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 struct work_struct cleanup_work; 36 }; 37 38 struct netpoll_info { 39 refcount_t refcnt; 40 41 struct semaphore dev_lock; 42 43 struct sk_buff_head txq; 44 45 struct delayed_work tx_work; 46 47 struct netpoll *netpoll; 48 struct rcu_head rcu; 49 }; 50 51 #ifdef CONFIG_NETPOLL 52 extern void netpoll_poll_disable(struct net_device *dev); 53 extern 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_async(struct netpoll *np); 66 void netpoll_cleanup(struct netpoll *np); 67 void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, 68 struct net_device *dev); 69 static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) 70 { 71 unsigned long flags; 72 local_irq_save(flags); 73 netpoll_send_skb_on_dev(np, skb, np->dev); 74 local_irq_restore(flags); 75 } 76 77 #ifdef CONFIG_NETPOLL 78 static inline void *netpoll_poll_lock(struct napi_struct *napi) 79 { 80 struct net_device *dev = napi->dev; 81 82 if (dev && dev->npinfo) { 83 int owner = smp_processor_id(); 84 85 while (cmpxchg(&napi->poll_owner, -1, owner) != -1) 86 cpu_relax(); 87 88 return napi; 89 } 90 return NULL; 91 } 92 93 static inline void netpoll_poll_unlock(void *have) 94 { 95 struct napi_struct *napi = have; 96 97 if (napi) 98 smp_store_release(&napi->poll_owner, -1); 99 } 100 101 static inline bool netpoll_tx_running(struct net_device *dev) 102 { 103 return irqs_disabled(); 104 } 105 106 #else 107 static inline void *netpoll_poll_lock(struct napi_struct *napi) 108 { 109 return NULL; 110 } 111 static inline void netpoll_poll_unlock(void *have) 112 { 113 } 114 static inline void netpoll_netdev_init(struct net_device *dev) 115 { 116 } 117 static inline bool netpoll_tx_running(struct net_device *dev) 118 { 119 return false; 120 } 121 #endif 122 123 #endif 124