Netfilter "Flow offload" / HW NAT

ar71xx/ath79: with software flow offload, a TP-Link Archer C7 goes from 250 Mbps to 700 Mbps, but all instances of software-based flow offload currently break long-lived idle TCP connections. The timeout is for some reason always 120s (and ignores the net.netfilter.nf_conntrack_tcp_timeout_established sysctl value), see Software flow offloading and conntrack timeouts for a more detailed report.

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