LXR linux/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#include <linux/rh_kabi.h>
  17
  18union inet_addr {
  19        __u32           all[4];
  20        __be32          ip;
  21        __be32          ip6[4];
  22        struct in_addr  in;
  23        struct in6_addr in6;
  24};
  25
  26struct netpoll {
  27        struct net_device *dev;
  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        RH_KABI_DEPRECATE(struct work_struct, cleanup_work)
  37};
  38
  39struct netpoll_info {
  40        refcount_t refcnt;
  41
  42        struct semaphore dev_lock;
  43
  44        struct sk_buff_head txq;
  45
  46        struct delayed_work tx_work;
  47
  48        struct netpoll *netpoll;
  49        struct rcu_head rcu;
  50};
  51
  52#ifdef CONFIG_NETPOLL
  53void netpoll_poll_dev(struct net_device *dev);
  54void netpoll_poll_disable(struct net_device *dev);
  55void netpoll_poll_enable(struct net_device *dev);
  56#else
  57static inline void netpoll_poll_disable(struct net_device *dev) { return; }
  58static inline void netpoll_poll_enable(struct net_device *dev) { return; }
  59#endif
  60
  61void netpoll_send_udp(struct netpoll *np, const char *msg, int len);
  62void netpoll_print_options(struct netpoll *np);
  63int netpoll_parse_options(struct netpoll *np, char *opt);
  64int __netpoll_setup(struct netpoll *np, struct net_device *ndev);
  65int netpoll_setup(struct netpoll *np);
  66void __netpoll_cleanup(struct netpoll *np);
  67void __netpoll_free(struct netpoll *np);
  68void netpoll_cleanup(struct netpoll *np);
  69netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb);
  70
  71#ifdef CONFIG_NETPOLL
  72static inline void *netpoll_poll_lock(struct napi_struct *napi)
  73{
  74        struct net_device *dev = napi->dev;
  75
  76        if (dev && dev->npinfo) {
  77                int owner = smp_processor_id();
  78
  79                while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
  80                        cpu_relax();
  81
  82                return napi;
  83        }
  84        return NULL;
  85}
  86
  87static inline void netpoll_poll_unlock(void *have)
  88{
  89        struct napi_struct *napi = have;
  90
  91        if (napi)
  92                smp_store_release(&napi->poll_owner, -1);
  93}
  94
  95static inline bool netpoll_tx_running(struct net_device *dev)
  96{
  97        return irqs_disabled();
  98}
  99
 100#else
 101static inline void *netpoll_poll_lock(struct napi_struct *napi)
 102{
 103        return NULL;
 104}
 105static inline void netpoll_poll_unlock(void *have)
 106{
 107}
 108static inline void netpoll_netdev_init(struct net_device *dev)
 109{
 110}
 111static inline bool netpoll_tx_running(struct net_device *dev)
 112{
 113        return false;
 114}
 115#endif
 116
 117#endif
 118