include/linux/netpoll.h

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