Re: [PATCH] TODO FLAG_POINTTOPOINT => FLAG_WWAN? usbnet/cdc_ncm: mark ncm devices as "mobile broadband devices" with FLAG_WWAN

From: Oliver Neukum
Date: Fri Jun 03 2011 - 06:48:39 EST

Am Freitag, 3. Juni 2011, 12:23:21 schrieb Alexey ORISHKO:

> There is no difference between cdc_ncm and cdc_ether devices, besides
> the fact cdc_ncm is more efficient in data transfer and cpu load.
> The problem is that you cannot say much about device functionality based
> just on interface name. As example existing devices with cdc_ether
> interface could be mobile phone which provides connectivity to 3G network,
> or could be a phone in the mode "over PC", where phone applications
> access internet via broadband connection on PC (to save money).
> Network manager cannot simply make decision which devices can be used
> for mobile broadband access based on interface name. It needs an additional
> info, which does not exist in device descriptor.

Well, but cdc-ether usually means that you can start up dhcp and use the
interface as a network card. Can the same be done with cdc-ncm or do you always
need to establish a connection through a secondary interface?

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