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
  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        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
  38struct 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
  52extern void netpoll_poll_disable(struct net_device *dev);
  53extern void netpoll_poll_enable(struct net_device *dev);
  54#else
  55static inline void netpoll_poll_disable(struct net_device *dev) { return; }
  56static inline void netpoll_poll_enable(struct net_device *dev) { return; }
  57#endif
  58
  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_async(struct netpoll *np);
  66void netpoll_cleanup(struct netpoll *np);
  67void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
  68                             struct net_device *dev);
  69static inline void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb)
  70{
  71        unsigned long flags;
  72        local_irq_save(flags);
  73        netpoll_send_skb_on_dev(np, skb, np->dev);
  74        local_irq_restore(flags);
  75}
  76
  77#ifdef CONFIG_NETPOLL
  78static inline void *netpoll_poll_lock(struct napi_struct *napi)
  79{
  80        struct net_device *dev = napi->dev;
  81
  82        if (dev && dev->npinfo) {
  83                int owner = smp_processor_id();
  84
  85                while (cmpxchg(&napi->poll_owner, -1, owner) != -1)
  86                        cpu_relax();
  87
  88                return napi;
  89        }
  90        return NULL;
  91}
  92
  93static inline void netpoll_poll_unlock(void *have)
  94{
  95        struct napi_struct *napi = have;
  96
  97        if (napi)
  98                smp_store_release(&napi->poll_owner, -1);
  99}
 100
 101static inline bool netpoll_tx_running(struct net_device *dev)
 102{
 103        return irqs_disabled();
 104}
 105
 106#else
 107static inline void *netpoll_poll_lock(struct napi_struct *napi)
 108{
 109        return NULL;
 110}
 111static inline void netpoll_poll_unlock(void *have)
 112{
 113}
 114static inline void netpoll_netdev_init(struct net_device *dev)
 115{
 116}
 117static inline bool netpoll_tx_running(struct net_device *dev)
 118{
 119        return false;
 120}
 121#endif
 122
 123#endif
 124