Problem with checksum offloading on RPi3 (PF + Jails involved)

[Carsten Bäcker]

Am 03.11.2020 um 09:46 schrieb Hans Petter Selasky:
> On 2020-11-03 09:19, Hans Petter Selasky wrote:
>> It looks like smsc(4) uses the following RX format but I don't
>> know actual RX format of H/W(no access to datasheet).
>>
>> <---------------------------- actlen
>> -------------------------------------------------->
>>                  <------------- pktlen ------------------------>
>> rxhdr(4 bytes) | padding (2 bytes) | RX frame | FCS(4 bytes) |
>> partial checksum(2 bytes)
>
> Hi,
>
> I wonder if the checksum is zero, when not valid, and that we should
> check for this in the driver!
>
> Can you try this patch?
>
> Also enabling debugging in the SMSC driver would be useful.
>
> --HPS
>
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Hi,

i applied the patch on -CURRENT but got a panic right after loading the
kernel. Most likely an unrelated problem.

But i was able to apply the patch on releng/12.2 (with an offset).
Unfortunately it doesn't change the previously described behavior with
rxcsum and i didn't manage to get any reasonable debug-output.

Since i can easily reproduce the problem. How else can i help?

Regards,
Carsten