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authorPatrick McHardy <kaber@trash.net>2006-11-29 17:35:48 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:31:42 -0800
commit43effa1e57fc4635e0301b27d78f9d83afe78974 (patch)
treedc4a22fdaad074a547438050fb428f32b1cb2ded
parent9f9afec48221fe4a19f84a9341f5b304bf7d7783 (diff)
downloadop-kernel-dev-43effa1e57fc4635e0301b27d78f9d83afe78974.zip
op-kernel-dev-43effa1e57fc4635e0301b27d78f9d83afe78974.tar.gz
[NET_SCHED]: Fix endless loops caused by inaccurate qlen counters (part 1)
There are multiple problems related to qlen adjustment that can lead to an upper qdisc getting out of sync with the real number of packets queued, leading to endless dequeueing attempts by the upper layer code. All qdiscs must maintain an accurate q.qlen counter. There are basically two groups of operations affecting the qlen: operations that propagate down the tree (enqueue, dequeue, requeue, drop, reset) beginning at the root qdisc and operations only affecting a subtree or single qdisc (change, graft, delete class). Since qlen changes during operations from the second group don't propagate to ancestor qdiscs, their qlen values become desynchronized. This patch adds a function to propagate qlen changes up the qdisc tree, optionally calling a callback function to perform qdisc-internal maintenance when the child qdisc becomes empty. The follow-up patches will convert all qdiscs to use this function where necessary. Noticed by Timo Steinbach <tsteinbach@astaro.com>. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/sch_generic.h2
-rw-r--r--net/sched/sch_api.c38
2 files changed, 34 insertions, 6 deletions
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index b37572d..8208639 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -60,6 +60,7 @@ struct Qdisc_class_ops
int (*graft)(struct Qdisc *, unsigned long cl,
struct Qdisc *, struct Qdisc **);
struct Qdisc * (*leaf)(struct Qdisc *, unsigned long cl);
+ void (*qlen_notify)(struct Qdisc *, unsigned long);
/* Class manipulation routines */
unsigned long (*get)(struct Qdisc *, u32 classid);
@@ -172,6 +173,7 @@ extern void dev_activate(struct net_device *dev);
extern void dev_deactivate(struct net_device *dev);
extern void qdisc_reset(struct Qdisc *qdisc);
extern void qdisc_destroy(struct Qdisc *qdisc);
+extern void qdisc_tree_decrease_qlen(struct Qdisc *qdisc, unsigned int n);
extern struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops);
extern struct Qdisc *qdisc_create_dflt(struct net_device *dev,
struct Qdisc_ops *ops, u32 parentid);
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index d99802f..05a93da 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -191,21 +191,27 @@ int unregister_qdisc(struct Qdisc_ops *qops)
(root qdisc, all its children, children of children etc.)
*/
-struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
+static struct Qdisc *__qdisc_lookup(struct net_device *dev, u32 handle)
{
struct Qdisc *q;
- read_lock(&qdisc_tree_lock);
list_for_each_entry(q, &dev->qdisc_list, list) {
- if (q->handle == handle) {
- read_unlock(&qdisc_tree_lock);
+ if (q->handle == handle)
return q;
- }
}
- read_unlock(&qdisc_tree_lock);
return NULL;
}
+struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
+{
+ struct Qdisc *q;
+
+ read_lock(&qdisc_tree_lock);
+ q = __qdisc_lookup(dev, handle);
+ read_unlock(&qdisc_tree_lock);
+ return q;
+}
+
static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
{
unsigned long cl;
@@ -348,6 +354,26 @@ dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc)
return oqdisc;
}
+void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
+{
+ struct Qdisc_class_ops *cops;
+ unsigned long cl;
+ u32 parentid;
+
+ if (n == 0)
+ return;
+ while ((parentid = sch->parent)) {
+ sch = __qdisc_lookup(sch->dev, TC_H_MAJ(parentid));
+ cops = sch->ops->cl_ops;
+ if (cops->qlen_notify) {
+ cl = cops->get(sch, parentid);
+ cops->qlen_notify(sch, cl);
+ cops->put(sch, cl);
+ }
+ sch->q.qlen -= n;
+ }
+}
+EXPORT_SYMBOL(qdisc_tree_decrease_qlen);
/* Graft qdisc "new" to class "classid" of qdisc "parent" or
to device "dev".
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