diff options
| author | Jiri Kosina <jkosina@suse.cz> | 2017-03-08 16:03:32 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-12 22:53:02 -0700 |
| commit | 49b499718fa1b0d639663cfd03085b9bfd23cdc8 (patch) | |
| tree | 7aab59bb529a6fe9e03ff2b5375bade8d559f061 /include/net/sch_generic.h | |
| parent | 5e8456fdd23c23bbfa06e0d647c90758102a4410 (diff) | |
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 'include/net/sch_generic.h')
| -rw-r--r-- | include/net/sch_generic.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h index aeec4086afb2..65d502610314 100644 --- a/include/net/sch_generic.h +++ b/include/net/sch_generic.h @@ -66,6 +66,7 @@ struct Qdisc { #define TCQ_F_NOPARENT 0x40 /* root of its hierarchy : * qdisc_tree_decrease_qlen() should stop. */ +#define TCQ_F_INVISIBLE 0x80 /* invisible by default in dump */ u32 limit; const struct Qdisc_ops *ops; struct qdisc_size_table __rcu *stab; |