[PATCH net-next 00/15] net/sched: no longer acquire RTNL in qdisc dumps

Eric Dumazet
2026-04-08T12:56:14Z

This (large) series bring RTNL avoidance to qdisc dumps.

We first add annotations for data-races, so that most dump methods
can run in parallel with data path.

Then change mq and mqprio to no longer acquire each children
qdisc spinlock.

Last patch replaces RTNL with RCU for tc_dump_qdisc() and the
qdisc ops->dump() methods.

Series was too big, RTNL avoidance for class dumps will be done later.

Eric Dumazet (15):
net/sched: rename qstats_overlimit_inc() to qstats_cpu_overlimit_inc()
net/sched: add qstats_cpu_drop_inc() helper
net/sched: add READ_ONCE() in gnet_stats_add_queue[_cpu]
net/sched: add qdisc_qlen_inc() and qdisc_qlen_dec()
net/sched: annotate data-races around sch->qstats.backlog
net/sched: sch_sfb: annotate data-races in sfb_dump_stats()
net/sched: sch_red: annotate data-races in red_dump_stats()
net/sched: sch_fq_codel: remove data-races from fq_codel_dump_stats()
net/sched: sch_pie: annotate data-races in pie_dump_stats()
net/sched: sch_fq_pie: annotate data-races in fq_pie_dump_stats()
net_sched: sch_hhf: annotate data-races in hhf_dump_stats()
net/sched: sch_choke: annotate data-races in choke_dump_stats()
net/sched: sch_cake: annotate data-races in cake_dump_stats()
net/sched: mq: no longer acquire qdisc spinlocks in dump operations
net/sched: convert tc_dump_qdisc() to RCU

include/net/act_api.h | 4 +-
include/net/gen_stats.h | 9 +-
include/net/pie.h | 2 +-
include/net/sch_generic.h | 75 ++++++--
net/core/gen_estimator.c | 24 ++-
net/core/gen_stats.c | 42 ++---
net/sched/act_api.c | 2 +-
net/sched/act_bpf.c | 2 +-
net/sched/act_ife.c | 12 +-
net/sched/act_mpls.c | 2 +-
net/sched/act_police.c | 4 +-
net/sched/act_skbedit.c | 2 +-
net/sched/act_skbmod.c | 2 +-
net/sched/sch_api.c | 25 ++-
net/sched/sch_cake.c | 353 +++++++++++++++++++++-----------------
net/sched/sch_cbs.c | 6 +-
net/sched/sch_choke.c | 34 ++--
net/sched/sch_codel.c | 2 +-
net/sched/sch_drr.c | 6 +-
net/sched/sch_dualpi2.c | 4 +-
net/sched/sch_etf.c | 8 +-
net/sched/sch_ets.c | 6 +-
net/sched/sch_fq.c | 8 +-
net/sched/sch_fq_codel.c | 16 +-
net/sched/sch_fq_pie.c | 31 ++--
net/sched/sch_generic.c | 8 +-
net/sched/sch_gred.c | 4 +-
net/sched/sch_hfsc.c | 6 +-
net/sched/sch_hhf.c | 26 +--
net/sched/sch_htb.c | 6 +-
net/sched/sch_mq.c | 30 ++--
net/sched/sch_mqprio.c | 69 ++++----
net/sched/sch_multiq.c | 4 +-
net/sched/sch_netem.c | 12 +-
net/sched/sch_pie.c | 38 ++--
net/sched/sch_prio.c | 6 +-
net/sched/sch_qfq.c | 8 +-
net/sched/sch_red.c | 37 ++--
net/sched/sch_sfb.c | 54 +++---
net/sched/sch_sfq.c | 9 +-
net/sched/sch_skbprio.c | 4 +-
net/sched/sch_taprio.c | 20 +--
net/sched/sch_tbf.c | 10 +-
net/sched/sch_teql.c | 2 +-
44 files changed, 571 insertions(+), 463 deletions(-)

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2.53.0.1213.gd9a14994de-goog