netdev - Re: [PATCH net-next v7 00/14] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem

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Date:   Fri, 6 May 2022 09:45:46 -0700
From:   "Martinez, Ricardo" <ricardo.martinez@...ux.intel.com>
To:     Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Johannes Berg <johannes@...solutions.net>,
        Loic Poulain <loic.poulain@...aro.org>,
        M Chetan Kumar <m.chetan.kumar@...el.com>,
        "Devegowda, Chandrashekar" <chandrashekar.devegowda@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        chiranjeevi.rapolu@...ux.intel.com,
        Haijun Liu (刘海军) 
        <haijun.liu@...iatek.com>,
        "Hanania, Amir" <amir.hanania@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Sharma, Dinesh" <dinesh.sharma@...el.com>,
        "Lee, Eliot" <eliot.lee@...el.com>,
        "Jarvinen, Ilpo Johannes" <ilpo.johannes.jarvinen@...el.com>,
        "Veleta, Moises" <moises.veleta@...el.com>,
        "Bossart, Pierre-louis" <pierre-louis.bossart@...el.com>,
        "Sethuraman, Muralidharan" <muralidharan.sethuraman@...el.com>,
        "Mishra, Soumya Prakash" <Soumya.Prakash.Mishra@...el.com>,
        "Kancharla, Sreehari" <sreehari.kancharla@...el.com>,
        "Sahu, Madhusmita" <madhusmita.sahu@...el.com>
Subject: Re: [PATCH net-next v7 00/14] net: wwan: t7xx: PCIe driver for
 MediaTek M.2 modem


On 5/6/2022 6:43 AM, Sergey Ryazanov wrote:
> Hello Ricardo,
>
> On Fri, May 6, 2022 at 4:16 AM Ricardo Martinez
> <ricardo.martinez@...ux.intel.com> wrote:
>> t7xx is the PCIe host device driver for Intel 5G 5000 M.2 solution which
>> is based on MediaTek's T700 modem to provide WWAN connectivity.
>> The driver uses the WWAN framework infrastructure to create the following
>> control ports and network interfaces:
>> * /dev/wwan0mbim0 - Interface conforming to the MBIM protocol.
>>    Applications like libmbim [1] or Modem Manager [2] from v1.16 onwards
>>    with [3][4] can use it to enable data communication towards WWAN.
>> * /dev/wwan0at0 - Interface that supports AT commands.
>> * wwan0 - Primary network interface for IP traffic.
>>
>> The main blocks in t7xx driver are:
>> * PCIe layer - Implements probe, removal, and power management callbacks.
>> * Port-proxy - Provides a common interface to interact with different types
>>    of ports such as WWAN ports.
>> * Modem control & status monitor - Implements the entry point for modem
>>    initialization, reset and exit, as well as exception handling.
>> * CLDMA (Control Layer DMA) - Manages the HW used by the port layer to send
>>    control messages to the modem using MediaTek's CCCI (Cross-Core
>>    Communication Interface) protocol.
>> * DPMAIF (Data Plane Modem AP Interface) - Controls the HW that provides
>>    uplink and downlink queues for the data path. The data exchange takes
>>    place using circular buffers to share data buffer addresses and metadata
>>    to describe the packets.
>> * MHCCIF (Modem Host Cross-Core Interface) - Provides interrupt channels
>>    for bidirectional event notification such as handshake, exception, PM and
>>    port enumeration.
>>
>> The compilation of the t7xx driver is enabled by the CONFIG_MTK_T7XX config
>> option which depends on CONFIG_WWAN.
>> This driver was originally developed by MediaTek. Intel adapted t7xx to
>> the WWAN framework, optimized and refactored the driver source code in close
>> collaboration with MediaTek. This will enable getting the t7xx driver on the
>> Approved Vendor List for interested OEM's and ODM's productization plans
>> with Intel 5G 5000 M.2 solution.
>>
>> List of contributors:
>> Amir Hanania <amir.hanania@...el.com>
>> Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> Chandrashekar Devegowda <chandrashekar.devegowda@...el.com>
>> Dinesh Sharma <dinesh.sharma@...el.com>
>> Eliot Lee <eliot.lee@...el.com>
>> Haijun Liu <haijun.liu@...iatek.com>
>> M Chetan Kumar <m.chetan.kumar@...el.com>
>> Mika Westerberg <mika.westerberg@...ux.intel.com>
>> Moises Veleta <moises.veleta@...el.com>
>> Pierre-louis Bossart <pierre-louis.bossart@...el.com>
>> Chiranjeevi Rapolu <chiranjeevi.rapolu@...el.com>
>> Ricardo Martinez <ricardo.martinez@...ux.intel.com>
>> Madhusmita Sahu <madhusmita.sahu@...el.com>
>> Muralidharan Sethuraman <muralidharan.sethuraman@...el.com>
>> Soumya Prakash Mishra <Soumya.Prakash.Mishra@...el.com>
>> Sreehari Kancharla <sreehari.kancharla@...el.com>
>> Suresh Nagaraj <suresh.nagaraj@...el.com>
>>
>> [1] https://www.freedesktop.org/software/libmbim/
>> [2] https://www.freedesktop.org/software/ModemManager/
>> [3] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/582
>> [4] https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/523
> Now the driver looks really nice. Good job!

Thanks Sergey.