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/* SPDX-License-Identifier: GPL-2.0 */ /* * Common code for low-level network console, dump, and debugger code * * Derived from netconsole, kgdb-over-ethernet, and netdump patches */ #ifndef _LINUX_NETPOLL_H #define _LINUX_NETPOLL_H #include <linux/netdevice.h> #include <linux/interrupt.h> #include <linux/rcupdate.h> #include <linux/list.h> #include <linux/refcount.h> union inet_addr { __u32 all[4]; __be32 ip; __be32 ip6[4]; struct in_addr in; struct in6_addr in6; }; struct netpoll { struct net_device *dev; char dev_name[IFNAMSIZ]; const char *name; union inet_addr local_ip, remote_ip; bool ipv6; u16 local_port, remote_port; u8 remote_mac[ETH_ALEN]; }; struct netpoll_info { refcount_t refcnt; struct semaphore dev_lock; struct sk_buff_head txq; struct delayed_work tx_work; struct netpoll *netpoll; struct rcu_head rcu; }; #ifdef CONFIG_NETPOLL void netpoll_poll_dev(struct net_device *dev); void netpoll_poll_disable(struct net_device *dev); void netpoll_poll_enable(struct net_device *dev); #else static inline void netpoll_poll_disable(struct net_device *dev) { return; } static inline void netpoll_poll_enable(struct net_device *dev) { return; } #endif void netpoll_send_udp(struct netpoll *np, const char *msg, int len); void netpoll_print_options(struct netpoll *np); int netpoll_parse_options(struct netpoll *np, char *opt); int __netpoll_setup(struct netpoll *np, struct net_device *ndev); int netpoll_setup(struct netpoll *np); void __netpoll_cleanup(struct netpoll *np); void __netpoll_free(struct netpoll *np); void netpoll_cleanup(struct netpoll *np); netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb); #ifdef CONFIG_NETPOLL static inline void *netpoll_poll_lock(struct napi_struct *napi) { struct net_device *dev = napi->dev; if (dev && rcu_access_pointer(dev->npinfo)) { int owner = smp_processor_id(); while (cmpxchg(&napi->poll_owner, -1, owner) != -1) cpu_relax(); return napi; } return NULL; } static inline void netpoll_poll_unlock(void *have) { struct napi_struct *napi = have; if (napi) smp_store_release(&napi->poll_owner, -1); } static inline bool netpoll_tx_running(struct net_device *dev) { return irqs_disabled(); } #else static inline void *netpoll_poll_lock(struct napi_struct *napi) { return NULL; } static inline void netpoll_poll_unlock(void *have) { } static inline bool netpoll_tx_running(struct net_device *dev) { return false; } #endif #endif