sys/netisdn/i4b_mbuf.c

   1 /*
   2  * Copyright (c) 1997, 2000 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  *      $Id: i4b_mbuf.c,v 1.5 2005/12/11 12:25:06 christos Exp $
  31  *
  32  * $FreeBSD$
  33  *
  34  *      last edit-date: [Fri Jan  5 11:33:47 2001]
  35  *
  36  *---------------------------------------------------------------------------*/
  37
  38 #include <sys/cdefs.h>
  39 __KERNEL_RCSID(0, "$NetBSD: i4b_mbuf.c,v 1.3.16.1 2005/03/04 16:53:45 skrll Exp $");
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/mbuf.h>
  44 #include <sys/tty.h>
  45 #include <sys/proc.h>
  46 #include <sys/uio.h>
  47 #include <sys/kernel.h>
  48 #include <sys/socket.h>
  49 #include <net/if.h>
  50
  51 #include <netisdn/i4b_mbuf.h>
  52 #include <netisdn/i4b_global.h>
  53
  54 #define I4B_MBUF_DEBUG
  55 #undef I4B_MBUF_TYPE_DEBUG
  56
  57 #ifdef I4B_MBUF_TYPE_DEBUG
  58
  59 #ifdef  __FreeBSD__
  60
  61 #define MT_DCHAN        42
  62 #define MT_BCHAN        43
  63
  64 #else /* NetBSD */
  65
  66 #define MT_DCHAN        MT_DATA
  67 #define MT_BCHAN        MT_DATA
  68
  69 #endif
  70
  71 #define MT_I4B_D        MT_DCHAN
  72 #define MT_I4B_B        MT_BCHAN
  73
  74 #else /* ! I4B_MBUF_TYPE_DEBUG */
  75
  76 #define MT_I4B_D        MT_DATA
  77 #define MT_I4B_B        MT_DATA
  78
  79 #endif /* I4B_MBUF_TYPE_DEBUG */
  80
  81 /*---------------------------------------------------------------------------*
  82  *      allocate D-channel mbuf space
  83  *---------------------------------------------------------------------------*/
  84 struct mbuf*
  85 i4b_Dgetmbuf(int len)
  86 {
  87         struct mbuf *m;
  88
  89         if(len > MCLBYTES)      /* if length > max extension size */
  90         {
  91
  92 #ifdef I4B_MBUF_DEBUG
  93                 printf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
  94                                         len, MCLBYTES);
  95 #endif
  96
  97                 return(NULL);
  98         }
  99
 100         MGETHDR(m, M_DONTWAIT, MT_I4B_D);       /* get mbuf with pkthdr */
 101
 102         /* did we actually get the mbuf ? */
 103
 104         if(!m)
 105         {
 106
 107 #ifdef I4B_MBUF_DEBUG
 108                 printf("i4b_getbuf: error - MGETHDR failed!\n");
 109 #endif
 110
 111                 return(NULL);
 112         }
 113
 114         if(len >= MHLEN)
 115         {
 116                 MCLGET(m, M_DONTWAIT);
 117
 118                 if(!(m->m_flags & M_EXT))
 119                 {
 120                         m_freem(m);
 121
 122 #ifdef I4B_MBUF_DEBUG
 123                         printf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
 124 #endif
 125
 126                         return (NULL);
 127                 }
 128         }
 129
 130         m->m_len = len;
 131
 132         return(m);
 133 }
 134
 135 /*---------------------------------------------------------------------------*
 136  *      free a D-channel mbuf
 137  *---------------------------------------------------------------------------*/
 138 void
 139 i4b_Dfreembuf(struct mbuf *m)
 140 {
 141         if(m)
 142                 m_freem(m);
 143 }
 144
 145 /*---------------------------------------------------------------------------*
 146  *      clear a D-channel ifqueue from data
 147  *---------------------------------------------------------------------------*/
 148 void
 149 i4b_Dcleanifq(struct ifqueue *ifq)
 150 {
 151         struct mbuf *m;
 152         int x = splnet();
 153
 154         while(!IF_QEMPTY(ifq))
 155         {
 156                 IF_DEQUEUE(ifq, m);
 157                 i4b_Dfreembuf(m);
 158         }
 159
 160         splx(x);
 161 }
 162
 163 /*---------------------------------------------------------------------------*
 164  *      allocate B-channel mbuf space
 165  *---------------------------------------------------------------------------*/
 166 struct mbuf*
 167 i4b_Bgetmbuf(int len)
 168 {
 169         struct mbuf *m;
 170
 171         if(len > MCLBYTES)      /* if length > max extension size */
 172         {
 173
 174 #ifdef I4B_MBUF_DEBUG
 175                 printf("i4b_getmbuf: error - len(%d) > MCLBYTES(%d)\n",
 176                                         len, MCLBYTES);
 177 #endif
 178
 179                 return(NULL);
 180         }
 181
 182         MGETHDR(m, M_DONTWAIT, MT_I4B_B);       /* get mbuf with pkthdr */
 183
 184         /* did we actually get the mbuf ? */
 185
 186         if(!m)
 187         {
 188
 189 #ifdef I4B_MBUF_DEBUG
 190                 printf("i4b_getbuf: error - MGETHDR failed!\n");
 191 #endif
 192
 193                 return(NULL);
 194         }
 195
 196         if(len >= MHLEN)
 197         {
 198                 MCLGET(m, M_DONTWAIT);
 199
 200                 if(!(m->m_flags & M_EXT))
 201                 {
 202                         m_freem(m);
 203
 204 #ifdef I4B_MBUF_DEBUG
 205                         printf("i4b_getbuf: error - MCLGET failed, len(%d)\n", len);
 206 #endif
 207
 208                         return (NULL);
 209                 }
 210         }
 211
 212         m->m_len = len;
 213
 214         return(m);
 215 }
 216
 217 /*---------------------------------------------------------------------------*
 218  *      free a B-channel mbuf
 219  *---------------------------------------------------------------------------*/
 220 void
 221 i4b_Bfreembuf(struct mbuf *m)
 222 {
 223         if(m)
 224                 m_freem(m);
 225 }
 226
 227 /*---------------------------------------------------------------------------*
 228  *      clear a B-channel ifqueue from data
 229  *---------------------------------------------------------------------------*/
 230 void
 231 i4b_Bcleanifq(struct ifqueue *ifq)
 232 {
 233         struct mbuf *m;
 234         int x = splnet();
 235
 236         while(!IF_QEMPTY(ifq))
 237         {
 238                 IF_DEQUEUE(ifq, m);
 239                 i4b_Bfreembuf(m);
 240         }
 241
 242         splx(x);
 243 }
 244
 245 /* EOF */