diff mbox series

[v13,20/42] virtio_ring: packed: extract the logic of vring init

Message ID 20220726072225.19884-21-xuanzhuo@linux.alibaba.com (mailing list archive)
State Superseded
Headers show
Series virtio pci support VIRTIO_F_RING_RESET | expand

Commit Message

Xuan Zhuo July 26, 2022, 7:22 a.m. UTC
Separate the logic of initializing vring, and subsequent patches will
call it separately.

This function completes the variable initialization of packed 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 | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

Comments

Jason Wang July 27, 2022, 4:33 a.m. UTC | #1
在 2022/7/26 15:22, Xuan Zhuo 写道:
> Separate the logic of initializing vring, and subsequent patches will
> call it separately.
>
> This function completes the variable initialization of packed 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 | 28 +++++++++++++++++-----------
>   1 file changed, 17 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 32590d763c3b..fc4e3db9f93b 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -1935,6 +1935,22 @@ static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring_p
>   	return -ENOMEM;
>   }
>   
> +static void virtqueue_vring_init_packed(struct vring_virtqueue_packed *vring_packed,
> +					bool callback)
> +{
> +	vring_packed->next_avail_idx = 0;
> +	vring_packed->avail_wrap_counter = 1;
> +	vring_packed->event_flags_shadow = 0;
> +	vring_packed->avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
> +
> +	/* No callback?  Tell other side not to bother us. */
> +	if (!callback) {
> +		vring_packed->event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;
> +		vring_packed->vring.driver->flags =
> +			cpu_to_le16(vring_packed->event_flags_shadow);
> +	}
> +}
> +
>   static struct virtqueue *vring_create_virtqueue_packed(
>   	unsigned int index,
>   	unsigned int num,
> @@ -1984,11 +2000,6 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   
>   	vq->packed.vring = vring_packed.vring;
>   
> -	vq->packed.next_avail_idx = 0;
> -	vq->packed.avail_wrap_counter = 1;
> -	vq->packed.event_flags_shadow = 0;
> -	vq->packed.avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
> -
>   	err = vring_alloc_state_extra_packed(&vring_packed);
>   	if (err)
>   		goto err_state_extra;
> @@ -1996,12 +2007,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   	vq->packed.desc_state = vring_packed.desc_state;
>   	vq->packed.desc_extra = vring_packed.desc_extra;
>   
> -	/* No callback?  Tell other side not to bother us. */
> -	if (!callback) {
> -		vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;
> -		vq->packed.vring.driver->flags =
> -			cpu_to_le16(vq->packed.event_flags_shadow);
> -	}
> +	virtqueue_vring_init_packed(&vring_packed, !!callback);
>   
>   	virtqueue_init(vq, num);
>
diff mbox series

Patch

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 32590d763c3b..fc4e3db9f93b 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1935,6 +1935,22 @@  static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring_p
 	return -ENOMEM;
 }
 
+static void virtqueue_vring_init_packed(struct vring_virtqueue_packed *vring_packed,
+					bool callback)
+{
+	vring_packed->next_avail_idx = 0;
+	vring_packed->avail_wrap_counter = 1;
+	vring_packed->event_flags_shadow = 0;
+	vring_packed->avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
+
+	/* No callback?  Tell other side not to bother us. */
+	if (!callback) {
+		vring_packed->event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;
+		vring_packed->vring.driver->flags =
+			cpu_to_le16(vring_packed->event_flags_shadow);
+	}
+}
+
 static struct virtqueue *vring_create_virtqueue_packed(
 	unsigned int index,
 	unsigned int num,
@@ -1984,11 +2000,6 @@  static struct virtqueue *vring_create_virtqueue_packed(
 
 	vq->packed.vring = vring_packed.vring;
 
-	vq->packed.next_avail_idx = 0;
-	vq->packed.avail_wrap_counter = 1;
-	vq->packed.event_flags_shadow = 0;
-	vq->packed.avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
-
 	err = vring_alloc_state_extra_packed(&vring_packed);
 	if (err)
 		goto err_state_extra;
@@ -1996,12 +2007,7 @@  static struct virtqueue *vring_create_virtqueue_packed(
 	vq->packed.desc_state = vring_packed.desc_state;
 	vq->packed.desc_extra = vring_packed.desc_extra;
 
-	/* No callback?  Tell other side not to bother us. */
-	if (!callback) {
-		vq->packed.event_flags_shadow = VRING_PACKED_EVENT_FLAG_DISABLE;
-		vq->packed.vring.driver->flags =
-			cpu_to_le16(vq->packed.event_flags_shadow);
-	}
+	virtqueue_vring_init_packed(&vring_packed, !!callback);
 
 	virtqueue_init(vq, num);