RE: [PATCH net v5 1/4] net: ethernet: oa_tc6: Interrupt is active low, level triggered.

[Selvamani Rajagopal]

> Subject: Re: [PATCH net v5 1/4] net: ethernet: oa_tc6: Interrupt is active low, level
> triggered.
> 
> 
> 
> Test case 2: Two LAN8651 instances on the same RPI4
> 
> Setup:
> 
> RPI4 #1 + LAN8651 (IP: 192.168.10.101) <--- RPI4 #2 + EVB-LAN8670-USB
> (IP: 192.168.10.102)
> RPI4 #1 + LAN8651 (IP: 192.168.20.101) <--- RPI4 #2 + EVB-LAN8670-USB
> (IP: 192.168.20.102)
> 
> Result:
> 

Parthiban,

It appears that we can't reproduce the crash you saw in your setup. Code has been running
all day with 5+ millions of "™Receive buffer overflow error" (Yes. I added a counter to see how 
many times, code returns EAGAIN error code)

One obvious reason is that our EVB has only one network interface. Just like your setup in Test case 1,
where you didn't see any issue.

AI review bot Sashiko suggested one potential issue where skb pointers aren't protected. But those 
concerns are in transmit path. This crash seems to be in receive path. If you think that might help,
I can generate a patch for that.

What do you suggest? Since you are able to see the crash, would you have time to investigate?

Sincerely
Selva