From: Jason Wang <jasowang@redhat.com>
To: Zhu Lingshan <lingshan.zhu@intel.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 16:50:03 +0800 [thread overview]
Message-ID: <d286a8f9-ac5c-ba95-777e-df926ea45292@redhat.com> (raw)
In-Reply-To: <20210601062850.4547-3-lingshan.zhu@intel.com>
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
> +
> + 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 8:50 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 [this message]
2021-06-01 8:56 ` Zhu, Lingshan
2021-06-01 8:57 ` Jason Wang
2021-06-01 8:58 ` Zhu, Lingshan
2021-06-01 9:03 ` Zhu, Lingshan
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