netdev - Re: cellular modem driver APIs

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Date:   Fri, 12 Apr 2019 16:27:06 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Dan Williams <dcbw@...hat.com>, netdev@...r.kernel.org,
        Sean Tranchetti <stranche@...eaurora.org>,
        Daniele Palmas <dnlplm@...il.com>,
        Aleksander Morgado <aleksander@...ksander.es>,
        netdev-owner@...r.kernel.org
Subject: Re: cellular modem driver APIs

Johannes Berg <johannes@...solutions.net> writes:
> On Wed, 2019-04-10 at 21:54 -0600, Subash Abhinov Kasiviswanathan wrote:
>
>> These packets will be processed as raw IP muxed frames on the PC as 
>> well, not as ethernet though.
>
> But in order to transport them, they're always encapsulated in ethernet?

No. There is no ethernet encapsulation of QMAP muxed frames over USB.

Same goes for MBIM, BTW. The cdc_mbim driver adds ethernet encapsulation
on the host side, but that is just an unfortunate design decision based
on the flawed assumption that ethernet interfaces are easier to relate
to.


Bjørn