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vDPA/ifcvf: implement doorbell mapping for ifcvf

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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>
Link: https://lore.kernel.org/r/20210602084550.289599-3-lingshan.zhu@intel.com
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhu Lingshan 2021-06-02 16:45:50 +08:00 committed by Michael S. Tsirkin
parent 04c6ad8f22
commit 5f1b73a275
1 changed files with 16 additions and 0 deletions
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16
drivers/vdpa/ifcvf/ifcvf_main.c
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@ -413,6 +413,21 @@ 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_hw *vf = vdpa_to_vf(vdpa_dev);
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;
return area;
}
/*
* IFCVF currently does't have on-chip IOMMU, so not
* implemented set_map()/dma_map()/dma_unmap()
@ -440,6 +455,7 @@ 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)