How to configure/access Cyclone V HPS EMAC counters.

I want to reiterate, as clearly as I can, that the registers are set exactly the same for EMAC0 and EMAC1. The same code is used to initialize both; the only difference is the base address passed in, essentially.

I, too, I have tried various settings and I do see that the register get reset to 0 if that setting is set. But then it never counts as I stream packets. It will increase if an ARP happens. But not if I send IP packets.

I see that Linux uses the reset on read (presumably because the counters are 64-bit yet the EMAC counters are 32 so that's how they deal with potential overflow). But there you are.

I will do another test with Linux on Monday. I do believe that I saw valid counts for IP packets, but I will try sending packets with errors to see if they get counted. It could be that the Linux implementation is not actually using the MAC counters but the stack; if that's the case, it will not see errors that the MAC will throw out so that will be telling.

My analysis of the Linux drivers is that they do nothing differently than what I am doing, myself.