linux-kernel - Re: [PATCH v2 0/2] Add MHI Endpoint network driver

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Date:   Thu, 8 Jun 2023 18:10:57 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, mhi@...ts.linux.dev,
        linux-arm-msm@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, loic.poulain@...aro.org
Subject: Re: [PATCH v2 0/2] Add MHI Endpoint network driver

On Wed, Jun 07, 2023 at 08:13:32PM +0200, Andrew Lunn wrote:
> On Wed, Jun 07, 2023 at 09:49:22AM -0700, Jakub Kicinski wrote:
> > On Wed,  7 Jun 2023 20:54:25 +0530 Manivannan Sadhasivam wrote:
> > > This series adds a network driver for the Modem Host Interface (MHI) endpoint
> > > devices that provides network interfaces to the PCIe based Qualcomm endpoint
> > > devices supporting MHI bus (like Modems). This driver allows the MHI endpoint
> > > devices to establish IP communication with the host machines (x86, ARM64) over
> > > MHI bus.
> > > 
> > > On the host side, the existing mhi_net driver provides the network connectivity
> > > to the host.
> > 
> > Why are you posting the next version before the discussion on the
> > previous one concluded? :|
> > 
> > In any case, I'm opposed to reuse of the networking stack to talk
> > to firmware. It's a local device. The networking subsystem doesn't
> > have to cater to fake networks. Please carry:
> > 
> > Nacked-by: Jakub Kicinski <kuba@...nel.org>
> 
> Remote Processor Messaging (rpmsg) Framework does seem to be what is
> supposed to be used for these sorts of situations. Not that i know
> much about it.
> 

Rpmsg is another messaging protocol used for talking to the remote processor.
MHI is somewhat similar in terms of usecase but it is a proprietary protocol
used by Qcom for their devices.

- Mani

>      Andrew

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