netdev - Re: [PATCH V3 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf

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Date:   Tue, 1 Jun 2021 17:03:37 +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 V3 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf



On 6/1/2021 4:58 PM, Zhu, Lingshan wrote:
>
>
> On 6/1/2021 4:57 PM, Jason Wang wrote:
>>
>> 在 2021/6/1 下午4:56, Zhu, Lingshan 写道:
>>>
>>>
>>> On 6/1/2021 4:50 PM, Jason Wang wrote:
>>>>
>>>> 在 2021/6/1 下午2:28, Zhu Lingshan 写道:
>>>>> This commit implements doorbell mapping feature for ifcvf.
>>>>> This feature maps the notify page to userspace, to eliminate
>>>>> vmexit when kick a vq.
>>>>>
>>>>> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
>>>>> ---
>>>>>   drivers/vdpa/ifcvf/ifcvf_main.c | 21 +++++++++++++++++++++
>>>>>   1 file changed, 21 insertions(+)
>>>>>
>>>>> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c 
>>>>> b/drivers/vdpa/ifcvf/ifcvf_main.c
>>>>> index ab0ab5cf0f6e..d41db042612c 100644
>>>>> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
>>>>> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
>>>>> @@ -413,6 +413,26 @@ static int ifcvf_vdpa_get_vq_irq(struct 
>>>>> vdpa_device *vdpa_dev,
>>>>>       return vf->vring[qid].irq;
>>>>>   }
>>>>>   +static struct vdpa_notification_area 
>>>>> ifcvf_get_vq_notification(struct vdpa_device *vdpa_dev,
>>>>> +                                   u16 idx)
>>>>> +{
>>>>> +    struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
>>>>> +    struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
>>>>> +    struct pci_dev *pdev = adapter->pdev;
>>>>> +    struct vdpa_notification_area area;
>>>>> +
>>>>> +    area.addr = vf->vring[idx].notify_pa;
>>>>> +    if (!vf->notify_off_multiplier)
>>>>> +        area.size = PAGE_SIZE;
>>>>> +    else
>>>>> +        area.size = vf->notify_off_multiplier;
>>>>> +
>>>>> +    if (area.addr % PAGE_SIZE)
>>>>> +        IFCVF_DBG(pdev, "vq %u doorbell address is not PAGE_SIZE 
>>>>> aligned\n", idx);
>>>>
>>>>
>>>> I don't see the reason to keep this, or get_notification is not the 
>>>> proper place to do this kind of warning.
>>>>
>>>> Thanks
>>> some customers have ever complained have troubles to enable such 
>>> features with their IP,
>>> I think this can help them debug.
>>
>>
>> If you want to do this, the ifcvf_init_hw() is the proper place.
>>
>> Note that this function is called by userspace.
>>
>> Thanks
> OK, will move to there.
>
> Thanks!
oh, I see patch 1 is already has been acked, so I will remove this warning.

Thanks!
>>
>>
>>>
>>> Thanks
>>>>
>>>>
>>>>> +
>>>>> +    return area;
>>>>> +}
>>>>> +
>>>>>   /*
>>>>>    * IFCVF currently does't have on-chip IOMMU, so not
>>>>>    * implemented set_map()/dma_map()/dma_unmap()
>>>>> @@ -440,6 +460,7 @@ static const struct vdpa_config_ops 
>>>>> ifc_vdpa_ops = {
>>>>>       .get_config    = ifcvf_vdpa_get_config,
>>>>>       .set_config    = ifcvf_vdpa_set_config,
>>>>>       .set_config_cb  = ifcvf_vdpa_set_config_cb,
>>>>> +    .get_vq_notification = ifcvf_get_vq_notification,
>>>>>   };
>>>>>     static int ifcvf_probe(struct pci_dev *pdev, const struct 
>>>>> pci_device_id *id)
>>>>
>>>
>>
>