/*
   * INET		An implementation of the TCP/IP protocol suite for the LINUX
   *		operating system.  INET is implemented using the  BSD Socket
   *		interface as the means of communication with the user level.
   *
   *		Global definitions for the Token-Ring IEEE 802.5 interface.
   *
   * Version:	@(#)if_tr.h	0.0	07/11/94
   *
   * Author:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
   *		Donald Becker, <becker@super.org>

   *		Peter De Schrijver, <stud11@cc4.kuleuven.ac.be>

   *
   *		This program is free software; you can redistribute it and/or
   *		modify it under the terms of the GNU General Public License
   *		as published by the Free Software Foundation; either version
   *		2 of the License, or (at your option) any later version.
   */
  #ifndef _LINUX_IF_TR_H
  #define _LINUX_IF_TR_H

  #include <linux/types.h>

  #include <asm/byteorder.h>	/* For __be16 */

  /* IEEE 802.5 Token-Ring magic constants.  The frame sizes omit the preamble
     and FCS/CRC (frame check sequence). */

  #define TR_ALEN		6		/* Octets in one token-ring addr */
  #define TR_HLEN 	(sizeof(struct trh_hdr)+sizeof(struct trllc))
  #define AC		0x10
  #define LLC_FRAME 	0x40

  
  /* LLC and SNAP constants */

  #define EXTENDED_SAP 	0xAA
  #define UI_CMD       	0x03

  
  /* This is an Token-Ring frame header. */
  struct trh_hdr {
  	__u8  ac;			/* access control field */
  	__u8  fc;			/* frame control field */
  	__u8  daddr[TR_ALEN];		/* destination address */
  	__u8  saddr[TR_ALEN];		/* source address */

  	__be16 rcf;			/* route control field */
  	__be16 rseg[8];			/* routing registers */

  };
  
  #ifdef __KERNEL__
  #include <linux/skbuff.h>
  
  static inline struct trh_hdr *tr_hdr(const struct sk_buff *skb)
  {

  	return (struct trh_hdr *)skb_mac_header(skb);

  }
  #endif
  
  /* This is an Token-Ring LLC structure */
  struct trllc {
  	__u8  dsap;			/* destination SAP */
  	__u8  ssap;			/* source SAP */
  	__u8  llc;			/* LLC control field */
  	__u8  protid[3];		/* protocol id */

  	__be16 ethertype;		/* ether type field */

  };
  
  /* Token-Ring statistics collection data. */
  struct tr_statistics {
  	unsigned long rx_packets;       /* total packets received	*/
  	unsigned long tx_packets;	/* total packets transmitted	*/
  	unsigned long rx_bytes;		/* total bytes received   	*/
  	unsigned long tx_bytes;		/* total bytes transmitted	*/
  	unsigned long rx_errors;	/* bad packets received		*/
  	unsigned long tx_errors;	/* packet transmit problems	*/
  	unsigned long rx_dropped;	/* no space in linux buffers	*/
  	unsigned long tx_dropped;	/* no space available in linux	*/
  	unsigned long multicast;	/* multicast packets received	*/
  	unsigned long transmit_collision;
  
  	/* detailed Token-Ring errors. See IBM Token-Ring Network
  	   Architecture for more info */
  
  	unsigned long line_errors;
  	unsigned long internal_errors;
  	unsigned long burst_errors;
  	unsigned long A_C_errors;
  	unsigned long abort_delimiters;
  	unsigned long lost_frames;
  	unsigned long recv_congest_count;
  	unsigned long frame_copied_errors;
  	unsigned long frequency_errors;
  	unsigned long token_errors;
  	unsigned long dummy1;
  };
  
  /* source routing stuff */

  #define TR_RII 			0x80
  #define TR_RCF_DIR_BIT 		0x80
  #define TR_RCF_LEN_MASK 	0x1f00
  #define TR_RCF_BROADCAST 	0x8000	/* all-routes broadcast */
  #define TR_RCF_LIMITED_BROADCAST 0xC000	/* single-route broadcast */
  #define TR_RCF_FRAME2K 		0x20
  #define TR_RCF_BROADCAST_MASK 	0xC000
  #define TR_MAXRIFLEN 		18

  
  #endif	/* _LINUX_IF_TR_H */