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

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Date:   Wed, 24 Jul 2019 18:28:16 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "tanhuazhong@...wei.com" <tanhuazhong@...wei.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 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.

> 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);
>