netdev - Re: [PATCH 3/3] vDPA/ifcvf: set_status() should get a adapter from the mgmt dev

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Date:   Mon, 5 Jul 2021 17:46:45 +0800
From:   "Zhu, Lingshan" <lingshan.zhu@...el.com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH 3/3] vDPA/ifcvf: set_status() should get a adapter from
 the mgmt dev



On 7/5/2021 1:09 PM, Jason Wang wrote:
>
> 在 2021/6/30 下午4:21, Zhu Lingshan 写道:
>> ifcvf_vdpa_set_status() should get a adapter from the
>> management device
>>
>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>> ---
>>   drivers/vdpa/ifcvf/ifcvf_main.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c 
>> b/drivers/vdpa/ifcvf/ifcvf_main.c
>> index 7c2f64ca2163..28c71eef1d2b 100644
>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
>> @@ -212,13 +212,15 @@ static u8 ifcvf_vdpa_get_status(struct 
>> vdpa_device *vdpa_dev)
>>     static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, 
>> u8 status)
>>   {
>> +    struct ifcvf_vdpa_mgmt_dev *ifcvf_mgmt_dev;
>>       struct ifcvf_adapter *adapter;
>>       struct ifcvf_hw *vf;
>>       u8 status_old;
>>       int ret;
>>         vf  = vdpa_to_vf(vdpa_dev);
>> -    adapter = dev_get_drvdata(vdpa_dev->dev.parent);
>
>
> If this is a fix for patch 2, you need to squash this into that one.
sure will squash it to patch 2
>
> Any reason that vdpa_to_adapter() can't work?
will use it in V2.
>
> And I see:
>
> +struct ifcvf_vdpa_mgmt_dev {
> +    struct vdpa_mgmt_dev mdev;
> +    struct ifcvf_adapter *adapter;
> +    struct pci_dev *pdev;
> +};
>
> What's the reason for having a adapter pointer here?
because in ifcvf_remove(), we need to get the management device from 
pdev struct, so need to set the management device pointor
to the pdev drvdata, then need this *adapter pointor to address the adapter.

Thanks
>
>
> Thanks
>
>
>> +    ifcvf_mgmt_dev = dev_get_drvdata(vdpa_dev->dev.parent);
>> +    adapter = ifcvf_mgmt_dev->adapter;
>>       status_old = ifcvf_get_status(vf);
>>         if (status_old == status)
>