Just to add a note, when we do something like the following, things seem
to work:

ovs-ofctl -O OpenFlow13 add-flow br-int
"table=0,priority=101,ip,ct_state=-trk,actions=ct(table=0)"

ovs-ofctl -O OpenFlow13 add-flow br-int
"table=44,priority=2003,ip,ct_nw_proto=17,ct_tp_dst=5060,ct_state=+new+trk,actions=ct(commit),normal,resubmit(,45)"

The first command in essence matches IP packets that have not yet been
tracked by conntrack, and adds various attributes around the connection
tracker. The second command then matches the connection tracker
destination port that is UDP (ct_nw_proto=17) as required.

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https://bugs.launchpad.net/bugs/2115795

Title:
  UDP fragmented packets not passing through in DPDK when destination
  port is defined

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