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tc: fq: add timer_slack parameter

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Commit 583396f4ca4d ("net_sched: sch_fq: enable use of hrtimer slack")
added TCA_FQ_TIMER_SLACK parameter, with a default value of 10 usec.

Add the corresponding tc support to get/set this tunable.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
This commit is contained in:
Eric Dumazet 2020-04-27 11:05:43 -07:00 committed by Stephen Hemminger
parent 7868f802e2
commit be9ca9d541
1 changed files with 27 additions and 0 deletions
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27
tc/q_fq.c
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@ -57,6 +57,7 @@ static void explain(void)
" [ [no]pacing ] [ refill_delay TIME ]\n" " [ [no]pacing ] [ refill_delay TIME ]\n"
" [ low_rate_threshold RATE ]\n" " [ low_rate_threshold RATE ]\n"
" [ orphan_mask MASK]\n" " [ orphan_mask MASK]\n"
" [ timer_slack TIME]\n"
" [ ce_threshold TIME ]\n"); " [ ce_threshold TIME ]\n");
} }
@ -86,6 +87,7 @@ static int fq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
unsigned int refill_delay; unsigned int refill_delay;
unsigned int orphan_mask; unsigned int orphan_mask;
unsigned int ce_threshold; unsigned int ce_threshold;
unsigned int timer_slack;
bool set_plimit = false; bool set_plimit = false;
bool set_flow_plimit = false; bool set_flow_plimit = false;
bool set_quantum = false; bool set_quantum = false;
@ -96,6 +98,7 @@ static int fq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
bool set_orphan_mask = false; bool set_orphan_mask = false;
bool set_low_rate_threshold = false; bool set_low_rate_threshold = false;
bool set_ce_threshold = false; bool set_ce_threshold = false;
bool set_timer_slack = false;
int pacing = -1; int pacing = -1;
struct rtattr *tail; struct rtattr *tail;
@ -146,6 +149,20 @@ static int fq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
return -1; return -1;
} }
set_ce_threshold = true; set_ce_threshold = true;
} else if (strcmp(*argv, "timer_slack") == 0) {
__s64 t64;
NEXT_ARG();
if (get_time64(&t64, *argv)) {
fprintf(stderr, "Illegal \"timer_slack\"\n");
return -1;
}
timer_slack = t64;
if (timer_slack != t64) {
fprintf(stderr, "Illegal (out of range) \"timer_slack\"\n");
return -1;
}
set_timer_slack = true;
} else if (strcmp(*argv, "defrate") == 0) { } else if (strcmp(*argv, "defrate") == 0) {
NEXT_ARG(); NEXT_ARG();
if (strchr(*argv, '%')) { if (strchr(*argv, '%')) {
@ -240,6 +257,9 @@ static int fq_parse_opt(struct qdisc_util *qu, int argc, char **argv,
if (set_ce_threshold) if (set_ce_threshold)
addattr_l(n, 1024, TCA_FQ_CE_THRESHOLD, addattr_l(n, 1024, TCA_FQ_CE_THRESHOLD,
&ce_threshold, sizeof(ce_threshold)); &ce_threshold, sizeof(ce_threshold));
if (set_timer_slack)
addattr_l(n, 1024, TCA_FQ_TIMER_SLACK,
&timer_slack, sizeof(timer_slack));
addattr_nest_end(n, tail); addattr_nest_end(n, tail);
return 0; return 0;
} }
@ -254,6 +274,7 @@ static int fq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
unsigned int refill_delay; unsigned int refill_delay;
unsigned int orphan_mask; unsigned int orphan_mask;
unsigned int ce_threshold; unsigned int ce_threshold;
unsigned int timer_slack;
SPRINT_BUF(b1); SPRINT_BUF(b1);
@ -355,6 +376,12 @@ static int fq_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
} }
} }
if (tb[TCA_FQ_TIMER_SLACK] &&
RTA_PAYLOAD(tb[TCA_FQ_TIMER_SLACK]) >= sizeof(__u32)) {
timer_slack = rta_getattr_u32(tb[TCA_FQ_TIMER_SLACK]);
fprintf(f, "timer_slack %s ", sprint_time64(timer_slack, b1));
}
return 0; return 0;
} }