From: Zhu Lingshan <lingshan.zhu@intel.com>
To: jasowang@redhat.com, mst@redhat.com
Cc: virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org,
Zhu Lingshan <lingshan.zhu@intel.com>
Subject: [PATCH 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf
Date: Wed, 28 Apr 2021 16:21:33 +0800 [thread overview]
Message-ID: <20210428082133.6766-3-lingshan.zhu@intel.com> (raw)
In-Reply-To: <20210428082133.6766-1-lingshan.zhu@intel.com>
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 | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index e48e6b74fe2e..afcb71bc0f51 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -413,6 +413,23 @@ 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;
+
+ if (vf->notify_pa % PAGE_SIZE) {
+ area.addr = 0;
+ area.size = 0;
+ } else {
+ area.addr = vf->notify_pa;
+ area.size = PAGE_SIZE;
+ }
+
+ return area;
+}
+
/*
* IFCVF currently does't have on-chip IOMMU, so not
* implemented set_map()/dma_map()/dma_unmap()
@@ -440,6 +457,7 @@ 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)
--
2.27.0
next prev parent reply other threads:[~2021-04-28 8:27 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-28 8:21 [PATCH 0/2] vDPA/ifcvf: implement doorbell mapping feature Zhu Lingshan
2021-04-28 8:21 ` [PATCH 1/2] vDPA/ifcvf: record virtio notify base Zhu Lingshan
2021-04-28 8:39 ` Jason Wang
2021-04-28 10:00 ` Zhu, Lingshan
2021-04-28 10:09 ` Jason Wang
2021-04-28 10:18 ` Zhu, Lingshan
2021-04-28 11:48 ` kernel test robot
2021-04-28 8:21 ` Zhu Lingshan [this message]
2021-04-28 8:42 ` [PATCH 2/2] vDPA/ifcvf: implement doorbell mapping for ifcvf Jason Wang
2021-04-28 8:59 ` Zhu, Lingshan
2021-04-28 9:21 ` Jason Wang
2021-04-28 9:56 ` Zhu, Lingshan
2021-04-28 10:03 ` Jason Wang
2021-04-28 10:20 ` Zhu, Lingshan
2021-04-28 13:08 ` Jason Wang
2021-04-29 11:26 ` Zhu, Lingshan
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