linux/include/net/netprio_cgroup.h
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   1/*
   2 * netprio_cgroup.h                     Control Group Priority set
   3 *
   4 *
   5 * Authors:     Neil Horman <nhorman@tuxdriver.com>
   6 *
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License as published by the Free
   9 * Software Foundation; either version 2 of the License, or (at your option)
  10 * any later version.
  11 *
  12 */
  13
  14#ifndef _NETPRIO_CGROUP_H
  15#define _NETPRIO_CGROUP_H
  16#include <linux/cgroup.h>
  17#include <linux/hardirq.h>
  18#include <linux/rcupdate.h>
  19
  20
  21struct netprio_map {
  22        struct rcu_head rcu;
  23        u32 priomap_len;
  24        u32 priomap[];
  25};
  26
  27#ifdef CONFIG_CGROUPS
  28
  29struct cgroup_netprio_state {
  30        struct cgroup_subsys_state css;
  31        u32 prioidx;
  32};
  33
  34#ifndef CONFIG_NETPRIO_CGROUP
  35extern int net_prio_subsys_id;
  36#endif
  37
  38extern void sock_update_netprioidx(struct sock *sk, struct task_struct *task);
  39
  40#if IS_BUILTIN(CONFIG_NETPRIO_CGROUP)
  41
  42static inline u32 task_netprioidx(struct task_struct *p)
  43{
  44        struct cgroup_netprio_state *state;
  45        u32 idx;
  46
  47        rcu_read_lock();
  48        state = container_of(task_subsys_state(p, net_prio_subsys_id),
  49                             struct cgroup_netprio_state, css);
  50        idx = state->prioidx;
  51        rcu_read_unlock();
  52        return idx;
  53}
  54
  55#elif IS_MODULE(CONFIG_NETPRIO_CGROUP)
  56
  57static inline u32 task_netprioidx(struct task_struct *p)
  58{
  59        struct cgroup_netprio_state *state;
  60        int subsys_id;
  61        u32 idx = 0;
  62
  63        rcu_read_lock();
  64        subsys_id = rcu_dereference_index_check(net_prio_subsys_id,
  65                                                rcu_read_lock_held());
  66        if (subsys_id >= 0) {
  67                state = container_of(task_subsys_state(p, subsys_id),
  68                                     struct cgroup_netprio_state, css);
  69                idx = state->prioidx;
  70        }
  71        rcu_read_unlock();
  72        return idx;
  73}
  74
  75#else
  76
  77static inline u32 task_netprioidx(struct task_struct *p)
  78{
  79        return 0;
  80}
  81
  82#endif /* CONFIG_NETPRIO_CGROUP */
  83
  84#else
  85#define sock_update_netprioidx(sk, task)
  86#endif
  87
  88#endif  /* _NET_CLS_CGROUP_H */
  89
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