Re: [PATCH 2/2] wifi: ath12k: Introduce the container for mac80211 hw

[Kalle Valo <kvalo@kernel.org>]

Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:

> To support multi link operation, we need to combine all the link/pdev
> under a single wiphy. This avoids the overhead of synchronization
> across multiple hardware instances in both the cfg80211 and mac80211
> layers. Currently, each link/pdev is registered as separate wiphy,
> tightly coupled with link/pdev/radio (ar) structure. To enable single
> wiphy registration within the chip, we decouple the wiphy data entity from
> the link/pdev/radio (ar) structure and move it under the chip (ab)
> structure with a new data container (ath12k_hw) structure. This approach
> improves scalability for future multi link operation support.
>
> 		mac80211 hw private data structure diagram
> 		------------------------------------------
>
> 	Now						After
>
>  +---------------------+                          +---------------------+
>  |mac80211 hw priv data|                          |mac80211 hw priv data|
>  |                     |                          |                     |
>  |                     |                          |                     |
>  |                     |                          |                     |
>  |                     |                          |   ath12k_hw (ah)    |
>  |                     |                          |                     |
>  |                     |  +------------------->   |                     |
>  |    ath12k (ar)      |                          |   +-------------+   |
>  |                     |                          |   |             |   |
>  |                     |                          |   | ath12k (ar) |   |
>  |                     |                          |   |             |   |
>  |                     |                          |   |             |   |
>  |                     |                          |   +-------------+   |
>  |                     |                          |                     |
>  |                     |                          |                     |
>  +---------------------+                          +---------------------+
>
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
> Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
>
> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>

[...]

> @@ -3790,6 +3831,10 @@ static int ath12k_mac_op_sta_state(struct ieee80211_hw *hw,
>  	     new_state == IEEE80211_STA_NOTEXIST))
>  		cancel_work_sync(&arsta->update_wk);
>  
> +	mutex_lock(&ah->conf_mutex);
> +
> +	ar = ath12k_ah_to_ar(ah);
> +
>  	mutex_lock(&ar->conf_mutex);

Do we really need two mutexes? I don't see any analysis about that. And
even if we do, I feel that it should be added in a separate patch.

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