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net/sched: sch_choke: annotate data-races in choke_dump_stats()

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choke_dump_stats() only runs with RTNL held.
It reads fields that can be changed in qdisc fast path.
Add READ_ONCE()/WRITE_ONCE() annotations.

Fixes: edb09eb17e ("net: sched: do not acquire qdisc spinlock in qdisc/class stats dump")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://patch.msgid.link/20260423062839.2524324-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2026-04-23 06:28:39 +00:00
committed by Jakub Kicinski
parent bde34e84ed
commit d3aeb889dc
1 changed files with 16 additions and 10 deletions
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26
net/sched/sch_choke.c
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@@ -229,7 +229,7 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch,
/* Draw a packet at random from queue and compare flow */
if (choke_match_random(q, skb, &idx)) {
q->stats.matched++;
WRITE_ONCE(q->stats.matched, q->stats.matched + 1);
choke_drop_by_idx(sch, idx, to_free);
goto congestion_drop;
}
@@ -241,11 +241,13 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch,
qdisc_qstats_overlimit(sch);
if (use_harddrop(q) || !use_ecn(q) ||
!INET_ECN_set_ce(skb)) {
q->stats.forced_drop++;
WRITE_ONCE(q->stats.forced_drop,
q->stats.forced_drop + 1);
goto congestion_drop;
}
q->stats.forced_mark++;
WRITE_ONCE(q->stats.forced_mark,
q->stats.forced_mark + 1);
} else if (++q->vars.qcount) {
if (red_mark_probability(p, &q->vars, q->vars.qavg)) {
q->vars.qcount = 0;
@@ -253,11 +255,13 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch,
qdisc_qstats_overlimit(sch);
if (!use_ecn(q) || !INET_ECN_set_ce(skb)) {
q->stats.prob_drop++;
WRITE_ONCE(q->stats.prob_drop,
q->stats.prob_drop + 1);
goto congestion_drop;
}
q->stats.prob_mark++;
WRITE_ONCE(q->stats.prob_mark,
q->stats.prob_mark + 1);
}
} else
q->vars.qR = red_random(p);
@@ -272,7 +276,7 @@ static int choke_enqueue(struct sk_buff *skb, struct Qdisc *sch,
return NET_XMIT_SUCCESS;
}
q->stats.pdrop++;
WRITE_ONCE(q->stats.pdrop, q->stats.pdrop + 1);
return qdisc_drop(skb, sch, to_free);
congestion_drop:
@@ -461,10 +465,12 @@ static int choke_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
{
struct choke_sched_data *q = qdisc_priv(sch);
struct tc_choke_xstats st = {
.early = q->stats.prob_drop + q->stats.forced_drop,
.marked = q->stats.prob_mark + q->stats.forced_mark,
.pdrop = q->stats.pdrop,
.matched = q->stats.matched,
.early = READ_ONCE(q->stats.prob_drop) +
READ_ONCE(q->stats.forced_drop),
.marked = READ_ONCE(q->stats.prob_mark) +
READ_ONCE(q->stats.forced_mark),
.pdrop = READ_ONCE(q->stats.pdrop),
.matched = READ_ONCE(q->stats.matched),
};
return gnet_stats_copy_app(d, &st, sizeof(st));