• Ying Xue's avatar
    tipc: enhance priority of link protocol packet · 796c75d0
    Ying Xue authored
    pfifo_fast is set as default traffic class queueing discipline. This
    queue has three so called "bands". Within each band, FIFO rules apply.
    However, as long as there are packets waiting in band 0, band 1 won't
    be processed.
    Now all kind of TIPC type packet priorities are never set, that is,
    their priorities are 0, so they are mapped to band 1 of pfifo_fast
    qdisc. But, especially during link congestion, if link protocol packet
    can be sent out as earlier as possible than other type of packets so
    that protocol packet can arrive at peer endpoint in time, the peer
    will timely reset its link timeout timer to keep the link alive.
    So enhancing the priority of link protocol packets can meet the
    specific demand to avoid unnecessary link reset due to a transient
    link congestion.
    Signed-off-by: default avatarYing Xue <ying.xue@windriver.com>
    Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>