diff mbox series

[v11,11/40] virtio_ring: split: extract the logic of vring init

Message ID 20220629065656.54420-12-xuanzhuo@linux.alibaba.com (mailing list archive)
State Not Applicable
Delegated to: Netdev Maintainers
Headers show
Series virtio pci support VIRTIO_F_RING_RESET | expand

Checks

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

Commit Message

Xuan Zhuo June 29, 2022, 6:56 a.m. UTC
Separate the logic of initializing vring, and subsequent patches will
call it separately.

This function completes the variable initialization of split vring. It
together with the logic of atatch constitutes the initialization of
vring.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

Comments

Jason Wang July 1, 2022, 9 a.m. UTC | #1
在 2022/6/29 14:56, Xuan Zhuo 写道:
> Separate the logic of initializing vring, and subsequent patches will
> call it separately.
>
> This function completes the variable initialization of split vring. It
> together with the logic of atatch constitutes the initialization of
> vring.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>


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


> ---
>   drivers/virtio/virtio_ring.c | 30 +++++++++++++++++++-----------
>   1 file changed, 19 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 9025bd373d3b..35540daaa1e7 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -940,6 +940,24 @@ static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
>   	return NULL;
>   }
>   
> +static void virtqueue_vring_init_split(struct vring_virtqueue *vq)
> +{
> +	struct virtio_device *vdev;
> +
> +	vdev = vq->vq.vdev;
> +
> +	vq->split.avail_flags_shadow = 0;
> +	vq->split.avail_idx_shadow = 0;
> +
> +	/* No callback?  Tell other side not to bother us. */
> +	if (!vq->vq.callback) {
> +		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
> +		if (!vq->event)
> +			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
> +					vq->split.avail_flags_shadow);
> +	}
> +}
> +
>   static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
>   					 struct vring_virtqueue_split *vring)
>   {
> @@ -2299,17 +2317,6 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
>   	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
>   		!context;
>   
> -	vq->split.avail_flags_shadow = 0;
> -	vq->split.avail_idx_shadow = 0;
> -
> -	/* No callback?  Tell other side not to bother us. */
> -	if (!callback) {
> -		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
> -		if (!vq->event)
> -			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
> -					vq->split.avail_flags_shadow);
> -	}
> -
>   	vring.vring = _vring;
>   
>   	err = vring_alloc_state_extra_split(&vring);
> @@ -2320,6 +2327,7 @@ struct virtqueue *__vring_new_virtqueue(unsigned int index,
>   
>   	virtqueue_init(vq, vring.vring.num);
>   	virtqueue_vring_attach_split(vq, &vring);
> +	virtqueue_vring_init_split(vq);
>   
>   	spin_lock(&vdev->vqs_list_lock);
>   	list_add_tail(&vq->vq.list, &vdev->vqs);
diff mbox series

Patch

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 9025bd373d3b..35540daaa1e7 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -940,6 +940,24 @@  static void *virtqueue_detach_unused_buf_split(struct virtqueue *_vq)
 	return NULL;
 }
 
+static void virtqueue_vring_init_split(struct vring_virtqueue *vq)
+{
+	struct virtio_device *vdev;
+
+	vdev = vq->vq.vdev;
+
+	vq->split.avail_flags_shadow = 0;
+	vq->split.avail_idx_shadow = 0;
+
+	/* No callback?  Tell other side not to bother us. */
+	if (!vq->vq.callback) {
+		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
+		if (!vq->event)
+			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
+					vq->split.avail_flags_shadow);
+	}
+}
+
 static void virtqueue_vring_attach_split(struct vring_virtqueue *vq,
 					 struct vring_virtqueue_split *vring)
 {
@@ -2299,17 +2317,6 @@  struct virtqueue *__vring_new_virtqueue(unsigned int index,
 	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
 		!context;
 
-	vq->split.avail_flags_shadow = 0;
-	vq->split.avail_idx_shadow = 0;
-
-	/* No callback?  Tell other side not to bother us. */
-	if (!callback) {
-		vq->split.avail_flags_shadow |= VRING_AVAIL_F_NO_INTERRUPT;
-		if (!vq->event)
-			vq->split.vring.avail->flags = cpu_to_virtio16(vdev,
-					vq->split.avail_flags_shadow);
-	}
-
 	vring.vring = _vring;
 
 	err = vring_alloc_state_extra_split(&vring);
@@ -2320,6 +2327,7 @@  struct virtqueue *__vring_new_virtqueue(unsigned int index,
 
 	virtqueue_init(vq, vring.vring.num);
 	virtqueue_vring_attach_split(vq, &vring);
+	virtqueue_vring_init_split(vq);
 
 	spin_lock(&vdev->vqs_list_lock);
 	list_add_tail(&vq->vq.list, &vdev->vqs);