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/rcupdate.h> 13 #include <linux/list.h> 14 15 struct netpoll { 16 struct net_device *dev; 17 char dev_name[IFNAMSIZ]; 18 const char *name; 19 void (*rx_hook)(struct netpoll *, int, char *, int); 20 21 u32 local_ip, remote_ip; 22 u16 local_port, remote_port; 23 u8 local_mac[ETH_ALEN], remote_mac[ETH_ALEN]; 24 }; 25 26 struct netpoll_info { 27 atomic_t refcnt; 28 spinlock_t poll_lock; 29 int poll_owner; 30 int rx_flags; 31 spinlock_t rx_lock; 32 struct netpoll *rx_np; /* netpoll that registered an rx_hook */ 33 struct sk_buff_head arp_tx; /* list of arp requests to reply to */ 34 struct sk_buff_head txq; 35 struct delayed_work tx_work; 36 }; 37 38 void netpoll_poll(struct netpoll *np); 39 void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 40 int netpoll_parse_options(struct netpoll *np, char *opt); 41 int netpoll_setup(struct netpoll *np); 42 int netpoll_trap(void); 43 void netpoll_set_trap(int trap); 44 void netpoll_cleanup(struct netpoll *np); 45 int __netpoll_rx(struct sk_buff *skb); 46 47 48 #ifdef CONFIG_NETPOLL 49 static inline int netpoll_rx(struct sk_buff *skb) 50 { 51 struct netpoll_info *npinfo = skb->dev->npinfo; 52 unsigned long flags; 53 int ret = 0; 54 55 if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) 56 return 0; 57 58 spin_lock_irqsave(&npinfo->rx_lock, flags); 59 /* check rx_flags again with the lock held */ 60 if (npinfo->rx_flags && __netpoll_rx(skb)) 61 ret = 1; 62 spin_unlock_irqrestore(&npinfo->rx_lock, flags); 63 64 return ret; 65 } 66 67 static inline void *netpoll_poll_lock(struct net_device *dev) 68 { 69 rcu_read_lock(); /* deal with race on ->npinfo */ 70 if (dev->npinfo) { 71 spin_lock(&dev->npinfo->poll_lock); 72 dev->npinfo->poll_owner = smp_processor_id(); 73 return dev->npinfo; 74 } 75 return NULL; 76 } 77 78 static inline void netpoll_poll_unlock(void *have) 79 { 80 struct netpoll_info *npi = have; 81 82 if (npi) { 83 npi->poll_owner = -1; 84 spin_unlock(&npi->poll_lock); 85 } 86 rcu_read_unlock(); 87 } 88 89 #else 90 #define netpoll_rx(a) 0 91 #define netpoll_poll_lock(a) NULL 92 #define netpoll_poll_unlock(a) 93 #endif 94 95 #endif 96