I recently ran into an issue where too much offered load to the radio would cause the entire 100G link to become unresponsive, but dmesg didn't show that the link actually went down. I could not ping the interface (Destination unreachable) and packets stopped flowing through the interface from the host machine. Reseating the cable worked, but I need to figure out why the port stopped responding in the first place.
I see in the eth_100g that there is a generic to enable pause frames to be generated: https://github.com/EttusResearch/uhd/blob/master/fpga/usrp3/top/x400/ip/eth_100g_bd/eth_100g.sv#L12 ... and I also see in eth_ipv4_interface that there are some dropped counters: https://github.com/EttusResearch/uhd/blob/master/fpga/usrp3/lib/rfnoc/xport_sv/eth_ipv4_interface.sv#L278 But in the host code, I can't find where they might be able to be read out. So I assume that dropping packets is well supported in the code, and that the interface should never become unresponsive. Any insights on where to read those counters, or do I need to hook an ILA up to it? Any idea if the interface can run with the PAUSE_EN parameter set to 0? I don't want to slow the link down, and I'd rather drop things in the radio itself. I just need to be able to know when and how often it's happening. Thanks in advance. Brian
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