Feature request: DSCP to WMM queue mapping support for MT7986 + MT7915 (mt76) – GL.iNet GL-MT6000

Hi,
I’d like to request support for DSCP-to-WMM queue mapping on MediaTek MT7986 and MT7915-based devices using the mt76 driver.

Device:
Router: GL.iNet GL-MT6000
Platform: MediaTek MT7986 (Filogic 830)
Wi-Fi: MT7915 (5 GHz) + integrated 2.4 GHz
OpenWrt Version: 24.10
Motivation:
The chipsets support multiple hardware TX queues (tested: 16 queues on eth1), but currently, the mt76 driver does not honor DSCP markings for queue selection.

In OpenWrt (using firewall4/nftables), we can assign DSCP classes like CS6 (games), CS1 (bulk), AF41 (system), but these do not translate into different WMM queues on Wi-Fi or Ethernet.

Why it matters:
We want to use hardware offloading (flow_offloading + flow_offloading_hw) and still benefit from QoS prioritization — without disabling offloading.

Having DSCP mapped to queues allows:

prioritizing latency-sensitive traffic (games, VoIP),
while keeping high-speed flows (e.g. downloads) at lower priority,
and preserving full throughput.
Feature Request:
Please consider:

Adding support in mt76 for mapping DSCP → WMM queue,
Optionally also exposing skb->priority or skb->mark mapping for queue selection,
Supporting both wireless and Ethernet TX path if applicable.
Bonus:
Happy to provide:

tc / ethtool / nftables configs,
logs or packet captures from OpenWrt,
testing assistance if needed.
Thanks for the awesome work on mt76!

Start by locating the mt76 driver’s transmit queue-selection path and reviewing how mac80211 handles DSCP, skb priority, and WMM queues. Compare this with the issue’s nftables DSCP classes and flow_offloading_hw setup; done means a defined, tested mapping for the MT7986/MT7915 wireless path, with Ethernet scope clarified.