Vlad Buslov 1f17f7742e net: sched: flower: insert filter to ht before offloading it to hw ... John reports: Recent refactoring of fl_change aims to use the classifier spinlock to avoid the need for rtnl lock. In doing so, the fl_hw_replace_filer() function was moved to before the lock is taken. This can create problems for drivers if duplicate filters are created (commmon in ovs tc offload due to filters being triggered by user-space matches). Drivers registered for such filters will now receive multiple copies of the same rule, each with a different cookie value. This means that the drivers would need to do a full match field lookup to determine duplicates, repeating work that will happen in flower __fl_lookup(). Currently, drivers do not expect to receive duplicate filters. To fix this, verify that filter with same key is not present in flower classifier hash table and insert the new filter to the flower hash table before offloading it to hardware. Implement helper function fl_ht_insert_unique() to atomically verify/insert a filter. This change makes filter visible to fast path at the beginning of fl_change() function, which means it can no longer be freed directly in case of error. Refactor fl_change() error handling code to deallocate the filter with rcu timeout. Fixes: 620da48608 ("net: sched: flower: refactor fl_change") Reported-by: John Hurley <john.hurley@netronome.com> Signed-off-by: Vlad Buslov <vladbu@mellanox.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2019-04-07 19:33:07 -07:00
..
act_api.c	net/sched: let actions use RCU to access 'goto_chain'	2019-03-21 13:26:42 -07:00
act_bpf.c	net/sched: act_bpf: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_connmark.c	net/sched: act_connmark: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_csum.c	net/sched: act_csum: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_gact.c	net/sched: act_gact: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_ife.c	net/sched: act_ife: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_ipt.c	net/sched: prepare TC actions to properly validate the control action	2019-03-21 13:26:41 -07:00
act_meta_mark.c	net: remove duplicate includes	2017-12-13 13:18:46 -05:00
act_meta_skbprio.c	net sched actions: change IFE modules alias names	2017-10-12 22:13:20 -07:00
act_meta_skbtcindex.c	net: remove duplicate includes	2017-12-13 13:18:46 -05:00
act_mirred.c	net: sched: fix cleanup NULL pointer exception in act_mirr	2019-03-23 21:36:04 -04:00
act_nat.c	net/sched: act_nat: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_pedit.c	net/sched: act_pedit: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_police.c	net/sched: act_police: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_sample.c	net/sched: act_sample: fix divide by zero in the traffic path	2019-04-04 10:46:33 -07:00
act_simple.c	net/sched: act_simple: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_skbedit.c	net/sched: act_skbedit: validate the control action inside init()	2019-03-21 13:26:41 -07:00
act_skbmod.c	net/sched: act_skbmod: validate the control action inside init()	2019-03-21 13:26:42 -07:00
act_tunnel_key.c	net/sched: act_tunnel_key: validate the control action inside init()	2019-03-21 13:26:42 -07:00
act_vlan.c	net/sched: act_vlan: validate the control action inside init()	2019-03-21 13:26:42 -07:00
cls_api.c	net: sched: don't set tunnel for decap action	2019-04-02 13:20:30 -07:00
cls_basic.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_bpf.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_cgroup.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_flow.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_flower.c	net: sched: flower: insert filter to ht before offloading it to hw	2019-04-07 19:33:07 -07:00
cls_fw.c	Revert "net: sched: fw: don't set arg->stop in fw_walk() when empty"	2019-02-27 10:12:19 -08:00
cls_matchall.c	net/sched: fix ->get helper of the matchall cls	2019-04-01 14:13:25 -07:00
cls_route.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_rsvp6.c
cls_rsvp.c
cls_rsvp.h	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_tcindex.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
cls_u32.c	net_sched: initialize net pointer inside tcf_exts_init()	2019-02-22 15:26:51 -08:00
em_canid.c
em_cmp.c
em_ipset.c
em_ipt.c	net: sched: add em_ipt ematch for calling xtables matches	2018-02-21 13:15:33 -05:00
em_meta.c	net: convert sock.sk_refcnt from atomic_t to refcount_t	2017-07-01 07:39:08 -07:00
em_nbyte.c	net: sched: em_nbyte: don't add the data offset twice	2018-01-24 14:52:40 -05:00
em_text.c
em_u32.c
ematch.c	net: sched: ematch: obtain net pointer from blocks	2017-10-16 21:00:40 +01:00
Kconfig	net: sched: Kconfig: update reference link for PIE	2019-03-26 11:17:09 -07:00
Makefile	tc: Add support for configuring the taprio scheduler	2018-10-04 13:52:23 -07:00
sch_api.c	net_sched: return correct value for *notify* functions	2019-03-13 13:48:27 -07:00
sch_atm.c	net: sched: rename qdisc_destroy() to qdisc_put()	2018-09-25 20:17:35 -07:00
sch_blackhole.c	net_sched: blackhole: tell upper qdisc about dropped packets	2018-06-17 08:42:33 +09:00
sch_cake.c	sch_cake: Make sure we can write the IP header before changing DSCP bits	2019-04-04 10:55:59 -07:00
sch_cbq.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_cbs.c	sched: Avoid dereferencing skb pointer after child enqueue	2019-01-15 20:12:00 -08:00
sch_choke.c	net: sched: sch: add extack for change qdisc ops	2017-12-21 12:32:50 -05:00
sch_codel.c	net: sched: sch: add extack for change qdisc ops	2017-12-21 12:32:50 -05:00
sch_drr.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_dsmark.c	sched: Avoid dereferencing skb pointer after child enqueue	2019-01-15 20:12:00 -08:00
sch_etf.c	etf: Drop all expired packets	2018-11-16 20:39:34 -08:00
sch_fifo.c	net: sched: rename qdisc_destroy() to qdisc_put()	2018-09-25 20:17:35 -07:00
sch_fq_codel.c	net: Add and use skb_mark_not_on_list().	2018-09-10 10:06:54 -07:00
sch_fq.c	net_sched: sch_fq: avoid calling ktime_get_ns() if not needed	2018-11-20 09:51:32 -08:00
sch_generic.c	net: sched: add empty status flag for NOLOCK qdisc	2019-03-23 21:52:36 -04:00
sch_gred.c	net: sched: gred: support reporting stats from offloads	2018-11-19 18:53:46 -08:00
sch_hfsc.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_hhf.c	net: Add and use skb_mark_not_on_list().	2018-09-10 10:06:54 -07:00
sch_htb.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_ingress.c	net: sched: allow ingress and clsact qdiscs to share filter blocks	2018-01-17 14:53:57 -05:00
sch_mq.c	net: sched: introduce and use qstats read helpers	2019-04-01 14:50:13 -07:00
sch_mqprio.c	net: sched: introduce and use qstats read helpers	2019-04-01 14:50:13 -07:00
sch_multiq.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_netem.c	net: netem: fix skb length BUG_ON in __skb_to_sgvec	2019-02-28 10:31:31 -08:00
sch_pie.c	net: sched: pie: avoid slow division in drop probability decay	2019-02-28 10:35:41 -08:00
sch_plug.c	net: sched: sch: add extack for change qdisc ops	2017-12-21 12:32:50 -05:00
sch_prio.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_qfq.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_red.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_sfb.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_sfq.c	net: sch: api: add extack support in tcf_block_get	2017-12-21 12:32:51 -05:00
sch_skbprio.c	net/sched: add skbprio scheduler	2018-07-24 14:44:00 -07:00
sch_taprio.c	net: sched: introduce and use qstats read helpers	2019-04-01 14:50:13 -07:00
sch_tbf.c	net: sched: introduce and use qdisc tree flush/purge helpers	2019-04-01 14:50:13 -07:00
sch_teql.c	net: sched: sch: add extack for init callback	2017-12-21 12:32:50 -05:00