netdev - Re: [PATCH net-next 01/10] net: hns3: refactor reset_prepare

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Date:   Mon, 29 Nov 2021 17:27:02 +0300
From:   Denis Kirjanov <dkirjanov@...e.de>
To:     Guangbin Huang <huangguangbin2@...wei.com>, davem@...emloft.net,
        kuba@...nel.org, wangjie125@...wei.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lipeng321@...wei.com, chenhao288@...ilicon.com
Subject: Re: [PATCH net-next 01/10] net: hns3: refactor reset_prepare_general
 retry statement



11/29/21 5:00 PM, Guangbin Huang пишет:
> From: Jiaran Zhang <zhangjiaran@...wei.com>
> 
> Currently, the hclge_reset_prepare_general function uses the goto
> statement to jump upwards, which increases code complexity and makes
> the program structure difficult to understand. In addition, if
> reset_pending is set, retry_cnt cannot be increased. This may result
> in a failure to exit the retry or increase the number of retries.
> 
> Use the while statement instead to make the program easier to understand
> and solve the problem that the goto statement cannot be exited.
> 
> Signed-off-by: Jiaran Zhang <zhangjiaran@...wei.com>
> Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>
> ---
>   .../hisilicon/hns3/hns3pf/hclge_main.c        | 32 ++++++++-----------
>   .../hisilicon/hns3/hns3vf/hclgevf_main.c      | 32 ++++++++-----------
>   2 files changed, 28 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> index a0628d139149..5282f2632b3b 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
> @@ -11589,24 +11589,20 @@ static void hclge_reset_prepare_general(struct hnae3_ae_dev *ae_dev,
>   	int retry_cnt = 0;
>   	int ret;
>   
> -retry:
> -	down(&hdev->reset_sem);
> -	set_bit(HCLGE_STATE_RST_HANDLING, &hdev->state);
> -	hdev->reset_type = rst_type;
> -	ret = hclge_reset_prepare(hdev);
> -	if (ret || hdev->reset_pending) {
> -		dev_err(&hdev->pdev->dev, "fail to prepare to reset, ret=%d\n",
> -			ret);
> -		if (hdev->reset_pending ||
> -		    retry_cnt++ < HCLGE_RESET_RETRY_CNT) {
> -			dev_err(&hdev->pdev->dev,
> -				"reset_pending:0x%lx, retry_cnt:%d\n",
> -				hdev->reset_pending, retry_cnt);
> -			clear_bit(HCLGE_STATE_RST_HANDLING, &hdev->state);
> -			up(&hdev->reset_sem);
> -			msleep(HCLGE_RESET_RETRY_WAIT_MS);
> -			goto retry;
> -		}
> +	while (retry_cnt++ < HCLGE_RESET_RETRY_CNT) {
> +		down(&hdev->reset_sem);
> +		set_bit(HCLGE_STATE_RST_HANDLING, &hdev->state);
> +		hdev->reset_type = rst_type;
> +		ret = hclge_reset_prepare(hdev);
> +		if (!ret && !hdev->reset_pending)
> +			break;
up(&hdev->reset_sem); ?
> +
> +		dev_err(&hdev->pdev->dev,
> +			"failed to prepare to reset, ret=%d, reset_pending:0x%lx, retry_cnt:%d\n",
> +			ret, hdev->reset_pending, retry_cnt);
> +		clear_bit(HCLGE_STATE_RST_HANDLING, &hdev->state);
> +		up(&hdev->reset_sem);
> +		msleep(HCLGE_RESET_RETRY_WAIT_MS);
>   	}
>   
>   	/* disable misc vector before reset done */
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
> index 3f29062eaf2e..0568cc31d391 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
> @@ -2166,24 +2166,20 @@ static void hclgevf_reset_prepare_general(struct hnae3_ae_dev *ae_dev,
>   	int retry_cnt = 0;
>   	int ret;
>   
> -retry:
> -	down(&hdev->reset_sem);
> -	set_bit(HCLGEVF_STATE_RST_HANDLING, &hdev->state);
> -	hdev->reset_type = rst_type;
> -	ret = hclgevf_reset_prepare(hdev);
> -	if (ret) {
> -		dev_err(&hdev->pdev->dev, "fail to prepare to reset, ret=%d\n",
> -			ret);
> -		if (hdev->reset_pending ||
> -		    retry_cnt++ < HCLGEVF_RESET_RETRY_CNT) {
> -			dev_err(&hdev->pdev->dev,
> -				"reset_pending:0x%lx, retry_cnt:%d\n",
> -				hdev->reset_pending, retry_cnt);
> -			clear_bit(HCLGEVF_STATE_RST_HANDLING, &hdev->state);
> -			up(&hdev->reset_sem);
> -			msleep(HCLGEVF_RESET_RETRY_WAIT_MS);
> -			goto retry;
> -		}
> +	while (retry_cnt++ < HCLGEVF_RESET_RETRY_CNT) {
> +		down(&hdev->reset_sem);
> +		set_bit(HCLGEVF_STATE_RST_HANDLING, &hdev->state);
> +		hdev->reset_type = rst_type;
> +		ret = hclgevf_reset_prepare(hdev);
> +		if (!ret && !hdev->reset_pending)
> +			break;
same here
> +
> +		dev_err(&hdev->pdev->dev,
> +			"failed to prepare to reset, ret=%d, reset_pending:0x%lx, retry_cnt:%d\n",
> +			ret, hdev->reset_pending, retry_cnt);
> +		clear_bit(HCLGEVF_STATE_RST_HANDLING, &hdev->state);
> +		up(&hdev->reset_sem);
> +		msleep(HCLGEVF_RESET_RETRY_WAIT_MS);
>   	}
>   
>   	/* disable misc vector before reset done */
>