[riot-notifications] [RIOT-OS/RIOT] gnrc_sixlowpan_frag: allow send of multiple datagrams simultaneously (#11021)

Martine Lenders notifications at github.com
Fri Feb 15 12:50:42 CET 2019


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### Contribution description
For fragment forwarding I need to be able to send (and in case the packet is compressed also [re-]construct) fragments of multiple datagrams. Currently this is not possible, since the source for the datagram tag is always taken from the global variable `_tag`. However, by adding the `tag` to the `gnrc_sixlowpan_msg_frag_t` type we are able to allocate a datagram tag from `_tag` at an earlier point and use the new member to set the fragments datagram tag field from that.

I also piggy-backed some optimizations to the `gnrc_sixlowpan_frag` module, which results in this enhancement only to require 20 more bytes of code.
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### Testing procedure
`gnrc_networking` should still be able to ping between two 6Lo-capable nodes with large payloads.
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### Issues/PRs references
None
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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11021

-- Commit Summary --

  * gnrc_sixlowpan_frag: expose tag progression functionality
  * gnrc_sixlowpan_frag: allow send of multiple datagrams simultaneously
  * gnrc_sixlowpan_frag: reorder stack variables for better stack usage
  * gnrc_sixlowpan_frag: unify common operations

-- File Changes --

    M sys/include/net/gnrc/sixlowpan/frag.h (8)
    M sys/net/gnrc/network_layer/sixlowpan/frag/gnrc_sixlowpan_frag.c (107)
    M sys/net/gnrc/network_layer/sixlowpan/gnrc_sixlowpan.c (1)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11021.patch
https://github.com/RIOT-OS/RIOT/pull/11021.diff

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