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TOMOYO Linux Cross Reference
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 
 15 struct 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         struct list_head rx; /* rx_np list element */
 26         struct rcu_head rcu;
 27 };
 28 
 29 struct netpoll_info {
 30         atomic_t refcnt;
 31 
 32         int rx_flags;
 33         spinlock_t rx_lock;
 34         struct list_head rx_np; /* netpolls that registered an rx_hook */
 35 
 36         struct sk_buff_head arp_tx; /* list of arp requests to reply to */
 37         struct sk_buff_head txq;
 38 
 39         struct delayed_work tx_work;
 40 
 41         struct netpoll *netpoll;
 42         struct rcu_head rcu;
 43 };
 44 
 45 void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
 46 void netpoll_print_options(struct netpoll *np);
 47 int netpoll_parse_options(struct netpoll *np, char *opt);
 48 int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp);
 49 int netpoll_setup(struct netpoll *np);
 50 int netpoll_trap(void);
 51 void netpoll_set_trap(int trap);
 52 void __netpoll_cleanup(struct netpoll *np);
 53 void __netpoll_free_rcu(struct netpoll *np);
 54 void netpoll_cleanup(struct netpoll *np);
 55 int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo);
 56 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
 57                              struct net_device *dev);
 58 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
 59 {
 60         unsigned long flags;
 61         local_irq_save(flags);
 62         netpoll_send_skb_on_dev(np, skb, np->dev);
 63         local_irq_restore(flags);
 64 }
 65 
 66 
 67 
 68 #ifdef CONFIG_NETPOLL
 69 static inline bool netpoll_rx_on(struct sk_buff *skb)
 70 {
 71         struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
 72 
 73         return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
 74 }
 75 
 76 static inline bool netpoll_rx(struct sk_buff *skb)
 77 {
 78         struct netpoll_info *npinfo;
 79         unsigned long flags;
 80         bool ret = false;
 81 
 82         local_irq_save(flags);
 83 
 84         if (!netpoll_rx_on(skb))
 85                 goto out;
 86 
 87         npinfo = rcu_dereference_bh(skb->dev->npinfo);
 88         spin_lock(&npinfo->rx_lock);
 89         /* check rx_flags again with the lock held */
 90         if (npinfo->rx_flags && __netpoll_rx(skb, npinfo))
 91                 ret = true;
 92         spin_unlock(&npinfo->rx_lock);
 93 
 94 out:
 95         local_irq_restore(flags);
 96         return ret;
 97 }
 98 
 99 static inline int netpoll_receive_skb(struct sk_buff *skb)
100 {
101         if (!list_empty(&skb->dev->napi_list))
102                 return netpoll_rx(skb);
103         return 0;
104 }
105 
106 static inline void *netpoll_poll_lock(struct napi_struct *napi)
107 {
108         struct net_device *dev = napi->dev;
109 
110         if (dev && dev->npinfo) {
111                 spin_lock(&napi->poll_lock);
112                 napi->poll_owner = smp_processor_id();
113                 return napi;
114         }
115         return NULL;
116 }
117 
118 static inline void netpoll_poll_unlock(void *have)
119 {
120         struct napi_struct *napi = have;
121 
122         if (napi) {
123                 napi->poll_owner = -1;
124                 spin_unlock(&napi->poll_lock);
125         }
126 }
127 
128 static inline bool netpoll_tx_running(struct net_device *dev)
129 {
130         return irqs_disabled();
131 }
132 
133 #else
134 static inline bool netpoll_rx(struct sk_buff *skb)
135 {
136         return false;
137 }
138 static inline bool netpoll_rx_on(struct sk_buff *skb)
139 {
140         return false;
141 }
142 static inline int netpoll_receive_skb(struct sk_buff *skb)
143 {
144         return 0;
145 }
146 static inline void *netpoll_poll_lock(struct napi_struct *napi)
147 {
148         return NULL;
149 }
150 static inline void netpoll_poll_unlock(void *have)
151 {
152 }
153 static inline void netpoll_netdev_init(struct net_device *dev)
154 {
155 }
156 static inline bool netpoll_tx_running(struct net_device *dev)
157 {
158         return false;
159 }
160 #endif
161 
162 #endif
163 

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