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 struct sk_buff_head skb_pool; 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 void netpoll_poll_dev(struct net_device *dev); 53 void netpoll_poll_disable(struct net_device *dev); 54 void netpoll_poll_enable(struct net_device *dev); 55 #else 56 static inline void netpoll_poll_disable(struct net_device *dev) { return; } 57 static inline void netpoll_poll_enable(struct net_device *dev) { return; } 58 #endif 59 60 int netpoll_send_udp(struct netpoll *np, const char *msg, int len); 61 void netpoll_print_options(struct netpoll *np); 62 int netpoll_parse_options(struct netpoll *np, char *opt); 63 int __netpoll_setup(struct netpoll *np, struct net_device *ndev); 64 int netpoll_setup(struct netpoll *np); 65 void __netpoll_cleanup(struct netpoll *np); 66 void __netpoll_free(struct netpoll *np); 67 void netpoll_cleanup(struct netpoll *np); 68 void do_netpoll_cleanup(struct netpoll *np); 69 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); 70 71 #ifdef CONFIG_NETPOLL 72 static inline void *netpoll_poll_lock(struct napi_struct *napi) 73 { 74 struct net_device *dev = napi->dev; 75 76 if (dev && rcu_access_pointer(dev->npinfo)) { 77 int owner = smp_processor_id(); 78 79 while (cmpxchg(&napi->poll_owner, -1, owner) != -1) 80 cpu_relax(); 81 82 return napi; 83 } 84 return NULL; 85 } 86 87 static inline void netpoll_poll_unlock(void *have) 88 { 89 struct napi_struct *napi = have; 90 91 if (napi) 92 smp_store_release(&napi->poll_owner, -1); 93 } 94 95 static inline bool netpoll_tx_running(struct net_device *dev) 96 { 97 return irqs_disabled(); 98 } 99 100 #else 101 static inline void *netpoll_poll_lock(struct napi_struct *napi) 102 { 103 return NULL; 104 } 105 static inline void netpoll_poll_unlock(void *have) 106 { 107 } 108 static inline bool netpoll_tx_running(struct net_device *dev) 109 { 110 return false; 111 } 112 #endif 113 114 #endif 115