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taprio: calculate cycle_time when schedule is installed 

cycle time for a particular schedule is calculated only when it is first
installed. So, it makes sense to just calculate it once right after the
'cycle_time' parameter has been parsed and store it in cycle_time.

Signed-off-by: Vedang Patel <vedang.patel@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vedang Patel 2019-06-25 15:07:15 -07:00 committed by David S. Miller
parent d14d2b2068
commit 037be03740
1 changed files with 11 additions and 18 deletions
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29
net/sched/sch_taprio.c
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@ -108,22 +108,6 @@ static void switch_schedules(struct taprio_sched *q,
*admin = NULL;
}
static ktime_t get_cycle_time(struct sched_gate_list *sched)
{
struct sched_entry *entry;
ktime_t cycle = 0;
if (sched->cycle_time != 0)
return sched->cycle_time;
list_for_each_entry(entry, &sched->entries, list)
cycle = ktime_add_ns(cycle, entry->interval);
sched->cycle_time = cycle;
return cycle;
}
static int taprio_enqueue(struct sk_buff *skb, struct Qdisc *sch,
struct sk_buff **to_free)
{
@ -524,6 +508,15 @@ static int parse_taprio_schedule(struct nlattr **tb,
if (err < 0)
return err;
if (!new->cycle_time) {
struct sched_entry *entry;
ktime_t cycle = 0;
list_for_each_entry(entry, &new->entries, list)
cycle = ktime_add_ns(cycle, entry->interval);
new->cycle_time = cycle;
}
return 0;
}
@ -605,7 +598,7 @@ static int taprio_get_start_time(struct Qdisc *sch,
return 0;
}
cycle = get_cycle_time(sched);
cycle = sched->cycle_time;
/* The qdisc is expected to have at least one sched_entry. Moreover,
* any entry must have 'interval' > 0. Thus if the cycle time is zero,
@ -632,7 +625,7 @@ static void setup_first_close_time(struct taprio_sched *q,
first = list_first_entry(&sched->entries,
struct sched_entry, list);
cycle = get_cycle_time(sched);
cycle = sched->cycle_time;
/* FIXME: find a better place to do this */
sched->cycle_close_time = ktime_add_ns(base, cycle);