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authorEric Dumazet <eric.dumazet@gmail.com>2011-12-09 02:46:45 +0000
committerDavid S. Miller <davem@davemloft.net>2011-12-09 13:46:15 -0500
commita73ed26bbae7327370c5bd298f07de78df9e3466 (patch)
tree3c7a04e638261cdd16c324ecd07e303e72fac3b9 /net/sched/sch_choke.c
parentRevert "net: netprio_cgroup: make net_prio_subsys static" (diff)
downloadlinux-dev-a73ed26bbae7327370c5bd298f07de78df9e3466.tar.xz
linux-dev-a73ed26bbae7327370c5bd298f07de78df9e3466.zip
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 <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_choke.c')
-rw-r--r--net/sched/sch_choke.c8
1 files changed, 7 insertions, 1 deletions
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: