[PATCH net 0/1] Prevent DSA tags from breaking COE

[Andrew Lunn]

On Mon, Dec 18, 2023 at 05:23:22PM +0100, Romain Gantois wrote:
> Hello everyone,
> 
> This is a bugfix for an issue that was recently brought up in two
> reports:
> 
> https://lore.kernel.org/netdev/c57283ed-6b9b-b0e6-ee12-5655c1c54495@bootlin.com/
> https://lore.kernel.org/netdev/e5c6c75f-2dfa-4e50-a1fb-6bf4cdb617c2@electromag.com.au/
> 
> The Checksum Offloading Engine of some stmmac cores (e.g. DWMAC1000)
> computes an incorrect checksum when presented with DSA-tagged packets. This
> causes all TCP/UDP transfers to break when the stmmac device is connected
> to the CPU port of a DSA switch.

Probably a dumb question.... Does this COE also perform checksum
validation on receive? Is it also getting confused by the DSA header?

You must of tested receive, so it works somehow, but i just wounder if
something needs to be done to be on the safe side?

	  Andrew