[riot-notifications] [RIOT-OS/RIOT] gnrc_sixlowpan_frag: move public rbuf functions to their own module (#12318)

Martine Lenders notifications at github.com
Fri Sep 27 18:43:53 CEST 2019


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### Contribution description
While implementing [selective fragment recovery](https://tools.ietf.org/html/draft-ietf-6lo-fragment-recovery-05) I ran into the problem of the reassembly buffer being bound to tight to classic reassembly, which makes it basically impossible to use without it. As a first preparation step to factor it out, I moved all its public functions to a new sub-module `gnrc_sixlowpan_frag_rb`. This should simplify the review greatly, as only move stuff around for now (which you can confirm if you activate [diff.colorMoved](https://git-scm.com/docs/git-config#Documentation/git-config.txt-diffcolorMoved) in your git-config.
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### Testing procedure
Verify that apart from some header changes and module definition stuff I only move stuff around (I'm assuming the RIOT-OS/RIOT remote is called `upstream` on your system)

```sh
git fetch upstream
git diff --color-moved $(git merge-base upstream/master HEAD)
```

`tests/gnrc_sixlowpan_frag` should still work:

```sh
BOARD="<pick one>" make -C tests/gnrc_sixlowpan_frag flash test
```

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### Issues/PRs references
None so far
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/12318

-- Commit Summary --

  * gnrc_sixlowpan_frag: move reassembly buffer to its own header
  * gnrc_sixlowpan_frag: move public rbuf functions to their own module
  * gnrc_sixlowpan: include reassembly buffer only where needed

-- File Changes --

    M Makefile.dep (1)
    M sys/Makefile.include (3)
    M sys/include/net/gnrc/sixlowpan/frag.h (106)
    A sys/include/net/gnrc/sixlowpan/frag/rb.h (140)
    M sys/include/net/gnrc/sixlowpan/frag/vrb.h (2)
    M sys/net/gnrc/Makefile (3)
    M sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c (57)
    A sys/net/gnrc/network_layer/sixlowpan/frag/rb/Makefile (3)
    A sys/net/gnrc/network_layer/sixlowpan/frag/rb/gnrc_sixlowpan_frag_rb.c (85)
    M sys/net/gnrc/network_layer/sixlowpan/frag/rbuf.h (2)
    M sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c (1)
    M sys/net/gnrc/network_layer/sixlowpan/iphc/gnrc_sixlowpan_iphc.c (2)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/12318.patch
https://github.com/RIOT-OS/RIOT/pull/12318.diff

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