[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 - Hao Cheng (tkit1994)

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How can I add wlan0 and wlan1 to flowtable devices?
I can successfully add lan1 and lan2. But if I add wlan0 or wlan1 to it, the following error appears:


/tmp/nftables.nft:4:12-13: Error: Could not process rule: Not supported
	flowtable ft {
	          ^^
/tmp/nftables.nft:22:29-40: Error: Could not process rule: No such file or directory
		meta l4proto { tcp, udp } flow add @ft
 

Here is part of my nftables rule.

root at OpenWrt:~# cat /tmp/nftables.nft
flush ruleset

table inet fw4 {
	flowtable ft {
		hook ingress priority filter;
		devices = { wan, lan1, lan2, wlan0};
		flags offload;
	}

	chain input {
		type filter hook input priority filter; policy accept;
		iifname "lo" accept comment "!fw4: Accept traffic from loopback"
		ct state established,related accept comment "!fw4: Allow inbound established and related flows"
		ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
		tcp flags syn / fin,syn,rst,ack jump syn_flood comment "!fw4: Rate limit TCP syn packets"
		iifname "br-lan" jump input_lan comment "!fw4: Handle lan IPv4/IPv6 input traffic"
		iifname "wan" jump input_wan comment "!fw4: Handle wan IPv4/IPv6 input traffic"
	}

	chain forward {
		type filter hook forward priority filter; policy drop;
		meta l4proto { tcp, udp } flow add @ft
		ct state established,related accept comment "!fw4: Allow forwarded established and related flows"
		ct state invalid drop comment "!fw4: Drop flows with invalid conntrack state"
		iifname "br-lan" jump forward_lan comment "!fw4: Handle lan IPv4/IPv6 forward traffic"
		iifname "wan" jump forward_wan comment "!fw4: Handle wan IPv4/IPv6 forward traffic"
		jump handle_reject
	}


My device is mir3g with mt7621. 
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4239#comment10488

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