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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/net/cls_cgroup.h
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/*

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 * cls_cgroup.h			Control Group Classifier

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 *

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 * Authors:	Thomas Graf <[email protected]>

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 *

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 * This program is free software; you can redistribute it and/or modify it

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 * under the terms of the GNU General Public License as published by the Free

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 * Software Foundation; either version 2 of the License, or (at your option)

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 * any later version.

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 *

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 */

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#ifndef _NET_CLS_CGROUP_H

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#define _NET_CLS_CGROUP_H

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#include <linux/cgroup.h>

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#include <linux/hardirq.h>

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#include <linux/rcupdate.h>

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#ifdef CONFIG_CGROUPS

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struct cgroup_cls_state

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{

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	struct cgroup_subsys_state css;

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	u32 classid;

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};

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#ifdef CONFIG_NET_CLS_CGROUP

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static inline u32 task_cls_classid(struct task_struct *p)

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{

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	int classid;

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	if (in_interrupt())

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		return 0;

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	rcu_read_lock();

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	classid = container_of(task_subsys_state(p, net_cls_subsys_id),

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			       struct cgroup_cls_state, css)->classid;

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	rcu_read_unlock();

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	return classid;

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}

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#else

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extern int net_cls_subsys_id;

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static inline u32 task_cls_classid(struct task_struct *p)

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{

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	int id;

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	u32 classid = 0;

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	if (in_interrupt())

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		return 0;

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	rcu_read_lock();

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	id = rcu_dereference_index_check(net_cls_subsys_id,

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					 rcu_read_lock_held());

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	if (id >= 0)

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		classid = container_of(task_subsys_state(p, id),

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				       struct cgroup_cls_state, css)->classid;

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	rcu_read_unlock();

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	return classid;

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}

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#endif

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#else

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static inline u32 task_cls_classid(struct task_struct *p)

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{

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	return 0;

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}

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#endif

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#endif  /* _NET_CLS_CGROUP_H */

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