linux-kernel - Re: [PATCH v3 02/11] vdpa: Add set/get_vq_affinity callbacks in vdpa_config

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Date:   Thu, 16 Mar 2023 11:27:04 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xie Yongji <xieyongji@...edance.com>, mst@...hat.com,
        tglx@...utronix.de, hch@....de
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 02/11] vdpa: Add set/get_vq_affinity callbacks in
 vdpa_config_ops


在 2023/2/28 17:41, Xie Yongji 写道:
> This introduces set/get_vq_affinity callbacks in
> vdpa_config_ops to support interrupt affinity
> management for vdpa device drivers.
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> ---
>   drivers/virtio/virtio_vdpa.c | 28 ++++++++++++++++++++++++++++
>   include/linux/vdpa.h         | 13 +++++++++++++
>   2 files changed, 41 insertions(+)
>
> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> index d7f5af62ddaa..f72696b4c1c2 100644
> --- a/drivers/virtio/virtio_vdpa.c
> +++ b/drivers/virtio/virtio_vdpa.c
> @@ -337,6 +337,32 @@ static const char *virtio_vdpa_bus_name(struct virtio_device *vdev)
>   	return dev_name(&vdpa->dev);
>   }
>   
> +static int virtio_vdpa_set_vq_affinity(struct virtqueue *vq,
> +				       const struct cpumask *cpu_mask)
> +{
> +	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vq->vdev);
> +	struct vdpa_device *vdpa = vd_dev->vdpa;
> +	const struct vdpa_config_ops *ops = vdpa->config;
> +	unsigned int index = vq->index;
> +
> +	if (ops->set_vq_affinity)
> +		return ops->set_vq_affinity(vdpa, index, cpu_mask);
> +
> +	return 0;
> +}
> +
> +static const struct cpumask *
> +virtio_vdpa_get_vq_affinity(struct virtio_device *vdev, int index)
> +{
> +	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
> +	const struct vdpa_config_ops *ops = vdpa->config;
> +
> +	if (ops->get_vq_affinity)
> +		return ops->get_vq_affinity(vdpa, index);
> +
> +	return NULL;
> +}
> +
>   static const struct virtio_config_ops virtio_vdpa_config_ops = {
>   	.get		= virtio_vdpa_get,
>   	.set		= virtio_vdpa_set,
> @@ -349,6 +375,8 @@ static const struct virtio_config_ops virtio_vdpa_config_ops = {
>   	.get_features	= virtio_vdpa_get_features,
>   	.finalize_features = virtio_vdpa_finalize_features,
>   	.bus_name	= virtio_vdpa_bus_name,
> +	.set_vq_affinity = virtio_vdpa_set_vq_affinity,
> +	.get_vq_affinity = virtio_vdpa_get_vq_affinity,
>   };
>   
>   static void virtio_vdpa_release_dev(struct device *_d)
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 43f59ef10cc9..d61f369f9cd6 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -250,6 +250,15 @@ struct vdpa_map_file {
>    *				@vdev: vdpa device
>    *				Returns the iova range supported by
>    *				the device.
> + * @set_vq_affinity:		Set the irq affinity of virtqueue (optional)


Nit: it's better not mention IRQ here because the virtqueue notification 
is not necessarily backed on IRQ.

Thanks


> + *				@vdev: vdpa device
> + *				@idx: virtqueue index
> + *				@cpu_mask: irq affinity mask
> + *				Returns integer: success (0) or error (< 0)
> + * @get_vq_affinity:		Get the irq affinity of virtqueue (optional)
> + *				@vdev: vdpa device
> + *				@idx: virtqueue index
> + *				Returns the irq affinity mask
>    * @set_group_asid:		Set address space identifier for a
>    *				virtqueue group (optional)
>    *				@vdev: vdpa device
> @@ -340,6 +349,10 @@ struct vdpa_config_ops {
>   			   const void *buf, unsigned int len);
>   	u32 (*get_generation)(struct vdpa_device *vdev);
>   	struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev);
> +	int (*set_vq_affinity)(struct vdpa_device *vdev, u16 idx,
> +			       const struct cpumask *cpu_mask);
> +	const struct cpumask *(*get_vq_affinity)(struct vdpa_device *vdev,
> +						 u16 idx);
>   
>   	/* DMA ops */
>   	int (*set_map)(struct vdpa_device *vdev, unsigned int asid,