netdev - Re: Qualcomm rmnet driver and qmi

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Date:   Thu, 22 Feb 2018 11:44:25 +0100
From:   Daniele Palmas <dnlplm@...il.com>
To:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Cc:     netdev@...r.kernel.org
Subject: Re: Qualcomm rmnet driver and qmi_wwan

Hi Subash,

2018-02-21 20:47 GMT+01:00 Subash Abhinov Kasiviswanathan
<subashab@...eaurora.org>:
> On 2018-02-21 04:38, Daniele Palmas wrote:
>>
>> Hello,
>>
>> in rmnet kernel documentation I read:
>>
>> "This driver can be used to register onto any physical network device in
>> IP mode. Physical transports include USB, HSIC, PCIe and IP accelerator."
>>
>> Does this mean that it can be used in association with the qmi_wwan
>> driver?
>>
>> If yes, can someone give me an hint on the steps to follow?
>>
>> If not, does anyone know if it is possible to modify qmi_wwan in order
>> to take advantage of the features provided by the rmnet driver?
>>
>> In this case hint on the changes for modifying qmi_wwan are welcome.
>>
>> Thanks in advance,
>> Daniele
>
>
> Hi
>
> I havent used qmi_wwan so the following comment is based on code inspection.
> qmimux_register_device() is creating qmimux devices with usb net device as
> real_dev. The Multiplexing and aggregation header (qmimux_hdr) is stripped
> off
> in qmimux_rx_fixup() and the packet is passed on to stack.
>
> You could instead create rmnet devices with the usb netdevice as real dev.
> The packets from the usb net driver can be queued to network stack directly
> as rmnet driver will setup a RX handler. rmnet driver will process the
> packets
> further and then queue to network stack.
>

Thanks, I will try to do some testing and report my findings.

Regards,
Daniele

> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project