Eric Lee / smarc-fsl-linux-kernel

29 Feb, 2016

2 commits

  • 0da003594   batman-adv: OGMv2 - add basic infrastructure ... Browse Code »

    This is the initial implementation of the new OGM protocol
    (version 2). It has been designed to work on top of the
    newly added ELP.

    In the previous version the OGM protocol was used to both
    measure link qualities and flood the network with the metric
    information. In this version the protocol is in charge of
    the latter task only, leaving the former to ELP.

    This means being able to decouple the interval used by the
    neighbor discovery from the OGM broadcasting, which revealed
    to be costly in dense networks and needed to be relaxed so
    leading to a less responsive routing protocol.

    Signed-off-by: Antonio Quartulli
    Signed-off-by: Marek Lindner

    Antonio Quartulli
     
  • d6f94d91f   batman-adv: ELP - adding basic infrastructure ... Browse Code »

    The B.A.T.M.A.N. protocol originally only used a single
    message type (called OGM) to determine the link qualities to
    the direct neighbors and spreading these link quality
    information through the whole mesh. This procedure is
    summarized on the BATMAN concept page and explained in
    details in the RFC draft published in 2008.

    This approach was chosen for its simplicity during the
    protocol design phase and the implementation. However, it
    also bears some drawbacks:

    * Wireless interfaces usually come with some packet loss,
    therefore a higher broadcast rate is desirable to allow
    a fast reaction on flaky connections.
    Other interfaces of the same host might be connected to
    Ethernet LANs / VPNs / etc which rarely exhibit packet
    loss would benefit from a lower broadcast rate to reduce
    overhead.
    * It generally is more desirable to detect local link
    quality changes at a faster rate than propagating all
    these changes through the entire mesh (the far end of
    the mesh does not need to care about local link quality
    changes that much). Other optimizations strategies, like
    reducing overhead, might be possible if OGMs weren't
    used for all tasks in the mesh at the same time.

    As a result detecting local link qualities shall be handled
    by an independent message type, ELP, whereas the OGM message
    type remains responsible for flooding the mesh with these
    link quality information and determining the overall path
    transmit qualities.

    Developed by Linus during a 6 months trainee study period in
    Ascom (Switzerland) AG.

    Signed-off-by: Linus Luessing
    Signed-off-by: Marek Lindner
    Signed-off-by: Antonio Quartulli

    Linus Luessing
     

02 Feb, 2016

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