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Date: Fri, 30 Jan 2009 10:17:01 +0000
From: Jarek Poplawski <jarkao2@...il.com>
To: Patrick McHardy <kaber@...sh.net>
Cc: David Miller <davem@...emloft.net>, devik@....cz,
netdev@...r.kernel.org
Subject: Re: [PATCH 1/3 v2 net-next] pkt_sched: sch_htb: Warn on too many
events.
On Wed, Jan 28, 2009 at 05:18:12PM +0100, Patrick McHardy wrote:
> Jarek Poplawski wrote:
>> pkt_sched: sch_htb: Warn on too many events.
...
> 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.
OK, thanks,
Jarek P.
------------------> take 2: PATCH 1/3
pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler.
Patrick McHardy <kaber@...sh.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@...il.com>
---
diff -Nurp a/include/net/pkt_sched.h b/include/net/pkt_sched.h
--- a/include/net/pkt_sched.h 2009-01-02 21:21:37.000000000 +0100
+++ b/include/net/pkt_sched.h 2009-01-29 22:57:55.000000000 +0100
@@ -85,6 +85,7 @@ extern struct qdisc_rate_table *qdisc_ge
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 -Nurp a/include/net/sch_generic.h b/include/net/sch_generic.h
--- a/include/net/sch_generic.h 2009-01-20 18:43:03.000000000 +0100
+++ b/include/net/sch_generic.h 2009-01-29 22:36:33.000000000 +0100
@@ -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 -Nurp a/net/sched/sch_api.c b/net/sched/sch_api.c
--- a/net/sched/sch_api.c 2009-01-20 18:43:10.000000000 +0100
+++ b/net/sched/sch_api.c 2009-01-30 00:35:19.000000000 +0100
@@ -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 -Nurp a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
--- a/net/sched/sch_hfsc.c 2009-01-20 18:43:10.000000000 +0100
+++ b/net/sched/sch_hfsc.c 2009-01-29 23:19:57.000000000 +0100
@@ -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 -Nurp a/net/sched/sch_htb.c b/net/sched/sch_htb.c
--- a/net/sched/sch_htb.c 2009-01-12 21:09:35.000000000 +0100
+++ b/net/sched/sch_htb.c 2009-01-29 23:07:42.000000000 +0100
@@ -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,
--
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