• Jon Maloy's avatar
    tipc: improve groupcast scope handling · 232d07b7
    Jon Maloy authored
    When a member joins a group, it also indicates a binding scope. This
    makes it possible to create both node local groups, invisible to other
    nodes, as well as cluster global groups, visible everywhere.
    
    In order to avoid that different members end up having permanently
    differing views of group size and memberhip, we must inhibit locally
    and globally bound members from joining the same group.
    
    We do this by using the binding scope as an additional separator between
    groups. I.e., a member must ignore all membership events from sockets
    using a different scope than itself, and all lookups for message
    destinations must require an exact match between the message's lookup
    scope and the potential target's binding scope.
    
    Apart from making it possible to create local groups using the same
    identity on different nodes, a side effect of this is that it now also
    becomes possible to create a cluster global group with the same identity
    across the same nodes, without interfering with the local groups.
    Acked-by: default avatarYing Xue <ying.xue@windriver.com>
    Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    232d07b7
subscr.h 3.42 KB