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 struct work_struct refill_wq; 37 }; 38 39 struct netpoll_info { 40 refcount_t refcnt; 41 42 struct semaphore dev_lock; 43 44 struct sk_buff_head txq; 45 46 struct delayed_work tx_work; 47 48 struct netpoll *netpoll; 49 struct rcu_head rcu; 50 }; 51 52 #ifdef CONFIG_NETPOLL 53 void netpoll_poll_dev(struct net_device *dev); 54 void netpoll_poll_disable(struct net_device *dev); 55 void netpoll_poll_enable(struct net_device *dev); 56 #else 57 static inline void netpoll_poll_disable(struct net_device *dev) { return; } 58 static inline void netpoll_poll_enable(struct net_device *dev) { return; } 59 #endif 60 61 int netpoll_send_udp(struct netpoll *np, const char *msg, int len); 62 void netpoll_print_options(struct netpoll *np); 63 int netpoll_parse_options(struct netpoll *np, char *opt); 64 int __netpoll_setup(struct netpoll *np, struct net_device *ndev); 65 int netpoll_setup(struct netpoll *np); 66 void __netpoll_cleanup(struct netpoll *np); 67 void __netpoll_free(struct netpoll *np); 68 void netpoll_cleanup(struct netpoll *np); 69 void do_netpoll_cleanup(struct netpoll *np); 70 netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); 71 72 #ifdef CONFIG_NETPOLL 73 static inline void *netpoll_poll_lock(struct napi_struct *napi) 74 { 75 struct net_device *dev = napi->dev; 76 77 if (dev && rcu_access_pointer(dev->npinfo)) { 78 int owner = smp_processor_id(); 79 80 while (cmpxchg(&napi->poll_owner, -1, owner) != -1) 81 cpu_relax(); 82 83 return napi; 84 } 85 return NULL; 86 } 87 88 static inline void netpoll_poll_unlock(void *have) 89 { 90 struct napi_struct *napi = have; 91 92 if (napi) 93 smp_store_release(&napi->poll_owner, -1); 94 } 95 96 static inline bool netpoll_tx_running(struct net_device *dev) 97 { 98 return irqs_disabled(); 99 } 100 101 #else 102 static inline void *netpoll_poll_lock(struct napi_struct *napi) 103 { 104 return NULL; 105 } 106 static inline void netpoll_poll_unlock(void *have) 107 { 108 } 109 static inline bool netpoll_tx_running(struct net_device *dev) 110 { 111 return false; 112 } 113 #endif 114 115 #endif 116