[riot-devel] Plans for switching over to a new network infrastructure in GNRC

Martine Lenders mail at martine-lenders.eu
Tue Nov 28 15:30:15 CET 2017


Hi,

yep, there is still some major optimization work required. But the feature
set provided in #7925 is a little bit larger than the previous NDP
implementation was (namely: the UNREACHABLE state as proposed in RFC 7048
is now fully working) + many places that made the old implementation
smaller, were just plain wrong assumptions that were major quality defects
in the old implementation. What is weird though is, that the 6LN
configuration got so much bigger... I would have expected it to be way
smaller :-/. (Also MSP430 [not listed] is unexpectedly large, but I blame
that on the old GCC doing some bad optimization work).

Cheers,
Martine

2017-11-28 15:21 GMT+01:00 Koen Zandberg <koen at bergzand.net>:

> Hi,
>
> As #7925 was merged yesterday, there is now a nightly build with the
> gnrc_netif code merged. From this I present you the build size differences
> <https://riot-graphs.snt.utwente.nl/dashboard/db/full-grid-diff-boards-vertical?orgId=1&from=1511743027554&to=1511869511369&var-test=examples%2Fdefault&var-test=examples%2Fgcoap&var-test=examples%2Fgnrc_border_router&var-test=examples%2Fgnrc_minimal&var-test=examples%2Fgnrc_networking&var-test=tests%2Fgnrc_udp&var-board=arduino-mega2560&var-board=cc2538dk&var-board=native&var-board=nucleo-f401&var-board=pic32-wifire&var-board=samr21-xpro&var-result=text>
> between today (with gnrc_netif) and yesterday (before the merge). Absolute
> numbers on a single application on a single board can be found by pressing
> the relevant diff. Selection of the tests, boards and metric (bss, data and
> text) is at the top of the page.
>
> Some remarks: These are the diffs between the previous and the current
> build size, not absolute numbers. Furthermore, this is a comparison between
> nightlies, not from merge to merge, so all merges from yesterday are
> included in this diff.
>
> Cheers,
> Koen
>
> On 11/01/2017 04:26 PM, Martine Lenders wrote:
>
> Hi,
>
> FYI there is a re-integration PR now: https://github.com/RIOT-
> OS/RIOT/pull/7925
>
> Cheers,
> Martine
>
> 2017-10-27 17:56 GMT+02:00 Martine Lenders <m.lenders at fu-berlin.de>:
>
>> Hi all,
>>
>> after the release is before the release, so let's use the drive to
>> continue the good work.
>>
>> Some of you might have noticed, that we are currently working on a big
>> switch-over for GNRC-internal APIs, so if you are not involved in any
>> direct GNRC programming or need access to the network interfaces this won't
>> most likely only affect you a little bit (the calls how to get an interface
>> ID will change -- actually simplify ;-)) to not at all.
>>
>> This is quite a massive step, since basically most of the files that are
>> doing operations on, or related to network interfaces (i.e. IPv6, 6LoWPAN,
>> MAC and routing protocols) need to be touched. In addition we decided to
>> integrate this network interface layer directly with the new, shiny and
>> fixed neighbor discovery which saves us a lot of integration work into old
>> stuff, but doesn't make things easier. Some of that work is already done
>> and in master, but most of it will take some time to adapt.
>>
>> This is why we (the RIOT maintainers) decided to go a slightly different
>> route than usual: we made a feature branch where all the integration work
>> (and testing) for the new components will happen [1] and made a 1-2 week
>> plan to get this branch re-merged into master as fast as possible. In that
>> time this feature branch exist merging new changes to GNRC into master is
>> highly discouraged to not risk merge conflicts in the
>> gnrc_netif2_integration/master branch. We will notify you again when this
>> embargo is lifted.
>>
>> So what changes after all this is done (I call the new interface API
>> gnrc_netif2 here, but in the final result it will be called just
>> gnrc_netif):
>>
>> * Network interfaces:
>>     - Simplification of GNRC's network interface architecture: currently
>> there are 4 APIs (gnrc_netdev, gnrc_netif, gnrc_ipv6_netif, and
>> gnrc_sixlowpan_netif) that represent network interfaces in some kind or
>> form. This makes things complicated if you need e.g. in NDP information
>> that is both device dependent (e.g. link-layer address) and IPv6 dependent
>> (e.g. IPv6 address). This is why gnrc_netif2 merges all these APIs into one
>> single API.
>>     - Tighter integration into GNRC's principles: For most device related
>> options interfaces worked like any other GNRC module and used NETAPI, but
>> when it came to other stuff, like IPv6 addresses or 6LoWPAN configuration,
>> other APIs were used. With gnrc_netif2 all options can be set via NETAPI.
>>     - Better thread synchronization: apart from the the fact that
>> GNRC-externally the options are now set over NETOPT (i.e. in the thread
>> context of the interface) we also use recursive mutexes GNRC-internally now
>> to better synchronize the access to the interface. In the previous
>> implementation normal mutexes were used (requiring some dangerous unlocking
>> in the middle of an operation) or no mutexes were used at all.
>>     - Easier to extend: If you want to provide a new MAC protocol to GNRC
>> you don't have to copy all the thread-handler stuff anymore. Just implement
>> the operations provided in `gnrc_netif2_ops_t` and let gnrc_netif2 do the
>> rest ;-).
>> * new neighbor discovery:
>>     - In comparison to the old neighbor discovery the new was designed
>> more thoughtfully so it easier to maintain.
>>     - Most issues with the old neighbor discovery were fixed (because
>> with the new design we actually were able to pinpoint issues within
>> minutes, not within days as with the old NDP)
>>     - For the end-user the shell commands will change slightly:
>> manipulations of the neighbor cache and FIB now are done using the `nib`
>> command instead of a wide variety of commands.
>>
>> I hope that's all.
>>
>> If you have further questions, don't be afraid to ask.
>>
>> Cheers,
>> Martine
>>
>> [1] https://github.com/RIOT-OS/RIOT/tree/gnrc_netif2_integration/master
>>
>
>
>
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