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net_sched: act: remove tcfa_qstats

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tcfa_qstats is currently only used to hold drops and overlimits counters.

tcf_action_inc_drop_qstats() and tcf_action_inc_overlimit_qstats()
currently acquire a->tcfa_lock to increment these counters.

Switch to two atomic_t to get lock-free accounting.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://patch.msgid.link/20250901093141.2093176-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet
2025-09-01 09:31:41 +00:00
committed by Jakub Kicinski
parent 3016024d75
commit 5d14bbf9d1
2 changed files with 14 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
net/sched/act_api.c
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@@ -1585,7 +1585,7 @@ void tcf_action_update_stats(struct tc_action *a, u64 bytes, u64 packets,
}
_bstats_update(&a->tcfa_bstats, bytes, packets);
a->tcfa_qstats.drops += drops;
atomic_add(drops, &a->tcfa_drops);
if (hw)
_bstats_update(&a->tcfa_bstats_hw, bytes, packets);
}
@@ -1594,8 +1594,9 @@ EXPORT_SYMBOL(tcf_action_update_stats);
int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
int compat_mode)
{
int err = 0;
struct gnet_stats_queue qstats = {0};
struct gnet_dump d;
int err = 0;
if (p == NULL)
goto errout;
@@ -1619,14 +1620,17 @@ int tcf_action_copy_stats(struct sk_buff *skb, struct tc_action *p,
if (err < 0)
goto errout;
qstats.drops = atomic_read(&p->tcfa_drops);
qstats.overlimits = atomic_read(&p->tcfa_overlimits);
if (gnet_stats_copy_basic(&d, p->cpu_bstats,
&p->tcfa_bstats, false) < 0 ||
gnet_stats_copy_basic_hw(&d, p->cpu_bstats_hw,
&p->tcfa_bstats_hw, false) < 0 ||
gnet_stats_copy_rate_est(&d, &p->tcfa_rate_est) < 0 ||
gnet_stats_copy_queue(&d, p->cpu_qstats,
&p->tcfa_qstats,
p->tcfa_qstats.qlen) < 0)
&qstats,
qstats.qlen) < 0)
goto errout;
if (gnet_stats_finish_copy(&d) < 0)