netdev - Re: [RFC net-next 1/2] usb: class: cdc-wdm: add control type

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Date:   Fri, 30 Apr 2021 12:32:05 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org, kuba@...nel.org,
        bjorn@...k.no
Subject: Re: [RFC net-next 1/2] usb: class: cdc-wdm: add control type

Am Freitag, den 30.04.2021, 12:16 +0200 schrieb Loic Poulain:
> Add type parameter to usb_cdc_wdm_register function in order to
> specify which control protocol the cdc-wdm channel is transporting.
> It will be required for exposing the channel(s) through WWAN framework.

Hi,

that is an interesting framework.
Some issues though.

	Regards
		Oliver

> +/**
> + * enum usb_cdc_wdm_type - CDC WDM endpoint type
> + * @USB_CDC_WDM_UNKNOWN: Unknown type
> + * @USB_CDC_WDM_MBIM: Mobile Broadband Interface Model control
> + * @USB_CDC_WDM_QMI: Qualcomm Modem Interface for modem control
> + * @USB_CDC_WDM_AT: AT commands interface
> + */
> +enum usb_cdc_wdm_type {
> +	USB_CDC_WDM_UNKNOWN,
> +	USB_CDC_WDM_MBIM,
> +	USB_CDC_WDM_QMI,
> +	USB_CDC_WDM_AT
> +};


If this is supposed to integrate CDC-WDM into a larger subsystem, what
use are private types here? If you do this the protocols need to come
from the common framework.