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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Common code for low-level network console, dump, and debugger code4 *5 * Derived from netconsole, kgdb-over-ethernet, and netdump patches6 */7 8#ifndef _LINUX_NETPOLL_H9#define _LINUX_NETPOLL_H10 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 17union 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 25struct 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};36 37struct netpoll_info {38 refcount_t refcnt;39 40 struct semaphore dev_lock;41 42 struct sk_buff_head txq;43 44 struct delayed_work tx_work;45 46 struct netpoll *netpoll;47 struct rcu_head rcu;48};49 50#ifdef CONFIG_NETPOLL51void netpoll_poll_dev(struct net_device *dev);52void netpoll_poll_disable(struct net_device *dev);53void netpoll_poll_enable(struct net_device *dev);54#else55static inline void netpoll_poll_disable(struct net_device *dev) { return; }56static inline void netpoll_poll_enable(struct net_device *dev) { return; }57#endif58 59void netpoll_send_udp(struct netpoll *np, const char *msg, int len);60void netpoll_print_options(struct netpoll *np);61int netpoll_parse_options(struct netpoll *np, char *opt);62int __netpoll_setup(struct netpoll *np, struct net_device *ndev);63int netpoll_setup(struct netpoll *np);64void __netpoll_cleanup(struct netpoll *np);65void __netpoll_free(struct netpoll *np);66void netpoll_cleanup(struct netpoll *np);67void do_netpoll_cleanup(struct netpoll *np);68netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);69 70#ifdef CONFIG_NETPOLL71static inline void *netpoll_poll_lock(struct napi_struct *napi)72{73 struct net_device *dev = napi->dev;74 75 if (dev && dev->npinfo) {76 int owner = smp_processor_id();77 78 while (cmpxchg(&napi->poll_owner, -1, owner) != -1)79 cpu_relax();80 81 return napi;82 }83 return NULL;84}85 86static inline void netpoll_poll_unlock(void *have)87{88 struct napi_struct *napi = have;89 90 if (napi)91 smp_store_release(&napi->poll_owner, -1);92}93 94static inline bool netpoll_tx_running(struct net_device *dev)95{96 return irqs_disabled();97}98 99#else100static inline void *netpoll_poll_lock(struct napi_struct *napi)101{102 return NULL;103}104static inline void netpoll_poll_unlock(void *have)105{106}107static inline bool netpoll_tx_running(struct net_device *dev)108{109 return false;110}111#endif112 113#endif114