This allows a cycle-time and a cycle-time-extension to be specified.
Specifying a cycle-time will truncate that cycle, so when that instant
is reached, the cycle will start from its beginning.
A cycle-time-extension may cause the last entry of a cycle, just
before the start of a new schedule (the base-time of the "admin"
schedule) to be extended by at maximum "cycle-time-extension"
nanoseconds. The idea of this feauture, as described by the IEEE
802.1Q, is too avoid too narrow gate states.
Example:
tc qdisc change dev IFACE parent root handle 100 taprio \
sched-entry S 0x1 1000000 \
sched-entry S 0x0 2000000 \
sched-entry S 0x1 3000000 \
sched-entry S 0x0 4000000 \
cycle-time-extension 100000 \
cycle-time 9000000 \
base-time 12345678900000000
Signed-off-by: Vinicius Costa Gomes <vinicius.go...@intel.com>
---
tc/q_taprio.c | 64 ++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 53 insertions(+), 11 deletions(-)
diff --git a/tc/q_taprio.c b/tc/q_taprio.c
index 336bb245..aad055d8 100644
--- a/tc/q_taprio.c
+++ b/tc/q_taprio.c
@@ -155,8 +155,10 @@ static int taprio_parse_opt(struct qdisc_util *qu, int
argc,
{
__s32 clockid = CLOCKID_INVALID;
struct tc_mqprio_qopt opt = { };
+ __s64 cycle_time_extension = 0;
struct list_head sched_entries;
- struct rtattr *tail;
+ struct rtattr *tail, *l;
+ __s64 cycle_time = 0;
__s64 base_time = 0;
int err, idx;
@@ -245,6 +247,29 @@ static int taprio_parse_opt(struct qdisc_util *qu, int
argc,
PREV_ARG();
break;
}
+ } else if (strcmp(*argv, "cycle-time") == 0) {
+ NEXT_ARG();
+ if (cycle_time) {
+ fprintf(stderr, "taprio: duplicate
\"cycle-time\" specification\n");
+ return -1;
+ }
+
+ if (get_s64(&cycle_time, *argv, 10)) {
+ PREV_ARG();
+ break;
+ }
+
+ } else if (strcmp(*argv, "cycle-time-extension") == 0) {
+ NEXT_ARG();
+ if (cycle_time_extension) {
+ fprintf(stderr, "taprio: duplicate
\"cycle-time-extension\" specification\n");
+ return -1;
+ }
+
+ if (get_s64(&cycle_time_extension, *argv, 10)) {
+ PREV_ARG();
+ break;
+ }
} else if (strcmp(*argv, "clockid") == 0) {
NEXT_ARG();
if (clockid != CLOCKID_INVALID) {
@@ -277,19 +302,24 @@ static int taprio_parse_opt(struct qdisc_util *qu, int
argc,
if (base_time)
addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_BASE_TIME, &base_time,
sizeof(base_time));
- if (!list_empty(&sched_entries)) {
- struct rtattr *entry_list;
- entry_list = addattr_nest(n, 1024,
TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST | NLA_F_NESTED);
+ if (cycle_time)
+ addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME,
+ &cycle_time, sizeof(cycle_time));
- err = add_sched_list(&sched_entries, n);
- if (err < 0) {
- fprintf(stderr, "Could not add schedule to netlink
message\n");
- return -1;
- }
+ if (cycle_time_extension)
+ addattr_l(n, 1024, TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION,
+ &cycle_time_extension, sizeof(cycle_time_extension));
+
+ l = addattr_nest(n, 1024, TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST |
NLA_F_NESTED);
- addattr_nest_end(n, entry_list);
+ err = add_sched_list(&sched_entries, n);
+ if (err < 0) {
+ fprintf(stderr, "Could not add schedule to netlink message\n");
+ return -1;
}
+ addattr_nest_end(n, l);
+
tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
return 0;
@@ -345,13 +375,25 @@ static int print_sched_list(FILE *f, struct rtattr *list)
static int print_schedule(FILE *f, struct rtattr **tb)
{
- int64_t base_time = 0;
+ int64_t base_time = 0, cycle_time = 0, cycle_time_extension = 0;
if (tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME])
base_time =
rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_BASE_TIME]);
+ if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME])
+ cycle_time =
rta_getattr_s64(tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME]);
+
+ if (tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION])
+ cycle_time_extension = rta_getattr_s64(
+ tb[TCA_TAPRIO_ATTR_SCHED_CYCLE_TIME_EXTENSION]);
+
print_lluint(PRINT_ANY, "base_time", "\tbase-time %lld", base_time);
+ print_lluint(PRINT_ANY, "cycle_time", " cycle-time %lld", cycle_time);
+
+ print_lluint(PRINT_ANY, "cycle_time_extension",
+ " cycle-time-extension %lld", cycle_time_extension);
+
print_sched_list(f, tb[TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST]);
return 0;
--
2.21.0
