• Patrick McHardy's avatar
    [NET_SCHED]: act_api: qdisc internal reclassify support · 73ca4918
    Patrick McHardy authored
    The behaviour of NET_CLS_POLICE for TC_POLICE_RECLASSIFY was to return
    it to the qdisc, which could handle it internally or ignore it. With
    NET_CLS_ACT however, tc_classify starts over at the first classifier
    and never returns it to the qdisc. This makes it impossible to support
    qdisc-internal reclassification, which in turn makes it impossible to
    remove the old NET_CLS_POLICE code without breaking compatibility since
    we have two qdiscs (CBQ and ATM) that support this.
    
    This patch adds a tc_classify_compat function that handles
    reclassification the old way and changes CBQ and ATM to use it.
    
    This again is of course not fully backwards compatible with the previous
    NET_CLS_ACT behaviour. Unfortunately there is no way to fully maintain
    compatibility *and* support qdisc internal reclassification with
    NET_CLS_ACT, but this seems like the better choice over keeping the two
    incompatible options around forever.
    Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    73ca4918
sch_atm.c 20.1 KB