[NET_SCHED]: ingress: switch back to using ingress_lock

Switch ingress queueing back to use ingress_lock. qdisc_lock_tree now locks
both the ingress and egress qdiscs on the device. All changes to data that
might be used on both ingress and egress needs to be protected by using
qdisc_lock_tree instead of manually taking dev->queue_lock. Additionally
the qdisc stats_lock needs to be initialized to ingress_lock for ingress
qdiscs.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 24 insertions, 21 deletions

diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index e92d716c915..cc941d0ee3a 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -89,9 +89,9 @@ static __inline__ int route4_fastmap_hash(u32 id, int iif)
 static inline
 void route4_reset_fastmap(struct net_device *dev, struct route4_head *head, u32 id)
 {
-	spin_lock_bh(&dev->queue_lock);
+	qdisc_lock_tree(dev);
 	memset(head->fastmap, 0, sizeof(head->fastmap));
-	spin_unlock_bh(&dev->queue_lock);
+	qdisc_unlock_tree(dev);
 }
 
 static inline void
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 0ce6914f598..8699e7006d8 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -500,12 +500,16 @@ qdisc_create(struct net_device *dev, u32 handle, struct rtattr **tca, int *errp)
 
 	if (handle == TC_H_INGRESS) {
 		sch->flags |= TCQ_F_INGRESS;
+		sch->stats_lock = &dev->ingress_lock;
 		handle = TC_H_MAKE(TC_H_INGRESS, 0);
-	} else if (handle == 0) {
-		handle = qdisc_alloc_handle(dev);
-		err = -ENOMEM;
-		if (handle == 0)
-			goto err_out3;
+	} else {
+		sch->stats_lock = &dev->queue_lock;
+		if (handle == 0) {
+			handle = qdisc_alloc_handle(dev);
+			err = -ENOMEM;
+			if (handle == 0)
+				goto err_out3;
+		}
 	}
 
 	sch->handle = handle;
@@ -654,9 +658,9 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 			return err;
 		if (q) {
 			qdisc_notify(skb, n, clid, q, NULL);
-			spin_lock_bh(&dev->queue_lock);
+			qdisc_lock_tree(dev);
 			qdisc_destroy(q);
-			spin_unlock_bh(&dev->queue_lock);
+			qdisc_unlock_tree(dev);
 		}
 	} else {
 		qdisc_notify(skb, n, clid, NULL, q);
@@ -789,17 +793,17 @@ graft:
 		err = qdisc_graft(dev, p, clid, q, &old_q);
 		if (err) {
 			if (q) {
-				spin_lock_bh(&dev->queue_lock);
+				qdisc_lock_tree(dev);
 				qdisc_destroy(q);
-				spin_unlock_bh(&dev->queue_lock);
+				qdisc_unlock_tree(dev);
 			}
 			return err;
 		}
 		qdisc_notify(skb, n, clid, old_q, q);
 		if (old_q) {
-			spin_lock_bh(&dev->queue_lock);
+			qdisc_lock_tree(dev);
 			qdisc_destroy(old_q);
-			spin_unlock_bh(&dev->queue_lock);
+			qdisc_unlock_tree(dev);
 		}
 	}
 	return 0;
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 1894eb72f6c..3385ee59254 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -42,16 +42,20 @@
  * The idea is the following:
  * - enqueue, dequeue are serialized via top level device
  *   spinlock dev->queue_lock.
+ * - ingress filtering is serialized via top level device
+ *   spinlock dev->ingress_lock.
  * - updates to tree and tree walking are only done under the rtnl mutex.
  */
 
 void qdisc_lock_tree(struct net_device *dev)
 {
 	spin_lock_bh(&dev->queue_lock);
+	spin_lock(&dev->ingress_lock);
 }
 
 void qdisc_unlock_tree(struct net_device *dev)
 {
+	spin_unlock(&dev->ingress_lock);
 	spin_unlock_bh(&dev->queue_lock);
 }
 
@@ -431,7 +435,6 @@ struct Qdisc *qdisc_alloc(struct net_device *dev, struct Qdisc_ops *ops)
 	sch->dequeue = ops->dequeue;
 	sch->dev = dev;
 	dev_hold(dev);
-	sch->stats_lock = &dev->queue_lock;
 	atomic_set(&sch->refcnt, 1);
 
 	return sch;
@@ -447,6 +450,7 @@ struct Qdisc * qdisc_create_dflt(struct net_device *dev, struct Qdisc_ops *ops,
 	sch = qdisc_alloc(dev, ops);
 	if (IS_ERR(sch))
 		goto errout;
+	sch->stats_lock = &dev->queue_lock;
 	sch->parent = parentid;
 
 	if (!ops->init || ops->init(sch, NULL) == 0)
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 1fb60aba1e6..ad22dc6af22 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -248,16 +248,11 @@ ing_hook(unsigned int hook, struct sk_buff **pskb,
 		skb->dev ? (*pskb)->dev->name : "(no dev)",
 		skb->len);
 
-/*
-revisit later: Use a private since lock dev->queue_lock is also
-used on the egress (might slow things for an iota)
-*/
-
 	if (dev->qdisc_ingress) {
-		spin_lock(&dev->queue_lock);
+		spin_lock(&dev->ingress_lock);
 		if ((q = dev->qdisc_ingress) != NULL)
 			fwres = q->enqueue(skb, q);
-		spin_unlock(&dev->queue_lock);
+		spin_unlock(&dev->ingress_lock);
 	}
 
 	return fwres;