include/linux/netpoll.h

   1 /*
   2  * Common code for low-level network console, dump, and debugger code
   3  *
   4  * Derived from netconsole, kgdb-over-ethernet, and netdump patches
   5  */
   6
   7 #ifndef _LINUX_NETPOLL_H
   8 #define _LINUX_NETPOLL_H
   9
  10 #include <linux/netdevice.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/list.h>
  13
  14 struct netpoll;
  15
  16 struct netpoll {
  17         struct net_device *dev;
  18         char dev_name[16], *name;
  19         void (*rx_hook)(struct netpoll *, int, char *, int);
  20         void (*drop)(struct sk_buff *skb);
  21         u32 local_ip, remote_ip;
  22         u16 local_port, remote_port;
  23         unsigned char local_mac[6], remote_mac[6];
  24 };
  25
  26 struct netpoll_info {
  27         spinlock_t poll_lock;
  28         int poll_owner;
  29         int rx_flags;
  30         spinlock_t rx_lock;
  31         struct netpoll *rx_np; /* netpoll that registered an rx_hook */
  32 };
  33
  34 void netpoll_poll(struct netpoll *np);
  35 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  36 int netpoll_parse_options(struct netpoll *np, char *opt);
  37 int netpoll_setup(struct netpoll *np);
  38 int netpoll_trap(void);
  39 void netpoll_set_trap(int trap);
  40 void netpoll_cleanup(struct netpoll *np);
  41 int __netpoll_rx(struct sk_buff *skb);
  42 void netpoll_queue(struct sk_buff *skb);
  43
  44 #ifdef CONFIG_NETPOLL
  45 static inline int netpoll_rx(struct sk_buff *skb)
  46 {
  47         struct netpoll_info *npinfo = skb->dev->npinfo;
  48         unsigned long flags;
  49         int ret = 0;
  50
  51         if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
  52                 return 0;
  53
  54         spin_lock_irqsave(&npinfo->rx_lock, flags);
  55         /* check rx_flags again with the lock held */
  56         if (npinfo->rx_flags && __netpoll_rx(skb))
  57                 ret = 1;
  58         spin_unlock_irqrestore(&npinfo->rx_lock, flags);
  59
  60         return ret;
  61 }
  62
  63 static inline void netpoll_poll_lock(struct net_device *dev)
  64 {
  65         if (dev->npinfo) {
  66                 spin_lock(&dev->npinfo->poll_lock);
  67                 dev->npinfo->poll_owner = smp_processor_id();
  68         }
  69 }
  70
  71 static inline void netpoll_poll_unlock(struct net_device *dev)
  72 {
  73         if (dev->npinfo) {
  74                 dev->npinfo->poll_owner = -1;
  75                 spin_unlock(&dev->npinfo->poll_lock);
  76         }
  77 }
  78
  79 #else
  80 #define netpoll_rx(a) 0
  81 #define netpoll_poll_lock(a)
  82 #define netpoll_poll_unlock(a)
  83 #endif
  84
  85 #endif