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mv643xx_eth: transmit multiqueue support

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As all the infrastructure for multiple transmit queues already exists
in the driver, this patch is entirely trivial.

The individual transmit queues are still serialised by the driver's
per-port private spinlock, but that will disappear (i.e. be replaced
by the per-subqueue ->_xmit_lock) in a subsequent patch.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
This commit is contained in:
Lennert Buytenhek 2008-08-28 06:26:23 +02:00 committed by Lennert Buytenhek
parent befefe2177
commit e5ef1de198
1 changed files with 18 additions and 22 deletions
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40
drivers/net/mv643xx_eth.c
View file

@ -449,15 +449,10 @@ static void txq_disable(struct tx_queue *txq)
static void __txq_maybe_wake(struct tx_queue *txq)
{
struct mv643xx_eth_private *mp = txq_to_mp(txq);
/*
* netif_{stop,wake}_queue() flow control only applies to
* the primary queue.
*/
BUG_ON(txq->index != 0);
struct netdev_queue *nq = netdev_get_tx_queue(mp->dev, txq->index);
if (txq->tx_ring_size - txq->tx_desc_count >= MAX_SKB_FRAGS + 1)
netif_wake_queue(mp->dev);
netif_tx_wake_queue(nq);
}
@ -827,8 +822,11 @@ static int mv643xx_eth_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mv643xx_eth_private *mp = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
int queue;
struct tx_queue *txq;
struct netdev_queue *nq;
unsigned long flags;
int entries_left;
if (has_tiny_unaligned_frags(skb) && __skb_linearize(skb)) {
stats->tx_dropped++;
@ -838,15 +836,16 @@ static int mv643xx_eth_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_BUSY;
}
spin_lock_irqsave(&mp->lock, flags);
queue = skb_get_queue_mapping(skb);
txq = mp->txq + queue;
nq = netdev_get_tx_queue(dev, queue);
txq = mp->txq;
spin_lock_irqsave(&mp->lock, flags);
if (txq->tx_ring_size - txq->tx_desc_count < MAX_SKB_FRAGS + 1) {
spin_unlock_irqrestore(&mp->lock, flags);
if (txq->index == 0 && net_ratelimit())
dev_printk(KERN_ERR, &dev->dev,
"primary tx queue full?!\n");
if (net_ratelimit())
dev_printk(KERN_ERR, &dev->dev, "tx queue full?!\n");
kfree_skb(skb);
return NETDEV_TX_OK;
}
@ -856,13 +855,9 @@ static int mv643xx_eth_xmit(struct sk_buff *skb, struct net_device *dev)
stats->tx_packets++;
dev->trans_start = jiffies;
if (txq->index == 0) {
int entries_left;
entries_left = txq->tx_ring_size - txq->tx_desc_count;
if (entries_left < MAX_SKB_FRAGS + 1)
netif_stop_queue(dev);
}
entries_left = txq->tx_ring_size - txq->tx_desc_count;
if (entries_left < MAX_SKB_FRAGS + 1)
netif_tx_stop_queue(nq);
spin_unlock_irqrestore(&mp->lock, flags);
@ -2169,10 +2164,10 @@ static void tx_timeout_task(struct work_struct *ugly)
mp = container_of(ugly, struct mv643xx_eth_private, tx_timeout_task);
if (netif_running(mp->dev)) {
netif_stop_queue(mp->dev);
netif_tx_stop_all_queues(mp->dev);
port_reset(mp);
port_start(mp);
netif_wake_queue(mp->dev);
netif_tx_wake_all_queues(mp->dev);
}
}
@ -2546,7 +2541,7 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
return -ENODEV;
}
dev = alloc_etherdev(sizeof(struct mv643xx_eth_private));
dev = alloc_etherdev_mq(sizeof(struct mv643xx_eth_private), 8);
if (!dev)
return -ENOMEM;
@ -2559,6 +2554,7 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
mp->dev = dev;
set_params(mp, pd);
dev->real_num_tx_queues = mp->txq_count;
spin_lock_init(&mp->lock);