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Date: Tue, 2 Mar 2021 12:14:13 +0800
From: Jason Wang <jasowang@...hat.com>
To: Stefano Garzarella <sgarzare@...hat.com>,
virtualization@...ts.linux-foundation.org
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [RFC PATCH 01/10] vdpa: add get_config_size callback in
vdpa_config_ops
On 2021/2/16 5:44 下午, Stefano Garzarella wrote:
> This new callback is used to get the size of the configuration space
> of vDPA devices.
>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
> include/linux/vdpa.h | 4 ++++
> drivers/vdpa/ifcvf/ifcvf_main.c | 6 ++++++
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 6 ++++++
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 9 +++++++++
> 4 files changed, 25 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 4ab5494503a8..fddf42b17573 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -150,6 +150,9 @@ struct vdpa_iova_range {
> * @set_status: Set the device status
> * @vdev: vdpa device
> * @status: virtio device status
> + * @get_config_size: Get the size of the configuration space
> + * @vdev: vdpa device
> + * Returns size_t: configuration size
Rethink about this, how much we could gain by introducing a dedicated
ops here? E.g would it be simpler if we simply introduce a
max_config_size to vdpa device?
Thanks
> * @get_config: Read from device specific configuration space
> * @vdev: vdpa device
> * @offset: offset from the beginning of
> @@ -231,6 +234,7 @@ struct vdpa_config_ops {
> u32 (*get_vendor_id)(struct vdpa_device *vdev);
> u8 (*get_status)(struct vdpa_device *vdev);
> void (*set_status)(struct vdpa_device *vdev, u8 status);
> + size_t (*get_config_size)(struct vdpa_device *vdev);
> void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> void *buf, unsigned int len);
> void (*set_config)(struct vdpa_device *vdev, unsigned int offset,
> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> index 7c8bbfcf6c3e..2443271e17d2 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> @@ -332,6 +332,11 @@ static u32 ifcvf_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
> return IFCVF_QUEUE_ALIGNMENT;
> }
>
> +static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
> +{
> + return sizeof(struct virtio_net_config);
> +}
> +
> static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
> unsigned int offset,
> void *buf, unsigned int len)
> @@ -392,6 +397,7 @@ static const struct vdpa_config_ops ifc_vdpa_ops = {
> .get_device_id = ifcvf_vdpa_get_device_id,
> .get_vendor_id = ifcvf_vdpa_get_vendor_id,
> .get_vq_align = ifcvf_vdpa_get_vq_align,
> + .get_config_size = ifcvf_vdpa_get_config_size,
> .get_config = ifcvf_vdpa_get_config,
> .set_config = ifcvf_vdpa_set_config,
> .set_config_cb = ifcvf_vdpa_set_config_cb,
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index 10e9b09932eb..78043ee567b6 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1814,6 +1814,11 @@ static void mlx5_vdpa_set_status(struct vdpa_device *vdev, u8 status)
> ndev->mvdev.status |= VIRTIO_CONFIG_S_FAILED;
> }
>
> +static size_t mlx5_vdpa_get_config_size(struct vdpa_device *vdev)
> +{
> + return sizeof(struct virtio_net_config);
> +}
> +
> static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, void *buf,
> unsigned int len)
> {
> @@ -1900,6 +1905,7 @@ static const struct vdpa_config_ops mlx5_vdpa_ops = {
> .get_vendor_id = mlx5_vdpa_get_vendor_id,
> .get_status = mlx5_vdpa_get_status,
> .set_status = mlx5_vdpa_set_status,
> + .get_config_size = mlx5_vdpa_get_config_size,
> .get_config = mlx5_vdpa_get_config,
> .set_config = mlx5_vdpa_set_config,
> .get_generation = mlx5_vdpa_get_generation,
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index d5942842432d..779ae6c144d7 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -439,6 +439,13 @@ static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
> spin_unlock(&vdpasim->lock);
> }
>
> +static size_t vdpasim_get_config_size(struct vdpa_device *vdpa)
> +{
> + struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> +
> + return vdpasim->dev_attr.config_size;
> +}
> +
> static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
> void *buf, unsigned int len)
> {
> @@ -566,6 +573,7 @@ static const struct vdpa_config_ops vdpasim_config_ops = {
> .get_vendor_id = vdpasim_get_vendor_id,
> .get_status = vdpasim_get_status,
> .set_status = vdpasim_set_status,
> + .get_config_size = vdpasim_get_config_size,
> .get_config = vdpasim_get_config,
> .set_config = vdpasim_set_config,
> .get_generation = vdpasim_get_generation,
> @@ -593,6 +601,7 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
> .get_vendor_id = vdpasim_get_vendor_id,
> .get_status = vdpasim_get_status,
> .set_status = vdpasim_set_status,
> + .get_config_size = vdpasim_get_config_size,
> .get_config = vdpasim_get_config,
> .set_config = vdpasim_set_config,
> .get_generation = vdpasim_get_generation,
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