| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 | char dev_name[IFNAMSIZ]; |
| 28 | const char *name; |
| 29 | |
| 30 | union inet_addr local_ip, remote_ip; |
| 31 | bool ipv6; |
| 32 | u16 local_port, remote_port; |
| 33 | u8 remote_mac[ETH_ALEN]; |
| 34 | |
| 35 | struct work_struct cleanup_work; |
| 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 | void 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_async(struct netpoll *np); |
| 67 | void netpoll_cleanup(struct netpoll *np); |
| 68 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
| 69 | struct net_device *dev); |
| 70 | static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
| 71 | { |
| 72 | unsigned long flags; |
| 73 | local_irq_save(flags); |
| 74 | netpoll_send_skb_on_dev(np, skb, np->dev); |
| 75 | local_irq_restore(flags); |
| 76 | } |
| 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 && 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 void netpoll_netdev_init(struct net_device *dev) |
| 116 | { |
| 117 | } |
| 118 | static inline bool netpoll_tx_running(struct net_device *dev) |
| 119 | { |
| 120 | return false; |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | #endif |