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authorJiri Kosina <jkosina@suse.cz>2017-03-08 16:03:32 +0100
committerDavid S. Miller <davem@davemloft.net>2017-03-12 22:53:02 -0700
commit49b499718fa1b0d639663cfd03085b9bfd23cdc8 (patch)
tree7aab59bb529a6fe9e03ff2b5375bade8d559f061 /net/sched/sch_sfb.c
parentnet: hyperv: use new api ethtool_{get|set}_link_ksettings (diff)
downloadlinux-dev-49b499718fa1b0d639663cfd03085b9bfd23cdc8.tar.xz
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net: sched: make default fifo qdiscs appear in the dump
The original reason [1] for having hidden qdiscs (potential scalability issues in qdisc_match_from_root() with single linked list in case of large amount of qdiscs) has been invalidated by 59cc1f61f0 ("net: sched: convert qdisc linked list to hashtable"). This allows us for bringing more clarity and determinism into the dump by making default pfifo qdiscs visible. We're not turning this on by default though, at it was deemed [2] too intrusive / unnecessary change of default behavior towards userspace. Instead, TCA_DUMP_INVISIBLE netlink attribute is introduced, which allows applications to request complete qdisc hierarchy dump, including the ones that have always been implicit/invisible. Singleton noop_qdisc stays invisible, as teaching the whole infrastructure about singletons would require quite some surgery with very little gain (seeing no qdisc or seeing noop qdisc in the dump is probably setting the same user expectation). [1] http://lkml.kernel.org/r/1460732328.10638.74.camel@edumazet-glaptop3.roam.corp.google.com [2] http://lkml.kernel.org/r/20161021.105935.1907696543877061916.davem@davemloft.net Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_sfb.c')
-rw-r--r--net/sched/sch_sfb.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index fe6963d21519..ae862f172c94 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -513,6 +513,8 @@ static int sfb_change(struct Qdisc *sch, struct nlattr *opt)
if (IS_ERR(child))
return PTR_ERR(child);
+ if (child != &noop_qdisc)
+ qdisc_hash_add(child, true);
sch_tree_lock(sch);
qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,