Re: [PATCH 1/3] mt76: sdio: remove those unnecessary buffers in sdio.xmit_buf

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

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> From: Sean Wang <sean.wang@mediatek.com>
> 
> We don't have to create a separate sdio.xmit_buf buffer for each queue.
> Instead, we just need to create one, reuse it across all queues to reduce
> memory consumption further.
> 
> Signed-off-by: Sean Wang <sean.wang@mediatek.com>
> ---
>  drivers/net/wireless/mediatek/mt76/mt76.h        |  2 +-
>  drivers/net/wireless/mediatek/mt76/mt7615/sdio.c | 15 ++++++---------
>  drivers/net/wireless/mediatek/mt76/mt7921/sdio.c | 15 ++++++---------
>  drivers/net/wireless/mediatek/mt76/sdio_txrx.c   | 15 ++++++---------
>  4 files changed, 19 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
> index 14f60fcb6a34..4029a2217397 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt76.h
> +++ b/drivers/net/wireless/mediatek/mt76/mt76.h
> @@ -507,7 +507,7 @@ struct mt76_sdio {
>  
>  	struct work_struct stat_work;
>  
> -	u8 *xmit_buf[IEEE80211_NUM_ACS + 2];
> +	u8 *xmit_buf;
>  
>  	struct sdio_func *func;
>  	void *intr_data;
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/sdio.c b/drivers/net/wireless/mediatek/mt76/mt7615/sdio.c
> index 71162befdae8..554160b0ea9a 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/sdio.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/sdio.c
> @@ -101,7 +101,7 @@ static int mt7663s_probe(struct sdio_func *func,
>  	struct ieee80211_ops *ops;
>  	struct mt7615_dev *dev;
>  	struct mt76_dev *mdev;
> -	int i, ret;
> +	int ret;
>  
>  	ops = devm_kmemdup(&func->dev, &mt7615_ops, sizeof(mt7615_ops),
>  			   GFP_KERNEL);
> @@ -140,14 +140,11 @@ static int mt7663s_probe(struct sdio_func *func,
>  		goto error;
>  	}
>  
> -	for (i = 0; i < ARRAY_SIZE(mdev->sdio.xmit_buf); i++) {
> -		mdev->sdio.xmit_buf[i] = devm_kmalloc(mdev->dev,
> -						      MT76S_XMIT_BUF_SZ,
> -						      GFP_KERNEL);
> -		if (!mdev->sdio.xmit_buf[i]) {
> -			ret = -ENOMEM;
> -			goto error;
> -		}
> +	mdev->sdio.xmit_buf = devm_kmalloc(mdev->dev, MT76S_XMIT_BUF_SZ,
> +					   GFP_KERNEL);
> +	if (!mdev->sdio.xmit_buf) {
> +		ret = -ENOMEM;
> +		goto error;
>  	}

I guess we can move buffer allocation in mt76s_init() and remove duplicated
code in mt7663/mt7921.

Reagards,
Lorenzo

>  
>  	ret = mt76s_alloc_rx_queue(mdev, MT_RXQ_MAIN);
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c
> index 743b63f66efa..c58c14e28430 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7921/sdio.c
> @@ -121,7 +121,7 @@ static int mt7921s_probe(struct sdio_func *func,
>  
>  	struct mt7921_dev *dev;
>  	struct mt76_dev *mdev;
> -	int ret, i;
> +	int ret;
>  
>  	mdev = mt76_alloc_device(&func->dev, sizeof(*dev), &mt7921_ops,
>  				 &drv_ops);
> @@ -154,14 +154,11 @@ static int mt7921s_probe(struct sdio_func *func,
>  		goto error;
>  	}
>  
> -	for (i = 0; i < ARRAY_SIZE(mdev->sdio.xmit_buf); i++) {
> -		mdev->sdio.xmit_buf[i] = devm_kmalloc(mdev->dev,
> -						      MT76S_XMIT_BUF_SZ,
> -						      GFP_KERNEL);
> -		if (!mdev->sdio.xmit_buf[i]) {
> -			ret = -ENOMEM;
> -			goto error;
> -		}
> +	mdev->sdio.xmit_buf = devm_kmalloc(mdev->dev, MT76S_XMIT_BUF_SZ,
> +					   GFP_KERNEL);
> +	if (!mdev->sdio.xmit_buf) {
> +		ret = -ENOMEM;
> +		goto error;
>  	}
>  
>  	ret = mt76s_alloc_rx_queue(mdev, MT_RXQ_MAIN);
> diff --git a/drivers/net/wireless/mediatek/mt76/sdio_txrx.c b/drivers/net/wireless/mediatek/mt76/sdio_txrx.c
> index 488ad7734d85..a04cd2444247 100644
> --- a/drivers/net/wireless/mediatek/mt76/sdio_txrx.c
> +++ b/drivers/net/wireless/mediatek/mt76/sdio_txrx.c
> @@ -229,12 +229,11 @@ static int __mt76s_xmit_queue(struct mt76_dev *dev, u8 *data, int len)
>  
>  static int mt76s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
>  {
> -	int qid, err, nframes = 0, len = 0, pse_sz = 0, ple_sz = 0;
> +	int err, nframes = 0, len = 0, pse_sz = 0, ple_sz = 0;
>  	bool mcu = q == dev->q_mcu[MT_MCUQ_WM];
>  	struct mt76_sdio *sdio = &dev->sdio;
>  	u8 pad;
>  
> -	qid = mcu ? ARRAY_SIZE(sdio->xmit_buf) - 1 : q->qid;
>  	while (q->first != q->head) {
>  		struct mt76_queue_entry *e = &q->entry[q->first];
>  		struct sk_buff *iter;
> @@ -262,20 +261,18 @@ static int mt76s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
>  					&ple_sz))
>  			break;
>  
> -		memcpy(sdio->xmit_buf[qid] + len, e->skb->data,
> -		       skb_headlen(e->skb));
> +		memcpy(sdio->xmit_buf + len, e->skb->data, skb_headlen(e->skb));
>  		len += skb_headlen(e->skb);
>  		nframes++;
>  
>  		skb_walk_frags(e->skb, iter) {
> -			memcpy(sdio->xmit_buf[qid] + len, iter->data,
> -			       iter->len);
> +			memcpy(sdio->xmit_buf + len, iter->data, iter->len);
>  			len += iter->len;
>  			nframes++;
>  		}
>  
>  		if (unlikely(pad)) {
> -			memset(sdio->xmit_buf[qid] + len, 0, pad);
> +			memset(sdio->xmit_buf + len, 0, pad);
>  			len += pad;
>  		}
>  next:
> @@ -284,8 +281,8 @@ static int mt76s_tx_run_queue(struct mt76_dev *dev, struct mt76_queue *q)
>  	}
>  
>  	if (nframes) {
> -		memset(sdio->xmit_buf[qid] + len, 0, 4);
> -		err = __mt76s_xmit_queue(dev, sdio->xmit_buf[qid], len + 4);
> +		memset(sdio->xmit_buf + len, 0, 4);
> +		err = __mt76s_xmit_queue(dev, sdio->xmit_buf, len + 4);
>  		if (err)
>  			return err;
>  	}
> -- 
> 2.25.1
> 

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