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 int rx_flags; 29 spinlock_t rx_lock; 30 struct netpoll *rx_np; /* netpoll that registered an rx_hook */ 31 struct sk_buff_head arp_tx; /* list of arp requests to reply to */ 32 struct sk_buff_head txq; 33 struct delayed_work tx_work; 34 }; 35 36 void netpoll_poll(struct netpoll *np); 37 void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 38 void netpoll_print_options(struct netpoll *np); 39 int netpoll_parse_options(struct netpoll *np, char *opt); 40 int netpoll_setup(struct netpoll *np); 41 int netpoll_trap(void); 42 void netpoll_set_trap(int trap); 43 void netpoll_cleanup(struct netpoll *np); 44 int __netpoll_rx(struct sk_buff *skb); 45 46 47 #ifdef CONFIG_NETPOLL 48 static inline int netpoll_rx(struct sk_buff *skb) 49 { 50 struct netpoll_info *npinfo = skb->dev->npinfo; 51 unsigned long flags; 52 int ret = 0; 53 54 if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags)) 55 return 0; 56 57 spin_lock_irqsave(&npinfo->rx_lock, flags); 58 /* check rx_flags again with the lock held */ 59 if (npinfo->rx_flags && __netpoll_rx(skb)) 60 ret = 1; 61 spin_unlock_irqrestore(&npinfo->rx_lock, flags); 62 63 return ret; 64 } 65 66 static inline int netpoll_receive_skb(struct sk_buff *skb) 67 { 68 if (!list_empty(&skb->dev->napi_list)) 69 return netpoll_rx(skb); 70 return 0; 71 } 72 73 static inline void *netpoll_poll_lock(struct napi_struct *napi) 74 { 75 struct net_device *dev = napi->dev; 76 77 rcu_read_lock(); /* deal with race on ->npinfo */ 78 if (dev && dev->npinfo) { 79 spin_lock(&napi->poll_lock); 80 napi->poll_owner = smp_processor_id(); 81 return napi; 82 } 83 return NULL; 84 } 85 86 static inline void netpoll_poll_unlock(void *have) 87 { 88 struct napi_struct *napi = have; 89 90 if (napi) { 91 napi->poll_owner = -1; 92 spin_unlock(&napi->poll_lock); 93 } 94 rcu_read_unlock(); 95 } 96 97 static inline void netpoll_netdev_init(struct net_device *dev) 98 { 99 INIT_LIST_HEAD(&dev->napi_list); 100 } 101 102 #else 103 static inline int netpoll_rx(struct sk_buff *skb) 104 { 105 return 0; 106 } 107 static inline int netpoll_receive_skb(struct sk_buff *skb) 108 { 109 return 0; 110 } 111 static inline void *netpoll_poll_lock(struct napi_struct *napi) 112 { 113 return NULL; 114 } 115 static inline void netpoll_poll_unlock(void *have) 116 { 117 } 118 static inline void netpoll_netdev_init(struct net_device *dev) 119 { 120 } 121 #endif 122 123 #endif 124