linux-kernel - Re: [PATCH v2 00/17] net: introduce Qualcomm IPA driver

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Date:   Wed, 19 Jun 2019 12:47:41 -0600
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Johannes Berg <johannes@...solutions.net>,
        Alex Elder <elder@...aro.org>, abhishek.esse@...il.com,
        Ben Chan <benchan@...gle.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        cpratapa@...eaurora.org, David Miller <davem@...emloft.net>,
        Dan Williams <dcbw@...hat.com>,
        DTML <devicetree@...r.kernel.org>,
        Eric Caruso <ejcaruso@...gle.com>, evgreen@...omium.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-soc@...r.kernel.org, Networking <netdev@...r.kernel.org>,
        syadagir@...eaurora.org
Subject: Re: [PATCH v2 00/17] net: introduce Qualcomm IPA driver

>> There is a n:1 relationship between rmnet and IPA.
>> rmnet does the de-muxing to multiple netdevs based on the mux id
>> in the MAP header for RX packets and vice versa.
> 
> Oh, so you mean that even though IPA supports multiple channels
> and multiple netdev instances for a physical device, all the
> rmnet devices end up being thrown into a single channel in IPA?
> 
> What are the other channels for in IPA? I understand that there
> is one channel for commands that is separate, while the others
> are for network devices, but that seems to make no sense if
> we only use a single channel for rmnet data.
> 

AFAIK, the other channels are for use cases like tethering.
There is only a single channel which is used for RX
data which is then de-muxed using rmnet.

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