netdev - Re: [PATCH net-next v6 0/3] The huawei_cdc

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Date:	Thu, 13 Mar 2014 22:25:57 +0200
From:	Pasi Kärkkäinen <pasik@....fi>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Enrico Mioso <mrkiko.rs@...il.com>,
	Oliver Neukum <oliver@...kum.org>
Subject: Re: [PATCH net-next v6 0/3] The huawei_cdc_ncm driver / E3276
 problem

On Mon, Nov 04, 2013 at 09:50:46AM +0100, Bjørn Mork wrote:
> 
> [quote Enrico Mioso]
> 
> So this is a new, revised, edition of the huawei_cdc_ncm.c driver, which 
> supports devices resembling the NCM standard, but using it also as a mean 
> to encapsulate other protocols, as is the case for the Huawei E3131 and
> E3251 modem devices.
>

Hello,

I'm trying to use Huawei E3276 4G/LTE USB dongle with Linux 3.13.6 kernel,
and thus i'm using the new huawei_cdc_ncm driver.

I'm using the /dev/cdc-wdm0 device to send AT commands to it, and that seems to work,
so the dongle seems like it's connected (also the LED on the dongle suggests it's connected).

.. the problem is the wwan0 interface (well, udev renames it to wwp0s26u1u5i1) doesn't work.
Launching a dhcp client on the wwp0s26u1u5i1 doesn't get any IP address.

Any tips how to troubleshoot this? 

I'm seeing "RX errors" listed for the interface in "ifconfig -a" output.. is that normal? 

The device in question is (ATI command output):

Manufacturer: huawei
Model: E3276
Revision: 21.263.03.00.07
IMEI: 863XYZXYZXYZXYZ
+GCAP: +CGSM,+DS,+ES

Thanks!

-- Pasi


> Some precisations are needed however - and I encourage discussion on this: and 
> that's why I'm sending this message with a broader CC.
> Merging those patches might change:
> - the way Modem Manager interacts with those devices
> - some regressions might be possible if there are some unknown firmware 
>   variants around (Franko?)
> 
> First of all: I observed the behaviours of two devices.
> Huawei E3131: this device doesn't accept NDIS setup requests unless they're 
> sent via the embedded AT channel exposed by this driver.
> So actually we gain funcionality in this case!
> 
> The second case, is the Huawei E3251: which works with standard NCM driver, 
> still exposing an AT embedded channel. Whith this patch set applied, you gain 
> some funcionality, loosing the ability to catch standard NCM events for now.
> The device will work in both ways with no problems, but this has to be 
> acknowledged and discussed. Might be we can develop this driver further to 
> change this, when more devices are tested.
> 
> We where thinking Huawei changed their interfaces on new devices - but probably 
> this driver only works around a nice firmware bug present in E3131, which 
> prevented the modem from being used in NDIS mode.
> 
> I think committing this is definitely wortth-while, since it will allow for 
> more Huawei devices to be used without serial connection. Some devices like the 
> E3251 also, reports some status information only via the embedded AT channel, 
> at least in my case.
> Note: I'm not subscribed to any list except the Modem Manager's one, so please 
> CC me, thanks!!
> 
> [/quote]
> 
> Enrico Mioso (3):
>   net: cdc_ncm: Export cdc_ncm_{tx,rx}_fixup functions for re-use
>   net: huawei_cdc_ncm: Introduce the huawei_cdc_ncm driver
>   net: cdc_ncm: remove non-standard NCM device IDs
> 
>  drivers/net/usb/Kconfig          |   15 +++
>  drivers/net/usb/Makefile         |    1 +
>  drivers/net/usb/cdc_ncm.c        |   17 +--
>  drivers/net/usb/huawei_cdc_ncm.c |  230 ++++++++++++++++++++++++++++++++++++++
>  include/linux/usb/cdc_ncm.h      |    3 +
>  5 files changed, 253 insertions(+), 13 deletions(-)
>  create mode 100644 drivers/net/usb/huawei_cdc_ncm.c
> 
> -- 
> 1.7.10.4
> 
> --
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