sys/netgraph7/netgraph2.h

   1 /*
   2  * Copyright (c) 2014 The DragonFly Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  * 3. Neither the name of The DragonFly Project nor the names of its
  13  *    contributors may be used to endorse or promote products derived
  14  *    from this software without specific, prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  19  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  20  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  22  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  24  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef _NETGRAPH_NETGRAPH2_H_
  31 #define _NETGRAPH_NETGRAPH2_H_
  32
  33 /*
  34  * This header implements the netgraph kernel public inline functions.
  35  */
  36
  37 #ifndef _KERNEL
  38 #error "kernel only header file"
  39 #endif
  40
  41 #ifndef _SYS_THREAD_H_
  42 #include <sys/thread.h>
  43 #endif
  44 #ifndef _NETGRAPH_NETGRAPH_H_
  45 #include <netgraph7/netgraph.h>
  46 #endif
  47
  48 extern struct lwkt_port *ng_msgport[MAXCPU];
  49
  50 /*
  51  * Return the message port for the netgraph message servicing
  52  * thread for a particular cpu.
  53  */
  54 static __inline lwkt_port_t
  55 ng_cpuport(int cpu)
  56 {
  57         KKASSERT(cpu >= 0 && cpu < ncpus);
  58         return ng_msgport[cpu];
  59 }
  60
  61 /*
  62  * Grab a reference on the item.
  63  */
  64 static __inline void
  65 ng_ref_item(item_p item)
  66 {
  67         refcount_acquire(&item->refs);
  68 }
  69
  70 /*
  71  * Release a reference on the item.
  72  *
  73  * When the last reference is released, call the item's callback function if
  74  * there is one and free the item.
  75  */
  76 static __inline void
  77 ng_unref_item(item_p item, int error)
  78 {
  79         if (refcount_release(&item->refs)) {
  80                 /* We have released the last reference */
  81                 if (item->apply != NULL) {
  82                         KKASSERT(item->apply->apply != NULL);
  83                         (*item->apply->apply)(item->apply->context, error);
  84                         ng_free_apply(item->apply);
  85                         item->apply = NULL;
  86                 }
  87                 ng_free_item(item);
  88         }
  89 }
  90
  91 #endif  /* _NETGRAPH_NETGRAPH2_H_ */