rtfifoif.c

最新rtlinux内核源码

/*
 * Copyright (c) 2001, Swedish Institute of Computer Science.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 *
 */

/*********************************************************************************/
/* This file is based in one file part of the lwIP TCP/IP stack. The file is:    */
/* ethernetif.c                                                                  */
/* which author is: Adam Dunkels <[e-mail]>                                  */
/*                                                                               */
/* This file has been modified by Sergio Perez Alca駃z <[e-mail]>   */
/*            Departamento de Inform醫ica de Sistemas y Computadores             */
/*            Universidad Polit閏nica de Valencia                                */
/*            Valencia (Spain)                                                   */
/*                                                                               */
/* The RTL-lwIP project has been supported by the Spanish Government Research    */
/* Office (CICYT) under grant TIC2002-04123-C03-03                               */
/*                                                                               */
/* Copyright (c) March, 2003 SISTEMAS DE TIEMPO REAL EMPOTRADOS, FIABLES Y       */
/* DISTRIBUIDOS BASADOS EN COMPONENTES                                           */
/*                                                                               */
/*  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.                                          */
/*                                                                               */
/*  This program is distributed in the hope that it will be useful,              */
/*  but WITHOUT ANY WARRANTY; without even the implied warrabnty of              */
/*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                */
/*  GNU General Public License for more details.                                 */
/*                                                                               */
/*  You should have received a copy of the GNU General Public License            */
/*  along with this program; if not, write to the Free Software                  */
/*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA    */
/*                                                                               */
/*  Linking RTL-lwIP statically or dynamically with other modules is making a    */
/*  combined work based on RTL-lwIP.  Thus, the terms and conditions of the GNU  */
/*  General Public License cover the whole combination.                          */
/*                                                                               */
/*  As a special exception, the copyright holders of RTL-lwIP give you           */
/*  permission to link RTL-lwIP with independent modules that communicate with   */
/*  RTL-lwIP solely through the interfaces, regardless of the license terms of   */
/*  these independent modules, and to copy and distribute the resulting combined */
/*  work under terms of your choice, provided that every copy of the combined    */
/*  work is accompanied by a complete copy of the source code of RTL-lwIP (the   */
/*  version of RTL-lwIP used to produce the combined work), being distributed    */
/*  under the terms of the GNU General Public License plus this exception.  An   */
/*  independent module is a module which is not derived from or based on         */
/*  RTL-lwIP.                                                                    */
/*                                                                               */
/*  Note that people who make modified versions of RTL-lwIP are not obligated to */
/*  grant this special exception for their modified versions; it is their choice */
/*  whether to do so.  The GNU General Public License gives permission to        */
/*  release a modified version without this exception; this exception also makes */
/*  it possible to release a modified version which carries forward this         */
/*  exception.                                                                   */
/*********************************************************************************/

#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/ip.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"
#include "bcopy.h"
#include "netif/arp.h"
#include <time.h>
#include <rtl_sched.h>
#include <rtl_fifo.h>

#ifdef __RTFIFOOPTS__

#define DEVWRITE "/dev/rtf0"
#define DEVREAD "/dev/rtf1"

#define IFNAME0 'r'
#define IFNAME1 't'

#define SETBYTEONE(a,b) (a=(b & 0x000F))
#define SETBYTETWO(a,b) (a=(b & 0x00F0)) 
#define SETBYTETHREE(a,b) (a=(b & 0x0F00))
#define SETBYTEFOUR(a,b) (a=(b & 0xF000))

static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};

struct rtfifoif {
  struct eth_addr *ethaddr;
  int writefd;
  int readfd;
};

/* Forward declarations. */
static void  rtfifoif_input(struct netif *netif);
static err_t rtfifoif_output(struct netif *netif, struct pbuf *p, struct ip_addr *ipaddr);
static void rtfifoif_thread(void *arg);

/*-----------------------------------------------------------------------------------*/
static void
low_level_init(struct netif *netif)
{
  struct rtfifoif *rtfifoif;
  rtfifoif = netif->state;
  
  /* Obtain MAC address from network interface. */
  string2mac(rtfifoif->ethaddr,RTFIFO_MAC);

  /* We use RTfifo 0 for writing */
  rtfifoif->writefd = 0;
  /* We use RTfifo 1 for reading */
  rtfifoif->readfd = 1;

  sys_thread_new(rtfifoif_thread, netif, RTFIFO_THREAD_PERIOD);

}

/*-----------------------------------------------------------------------------------*/
static void 
rtfifoif_thread(void *arg){
  struct netif *netif;
  struct rtfifoif *rtfifoif;
 
  netif = arg;
  rtfifoif = netif->state;
  
  while(1) {
    pthread_wait_np();
    /* Wait for a packet to arrive. */
    while(rtf_isempty(rtfifoif->readfd)){
      usleep(RTFIFO_DELAY);
    }
	  
    /* Handle incoming packet. */
    rtfifoif_input(netif);
  }
}

/*-----------------------------------------------------------------------------------*/
/*
 * low_level_output():
 *
 * Should do the actual transmission of the packet. The packet is
 * contained in the pbuf that is passed to the function. This pbuf
 * might be chained.
 *
 */
/*-----------------------------------------------------------------------------------*/
static err_t
low_level_output(struct rtfifoif *rtfifoif, struct pbuf *p)
{
  struct pbuf *q;
  char buf[1500];
  char *bufptr;
  unsigned char size_of_packet[4];
  
  /* initiate transfer(); */
  
  bufptr = &buf[0];
  
  for(q = p; q != NULL; q = q->next) {
    /* Send the data from the pbuf to the interface, one pbuf at a
       time. The size of the data in each pbuf is kept in the ->len
       variable. */    
    /* send data from(q->payload, q->len); */
    bcopy(q->payload, bufptr, q->len);
    bufptr += q->len;
  }
  
  SETBYTEONE(size_of_packet[0],p->tot_len);
  SETBYTETWO(size_of_packet[1],p->tot_len); 
  SETBYTETHREE(size_of_packet[2],p->tot_len);
  SETBYTEFOUR(size_of_packet[3],p->tot_len);

  if(rtf_put(rtfifoif->writefd, &size_of_packet, 4) == -1) {
    rtl_printf("low_level_output: rtf_put error");
  }else{
    if(rtf_put(rtfifoif->writefd, buf, p->tot_len) == -1) {
      rtl_printf("low_level_output: rtf_put error");
    }
  }
  
  return ERR_OK;
}
/*-----------------------------------------------------------------------------------*/
/*
 * low_level_input():
 *
 * Should allocate a pbuf and transfer the bytes of the incoming
 * packet from the interface into the pbuf.
 *
 */
/*-----------------------------------------------------------------------------------*/
static struct pbuf *
low_level_input(struct rtfifoif *rtfifoif)
{
  struct pbuf *p, *q;
  u16_t len;