• Eric Dumazet's avatar
    sch_red: generalize accurate MAX_P support to RED/GRED/CHOKE · a73ed26b
    Eric Dumazet authored
    Now RED uses a Q0.32 number to store max_p (max probability), allow
    RED/GRED/CHOKE to use/report full resolution at config/dump time.
    
    Old tc binaries are non aware of new attributes, and still set/get Plog.
    
    New tc binary set/get both Plog and max_p for backward compatibility,
    they display "probability value" if they get max_p from new kernels.
    
    # tc -d  qdisc show dev ...
    ...
    qdisc red 10: parent 1:1 limit 360Kb min 30Kb max 90Kb ecn ewma 5
    probability 0.09 Scell_log 15
    
    Make sure we avoid potential divides by 0 in reciprocal_value(), if
    (max_th - min_th) is big.
    Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    a73ed26b
sch_red.c 8.62 KB