linux-kernel - Re: [PATCH V3 18/19] virtio_ring: factor out split detaching logic

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Message-ID: <20250701024506-mutt-send-email-mst@kernel.org>
Date: Tue, 1 Jul 2025 02:45:47 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Jason Wang <jasowang@...hat.com>
Cc: xuanzhuo@...ux.alibaba.com, eperezma@...hat.com,
	virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 18/19] virtio_ring: factor out split detaching logic

On Mon, Jun 16, 2025 at 04:25:16PM +0800, Jason Wang wrote:
> This patch factors out the split core detaching logic that could be
> reused by in order feature into a dedicated function.

you mean 

Factor out the split core detaching logic  into a dedicated function
so it cn be reused by the in order feature


> 
> Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/virtio/virtio_ring.c | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 259380797ec4..27a9459a0555 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -804,8 +804,9 @@ static void detach_indirect_split(struct vring_virtqueue *vq,
>  	vq->split.desc_state[head].indir_desc = NULL;
>  }
>  
> -static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head,
> -			     void **ctx)
> +static unsigned detach_buf_split_in_order(struct vring_virtqueue *vq,
> +					  unsigned int head,
> +					  void **ctx)
>  {
>  	struct vring_desc_extra *extra;
>  	unsigned int i;
> @@ -826,8 +827,6 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head,
>  	}
>  
>  	vring_unmap_one_split(vq, &extra[i]);
> -	vq->split.desc_extra[i].next = vq->free_head;
> -	vq->free_head = head;
>  
>  	/* Plus final descriptor */
>  	vq->vq.num_free++;
> @@ -836,6 +835,17 @@ static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head,
>  		detach_indirect_split(vq, head);
>  	else if (ctx)
>  		*ctx = vq->split.desc_state[head].indir_desc;
> +
> +	return i;
> +}
> +
> +static void detach_buf_split(struct vring_virtqueue *vq, unsigned int head,
> +			     void **ctx)
> +{
> +	unsigned int i = detach_buf_split_in_order(vq, head, ctx);
> +
> +	vq->split.desc_extra[i].next = vq->free_head;
> +	vq->free_head = head;
>  }
>  
>  static bool virtqueue_poll_split(const struct vring_virtqueue *vq,
> -- 
> 2.34.1