Eric Lee / smarc-fsl-linux-kernel

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include/net/cls_cgroup.h 1.4 KB
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f84517253   Herbert Xu   cls_cgroup: Store... 
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  /*
   * cls_cgroup.h			Control Group Classifier
   *
   * Authors:	Thomas Graf <tgraf@suug.ch>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the Free
   * Software Foundation; either version 2 of the License, or (at your option)
   * any later version.
   *
   */
  
  #ifndef _NET_CLS_CGROUP_H
  #define _NET_CLS_CGROUP_H
  
  #include <linux/cgroup.h>
  #include <linux/hardirq.h>
  #include <linux/rcupdate.h>
  
  #ifdef CONFIG_CGROUPS
  struct cgroup_cls_state
  {
  	struct cgroup_subsys_state css;
  	u32 classid;
  };
  
  #ifdef CONFIG_NET_CLS_CGROUP
  static inline u32 task_cls_classid(struct task_struct *p)
  {
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  	int classid;
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  	if (in_interrupt())
  		return 0;
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  	rcu_read_lock();
  	classid = container_of(task_subsys_state(p, net_cls_subsys_id),
  			       struct cgroup_cls_state, css)->classid;
  	rcu_read_unlock();
  
  	return classid;
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  }
  #else
  extern int net_cls_subsys_id;
  
  static inline u32 task_cls_classid(struct task_struct *p)
  {
  	int id;
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  	u32 classid = 0;
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  	if (in_interrupt())
  		return 0;
  
  	rcu_read_lock();
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  	id = rcu_dereference_index_check(net_cls_subsys_id,
  					 rcu_read_lock_held());
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  	if (id >= 0)
  		classid = container_of(task_subsys_state(p, id),
  				       struct cgroup_cls_state, css)->classid;
  	rcu_read_unlock();
  
  	return classid;
  }
  #endif
  #else
  static inline u32 task_cls_classid(struct task_struct *p)
  {
  	return 0;
  }
  #endif
  #endif  /* _NET_CLS_CGROUP_H */