diff options
| author |   Phil Sutter <phil@nwl.cc> | 2018-10-18 10:34:26 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-10-18 16:00:02 -0700 |
| commit | 3c53ed8fef6881a864f0ee8240ed2793ef73ad0d (patch) | |
| tree | 919d4fbb499bbca7812fa8fb1d4a37d544eb586b /net | |
| parent | r8169: fix NAPI handling under high load (diff) | |
| download | linux-dev-3c53ed8fef6881a864f0ee8240ed2793ef73ad0d.tar.xz linux-dev-3c53ed8fef6881a864f0ee8240ed2793ef73ad0d.zip | |
net: sched: Fix for duplicate class dump
When dumping classes by parent, kernel would return classes twice:
| # tc qdisc add dev lo root prio
| # tc class show dev lo
| class prio 8001:1 parent 8001:
| class prio 8001:2 parent 8001:
| class prio 8001:3 parent 8001:
| # tc class show dev lo parent 8001:
| class prio 8001:1 parent 8001:
| class prio 8001:2 parent 8001:
| class prio 8001:3 parent 8001:
| class prio 8001:1 parent 8001:
| class prio 8001:2 parent 8001:
| class prio 8001:3 parent 8001:
This comes from qdisc_match_from_root() potentially returning the root
qdisc itself if its handle matched. Though in that case, root's classes
were already dumped a few lines above.
Fixes: cb395b2010879 ("net: sched: optimize class dumps")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sched/sch_api.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 6684641ea344..3dc0acf54245 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -2059,7 +2059,8 @@ static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, 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) + if (q && q != root && + tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) return -1; return 0; } |