vladimir Oltean <olteanv@...il.com>, Andrew Lunn <andrew@...n.ch>, 
    Pascal EBERHARD <pascal.eberhard@...com>, 
    Richard Tresidder <rtresidd@...ctromag.com.au>, 
    Linus Walleij <linus.walleij@...aro.org>, netdev@...r.kernel.org, 
    linux-stm32@...md-mailman.stormreply.com, 
    linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org
Subject: Re: [PATCH net v2 1/1] net: stmmac: Prevent DSA tags from breaking
 COE on stmmac

Hi Florian,

On Tue, 2 Jan 2024, Florian Fainelli wrote:

...
> > Fixes: 6b2c6e4a938f ("net: stmmac: propagate feature flags to vlan")
> > Cc: stable@...r.kernel.org
> > Reported-by: Richard Tresidder <rtresidd@...ctromag.com.au>
> > Closes:
> > https://lore.kernel.org/netdev/e5c6c75f-2dfa-4e50-a1fb-6bf4cdb617c2@electromag.com.au/
> > Reported-by: Romain Gantois <romain.gantois@...tlin.com>
> > Closes:
> > https://lore.kernel.org/netdev/c57283ed-6b9b-b0e6-ee12-5655c1c54495@bootlin.com/
> 
> Fairly sure those should be Link: and Closes: should be used for bug tracker
> entries.

ACK

> > +	return (proto == htons(ETH_P_IP)) || (proto == htons(ETH_P_IPV6)) ||
> > +		(proto == htons(ETH_P_8021Q));
> 
> Do you need to include ETH_P_8021AD in that list as well or is not stmmac
> capable of checksuming beyond a single VLAN tag?

The datasheet for my Ethernet controller doesn't mention 802.1ad tag 
handling and I ran some loopback tests that showed that this controller doesn't 
recognize 802.1ad frames as vlan frames. I also haven't seen anything in the 
stmmac driver that suggests that 802.1ad offloading is supported. Maybe the 
stmmac maintainers could weigh in on this?

Best Regards,

-- 
Romain Gantois, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com