• Jon Paul Maloy's avatar
    tipc: simplify bearer level broadcast · b06b281e
    Jon Paul Maloy authored
    Until now, we have been keeping track of the exact set of broadcast
    destinations though the help structure tipc_node_map. This leads us to
    have to maintain a whole infrastructure for supporting this, including
    a pseudo-bearer and a number of functions to manipulate both the bearers
    and the node map correctly. Apart from the complexity, this approach is
    also limiting, as struct tipc_node_map only can support cluster local
    broadcast if we want to avoid it becoming excessively large. We want to
    eliminate this limitation, in order to enable introduction of scoped
    multicast in the future.
    
    A closer analysis reveals that it is unnecessary maintaining this "full
    set" overview; it is sufficient to keep a counter per bearer, indicating
    how many nodes can be reached via this bearer at the moment. The protocol
    is now robust enough to handle transitional discrepancies between the
    nominal number of reachable destinations, as expected by the broadcast
    protocol itself, and the number which is actually reachable at the
    moment. The initial broadcast synchronization, in conjunction with the
    retransmission mechanism, ensures that all packets will eventually be
    acknowledged by the correct set of destinations.
    
    This commit introduces these changes.
    Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
    Reviewed-by: default avatarYing Xue <ying.xue@windriver.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    b06b281e
bearer.h 8.24 KB