include/net/netprio_cgroup.h

   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
  21 struct netprio_map {
  22         struct rcu_head rcu;
  23         u32 priomap_len;
  24         u32 priomap[];
  25 };
  26
  27 #ifdef CONFIG_CGROUPS
  28
  29 struct cgroup_netprio_state {
  30         struct cgroup_subsys_state css;
  31         u32 prioidx;
  32 };
  33
  34 #ifndef CONFIG_NETPRIO_CGROUP
  35 extern int net_prio_subsys_id;
  36 #endif
  37
  38 extern void sock_update_netprioidx(struct sock *sk);
  39
  40 #if IS_BUILTIN(CONFIG_NETPRIO_CGROUP)
  41
  42 static 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
  57 static 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
  77 static 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)
  86 #endif
  87
  88 #endif  /* _NET_CLS_CGROUP_H */