linux-kernel - Re: [PATCH v2 13/17] vdpa_sim: set vringh notify callback

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Date:   Mon, 30 Nov 2020 15:16:27 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Laurent Vivier <lvivier@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, Eli Cohen <elic@...dia.com>
Subject: Re: [PATCH v2 13/17] vdpa_sim: set vringh notify callback

On Mon, Nov 30, 2020 at 11:27:51AM +0800, Jason Wang wrote:
>
>On 2020/11/26 下午10:49, Stefano Garzarella wrote:
>>Instead of calling the vq callback directly, we can leverage the
>>vringh_notify() function, adding vdpasim_vq_notify() and setting it
>>in the vringh notify callback.
>>
>>Suggested-by: Jason Wang <jasowang@...hat.com>
>>Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
>>---
>>  drivers/vdpa/vdpa_sim/vdpa_sim.c | 21 +++++++++++++++++----
>>  1 file changed, 17 insertions(+), 4 deletions(-)
>>
>>diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>>index 8b87ce0485b6..4327efd6d41e 100644
>>--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
>>+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
>>@@ -120,6 +120,17 @@ static struct vdpasim *dev_to_sim(struct device *dev)
>>  	return vdpa_to_sim(vdpa);
>>  }
>>+static void vdpasim_vq_notify(struct vringh *vring)
>>+{
>>+	struct vdpasim_virtqueue *vq =
>>+		container_of(vring, struct vdpasim_virtqueue, vring);
>>+
>>+	if (!vq->cb)
>>+		return;
>>+
>>+	vq->cb(vq->private);
>>+}
>>+
>>  static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
>>  {
>>  	struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
>>@@ -131,6 +142,8 @@ static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
>>  			  (uintptr_t)vq->driver_addr,
>>  			  (struct vring_used *)
>>  			  (uintptr_t)vq->device_addr);
>>+
>>+	vq->vring.notify = vdpasim_vq_notify;
>
>
>Do we need to clear notify during reset?

Right, I'll clear it.

>
>Other looks good.
>

Thanks,
Stefano