Jason Wang
2021-Jun-02 09:06 UTC
[RESEND PATCH V4 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf
? 2021/6/2 ??4:45, Zhu Lingshan ??:> 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 at intel.com>Acked-by: Jason Wang <jasowang at redhat.com>> --- > drivers/vdpa/ifcvf/ifcvf_main.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c > index ab0ab5cf0f6e..46a992eab3e5 100644 > --- a/drivers/vdpa/ifcvf/ifcvf_main.c > +++ b/drivers/vdpa/ifcvf/ifcvf_main.c > @@ -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)