Re: [PATCH 1/2] mt76: mt7915: reset token when mac_reset happens

[Lorenzo Bianconi <lorenzo.bianconi@redhat.com>]

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> Reset buffering token in mt7915_mac_reset_work() to avoid possible leakege,
> which leads to Tx stop after mac reset.
> 
> Tested-by: Bo Jiao <bo.jiao@mediatek.com>
> Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
> ---
>  .../net/wireless/mediatek/mt76/mt7915/init.c  | 17 +-------------
>  .../net/wireless/mediatek/mt76/mt7915/mac.c   | 23 +++++++++++++++++++
>  .../wireless/mediatek/mt76/mt7915/mt7915.h    |  1 +
>  3 files changed, 25 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> index ff29a8090739..255ccd7e3d27 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
> @@ -672,27 +672,12 @@ int mt7915_register_device(struct mt7915_dev *dev)
>  
>  void mt7915_unregister_device(struct mt7915_dev *dev)
>  {
> -	struct mt76_txwi_cache *txwi;
> -	int id;
> -
>  	mt7915_unregister_ext_phy(dev);
>  	mt76_unregister_device(&dev->mt76);
>  	mt7915_mcu_exit(dev);
>  	mt7915_dma_cleanup(dev);
>  
> -	spin_lock_bh(&dev->token_lock);
> -	idr_for_each_entry(&dev->token, txwi, id) {
> -		mt7915_txp_skb_unmap(&dev->mt76, txwi);
> -		if (txwi->skb) {
> -			struct ieee80211_hw *hw;
> -
> -			hw = mt76_tx_status_get_hw(&dev->mt76, txwi->skb);
> -			ieee80211_free_txskb(hw, txwi->skb);
> -		}
> -		mt76_put_txwi(&dev->mt76, txwi);

it seems to me you are not using latest codebase here. I guess you are missing
the commit below:

commit 5342758d5522dbf8081360be9c8545bac84b80f3
Author: Felix Fietkau <nbd@nbd.name>
Date:   Sat Nov 21 16:00:14 2020 +0100

mt76: mt7915: stop queues when running out of tx tokens

Avoids packet drops under load with lots of stations

Regards,
Lorenzo

> -	}
> -	spin_unlock_bh(&dev->token_lock);
> -	idr_destroy(&dev->token);
> +	mt7915_tx_token_put(dev);
>  
>  	mt76_free_device(&dev->mt76);
>  }
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> index 7f08c88d3282..25623e450bc5 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
> @@ -1466,6 +1466,26 @@ mt7915_dma_reset(struct mt7915_phy *phy)
>  		 MT_WFDMA1_GLO_CFG_TX_DMA_EN | MT_WFDMA1_GLO_CFG_RX_DMA_EN);
>  }
>  
> +void mt7915_tx_token_put(struct mt7915_dev *dev);
> +{
> +	struct mt76_txwi_cache *txwi;
> +	int id;
> +
> +	spin_lock_bh(&dev->token_lock);
> +	idr_for_each_entry(&dev->token, txwi, id) {
> +		mt7915_txp_skb_unmap(&dev->mt76, txwi);
> +		if (txwi->skb) {
> +			struct ieee80211_hw *hw;
> +
> +			hw = mt76_tx_status_get_hw(&dev->mt76, txwi->skb);
> +			ieee80211_free_txskb(hw, txwi->skb);
> +		}
> +		mt76_put_txwi(&dev->mt76, txwi);
> +	}
> +	spin_unlock_bh(&dev->token_lock);
> +	idr_destroy(&dev->token);
> +}
> +
>  /* system error recovery */
>  void mt7915_mac_reset_work(struct work_struct *work)
>  {
> @@ -1506,6 +1526,9 @@ void mt7915_mac_reset_work(struct work_struct *work)
>  
>  	mt76_wr(dev, MT_MCU_INT_EVENT, MT_MCU_INT_EVENT_DMA_STOPPED);
>  
> +	mt7915_tx_token_put(dev);
> +	idr_init(&dev->token);
> +
>  	if (mt7915_wait_reset_state(dev, MT_MCU_CMD_RESET_DONE)) {
>  		mt7915_dma_reset(&dev->phy);
>  
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
> index 5bf76c74373f..3cee1cffc95e 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
> @@ -468,6 +468,7 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
>  			  struct ieee80211_sta *sta,
>  			  struct mt76_tx_info *tx_info);
>  void mt7915_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e);
> +void mt7915_tx_token_put(struct mt7915_dev *dev);
>  int mt7915_init_tx_queues(struct mt7915_phy *phy, int idx, int n_desc);
>  void mt7915_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,
>  			 struct sk_buff *skb);
> -- 
> 2.18.0
> 

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