netdev - Re: [PATCH net-next 04/11] net: hns3: fix mis-counting IRQ vector numbers issue

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Date:   Thu, 25 Jul 2019 10:04:46 +0800
From:   tanhuazhong <tanhuazhong@...wei.com>
To:     Saeed Mahameed <saeedm@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "lipeng321@...wei.com" <lipeng321@...wei.com>,
        "yisen.zhuang@...wei.com" <yisen.zhuang@...wei.com>,
        "salil.mehta@...wei.com" <salil.mehta@...wei.com>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "liuyonglong@...wei.com" <liuyonglong@...wei.com>
Subject: Re: [PATCH net-next 04/11] net: hns3: fix mis-counting IRQ vector
 numbers issue



On 2019/7/25 2:28, Saeed Mahameed wrote:
> On Wed, 2019-07-24 at 11:18 +0800, Huazhong Tan wrote:
>> From: Yonglong Liu <liuyonglong@...wei.com>
>>
>> The num_msi_left means the vector numbers of NIC, but if the
>> PF supported RoCE, it contains the vector numbers of NIC and
>> RoCE(Not expected).
>>
>> This may cause interrupts lost in some case, because of the
>> NIC module used the vector resources which belongs to RoCE.
>>
>> This patch corrects the value of num_msi_left to be equals to
>> the vector numbers of NIC, and adjust the default tqp numbers
>> according to the value of num_msi_left.
>>
>> Fixes: 46a3df9f9718 ("net: hns3: Add HNS3 Acceleration Engine &
>> Compatibility Layer Support")
>> Signed-off-by: Yonglong Liu <liuyonglong@...wei.com>
>> Signed-off-by: Peng Li <lipeng321@...wei.com>
>> Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
>> ---
>>   drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c   |  5 ++++-
>>   drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 12
>> ++++++++++--
>>   2 files changed, 14 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
>> b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
>> index 3c64d70..a59d13f 100644
>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
>> @@ -1470,13 +1470,16 @@ static int hclge_vport_setup(struct
>> hclge_vport *vport, u16 num_tqps)
>>   {
>>   	struct hnae3_handle *nic = &vport->nic;
>>   	struct hclge_dev *hdev = vport->back;
>> +	u16 alloc_tqps;
>>   	int ret;
>>   
>>   	nic->pdev = hdev->pdev;
>>   	nic->ae_algo = &ae_algo;
>>   	nic->numa_node_mask = hdev->numa_node_mask;
>>   
>> -	ret = hclge_knic_setup(vport, num_tqps,
>> +	alloc_tqps = min_t(u16, hdev->roce_base_msix_offset - 1,
> 
> 
> Why do you need the extra alloc_tqps ? just overwrite num_tqps, the
> original value is not needed afterwards.
> 

Yes, using num_tqps is better.
I will remove the extra alloc_tqps in V2.
Thanks.

>> num_tqps);
>> +
>> +	ret = hclge_knic_setup(vport, alloc_tqps,
>>   			       hdev->num_tx_desc, hdev->num_rx_desc);
>>   	if (ret)
>>   		dev_err(&hdev->pdev->dev, "knic setup failed %d\n",
>> ret);
>>