linux/include/linux/netpoll.h
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   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
  15struct 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        __be32 local_ip, remote_ip;
  22        u16 local_port, remote_port;
  23        u8 remote_mac[ETH_ALEN];
  24};
  25
  26struct netpoll_info {
  27        atomic_t refcnt;
  28        int rx_flags;
  29        spinlock_t rx_lock;
  30        struct netpoll *rx_np; /* netpoll that registered an rx_hook */
  31        struct sk_buff_head arp_tx; /* list of arp requests to reply to */
  32        struct sk_buff_head txq;
  33        struct delayed_work tx_work;
  34};
  35
  36void netpoll_poll(struct netpoll *np);
  37void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  38void netpoll_print_options(struct netpoll *np);
  39int netpoll_parse_options(struct netpoll *np, char *opt);
  40int netpoll_setup(struct netpoll *np);
  41int netpoll_trap(void);
  42void netpoll_set_trap(int trap);
  43void netpoll_cleanup(struct netpoll *np);
  44int __netpoll_rx(struct sk_buff *skb);
  45
  46
  47#ifdef CONFIG_NETPOLL
  48static inline int netpoll_rx(struct sk_buff *skb)
  49{
  50        struct netpoll_info *npinfo = skb->dev->npinfo;
  51        unsigned long flags;
  52        int ret = 0;
  53
  54        if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
  55                return 0;
  56
  57        spin_lock_irqsave(&npinfo->rx_lock, flags);
  58        /* check rx_flags again with the lock held */
  59        if (npinfo->rx_flags && __netpoll_rx(skb))
  60                ret = 1;
  61        spin_unlock_irqrestore(&npinfo->rx_lock, flags);
  62
  63        return ret;
  64}
  65
  66static inline int netpoll_rx_on(struct sk_buff *skb)
  67{
  68        struct netpoll_info *npinfo = skb->dev->npinfo;
  69
  70        return npinfo && (npinfo->rx_np || npinfo->rx_flags);
  71}
  72
  73static inline int netpoll_receive_skb(struct sk_buff *skb)
  74{
  75        if (!list_empty(&skb->dev->napi_list))
  76                return netpoll_rx(skb);
  77        return 0;
  78}
  79
  80static inline void *netpoll_poll_lock(struct napi_struct *napi)
  81{
  82        struct net_device *dev = napi->dev;
  83
  84        rcu_read_lock(); /* deal with race on ->npinfo */
  85        if (dev && dev->npinfo) {
  86                spin_lock(&napi->poll_lock);
  87                napi->poll_owner = smp_processor_id();
  88                return napi;
  89        }
  90        return NULL;
  91}
  92
  93static inline void netpoll_poll_unlock(void *have)
  94{
  95        struct napi_struct *napi = have;
  96
  97        if (napi) {
  98                napi->poll_owner = -1;
  99                spin_unlock(&napi->poll_lock);
 100        }
 101        rcu_read_unlock();
 102}
 103
 104#else
 105static inline int netpoll_rx(struct sk_buff *skb)
 106{
 107        return 0;
 108}
 109static inline int netpoll_rx_on(struct sk_buff *skb)
 110{
 111        return 0;
 112}
 113static inline int netpoll_receive_skb(struct sk_buff *skb)
 114{
 115        return 0;
 116}
 117static inline void *netpoll_poll_lock(struct napi_struct *napi)
 118{
 119        return NULL;
 120}
 121static inline void netpoll_poll_unlock(void *have)
 122{
 123}
 124static inline void netpoll_netdev_init(struct net_device *dev)
 125{
 126}
 127#endif
 128
 129#endif
 130
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