netdev - Re: [PATCH net-next 01/10] net: hns3: Support for dynamically assigning tx buffer to TC

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Date:   Thu, 21 Sep 2017 18:41:02 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     linyunsheng@...wei.com
Cc:     huangdaode@...ilicon.com, xuwei5@...ilicon.com,
        liguozhu@...ilicon.com, Yisen.Zhuang@...wei.com,
        gabriele.paoloni@...wei.com, john.garry@...wei.com,
        linuxarm@...wei.com, salil.mehta@...wei.com, lipeng321@...wei.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 01/10] net: hns3: Support for dynamically
 assigning tx buffer to TC

From: Yunsheng Lin <linyunsheng@...wei.com>
Date: Thu, 21 Sep 2017 19:21:44 +0800

> @@ -1324,23 +1324,28 @@ static int hclge_alloc_vport(struct hclge_dev *hdev)
>  	return 0;
>  }
>  
> -static int  hclge_cmd_alloc_tx_buff(struct hclge_dev *hdev, u16 buf_size)
> +static int  hclge_cmd_alloc_tx_buff(struct hclge_dev *hdev)
>  {
>  /* TX buffer size is unit by 128 byte */
>  #define HCLGE_BUF_SIZE_UNIT_SHIFT	7
>  #define HCLGE_BUF_SIZE_UPDATE_EN_MSK	BIT(15)
>  	struct hclge_tx_buff_alloc *req;
> +	struct hclge_priv_buf *priv;
>  	struct hclge_desc desc;
> +	u32 buf_size;
>  	int ret;
>  	u8 i;
>  
>  	req = (struct hclge_tx_buff_alloc *)desc.data;
>  
>  	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_TX_BUFF_ALLOC, 0);
> -	for (i = 0; i < HCLGE_TC_NUM; i++)
> +	for (i = 0; i < HCLGE_TC_NUM; i++) {
> +		priv = &hdev->priv_buf[i];
> +		buf_size = priv->tx_buf_size;
>  		req->tx_pkt_buff[i] =
>  			cpu_to_le16((buf_size >> HCLGE_BUF_SIZE_UNIT_SHIFT) |
>  				     HCLGE_BUF_SIZE_UPDATE_EN_MSK);
> +	}
>  
>  	ret = hclge_cmd_send(&hdev->hw, &desc, 1);
>  	if (ret) {

Local variable 'buf_size' is assigned but never used in this function.
And with 'buf_size' removed, 'priv' also becomes unused.

If it gets used in a later patch, add it in that later patch.

You can also declare the variables locally in the basic block of
the for() loop.