LXR linux/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
  16union 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
  24struct 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
  37struct 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
  51extern void netpoll_poll_disable(struct net_device *dev);
  52extern void netpoll_poll_enable(struct net_device *dev);
  53#else
  54static inline void netpoll_poll_disable(struct net_device *dev) { return; }
  55static inline void netpoll_poll_enable(struct net_device *dev) { return; }
  56#endif
  57
  58void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  59void netpoll_print_options(struct netpoll *np);
  60int netpoll_parse_options(struct netpoll *np, char *opt);
  61int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
  62int netpoll_setup(struct netpoll *np);
  63void __netpoll_cleanup(struct netpoll *np);
  64void __netpoll_free_async(struct netpoll *np);
  65void netpoll_cleanup(struct netpoll *np);
  66void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
  67                             struct net_device *dev);
  68static 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
  77static 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
  92static 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
 100static inline bool netpoll_tx_running(struct net_device *dev)
 101{
 102        return irqs_disabled();
 103}
 104
 105#else
 106static inline void *netpoll_poll_lock(struct napi_struct *napi)
 107{
 108        return NULL;
 109}
 110static inline void netpoll_poll_unlock(void *have)
 111{
 112}
 113static inline void netpoll_netdev_init(struct net_device *dev)
 114{
 115}
 116static inline bool netpoll_tx_running(struct net_device *dev)
 117{
 118        return false;
 119}
 120#endif
 121
 122#endif
 123