154 lines
3.3 KiB
C
154 lines
3.3 KiB
C
/*
|
|
* 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 bool 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
|