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 char dev_name[IFNAMSIZ]; 28 const char *name; 29 30 union inet_addr local_ip, remote_ip; 31 bool ipv6; 32 u16 local_port, remote_port; 33 u8 remote_mac[ETH_ALEN]; 34 }; 35 36 struct netpoll_info { 37 refcount_t refcnt; 38 39 struct semaphore dev_lock; 40 41 struct sk_buff_head txq; 42 43 struct delayed_work tx_work; 44 45 struct netpoll *netpoll; 46 struct rcu_head rcu; 47 }; 48 49 #ifdef CONFIG_NETPOLL 50 void netpoll_poll_dev(struct net_device *dev); 51 void netpoll_poll_disable(struct net_device *dev); 52 void netpoll_poll_enable(struct net_device *dev); 53 #else 54 static inline void netpoll_poll_disable(struct net_device *dev) { return; } 55 static inline void netpoll_poll_enable(struct net_device *dev) { return; } 56 #endif 57 58 void netpoll_send_udp(struct netpoll *np, const char *msg, int len); 59 void netpoll_print_options(struct netpoll *np); 60 int netpoll_parse_options(struct netpoll *np, char *opt); 61 int __netpoll_setup(struct netpoll *np, struct net_device *ndev); 62 int netpoll_setup(struct netpoll *np); 63 void __netpoll_cleanup(struct netpoll *np); 64 void __netpoll_free(struct netpoll *np); 65 void netpoll_cleanup(struct netpoll *np); 66 void __netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); 67 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) 68 { 69 unsigned long flags; 70 local_irq_save(flags); 71 __netpoll_send_skb(np, skb); 72 local_irq_restore(flags); 73 } 74 75 #ifdef CONFIG_NETPOLL 76 static inline void *netpoll_poll_lock(struct napi_struct *napi) 77 { 78 struct net_device *dev = napi->dev; 79 80 if (dev && dev->npinfo) { 81 int owner = smp_processor_id(); 82 83 while (cmpxchg(&napi->poll_owner, -1, owner) != -1) 84 cpu_relax(); 85 86 return napi; 87 } 88 return NULL; 89 } 90 91 static inline void netpoll_poll_unlock(void *have) 92 { 93 struct napi_struct *napi = have; 94 95 if (napi) 96 smp_store_release(&napi->poll_owner, -1); 97 } 98 99 static inline bool netpoll_tx_running(struct net_device *dev) 100 { 101 return irqs_disabled(); 102 } 103 104 #else 105 static inline void *netpoll_poll_lock(struct napi_struct *napi) 106 { 107 return NULL; 108 } 109 static inline void netpoll_poll_unlock(void *have) 110 { 111 } 112 static inline void netpoll_netdev_init(struct net_device *dev) 113 { 114 } 115 static inline bool netpoll_tx_running(struct net_device *dev) 116 { 117 return false; 118 } 119 #endif 120 121 #endif 122