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tc: policing requires a rate estimator 

Found that while trying average rate policing, it was possible to
request average rate policing without a rate estimator. This results
in no policing which is harmless but incorrect.

Since policing could be setup in two steps, need to check
in the kernel.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2008-11-25 21:14:06 -08:00 committed by David S. Miller
parent 71bcb09a57
commit c1b56878fb
3 changed files with 35 additions and 4 deletions
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1
include/net/gen_stats.h
View File

@ -45,5 +45,6 @@ extern void gen_kill_estimator(struct gnet_stats_basic *bstats,
extern int gen_replace_estimator(struct gnet_stats_basic *bstats,
struct gnet_stats_rate_est *rate_est,
spinlock_t *stats_lock, struct nlattr *opt);
extern int gen_estimator_active(const struct gnet_stats_rate_est *rate_est);
#endif

32
net/core/gen_estimator.c
View File

@ -242,6 +242,7 @@ int gen_new_estimator(struct gnet_stats_basic *bstats,
return 0;
}
EXPORT_SYMBOL(gen_new_estimator);
static void __gen_kill_estimator(struct rcu_head *head)
{
@ -275,6 +276,7 @@ void gen_kill_estimator(struct gnet_stats_basic *bstats,
call_rcu(&e->e_rcu, __gen_kill_estimator);
}
}
EXPORT_SYMBOL(gen_kill_estimator);
/**
* gen_replace_estimator - replace rate estimator configuration
@ -295,8 +297,30 @@ int gen_replace_estimator(struct gnet_stats_basic *bstats,
gen_kill_estimator(bstats, rate_est);
return gen_new_estimator(bstats, rate_est, stats_lock, opt);
}
EXPORT_SYMBOL(gen_kill_estimator);
EXPORT_SYMBOL(gen_new_estimator);
EXPORT_SYMBOL(gen_replace_estimator);
/**
* gen_estimator_active - test if estimator is currently in use
* @rate_est: rate estimator statistics
*
* Returns 1 if estimator is active, and 0 if not.
*/
int gen_estimator_active(const struct gnet_stats_rate_est *rate_est)
{
int idx;
struct gen_estimator *e;
ASSERT_RTNL();
for (idx=0; idx <= EST_MAX_INTERVAL; idx++) {
if (!elist[idx].timer.function)
continue;
list_for_each_entry(e, &elist[idx].list, list) {
if (e->rate_est == rate_est)
return 1;
}
}
return 0;
}
EXPORT_SYMBOL(gen_estimator_active);

6
net/sched/act_police.c
View File

@ -182,6 +182,12 @@ override:
R_tab = qdisc_get_rtab(&parm->rate, tb[TCA_POLICE_RATE]);
if (R_tab == NULL)
goto failure;
if (!est && !gen_estimator_active(&police->tcf_rate_est)) {
err = -EINVAL;
goto failure;
}
if (parm->peakrate.rate) {
P_tab = qdisc_get_rtab(&parm->peakrate,
tb[TCA_POLICE_PEAKRATE]);