From a73ed26bbae7327370c5bd298f07de78df9e3466 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 9 Dec 2011 02:46:45 +0000 Subject: sch_red: generalize accurate MAX_P support to RED/GRED/CHOKE 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: Eric Dumazet Signed-off-by: David S. Miller --- net/sched/sch_choke.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) (limited to 'net/sched/sch_choke.c') diff --git a/net/sched/sch_choke.c b/net/sched/sch_choke.c index 205d369a217c..bef00acb8bd2 100644 --- a/net/sched/sch_choke.c +++ b/net/sched/sch_choke.c @@ -394,6 +394,7 @@ static void choke_reset(struct Qdisc *sch) static const struct nla_policy choke_policy[TCA_CHOKE_MAX + 1] = { [TCA_CHOKE_PARMS] = { .len = sizeof(struct tc_red_qopt) }, [TCA_CHOKE_STAB] = { .len = RED_STAB_SIZE }, + [TCA_CHOKE_MAX_P] = { .type = NLA_U32 }, }; @@ -415,6 +416,7 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt) int err; struct sk_buff **old = NULL; unsigned int mask; + u32 max_P; if (opt == NULL) return -EINVAL; @@ -427,6 +429,8 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt) tb[TCA_CHOKE_STAB] == NULL) return -EINVAL; + max_P = tb[TCA_CHOKE_MAX_P] ? nla_get_u32(tb[TCA_CHOKE_MAX_P]) : 0; + ctl = nla_data(tb[TCA_CHOKE_PARMS]); if (ctl->limit > CHOKE_MAX_QUEUE) @@ -476,7 +480,8 @@ static int choke_change(struct Qdisc *sch, struct nlattr *opt) red_set_parms(&q->parms, ctl->qth_min, ctl->qth_max, ctl->Wlog, ctl->Plog, ctl->Scell_log, - nla_data(tb[TCA_CHOKE_STAB])); + nla_data(tb[TCA_CHOKE_STAB]), + max_P); if (q->head == q->tail) red_end_of_idle_period(&q->parms); @@ -510,6 +515,7 @@ static int choke_dump(struct Qdisc *sch, struct sk_buff *skb) goto nla_put_failure; NLA_PUT(skb, TCA_CHOKE_PARMS, sizeof(opt), &opt); + NLA_PUT_U32(skb, TCA_CHOKE_MAX_P, q->parms.max_P); return nla_nest_end(skb, opts); nla_put_failure: -- cgit v1.2.3