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

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Date:   Tue, 30 Nov 2021 10:15:03 +0800
From:   "huangguangbin (A)" <huangguangbin2@...wei.com>
To:     Denis Kirjanov <dkirjanov@...e.de>, <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



On 2021/11/29 22:27, Denis Kirjanov wrote:
> 
> 
> 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); ?

This is reset preparation in PCIe FLR reset process, up(&hdev->reset_sem) will be called in hclge_reset_done().

>> +
>> +        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

Same as above.

>> +
>> +        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 */
>>
> .