netdev - Re: [PATCH V4 4/6] mdev: introduce virtio device and its device ops

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Message-ID: <a2a8e447-c778-59db-071a-ffa348a69bb8@redhat.com>
Date:   Fri, 18 Oct 2019 18:57:22 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tiwei Bie <tiwei.bie@...el.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
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Subject: Re: [PATCH V4 4/6] mdev: introduce virtio device and its device ops


On 2019/10/18 下午5:46, Tiwei Bie wrote:
> On Thu, Oct 17, 2019 at 06:48:34PM +0800, Jason Wang wrote:
>> + * @get_vq_state:		Get the state for a virtqueue
>> + *				@mdev: mediated device
>> + *				@idx: virtqueue index
>> + *				Returns virtqueue state (last_avail_idx)
>> + * @get_vq_align:		Get the virtqueue align requirement
>> + *				for the device
>> + *				@mdev: mediated device
>> + *				Returns virtqueue algin requirement
>> + * @get_features:		Get virtio features supported by the device
>> + *				@mdev: mediated device
>> + *				Returns the virtio features support by the
>> + *				device
>> + * @get_features:		Set virtio features supported by the driver
> s/get_features/set_features/


Will fix.


>
>> + *				configration space
>> + * @get_mdev_features:		Get the feature of virtio mdev device
>> + *				@mdev: mediated device
>> + *				Returns the mdev features (API) support by
>> + *				the device.
>> + * @get_generation:		Get device generaton
>> + *				@mdev: mediated device
>> + *				Returns u32: device generation
>> + */
>> +struct virtio_mdev_device_ops {
>> +	/* Virtqueue ops */
>> +	int (*set_vq_address)(struct mdev_device *mdev,
>> +			      u16 idx, u64 desc_area, u64 driver_area,
>> +			      u64 device_area);
>> +	void (*set_vq_num)(struct mdev_device *mdev, u16 idx, u32 num);
>> +	void (*kick_vq)(struct mdev_device *mdev, u16 idx);
>> +	void (*set_vq_cb)(struct mdev_device *mdev, u16 idx,
>> +			  struct virtio_mdev_callback *cb);
>> +	void (*set_vq_ready)(struct mdev_device *mdev, u16 idx, bool ready);
>> +	bool (*get_vq_ready)(struct mdev_device *mdev, u16 idx);
>> +	int (*set_vq_state)(struct mdev_device *mdev, u16 idx, u64 state);
>> +	u64 (*get_vq_state)(struct mdev_device *mdev, u16 idx);
>> +
>> +	/* Device ops */
>> +	u16 (*get_vq_align)(struct mdev_device *mdev);
>> +	u64 (*get_features)(struct mdev_device *mdev);
>> +	int (*set_features)(struct mdev_device *mdev, u64 features);
>> +	void (*set_config_cb)(struct mdev_device *mdev,
>> +			      struct virtio_mdev_callback *cb);
>> +	u16 (*get_vq_num_max)(struct mdev_device *mdev);
>> +	u32 (*get_device_id)(struct mdev_device *mdev);
>> +	u32 (*get_vendor_id)(struct mdev_device *mdev);
>> +	u8 (*get_status)(struct mdev_device *mdev);
>> +	void (*set_status)(struct mdev_device *mdev, u8 status);
>> +	void (*get_config)(struct mdev_device *mdev, unsigned int offset,
>> +			   void *buf, unsigned int len);
>> +	void (*set_config)(struct mdev_device *mdev, unsigned int offset,
>> +			   const void *buf, unsigned int len);
>> +	u64 (*get_mdev_features)(struct mdev_device *mdev);
> Do we need a .set_mdev_features method as well?


Good question. To me I think we may document that the API provides 
backward compatibility, so there's no need for set_mdev_features. Or is 
there any other chance that we need that?


>
> It's not very clear what does mdev_features mean.
> Does it mean the vhost backend features?
>
> https://github.com/torvalds/linux/blob/0e2adab6cf285c41e825b6c74a3aa61324d1132c/include/uapi/linux/vhost.h#L93-L94


Something like this, it's kind of the version of the API, except for the 
_F_VERSION_1, the first user should be _F_LOG_ALL. I will add more docs 
for this API.

Thanks


>
>
>> +	u32 (*get_generation)(struct mdev_device *mdev);
>> +};
>> +
>> +void mdev_set_virtio_ops(struct mdev_device *mdev,
>> +			 const struct virtio_mdev_device_ops *virtio_ops);
>> +
>> +#endif
>> -- 
>> 2.19.1
>>