netdev - Re: [PATCH net-next] net: wwan: iosm: Enable M.2 7360 WWAN card support

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Date:   Thu, 10 Feb 2022 16:38:47 +0100
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     M Chetan Kumar <m.chetan.kumar@...ux.intel.com>,
        <netdev@...r.kernel.org>
CC:     <kuba@...nel.org>, <davem@...emloft.net>,
        <johannes@...solutions.net>, <ryazanov.s.a@...il.com>,
        <loic.poulain@...aro.org>, <krishna.c.sudi@...el.com>,
        <linuxwwan@...el.com>, <flokli@...kli.de>
Subject: Re: [PATCH net-next] net: wwan: iosm: Enable M.2 7360 WWAN card
 support

On 10.02.22 16:34, M Chetan Kumar wrote:
> This patch enables Intel M.2 7360 WWAN card support on
> IOSM Driver.
> 
> Control path implementation is a reuse whereas data path
> implementation it uses a different protocol called as MUX
> Aggregation. The major portion of this patch covers the MUX
> Aggregation protocol implementation used for IP traffic
> communication.
> 
> For M.2 7360 WWAN card, driver exposes 2 wwan AT ports for
> control communication.  The user space application or the
> modem manager to use wwan AT port for data path establishment.
> 
> During probe, driver reads the mux protocol device capability
> register to know the mux protocol version supported by device.
> Base on which the right mux protocol is initialized for data
> path communication.
> 
> An overview of an Aggregation Protocol
> 1>  An IP packet is encapsulated with 16 octet padding header
>     to form a Datagram & the start offset of the Datagram is
>     indexed into Datagram Header (DH).
> 2>  Multiple such Datagrams are composed & the start offset of
>     each DH is indexed into Datagram Table Header (DTH).
> 3>  The Datagram Table (DT) is IP session specific & table_length
>     item in DTH holds the number of composed datagram pertaining
>     to that particular IP session.
> 4>  And finally the offset of first DTH is indexed into DBH (Datagram
>     Block Header).
> 
> So in TX/RX flow Datagram Block (Datagram Block Header + Payload)is
> exchanged between driver & device.
> 
> Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>

Hey, cool! I'll be happy to try that out soon. Any special userland
changes required, or will it "just work" with sufficiently recent
ModemManager or whatever?

Thanks,
Jan

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