Commit cb395b20 authored May 10, 2017 by Eric Dumazet Committed by David S. Miller May 11, 2017

net: sched: optimize class dumps



In commit 59cc1f61 ("net: sched: convert qdisc linked list to
hashtable") we missed the opportunity to considerably speed up
tc_dump_tclass_root() if a qdisc handle is provided by user.

Instead of iterating all the qdiscs, use qdisc_match_from_root()
to directly get the one we look for.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b451e5d2

net/sched/sch_api.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -1831,6 +1831,12 @@ static int tc_dump_tclass_root(struct Qdisc root, struct sk_buff skb,
		if (!qdisc_dev(root))
		return 0;

		if (tcm->tcm_parent) {
		q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
		if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
		return -1;
		return 0;
		}
		hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
		if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
		return -1;