On 05.04.21 18:42, Andrew Lunn wrote:
Have you looked at where it actually drops the packet?
Is it one of
https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/stmicro/stmmac/norm_desc.c#L95
or
https://elixir.bootlin.com/linux/latest/source/drivers/net/ethernet/stmicro/stmmac/enh_desc.c#L87
It could be, you need to see if the checksum has fail, then check if
the checksum is actually zero, and then go deeper into the frame and
check if it is a vxlan frame. It could be the linux software checksum
code knows about this vxlan exception, so you can just run that before
deciding to drop the frame.
Andrew
No, I've not yet checked where the packet is actually dropped. This is
my first time debugging a network problem in the kernel and I have
little to no knowledge how this rx offloading works. But I don't think
it happens in norm_desc.c#L95 as I would expect the ipc_csum_error
counter to increase. But the only counters in "ethtool -S" which are
increasing are mmc_rx_udp_err and mmc_rx_udp_err_octets. I'll try to get
more information.
Julian
