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Date: Thu, 17 Jul 2008 05:18:12 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
CC: kaber@...sh.net, johannes@...solutions.net,
linux-wireless@...r.kernel.org
Subject: [PATCH 28/31]: pkt_sched: Kill netdev_queue lock.
We can simply use the qdisc->q.lock for all of the
qdisc tree synchronization.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
drivers/net/ifb.c | 20 --------------------
include/linux/netdevice.h | 1 -
include/net/sch_generic.h | 7 ++++++-
net/core/dev.c | 9 +++++----
net/mac80211/wme.c | 19 ++++++++++++-------
net/sched/sch_generic.c | 32 +++++++++++++++-----------------
net/sched/sch_teql.c | 7 +++++--
7 files changed, 43 insertions(+), 52 deletions(-)
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 897b05e..0960e69 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -35,7 +35,6 @@
#include <linux/moduleparam.h>
#include <net/pkt_sched.h>
#include <net/net_namespace.h>
-#include <linux/lockdep.h>
#define TX_TIMEOUT (2*HZ)
@@ -228,22 +227,6 @@ static struct rtnl_link_ops ifb_link_ops __read_mostly = {
module_param(numifbs, int, 0);
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
-/*
- * dev_ifb's TX queue lock is usually taken after dev->rx_queue.lock,
- * reversely to e.g. qdisc_lock_tree(). It should be safe until
- * ifb doesn't take dev's TX queue lock with dev_ifb->rx_queue.lock.
- * But lockdep should know that ifb has different locks from dev.
- */
-static struct lock_class_key ifb_tx_queue_lock_key;
-static struct lock_class_key ifb_rx_queue_lock_key;
-
-static void set_tx_lockdep_key(struct net_device *dev,
- struct netdev_queue *txq,
- void *_unused)
-{
- lockdep_set_class(&txq->lock, &ifb_tx_queue_lock_key);
-}
-
static int __init ifb_init_one(int index)
{
struct net_device *dev_ifb;
@@ -264,9 +247,6 @@ static int __init ifb_init_one(int index)
if (err < 0)
goto err;
- netdev_for_each_tx_queue(dev_ifb, set_tx_lockdep_key, NULL);
- lockdep_set_class(&dev_ifb->rx_queue.lock, &ifb_rx_queue_lock_key);
-
return 0;
err:
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 3170bce..9c5a688 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -443,7 +443,6 @@ enum netdev_queue_state_t
};
struct netdev_queue {
- spinlock_t lock;
struct net_device *dev;
struct Qdisc *qdisc;
unsigned long state;
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 1eef8d0..2902a42 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -163,6 +163,11 @@ struct tcf_proto
struct tcf_proto_ops *ops;
};
+static inline spinlock_t *qdisc_lock(struct Qdisc *qdisc)
+{
+ return &qdisc->q.lock;
+}
+
static inline struct Qdisc *qdisc_root(struct Qdisc *qdisc)
{
return qdisc->dev_queue->qdisc;
@@ -172,7 +177,7 @@ static inline spinlock_t *qdisc_root_lock(struct Qdisc *qdisc)
{
struct Qdisc *root = qdisc_root(qdisc);
- return &root->dev_queue->lock;
+ return qdisc_lock(root);
}
static inline struct net_device *qdisc_dev(struct Qdisc *qdisc)
diff --git a/net/core/dev.c b/net/core/dev.c
index 6741e34..32a1377 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2080,10 +2080,12 @@ static int ing_filter(struct sk_buff *skb)
rxq = &dev->rx_queue;
- spin_lock(&rxq->lock);
- if ((q = rxq->qdisc) != NULL)
+ q = rxq->qdisc;
+ if (q) {
+ spin_lock(qdisc_lock(q));
result = q->enqueue(skb, q);
- spin_unlock(&rxq->lock);
+ spin_unlock(qdisc_lock(q));
+ }
return result;
}
@@ -4173,7 +4175,6 @@ static void netdev_init_one_queue(struct net_device *dev,
struct netdev_queue *queue,
void *_unused)
{
- spin_lock_init(&queue->lock);
queue->dev = dev;
}
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index b21cfec..6e8099e 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -237,12 +237,14 @@ void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
ieee80211_requeue(local, agg_queue);
} else {
struct netdev_queue *txq;
+ spinlock_t *root_lock;
txq = netdev_get_tx_queue(local->mdev, agg_queue);
+ root_lock = qdisc_root_lock(txq->qdisc);
- spin_lock_bh(&txq->lock);
+ spin_lock_bh(root_lock);
qdisc_reset(txq->qdisc);
- spin_unlock_bh(&txq->lock);
+ spin_unlock_bh(root_lock);
}
}
@@ -250,6 +252,7 @@ void ieee80211_requeue(struct ieee80211_local *local, int queue)
{
struct netdev_queue *txq = netdev_get_tx_queue(local->mdev, queue);
struct sk_buff_head list;
+ spinlock_t *root_lock;
struct Qdisc *qdisc;
u32 len;
@@ -261,14 +264,15 @@ void ieee80211_requeue(struct ieee80211_local *local, int queue)
skb_queue_head_init(&list);
- spin_lock(&txq->lock);
+ root_lock = qdisc_root_lock(qdisc);
+ spin_lock(root_lock);
for (len = qdisc->q.qlen; len > 0; len--) {
struct sk_buff *skb = qdisc->dequeue(qdisc);
if (skb)
__skb_queue_tail(&list, skb);
}
- spin_unlock(&txq->lock);
+ spin_unlock(root_lock);
for (len = list.qlen; len > 0; len--) {
struct sk_buff *skb = __skb_dequeue(&list);
@@ -280,12 +284,13 @@ void ieee80211_requeue(struct ieee80211_local *local, int queue)
txq = netdev_get_tx_queue(local->mdev, new_queue);
- spin_lock(&txq->lock);
qdisc = rcu_dereference(txq->qdisc);
- qdisc->enqueue(skb, qdisc);
+ root_lock = qdisc_root_lock(qdisc);
- spin_unlock(&txq->lock);
+ spin_lock(root_lock);
+ qdisc->enqueue(skb, qdisc);
+ spin_unlock(root_lock);
}
out_unlock:
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 3d53e92..8fc580b 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -96,15 +96,15 @@ static inline int handle_dev_cpu_collision(struct sk_buff *skb,
}
/*
- * NOTE: Called under queue->lock with locally disabled BH.
+ * NOTE: Called under qdisc_lock(q) with locally disabled BH.
*
* __QDISC_STATE_RUNNING guarantees only one CPU can process
- * this qdisc at a time. queue->lock serializes queue accesses for
- * this queue AND txq->qdisc pointer itself.
+ * this qdisc at a time. qdisc_lock(q) serializes queue accesses for
+ * this queue.
*
* netif_tx_lock serializes accesses to device driver.
*
- * queue->lock and netif_tx_lock are mutually exclusive,
+ * qdisc_lock(q) and netif_tx_lock are mutually exclusive,
* if one is grabbed, another must be free.
*
* Note, that this procedure can be called by a watchdog timer
@@ -317,7 +317,6 @@ struct Qdisc_ops noop_qdisc_ops __read_mostly = {
};
static struct netdev_queue noop_netdev_queue = {
- .lock = __SPIN_LOCK_UNLOCKED(noop_netdev_queue.lock),
.qdisc = &noop_qdisc,
};
@@ -327,6 +326,7 @@ struct Qdisc noop_qdisc = {
.flags = TCQ_F_BUILTIN,
.ops = &noop_qdisc_ops,
.list = LIST_HEAD_INIT(noop_qdisc.list),
+ .q.lock = __SPIN_LOCK_UNLOCKED(noop_qdisc.q.lock),
.dev_queue = &noop_netdev_queue,
};
EXPORT_SYMBOL(noop_qdisc);
@@ -498,7 +498,7 @@ errout:
}
EXPORT_SYMBOL(qdisc_create_dflt);
-/* Under queue->lock and BH! */
+/* Under qdisc_root_lock(qdisc) and BH! */
void qdisc_reset(struct Qdisc *qdisc)
{
@@ -526,10 +526,12 @@ static void __qdisc_destroy(struct rcu_head *head)
module_put(ops->owner);
dev_put(qdisc_dev(qdisc));
+ kfree_skb(qdisc->gso_skb);
+
kfree((char *) qdisc - qdisc->padded);
}
-/* Under queue->lock and BH! */
+/* Under qdisc_root_lock(qdisc) and BH! */
void qdisc_destroy(struct Qdisc *qdisc)
{
@@ -586,13 +588,12 @@ static void transition_one_qdisc(struct net_device *dev,
struct netdev_queue *dev_queue,
void *_need_watchdog)
{
+ struct Qdisc *new_qdisc = dev_queue->qdisc_sleeping;
int *need_watchdog_p = _need_watchdog;
- spin_lock_bh(&dev_queue->lock);
- rcu_assign_pointer(dev_queue->qdisc, dev_queue->qdisc_sleeping);
- if (dev_queue->qdisc != &noqueue_qdisc)
+ rcu_assign_pointer(dev_queue->qdisc, new_qdisc);
+ if (new_qdisc != &noqueue_qdisc)
*need_watchdog_p = 1;
- spin_unlock_bh(&dev_queue->lock);
}
void dev_activate(struct net_device *dev)
@@ -629,19 +630,16 @@ static void dev_deactivate_queue(struct net_device *dev,
struct sk_buff *skb = NULL;
struct Qdisc *qdisc;
- spin_lock_bh(&dev_queue->lock);
-
qdisc = dev_queue->qdisc;
if (qdisc) {
+ spin_lock_bh(qdisc_lock(qdisc));
+
dev_queue->qdisc = qdisc_default;
qdisc_reset(qdisc);
- skb = qdisc->gso_skb;
- qdisc->gso_skb = NULL;
+ spin_unlock_bh(qdisc_lock(qdisc));
}
- spin_unlock_bh(&dev_queue->lock);
-
kfree_skb(skb);
}
diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
index ade3372..8b0ff34 100644
--- a/net/sched/sch_teql.c
+++ b/net/sched/sch_teql.c
@@ -156,12 +156,15 @@ teql_destroy(struct Qdisc* sch)
master->slaves = NEXT_SLAVE(q);
if (q == master->slaves) {
struct netdev_queue *txq;
+ spinlock_t *root_lock;
txq = netdev_get_tx_queue(master->dev, 0);
master->slaves = NULL;
- spin_lock_bh(&txq->lock);
+
+ root_lock = qdisc_root_lock(txq->qdisc);
+ spin_lock_bh(root_lock);
qdisc_reset(txq->qdisc);
- spin_unlock_bh(&txq->lock);
+ spin_unlock_bh(root_lock);
}
}
skb_queue_purge(&dat->q);
--
1.5.6.2.255.gbed62
--
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