2 * Common code for low-level network console, dump, and debugger code
4 * Derived from netconsole, kgdb-over-ethernet, and netdump patches
7 #ifndef _LINUX_NETPOLL_H
8 #define _LINUX_NETPOLL_H
10 #include <linux/netdevice.h>
11 #include <linux/interrupt.h>
12 #include <linux/rcupdate.h>
13 #include <linux/list.h>
24 struct net_device
*dev
;
25 char dev_name
[IFNAMSIZ
];
27 void (*rx_hook
)(struct netpoll
*, int, char *, int);
29 union inet_addr local_ip
, remote_ip
;
31 u16 local_port
, remote_port
;
32 u8 remote_mac
[ETH_ALEN
];
34 struct list_head rx
; /* rx_np list element */
43 struct list_head rx_np
; /* netpolls that registered an rx_hook */
45 struct sk_buff_head neigh_tx
; /* list of neigh requests to reply to */
46 struct sk_buff_head txq
;
48 struct delayed_work tx_work
;
50 struct netpoll
*netpoll
;
54 void netpoll_send_udp(struct netpoll
*np
, const char *msg
, int len
);
55 void netpoll_print_options(struct netpoll
*np
);
56 int netpoll_parse_options(struct netpoll
*np
, char *opt
);
57 int __netpoll_setup(struct netpoll
*np
, struct net_device
*ndev
, gfp_t gfp
);
58 int netpoll_setup(struct netpoll
*np
);
59 int netpoll_trap(void);
60 void netpoll_set_trap(int trap
);
61 void __netpoll_cleanup(struct netpoll
*np
);
62 void __netpoll_free_rcu(struct netpoll
*np
);
63 void netpoll_cleanup(struct netpoll
*np
);
64 int __netpoll_rx(struct sk_buff
*skb
, struct netpoll_info
*npinfo
);
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
)
70 local_irq_save(flags
);
71 netpoll_send_skb_on_dev(np
, skb
, np
->dev
);
72 local_irq_restore(flags
);
78 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
80 struct netpoll_info
*npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
82 return npinfo
&& (!list_empty(&npinfo
->rx_np
) || npinfo
->rx_flags
);
85 static inline bool netpoll_rx(struct sk_buff
*skb
)
87 struct netpoll_info
*npinfo
;
91 local_irq_save(flags
);
93 if (!netpoll_rx_on(skb
))
96 npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
97 spin_lock(&npinfo
->rx_lock
);
98 /* check rx_flags again with the lock held */
99 if (npinfo
->rx_flags
&& __netpoll_rx(skb
, npinfo
))
101 spin_unlock(&npinfo
->rx_lock
);
104 local_irq_restore(flags
);
108 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
110 if (!list_empty(&skb
->dev
->napi_list
))
111 return netpoll_rx(skb
);
115 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
117 struct net_device
*dev
= napi
->dev
;
119 if (dev
&& dev
->npinfo
) {
120 spin_lock(&napi
->poll_lock
);
121 napi
->poll_owner
= smp_processor_id();
127 static inline void netpoll_poll_unlock(void *have
)
129 struct napi_struct
*napi
= have
;
132 napi
->poll_owner
= -1;
133 spin_unlock(&napi
->poll_lock
);
137 static inline bool netpoll_tx_running(struct net_device
*dev
)
139 return irqs_disabled();
143 static inline bool netpoll_rx(struct sk_buff
*skb
)
147 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
151 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
155 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
159 static inline void netpoll_poll_unlock(void *have
)
162 static inline void netpoll_netdev_init(struct net_device
*dev
)
165 static inline bool netpoll_tx_running(struct net_device
*dev
)
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