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Date: Thu, 03 Jul 2008 00:04:27 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
CC: vinay@...ux.vnet.ibm.com, krkumar2@...ibm.com, mchan@...adcom.com,
Matheos.Worku@....COM, linux-wireless@...r.kernel.org
Subject: [PATCH 22/39]: netdev: Move atomic queue state bits into
netdev_queue.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
include/linux/netdevice.h | 55 +++++++++++++++++++++++++++++++-------------
include/net/pkt_sched.h | 2 +-
net/sched/sch_generic.c | 20 +++++++++-------
3 files changed, 51 insertions(+), 26 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index d43bfc6..89bab7e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -281,14 +281,12 @@ struct header_ops {
enum netdev_state_t
{
- __LINK_STATE_XOFF=0,
__LINK_STATE_START,
__LINK_STATE_PRESENT,
__LINK_STATE_SCHED,
__LINK_STATE_NOCARRIER,
__LINK_STATE_LINKWATCH_PENDING,
__LINK_STATE_DORMANT,
- __LINK_STATE_QDISC_RUNNING,
};
@@ -448,10 +446,17 @@ static inline void napi_synchronize(const struct napi_struct *n)
# define napi_synchronize(n) barrier()
#endif
+enum netdev_queue_state_t
+{
+ __QUEUE_STATE_XOFF,
+ __QUEUE_STATE_QDISC_RUNNING,
+};
+
struct netdev_queue {
spinlock_t lock;
struct net_device *dev;
struct Qdisc *qdisc;
+ unsigned long state;
struct sk_buff *gso_skb;
spinlock_t _xmit_lock;
int xmit_lock_owner;
@@ -950,9 +955,7 @@ extern void __netif_schedule(struct netdev_queue *dev_queue);
static inline void netif_schedule_queue(struct netdev_queue *dev_queue)
{
- struct net_device *dev = dev_queue->dev;
-
- if (!test_bit(__LINK_STATE_XOFF, &dev->state))
+ if (!test_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
__netif_schedule(dev_queue);
}
@@ -967,9 +970,14 @@ static inline void netif_schedule(struct net_device *dev)
*
* Allow upper layers to call the device hard_start_xmit routine.
*/
+static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
+{
+ clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
+}
+
static inline void netif_start_queue(struct net_device *dev)
{
- clear_bit(__LINK_STATE_XOFF, &dev->state);
+ netif_tx_start_queue(&dev->tx_queue);
}
/**
@@ -979,16 +987,21 @@ static inline void netif_start_queue(struct net_device *dev)
* Allow upper layers to call the device hard_start_xmit routine.
* Used for flow control when transmit resources are available.
*/
-static inline void netif_wake_queue(struct net_device *dev)
+static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
{
#ifdef CONFIG_NETPOLL_TRAP
if (netpoll_trap()) {
- clear_bit(__LINK_STATE_XOFF, &dev->state);
+ clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
return;
}
#endif
- if (test_and_clear_bit(__LINK_STATE_XOFF, &dev->state))
- __netif_schedule(&dev->tx_queue);
+ if (test_and_clear_bit(__QUEUE_STATE_XOFF, &dev_queue->state))
+ __netif_schedule(dev_queue);
+}
+
+static inline void netif_wake_queue(struct net_device *dev)
+{
+ netif_tx_wake_queue(&dev->tx_queue);
}
/**
@@ -998,9 +1011,14 @@ static inline void netif_wake_queue(struct net_device *dev)
* Stop upper layers calling the device hard_start_xmit routine.
* Used for flow control when transmit resources are unavailable.
*/
+static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
+{
+ set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
+}
+
static inline void netif_stop_queue(struct net_device *dev)
{
- set_bit(__LINK_STATE_XOFF, &dev->state);
+ netif_tx_stop_queue(&dev->tx_queue);
}
/**
@@ -1009,9 +1027,14 @@ static inline void netif_stop_queue(struct net_device *dev)
*
* Test if transmit queue on device is currently unable to send.
*/
+static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
+{
+ return test_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
+}
+
static inline int netif_queue_stopped(const struct net_device *dev)
{
- return test_bit(__LINK_STATE_XOFF, &dev->state);
+ return netif_tx_queue_stopped(&dev->tx_queue);
}
/**
@@ -1041,7 +1064,7 @@ static inline int netif_running(const struct net_device *dev)
*/
static inline void netif_start_subqueue(struct net_device *dev, u16 queue_index)
{
- clear_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
+ clear_bit(__QUEUE_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
}
/**
@@ -1057,7 +1080,7 @@ static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
if (netpoll_trap())
return;
#endif
- set_bit(__LINK_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
+ set_bit(__QUEUE_STATE_XOFF, &dev->egress_subqueue[queue_index].state);
}
/**
@@ -1070,7 +1093,7 @@ static inline void netif_stop_subqueue(struct net_device *dev, u16 queue_index)
static inline int __netif_subqueue_stopped(const struct net_device *dev,
u16 queue_index)
{
- return test_bit(__LINK_STATE_XOFF,
+ return test_bit(__QUEUE_STATE_XOFF,
&dev->egress_subqueue[queue_index].state);
}
@@ -1093,7 +1116,7 @@ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
if (netpoll_trap())
return;
#endif
- if (test_and_clear_bit(__LINK_STATE_XOFF,
+ if (test_and_clear_bit(__QUEUE_STATE_XOFF,
&dev->egress_subqueue[queue_index].state))
__netif_schedule(&dev->tx_queue);
}
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 554d6c9..1e2263c 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -87,7 +87,7 @@ static inline void qdisc_run(struct netdev_queue *dev_queue)
struct net_device *dev = dev_queue->dev;
if (!netif_queue_stopped(dev) &&
- !test_and_set_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
+ !test_and_set_bit(__QUEUE_STATE_QDISC_RUNNING, &dev_queue->state))
__qdisc_run(dev_queue);
}
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 00f4e3e..b919c0b 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -121,9 +121,9 @@ static inline int handle_dev_cpu_collision(struct sk_buff *skb,
/*
* NOTE: Called under queue->lock with locally disabled BH.
*
- * __LINK_STATE_QDISC_RUNNING guarantees only one CPU can process this
- * device at a time. queue->lock serializes queue accesses for
- * this device AND dev_queue->qdisc pointer itself.
+ * __QUEUE_STATE_QDISC_RUNNING guarantees only one CPU can process
+ * this queue at a time. queue->lock serializes queue accesses for
+ * this queue AND dev_queue->qdisc pointer itself.
*
* netif_tx_lock serializes accesses to device driver.
*
@@ -206,7 +206,7 @@ void __qdisc_run(struct netdev_queue *dev_queue)
}
}
- clear_bit(__LINK_STATE_QDISC_RUNNING, &dev->state);
+ clear_bit(__QUEUE_STATE_QDISC_RUNNING, &dev_queue->state);
}
static void dev_watchdog(unsigned long arg)
@@ -605,9 +605,10 @@ static void dev_deactivate_queue(struct netdev_queue *dev_queue,
void dev_deactivate(struct net_device *dev)
{
+ struct netdev_queue *dev_queue = &dev->tx_queue;
int running;
- dev_deactivate_queue(&dev->tx_queue, &noop_qdisc);
+ dev_deactivate_queue(dev_queue, &noop_qdisc);
dev_watchdog_down(dev);
@@ -616,16 +617,17 @@ void dev_deactivate(struct net_device *dev)
/* Wait for outstanding qdisc_run calls. */
do {
- while (test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state))
+ while (test_bit(__QUEUE_STATE_QDISC_RUNNING, &dev_queue->state))
yield();
/*
* Double-check inside queue lock to ensure that all effects
* of the queue run are visible when we return.
*/
- spin_lock_bh(&dev->tx_queue.lock);
- running = test_bit(__LINK_STATE_QDISC_RUNNING, &dev->state);
- spin_unlock_bh(&dev->tx_queue.lock);
+ spin_lock_bh(&dev_queue->lock);
+ running = test_bit(__QUEUE_STATE_QDISC_RUNNING,
+ &dev_queue->state);
+ spin_unlock_bh(&dev_queue->lock);
/*
* The running flag should never be set at this point because
--
1.5.6
--
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