sch_hfsc: report backlog information

Add backlog (byte count) information in hfsc classes and qdisc, so that
"tc -s" can report it to user, instead of 0 values :

qdisc hfsc 1: root refcnt 6 default 20
 Sent 45141660 bytes 30545 pkt (dropped 0, overlimits 91751 requeues 0)
 rate 1492Kbit 126pps backlog 103226b 74p requeues 0
...
class hfsc 1:20 parent 1:1 leaf 1201: rt m1 0bit d 0us m2 400000bit ls m1 0bit d 0us m2 200000bit
 Sent 49534912 bytes 33519 pkt (dropped 0, overlimits 0 requeues 0)
 backlog 81822b 56p requeues 0
 period 23 work 49451576 bytes rtwork 13277552 bytes level 0
...

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: John A. Sullivan III <jsullivan@opensourcedevel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 6488e6425652..9bdca2e011e9 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1368,6 +1368,7 @@ hfsc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
         struct tc_hfsc_stats xstats;
 
         cl->qstats.qlen = cl->qdisc->q.qlen;
+        cl->qstats.backlog = cl->qdisc->qstats.backlog;
         xstats.level   = cl->level;
         xstats.period  = cl->cl_vtperiod;
         xstats.work    = cl->cl_total;
@@ -1561,6 +1562,15 @@ hfsc_dump_qdisc(struct Qdisc *sch, struct sk_buff *skb)
         struct hfsc_sched *q = qdisc_priv(sch);
         unsigned char *b = skb_tail_pointer(skb);
         struct tc_hfsc_qopt qopt;
+        struct hfsc_class *cl;
+        struct hlist_node *n;
+        unsigned int i;
+
+        sch->qstats.backlog = 0;
+        for (i = 0; i < q->clhash.hashsize; i++) {
+                hlist_for_each_entry(cl, n, &q->clhash.hash[i], cl_common.hnode)
+                        sch->qstats.backlog += cl->qdisc->qstats.backlog;
+        }
 
         qopt.defcls = q->defcls;
         NLA_PUT(skb, TCA_OPTIONS, sizeof(qopt), &qopt);