Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

Open Menu /include/linux/netpoll.h 
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
/*
 * 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>

union inet_addr {
	__u32		all[4];
	__be32		ip;
	__be32		ip6[4];
	struct in_addr	in;
	struct in6_addr	in6;
};

struct netpoll {
	struct net_device *dev;
	char dev_name[IFNAMSIZ];
	const char *name;

	union inet_addr local_ip, remote_ip;
	bool ipv6;
	u16 local_port, remote_port;
	u8 remote_mac[ETH_ALEN];

	struct work_struct cleanup_work;
};

struct netpoll_info {
	atomic_t refcnt;

	struct semaphore dev_lock;

	struct sk_buff_head txq;

	struct delayed_work tx_work;

	struct netpoll *netpoll;
	struct rcu_head rcu;
};

#ifdef CONFIG_NETPOLL
extern void netpoll_poll_disable(struct net_device *dev);
extern void netpoll_poll_enable(struct net_device *dev);
#else
static inline void netpoll_poll_disable(struct net_device *dev) { return; }
static inline void netpoll_poll_enable(struct net_device *dev) { return; }
#endif

void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
void netpoll_print_options(struct netpoll *np);
int netpoll_parse_options(struct netpoll *np, char *opt);
int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
int netpoll_setup(struct netpoll *np);
void __netpoll_cleanup(struct netpoll *np);
void __netpoll_free_async(struct netpoll *np);
void netpoll_cleanup(struct netpoll *np);
void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
			     struct net_device *dev);
static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
{
	unsigned long flags;
	local_irq_save(flags);
	netpoll_send_skb_on_dev(np, skb, np->dev);
	local_irq_restore(flags);
}

#ifdef CONFIG_NETPOLL
static inline void *netpoll_poll_lock(struct napi_struct *napi)
{
	struct net_device *dev = napi->dev;

	if (dev && dev->npinfo) {
		int owner = smp_processor_id();

		while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
			cpu_relax();

		return napi;
	}
	return NULL;
}

static inline void netpoll_poll_unlock(void *have)
{
	struct napi_struct *napi = have;

	if (napi)
		smp_store_release(&napi->poll_owner, -1);
}

static inline bool netpoll_tx_running(struct net_device *dev)
{
	return irqs_disabled();
}

#else
static inline void *netpoll_poll_lock(struct napi_struct *napi)
{
	return NULL;
}
static inline void netpoll_poll_unlock(void *have)
{
}
static inline void netpoll_netdev_init(struct net_device *dev)
{
}
static inline bool netpoll_tx_running(struct net_device *dev)
{
	return false;
}
#endif

#endif