sys/net/i4b/layer2/i4b_mbuf.c

   1 /*
   2  * Copyright (c) 1997, 2001 Hellmuth Michaelis. 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  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  *---------------------------------------------------------------------------
  26  *
  27  *      i4b - mbuf handling support routines
  28  *      ------------------------------------
  29  *
  30  * $FreeBSD: src/sys/i4b/layer2/i4b_mbuf.c,v 1.6.2.1 2001/08/10 14:08:41 obrien Exp $
  31  * $DragonFly: src/sys/net/i4b/layer2/i4b_mbuf.c,v 1.8 2006/12/22 23:44:56 swildner Exp $
  32  *
  33  *      last edit-date: [Sat Jan 13 13:15:45 2001]
  34  *
  35  *---------------------------------------------------------------------------*/
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/socket.h>
  41 #include <sys/thread2.h>
  42
  43 #include <net/if.h>
  44
  45 #include "../include/i4b_mbuf.h"
  46
  47 #define I4B_MBUF_DEBUG
  48 #undef I4B_MBUF_TYPE_DEBUG
  49
  50 #ifdef I4B_MBUF_TYPE_DEBUG
  51
  52 #define MT_DCHAN        42
  53 #define MT_BCHAN        43
  54 #define MT_I4B_D        MT_DCHAN
  55 #define MT_I4B_B        MT_BCHAN
  56
  57 #else /* ! I4B_MBUF_TYPE_DEBUG */
  58
  59 #define MT_I4B_D        MT_DATA
  60 #define MT_I4B_B        MT_DATA
  61
  62 #endif /* I4B_MBUF_TYPE_DEBUG */
  63
  64 /*---------------------------------------------------------------------------*
  65  *      allocate D-channel mbuf space
  66  *---------------------------------------------------------------------------*/
  67 struct mbuf*
  68 i4b_Dgetmbuf(int len)
  69 {
  70         struct mbuf *m;
  71
  72         if(len > MCLBYTES)      /* if length > max extension size */
  73         {
  74
  75 #ifdef I4B_MBUF_DEBUG
  76                 kprintf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
  77                                         len, MCLBYTES);
  78 #endif
  79
  80                 return(NULL);
  81         }
  82
  83         MGETHDR(m, MB_DONTWAIT, MT_I4B_D);      /* get mbuf with pkthdr */
  84
  85         /* did we actually get the mbuf ? */
  86
  87         if(!m)
  88         {
  89
  90 #ifdef I4B_MBUF_DEBUG
  91                 kprintf("i4b_getbuf: error - MGETHDR failed!\n");
  92 #endif
  93
  94                 return(NULL);
  95         }
  96
  97         if(len >= MHLEN)
  98         {
  99                 MCLGET(m, MB_DONTWAIT);
 100
 101                 if(!(m->m_flags & M_EXT))
 102                 {
 103                         m_freem(m);
 104
 105 #ifdef I4B_MBUF_DEBUG
 106                         kprintf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
 107 #endif
 108
 109                         return (NULL);
 110                 }
 111         }
 112
 113         m->m_len = len;
 114
 115         return(m);
 116 }
 117
 118 /*---------------------------------------------------------------------------*
 119  *      free a D-channel mbuf
 120  *---------------------------------------------------------------------------*/
 121 void
 122 i4b_Dfreembuf(struct mbuf *m)
 123 {
 124         if(m)
 125                 m_freem(m);
 126 }
 127
 128 /*---------------------------------------------------------------------------*
 129  *      clear a D-channel ifqueue from data
 130  *---------------------------------------------------------------------------*/
 131 void
 132 i4b_Dcleanifq(struct ifqueue *ifq)
 133 {
 134         crit_enter();
 135
 136         IF_DRAIN(ifq);
 137
 138         crit_exit();
 139 }
 140
 141 /*---------------------------------------------------------------------------*
 142  *      allocate B-channel mbuf space
 143  *---------------------------------------------------------------------------*/
 144 struct mbuf*
 145 i4b_Bgetmbuf(int len)
 146 {
 147         struct mbuf *m;
 148
 149         if(len > MCLBYTES)      /* if length > max extension size */
 150         {
 151
 152 #ifdef I4B_MBUF_DEBUG
 153                 kprintf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
 154                                         len, MCLBYTES);
 155 #endif
 156
 157                 return(NULL);
 158         }
 159
 160         MGETHDR(m, MB_DONTWAIT, MT_I4B_B);      /* get mbuf with pkthdr */
 161
 162         /* did we actually get the mbuf ? */
 163
 164         if(!m)
 165         {
 166
 167 #ifdef I4B_MBUF_DEBUG
 168                 kprintf("i4b_getbuf: error - MGETHDR failed!\n");
 169 #endif
 170
 171                 return(NULL);
 172         }
 173
 174         if(len >= MHLEN)
 175         {
 176                 MCLGET(m, MB_DONTWAIT);
 177
 178                 if(!(m->m_flags & M_EXT))
 179                 {
 180                         m_freem(m);
 181
 182 #ifdef I4B_MBUF_DEBUG
 183                         kprintf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
 184 #endif
 185
 186                         return (NULL);
 187                 }
 188         }
 189
 190         m->m_len = len;
 191
 192         return(m);
 193 }
 194
 195 /*---------------------------------------------------------------------------*
 196  *      free a B-channel mbuf
 197  *---------------------------------------------------------------------------*/
 198 void
 199 i4b_Bfreembuf(struct mbuf *m)
 200 {
 201         if(m)
 202                 m_freem(m);
 203 }
 204
 205 /*---------------------------------------------------------------------------*
 206  *      clear a B-channel ifqueue from data
 207  *---------------------------------------------------------------------------*/
 208 void
 209 i4b_Bcleanifq(struct ifqueue *ifq)
 210 {
 211         crit_enter();
 212
 213         IF_DRAIN(ifq);
 214
 215         crit_exit();
 216 }
 217
 218 /* EOF */