static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
{
int count = 0;
struct sk_buff *skb;
zap_completion_queue();
refill_skbs();
repeat:
skb = alloc_skb(len, GFP_ATOMIC);
if (!skb)
skb = skb_dequeue(&skb_pool);
if (!skb) {
if (++count < 10) {
netpoll_poll(np);
goto repeat;
}
return NULL;
}
atomic_set(&skb->users, 1);
skb_reserve(skb, reserve);
return skb;
}
void netpoll_poll(struct netpoll *np)
{
if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller)
return;
/* Process pending work on NIC */
np->dev->poll_controller(np->dev);
if (np->dev->poll)
poll_napi(np);
service_arp_queue(np->dev->npinfo);
zap_completion_queue();
}
static struct sk_buff * find_skb(struct netpoll *np, int len, int reserve)
{
int once = 1, count = 0;
unsigned long flags;
struct sk_buff *skb = NULL;
zap_completion_queue();
repeat:
if (nr_skbs < MAX_SKBS)
refill_skbs();
skb = alloc_skb(len, GFP_ATOMIC);
if (!skb) {
spin_lock_irqsave(&skb_list_lock, flags);
skb = skbs;
if (skb) {
skbs = skb->next;
skb->next = NULL;
nr_skbs--;
}
spin_unlock_irqrestore(&skb_list_lock, flags);
}
if(!skb) {
count++;
if (once && (count == 1000000)) {
printk("out of netpoll skbs!\n");
once = 0;
}
netpoll_poll(np);
goto repeat;
}
atomic_set(&skb->users, 1);
skb_reserve(skb, reserve);
return skb;
}
void netpoll_poll_dev(struct net_device *dev)
{
if (!dev || !netif_running(dev))
return;
if (dev->poll_controller)
return;
dev->poll_controller(dev);
if (dev->poll) {
if (dev->npinfo->poll_owner != smp_processor_id() &&
spin_trylock(&dev->npinfo->poll_lock)) {
poll_one_napi(dev->npinfo, dev, 16);
spin_unlock(&dev->npinfo->poll_lock);
}
}
service_arp_queue(dev->npinfo);
zap_completion_queue();
}
