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/netisr.c

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    1 /*
    2  * Copyright (c) 1997, Stefan Esser <se@freebsd.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 unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/net/netisr.c 103781 2002-09-22 05:56:41Z jake $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/bus.h>
   32 #include <sys/proc.h>
   33 #include <sys/interrupt.h>
   34 #include <sys/kernel.h>
   35 
   36 #include <net/netisr.h>
   37 
   38 static void swi_net(void *);
   39 
   40 void *net_ih;
   41 volatile unsigned int netisr;
   42 void (*netisrs[32])(void);
   43 
   44 void
   45 legacy_setsoftnet(void)
   46 {
   47         swi_sched(net_ih, 0);
   48 }
   49 
   50 int
   51 register_netisr(int num, netisr_t *handler)
   52 {
   53         
   54         if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
   55                 printf("register_netisr: bad isr number: %d\n", num);
   56                 return (EINVAL);
   57         }
   58         netisrs[num] = handler;
   59         return (0);
   60 }
   61 
   62 int
   63 unregister_netisr(int num)
   64 {
   65         
   66         if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
   67                 printf("unregister_netisr: bad isr number: %d\n", num);
   68                 return (EINVAL);
   69         }
   70         netisrs[num] = NULL;
   71         return (0);
   72 }
   73 
   74 #ifdef DEVICE_POLLING
   75 void netisr_pollmore(void);
   76 #endif
   77 
   78 static void
   79 swi_net(void *dummy)
   80 {
   81         u_int bits;
   82         int i;
   83 
   84 #ifdef DEVICE_POLLING
   85     for (;;) {
   86         int pollmore;
   87 #endif
   88         bits = atomic_readandclear_int(&netisr);
   89 #ifdef DEVICE_POLLING
   90         if (bits == 0)
   91                 return;
   92         pollmore = bits & (1 << NETISR_POLL);
   93 #endif
   94         while ((i = ffs(bits)) != 0) {
   95                 i--;
   96                 if (netisrs[i] != NULL)
   97                         netisrs[i]();
   98                 else
   99                         printf("swi_net: unregistered isr number: %d.\n", i);
  100                 bits &= ~(1 << i);
  101         }
  102 #ifdef DEVICE_POLLING
  103         if (pollmore)
  104                 netisr_pollmore();
  105     }
  106 #endif
  107 }
  108 
  109 static void
  110 start_netisr(void *dummy)
  111 {
  112 
  113         if (swi_add(NULL, "net", swi_net, NULL, SWI_NET, 0, &net_ih))
  114                 panic("start_netisr");
  115 }
  116 SYSINIT(start_netisr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_netisr, NULL)

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