netdev - Re: [PATCH net-next 00/14] Adding a USB CDC MBIM driver

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Message-ID: <20121018211637.GA31828@kroah.com>
Date:	Thu, 18 Oct 2012 14:16:37 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Oliver Neukum <oliver@...kum.org>,
	Alexey Orishko <alexey.orishko@...il.com>,
	Greg Suarez <gpsuarez2512@...il.com>,
	"Fangxiaozhi (Franko)" <fangxiaozhi@...wei.com>,
	Dan Williams <dcbw@...hat.com>,
	Aleksander Morgado <aleksander@...edo.com>
Subject: Re: [PATCH net-next 00/14] Adding a USB CDC MBIM driver

On Thu, Oct 18, 2012 at 10:40:53PM +0200, Bjørn Mork wrote:
> The USB Communications Device Class "Mobile Broadband Interface Model"
> (MBIM) is the USB-IFs alternative to the current chipset/vendor
> specific solutions to "Mobile Broadband" device management. The
> specification, including the management protocol description, can be
> downloaded from http://www.usb.org/developers/devclass_docs#approved
> 
> This driver implementing most MBIM features with the exception of
> 32bit NTB and NDP headers.
> 
> An important design principle has been reusing as much as possible of
> existing kernel code, in particular the cdc_ncm and cdc_wdm drivers.
> The CDC MBIM protocol is based on CDC NCM, and much of the setup and
> framing logic is very similar.
> 
> One important addition in MBIM compared to NCM is the new control
> protocol embedded in CDC commands.  This protocol is comprehensive and
> support a number of policy decisions necessary for modern mobile
> broadband devices often having multiple radio interfaces.  Based on
> early comments and the experiences with the qmi_wwan driver, knowledge
> of the control protocol has been kept completely out of the driver.
> This is userspace material.  Like with qmi_wwan, a control protocol
> interface is exported to userspace using the cdc_wdm subdriver API,
> associating a /dev/cdc-wdmX character device with the network device
> for the management application.
> 
> Patch 1 and 2 are independent of the rest and only required to make
> test devices with very large buffers work.
> 
> Patch 3 adds new MBIM definitions to the cdc.h header file
> 
> Patches 4 to 9 refactor the cdc_ncm driver to enable reusing common
> parts for MBIM.
> 
> Patches 10 and 11 add the new cdc_mbim driver
> 
> Patch 12 prevents cdc_ncm from binding to backward compatible MBIM
> devices
> 
> Patches 13 and 14 extend the MBIM driver to support multiplexed
> sessions
> 
> The changes to the cdc_ncm driver has been tested and verified to work
> with an Ericsson F5521gw device.  The new cdc_mbim driver has been
> tested with a Huawei E367u-2 device with MBIM firmware, and other
> currently undisclosed devices.

Very nice work, I don't have any objections to any of this, but I just
did a very high-level code review:

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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