Eric Lee / smarc-fsl-linux-kernel

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include/linux/netpoll.h 2.69 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /* SPDX-License-Identifier: GPL-2.0 */
  /*
   * 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>
  #include <linux/refcount.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 {
  	refcount_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