why DPDK reassembles IP fragment packets with AF_PACKET

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Hi All,


Recently I debug ovs-dpdk with AF_PACKET mode.  When IP fragment packets are received via DPDK, the IP fragment packets are reassembled by DPDK. After reassembly, the packet length is over 1518. They are discarded by OVS because of oversize packets.


I don't understandy why  PACKET_FLAG_DEFRAG is set for AF_PACKET mode.


Can you help explain design at your convenience?


I would appreciate your kindly help.


Best regards,


Matthew
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