iwx: tag RX frames as A_MPDU RX; tag A-MSDU frames appropriately

[adrian]

Summary

• tag packets for 11n/11ac associated nodes with A_MPDU so they get passed into the reordering logic

• tag A-MSDU frames with AMSDU and AMSDU_MORE so they don't get dropped due to duplicate sequence numbers.

Note: I haven't yet elicited A-MSDU in A-MPDU to fully test this,
but I do see the net80211 reordering logic kick in (which you can
see via wlanstats -i wlan0 -o ampdu 1); so although maybe on
some firmware / hardware versions we're supposed to get fully
in-sequence RX, at least on my AX210 I'm not.

[bz]

Are you sure you are not getting full reassembled (re-aggregated) frames on your AX210 that better sees no sequence number checks in net80211 anymore?

[kevans]

Just dropping a note that this leads to ~10x throughput to pkg.f.o on my laptop -- previously averaging somewhere around ~2-3mbit/s due to constant out-of-order acks, up to ~25-30 mbit/s on average