[FS#4239] flow_offloading_hw doesn't work with nftables (mt7621)

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FS#4239 - flow_offloading_hw doesn't work with nftables (mt7621)
User who did this - amaumene (amaumene)

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In terms of performances I did a quick and simple test. This has been done with a RB760iGS as router a one Raspberry Pi 4 on each side:
Hardware offload:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-30.00  sec  2.74 GBytes   785 Mbits/sec  378             sender
[  5]   0.00-30.00  sec  2.74 GBytes   784 Mbits/sec                  receiver
Software offload:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-30.00  sec  2.54 GBytes   727 Mbits/sec  474             sender
[  5]   0.00-30.00  sec  2.54 GBytes   726 Mbits/sec                  receiver
No offload:
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-30.01  sec  2.59 GBytes   742 Mbits/sec  447             sender
[  5]   0.00-30.00  sec  2.59 GBytes   742 Mbits/sec                  receiver

Software offload would be slower? I've ran iperf with these options: "-R -Z -t 30 -O 3" on the client side (behind NAT).
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4239#comment10481

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