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net: sched: htb: fix the calculation of quantum 

Now, 32bit rates may be not the true rate.
So use rate_bytes_ps which is from
max(rate32, rate64) to calcualte quantum.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yang Yingliang 2013-12-10 14:59:28 +08:00 committed by David S. Miller
parent cc106e441a
commit 1598f7cb47
1 changed files with 12 additions and 8 deletions
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20
net/sched/sch_htb.c
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@ -1477,11 +1477,22 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
sch_tree_lock(sch);
}
rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0;
ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0;
psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64);
psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64);
/* it used to be a nasty bug here, we have to check that node
* is really leaf before changing cl->un.leaf !
*/
if (!cl->level) {
cl->quantum = hopt->rate.rate / q->rate2quantum;
u64 quantum = cl->rate.rate_bytes_ps;
do_div(quantum, q->rate2quantum);
cl->quantum = min_t(u64, quantum, INT_MAX);
if (!hopt->quantum && cl->quantum < 1000) {
pr_warning(
"HTB: quantum of class %X is small. Consider r2q change.\n",
@ -1500,13 +1511,6 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
cl->prio = TC_HTB_NUMPRIO - 1;
}
rate64 = tb[TCA_HTB_RATE64] ? nla_get_u64(tb[TCA_HTB_RATE64]) : 0;
ceil64 = tb[TCA_HTB_CEIL64] ? nla_get_u64(tb[TCA_HTB_CEIL64]) : 0;
psched_ratecfg_precompute(&cl->rate, &hopt->rate, rate64);
psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, ceil64);
cl->buffer = PSCHED_TICKS2NS(hopt->buffer);
cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer);