netdev - Re: [PATCH v4] net: stmmac: Prevent DSA tags from breaking COE

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Date: Thu, 11 Jan 2024 15:13:52 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Romain Gantois <romain.gantois@...tlin.com>
Cc: 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>, 
	Pascal EBERHARD <pascal.eberhard@...com>, Richard Tresidder <rtresidd@...ctromag.com.au>, 
	Vladimir Oltean <olteanv@...il.com>, Andrew Lunn <andrew@...n.ch>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org, 
	Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH v4] net: stmmac: Prevent DSA tags from breaking COE

On Tue, Jan 9, 2024 at 3:42 PM Romain Gantois
<romain.gantois@...tlin.com> wrote:

> Some DSA tagging protocols change the EtherType field in the MAC header
> e.g.  DSA_TAG_PROTO_(DSA/EDSA/BRCM/MTK/RTL4C_A/SJA1105). On TX these tagged
> frames are ignored by the checksum offload engine and IP header checker of
> some stmmac cores.
>
> On RX, the stmmac driver wrongly assumes that checksums have been computed
> for these tagged packets, and sets CHECKSUM_UNNECESSARY.
>
> Add an additional check in the stmmac TX and RX hotpaths so that COE is
> deactivated for packets with ethertypes that will not trigger the COE and
> IP header checks.
>
> Fixes: 6b2c6e4a938f ("net: stmmac: propagate feature flags to vlan")
> Cc:  <stable@...r.kernel.org>
> Reported-by: Richard Tresidder <rtresidd@...ctromag.com.au>
> Link: https://lore.kernel.org/netdev/e5c6c75f-2dfa-4e50-a1fb-6bf4cdb617c2@electromag.com.au/
> Reported-by: Romain Gantois <romain.gantois@...tlin.com>
> Link: https://lore.kernel.org/netdev/c57283ed-6b9b-b0e6-ee12-5655c1c54495@bootlin.com/
> Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
> Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>

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

Yours,
Linus Walleij