diff mbox series

[v13,10/42] virtio_ring: split: extract the logic of alloc queue

Message ID 20220726072225.19884-11-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State Superseded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, 7:21 a.m. UTC 
Separate the logic of split to create vring queue.

This feature is required for subsequent virtuqueue reset vring.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 65 ++++++++++++++++++++++--------------
 1 file changed, 40 insertions(+), 25 deletions(-)

Comments

Jason Wang July 27, 2022, 3:14 a.m. UTC | #1 
在 2022/7/26 15:21, Xuan Zhuo 写道:
> Separate the logic of split to create vring queue.
>
> This feature is required for subsequent virtuqueue reset vring.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>


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


> ---
>   drivers/virtio/virtio_ring.c | 65 ++++++++++++++++++++++--------------
>   1 file changed, 40 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index ba7cc560d823..3817520371ee 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -958,29 +958,19 @@ static void vring_free_split(struct vring_virtqueue_split *vring_split,
>   	kfree(vring_split->desc_extra);
>   }
>   
> -static struct virtqueue *vring_create_virtqueue_split(
> -	unsigned int index,
> -	unsigned int num,
> -	unsigned int vring_align,
> -	struct virtio_device *vdev,
> -	bool weak_barriers,
> -	bool may_reduce_num,
> -	bool context,
> -	bool (*notify)(struct virtqueue *),
> -	void (*callback)(struct virtqueue *),
> -	const char *name)
> +static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
> +				   struct virtio_device *vdev,
> +				   u32 num,
> +				   unsigned int vring_align,
> +				   bool may_reduce_num)
>   {
> -	struct vring_virtqueue_split vring_split = {};
> -	struct virtqueue *vq;
>   	void *queue = NULL;
>   	dma_addr_t dma_addr;
> -	size_t queue_size_in_bytes;
> -	struct vring vring;
>   
>   	/* We assume num is a power of 2. */
>   	if (num & (num - 1)) {
>   		dev_warn(&vdev->dev, "Bad virtqueue length %u\n", num);
> -		return NULL;
> +		return -EINVAL;
>   	}
>   
>   	/* TODO: allocate each queue chunk individually */
> @@ -991,11 +981,11 @@ static struct virtqueue *vring_create_virtqueue_split(
>   		if (queue)
>   			break;
>   		if (!may_reduce_num)
> -			return NULL;
> +			return -ENOMEM;
>   	}
>   
>   	if (!num)
> -		return NULL;
> +		return -ENOMEM;
>   
>   	if (!queue) {
>   		/* Try to get a single page. You are my only hope! */
> @@ -1003,21 +993,46 @@ static struct virtqueue *vring_create_virtqueue_split(
>   					  &dma_addr, GFP_KERNEL|__GFP_ZERO);
>   	}
>   	if (!queue)
> -		return NULL;
> +		return -ENOMEM;
> +
> +	vring_init(&vring_split->vring, num, queue, vring_align);
>   
> -	queue_size_in_bytes = vring_size(num, vring_align);
> -	vring_init(&vring_split.vring, num, queue, vring_align);
> +	vring_split->queue_dma_addr = dma_addr;
> +	vring_split->queue_size_in_bytes = vring_size(num, vring_align);
> +
> +	return 0;
> +}
> +
> +static struct virtqueue *vring_create_virtqueue_split(
> +	unsigned int index,
> +	unsigned int num,
> +	unsigned int vring_align,
> +	struct virtio_device *vdev,
> +	bool weak_barriers,
> +	bool may_reduce_num,
> +	bool context,
> +	bool (*notify)(struct virtqueue *),
> +	void (*callback)(struct virtqueue *),
> +	const char *name)
> +{
> +	struct vring_virtqueue_split vring_split = {};
> +	struct virtqueue *vq;
> +	int err;
> +
> +	err = vring_alloc_queue_split(&vring_split, vdev, num, vring_align,
> +				      may_reduce_num);
> +	if (err)
> +		return NULL;
>   
>   	vq = __vring_new_virtqueue(index, &vring_split, vdev, weak_barriers,
>   				   context, notify, callback, name);
>   	if (!vq) {
> -		vring_free_queue(vdev, queue_size_in_bytes, queue,
> -				 dma_addr);
> +		vring_free_split(&vring_split, vdev);
>   		return NULL;
>   	}
>   
> -	to_vvq(vq)->split.queue_dma_addr = dma_addr;
> -	to_vvq(vq)->split.queue_size_in_bytes = queue_size_in_bytes;
> +	to_vvq(vq)->split.queue_dma_addr = vring_split.queue_dma_addr;
> +	to_vvq(vq)->split.queue_size_in_bytes = vring_split.queue_size_in_bytes;
>   	to_vvq(vq)->we_own_ring = true;
>   
>   	return vq;
diff mbox series

Patch

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index ba7cc560d823..3817520371ee 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -958,29 +958,19 @@  static void vring_free_split(struct vring_virtqueue_split *vring_split,
 	kfree(vring_split->desc_extra);
 }
 
-static struct virtqueue *vring_create_virtqueue_split(
-	unsigned int index,
-	unsigned int num,
-	unsigned int vring_align,
-	struct virtio_device *vdev,
-	bool weak_barriers,
-	bool may_reduce_num,
-	bool context,
-	bool (*notify)(struct virtqueue *),
-	void (*callback)(struct virtqueue *),
-	const char *name)
+static int vring_alloc_queue_split(struct vring_virtqueue_split *vring_split,
+				   struct virtio_device *vdev,
+				   u32 num,
+				   unsigned int vring_align,
+				   bool may_reduce_num)
 {
-	struct vring_virtqueue_split vring_split = {};
-	struct virtqueue *vq;
 	void *queue = NULL;
 	dma_addr_t dma_addr;
-	size_t queue_size_in_bytes;
-	struct vring vring;
 
 	/* We assume num is a power of 2. */
 	if (num & (num - 1)) {
 		dev_warn(&vdev->dev, "Bad virtqueue length %u\n", num);
-		return NULL;
+		return -EINVAL;
 	}
 
 	/* TODO: allocate each queue chunk individually */
@@ -991,11 +981,11 @@  static struct virtqueue *vring_create_virtqueue_split(
 		if (queue)
 			break;
 		if (!may_reduce_num)
-			return NULL;
+			return -ENOMEM;
 	}
 
 	if (!num)
-		return NULL;
+		return -ENOMEM;
 
 	if (!queue) {
 		/* Try to get a single page. You are my only hope! */
@@ -1003,21 +993,46 @@  static struct virtqueue *vring_create_virtqueue_split(
 					  &dma_addr, GFP_KERNEL|__GFP_ZERO);
 	}
 	if (!queue)
-		return NULL;
+		return -ENOMEM;
+
+	vring_init(&vring_split->vring, num, queue, vring_align);
 
-	queue_size_in_bytes = vring_size(num, vring_align);
-	vring_init(&vring_split.vring, num, queue, vring_align);
+	vring_split->queue_dma_addr = dma_addr;
+	vring_split->queue_size_in_bytes = vring_size(num, vring_align);
+
+	return 0;
+}
+
+static struct virtqueue *vring_create_virtqueue_split(
+	unsigned int index,
+	unsigned int num,
+	unsigned int vring_align,
+	struct virtio_device *vdev,
+	bool weak_barriers,
+	bool may_reduce_num,
+	bool context,
+	bool (*notify)(struct virtqueue *),
+	void (*callback)(struct virtqueue *),
+	const char *name)
+{
+	struct vring_virtqueue_split vring_split = {};
+	struct virtqueue *vq;
+	int err;
+
+	err = vring_alloc_queue_split(&vring_split, vdev, num, vring_align,
+				      may_reduce_num);
+	if (err)
+		return NULL;
 
 	vq = __vring_new_virtqueue(index, &vring_split, vdev, weak_barriers,
 				   context, notify, callback, name);
 	if (!vq) {
-		vring_free_queue(vdev, queue_size_in_bytes, queue,
-				 dma_addr);
+		vring_free_split(&vring_split, vdev);
 		return NULL;
 	}
 
-	to_vvq(vq)->split.queue_dma_addr = dma_addr;
-	to_vvq(vq)->split.queue_size_in_bytes = queue_size_in_bytes;
+	to_vvq(vq)->split.queue_dma_addr = vring_split.queue_dma_addr;
+	to_vvq(vq)->split.queue_size_in_bytes = vring_split.queue_size_in_bytes;
 	to_vvq(vq)->we_own_ring = true;
 
 	return vq;