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143976ce99
linux/net/sched
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WANG Cong 143976ce99 net_sched: remove tc class reference counting 
For TC classes, their ->get() and ->put() are always paired, and the
reference counting is completely useless, because:

1) For class modification and dumping paths, we already hold RTNL lock,
   so all of these ->get(),->change(),->put() are atomic.

2) For filter bindiing/unbinding, we use other reference counter than
   this one, and they should have RTNL lock too.

3) For ->qlen_notify(), it is special because it is called on ->enqueue()
   path, but we already hold qdisc tree lock there, and we hold this
   tree lock when graft or delete the class too, so it should not be gone
   or changed until we release the tree lock.

Therefore, this patch removes ->get() and ->put(), but:

1) Adds a new ->find() to find the pointer to a class by classid, no
   refcnt.

2) Move the original class destroy upon the last refcnt into ->delete(),
   right after releasing tree lock. This is fine because the class is
   already removed from hash when holding the lock.

For those who also use ->put() as ->unbind(), just rename them to reflect
this change.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-25 17:19:10 -07:00
..
act_api.c rtnetlink: make rtnl_register accept a flags parameter 2017-08-09 16:57:38 -07:00
act_bpf.c bpf: expose prog id for cls_bpf and act_bpf 2017-06-21 15:14:23 -04:00
act_connmark.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_csum.c net: Remove all references to SKB_GSO_UDP. 2017-07-17 09:52:58 -07:00
act_gact.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_ife.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_ipt.c net: sched: fix NULL pointer dereference when action calls some targets 2017-08-18 16:25:49 -07:00
act_meta_mark.c Support to encoding decoding skb mark on IFE action 2016-03-01 17:15:23 -05:00
act_meta_skbprio.c Support to encoding decoding skb prio on IFE action 2016-03-01 17:15:23 -05:00
act_meta_skbtcindex.c net sched ife action: Introduce skb tcindex metadata encap decap 2016-09-19 21:55:28 -04:00
act_mirred.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_nat.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_pedit.c net/act_pedit: fix an error code 2017-06-14 15:24:18 -04:00
act_police.c net_sched: move tcf_lock down after gen_replace_estimator() 2017-06-14 14:39:19 -04:00
act_sample.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_simple.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_skbedit.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_skbmod.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
act_tunnel_key.c net: sched: act_tunnel_key: make UDP checksum configurable 2017-06-15 14:21:03 -04:00
act_vlan.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
cls_api.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
cls_basic.c net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_bpf.c net: sched: remove cops->tcf_cl_offload 2017-08-11 13:47:01 -07:00
cls_cgroup.c net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_flow.c net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_flower.c net: sched: cls_flower: fix ndo_setup_tc type for stats call 2017-08-16 14:29:41 -07:00
cls_fw.c net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_matchall.c net: sched: remove cops->tcf_cl_offload 2017-08-11 13:47:01 -07:00
cls_route.c net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_rsvp6.c
cls_rsvp.c
cls_rsvp.h net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_tcindex.c net_sched: use void pointer for filter handle 2017-08-07 14:12:17 -07:00
cls_u32.c net: sched: remove cops->tcf_cl_offload 2017-08-11 13:47:01 -07:00
em_canid.c net: sched: remove tcf_proto from ematch calls 2014-10-06 18:02:32 -04:00
em_cmp.c
em_ipset.c netfilter: x_tables: move hook state into xt_action_param structure 2016-11-03 10:56:21 +01:00
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: remove tcf_proto from ematch calls 2014-10-06 18:02:32 -04:00
em_text.c net: Remove state argument from skb_find_text() 2015-02-22 15:59:54 -05:00
em_u32.c
ematch.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
Kconfig net: sched: select cls when cls_act is enabled 2017-06-05 10:56:36 -04:00
Makefile net/sched: Introduce sample tc action 2017-01-24 13:44:28 -05:00
sch_api.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_atm.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_blackhole.c net_sched: drop packets after root qdisc lock is released 2016-06-25 12:19:35 -04:00
sch_cbq.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_choke.c treewide: use kv[mz]alloc* rather than opencoded variants 2017-05-08 17:15:13 -07:00
sch_codel.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
sch_drr.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_dsmark.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_fifo.c sched: don't use skb queue helpers 2016-09-19 01:47:18 -04:00
sch_fq_codel.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_fq.c mm, tree wide: replace __GFP_REPEAT by __GFP_RETRY_MAYFAIL with more useful semantic 2017-07-12 16:26:03 -07:00
sch_generic.c qdisc: add tracepoint qdisc:qdisc_dequeue for dequeued SKBs 2017-08-16 14:10:10 -07:00
sch_gred.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
sch_hfsc.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_hhf.c treewide: use kv[mz]alloc* rather than opencoded variants 2017-05-08 17:15:13 -07:00
sch_htb.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_ingress.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_mq.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_mqprio.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_multiq.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_netem.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_pie.c netlink: pass extended ACK struct to parsing functions 2017-04-13 13:58:22 -04:00
sch_plug.c net_sched: drop packets after root qdisc lock is released 2016-06-25 12:19:35 -04:00
sch_prio.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_qfq.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_red.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_sfb.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_sfq.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_tbf.c net_sched: remove tc class reference counting 2017-08-25 17:19:10 -07:00
sch_teql.c net: make ndo_get_stats64 a void function 2017-01-08 17:51:44 -05:00