The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/intrq.c

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    1 /*-
    2  * Copyright (c) 2000 Brian Somers <brian@Awfulhak.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD$
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/mbuf.h>
   31 #include <sys/socket.h>
   32 #include <sys/systm.h>
   33 #include <sys/time.h>
   34 
   35 #include <net/if.h>
   36 #include <net/if_var.h>
   37 #include <net/netisr.h>
   38 #include <net/intrq.h>
   39 
   40 #ifdef __i386__
   41 #include <netatm/kern_include.h>        /* XXX overkill, fixme! */
   42 #endif
   43 
   44 /*
   45  * If the appropriate intrq_present variable is zero, don't use
   46  * the queue (as it'll never get processed).
   47  * When defined, each of the network stacks declares their own
   48  * *intrq_present variable to be non-zero.
   49  */
   50 const int       atintrq1_present;
   51 const int       atintrq2_present;
   52 #ifdef NETISR_ATM
   53 const int       atmintrq_present;
   54 #endif
   55 const int       ipintrq_present;
   56 const int       ip6intrq_present;
   57 const int       ipxintrq_present;
   58 const int       natmintrq_present;
   59 const int       nsintrq_present;
   60 
   61 struct ifqueue  atintrq1;
   62 struct ifqueue  atintrq2;
   63 #ifdef NETISR_ATM
   64 struct ifqueue  atm_intrq;
   65 #endif
   66 struct ifqueue  ipintrq;
   67 struct ifqueue  ip6intrq;
   68 struct ifqueue  ipxintrq;
   69 struct ifqueue  natmintrq;
   70 struct ifqueue  nsintrq;
   71 
   72 
   73 static const struct {
   74         sa_family_t family;
   75         struct ifqueue *q;
   76         int const *present;
   77         int isr;
   78 } queue[] = {
   79 #ifdef NETISR_ATM
   80         { AF_ATM, &atm_intrq, &atmintrq_present, NETISR_ATM },
   81 #endif
   82         { AF_INET, &ipintrq, &ipintrq_present, NETISR_IP },
   83         { AF_INET6, &ip6intrq, &ip6intrq_present, NETISR_IPV6 },
   84         { AF_IPX, &ipxintrq, &ipxintrq_present, NETISR_IPX },
   85         { AF_NATM, &natmintrq, &natmintrq_present, NETISR_NATM },
   86         { AF_APPLETALK, &atintrq2, &atintrq2_present, NETISR_ATALK },
   87         { AF_NS, &nsintrq, &nsintrq_present, NETISR_NS }
   88 };
   89 
   90 int
   91 family_enqueue(family, m)
   92         sa_family_t family;
   93         struct mbuf *m;
   94 {
   95         int entry, s;
   96 
   97         for (entry = 0; entry < sizeof queue / sizeof queue[0]; entry++)
   98                 if (queue[entry].family == family) {
   99                         if (queue[entry].present) {
  100                                 s = splimp();
  101                                 if (IF_QFULL(queue[entry].q)) {
  102                                         IF_DROP(queue[entry].q);
  103                                         splx(s);
  104                                         m_freem(m);
  105                                         return ENOBUFS;
  106                                 }
  107                                 IF_ENQUEUE(queue[entry].q, m);
  108                                 splx(s);
  109                                 schednetisr(queue[entry].isr);
  110                                 return 0;
  111                         } else
  112                                 break;
  113                 }
  114 
  115         m_freem(m);
  116         return EAFNOSUPPORT;
  117 }

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