Ethernet.h

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/*
 * Copyright (C) 2003 Andras Varga; CTIE, Monash University, Australia
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/

#ifndef __INET_ETHERNET_H
#define __INET_ETHERNET_H

#include "INETDefs.h"

// Constants from the 802.3 spec
#define MAX_PACKETBURST              13
#define GIGABIT_MAX_BURST_BYTES      8192  /* don't start new frame after 8192 or more bytes already transmitted */
#define MAX_ETHERNET_DATA            1500  /* including LLC, SNAP etc headers */
#define MAX_ETHERNET_FRAME           1518  /* excludes preamble and SFD */
#define MIN_ETHERNET_FRAME           64    /* excludes preamble and SFD */
#define GIGABIT_MIN_FRAME_WITH_EXT   512 /* excludes preamble and SFD, but includes 448 byte extension */
#define INTERFRAME_GAP_BITS          96
#define ETHERNET_TXRATE              10000000.0    /* 10 Mbit/sec (in bit/s) */
#define FAST_ETHERNET_TXRATE         100000000.0   /* 100 Mbit/sec (in bit/s) */
#define GIGABIT_ETHERNET_TXRATE      1000000000.0  /* 1 Gbit/sec (in bit/s) */
#define FAST_GIGABIT_ETHERNET_TXRATE 10000000000.0 /* 10 Gbit/sec (in bit/s) */
#define SLOT_TIME                    (512.0/ETHERNET_TXRATE)  /* for Ethernet & Fast Ethernet, in seconds */
#define GIGABIT_SLOT_TIME            (4096.0/GIGABIT_ETHERNET_TXRATE) /* seconds */
#define MAX_ATTEMPTS                 16
#define BACKOFF_RANGE_LIMIT          10
#define JAM_SIGNAL_BYTES             4
#define PREAMBLE_BYTES               7
#define SFD_BYTES                    1
#define PAUSE_BITTIME                512 /* pause is in 512-bit-time units */

#define ETHER_MAC_FRAME_BYTES        (6+6+2+4) /* src(6)+dest(6)+length/type(2)+FCS(4) */
#define ETHER_LLC_HEADER_LENGTH      (3) /* ssap(1)+dsap(1)+control(1) */
#define ETHER_SNAP_HEADER_LENGTH     (5) /* org(3)+local(2) */
#define ETHER_PAUSE_COMMAND_BYTES    (6) /* FIXME verify */

#endif