Re: [PATCH v2 2/2] net: dsa: tag_ksz: dont let the hardware process the layer 4 checksum
From: Vladimir Oltean <olteanv@gmail.com>
Date: 2021-07-21 23:37:52
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On Wed, Jul 21, 2021 at 11:56:42PM +0200, Lino Sanfilippo wrote:
If the checksum calculation is offloaded to the network device (e.g due to NETIF_F_HW_CSUM inherited from the DSA master device), the calculated layer 4 checksum is incorrect. This is since the DSA tag which is placed after the layer 4 data is considered as being part of the daa and thus errorneously included into the checksum calculation. To avoid this, always calculate the layer 4 checksum in software. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> ---
Fixes: 8b8010fb7876 ("dsa: add support for Microchip KSZ tail tagging")
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>