Compare MC7430 based on qmi_wwan and GobiNet

[dailijin]

Hi Bjorn,


Thanks your detailed explanation.


As to qmi_wwan support dummy header,  is there patch about this now?


Thanks







--

Best Regards,
Dai,Lijin



At 2016-09-09 15:59:34, "Bjørn Mork" <bjorn at mork.no> wrote:
>dailijin <dailijin126 at 126.com> writes:
>
>> Hi All,
>>
>>
>> I just now test Sierra dev kit and driver, the MC7430 can work and get
>> IP via dhclient, Does this indicate the modem work on 802-3 protocol?
>
>No, but the GobiNet driver will add and strip the ethernet header, so it
>appears so to the host.  This is similar to what e.g. cdc_mbim does for
>MBIM functions.
>
>We had an informal vote for or against that model before implementing
>the qmi_wwan raw-ip support, and it was rejected. If anything, I regret
>having pushed for doing it in cdc_mbim.  And I definitely regret having
>chosen 802-3 as the default mode for qmi_wwan.  We would have been much
>better off with raw-ip from the beginning, and just rejected the
>ethernet illusion.  But time machines are currently too expensive for me
>;)
>
>
>> Before somebody told me the MC7430 only can work with raw-ip mode,
>
>Correct.
>
>> so need use udhcpc include dhclient to get IP,
>
>Correct for qmi_wwan, since it does not fake an ethernet interface in
>raw-ip mode.
>
>As you have found out, there are ways to make dhclient work too since
>the modem does run a DHCP server.  One method is making the driver add
>dummy headers.  Another method is making dhclient accept that there is
>no header
>
>> I want to test MC7430 modem work on 802-3 mode with qmi_wwan driver,
>> but always set data packet as 802-3 fail. Does anyone know how to do
>> this?
>
>Not supported by the MC7430.  Just ask Sierra Wireless.
>
>
>Bjørn
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