netdev - Re: [PATCH 2/2] vhost/test: fix build for vhost test

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Date:   Fri, 30 Aug 2019 11:38:16 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tiwei Bie <tiwei.bie@...el.com>, mst@...hat.com
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 2/2] vhost/test: fix build for vhost test


On 2019/8/28 下午1:37, Tiwei Bie wrote:
> Since vhost_exceeds_weight() was introduced, callers need to specify
> the packet weight and byte weight in vhost_dev_init(). Note that, the
> packet weight isn't counted in this patch to keep the original behavior
> unchanged.
>
> Fixes: e82b9b0727ff ("vhost: introduce vhost_exceeds_weight()")
> Cc: stable@...r.kernel.org
> Signed-off-by: Tiwei Bie <tiwei.bie@...el.com>
> ---
>  drivers/vhost/test.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
> index ac4f762c4f65..7804869c6a31 100644
> --- a/drivers/vhost/test.c
> +++ b/drivers/vhost/test.c
> @@ -22,6 +22,12 @@
>   * Using this limit prevents one virtqueue from starving others. */
>  #define VHOST_TEST_WEIGHT 0x80000
>  
> +/* Max number of packets transferred before requeueing the job.
> + * Using this limit prevents one virtqueue from starving others with
> + * pkts.
> + */
> +#define VHOST_TEST_PKT_WEIGHT 256
> +
>  enum {
>  	VHOST_TEST_VQ = 0,
>  	VHOST_TEST_VQ_MAX = 1,
> @@ -80,10 +86,8 @@ static void handle_vq(struct vhost_test *n)
>  		}
>  		vhost_add_used_and_signal(&n->dev, vq, head, 0);
>  		total_len += len;
> -		if (unlikely(total_len >= VHOST_TEST_WEIGHT)) {
> -			vhost_poll_queue(&vq->poll);
> +		if (unlikely(vhost_exceeds_weight(vq, 0, total_len)))
>  			break;
> -		}
>  	}
>  
>  	mutex_unlock(&vq->mutex);
> @@ -115,7 +119,8 @@ static int vhost_test_open(struct inode *inode, struct file *f)
>  	dev = &n->dev;
>  	vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ];
>  	n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick;
> -	vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV);
> +	vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV,
> +		       VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT);
>  
>  	f->private_data = n;
>  


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