1 files changed, 53 insertions, 0 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 51b968d3febb..2adda7fa2d39 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -200,6 +200,58 @@ int unregister_qdisc(struct Qdisc_ops *qops)
 }
 EXPORT_SYMBOL(unregister_qdisc);
 
+/* Get default qdisc if not otherwise specified */
+void qdisc_get_default(char *name, size_t len)
+{
+        read_lock(&qdisc_mod_lock);
+        strlcpy(name, default_qdisc_ops->id, len);
+        read_unlock(&qdisc_mod_lock);
+}
+
+static struct Qdisc_ops *qdisc_lookup_default(const char *name)
+{
+        struct Qdisc_ops *q = NULL;
+
+        for (q = qdisc_base; q; q = q->next) {
+                if (!strcmp(name, q->id)) {
+                        if (!try_module_get(q->owner))
+                                q = NULL;
+                        break;
+                }
+        }
+
+        return q;
+}
+
+/* Set new default qdisc to use */
+int qdisc_set_default(const char *name)
+{
+        const struct Qdisc_ops *ops;
+
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
+        write_lock(&qdisc_mod_lock);
+        ops = qdisc_lookup_default(name);
+        if (!ops) {
+                /* Not found, drop lock and try to load module */
+                write_unlock(&qdisc_mod_lock);
+                request_module("sch_%s", name);
+                write_lock(&qdisc_mod_lock);
+
+                ops = qdisc_lookup_default(name);
+        }
+
+        if (ops) {
+                /* Set new default */
+                module_put(default_qdisc_ops->owner);
+                default_qdisc_ops = ops;
+        }
+        write_unlock(&qdisc_mod_lock);
+
+        return ops ? 0 : -ENOENT;
+}
+
 /* We know handle. Find qdisc among all qdisc's attached to device
    (root qdisc, all its children, children of children etc.)
  */
@@ -1854,6 +1906,7 @@ static int __init pktsched_init(void)
                 return err;
         }
 
+        register_qdisc(&pfifo_fast_ops);
         register_qdisc(&pfifo_qdisc_ops);
         register_qdisc(&bfifo_qdisc_ops);
         register_qdisc(&pfifo_head_drop_qdisc_ops);