1 files changed, 65 insertions, 74 deletions

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index fdb694e9f759..692d9a41cd23 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -207,7 +207,7 @@ static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
 static void qdisc_list_add(struct Qdisc *q)
 {
 	if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
-		list_add_tail(&q->list, &qdisc_root_sleeping(q)->list);
+		list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list);
 }
 
 void qdisc_list_del(struct Qdisc *q)
@@ -219,17 +219,11 @@ EXPORT_SYMBOL(qdisc_list_del);
 
 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
 {
-	unsigned int i;
 	struct Qdisc *q;
 
-	for (i = 0; i < dev->num_tx_queues; i++) {
-		struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
-		struct Qdisc *txq_root = txq->qdisc_sleeping;
-
-		q = qdisc_match_from_root(txq_root, handle);
-		if (q)
-			goto out;
-	}
+	q = qdisc_match_from_root(dev->qdisc, handle);
+	if (q)
+		goto out;
 
 	q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle);
 out:
@@ -616,32 +610,6 @@ static u32 qdisc_alloc_handle(struct net_device *dev)
 	return i>0 ? autohandle : 0;
 }
 
-/* Attach toplevel qdisc to device queue. */
-
-static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
-				     struct Qdisc *qdisc)
-{
-	struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
-	spinlock_t *root_lock;
-
-	root_lock = qdisc_lock(oqdisc);
-	spin_lock_bh(root_lock);
-
-	/* Prune old scheduler */
-	if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1)
-		qdisc_reset(oqdisc);
-
-	/* ... and graft new one */
-	if (qdisc == NULL)
-		qdisc = &noop_qdisc;
-	dev_queue->qdisc_sleeping = qdisc;
-	rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
-
-	spin_unlock_bh(root_lock);
-
-	return oqdisc;
-}
-
 void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n)
 {
 	const struct Qdisc_class_ops *cops;
@@ -710,6 +678,11 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 		if (dev->flags & IFF_UP)
 			dev_deactivate(dev);
 
+		if (new && new->ops->attach) {
+			new->ops->attach(new);
+			num_q = 0;
+		}
+
 		for (i = 0; i < num_q; i++) {
 			struct netdev_queue *dev_queue = &dev->rx_queue;
 
@@ -720,22 +693,27 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 			if (new && i > 0)
 				atomic_inc(&new->refcnt);
 
-			notify_and_destroy(skb, n, classid, old, new);
+			qdisc_destroy(old);
 		}
 
+		notify_and_destroy(skb, n, classid, dev->qdisc, new);
+		if (new && !new->ops->attach)
+			atomic_inc(&new->refcnt);
+		dev->qdisc = new ? : &noop_qdisc;
+
 		if (dev->flags & IFF_UP)
 			dev_activate(dev);
 	} else {
 		const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
 
-		err = -EINVAL;
-
-		if (cops) {
+		err = -EOPNOTSUPP;
+		if (cops && cops->graft) {
 			unsigned long cl = cops->get(parent, classid);
 			if (cl) {
 				err = cops->graft(parent, cl, new, &old);
 				cops->put(parent, cl);
-			}
+			} else
+				err = -ENOENT;
 		}
 		if (!err)
 			notify_and_destroy(skb, n, classid, old, new);
@@ -755,7 +733,8 @@ static struct lock_class_key qdisc_rx_lock;
 
 static struct Qdisc *
 qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
-	     u32 parent, u32 handle, struct nlattr **tca, int *errp)
+	     struct Qdisc *p, u32 parent, u32 handle,
+	     struct nlattr **tca, int *errp)
 {
 	int err;
 	struct nlattr *kind = tca[TCA_KIND];
@@ -832,24 +811,21 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
 		if (tca[TCA_RATE]) {
 			spinlock_t *root_lock;
 
+			err = -EOPNOTSUPP;
+			if (sch->flags & TCQ_F_MQROOT)
+				goto err_out4;
+
 			if ((sch->parent != TC_H_ROOT) &&
-			    !(sch->flags & TCQ_F_INGRESS))
+			    !(sch->flags & TCQ_F_INGRESS) &&
+			    (!p || !(p->flags & TCQ_F_MQROOT)))
 				root_lock = qdisc_root_sleeping_lock(sch);
 			else
 				root_lock = qdisc_lock(sch);
 
 			err = gen_new_estimator(&sch->bstats, &sch->rate_est,
 						root_lock, tca[TCA_RATE]);
-			if (err) {
-				/*
-				 * Any broken qdiscs that would require
-				 * a ops->reset() here? The qdisc was never
-				 * in action so it shouldn't be necessary.
-				 */
-				if (ops->destroy)
-					ops->destroy(sch);
-				goto err_out3;
-			}
+			if (err)
+				goto err_out4;
 		}
 
 		qdisc_list_add(sch);
@@ -865,6 +841,15 @@ err_out2:
 err_out:
 	*errp = err;
 	return NULL;
+
+err_out4:
+	/*
+	 * Any broken qdiscs that would require a ops->reset() here?
+	 * The qdisc was never in action so it shouldn't be necessary.
+	 */
+	if (ops->destroy)
+		ops->destroy(sch);
+	goto err_out3;
 }
 
 static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
@@ -889,13 +874,16 @@ static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
 	qdisc_put_stab(sch->stab);
 	sch->stab = stab;
 
-	if (tca[TCA_RATE])
+	if (tca[TCA_RATE]) {
 		/* NB: ignores errors from replace_estimator
 		   because change can't be undone. */
+		if (sch->flags & TCQ_F_MQROOT)
+			goto out;
 		gen_replace_estimator(&sch->bstats, &sch->rate_est,
 					    qdisc_root_sleeping_lock(sch),
 					    tca[TCA_RATE]);
-
+	}
+out:
 	return 0;
 }
 
@@ -974,9 +962,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 				q = dev->rx_queue.qdisc_sleeping;
 			}
 		} else {
-			struct netdev_queue *dev_queue;
-			dev_queue = netdev_get_tx_queue(dev, 0);
-			q = dev_queue->qdisc_sleeping;
+			q = dev->qdisc;
 		}
 		if (!q)
 			return -ENOENT;
@@ -1044,9 +1030,7 @@ replay:
 				q = dev->rx_queue.qdisc_sleeping;
 			}
 		} else {
-			struct netdev_queue *dev_queue;
-			dev_queue = netdev_get_tx_queue(dev, 0);
-			q = dev_queue->qdisc_sleeping;
+			q = dev->qdisc;
 		}
 
 		/* It may be default qdisc, ignore it */
@@ -1123,13 +1107,19 @@ create_n_graft:
 	if (!(n->nlmsg_flags&NLM_F_CREATE))
 		return -ENOENT;
 	if (clid == TC_H_INGRESS)
-		q = qdisc_create(dev, &dev->rx_queue,
+		q = qdisc_create(dev, &dev->rx_queue, p,
 				 tcm->tcm_parent, tcm->tcm_parent,
 				 tca, &err);
-	else
-		q = qdisc_create(dev, netdev_get_tx_queue(dev, 0),
+	else {
+		unsigned int ntx = 0;
+
+		if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
+			ntx = p->ops->cl_ops->select_queue(p, tcm);
+
+		q = qdisc_create(dev, netdev_get_tx_queue(dev, ntx), p,
 				 tcm->tcm_parent, tcm->tcm_handle,
 				 tca, &err);
+	}
 	if (q == NULL) {
 		if (err == -EAGAIN)
 			goto replay;
@@ -1291,8 +1281,7 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
 			s_q_idx = 0;
 		q_idx = 0;
 
-		dev_queue = netdev_get_tx_queue(dev, 0);
-		if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0)
+		if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx) < 0)
 			goto done;
 
 		dev_queue = &dev->rx_queue;
@@ -1323,7 +1312,6 @@ done:
 static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 {
 	struct net *net = sock_net(skb->sk);
-	struct netdev_queue *dev_queue;
 	struct tcmsg *tcm = NLMSG_DATA(n);
 	struct nlattr *tca[TCA_MAX + 1];
 	struct net_device *dev;
@@ -1361,7 +1349,6 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 
 	/* Step 1. Determine qdisc handle X:0 */
 
-	dev_queue = netdev_get_tx_queue(dev, 0);
 	if (pid != TC_H_ROOT) {
 		u32 qid1 = TC_H_MAJ(pid);
 
@@ -1372,7 +1359,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 		} else if (qid1) {
 			qid = qid1;
 		} else if (qid == 0)
-			qid = dev_queue->qdisc_sleeping->handle;
+			qid = dev->qdisc->handle;
 
 		/* Now qid is genuine qdisc handle consistent
 		   both with parent and child.
@@ -1383,7 +1370,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 			pid = TC_H_MAKE(qid, pid);
 	} else {
 		if (qid == 0)
-			qid = dev_queue->qdisc_sleeping->handle;
+			qid = dev->qdisc->handle;
 	}
 
 	/* OK. Locate qdisc */
@@ -1417,7 +1404,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 				goto out;
 			break;
 		case RTM_DELTCLASS:
-			err = cops->delete(q, cl);
+			err = -EOPNOTSUPP;
+			if (cops->delete)
+				err = cops->delete(q, cl);
 			if (err == 0)
 				tclass_notify(skb, n, q, cl, RTM_DELTCLASS);
 			goto out;
@@ -1431,7 +1420,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 	}
 
 	new_cl = cl;
-	err = cops->change(q, clid, pid, tca, &new_cl);
+	err = -EOPNOTSUPP;
+	if (cops->change)
+		err = cops->change(q, clid, pid, tca, &new_cl);
 	if (err == 0)
 		tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS);
 
@@ -1586,8 +1577,7 @@ static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
 	s_t = cb->args[0];
 	t = 0;
 
-	dev_queue = netdev_get_tx_queue(dev, 0);
-	if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0)
+	if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
 		goto done;
 
 	dev_queue = &dev->rx_queue;
@@ -1707,6 +1697,7 @@ static int __init pktsched_init(void)
 {
 	register_qdisc(&pfifo_qdisc_ops);
 	register_qdisc(&bfifo_qdisc_ops);
+	register_qdisc(&mq_qdisc_ops);
 	proc_net_fops_create(&init_net, "psched", 0, &psched_fops);
 
 	rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL);