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>
16 struct net_device
*dev
;
17 char dev_name
[IFNAMSIZ
];
19 void (*rx_hook
)(struct netpoll
*, int, char *, int);
21 __be32 local_ip
, remote_ip
;
22 u16 local_port
, remote_port
;
23 u8 remote_mac
[ETH_ALEN
];
25 struct list_head rx
; /* rx_np list element */
34 struct list_head rx_np
; /* netpolls that registered an rx_hook */
36 struct sk_buff_head arp_tx
; /* list of arp requests to reply to */
37 struct sk_buff_head txq
;
39 struct delayed_work tx_work
;
41 struct netpoll
*netpoll
;
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
)
61 local_irq_save(flags
);
62 netpoll_send_skb_on_dev(np
, skb
, np
->dev
);
63 local_irq_restore(flags
);
69 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
71 struct netpoll_info
*npinfo
= rcu_dereference_bh(skb
->dev
->npinfo
);
73 return npinfo
&& (!list_empty(&npinfo
->rx_np
) || npinfo
->rx_flags
);
76 static inline bool netpoll_rx(struct sk_buff
*skb
)
78 struct netpoll_info
*npinfo
;
82 local_irq_save(flags
);
84 if (!netpoll_rx_on(skb
))
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
))
92 spin_unlock(&npinfo
->rx_lock
);
95 local_irq_restore(flags
);
99 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
101 if (!list_empty(&skb
->dev
->napi_list
))
102 return netpoll_rx(skb
);
106 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
108 struct net_device
*dev
= napi
->dev
;
110 if (dev
&& dev
->npinfo
) {
111 spin_lock(&napi
->poll_lock
);
112 napi
->poll_owner
= smp_processor_id();
118 static inline void netpoll_poll_unlock(void *have
)
120 struct napi_struct
*napi
= have
;
123 napi
->poll_owner
= -1;
124 spin_unlock(&napi
->poll_lock
);
128 static inline bool netpoll_tx_running(struct net_device
*dev
)
130 return irqs_disabled();
134 static inline bool netpoll_rx(struct sk_buff
*skb
)
138 static inline bool netpoll_rx_on(struct sk_buff
*skb
)
142 static inline int netpoll_receive_skb(struct sk_buff
*skb
)
146 static inline void *netpoll_poll_lock(struct napi_struct
*napi
)
150 static inline void netpoll_poll_unlock(void *have
)
153 static inline void netpoll_netdev_init(struct net_device
*dev
)
156 static inline bool netpoll_tx_running(struct net_device
*dev
)
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