netdev - Re: [PATCH V4 3/4] vhost_vdpa: don't setup irq offloading when irq

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Date:   Mon, 14 Feb 2022 14:28:25 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH V4 3/4] vhost_vdpa: don't setup irq offloading when
 irq_num < 0


在 2022/2/3 下午3:27, Zhu Lingshan 写道:
> When irq number is negative(e.g., -EINVAL), the virtqueue
> may be disabled or the virtqueues are sharing a device irq.
> In such case, we should not setup irq offloading for a virtqueue.
>
> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
> ---
>   drivers/vhost/vdpa.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 851539807bc9..c4fcacb0de3a 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -96,6 +96,10 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
>   	if (!ops->get_vq_irq)
>   		return;
>   
> +	irq = ops->get_vq_irq(vdpa, qid);
> +	if (irq < 0)
> +		return;
> +
>   	irq = ops->get_vq_irq(vdpa, qid);


So the get_vq_irq() will be called twice?


>   	irq_bypass_unregister_producer(&vq->call_ctx.producer);
>   	if (!vq->call_ctx.ctx || irq < 0)


We're already checked irq against 0 here.

Thanks