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Message-Id: <20230128010719.2182346-8-vladimir.oltean@nxp.com>
Date: Sat, 28 Jan 2023 03:07:11 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: Vinicius Costa Gomes <vinicius.gomes@...el.com>,
Kurt Kanzenbach <kurt@...utronix.de>
Subject: [RFC PATCH net-next 07/15] net/sched: taprio: rename close_time to end_time
There is a confusion in terms in taprio which makes what is called
"close_time" to be actually used for 2 things:
1. determining when an entry "closes" such that transmitted skbs are
never allowed to overrun that time (?!)
2. an aid for determining when to advance and/or restart the schedule
using the hrtimer
It makes more sense to call this so-called "close_time" "end_time",
because it's not clear at all to me what "closes". Future patches will
hopefully make better use of the term "to close".
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
net/sched/sch_taprio.c | 52 +++++++++++++++++++++---------------------
1 file changed, 26 insertions(+), 26 deletions(-)
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index fe92a75701bd..d5d284eaab66 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -41,11 +41,11 @@ struct sched_entry {
u64 tc_gate_duration[TC_MAX_QUEUE];
struct list_head list;
- /* The instant that this entry "closes" and the next one
+ /* The instant that this entry ends and the next one
* should open, the qdisc will make some effort so that no
* packet leaves after this time.
*/
- ktime_t close_time;
+ ktime_t end_time;
ktime_t next_txtime;
atomic_t budget;
int index;
@@ -62,7 +62,7 @@ struct sched_gate_list {
struct rcu_head rcu;
struct list_head entries;
size_t num_entries;
- ktime_t cycle_close_time;
+ ktime_t cycle_end_time;
s64 cycle_time;
s64 cycle_time_extension;
s64 base_time;
@@ -591,7 +591,7 @@ static struct sk_buff *taprio_dequeue_from_txq(struct Qdisc *sch, int txq,
* guard band ...
*/
if (gate_mask != TAPRIO_ALL_GATES_OPEN &&
- ktime_after(guard, entry->close_time))
+ ktime_after(guard, entry->end_time))
return NULL;
/* ... and no budget. */
@@ -678,7 +678,7 @@ static bool should_restart_cycle(const struct sched_gate_list *oper,
if (list_is_last(&entry->list, &oper->entries))
return true;
- if (ktime_compare(entry->close_time, oper->cycle_close_time) == 0)
+ if (ktime_compare(entry->end_time, oper->cycle_end_time) == 0)
return true;
return false;
@@ -686,7 +686,7 @@ static bool should_restart_cycle(const struct sched_gate_list *oper,
static bool should_change_schedules(const struct sched_gate_list *admin,
const struct sched_gate_list *oper,
- ktime_t close_time)
+ ktime_t end_time)
{
ktime_t next_base_time, extension_time;
@@ -695,18 +695,18 @@ static bool should_change_schedules(const struct sched_gate_list *admin,
next_base_time = sched_base_time(admin);
- /* This is the simple case, the close_time would fall after
+ /* This is the simple case, the end_time would fall after
* the next schedule base_time.
*/
- if (ktime_compare(next_base_time, close_time) <= 0)
+ if (ktime_compare(next_base_time, end_time) <= 0)
return true;
- /* This is the cycle_time_extension case, if the close_time
+ /* This is the cycle_time_extension case, if the end_time
* plus the amount that can be extended would fall after the
* next schedule base_time, we can extend the current schedule
* for that amount.
*/
- extension_time = ktime_add_ns(close_time, oper->cycle_time_extension);
+ extension_time = ktime_add_ns(end_time, oper->cycle_time_extension);
/* FIXME: the IEEE 802.1Q-2018 Specification isn't clear about
* how precisely the extension should be made. So after
@@ -725,7 +725,7 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer)
struct sched_gate_list *oper, *admin;
struct sched_entry *entry, *next;
struct Qdisc *sch = q->root;
- ktime_t close_time;
+ ktime_t end_time;
spin_lock(&q->current_entry_lock);
entry = rcu_dereference_protected(q->current_entry,
@@ -744,41 +744,41 @@ static enum hrtimer_restart advance_sched(struct hrtimer *timer)
* entry of all schedules are pre-calculated during the
* schedule initialization.
*/
- if (unlikely(!entry || entry->close_time == oper->base_time)) {
+ if (unlikely(!entry || entry->end_time == oper->base_time)) {
next = list_first_entry(&oper->entries, struct sched_entry,
list);
- close_time = next->close_time;
+ end_time = next->end_time;
goto first_run;
}
if (should_restart_cycle(oper, entry)) {
next = list_first_entry(&oper->entries, struct sched_entry,
list);
- oper->cycle_close_time = ktime_add_ns(oper->cycle_close_time,
- oper->cycle_time);
+ oper->cycle_end_time = ktime_add_ns(oper->cycle_end_time,
+ oper->cycle_time);
} else {
next = list_next_entry(entry, list);
}
- close_time = ktime_add_ns(entry->close_time, next->interval);
- close_time = min_t(ktime_t, close_time, oper->cycle_close_time);
+ end_time = ktime_add_ns(entry->end_time, next->interval);
+ end_time = min_t(ktime_t, end_time, oper->cycle_end_time);
- if (should_change_schedules(admin, oper, close_time)) {
+ if (should_change_schedules(admin, oper, end_time)) {
/* Set things so the next time this runs, the new
* schedule runs.
*/
- close_time = sched_base_time(admin);
+ end_time = sched_base_time(admin);
switch_schedules(q, &admin, &oper);
}
- next->close_time = close_time;
+ next->end_time = end_time;
taprio_set_budget(q, next);
first_run:
rcu_assign_pointer(q->current_entry, next);
spin_unlock(&q->current_entry_lock);
- hrtimer_set_expires(&q->advance_timer, close_time);
+ hrtimer_set_expires(&q->advance_timer, end_time);
rcu_read_lock();
__netif_schedule(sch);
@@ -1065,8 +1065,8 @@ static int taprio_get_start_time(struct Qdisc *sch,
return 0;
}
-static void setup_first_close_time(struct taprio_sched *q,
- struct sched_gate_list *sched, ktime_t base)
+static void setup_first_end_time(struct taprio_sched *q,
+ struct sched_gate_list *sched, ktime_t base)
{
struct sched_entry *first;
ktime_t cycle;
@@ -1077,9 +1077,9 @@ static void setup_first_close_time(struct taprio_sched *q,
cycle = sched->cycle_time;
/* FIXME: find a better place to do this */
- sched->cycle_close_time = ktime_add_ns(base, cycle);
+ sched->cycle_end_time = ktime_add_ns(base, cycle);
- first->close_time = ktime_add_ns(base, first->interval);
+ first->end_time = ktime_add_ns(base, first->interval);
taprio_set_budget(q, first);
rcu_assign_pointer(q->current_entry, NULL);
}
@@ -1736,7 +1736,7 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
if (admin)
call_rcu(&admin->rcu, taprio_free_sched_cb);
} else {
- setup_first_close_time(q, new_admin, start);
+ setup_first_end_time(q, new_admin, start);
/* Protects against advance_sched() */
spin_lock_irqsave(&q->current_entry_lock, flags);
--
2.34.1
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