1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Common code for low-level network console, dump, and debugger code 4 * 5 * Derived from netconsole, kgdb-over-ethernet, and netdump patches 6 */ 7 8 #ifndef _LINUX_NETPOLL_H 9 #define _LINUX_NETPOLL_H 10 11 #include <linux/netdevice.h> 12 #include <linux/interrupt.h> 13 #include <linux/rcupdate.h> 14 #include <linux/list.h> 15 #include <linux/refcount.h> 16 17 union inet_addr { 18 __u32 all[4]; 19 __be32 ip; 20 __be32 ip6[4]; 21 struct in_addr in; 22 struct in6_addr in6; 23 }; 24 25 struct netpoll { 26 struct net_device *dev; 27 netdevice_tracker dev_tracker; 28 char dev_name[IFNAMSIZ]; 29 const char *name; 30 31 union inet_addr local_ip, remote_ip; 32 bool ipv6; 33 u16 local_port, remote_port; 34 u8 remote_mac[ETH_ALEN]; 35 }; 36 37 struct netpoll_info { 38 refcount_t refcnt; 39 40 struct semaphore dev_lock; 41 42 struct sk_buff_head txq; 43 44 struct delayed_work tx_work; 45 46 struct netpoll *netpoll; 47 struct rcu_head rcu; 48 }; 49 50 #ifdef CONFIG_NETPOLL 51 void netpoll_poll_dev(struct net_device *dev); 52 void netpoll_poll_disable(struct net_device *dev); 53 void netpoll_poll_enable(struct net_device *dev); 54 #else 55 static inline void netpoll_poll_disable(struct net_device *dev) { return; } 56 static inline void netpoll_poll_enable(struct net_device *dev) { return; } 57 #endif 58 59 void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 60 void netpoll_print_options(struct netpoll *np); 61 int netpoll_parse_options(struct netpoll *np, char *opt); 62 int __netpoll_setup(struct netpoll *np, struct net_device *ndev); 63 int netpoll_setup(struct netpoll *np); 64 void __netpoll_cleanup(struct netpoll *np); 65 void __netpoll_free(struct netpoll *np); 66 void netpoll_cleanup(struct netpoll *np); 67 void do_netpoll_cleanup(struct netpoll *np); 68 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); 69 70 #ifdef CONFIG_NETPOLL 71 static inline void *netpoll_poll_lock(struct napi_struct *napi) 72 { 73 struct net_device *dev = napi->dev; 74 75 if (dev && dev->npinfo) { 76 int owner = smp_processor_id(); 77 78 while (cmpxchg(&napi->poll_owner, -1, owner) != -1) 79 cpu_relax(); 80 81 return napi; 82 } 83 return NULL; 84 } 85 86 static inline void netpoll_poll_unlock(void *have) 87 { 88 struct napi_struct *napi = have; 89 90 if (napi) 91 smp_store_release(&napi->poll_owner, -1); 92 } 93 94 static inline bool netpoll_tx_running(struct net_device *dev) 95 { 96 return irqs_disabled(); 97 } 98 99 #else 100 static inline void *netpoll_poll_lock(struct napi_struct *napi) 101 { 102 return NULL; 103 } 104 static inline void netpoll_poll_unlock(void *have) 105 { 106 } 107 static inline bool netpoll_tx_running(struct net_device *dev) 108 { 109 return false; 110 } 111 #endif 112 113 #endif 114