Merge branch 'introduce-flowtable-hw-offloading-in-airoha_eth-driver'

Lorenzo Bianconi says:

====================
Introduce flowtable hw offloading in airoha_eth driver

Introduce netfilter flowtable integration in airoha_eth driver to
offload 5-tuple flower rules learned by the PPE module if the user
accelerates them using a nft configuration similar to the one reported
below:

table inet filter {
	flowtable ft {
		hook ingress priority filter
		devices = { lan1, lan2, lan3, lan4, eth1 }
		flags offload;
	}
	chain forward {
		type filter hook forward priority filter; policy accept;
		meta l4proto { tcp, udp } flow add @ft
	}
}

Packet Processor Engine (PPE) module available on EN7581 SoC populates
the PPE table with 5-tuples flower rules learned from traffic forwarded
between the GDM ports connected to the Packet Switch Engine (PSE) module.
airoha_eth driver configures and collects data from the PPE module via a
Network Processor Unit (NPU) RISC-V module available on the EN7581 SoC.
Move airoha_eth driver in a dedicated folder
(drivers/net/ethernet/airoha).

v7: https://lore.kernel.org/r/20250224-airoha-en7581-flowtable-offload-v7-0-b4a22ad8364e@kernel.org
v6: https://lore.kernel.org/r/20250221-airoha-en7581-flowtable-offload-v6-0-d593af0e9487@kernel.org
v5: https://lore.kernel.org/r/20250217-airoha-en7581-flowtable-offload-v5-0-28be901cb735@kernel.org
v4: https://lore.kernel.org/r/20250213-airoha-en7581-flowtable-offload-v4-0-b69ca16d74db@kernel.org
v3: https://lore.kernel.org/r/20250209-airoha-en7581-flowtable-offload-v3-0-dba60e755563@kernel.org
v2: https://lore.kernel.org/r/20250207-airoha-en7581-flowtable-offload-v2-0-3a2239692a67@kernel.org
v1: https://lore.kernel.org/r/20250205-airoha-en7581-flowtable-offload-v1-0-d362cfa97b01@kernel.org
====================

Link: https://patch.msgid.link/20250228-airoha-en7581-flowtable-offload-v8-0-01dc1653f46e@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>