Line data    Source code

       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           2 : static inline void netpoll_poll_disable(struct net_device *dev) { return; }
      55           2 : 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         855 : static inline void *netpoll_poll_lock(struct napi_struct *napi)
      99             : {
     100         855 :         return NULL;
     101             : }
     102           0 : static inline void netpoll_poll_unlock(void *have)
     103             : {
     104           0 : }
     105             : static inline bool netpoll_tx_running(struct net_device *dev)
     106             : {
     107             :         return false;
     108             : }
     109             : #endif
     110             : 
     111             : #endif