pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler.

Patrick McHardy <kaber@trash.net> suggested:
> How about making this flag and the warning message (in a out-of-line
> function) globally available? Other qdiscs (f.i. HFSC) can't deal with
> inner non-work-conserving qdiscs as well.

This patch uses qdisc->flags field of "suspected" child qdisc.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 19 insertions, 15 deletions

diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 4082f39f5079..e37fe3129c17 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -85,6 +85,7 @@ extern struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
                 struct nlattr *tab);
 extern void qdisc_put_rtab(struct qdisc_rate_table *tab);
 extern void qdisc_put_stab(struct qdisc_size_table *tab);
+extern void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc);
 
 extern void __qdisc_run(struct Qdisc *q);
 
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index f8c47429044a..3d78a4d22460 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -42,9 +42,10 @@ struct Qdisc
         int                     (*enqueue)(struct sk_buff *skb, struct Qdisc *dev);
         struct sk_buff *        (*dequeue)(struct Qdisc *dev);
         unsigned                flags;
-#define TCQ_F_BUILTIN   1
-#define TCQ_F_THROTTLED 2
-#define TCQ_F_INGRESS   4
+#define TCQ_F_BUILTIN           1
+#define TCQ_F_THROTTLED         2
+#define TCQ_F_INGRESS           4
+#define TCQ_F_WARN_NONWC        (1 << 16)
         int                     padded;
         struct Qdisc_ops        *ops;
         struct qdisc_size_table *stab;
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 0fc4a18fd96f..32009793307b 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -444,6 +444,17 @@ out:
 }
 EXPORT_SYMBOL(qdisc_calculate_pkt_len);
 
+void qdisc_warn_nonwc(char *txt, struct Qdisc *qdisc)
+{
+        if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
+                printk(KERN_WARNING
+                       "%s: %s qdisc %X: is non-work-conserving?\n",
+                       txt, qdisc->ops->id, qdisc->handle >> 16);
+                qdisc->flags |= TCQ_F_WARN_NONWC;
+        }
+}
+EXPORT_SYMBOL(qdisc_warn_nonwc);
+
 static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
 {
         struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 45c31b1a4e1d..74226b265528 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -887,8 +887,7 @@ qdisc_peek_len(struct Qdisc *sch)
 
         skb = sch->ops->peek(sch);
         if (skb == NULL) {
-                if (net_ratelimit())
-                        printk("qdisc_peek_len: non work-conserving qdisc ?\n");
+                qdisc_warn_nonwc("qdisc_peek_len", sch);
                 return 0;
         }
         len = qdisc_pkt_len(skb);
@@ -1642,8 +1641,7 @@ hfsc_dequeue(struct Qdisc *sch)
 
         skb = qdisc_dequeue_peeked(cl->qdisc);
         if (skb == NULL) {
-                if (net_ratelimit())
-                        printk("HFSC: Non-work-conserving qdisc ?\n");
+                qdisc_warn_nonwc("HFSC", cl->qdisc);
                 return NULL;
         }
 
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 2f0f0b04d3fb..77ff510ef8ac 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -114,8 +114,6 @@ struct htb_class {
         struct tcf_proto *filter_list;
         int filter_cnt;
 
-        int warned;             /* only one warning about non work conserving .. */
-
         /* token bucket parameters */
         struct qdisc_rate_table *rate;  /* rate table of the class itself */
         struct qdisc_rate_table *ceil;  /* ceiling rate (limits borrows too) */
@@ -809,13 +807,8 @@ next:
                 skb = cl->un.leaf.q->dequeue(cl->un.leaf.q);
                 if (likely(skb != NULL))
                         break;
-                if (!cl->warned) {
-                        printk(KERN_WARNING
-                               "htb: class %X isn't work conserving ?!\n",
-                               cl->common.classid);
-                        cl->warned = 1;
-                }
 
+                qdisc_warn_nonwc("htb", cl->un.leaf.q);
                 htb_next_rb_node((level ? cl->parent->un.inner.ptr : q->
                                   ptr[0]) + prio);
                 cl = htb_lookup_leaf(q->row[level] + prio, prio,