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Diffstat (limited to 'net/sched/sch_generic.c')
-rw-r--r--net/sched/sch_generic.c70
1 files changed, 58 insertions, 12 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index bf8c81e07c70..3839cbbdc32b 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -288,9 +288,9 @@ unsigned long dev_trans_start(struct net_device *dev)
}
EXPORT_SYMBOL(dev_trans_start);
-static void dev_watchdog(unsigned long arg)
+static void dev_watchdog(struct timer_list *t)
{
- struct net_device *dev = (struct net_device *)arg;
+ struct net_device *dev = from_timer(dev, t, watchdog_timer);
netif_tx_lock(dev);
if (!qdisc_tx_is_noop(dev)) {
@@ -603,8 +603,14 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
struct Qdisc *sch;
unsigned int size = QDISC_ALIGN(sizeof(*sch)) + ops->priv_size;
int err = -ENOBUFS;
- struct net_device *dev = dev_queue->dev;
+ struct net_device *dev;
+
+ if (!dev_queue) {
+ err = -EINVAL;
+ goto errout;
+ }
+ dev = dev_queue->dev;
p = kzalloc_node(size, GFP_KERNEL,
netdev_queue_numa_node_read(dev_queue));
@@ -689,10 +695,8 @@ void qdisc_reset(struct Qdisc *qdisc)
}
EXPORT_SYMBOL(qdisc_reset);
-static void qdisc_rcu_free(struct rcu_head *head)
+static void qdisc_free(struct Qdisc *qdisc)
{
- struct Qdisc *qdisc = container_of(head, struct Qdisc, rcu_head);
-
if (qdisc_is_percpu_stats(qdisc)) {
free_percpu(qdisc->cpu_bstats);
free_percpu(qdisc->cpu_qstats);
@@ -725,11 +729,7 @@ void qdisc_destroy(struct Qdisc *qdisc)
kfree_skb_list(qdisc->gso_skb);
kfree_skb(qdisc->skb_bad_txq);
- /*
- * gen_estimator est_timer() might access qdisc->q.lock,
- * wait a RCU grace period before freeing qdisc.
- */
- call_rcu(&qdisc->rcu_head, qdisc_rcu_free);
+ qdisc_free(qdisc);
}
EXPORT_SYMBOL(qdisc_destroy);
@@ -960,7 +960,7 @@ void dev_init_scheduler(struct net_device *dev)
if (dev_ingress_queue(dev))
dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
- setup_timer(&dev->watchdog_timer, dev_watchdog, (unsigned long)dev);
+ timer_setup(&dev->watchdog_timer, dev_watchdog, 0);
}
static void shutdown_scheduler_queue(struct net_device *dev,
@@ -1024,3 +1024,49 @@ void psched_ratecfg_precompute(struct psched_ratecfg *r,
}
}
EXPORT_SYMBOL(psched_ratecfg_precompute);
+
+static void mini_qdisc_rcu_func(struct rcu_head *head)
+{
+}
+
+void mini_qdisc_pair_swap(struct mini_Qdisc_pair *miniqp,
+ struct tcf_proto *tp_head)
+{
+ struct mini_Qdisc *miniq_old = rtnl_dereference(*miniqp->p_miniq);
+ struct mini_Qdisc *miniq;
+
+ if (!tp_head) {
+ RCU_INIT_POINTER(*miniqp->p_miniq, NULL);
+ return;
+ }
+
+ miniq = !miniq_old || miniq_old == &miniqp->miniq2 ?
+ &miniqp->miniq1 : &miniqp->miniq2;
+
+ /* We need to make sure that readers won't see the miniq
+ * we are about to modify. So wait until previous call_rcu_bh callback
+ * is done.
+ */
+ rcu_barrier_bh();
+ miniq->filter_list = tp_head;
+ rcu_assign_pointer(*miniqp->p_miniq, miniq);
+
+ if (miniq_old)
+ /* This is counterpart of the rcu barrier above. We need to
+ * block potential new user of miniq_old until all readers
+ * are not seeing it.
+ */
+ call_rcu_bh(&miniq_old->rcu, mini_qdisc_rcu_func);
+}
+EXPORT_SYMBOL(mini_qdisc_pair_swap);
+
+void mini_qdisc_pair_init(struct mini_Qdisc_pair *miniqp, struct Qdisc *qdisc,
+ struct mini_Qdisc __rcu **p_miniq)
+{
+ miniqp->miniq1.cpu_bstats = qdisc->cpu_bstats;
+ miniqp->miniq1.cpu_qstats = qdisc->cpu_qstats;
+ miniqp->miniq2.cpu_bstats = qdisc->cpu_bstats;
+ miniqp->miniq2.cpu_qstats = qdisc->cpu_qstats;
+ miniqp->p_miniq = p_miniq;
+}
+EXPORT_SYMBOL(mini_qdisc_pair_init);