#define SHAPER_BANNER "CymruNet Traffic Shaper BETA 0.04 for Linux 2.1\n"
-/*
- * Locking
- */
-
-static int shaper_lock(struct shaper *sh)
-{
- /*
- * Lock in an interrupt must fail
- */
- while (test_and_set_bit(0, &sh->locked))
- {
- if (!in_interrupt())
- sleep_on(&sh->wait_queue);
- else
- return 0;
-
- }
- return 1;
-}
-
static void shaper_kick(struct shaper *sh);
-static void shaper_unlock(struct shaper *sh)
-{
- clear_bit(0, &sh->locked);
- wake_up(&sh->wait_queue);
- shaper_kick(sh);
-}
-
/*
* Compute clocks on a buffer
*/
* Throw a frame at a shaper.
*/
-static int shaper_qframe(struct shaper *shaper, struct sk_buff *skb)
+
+static int shaper_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
+ struct shaper *shaper = dev->priv;
struct sk_buff *ptr;
-
- /*
- * Get ready to work on this shaper. Lock may fail if its
- * an interrupt and locked.
- */
-
- if(!shaper_lock(shaper))
- return -1;
+
+ spin_lock(&shaper->lock);
ptr=shaper->sendq.prev;
/*
dev_kfree_skb(ptr);
shaper->stats.collisions++;
}
- shaper_unlock(shaper);
+ shaper_kick(shaper);
+ spin_unlock(&shaper->lock);
return 0;
}
static void shaper_timer(unsigned long data)
{
- struct shaper *sh=(struct shaper *)data;
- shaper_kick(sh);
+ struct shaper *shaper = (struct shaper *)data;
+
+ spin_lock(&shaper->lock);
+ shaper_kick(shaper);
+ spin_unlock(&shaper->lock);
}
/*
{
struct sk_buff *skb;
- /*
- * Shaper unlock will kick
- */
-
- if (test_and_set_bit(0, &shaper->locked))
- {
- if(sh_debug)
- printk("Shaper locked.\n");
- mod_timer(&shaper->timer, jiffies);
- return;
- }
-
-
/*
* Walk the list (may be empty)
*/
if(skb!=NULL)
mod_timer(&shaper->timer, SHAPERCB(skb)->shapeclock);
-
- clear_bit(0, &shaper->locked);
}
-/*
- * Flush the shaper queues on a closedown
- */
-
-static void shaper_flush(struct shaper *shaper)
-{
- struct sk_buff *skb;
- if(!shaper_lock(shaper))
- {
- printk(KERN_ERR "shaper: shaper_flush() called by an irq!\n");
- return;
- }
- while((skb=skb_dequeue(&shaper->sendq))!=NULL)
- dev_kfree_skb(skb);
- shaper_unlock(shaper);
-}
-
/*
* Bring the interface up. We just disallow this until a
* bind.
static int shaper_close(struct net_device *dev)
{
struct shaper *shaper=dev->priv;
- shaper_flush(shaper);
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(&shaper->sendq)) != NULL)
+ dev_kfree_skb(skb);
+
+ spin_lock_bh(&shaper->lock);
+ shaper_kick(shaper);
+ spin_unlock_bh(&shaper->lock);
+
del_timer_sync(&shaper->timer);
return 0;
}
* ARP and other resolutions and not before.
*/
-
-static int shaper_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct shaper *sh=dev->priv;
- return shaper_qframe(sh, skb);
-}
-
static struct net_device_stats *shaper_get_stats(struct net_device *dev)
{
struct shaper *sh=dev->priv;
init_timer(&sh->timer);
sh->timer.function=shaper_timer;
sh->timer.data=(unsigned long)sh;
- init_waitqueue_head(&sh->wait_queue);
+ spin_lock_init(&sh->lock);
}
/*