netdev - Re: Qualcomm rmnet driver and qmi

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Message-ID: <9786ab4bf4e425566f55a0654911ab788f3f1a38.camel@redhat.com>
Date:   Tue, 05 Jun 2018 09:54:42 -0500
From:   Dan Williams <dcbw@...hat.com>
To:     Daniele Palmas <dnlplm@...il.com>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Cc:     netdev@...r.kernel.org
Subject: Re: Qualcomm rmnet driver and qmi_wwan

On Tue, 2018-06-05 at 11:38 +0200, Daniele Palmas wrote:
> Hi,
> 
> 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.
> > 
> 
> in kernel documentation I read that rmnet user space configuration is
> done through librmnetctl available at
> 
> https://source.codeaurora.org/quic/la/platform/vendor/qcom-opensource
> /dataservices/tree/rmnetctl
> 
> However it seems to me that this is a bit outdated (e.g. it does not
> properly build since it is looking for kernel header
> linux/rmnet_data.h that, as far as I understand, is no more present).
> 
> Is there available a more recent version of the tool?

I'd expect that somebody (Subash?) would add support for the
rmnet/qmimux options to iproute2 via 'ip link' like exists for most
other device types.

Dan

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