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 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); 67 68 #ifdef CONFIG_NETPOLL 69 static inline void *netpoll_poll_lock(struct napi_struct *napi) 70 { 71 struct net_device *dev = napi->dev; 72 73 if (dev && dev->npinfo) { 74 int owner = smp_processor_id(); 75 76 while (cmpxchg(&napi->poll_owner, -1, owner) != -1) 77 cpu_relax(); 78 79 return napi; 80 } 81 return NULL; 82 } 83 84 static inline void netpoll_poll_unlock(void *have) 85 { 86 struct napi_struct *napi = have; 87 88 if (napi) 89 smp_store_release(&napi->poll_owner, -1); 90 } 91 92 static inline bool netpoll_tx_running(struct net_device *dev) 93 { 94 return irqs_disabled(); 95 } 96 97 #else 98 static inline void *netpoll_poll_lock(struct napi_struct *napi) 99 { 100 return NULL; 101 } 102 static inline void netpoll_poll_unlock(void *have) 103 { 104 } 105 static inline bool netpoll_tx_running(struct net_device *dev) 106 { 107 return false; 108 } 109 #endif 110 111 #endif 112