This is tracking the upstream effort needed to deliver the feature request described below.

RFC1812 (4.3.2.7) mandate that "An ICMP error message MUST NOT be sent as the result of receiving... a packet destined to an IP broadcast or IP multicast address."

As of now, OVN checks packet len and, if too big, sends the packet to ovn-controller to generate an ICMP error, even for broadcast/multicast packets.

As a side effect of fixing this issue, the action in the generated flow for those multicast/broadcast packets will be much smaller, becoming something similar to

check_pkt_len(size=1514,gt(drop),le(action))

instead of

check_pkt_len(size=1514,gt(userspace(pid=4269294687,controller(reason=1,dont_send=0,continuation=0,recirc_id=1121,rule_cookie=0xb42a1191,controller_id=0,max_len=65535))),le(action)).