netdev - Re: Is this 32-bit NCM?y

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Message-ID: <AMSPR06MB6011E001029C251790CB923EE780@AMSPR06MB601.eurprd06.prod.outlook.com>
Date:	Thu, 4 Dec 2014 10:10:16 +0000
From:	"Midge Shaojun  Tan" <ShaojunMidge.Tan@...iocodes.com>
To:	Enrico Mioso <mrkiko.rs@...il.com>,
	Bjørn Mork <bjorn@...k.no>
CC:	Kevin Zhu <Mingying.Zhu@...iocodes.com>,
	Eli Britstein <Eli.Britstein@...iocodes.com>,
	Alex Strizhevsky <alexxst@...il.com>,
	"youtux@...il.com" <youtux@...il.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Is this 32-bit NCM?y

Hi all,

I test OK with kervel 3.16.4
Need disable other Ethernet network, just like eth1. (Then the DNS and route is OK)
And also need disable arp, (ifconfig wwan0 -arp up), because China UNICOM don't respond the ARP message.
With new mode switch string: /etc/usb_modeswitch.d/12d1:14fe
Please see the patch and check whether it is correct?


-----邮件原件-----
发件人: Enrico Mioso [mailto:mrkiko.rs@...il.com]
发送时间: 2014年12月4日 17:54
收件人: Bjørn Mork
抄送: Kevin Zhu; Eli Britstein; Alex Strizhevsky; Midge Shaojun Tan; youtux@...il.com; linux-usb@...r.kernel.org; netdev@...r.kernel.org
主题: Re: Is this 32-bit NCM?y

Guys!
Don't forget I can test it - since I have a remote machine with 3.16 kernel and the device, at least for now.
So - Bjorn: do I need just to disable padding or do I need also to perform some other changes? I am sorry if I ask this a little bit stupidly, but I was alittle bit busy here.





On Thu, 4 Dec 2014, Bjørn Mork wrote:

> Date: Thu, 4 Dec 2014 10:19:11
> From: Bjørn Mork <bjorn@...k.no>
> To: Kevin Zhu <Mingying.Zhu@...iocodes.com>
> Cc: Enrico Mioso <mrkiko.rs@...il.com>,
>     Eli Britstein <Eli.Britstein@...iocodes.com>,
>     Alex Strizhevsky <alexxst@...il.com>,
>     Midge Shaojun Tan <ShaojunMidge.Tan@...iocodes.com>,
>     "youtux@...il.com" <youtux@...il.com>,
>     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
>     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
> Subject: Re: Is this 32-bit NCM?y
>
> Kevin Zhu <Mingying.Zhu@...iocodes.com> writes:
>
>> Guys,
>>
>> After rearranging the padding, putting NCM0 right after NTH, and
>> disable ARP (FLAG_NOARP) and handling the offset alignment issue, it
>> seems it begins to work, though there's still problem with DHCP.
>
> Great!  But it would be good to know if _one_ of these changes is
> enough to make it work.
>
>> The DHCP packet's size becomes a large one after the TX function,
>> which is 16384, the maximum.
>
> You can now (from v3.16) disable the padding by setting min_tx_pkt >= tx_max.
> Something like this should do for a simple test:
>
> echo 16384 >/sys/class/net/wwan0/cdc_ncm/min_tx_pkt
>
>
> Bjørn
>
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