diff mbox series

[v9,22/32] virtio_pci: queue_reset: extract the logic of active vq for modern pci

Message ID 20220406034346.74409-23-xuanzhuo@linux.alibaba.com (mailing list archive)
State Not Applicable
Delegated to: Netdev Maintainers
Headers show
Series virtio pci support VIRTIO_F_RING_RESET (refactor vring) | expand

Checks

Context Check Description
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Xuan Zhuo April 6, 2022, 3:43 a.m. UTC
Introduce vp_active_vq() to configure vring to backend after vq attach
vring. And configure vq vector if necessary.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_pci_modern.c | 46 ++++++++++++++++++------------
 1 file changed, 28 insertions(+), 18 deletions(-)

Comments

Jason Wang April 12, 2022, 6:58 a.m. UTC | #1
在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> Introduce vp_active_vq() to configure vring to backend after vq attach
> vring. And configure vq vector if necessary.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> ---
>   drivers/virtio/virtio_pci_modern.c | 46 ++++++++++++++++++------------
>   1 file changed, 28 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> index 86d301f272b8..49a4493732cf 100644
> --- a/drivers/virtio/virtio_pci_modern.c
> +++ b/drivers/virtio/virtio_pci_modern.c
> @@ -176,6 +176,29 @@ static void vp_reset(struct virtio_device *vdev)
>   	vp_disable_cbs(vdev);
>   }
>   
> +static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
> +{
> +	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> +	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> +	unsigned long index;
> +
> +	index = vq->index;
> +
> +	/* activate the queue */
> +	vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
> +	vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
> +				virtqueue_get_avail_addr(vq),
> +				virtqueue_get_used_addr(vq));
> +
> +	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
> +		msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
> +		if (msix_vec == VIRTIO_MSI_NO_VECTOR)
> +			return -EBUSY;
> +	}
> +
> +	return 0;
> +}
> +
>   static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
>   {
>   	return vp_modern_config_vector(&vp_dev->mdev, vector);
> @@ -220,32 +243,19 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
>   
>   	vq->num_max = num;
>   
> -	/* activate the queue */
> -	vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
> -	vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
> -				virtqueue_get_avail_addr(vq),
> -				virtqueue_get_used_addr(vq));
> +	err = vp_active_vq(vq, msix_vec);
> +	if (err)
> +		goto err;
>   
>   	vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
>   	if (!vq->priv) {
>   		err = -ENOMEM;
> -		goto err_map_notify;
> -	}
> -
> -	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
> -		msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
> -		if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
> -			err = -EBUSY;
> -			goto err_assign_vector;
> -		}
> +		goto err;
>   	}
>   
>   	return vq;
>   
> -err_assign_vector:
> -	if (!mdev->notify_base)
> -		pci_iounmap(mdev->pci_dev, (void __iomem __force *)vq->priv);


We need keep this or anything I missed?

Thanks


> -err_map_notify:
> +err:
>   	vring_del_virtqueue(vq);
>   	return ERR_PTR(err);
>   }
Xuan Zhuo April 14, 2022, 6:22 a.m. UTC | #2
On Tue, 12 Apr 2022 14:58:19 +0800, Jason Wang <jasowang@redhat.com> wrote:
>
> 在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> > Introduce vp_active_vq() to configure vring to backend after vq attach
> > vring. And configure vq vector if necessary.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> > ---
> >   drivers/virtio/virtio_pci_modern.c | 46 ++++++++++++++++++------------
> >   1 file changed, 28 insertions(+), 18 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> > index 86d301f272b8..49a4493732cf 100644
> > --- a/drivers/virtio/virtio_pci_modern.c
> > +++ b/drivers/virtio/virtio_pci_modern.c
> > @@ -176,6 +176,29 @@ static void vp_reset(struct virtio_device *vdev)
> >   	vp_disable_cbs(vdev);
> >   }
> >
> > +static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
> > +{
> > +	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > +	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > +	unsigned long index;
> > +
> > +	index = vq->index;
> > +
> > +	/* activate the queue */
> > +	vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
> > +	vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
> > +				virtqueue_get_avail_addr(vq),
> > +				virtqueue_get_used_addr(vq));
> > +
> > +	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
> > +		msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
> > +		if (msix_vec == VIRTIO_MSI_NO_VECTOR)
> > +			return -EBUSY;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >   static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
> >   {
> >   	return vp_modern_config_vector(&vp_dev->mdev, vector);
> > @@ -220,32 +243,19 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> >
> >   	vq->num_max = num;
> >
> > -	/* activate the queue */
> > -	vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
> > -	vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
> > -				virtqueue_get_avail_addr(vq),
> > -				virtqueue_get_used_addr(vq));
> > +	err = vp_active_vq(vq, msix_vec);
> > +	if (err)
> > +		goto err;
> >
> >   	vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
> >   	if (!vq->priv) {
> >   		err = -ENOMEM;
> > -		goto err_map_notify;
> > -	}
> > -
> > -	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
> > -		msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
> > -		if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
> > -			err = -EBUSY;
> > -			goto err_assign_vector;
> > -		}
> > +		goto err;
> >   	}
> >
> >   	return vq;
> >
> > -err_assign_vector:
> > -	if (!mdev->notify_base)
> > -		pci_iounmap(mdev->pci_dev, (void __iomem __force *)vq->priv);
>
>
> We need keep this or anything I missed?

I think so, after modification, vp_modern_map_vq_notify is the last step before
returning vq. If it fails, then vq->priv is equal to NULL, so there is no need
to execute pci_iounmap.

Did I miss something?

Thanks.

>
> Thanks
>
>
> > -err_map_notify:
> > +err:
> >   	vring_del_virtqueue(vq);
> >   	return ERR_PTR(err);
> >   }
>
Jason Wang April 14, 2022, 9:37 a.m. UTC | #3
On Thu, Apr 14, 2022 at 2:25 PM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote:
>
> On Tue, 12 Apr 2022 14:58:19 +0800, Jason Wang <jasowang@redhat.com> wrote:
> >
> > 在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> > > Introduce vp_active_vq() to configure vring to backend after vq attach
> > > vring. And configure vq vector if necessary.
> > >
> > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> > > ---
> > >   drivers/virtio/virtio_pci_modern.c | 46 ++++++++++++++++++------------
> > >   1 file changed, 28 insertions(+), 18 deletions(-)
> > >
> > > diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> > > index 86d301f272b8..49a4493732cf 100644
> > > --- a/drivers/virtio/virtio_pci_modern.c
> > > +++ b/drivers/virtio/virtio_pci_modern.c
> > > @@ -176,6 +176,29 @@ static void vp_reset(struct virtio_device *vdev)
> > >     vp_disable_cbs(vdev);
> > >   }
> > >
> > > +static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
> > > +{
> > > +   struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > > +   struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > > +   unsigned long index;
> > > +
> > > +   index = vq->index;
> > > +
> > > +   /* activate the queue */
> > > +   vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
> > > +   vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
> > > +                           virtqueue_get_avail_addr(vq),
> > > +                           virtqueue_get_used_addr(vq));
> > > +
> > > +   if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
> > > +           msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
> > > +           if (msix_vec == VIRTIO_MSI_NO_VECTOR)
> > > +                   return -EBUSY;
> > > +   }
> > > +
> > > +   return 0;
> > > +}
> > > +
> > >   static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
> > >   {
> > >     return vp_modern_config_vector(&vp_dev->mdev, vector);
> > > @@ -220,32 +243,19 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> > >
> > >     vq->num_max = num;
> > >
> > > -   /* activate the queue */
> > > -   vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
> > > -   vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
> > > -                           virtqueue_get_avail_addr(vq),
> > > -                           virtqueue_get_used_addr(vq));
> > > +   err = vp_active_vq(vq, msix_vec);
> > > +   if (err)
> > > +           goto err;
> > >
> > >     vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
> > >     if (!vq->priv) {
> > >             err = -ENOMEM;
> > > -           goto err_map_notify;
> > > -   }
> > > -
> > > -   if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
> > > -           msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
> > > -           if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
> > > -                   err = -EBUSY;
> > > -                   goto err_assign_vector;
> > > -           }
> > > +           goto err;
> > >     }
> > >
> > >     return vq;
> > >
> > > -err_assign_vector:
> > > -   if (!mdev->notify_base)
> > > -           pci_iounmap(mdev->pci_dev, (void __iomem __force *)vq->priv);
> >
> >
> > We need keep this or anything I missed?
>
> I think so, after modification, vp_modern_map_vq_notify is the last step before
> returning vq. If it fails, then vq->priv is equal to NULL, so there is no need
> to execute pci_iounmap.
>
> Did I miss something?

Nope I miss that the vector is configured before the mapping.

So

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks

>
> Thanks.
>
> >
> > Thanks
> >
> >
> > > -err_map_notify:
> > > +err:
> > >     vring_del_virtqueue(vq);
> > >     return ERR_PTR(err);
> > >   }
> >
>
diff mbox series

Patch

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 86d301f272b8..49a4493732cf 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -176,6 +176,29 @@  static void vp_reset(struct virtio_device *vdev)
 	vp_disable_cbs(vdev);
 }
 
+static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+	unsigned long index;
+
+	index = vq->index;
+
+	/* activate the queue */
+	vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
+	vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
+				virtqueue_get_avail_addr(vq),
+				virtqueue_get_used_addr(vq));
+
+	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
+		msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
+		if (msix_vec == VIRTIO_MSI_NO_VECTOR)
+			return -EBUSY;
+	}
+
+	return 0;
+}
+
 static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
 {
 	return vp_modern_config_vector(&vp_dev->mdev, vector);
@@ -220,32 +243,19 @@  static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
 
 	vq->num_max = num;
 
-	/* activate the queue */
-	vp_modern_set_queue_size(mdev, index, virtqueue_get_vring_size(vq));
-	vp_modern_queue_address(mdev, index, virtqueue_get_desc_addr(vq),
-				virtqueue_get_avail_addr(vq),
-				virtqueue_get_used_addr(vq));
+	err = vp_active_vq(vq, msix_vec);
+	if (err)
+		goto err;
 
 	vq->priv = (void __force *)vp_modern_map_vq_notify(mdev, index, NULL);
 	if (!vq->priv) {
 		err = -ENOMEM;
-		goto err_map_notify;
-	}
-
-	if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
-		msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
-		if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
-			err = -EBUSY;
-			goto err_assign_vector;
-		}
+		goto err;
 	}
 
 	return vq;
 
-err_assign_vector:
-	if (!mdev->notify_base)
-		pci_iounmap(mdev->pci_dev, (void __iomem __force *)vq->priv);
-err_map_notify:
+err:
 	vring_del_virtqueue(vq);
 	return ERR_PTR(err);
 }