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/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 remote_mac[ETH_ALEN];
  24 };
  25
  26 struct netpoll_info {
  27         atomic_t refcnt;
  28 <<<<<<< HEAD:include/linux/netpoll.h
  29 =======
  30         int rx_flags;
  31 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:include/linux/netpoll.h
  32         spinlock_t rx_lock;
  33         struct netpoll *rx_np; /* netpoll that registered an rx_hook */
  34         struct sk_buff_head arp_tx; /* list of arp requests to reply to */
  35         struct sk_buff_head txq;
  36         struct delayed_work tx_work;
  37 };
  38
  39 void netpoll_poll(struct netpoll *np);
  40 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  41 void netpoll_print_options(struct netpoll *np);
  42 int netpoll_parse_options(struct netpoll *np, char *opt);
  43 int netpoll_setup(struct netpoll *np);
  44 int netpoll_trap(void);
  45 void netpoll_set_trap(int trap);
  46 void netpoll_cleanup(struct netpoll *np);
  47 int __netpoll_rx(struct sk_buff *skb);
  48
  49
  50 #ifdef CONFIG_NETPOLL
  51 static inline int netpoll_rx(struct sk_buff *skb)
  52 {
  53         struct netpoll_info *npinfo = skb->dev->npinfo;
  54         unsigned long flags;
  55         int ret = 0;
  56
  57 <<<<<<< HEAD:include/linux/netpoll.h
  58         if (!npinfo || !npinfo->rx_np)
  59 =======
  60         if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
  61 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:include/linux/netpoll.h
  62                 return 0;
  63
  64         spin_lock_irqsave(&npinfo->rx_lock, flags);
  65 <<<<<<< HEAD:include/linux/netpoll.h
  66         /* check rx_np again with the lock held */
  67         if (npinfo->rx_np && __netpoll_rx(skb))
  68 =======
  69         /* check rx_flags again with the lock held */
  70         if (npinfo->rx_flags && __netpoll_rx(skb))
  71 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:include/linux/netpoll.h
  72                 ret = 1;
  73         spin_unlock_irqrestore(&npinfo->rx_lock, flags);
  74
  75         return ret;
  76 }
  77
  78 static inline int netpoll_receive_skb(struct sk_buff *skb)
  79 {
  80         if (!list_empty(&skb->dev->napi_list))
  81                 return netpoll_rx(skb);
  82         return 0;
  83 }
  84
  85 static inline void *netpoll_poll_lock(struct napi_struct *napi)
  86 {
  87         struct net_device *dev = napi->dev;
  88
  89         rcu_read_lock(); /* deal with race on ->npinfo */
  90         if (dev && dev->npinfo) {
  91                 spin_lock(&napi->poll_lock);
  92                 napi->poll_owner = smp_processor_id();
  93                 return napi;
  94         }
  95         return NULL;
  96 }
  97
  98 static inline void netpoll_poll_unlock(void *have)
  99 {
 100         struct napi_struct *napi = have;
 101
 102         if (napi) {
 103                 napi->poll_owner = -1;
 104                 spin_unlock(&napi->poll_lock);
 105         }
 106         rcu_read_unlock();
 107 }
 108
 109 static inline void netpoll_netdev_init(struct net_device *dev)
 110 {
 111         INIT_LIST_HEAD(&dev->napi_list);
 112 }
 113
 114 #else
 115 static inline int netpoll_rx(struct sk_buff *skb)
 116 {
 117         return 0;
 118 }
 119 static inline int netpoll_receive_skb(struct sk_buff *skb)
 120 {
 121         return 0;
 122 }
 123 static inline void *netpoll_poll_lock(struct napi_struct *napi)
 124 {
 125         return NULL;
 126 }
 127 static inline void netpoll_poll_unlock(void *have)
 128 {
 129 }
 130 static inline void netpoll_netdev_init(struct net_device *dev)
 131 {
 132 }
 133 #endif
 134
 135 #endif