netdev: Create netdev_queue abstraction.

A netdev_queue is an entity managed by a qdisc.

Currently there is one RX and one TX queue, and a netdev_queue merely
contains a backpointer to the net_device.

The Qdisc struct is augmented with a netdev_queue pointer as well.

Eventually the 'dev' Qdisc member will go away and we will have the
resulting hierarchy:

	net_device --> netdev_queue --> Qdisc

Also, qdisc_alloc() and qdisc_create_dflt() now take a netdev_queue
pointer argument.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 4 deletions

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 13afa7214392..d97086480893 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -440,7 +440,9 @@ static struct Qdisc_ops pfifo_fast_ops __read_mostly = {
         .owner          =       THIS_MODULE,
 };
 
-struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops)
+struct Qdisc *qdisc_alloc(struct net_device *dev,
+                          struct netdev_queue *dev_queue,
+                          struct Qdisc_ops *ops)
 {
         void *p;
         struct Qdisc *sch;
@@ -462,6 +464,7 @@ struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops)
         sch->ops = ops;
         sch->enqueue = ops->enqueue;
         sch->dequeue = ops->dequeue;
+        sch->dev_queue = dev_queue;
         sch->dev = dev;
         dev_hold(dev);
         atomic_set(&sch->refcnt, 1);
@@ -471,12 +474,14 @@ errout:
         return ERR_PTR(err);
 }
 
-struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops,
+struct Qdisc * qdisc_create_dflt(struct net_device *dev,
+                                 struct netdev_queue *dev_queue,
+                                 struct Qdisc_ops *ops,
                                  unsigned int parentid)
 {
         struct Qdisc *sch;
 
-        sch = qdisc_alloc(dev, ops);
+        sch = qdisc_alloc(dev, dev_queue, ops);
         if (IS_ERR(sch))
                 goto errout;
         sch->stats_lock = &dev->queue_lock;
@@ -545,7 +550,8 @@ void dev_activate(struct net_device *dev)
         if (dev->qdisc_sleeping == &noop_qdisc) {
                 struct Qdisc *qdisc;
                 if (dev->tx_queue_len) {
-                        qdisc = qdisc_create_dflt(dev, &pfifo_fast_ops,
+                        qdisc = qdisc_create_dflt(dev, &dev->tx_queue,
+                                                  &pfifo_fast_ops,
                                                   TC_H_ROOT);
                         if (qdisc == NULL) {
                                 printk(KERN_INFO "%s: activation failed\n", dev->name);