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net/sched: add READ_ONCE() in gnet_stats_add_queue[_cpu]

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Stats are read locklessly, add READ_ONCE() to prevent load-tearing.

Write side will be handled in separate patches.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Link: https://patch.msgid.link/20260510091455.4039245-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-05-10 09:14:48 +00:00 committed by Jakub Kicinski
parent 74154a1a1a
commit a000733242
1 changed files with 10 additions and 10 deletions
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20
net/core/gen_stats.c
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@ -345,11 +345,11 @@ static void gnet_stats_add_queue_cpu(struct gnet_stats_queue *qstats,
for_each_possible_cpu(i) {
const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i);
qstats->qlen += qcpu->qlen;
qstats->backlog += qcpu->backlog;
qstats->drops += qcpu->drops;
qstats->requeues += qcpu->requeues;
qstats->overlimits += qcpu->overlimits;
qstats->qlen += READ_ONCE(qcpu->qlen);
qstats->backlog += READ_ONCE(qcpu->backlog);
qstats->drops += READ_ONCE(qcpu->drops);
qstats->requeues += READ_ONCE(qcpu->requeues);
qstats->overlimits += READ_ONCE(qcpu->overlimits);
}
}
@ -360,11 +360,11 @@ void gnet_stats_add_queue(struct gnet_stats_queue *qstats,
if (cpu) {
gnet_stats_add_queue_cpu(qstats, cpu);
} else {
qstats->qlen += q->qlen;
qstats->backlog += q->backlog;
qstats->drops += q->drops;
qstats->requeues += q->requeues;
qstats->overlimits += q->overlimits;
qstats->qlen += READ_ONCE(q->qlen);
qstats->backlog += READ_ONCE(q->backlog);
qstats->drops += READ_ONCE(q->drops);
qstats->requeues += READ_ONCE(q->requeues);
qstats->overlimits += READ_ONCE(q->overlimits);
}
}
EXPORT_SYMBOL(gnet_stats_add_queue);