sys/net/netisr2.h

   1 /*
   2  * Copyright (c) 2004 Jeffrey M. Hsu.  All rights reserved.
   3  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Jeffrey M. Hsu.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of The DragonFly Project nor the names of its
  17  *    contributors may be used to endorse or promote products derived
  18  *    from this software without specific, prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  25  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  28  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  29  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  30  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1980, 1986, 1989, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)netisr.h    8.1 (Berkeley) 6/10/93
  63  * $FreeBSD: src/sys/net/netisr.h,v 1.21.2.5 2002/02/09 23:02:39 luigi Exp $
  64  */
  65
  66 #ifndef _NET_NETISR2_H_
  67 #define _NET_NETISR2_H_
  68
  69 #ifndef _KERNEL
  70 #error "kernel only header file"
  71 #endif
  72
  73 #include <sys/systm.h>
  74 #include <sys/msgport2.h>
  75 #include <sys/thread.h>
  76 #include <net/netisr.h>
  77
  78 extern struct thread *netisr_threads[MAXCPU];
  79
  80 /*
  81  * Return the message port for the general protocol message servicing
  82  * thread for a particular cpu.
  83  */
  84 static __inline lwkt_port_t
  85 netisr_cpuport(int cpu)
  86 {
  87         KKASSERT(cpu >= 0 && cpu < ncpus);
  88         return &netisr_threads[cpu]->td_msgport;
  89 }
  90
  91 /*
  92  * Return the current cpu's network protocol thread.
  93  */
  94 static __inline lwkt_port_t
  95 netisr_curport(void)
  96 {
  97         return netisr_cpuport(mycpuid);
  98 }
  99
 100 /*
 101  * Return the LSB of the hash.
 102  */
 103 static __inline uint32_t
 104 netisr_hashlsb(uint32_t hash)
 105 {
 106
 107         return (hash & NETISR_CPUMASK);
 108 }
 109
 110 /*
 111  * Return the cpu for the hash.
 112  */
 113 static __inline int
 114 netisr_hashcpu(uint16_t hash)
 115 {
 116
 117         return (netisr_hashlsb(hash) % netisr_ncpus);
 118 }
 119
 120 /*
 121  * Return the message port for the general protocol message servicing
 122  * thread for the hash.
 123  */
 124 static __inline lwkt_port_t
 125 netisr_hashport(uint16_t hash)
 126 {
 127         return netisr_cpuport(netisr_hashcpu(hash));
 128 }
 129
 130 #define IS_NETISR(td, n)        (&(td)->td_msgport == netisr_cpuport((n)))
 131 #define ASSERT_IS_NETISR(td, n) \
 132         KASSERT(IS_NETISR((td), (n)), ("thread %p is not netisr%d", (td), (n)))
 133 #define ASSERT_IN_NETISR(n)     ASSERT_IS_NETISR(curthread, (n))
 134 #define ASSERT_CANDOMSG_NETISR0(td) \
 135         KASSERT((td)->td_type != TD_TYPE_NETISR || IS_NETISR((td), 0), \
 136             ("can't domsg to netisr0 from thread %p", (td)))
 137
 138 static __inline int
 139 netisr_domsg_port(struct netmsg_base *nm, lwkt_port_t port)
 140 {
 141
 142 #ifdef INVARIANTS
 143         if (port == netisr_cpuport(0))
 144                 ASSERT_CANDOMSG_NETISR0(curthread);
 145 #endif
 146         return (lwkt_domsg(port, &nm->lmsg, 0));
 147 }
 148
 149 static __inline int
 150 netisr_domsg(struct netmsg_base *nm, int cpu)
 151 {
 152
 153         return (netisr_domsg_port(nm, netisr_cpuport(cpu)));
 154 }
 155
 156 static __inline void
 157 netisr_sendmsg(struct netmsg_base *nm, int cpu)
 158 {
 159
 160         lwkt_sendmsg(netisr_cpuport(cpu), &nm->lmsg);
 161 }
 162
 163 static __inline void
 164 netisr_replymsg(struct netmsg_base *nm, int error)
 165 {
 166
 167         lwkt_replymsg(&nm->lmsg, error);
 168 }
 169
 170 static __inline void
 171 netisr_forwardmsg(struct netmsg_base *nm, int next_cpu)
 172 {
 173
 174         KKASSERT(next_cpu > mycpuid && next_cpu <= ncpus);
 175         if (next_cpu < ncpus)
 176                 lwkt_forwardmsg(netisr_cpuport(next_cpu), &nm->lmsg);
 177         else
 178                 netisr_replymsg(nm, 0);
 179 }
 180
 181 #endif  /* _NET_NETISR2_H_ */