AcoSail/kernel_optimize_test
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Phonet: get rid of deferred work on the transmission path

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Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont 2008-12-17 15:48:50 -08:00 committed by David S. Miller
parent be677730a0
commit 893873f396
1 changed files with 28 additions and 63 deletions
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91
net/phonet/pep-gprs.c
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@ -41,11 +41,6 @@ struct gprs_dev {
void (*old_write_space)(struct sock *);
struct net_device *dev;
struct sk_buff_head tx_queue;
struct work_struct tx_work;
spinlock_t tx_lock;
unsigned tx_max;
};
static __be16 gprs_type_trans(struct sk_buff *skb)
@ -66,6 +61,14 @@ static __be16 gprs_type_trans(struct sk_buff *skb)
return htons(0);
}
static void gprs_writeable(struct gprs_dev *gp)
{
struct net_device *dev = gp->dev;
if (pep_writeable(gp->sk))
netif_wake_queue(dev);
}
/*
* Socket callbacks
*/
@ -157,14 +160,9 @@ static void gprs_data_ready(struct sock *sk, int len)
static void gprs_write_space(struct sock *sk)
{
struct gprs_dev *gp = sk->sk_user_data;
struct net_device *dev = gp->dev;
unsigned credits = pep_writeable(sk);
spin_lock_bh(&gp->tx_lock);
gp->tx_max = credits;
if (credits > skb_queue_len(&gp->tx_queue) && netif_running(dev))
netif_wake_queue(dev);
spin_unlock_bh(&gp->tx_lock);
if (netif_running(gp->dev))
gprs_writeable(gp);
}
/*
@ -175,22 +173,21 @@ static int gprs_open(struct net_device *dev)
{
struct gprs_dev *gp = netdev_priv(dev);
gprs_write_space(gp->sk);
gprs_writeable(gp);
return 0;
}
static int gprs_close(struct net_device *dev)
{
struct gprs_dev *gp = netdev_priv(dev);
netif_stop_queue(dev);
flush_work(&gp->tx_work);
return 0;
}
static int gprs_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct gprs_dev *gp = netdev_priv(dev);
struct sock *sk = gp->sk;
int len, err;
switch (skb->protocol) {
case htons(ETH_P_IP):
@ -201,51 +198,24 @@ static int gprs_xmit(struct sk_buff *skb, struct net_device *dev)
return 0;
}
spin_lock(&gp->tx_lock);
if (likely(skb_queue_len(&gp->tx_queue) < gp->tx_max)) {
skb_queue_tail(&gp->tx_queue, skb);
skb = NULL;
}
if (skb_queue_len(&gp->tx_queue) >= gp->tx_max)
netif_stop_queue(dev);
spin_unlock(&gp->tx_lock);
schedule_work(&gp->tx_work);
if (unlikely(skb))
skb_orphan(skb);
skb_set_owner_w(skb, sk);
len = skb->len;
err = pep_write(sk, skb);
if (err) {
LIMIT_NETDEBUG(KERN_WARNING"%s: TX error (%d)\n",
dev->name, err);
dev->stats.tx_aborted_errors++;
dev->stats.tx_errors++;
dev_kfree_skb(skb);
return 0;
}
static void gprs_tx(struct work_struct *work)
{
struct gprs_dev *gp = container_of(work, struct gprs_dev, tx_work);
struct net_device *dev = gp->dev;
struct sock *sk = gp->sk;
struct sk_buff *skb;
while ((skb = skb_dequeue(&gp->tx_queue)) != NULL) {
int err;
dev->stats.tx_bytes += skb->len;
} else {
dev->stats.tx_packets++;
skb_orphan(skb);
skb_set_owner_w(skb, sk);
lock_sock(sk);
err = pep_write(sk, skb);
if (err) {
LIMIT_NETDEBUG(KERN_WARNING"%s: TX error (%d)\n",
dev->name, err);
dev->stats.tx_aborted_errors++;
dev->stats.tx_errors++;
}
release_sock(sk);
dev->stats.tx_bytes += len;
}
lock_sock(sk);
gprs_write_space(sk);
release_sock(sk);
if (!pep_writeable(sk))
netif_stop_queue(dev);
return 0;
}
static int gprs_set_mtu(struct net_device *dev, int new_mtu)
@ -297,11 +267,8 @@ int gprs_attach(struct sock *sk)
if (!dev)
return -ENOMEM;
gp = netdev_priv(dev);
gp->sk = sk;
gp->dev = dev;
gp->tx_max = 0;
spin_lock_init(&gp->tx_lock);
skb_queue_head_init(&gp->tx_queue);
INIT_WORK(&gp->tx_work, gprs_tx);
netif_stop_queue(dev);
err = register_netdev(dev);
@ -328,9 +295,7 @@ int gprs_attach(struct sock *sk)
sk->sk_data_ready = gprs_data_ready;
sk->sk_write_space = gprs_write_space;
release_sock(sk);
sock_hold(sk);
gp->sk = sk;
printk(KERN_DEBUG"%s: attached\n", dev->name);
return dev->ifindex;