[PATCH wireless v2 1/2] wifi: mac80211: Update skb's control block key in ieee80211_tx_dequeue()

[Johannes Berg]

Hi,

On Thu, 2025-07-17 at 15:21 +0200, Remi Pommarel wrote:
> I have ordered a mt7921 card so I could reproduce this and finally took
> time to debug that. 

Oh wow, talk about dedication. Thank you!

> The issue comes to the fact that mt7921 uses 802.11
> encapsulation offloading and as such we are calling
> ieee80211_tx_h_select_key() on a 802.3 frame.

Oh... Guess we could've thought about that, sorry. Though I would've
thought ath12k will also do that. Maybe not in the config you were
seeing the issue in?

> This function casts the skb data as a 802.11 header regardless the skb
> is 802.11 or not in order to decide if the info->control.hw_key needs to
> be set. So the hw_key is likely to remain NULL in ieee80211_tx_dequeue()
> and because mt7921 driver needs this key to be valid data frames are
> dropped.
> 
> Will send a patch so that ieee80211_tx_h_select_key() does not try to
> get info from a ieee80211_hdr mapped on 802.3 packet data (i.e. when
> IEEE80211_TX_CTL_HW_80211_ENCAP is set).
> 

Sounds good!

johannes