linux-kernel - Re: [PATCH 2/7] virtio-pci library: switch to use vp_modern_map_vq

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Date:   Wed, 21 Apr 2021 10:44:53 +0300
From:   Eli Cohen <elic@...dia.com>
To:     Jason Wang <jasowang@...hat.com>
CC:     <mst@...hat.com>, <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] virtio-pci library: switch to use
 vp_modern_map_vq_notify()

On Thu, Apr 15, 2021 at 03:31:42AM -0400, Jason Wang wrote:
> This patch switch to use vp_modern_map_notify() for virtio-pci
> library.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Reviewed-by: Eli Cohen <elic@...dia.com>

> ---
>  drivers/virtio/virtio_pci_modern.c | 27 ++-------------------------
>  1 file changed, 2 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> index fbd4ebc00eb6..29607d9bd95c 100644
> --- a/drivers/virtio/virtio_pci_modern.c
> +++ b/drivers/virtio/virtio_pci_modern.c
> @@ -192,7 +192,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
>  
>  	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
>  	struct virtqueue *vq;
> -	u16 num, off;
> +	u16 num;
>  	int err;
>  
>  	if (index >= vp_modern_get_num_queues(mdev))
> @@ -208,9 +208,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
>  		return ERR_PTR(-EINVAL);
>  	}
>  
> -	/* get offset of notification word for this vq */
> -	off = vp_modern_get_queue_notify_off(mdev, index);
> -
>  	info->msix_vector = msix_vec;
>  
>  	/* create the vring */
> @@ -227,27 +224,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
>  				virtqueue_get_avail_addr(vq),
>  				virtqueue_get_used_addr(vq));
>  
> -	if (mdev->notify_base) {
> -		/* offset should not wrap */
> -		if ((u64)off * mdev->notify_offset_multiplier + 2
> -		    > mdev->notify_len) {
> -			dev_warn(&mdev->pci_dev->dev,
> -				 "bad notification offset %u (x %u) "
> -				 "for queue %u > %zd",
> -				 off, mdev->notify_offset_multiplier,
> -				 index, mdev->notify_len);
> -			err = -EINVAL;
> -			goto err_map_notify;
> -		}
> -		vq->priv = (void __force *)mdev->notify_base +
> -			off * mdev->notify_offset_multiplier;
> -	} else {
> -		vq->priv = (void __force *)vp_modern_map_capability(mdev,
> -							  mdev->notify_map_cap, 2, 2,
> -							  off * mdev->notify_offset_multiplier, 2,
> -							  NULL);
> -	}
> -
> +	vq->priv = vp_modern_map_vq_notify(mdev, index);
>  	if (!vq->priv) {
>  		err = -ENOMEM;
>  		goto err_map_notify;
> -- 
> 2.18.1
>