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);
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)
86#endif
87
88#endif  /* _NET_CLS_CGROUP_H */