KVM: PIT: provide an option to disable interrupt reinjection

[safe/jmp/linux-2.6] / net / sched / sch_api.c

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index e7fb9e0..0fc4a18 100644 (file)
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -97,10 +97,9 @@ static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n,
 
    Auxiliary routines:
 
-   ---requeue
+   ---peek
 
-   requeues once dequeued packet. It is used for non-standard or
-   just buggy devices, which can defer output even if netif_queue_stopped()=0.
+   like dequeue but without removing a packet from the queue
 
    ---reset
 
@@ -147,8 +146,14 @@ int register_qdisc(struct Qdisc_ops *qops)
 
        if (qops->enqueue == NULL)
                qops->enqueue = noop_qdisc_ops.enqueue;
-       if (qops->requeue == NULL)
-               qops->requeue = noop_qdisc_ops.requeue;
+       if (qops->peek == NULL) {
+               if (qops->dequeue == NULL) {
+                       qops->peek = noop_qdisc_ops.peek;
+               } else {
+                       rc = -EINVAL;
+                       goto out;
+               }
+       }
        if (qops->dequeue == NULL)
                qops->dequeue = noop_qdisc_ops.dequeue;
 
@@ -184,7 +189,7 @@ EXPORT_SYMBOL(unregister_qdisc);
    (root qdisc, all its children, children of children etc.)
  */
 
-struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
+static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
 {
        struct Qdisc *q;
 
@@ -199,28 +204,16 @@ struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
        return NULL;
 }
 
-/*
- * This lock is needed until some qdiscs stop calling qdisc_tree_decrease_qlen()
- * without rtnl_lock(); currently hfsc_dequeue(), netem_dequeue(), tbf_dequeue()
- */
-static DEFINE_SPINLOCK(qdisc_list_lock);
-
 static void qdisc_list_add(struct Qdisc *q)
 {
-       if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
-               spin_lock_bh(&qdisc_list_lock);
+       if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
                list_add_tail(&q->list, &qdisc_root_sleeping(q)->list);
-               spin_unlock_bh(&qdisc_list_lock);
-       }
 }
 
 void qdisc_list_del(struct Qdisc *q)
 {
-       if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
-               spin_lock_bh(&qdisc_list_lock);
+       if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS))
                list_del(&q->list);
-               spin_unlock_bh(&qdisc_list_lock);
-       }
 }
 EXPORT_SYMBOL(qdisc_list_del);
 
@@ -229,22 +222,17 @@ struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
        unsigned int i;
        struct Qdisc *q;
 
-       spin_lock_bh(&qdisc_list_lock);
-
        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 unlock;
+                       goto out;
        }
 
        q = qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle);
-
-unlock:
-       spin_unlock_bh(&qdisc_list_lock);
-
+out:
        return q;
 }
 
@@ -417,6 +405,8 @@ static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
        struct nlattr *nest;
 
        nest = nla_nest_start(skb, TCA_STAB);
+       if (nest == NULL)
+               goto nla_put_failure;
        NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts);
        nla_nest_end(skb, nest);
 
@@ -460,7 +450,6 @@ static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
                                                 timer);
 
        wd->qdisc->flags &= ~TCQ_F_THROTTLED;
-       smp_wmb();
        __netif_schedule(qdisc_root(wd->qdisc));
 
        return HRTIMER_NORESTART;
@@ -624,7 +613,7 @@ static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
        struct Qdisc *oqdisc = dev_queue->qdisc_sleeping;
        spinlock_t *root_lock;
 
-       root_lock = qdisc_root_lock(oqdisc);
+       root_lock = qdisc_lock(oqdisc);
        spin_lock_bh(root_lock);
 
        /* Prune old scheduler */
@@ -635,7 +624,7 @@ static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
        if (qdisc == NULL)
                qdisc = &noop_qdisc;
        dev_queue->qdisc_sleeping = qdisc;
-       dev_queue->qdisc = &noop_qdisc;
+       rcu_assign_pointer(dev_queue->qdisc, &noop_qdisc);
 
        spin_unlock_bh(root_lock);
 
@@ -764,7 +753,7 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
        struct qdisc_size_table *stab;
 
        ops = qdisc_lookup_ops(kind);
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
        if (ops == NULL && kind != NULL) {
                char name[IFNAMSIZ];
                if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
@@ -830,9 +819,16 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue,
                        sch->stab = stab;
                }
                if (tca[TCA_RATE]) {
+                       spinlock_t *root_lock;
+
+                       if ((sch->parent != TC_H_ROOT) &&
+                           !(sch->flags & TCQ_F_INGRESS))
+                               root_lock = qdisc_root_sleeping_lock(sch);
+                       else
+                               root_lock = qdisc_lock(sch);
+
                        err = gen_new_estimator(&sch->bstats, &sch->rate_est,
-                                               qdisc_root_lock(sch),
-                                               tca[TCA_RATE]);
+                                               root_lock, tca[TCA_RATE]);
                        if (err) {
                                /*
                                 * Any broken qdiscs that would require
@@ -883,8 +879,12 @@ static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
        sch->stab = stab;
 
        if (tca[TCA_RATE])
+               /* NB: ignores errors from replace_estimator
+                  because change can't be undone. */
                gen_replace_estimator(&sch->bstats, &sch->rate_est,
-                                     qdisc_root_lock(sch), tca[TCA_RATE]);
+                                           qdisc_root_sleeping_lock(sch),
+                                           tca[TCA_RATE]);
+
        return 0;
 }
 
@@ -1161,8 +1161,8 @@ static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
        if (q->stab && qdisc_dump_stab(skb, q->stab) < 0)
                goto nla_put_failure;
 
-       if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
-                                        TCA_XSTATS, qdisc_root_lock(q), &d) < 0)
+       if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
+                                        qdisc_root_sleeping_lock(q), &d) < 0)
                goto nla_put_failure;
 
        if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
@@ -1453,8 +1453,8 @@ static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
        if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
                goto nla_put_failure;
 
-       if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS,
-                                        TCA_XSTATS, qdisc_root_lock(q), &d) < 0)
+       if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
+                                        qdisc_root_sleeping_lock(q), &d) < 0)
                goto nla_put_failure;
 
        if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)