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mqprio: Correct stats in mqprio_dump_class_stats().

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Introduction of lockless subqueues broke the class statistics.
Before the change stats were accumulated in `bstats' and `qstats'
on the stack which was then copied to struct gnet_dump.

After the change the `bstats' and `qstats' are initialized to 0
and never updated, yet still fed to gnet_dump. The code updates
the global qdisc->cpu_bstats and qdisc->cpu_qstats instead,
clobbering them. Most likely a copy-paste error from the code in
mqprio_dump().

__gnet_stats_copy_basic() and __gnet_stats_copy_queue() accumulate
the values for per-CPU case but for global stats they overwrite
the value, so only stats from the last loop iteration / tc end up
in sch->[bq]stats.

Use the on-stack [bq]stats variables again and add the stats manually
in the global case.

Fixes: ce679e8df7 ("net: sched: add support for TCQ_F_NOLOCK subqueues to sch_mqprio")
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
https://lore.kernel.org/all/20211007175000.2334713-2-bigeasy@linutronix.de/
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2021-10-07 19:49:57 +02:00 committed by Jakub Kicinski
parent bccf56c4cb
commit 1413269086
1 changed files with 19 additions and 13 deletions
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32
net/sched/sch_mqprio.c
View File

@ -529,22 +529,28 @@ static int mqprio_dump_class_stats(struct Qdisc *sch, unsigned long cl,
for (i = tc.offset; i < tc.offset + tc.count; i++) {
struct netdev_queue *q = netdev_get_tx_queue(dev, i);
struct Qdisc *qdisc = rtnl_dereference(q->qdisc);
struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
struct gnet_stats_queue __percpu *cpu_qstats = NULL;
spin_lock_bh(qdisc_lock(qdisc));
if (qdisc_is_percpu_stats(qdisc)) {
cpu_bstats = qdisc->cpu_bstats;
cpu_qstats = qdisc->cpu_qstats;
}
qlen = qdisc_qlen_sum(qdisc);
__gnet_stats_copy_basic(NULL, &sch->bstats,
cpu_bstats, &qdisc->bstats);
__gnet_stats_copy_queue(&sch->qstats,
cpu_qstats,
&qdisc->qstats,
qlen);
if (qdisc_is_percpu_stats(qdisc)) {
qlen = qdisc_qlen_sum(qdisc);
__gnet_stats_copy_basic(NULL, &bstats,
qdisc->cpu_bstats,
&qdisc->bstats);
__gnet_stats_copy_queue(&qstats,
qdisc->cpu_qstats,
&qdisc->qstats,
qlen);
} else {
qlen += qdisc->q.qlen;
bstats.bytes += qdisc->bstats.bytes;
bstats.packets += qdisc->bstats.packets;
qstats.backlog += qdisc->qstats.backlog;
qstats.drops += qdisc->qstats.drops;
qstats.requeues += qdisc->qstats.requeues;
qstats.overlimits += qdisc->qstats.overlimits;
}
spin_unlock_bh(qdisc_lock(qdisc));
}