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