net-sched: consolidate default fifo qdisc setup
Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
index 95ed482..82d7d7b 100644
--- a/net/sched/sch_fifo.c
+++ b/net/sched/sch_fifo.c
@@ -107,3 +107,45 @@
.owner = THIS_MODULE,
};
EXPORT_SYMBOL(bfifo_qdisc_ops);
+
+/* Pass size change message down to embedded FIFO */
+int fifo_set_limit(struct Qdisc *q, unsigned int limit)
+{
+ struct nlattr *nla;
+ int ret = -ENOMEM;
+
+ /* Hack to avoid sending change message to non-FIFO */
+ if (strncmp(q->ops->id + 1, "fifo", 4) != 0)
+ return 0;
+
+ nla = kmalloc(nla_attr_size(sizeof(struct tc_fifo_qopt)), GFP_KERNEL);
+ if (nla) {
+ nla->nla_type = RTM_NEWQDISC;
+ nla->nla_len = nla_attr_size(sizeof(struct tc_fifo_qopt));
+ ((struct tc_fifo_qopt *)nla_data(nla))->limit = limit;
+
+ ret = q->ops->change(q, nla);
+ kfree(nla);
+ }
+ return ret;
+}
+EXPORT_SYMBOL(fifo_set_limit);
+
+struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
+ unsigned int limit)
+{
+ struct Qdisc *q;
+ int err = -ENOMEM;
+
+ q = qdisc_create_dflt(sch->dev, ops, TC_H_MAKE(sch->handle, 1));
+ if (q) {
+ err = fifo_set_limit(q, limit);
+ if (err < 0) {
+ qdisc_destroy(q);
+ q = NULL;
+ }
+ }
+
+ return q ? : ERR_PTR(err);
+}
+EXPORT_SYMBOL(fifo_create_dflt);