linux-kernel - Re: [PATCH 0/3] Add MHI Endpoint network driver

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Date:   Wed, 7 Jun 2023 13:11:18 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     Andrew Lunn <andrew@...n.ch>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Add MHI Endpoint network driver

On Wed, Jun 07, 2023 at 09:12:00AM +0200, Loic Poulain wrote:
> On Wed, 7 Jun 2023 at 08:56, Manivannan Sadhasivam
> <manivannan.sadhasivam@...aro.org> wrote:
> >
> > On Tue, Jun 06, 2023 at 02:59:00PM +0200, Andrew Lunn wrote:
> > > On Tue, Jun 06, 2023 at 06:01:16PM +0530, Manivannan Sadhasivam wrote:
> > > > Hi,
> > > >
> > > > 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.
> > > >
> > > > - Mani
> > > >
> > > > Manivannan Sadhasivam (3):
> > > >   net: Add MHI Endpoint network driver
> > > >   MAINTAINERS: Add entry for MHI networking drivers under MHI bus
> > > >   net: mhi: Increase the default MTU from 16K to 32K
> > > >
> > > >  MAINTAINERS              |   1 +
> > > >  drivers/net/Kconfig      |   9 ++
> > > >  drivers/net/Makefile     |   1 +
> > > >  drivers/net/mhi_ep_net.c | 331 +++++++++++++++++++++++++++++++++++++++
> > > >  drivers/net/mhi_net.c    |   2 +-
> > >
> > > Should we add a drivers/net/modem directory? Maybe modem is too
> > > generic, we want something which represents GSM, LTE, UMTS, 3G, 4G,
> > > 5G, ... XG etc.
> > >
> >
> > The generic modem hierarchy sounds good to me because most of the times a
> > single driver handles multiple technologies. The existing drivers supporting
> > modems are already under different hierarchy like usb, wwan etc... So unifying
> > them makes sense. But someone from networking community should take a call.
> 
> 
> Yes, so there is already a drivers/net/wwan directory for this, in
> which there are drivers for control and data path, that together
> represent a given 'wwan' (modem) entity. So the generic mhi_net could
> be moved there, but the point is AFAIU, that MHI, despite his name, is
> not (more) used only for modem, but as a generic memory sharing based
> transport protocol, such as virtio. It would then not be necessarily
> true that a peripheral exposing MHI net channel is actually a modem?
> 

Agree, mhi_*_net drivers can be used by non-modem devices too as long as they
support MHI protocol.

- Mani

> Regards,
> Loic

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