[PATCH net-next 01/10] net: stmmac: fix TSO support when some channels have TBS available

[Andrew Lunn]

>          * Packets that won't trigger the COE e.g. most DSA-tagged packets will
>          * also have to be checksummed in software.
>          */

I doubt DSA will work with TSO, it would have to include the DSA
header into the replicated header when doing segmentation.

I thought we had some code in DSA to turn off features which are
likely to cause issues. But i don't see it.

Hardware checksumming has been an issue in the past with DSA. Some MAC
hardware from switch vendors, Marvell, Broadcom etc, understand the
DSA header and so can do the checksum correctly when the DSA tag is
present. MAC hardware from other vendors often get confused so
software checksumming is needed.

	 Andrew