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netdev: Allocate multiple queues for TX.

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alloc_netdev_mq() now allocates an array of netdev_queue
structures for TX, based upon the queue_count argument.

Furthermore, all accesses to the TX queues are now vectored
through the netdev_get_tx_queue() and netdev_for_each_tx_queue()
interfaces.  This makes it easy to grep the tree for all
things that want to get to a TX queue of a net device.

Problem spots which are not really multiqueue aware yet, and
only work with one queue, can easily be spotted by grepping
for all netdev_get_tx_queue() calls that pass in a zero index.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2008-07-17 00:34:19 -07:00
parent 070825b384
commit e8a0464cc9
18 changed files with 320 additions and 137 deletions
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69
include/linux/netdevice.h
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@@ -463,7 +463,7 @@ struct netdev_queue {
struct Qdisc *qdisc_sleeping;
struct list_head qdisc_list;
struct netdev_queue *next_sched;
};
} ____cacheline_aligned_in_smp;
/*
* The DEVICE structure.
@@ -641,7 +641,9 @@ struct net_device
unsigned char broadcast[MAX_ADDR_LEN]; /* hw bcast add */
struct netdev_queue rx_queue;
struct netdev_queue tx_queue ____cacheline_aligned_in_smp;
struct netdev_queue *_tx ____cacheline_aligned_in_smp;
unsigned int num_tx_queues;
unsigned long tx_queue_len; /* Max frames per queue allowed */
/*
@@ -764,6 +766,25 @@ struct net_device
#define NETDEV_ALIGN 32
#define NETDEV_ALIGN_CONST (NETDEV_ALIGN - 1)
static inline
struct netdev_queue *netdev_get_tx_queue(const struct net_device *dev,
unsigned int index)
{
return &dev->_tx[index];
}
static inline void netdev_for_each_tx_queue(struct net_device *dev,
void (*f)(struct net_device *,
struct netdev_queue *,
void *),
void *arg)
{
unsigned int i;
for (i = 0; i < dev->num_tx_queues; i++)
f(dev, &dev->_tx[i], arg);
}
/*
* Net namespace inlines
*/
@@ -977,7 +998,7 @@ static inline void netif_schedule_queue(struct netdev_queue *txq)
static inline void netif_schedule(struct net_device *dev)
{
netif_schedule_queue(&dev->tx_queue);
netif_schedule_queue(netdev_get_tx_queue(dev, 0));
}
/**
@@ -993,7 +1014,7 @@ static inline void netif_tx_start_queue(struct netdev_queue *dev_queue)
static inline void netif_start_queue(struct net_device *dev)
{
netif_tx_start_queue(&dev->tx_queue);
netif_tx_start_queue(netdev_get_tx_queue(dev, 0));
}
/**
@@ -1017,7 +1038,7 @@ static inline void netif_tx_wake_queue(struct netdev_queue *dev_queue)
static inline void netif_wake_queue(struct net_device *dev)
{
netif_tx_wake_queue(&dev->tx_queue);
netif_tx_wake_queue(netdev_get_tx_queue(dev, 0));
}
/**
@@ -1034,7 +1055,7 @@ static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
static inline void netif_stop_queue(struct net_device *dev)
{
netif_tx_stop_queue(&dev->tx_queue);
netif_tx_stop_queue(netdev_get_tx_queue(dev, 0));
}
/**
@@ -1050,7 +1071,7 @@ static inline int netif_tx_queue_stopped(const struct netdev_queue *dev_queue)
static inline int netif_queue_stopped(const struct net_device *dev)
{
return netif_tx_queue_stopped(&dev->tx_queue);
return netif_tx_queue_stopped(netdev_get_tx_queue(dev, 0));
}
/**
@@ -1134,7 +1155,7 @@ static inline void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
#endif
if (test_and_clear_bit(__QUEUE_STATE_XOFF,
&dev->egress_subqueue[queue_index].state))
__netif_schedule(&dev->tx_queue);
__netif_schedule(netdev_get_tx_queue(dev, 0));
}
/**
@@ -1430,18 +1451,19 @@ static inline void __netif_tx_lock(struct netdev_queue *txq, int cpu)
static inline void netif_tx_lock(struct net_device *dev)
{
__netif_tx_lock(&dev->tx_queue, smp_processor_id());
}
int cpu = smp_processor_id();
unsigned int i;
static inline void __netif_tx_lock_bh(struct netdev_queue *txq)
{
spin_lock_bh(&txq->_xmit_lock);
txq->xmit_lock_owner = smp_processor_id();
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
__netif_tx_lock(txq, cpu);
}
}
static inline void netif_tx_lock_bh(struct net_device *dev)
{
__netif_tx_lock_bh(&dev->tx_queue);
local_bh_disable();
netif_tx_lock(dev);
}
static inline int __netif_tx_trylock(struct netdev_queue *txq)
@@ -1454,7 +1476,7 @@ static inline int __netif_tx_trylock(struct netdev_queue *txq)
static inline int netif_tx_trylock(struct net_device *dev)
{
return __netif_tx_trylock(&dev->tx_queue);
return __netif_tx_trylock(netdev_get_tx_queue(dev, 0));
}
static inline void __netif_tx_unlock(struct netdev_queue *txq)
@@ -1465,18 +1487,19 @@ static inline void __netif_tx_unlock(struct netdev_queue *txq)
static inline void netif_tx_unlock(struct net_device *dev)
{
__netif_tx_unlock(&dev->tx_queue);
}
unsigned int i;
for (i = 0; i < dev->num_tx_queues; i++) {
struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
__netif_tx_unlock(txq);
}
static inline void __netif_tx_unlock_bh(struct netdev_queue *txq)
{
txq->xmit_lock_owner = -1;
spin_unlock_bh(&txq->_xmit_lock);
}
static inline void netif_tx_unlock_bh(struct net_device *dev)
{
__netif_tx_unlock_bh(&dev->tx_queue);
netif_tx_unlock(dev);
local_bh_enable();
}
#define HARD_TX_LOCK(dev, txq, cpu) { \