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net: sched: introduce and use qstats read helpers

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Classful qdiscs can't access directly the child qdiscs backlog
length: if such qdisc is NOLOCK, per CPU values should be
accounted instead.

Most qdiscs no not respect the above. As a result, qstats fetching
for most classful qdisc is currently incorrect: if the child qdisc is
NOLOCK, it always reports 0 len backlog.

This change introduces a pair of helpers to safely fetch
both backlog and qlen and use them in stats class dumping
functions, fixing the above issue and cleaning a bit the code.

DRR needs also to access the child qdisc queue length, so it
needs custom handling.

Fixes: c5ad119fb6 ("net: sched: pfifo_fast use skb_array")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
2019-03-28 16:53:12 +01:00
committed by David S. Miller
parent 0db6f8befc
commit 5dd431b6b9
11 changed files with 36 additions and 17 deletions
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18
include/net/sch_generic.h
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@@ -923,6 +923,24 @@ static inline void qdisc_qstats_overlimit(struct Qdisc *sch)
sch->qstats.overlimits++;
}
static inline int qdisc_qstats_copy(struct gnet_dump *d, struct Qdisc *sch)
{
__u32 qlen = qdisc_qlen_sum(sch);
return gnet_stats_copy_queue(d, sch->cpu_qstats, &sch->qstats, qlen);
}
static inline void qdisc_qstats_qlen_backlog(struct Qdisc *sch, __u32 *qlen,
__u32 *backlog)
{
struct gnet_stats_queue qstats = { 0 };
__u32 len = qdisc_qlen_sum(sch);
__gnet_stats_copy_queue(&qstats, sch->cpu_qstats, &sch->qstats, len);
*qlen = qstats.qlen;
*backlog = qstats.backlog;
}
static inline void qdisc_skb_head_init(struct qdisc_skb_head *qh)
{
qh->head = NULL;