netdev - Re: [PATCH] ieee802154: add rx LQI from userspace

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Date:   Fri, 13 Jul 2018 11:43:49 -0400
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Clément Péron <peron.clem@...il.com>
Cc:     Romuald Cari <romuald.cari@...ialet.com>,
        linux-wpan@...r.kernel.org, Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@....samsung.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Clément Peron <clement.peron@...ialet.com>
Subject: Re: [PATCH] ieee802154: add rx LQI from userspace

Hello.

On 10.07.2018 11:13, Clément Péron wrote:
> Hi Alexander, Stefan,
> 
> Thanks for your feedbacks,
> 
> On Mon, 9 Jul 2018 at 10:49, Stefan Schmidt <stefan@...enfreihafen.org> wrote:
>>
>> Hello Clement.
>>
>> Finally coming to review the patch. Sorry for the delay.
>>
>> On 07.06.2018 16:08, Clément Péron wrote:
>>> From: Romuald CARI <romuald.cari@...ialet.com>
>>>
>>> The Link Quality Indication data exposed by drivers could not be accessed from
>>> userspace. Since this data is per-datagram received, it makes sense to make it
>>> available to userspace application through the ancillary data mechanism in
>>> recvmsg rather than through ioctls. This can be activated using the socket
>>> option WPAN_WANTLQI under SOL_IEEE802154 protocol.
>>
>> I can see that it makes the application life a lot easier to have data
>> send out and LQI value synced up by using the socket approach instead of
>> dealing with socket and ioctl's. I am good with this patch in general.
>>
>> So you have some public code that uses this approach? I would be
>> interesting in the userspace part of yours. A demo would be fine. If the
>> network handling part of your application is public anyway that would be
>> even better. :-)
> 
> I'm sorry but the userspace code that use this isn't open.

Fair enough.

> I will check if I can share this part.
> Just the idea is to compute an average LQI and when it reach a
> threshold we allow the remote to control the device.

Yes, I would be happy with a simple example just showing how to use the
socket opt and a very basic algo on how this LQI would be used.

regards
Stefan Schmidt