rtwn: set M_AMPDU on received frames on 11n and later stations

[adrian]

Summary

• the driver is configured to announce 11n AMPDU TX/RX;
• the firmware is happily doing A-MPDU de-aggregation for us;
• but since we aren't tagging the frames as A-MPDU in the receive path, it won't ever go through the RX reorder path!

This leads to some pretty terrible out of order receive behaviour
leading to a lot of receive frame drops.

Receive traffic now behaves a /lot/ better now that AMPDU RX is enabled.

Local testing:

• RTL8811AU, USB NIC, STA mode

[adrian]

add URL

[bz]

sys/dev/rtwn/pci/rtwn_pci_rx.c

165

rtwn_rx_common() from a few lines above does that already.

sys/dev/rtwn/usb/rtwn_usb_rx.c

415

rtwn_rx_common() via rtwn_rx_frame() a few lines above does that already.

[adrian]

oh, good catch!

weird, i wonder why i saw the behaviour change. lemme dig into it a bit, thanks.

[adrian]

ok, something else is going on, stay tuned