From: "Zhu, Lingshan" <lingshan.zhu@intel.com>
To: Jason Wang <jasowang@redhat.com>, mst@redhat.com
Cc: virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH V3 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf
Date: Tue, 1 Jun 2021 16:58:52 +0800 [thread overview]
Message-ID: <68a31c70-cc9f-346a-14a0-cbc05905c287@intel.com> (raw)
In-Reply-To: <5c8ebd49-59fe-31c3-71bf-44bd0bf64e2a@redhat.com>
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@intel.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!
>
>
>>
>> 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)
>>>
>>
>
next prev parent reply other threads:[~2021-06-01 8:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 6:28 [PATCH V3 0/2] vDPA/ifcvf: implement doorbell mapping feature Zhu Lingshan
2021-06-01 6:28 ` [PATCH V3 1/2] vDPA/ifcvf: record virtio notify base Zhu Lingshan
2021-06-01 8:53 ` Jason Wang
2021-06-01 6:28 ` [PATCH V3 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf Zhu Lingshan
2021-06-01 8:50 ` Jason Wang
2021-06-01 8:56 ` Zhu, Lingshan
2021-06-01 8:57 ` Jason Wang
2021-06-01 8:58 ` Zhu, Lingshan [this message]
2021-06-01 9:03 ` Zhu, Lingshan
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