linux-kernel - Re: [PATCH] usb: gadget: f_rndis: fix usb_interface

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Date:	Wed, 24 Sep 2014 19:25:30 +0700
From:	Lars Melin <larsm17@...il.com>
To:	Heiko Schocher <hs@...x.de>, linux-usb@...r.kernel.org
CC:	Felipe Balbi <balbi@...com>, Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, Oliver Neukum <oliver@...kum.name>,
	netdev@...r.kernel.org, linux-api@...r.kernel.org,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Macpaul Lin <macpaul@...il.com>
Subject: Re: [PATCH] usb: gadget: f_rndis: fix usb_interface_descriptor for
 rndis

On 2014-09-24 13:48, Heiko Schocher wrote:
> use the values for RNDIS over Ethernet as defined in
> http://www.usb.org/developers/defined_class
> (search for RDNIS):
>
> - baseclass: 0xef (miscellaneous)
> - subclass: 0x04
> - protocol: 0x01
>
That is usb class, it is not the same thing as communication device class.
> --- a/include/uapi/linux/usb/cdc.h
> +++ b/include/uapi/linux/usb/cdc.h
> @@ -12,6 +12,7 @@
>   #include <linux/types.h>
>   
>   #define USB_CDC_SUBCLASS_ACM			0x02
> +#define USB_CDC_SUBCLASS_RNDIS			0x04
No, no, no.
There is no CDC_SUBCLASS_RNDIS and you can not define one over an 
already used cdc subclass number,  0x04 is  Multi-Channel Control Model

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