[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / netpoll.h

/*
 * Common code for low-level network console, dump, and debugger code
 *
 * Derived from netconsole, kgdb-over-ethernet, and netdump patches
 */

#ifndef _LINUX_NETPOLL_H
#define _LINUX_NETPOLL_H

#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/rcupdate.h>
#include <linux/list.h>

struct netpoll {
	struct net_device *dev;
	char dev_name[IFNAMSIZ];
	const char *name;
	void (*rx_hook)(struct netpoll *, int, char *, int);

	u32 local_ip, remote_ip;
	u16 local_port, remote_port;
 	u8 local_mac[ETH_ALEN], remote_mac[ETH_ALEN];
};

struct netpoll_info {
	atomic_t refcnt;
	spinlock_t poll_lock;
	int poll_owner;
	int rx_flags;
	spinlock_t rx_lock;
	struct netpoll *rx_np; /* netpoll that registered an rx_hook */
	struct sk_buff_head arp_tx; /* list of arp requests to reply to */
	struct sk_buff_head txq;
	struct work_struct tx_work;
};

void netpoll_poll(struct netpoll *np);
void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
int netpoll_parse_options(struct netpoll *np, char *opt);
int netpoll_setup(struct netpoll *np);
int netpoll_trap(void);
void netpoll_set_trap(int trap);
void netpoll_cleanup(struct netpoll *np);
int __netpoll_rx(struct sk_buff *skb);


#ifdef CONFIG_NETPOLL
static inline int netpoll_rx(struct sk_buff *skb)
{
	struct netpoll_info *npinfo = skb->dev->npinfo;
	unsigned long flags;
	int ret = 0;

	if (!npinfo || (!npinfo->rx_np && !npinfo->rx_flags))
		return 0;

	spin_lock_irqsave(&npinfo->rx_lock, flags);
	/* check rx_flags again with the lock held */
	if (npinfo->rx_flags && __netpoll_rx(skb))
		ret = 1;
	spin_unlock_irqrestore(&npinfo->rx_lock, flags);

	return ret;
}

static inline void *netpoll_poll_lock(struct net_device *dev)
{
	rcu_read_lock(); /* deal with race on ->npinfo */
	if (dev->npinfo) {
		spin_lock(&dev->npinfo->poll_lock);
		dev->npinfo->poll_owner = smp_processor_id();
		return dev->npinfo;
	}
	return NULL;
}

static inline void netpoll_poll_unlock(void *have)
{
	struct netpoll_info *npi = have;

	if (npi) {
		npi->poll_owner = -1;
		spin_unlock(&npi->poll_lock);
	}
	rcu_read_unlock();
}

#else
#define netpoll_rx(a) 0
#define netpoll_poll_lock(a) NULL
#define netpoll_poll_unlock(a)
#endif

#endif
Commit	Line	Data
1da177e4 LT	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>
53fb95d3	12	#include <linux/rcupdate.h>
1da177e4 LT	13	#include <linux/list.h>
1da177e4 LT	14
1da177e4 LT	15	struct netpoll {
1da177e4 LT	16	struct net_device *dev;
bf6bce71 SH	17	char dev_name[IFNAMSIZ];
bf6bce71 SH	18	const char *name;
1da177e4	19	void (rx_hook)(struct netpoll , int, char *, int);
5de4a473	20
1da177e4 LT	21	u32 local_ip, remote_ip;
1da177e4 LT	22	u16 local_port, remote_port;
bf6bce71	23	u8 local_mac[ETH_ALEN], remote_mac[ETH_ALEN];
115c1d6e JM	24	};
	25
	26	struct netpoll_info {
93ec2c72	27	atomic_t refcnt;
1da177e4 LT	28	spinlock_t poll_lock;
1da177e4 LT	29	int poll_owner;
115c1d6e	30	int rx_flags;
fbeec2e1 JM	31	spinlock_t rx_lock;
fbeec2e1 JM	32	struct netpoll rx_np; / netpoll that registered an rx_hook */
068c6e98	33	struct sk_buff_head arp_tx; /* list of arp requests to reply to */
b6cd27ed SH	34	struct sk_buff_head txq;
b6cd27ed SH	35	struct work_struct tx_work;
1da177e4 LT	36	};
	37
	38	void netpoll_poll(struct netpoll *np);
	39	void netpoll_send_udp(struct netpoll np, const char msg, int len);
	40	int netpoll_parse_options(struct netpoll np, char opt);
	41	int netpoll_setup(struct netpoll *np);
	42	int netpoll_trap(void);
	43	void netpoll_set_trap(int trap);
	44	void netpoll_cleanup(struct netpoll *np);
	45	int __netpoll_rx(struct sk_buff *skb);
5de4a473	46
1da177e4 LT	47
	48	#ifdef CONFIG_NETPOLL
	49	static inline int netpoll_rx(struct sk_buff *skb)
	50	{
115c1d6e	51	struct netpoll_info *npinfo = skb->dev->npinfo;
fbeec2e1 JM	52	unsigned long flags;
fbeec2e1 JM	53	int ret = 0;
115c1d6e	54
fbeec2e1	55	if (!npinfo \|\| (!npinfo->rx_np && !npinfo->rx_flags))
115c1d6e JM	56	return 0;
115c1d6e JM	57
fbeec2e1 JM	58	spin_lock_irqsave(&npinfo->rx_lock, flags);
	59	/* check rx_flags again with the lock held */
	60	if (npinfo->rx_flags && __netpoll_rx(skb))
	61	ret = 1;
	62	spin_unlock_irqrestore(&npinfo->rx_lock, flags);
	63
	64	return ret;
1da177e4 LT	65	}
1da177e4 LT	66
53fb95d3	67	static inline void netpoll_poll_lock(struct net_device dev)
1da177e4	68	{
53fb95d3	69	rcu_read_lock(); /* deal with race on ->npinfo */
115c1d6e JM	70	if (dev->npinfo) {
	71	spin_lock(&dev->npinfo->poll_lock);
	72	dev->npinfo->poll_owner = smp_processor_id();
53fb95d3	73	return dev->npinfo;
1da177e4	74	}
53fb95d3	75	return NULL;
1da177e4 LT	76	}
1da177e4 LT	77
53fb95d3	78	static inline void netpoll_poll_unlock(void *have)
1da177e4	79	{
53fb95d3 MM	80	struct netpoll_info *npi = have;
	81
	82	if (npi) {
	83	npi->poll_owner = -1;
	84	spin_unlock(&npi->poll_lock);
1da177e4	85	}
53fb95d3	86	rcu_read_unlock();
1da177e4 LT	87	}
	88
	89	#else
	90	#define netpoll_rx(a) 0
afb997c6	91	#define netpoll_poll_lock(a) NULL
1da177e4 LT	92	#define netpoll_poll_unlock(a)
	93	#endif
	94
	95	#endif