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 10:11:54 +0100 (CET)
From: Romain Gantois <romain.gantois@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>
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>, 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 Linus,

On Tue, 2 Jan 2024, Linus Walleij wrote:
...
> > +static inline bool stmmac_has_ip_ethertype(struct sk_buff *skb)
> > +{
> > +       __be16 proto = eth_header_parse_protocol(skb);
> 
> I made a new function for this in my patch
> https://lore.kernel.org/netdev/20231222-new-gemini-ethernet-regression-v4-2-a36e71b0f32b@linaro.org/
> 
> I was careful to add if (!pskb_may_pull(skb, ETH_HLEN)) because Eric
> was very specific about this, I suppose you could get fragment frames that
> are smaller than an ethernet header.

Okay nice, then I'll rewrite this series to use the new function once your 
changes make it in.

> Should we add an if (!pskb_may_pull(skb, ETH_HLEN)) to
> eth_header_parse_protocol()?
That does sound logical to me but I couldn't tell you what the impact on current 
callers would be. The net maintainers will probably have a better idea of this.

Best Regards,

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