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 #include <linux/refcount.h>
  15
  16 union inet_addr {
  17         __u32           all[4];
  18         __be32          ip;
  19         __be32          ip6[4];
  20         struct in_addr  in;
  21         struct in6_addr in6;
  22 };
  23
  24 struct netpoll {
  25         struct net_device *dev;
  26         char dev_name[IFNAMSIZ];
  27         const char *name;
  28
  29         union inet_addr local_ip, remote_ip;
  30         bool ipv6;
  31         u16 local_port, remote_port;
  32         u8 remote_mac[ETH_ALEN];
  33
  34         struct work_struct cleanup_work;
  35 };
  36
  37 struct netpoll_info {
  38         refcount_t refcnt;
  39
  40         struct semaphore dev_lock;
  41
  42         struct sk_buff_head txq;
  43
  44         struct delayed_work tx_work;
  45
  46         struct netpoll *netpoll;
  47         struct rcu_head rcu;
  48 };
  49
  50 #ifdef CONFIG_NETPOLL
  51 extern void netpoll_poll_disable(struct net_device *dev);
  52 extern void netpoll_poll_enable(struct net_device *dev);
  53 #else
  54 static inline void netpoll_poll_disable(struct net_device *dev) { return; }
  55 static inline void netpoll_poll_enable(struct net_device *dev) { return; }
  56 #endif
  57
  58 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  59 void netpoll_print_options(struct netpoll *np);
  60 int netpoll_parse_options(struct netpoll *np, char *opt);
  61 int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
  62 int netpoll_setup(struct netpoll *np);
  63 void __netpoll_cleanup(struct netpoll *np);
  64 void __netpoll_free_async(struct netpoll *np);
  65 void netpoll_cleanup(struct netpoll *np);
  66 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
  67                              struct net_device *dev);
  68 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
  69 {
  70         unsigned long flags;
  71         local_irq_save(flags);
  72         netpoll_send_skb_on_dev(np, skb, np->dev);
  73         local_irq_restore(flags);
  74 }
  75
  76 #ifdef CONFIG_NETPOLL
  77 static inline void *netpoll_poll_lock(struct napi_struct *napi)
  78 {
  79         struct net_device *dev = napi->dev;
  80
  81         if (dev && dev->npinfo) {
  82                 int owner = smp_processor_id();
  83
  84                 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
  85                         cpu_relax();
  86
  87                 return napi;
  88         }
  89         return NULL;
  90 }
  91
  92 static inline void netpoll_poll_unlock(void *have)
  93 {
  94         struct napi_struct *napi = have;
  95
  96         if (napi)
  97                 smp_store_release(&napi->poll_owner, -1);
  98 }
  99
 100 static inline bool netpoll_tx_running(struct net_device *dev)
 101 {
 102         return irqs_disabled();
 103 }
 104
 105 #else
 106 static inline void *netpoll_poll_lock(struct napi_struct *napi)
 107 {
 108         return NULL;
 109 }
 110 static inline void netpoll_poll_unlock(void *have)
 111 {
 112 }
 113 static inline void netpoll_netdev_init(struct net_device *dev)
 114 {
 115 }
 116 static inline bool netpoll_tx_running(struct net_device *dev)
 117 {
 118         return false;
 119 }
 120 #endif
 121
 122 #endif