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/*
* 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;
struct net_device *real_dev;
char dev_name[IFNAMSIZ];
const char *name;
void (*rx_hook)(struct netpoll *, int, char *, int);
__be32 local_ip, remote_ip;
u16 local_port, remote_port;
u8 remote_mac[ETH_ALEN];
struct list_head rx; /* rx_np list element */
};
struct netpoll_info {
atomic_t refcnt;
int rx_flags;
spinlock_t rx_lock;
struct list_head rx_np; /* netpolls that registered an rx_hook */
struct sk_buff_head arp_tx; /* list of arp requests to reply to */
struct sk_buff_head txq;
struct delayed_work tx_work;
struct netpoll *netpoll;
};
void netpoll_poll_dev(struct net_device *dev);
void netpoll_poll(struct netpoll *np);
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);
int netpoll_setup(struct netpoll *np);
int netpoll_trap(void);
void netpoll_set_trap(int trap);
void __netpoll_cleanup(struct netpoll *np);
void netpoll_cleanup(struct netpoll *np);
int __netpoll_rx(struct sk_buff *skb);
void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
#ifdef CONFIG_NETPOLL
static inline bool netpoll_rx(struct sk_buff *skb)
{
struct netpoll_info *npinfo;
unsigned long flags;
bool ret = false;
rcu_read_lock_bh();
npinfo = rcu_dereference_bh(skb->dev->npinfo);
if (!npinfo || (list_empty(&npinfo->rx_np) && !npinfo->rx_flags))
goto out;
spin_lock_irqsave(&npinfo->rx_lock, flags);
/* check rx_flags again with the lock held */
if (npinfo->rx_flags && __netpoll_rx(skb))
ret = true;
spin_unlock_irqrestore(&npinfo->rx_lock, flags);
out:
rcu_read_unlock_bh();
return ret;
}
static inline int netpoll_rx_on(struct sk_buff *skb)
{
struct netpoll_info *npinfo = rcu_dereference_bh(skb->dev->npinfo);
return npinfo && (!list_empty(&npinfo->rx_np) || npinfo->rx_flags);
}
static inline int netpoll_receive_skb(struct sk_buff *skb)
{
if (!list_empty(&skb->dev->napi_list))
return netpoll_rx(skb);
return 0;
}
static inline void *netpoll_poll_lock(struct napi_struct *napi)
{
struct net_device *dev = napi->dev;
if (dev && dev->npinfo) {
spin_lock(&napi->poll_lock);
napi->poll_owner = smp_processor_id();
return napi;
}
return NULL;
}
static inline void netpoll_poll_unlock(void *have)
{
struct napi_struct *napi = have;
if (napi) {
napi->poll_owner = -1;
spin_unlock(&napi->poll_lock);
}
}
static inline int netpoll_tx_running(struct net_device *dev)
{
return irqs_disabled();
}
#else
static inline int netpoll_rx(struct sk_buff *skb)
{
return 0;
}
static inline int netpoll_rx_on(struct sk_buff *skb)
{
return 0;
}
static inline int netpoll_receive_skb(struct sk_buff *skb)
{
return 0;
}
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 int netpoll_tx_running(struct net_device *dev)
{
return 0;
}
#endif
#endif
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