Agilex 5 EMAC GMII loopthrough: signals are not toggling in Fabric

hi,

thank you for the clarifications.

If ping works and you can see the signals toggling, i believe the loopback design is working from hardware perspective. The original issue for the discussion is actually solved right?

For the arping timeout. I believe we need to investigate from Linux.

From your screenshot, i can see that the tx packet from cat /proc/net/dev actually increased. I am not sure if the increment from 68 to 73 for tx is due to the arping. Could you please help to check that?

If the answer is yes, maybe there are configurations needed to handle looped ARP packets.

These are the things that i have found to bypass some checks in linux:

echo 1 > /proc/sys/net/ipv4/conf/eth1/accept_local

echo 1 > /proc/sys/net/ipv4/conf/eth1/arp_ignore

echo 1 > /proc/sys/net/ipv4/conf/eth1/rp_filter

Here are the commands that you can use to debug further:

tcpdump -i eth1 -e -vv