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@xxxxxxxxxxxxxxx
> Signed-off-by: Tiwei Bie <tiwei.bie@xxxxxxxxx>
> ---
> 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@xxxxxxxxxx>
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