netdev - Re: [PATCH net-next 3/3] net: mhi: Add mbim proto

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Message-ID: <20210129182108.771dc2fe@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 29 Jan 2021 18:21:08 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, carl.yin@...ctel.com,
        Dan Williams <dcbw@...hat.com>,
        Bjørn Mork <bjorn@...k.no>
Subject: Re: [PATCH net-next 3/3] net: mhi: Add mbim proto

On Wed, 27 Jan 2021 18:01:17 +0100 Loic Poulain wrote:
> MBIM has initially been specified by USB-IF for transporting data (IP)
> between a modem and a host over USB. However some modern modems also
> support MBIM over PCIe (via MHI). In the same way as QMAP(rmnet), it
> allows to aggregate IP packets and to perform context multiplexing.
> 
> This change adds minimal MBIM support to MHI, allowing to support MBIM
> only modems. MBIM being based on USB NCM, it reuses some helpers from
> the USB stack, but the cdc-mbim driver is too USB coupled to be reused.
> 
> At some point it would be interesting to move on a factorized solution,
> having a generic MBIM network lib or dedicated MBIM netlink virtual
> interface support.
> 
> This code has been highly inspired from the mhi_mbim downstream driver
> (Carl Yin <carl.yin@...ctel.com>).
> 
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>

Does the existing MBIM over USB NCM also show up as a netdev?

Let's CC Dan and Bjorn on MBIM-related code, they may have opinions.