On Thu, 2014-03-13 at 22:25 +0200, Pasi Kärkkäinen wrote:
> 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?
Which AT commands are you using to start the data connection?
I believe Huawei says that DHCP on the network port is only supported if
network port's USB interface has Class 0x2 + SubClass [0x6 | 0xd] +
Protocol 0x0.
Lastly, I think the E3276 has a couple of different "modes" that it can
switch into with usb_modeswitch too, and only some modes expose the
right network interface. What modeswitch command is getting sent to the
device?
Dan
> 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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