diff mbox series

[v9,08/32] virtio_ring: split: extract the logic of attach vring

Message ID 20220406034346.74409-9-xuanzhuo@linux.alibaba.com (mailing list archive)
State Not Applicable
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 
Separate the logic of attach vring, subsequent patches will call it
separately.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

Comments

Jason Wang April 12, 2022, 3:31 a.m. UTC | #1 
在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> Separate the logic of attach vring, subsequent patches will call it
> separately.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> ---
>   drivers/virtio/virtio_ring.c | 20 ++++++++++++++------
>   1 file changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 6de67439cb57..083f2992ba0d 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -916,6 +916,19 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
>   	return NULL;
>   }
>   
> +static void vring_virtqueue_attach_split(struct vring_virtqueue *vq,
> +					 struct vring vring,
> +					 struct vring_desc_state_split *desc_state,
> +					 struct vring_desc_extra *desc_extra)
> +{
> +	vq->split.vring = vring;
> +	vq->split.queue_dma_addr = 0;
> +	vq->split.queue_size_in_bytes = 0;


Any reason to add the above two assignment in attach? It seems belong to 
free or reset.

Thanks


> +
> +	vq->split.desc_state = desc_state;
> +	vq->split.desc_extra = desc_extra;
> +}
> +
>   static int vring_alloc_state_extra_split(u32 num,
>   					 struct vring_desc_state_split **desc_state,
>   					 struct vring_desc_extra **desc_extra)
> @@ -2262,10 +2275,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
>   	if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
>   		vq->weak_barriers = false;
>   
> -	vq->split.queue_dma_addr = 0;
> -	vq->split.queue_size_in_bytes = 0;
> -
> -	vq->split.vring = vring;
>   	vq->split.avail_flags_shadow = 0;
>   	vq->split.avail_idx_shadow = 0;
>   
> @@ -2283,8 +2292,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
>   		return NULL;
>   	}
>   
> -	vq->split.desc_state = state;
> -	vq->split.desc_extra = extra;
> +	vring_virtqueue_attach_split(vq, vring, state, extra);
>   
>   	/* Put everything in free lists. */
>   	vq->free_head = 0;
Xuan Zhuo April 13, 2022, 6:44 a.m. UTC | #2 
On Tue, 12 Apr 2022 11:31:08 +0800, Jason Wang <jasowang@redhat.com> wrote:
>
> 在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> > Separate the logic of attach vring, subsequent patches will call it
> > separately.
> >
> > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
> > ---
> >   drivers/virtio/virtio_ring.c | 20 ++++++++++++++------
> >   1 file changed, 14 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> > index 6de67439cb57..083f2992ba0d 100644
> > --- a/drivers/virtio/virtio_ring.c
> > +++ b/drivers/virtio/virtio_ring.c
> > @@ -916,6 +916,19 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
> >   	return NULL;
> >   }
> >
> > +static void vring_virtqueue_attach_split(struct vring_virtqueue *vq,
> > +					 struct vring vring,
> > +					 struct vring_desc_state_split *desc_state,
> > +					 struct vring_desc_extra *desc_extra)
> > +{
> > +	vq->split.vring = vring;
> > +	vq->split.queue_dma_addr = 0;
> > +	vq->split.queue_size_in_bytes = 0;
>
>
> Any reason to add the above two assignment in attach? It seems belong to
> free or reset.

As discussed in patch 11, since there is no dma_addr in __vring_new_virtqueue(),
the corresponding vq->split.queue_dma_addr cannot be set, so the purpose here
is just to initialize it.

In the next version, struct vring_virtqueue_split will be passed to
vring_virtqueue_attach_split() to make the logic here look more reasonable.

Thanks.


>
> Thanks
>
>
> > +
> > +	vq->split.desc_state = desc_state;
> > +	vq->split.desc_extra = desc_extra;
> > +}
> > +
> >   static int vring_alloc_state_extra_split(u32 num,
> >   					 struct vring_desc_state_split **desc_state,
> >   					 struct vring_desc_extra **desc_extra)
> > @@ -2262,10 +2275,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
> >   	if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
> >   		vq->weak_barriers = false;
> >
> > -	vq->split.queue_dma_addr = 0;
> > -	vq->split.queue_size_in_bytes = 0;
> > -
> > -	vq->split.vring = vring;
> >   	vq->split.avail_flags_shadow = 0;
> >   	vq->split.avail_idx_shadow = 0;
> >
> > @@ -2283,8 +2292,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
> >   		return NULL;
> >   	}
> >
> > -	vq->split.desc_state = state;
> > -	vq->split.desc_extra = extra;
> > +	vring_virtqueue_attach_split(vq, vring, state, extra);
> >
> >   	/* Put everything in free lists. */
> >   	vq->free_head = 0;
>
diff mbox series

Patch

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 6de67439cb57..083f2992ba0d 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -916,6 +916,19 @@  static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
 	return NULL;
 }
 
+static void vring_virtqueue_attach_split(struct vring_virtqueue *vq,
+					 struct vring vring,
+					 struct vring_desc_state_split *desc_state,
+					 struct vring_desc_extra *desc_extra)
+{
+	vq->split.vring = vring;
+	vq->split.queue_dma_addr = 0;
+	vq->split.queue_size_in_bytes = 0;
+
+	vq->split.desc_state = desc_state;
+	vq->split.desc_extra = desc_extra;
+}
+
 static int vring_alloc_state_extra_split(u32 num,
 					 struct vring_desc_state_split **desc_state,
 					 struct vring_desc_extra **desc_extra)
@@ -2262,10 +2275,6 @@  struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	if (virtio_has_feature(vdev, VIRTIO_F_ORDER_PLATFORM))
 		vq->weak_barriers = false;
 
-	vq->split.queue_dma_addr = 0;
-	vq->split.queue_size_in_bytes = 0;
-
-	vq->split.vring = vring;
 	vq->split.avail_flags_shadow = 0;
 	vq->split.avail_idx_shadow = 0;
 
@@ -2283,8 +2292,7 @@  struct virtqueue *__vring_new_virtqueue(unsigned int index,
 		return NULL;
 	}
 
-	vq->split.desc_state = state;
-	vq->split.desc_extra = extra;
+	vring_virtqueue_attach_split(vq, vring, state, extra);
 
 	/* Put everything in free lists. */
 	vq->free_head = 0;