drivers/net/fddi/skfp/h/mbuf.h

   1 /******************************************************************************
   2  *
   3  *      (C)Copyright 1998,1999 SysKonnect,
   4  *      a business unit of Schneider & Koch & Co. Datensysteme GmbH.
   5  *
   6  *      This program is free software; you can redistribute it and/or modify
   7  *      it under the terms of the GNU General Public License as published by
   8  *      the Free Software Foundation; either version 2 of the License, or
   9  *      (at your option) any later version.
  10  *
  11  *      The information in this file is provided "AS IS" without warranty.
  12  *
  13  ******************************************************************************/
  14
  15 #ifndef _MBUF_
  16 #define _MBUF_
  17
  18 #define M_SIZE  4504
  19
  20 #ifndef MAX_MBUF
  21 #define MAX_MBUF        4
  22 #endif
  23
  24 #ifndef NO_STD_MBUF
  25 #define sm_next         m_next
  26 #define sm_off          m_off
  27 #define sm_len          m_len
  28 #define sm_data         m_data
  29 #define SMbuf           Mbuf
  30 #define mtod            smtod
  31 #define mtodoff         smtodoff
  32 #endif
  33
  34 struct s_mbuf {
  35         struct s_mbuf   *sm_next ;              /* low level linked list */
  36         short           sm_off ;                        /* offset in m_data */
  37         u_int           sm_len ;                        /* len of data */
  38 #ifdef  PCI
  39         int             sm_use_count ;
  40 #endif
  41         char            sm_data[M_SIZE] ;
  42 } ;
  43
  44 typedef struct s_mbuf SMbuf ;
  45
  46 /* mbuf head, to typed data */
  47 #define smtod(x,t)      ((t)((x)->sm_data + (x)->sm_off))
  48 #define smtodoff(x,t,o) ((t)((x)->sm_data + (o)))
  49
  50 #endif  /* _MBUF_ */