Re: [PATCH v13 18/42] virtio_ring: packed: extract the logic of alloc queue

[Jason Wang <jasowang@xxxxxxxxxx>]

在 2022/7/26 15:22, Xuan Zhuo 写道:
> Separate the logic of packed to create vring queue.
>
> This feature is required for subsequent virtuqueue reset vring.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


> ---
>   drivers/virtio/virtio_ring.c | 80 +++++++++++++++++++++++-------------
>   1 file changed, 51 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 891900b31c3d..10cc2b7e3588 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -1857,19 +1857,10 @@ static void vring_free_packed(struct vring_virtqueue_packed *vring_packed,
>   	kfree(vring_packed->desc_extra);
>   }
>   
> -static struct virtqueue *vring_create_virtqueue_packed(
> -	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_packed(struct vring_virtqueue_packed *vring_packed,
> +				    struct virtio_device *vdev,
> +				    u32 num)
>   {
> -	struct vring_virtqueue *vq;
>   	struct vring_packed_desc *ring;
>   	struct vring_packed_desc_event *driver, *device;
>   	dma_addr_t ring_dma_addr, driver_event_dma_addr, device_event_dma_addr;
> @@ -1881,7 +1872,11 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   				 &ring_dma_addr,
>   				 GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
>   	if (!ring)
> -		goto err_ring;
> +		goto err;
> +
> +	vring_packed->vring.desc         = ring;
> +	vring_packed->ring_dma_addr      = ring_dma_addr;
> +	vring_packed->ring_size_in_bytes = ring_size_in_bytes;
>   
>   	event_size_in_bytes = sizeof(struct vring_packed_desc_event);
>   
> @@ -1889,13 +1884,47 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   				   &driver_event_dma_addr,
>   				   GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
>   	if (!driver)
> -		goto err_driver;
> +		goto err;
> +
> +	vring_packed->vring.driver          = driver;
> +	vring_packed->event_size_in_bytes   = event_size_in_bytes;
> +	vring_packed->driver_event_dma_addr = driver_event_dma_addr;
>   
>   	device = vring_alloc_queue(vdev, event_size_in_bytes,
>   				   &device_event_dma_addr,
>   				   GFP_KERNEL|__GFP_NOWARN|__GFP_ZERO);
>   	if (!device)
> -		goto err_device;
> +		goto err;
> +
> +	vring_packed->vring.device          = device;
> +	vring_packed->device_event_dma_addr = device_event_dma_addr;
> +
> +	vring_packed->vring.num = num;
> +
> +	return 0;
> +
> +err:
> +	vring_free_packed(vring_packed, vdev);
> +	return -ENOMEM;
> +}
> +
> +static struct virtqueue *vring_create_virtqueue_packed(
> +	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_packed vring_packed = {};
> +	struct vring_virtqueue *vq;
> +
> +	if (vring_alloc_queue_packed(&vring_packed, vdev, num))
> +		goto err_ring;
>   
>   	vq = kmalloc(sizeof(*vq), GFP_KERNEL);
>   	if (!vq)
> @@ -1918,17 +1947,14 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   	vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC) &&
>   		!context;
>   
> -	vq->packed.ring_dma_addr = ring_dma_addr;
> -	vq->packed.driver_event_dma_addr = driver_event_dma_addr;
> -	vq->packed.device_event_dma_addr = device_event_dma_addr;
> +	vq->packed.ring_dma_addr = vring_packed.ring_dma_addr;
> +	vq->packed.driver_event_dma_addr = vring_packed.driver_event_dma_addr;
> +	vq->packed.device_event_dma_addr = vring_packed.device_event_dma_addr;
>   
> -	vq->packed.ring_size_in_bytes = ring_size_in_bytes;
> -	vq->packed.event_size_in_bytes = event_size_in_bytes;
> +	vq->packed.ring_size_in_bytes = vring_packed.ring_size_in_bytes;
> +	vq->packed.event_size_in_bytes = vring_packed.event_size_in_bytes;
>   
> -	vq->packed.vring.num = num;
> -	vq->packed.vring.desc = ring;
> -	vq->packed.vring.driver = driver;
> -	vq->packed.vring.device = device;
> +	vq->packed.vring = vring_packed.vring;
>   
>   	vq->packed.next_avail_idx = 0;
>   	vq->packed.avail_wrap_counter = 1;
> @@ -1967,11 +1993,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   err_desc_state:
>   	kfree(vq);
>   err_vq:
> -	vring_free_queue(vdev, event_size_in_bytes, device, device_event_dma_addr);
> -err_device:
> -	vring_free_queue(vdev, event_size_in_bytes, driver, driver_event_dma_addr);
> -err_driver:
> -	vring_free_queue(vdev, ring_size_in_bytes, ring, ring_dma_addr);
> +	vring_free_packed(&vring_packed, vdev);
>   err_ring:
>   	return NULL;
>   }