I have noticed a lot of this being spammed in my BMC dmesg logs when doing a heavy data transfer between nodes on different boards:

[197623.124726] net dsa: non-realtek ethertype 0x8808

EtherType 0x8808 is used for Ethernet flow control, which implements a "please don't send any more frames for a few microseconds so I can catch up without having to discard what you send" mechanism. I would guess the switch automatically sends this out __every__ port whenever its internal transmit queue gets (almost) full so the BMC isn't being called out specifically for being too chatty, but perhaps the BMC needs to know how to handle these requests anyway rather than spam the log.