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