linux-kernel - Re: [RFC 1/3 net] lorawan: Add LoRaWAN class module

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Date:   Sun, 23 Sep 2018 18:40:25 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     Jian-Hong Pan <starnight@...cu.edu.tw>
Cc:     netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>,
        Marcel Holtmann <marcel@...tmann.org>,
        "David S. Miller" <davem@...emloft.net>,
        Matthias Brugger <mbrugger@...e.com>,
        Janus Piwek <jpiwek@...oweurope.com>,
        Michael Röder <michael.roeder@...et.eu>,
        Dollar Chen <dollar.chen@...ec.com>,
        Ken Yu <ken.yu@...wireless.com>,
        Konstantin Böhm <konstantin.boehm@...ud.de>,
        Jan Jongboom <jan.jongboom@....com>,
        Jon Ortego <Jon.Ortego@...t.de>,
        "contact@...otlab.com" <contact@...otlab.com>,
        Ben Whitten <ben.whitten@...rdtech.com>,
        Brian Ray <brian.ray@...k-labs.com>, lora@...balsat.com.tw,
        Alexander Graf <agraf@...e.de>,
        Michal Kubeček <mkubecek@...e.cz>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        Steve deRosier <derosier@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
        Pieter ROBYNS <pieter.robyns@...sselt.be>,
        Hasnain Virk <Hasnain.Virk@....com>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Daniele Comel <dcomel@...ot.com>, shess@...sware.de,
        Xue Liu <liuxuenetmail@...il.com>, fomi <fomi@...wireless.com>,
        Afonso Bordado <afonsobordado@....co>
Subject: Re: [RFC 1/3 net] lorawan: Add LoRaWAN class module

Hi Jian-Hong,

[+ Afonso]

Am 23.08.18 um 19:15 schrieb Jian-Hong Pan:
> LoRaWAN defined by LoRa Alliance(TM) is the MAC layer over LoRa devices.
> 
> This patch implements part of Class A end-devices features defined in
> LoRaWAN(TM) Specification Ver. 1.0.2:
> 1. End-device receive slot timing
> 2. Only single channel and single data rate for now
> 3. Unconfirmed data up/down message types
> 4. Encryption/decryption for up/down link data messages
> 
> It also implements the the functions and maps to Datagram socket for
> LoRaWAN unconfirmed data messages.
> 
> On the other side, it defines the basic interface and operation
> functions for compatible LoRa device drivers.
> 
> Signed-off-by: Jian-Hong Pan <starnight@...cu.edu.tw>
> ---
>  include/linux/maclorawan/lora.h | 239 +++++++++++
>  net/maclorawan/Kconfig          |  14 +
>  net/maclorawan/Makefile         |   2 +
>  net/maclorawan/lorawan.h        | 219 ++++++++++
>  net/maclorawan/lrwsec.c         | 237 +++++++++++
>  net/maclorawan/lrwsec.h         |  57 +++
>  net/maclorawan/mac.c            | 552 +++++++++++++++++++++++++
>  net/maclorawan/main.c           | 665 ++++++++++++++++++++++++++++++
>  net/maclorawan/socket.c         | 700 ++++++++++++++++++++++++++++++++
>  9 files changed, 2685 insertions(+)
>  create mode 100644 include/linux/maclorawan/lora.h

Can we use include/linux/lora/lorawan.h for simplicity?

>  create mode 100644 net/maclorawan/Kconfig
>  create mode 100644 net/maclorawan/Makefile
>  create mode 100644 net/maclorawan/lorawan.h
>  create mode 100644 net/maclorawan/lrwsec.c
>  create mode 100644 net/maclorawan/lrwsec.h
>  create mode 100644 net/maclorawan/mac.c
>  create mode 100644 net/maclorawan/main.c
>  create mode 100644 net/maclorawan/socket.c

This patch is much too large for me to review...

It also doesn't seem to follow the structure I suggested: 802.15.4 has
two separate directories, net/ieee802154/ and net/mac802154/. Therefore
I had suggested net/maclorawan/ only for code that translates from
ETH_P_LORAWAN to ETH_P_LORA socket buffers, i.e. your soft MAC. Generic
socket code that applies also to hard MAC drivers I expected to go
either to net/lora/lorawan/ or better net/lorawan/ or some other clearly
separate location, with its own Kconfig symbol - any reason not to?
Consider which parts can be enabled/used independently of each other,
then you can put them into two (or more?) different patches.

Also please use SPDX license identifiers in your headers.
And please don't put the whole world in To, use CC.

Thanks,
Andreas

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