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
  15union 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
  23struct 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
  36struct 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
  50extern void netpoll_poll_disable(struct net_device *dev);
  51extern void netpoll_poll_enable(struct net_device *dev);
  52#else
  53static inline void netpoll_poll_disable(struct net_device *dev) { return; }
  54static inline void netpoll_poll_enable(struct net_device *dev) { return; }
  55#endif
  56
  57void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  58void netpoll_print_options(struct netpoll *np);
  59int netpoll_parse_options(struct netpoll *np, char *opt);
  60int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
  61int netpoll_setup(struct netpoll *np);
  62void __netpoll_cleanup(struct netpoll *np);
  63void __netpoll_free_async(struct netpoll *np);
  64void netpoll_cleanup(struct netpoll *np);
  65void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
  66                             struct net_device *dev);
  67static 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
  76static inline void *netpoll_poll_lock(struct napi_struct *napi)
  77{
  78        struct net_device *dev = napi->dev;
  79
  80        if (dev && dev->npinfo) {
  81                spin_lock(&napi->poll_lock);
  82                napi->poll_owner = smp_processor_id();
  83                return napi;
  84        }
  85        return NULL;
  86}
  87
  88static inline void netpoll_poll_unlock(void *have)
  89{
  90        struct napi_struct *napi = have;
  91
  92        if (napi) {
  93                napi->poll_owner = -1;
  94                spin_unlock(&napi->poll_lock);
  95        }
  96}
  97
  98static inline bool netpoll_tx_running(struct net_device *dev)
  99{
 100        return irqs_disabled();
 101}
 102
 103#else
 104static inline void *netpoll_poll_lock(struct napi_struct *napi)
 105{
 106        return NULL;
 107}
 108static inline void netpoll_poll_unlock(void *have)
 109{
 110}
 111static inline void netpoll_netdev_init(struct net_device *dev)
 112{
 113}
 114static inline bool netpoll_tx_running(struct net_device *dev)
 115{
 116        return false;
 117}
 118#endif
 119
 120#endif
 121