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

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Message-ID: <20190531232746.GA25597@minitux>
Date:   Fri, 31 May 2019 16:27:46 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Alex Elder <elder@...aro.org>, Dan Williams <dcbw@...hat.com>,
        David Miller <davem@...emloft.net>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        evgreen@...omium.org, Ben Chan <benchan@...gle.com>,
        Eric Caruso <ejcaruso@...gle.com>, cpratapa@...eaurora.org,
        syadagir@...eaurora.org,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        abhishek.esse@...il.com, Networking <netdev@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-soc@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 00/17] net: introduce Qualcomm IPA driver

On Fri 31 May 12:19 PDT 2019, Arnd Bergmann wrote:

> On Fri, May 31, 2019 at 6:36 PM Alex Elder <elder@...aro.org> wrote:
> > On 5/31/19 9:58 AM, Dan Williams wrote:
> > > On Thu, 2019-05-30 at 22:53 -0500, Alex Elder wrote:
[..]
> > So basically, the purpose of the rmnet driver is to handle QMAP
> > protocol connections, and right now that's what the modem provides.
> 
> Do you have any idea why this particular design was picked?
> 

>From what I've seen of QMAP it seems like a reasonable design choice to
have a software component (rmnet) dealing with this, separate from the
transport. And I think IPA is the 4th or 5th mechanism for transporting
QMAP packets back and forth to the modem.


Downstream rmnet is copyright 2007-, and I know of interest in bringing
at least one of the other transports upstream.

Regards,
Bjorn