linux-kernel - Re: [PATCH v2 06/17] vdpa_sim: add struct vdpasim_dev

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Date:   Mon, 30 Nov 2020 11:09:18 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        virtualization@...ts.linux-foundation.org
Cc:     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 06/17] vdpa_sim: add struct vdpasim_dev_attr for device
 attributes


On 2020/11/26 下午10:49, Stefano Garzarella wrote:
> vdpasim_dev_attr will contain device specific attributes. We starting
> moving the number of virtqueues (i.e. nvqs) to vdpasim_dev_attr.
>
> vdpasim_create() creates a new vDPA simulator following the device
> attributes defined in the vdpasim_dev_attr parameter.
>
> Co-developed-by: Max Gurtovoy <mgurtovoy@...dia.com>
> Signed-off-by: Max Gurtovoy <mgurtovoy@...dia.com>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
>   drivers/vdpa/vdpa_sim/vdpa_sim.c | 25 +++++++++++++++++--------
>   1 file changed, 17 insertions(+), 8 deletions(-)


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


>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 62204e064841..f98262add0e1 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -55,11 +55,16 @@ static u64 vdpasim_features = (1ULL << VIRTIO_F_ANY_LAYOUT) |
>   			      (1ULL << VIRTIO_F_ACCESS_PLATFORM) |
>   			      (1ULL << VIRTIO_NET_F_MAC);
>   
> +struct vdpasim_dev_attr {
> +	int nvqs;
> +};
> +
>   /* State of each vdpasim device */
>   struct vdpasim {
>   	struct vdpa_device vdpa;
>   	struct vdpasim_virtqueue *vqs;
>   	struct work_struct work;
> +	struct vdpasim_dev_attr dev_attr;
>   	/* spinlock to synchronize virtqueue state */
>   	spinlock_t lock;
>   	struct virtio_net_config config;
> @@ -68,7 +73,6 @@ struct vdpasim {
>   	u32 status;
>   	u32 generation;
>   	u64 features;
> -	int nvqs;
>   	/* spinlock to synchronize iommu table */
>   	spinlock_t iommu_lock;
>   };
> @@ -133,7 +137,7 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
>   {
>   	int i;
>   
> -	for (i = 0; i < vdpasim->nvqs; i++)
> +	for (i = 0; i < vdpasim->dev_attr.nvqs; i++)
>   		vdpasim_vq_reset(&vdpasim->vqs[i]);
>   
>   	spin_lock(&vdpasim->iommu_lock);
> @@ -334,7 +338,7 @@ static const struct dma_map_ops vdpasim_dma_ops = {
>   static const struct vdpa_config_ops vdpasim_config_ops;
>   static const struct vdpa_config_ops vdpasim_batch_config_ops;
>   
> -static struct vdpasim *vdpasim_create(void)
> +static struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
>   {
>   	const struct vdpa_config_ops *ops;
>   	struct vdpasim *vdpasim;
> @@ -346,11 +350,12 @@ static struct vdpasim *vdpasim_create(void)
>   	else
>   		ops = &vdpasim_config_ops;
>   
> -	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, VDPASIM_VQ_NUM);
> +	vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
> +				    dev_attr->nvqs);
>   	if (!vdpasim)
>   		goto err_alloc;
>   
> -	vdpasim->nvqs = VDPASIM_VQ_NUM;
> +	vdpasim->dev_attr = *dev_attr;
>   	INIT_WORK(&vdpasim->work, vdpasim_work);
>   	spin_lock_init(&vdpasim->lock);
>   	spin_lock_init(&vdpasim->iommu_lock);
> @@ -361,7 +366,7 @@ static struct vdpasim *vdpasim_create(void)
>   		goto err_iommu;
>   	set_dma_ops(dev, &vdpasim_dma_ops);
>   
> -	vdpasim->vqs = kcalloc(vdpasim->nvqs, sizeof(struct vdpasim_virtqueue),
> +	vdpasim->vqs = kcalloc(dev_attr->nvqs, sizeof(struct vdpasim_virtqueue),
>   			       GFP_KERNEL);
>   	if (!vdpasim->vqs)
>   		goto err_iommu;
> @@ -384,7 +389,7 @@ static struct vdpasim *vdpasim_create(void)
>   		eth_random_addr(vdpasim->config.mac);
>   	}
>   
> -	for (i = 0; i < vdpasim->nvqs; i++)
> +	for (i = 0; i < dev_attr->nvqs; i++)
>   		vringh_set_iotlb(&vdpasim->vqs[i].vring, vdpasim->iommu);
>   
>   	vdpasim->vdpa.dma_dev = dev;
> @@ -712,7 +717,11 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
>   
>   static int __init vdpasim_dev_init(void)
>   {
> -	vdpasim_dev = vdpasim_create();
> +	struct vdpasim_dev_attr dev_attr = {};
> +
> +	dev_attr.nvqs = VDPASIM_VQ_NUM;
> +
> +	vdpasim_dev = vdpasim_create(&dev_attr);
>   
>   	if (!IS_ERR(vdpasim_dev))
>   		return 0;