Subversion Repositories fade_ether_protocol

/*

 * fpga_l3_fade - driver for L3 communication protocol with FPGA based system

 * Copyright (C) 2012 by Wojciech M. Zabolotny

 * Institute of Electronic Systems, Warsaw University of Technology

 *

 *  This code is PUBLIC DOMAIN

 */

#include<termios.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <sys/mman.h>

#include <sys/ioctl.h>

#include <fcntl.h>

#include <poll.h>

#include <unistd.h>

#include <stdio.h>

#include <strings.h>

#include <stdlib.h>

#include <stdint.h>

#include <sys/socket.h>

#include <linux/serial.h>

#include <sched.h>

#include "fpga_l3_fade.h"

#include <sys/time.h>

void main(int argc, char * argv[])

{

  int active[3]={0,0,0};

  struct l3_v1_buf_pointers bp;

  struct l3_v1_slave sl[3] = {

    {

      .mac = {0xde, 0xad, 0xba, 0xbe, 0xbe,0xef},

      .devname = "eth0"

    },

    {

      .mac = {0xde, 0xad, 0xba, 0xbe, 0xbe,0xe1},

      .devname = "eth0"

    },

    {

      .mac = {0xde, 0xad, 0xba, 0xbe, 0xbe,0xe2},

      .devname = "eth0"

    }

   };

  int i,j;

  int res;

  int blen[3];

  uint32_t data[3] = {0,0,0};

  long long total_len[3]={0,0,0};

  unsigned char * v[3];

  int frs[3]={-1,-1,-1};

  struct timeval tv;

  double tstart=0.0 , tend=0.0;

  int stop;

  struct sched_param s;

  s.sched_priority = 90;

  //Read active channels

  for(i=1;i<argc;i++) {

    int n = atoi(argv[i]);

    if ((n>=0) && (n<=2))

      active[n]=1;

  }

  printf("sched=%d\n",sched_setscheduler(0,SCHED_RR,&s));

  //Prepare all slaves to work

  for(i=0;i<3;i++) {

    char devname[30];

    sprintf(devname,"/dev/l3_fpga%d",i);

    frs[i]=open(devname,O_RDONLY);

    if(frs[i]<0) {

      printf("I can't open device %s\b",devname);

      perror("");

      exit(1);

    }

    //Get the length of the buffer

    blen[i] = ioctl(frs[i],L3_V1_IOC_GETBUFLEN,NULL);

    //Set the wakeup threshold

    res=ioctl(frs[i],L3_V1_IOC_SETWAKEUP,2000000);

    printf("length of buffer: %d, result of set wakeup: %d\n",blen[i],res);

    v[i]=(unsigned char *)mmap(0,blen[i],PROT_READ,MAP_PRIVATE,frs[i],0);

    if(!v[i]) {

      printf("mmap for device %s failed\n",devname);

      exit(1);

    }

  }

  //Start the transmission

  gettimeofday(&tv, NULL);

  tstart=tv.tv_sec+1.0e-6*tv.tv_usec;

  stop=tv.tv_sec+300;

  for(i=0;i<=2;i++) {

    if(active[i]) {

       res = ioctl(frs[i],L3_V1_IOC_STARTMAC,&sl[i]);

       printf("Result of start for slave %d : %d\n",i,res);

       }

  }

  int first_served=0;

  do{

    struct pollfd pfd[3] = {{.fd = frs[0], .events = POLLIN, .revents = 0},

                            {.fd = frs[1], .events = POLLIN, .revents = 0},

                            {.fd = frs[2], .events = POLLIN, .revents = 0},

                           };

    int ptr=0;

    int len=0;

    int pres;

    //Wait for data using "poll"

    pres = poll(pfd,3,-1);

    if(pres<0) {

      perror("Error in poll:");

      exit(1);

    }

    first_served = (first_served+1) %3; //Rotate priority of slaves

    for(j=0;j<3;j++) {

      i=(j+first_served) % 3;

      if(pfd[i].revents) {

        len = ioctl(frs[i],L3_V1_IOC_READPTRS,&bp);

        total_len[i] += len;

        printf("i=%d len=%d total=%lld head:%d tail: %d\n",i,len,total_len[i],bp.head, bp.tail);

        //OK. The data are read, let's analyze them

        while (bp.head != bp.tail)  {

          uint32_t c;

          c = *(uint32_t *)(v[i]+bp.tail);

          c = ntohl(c);

          bp.tail=(bp.tail+4) & (blen[i]-1); //Adjust tail pointer modulo blen[i]-1

          if (__builtin_expect((c != data[i]), 0)) {

            printf("Error! received: %8.8x expected: %8.8x \n",c,data[i]);

            exit(1);

          }

          data[i] ++;

        }

        ioctl(frs[i],L3_V1_IOC_WRITEPTRS,len);

      }

    }

    fflush(stdout);

    gettimeofday(&tv, NULL);

    if(tv.tv_sec > stop) {

      tend=tv.tv_sec+1.0e-6*tv.tv_usec;

      break;

    }

  } while (1);

  tend=tend-tstart;

  fprintf(stderr,"act0:%d act1:%d act2:%d\n",active[0],active[1],active[2]);

  for(i=0;i<3;i++) {

     fprintf(stderr,"total data %d=%lld time=%g throughput=%g [Mb/s]\n",i,total_len[i], tend, total_len[i]/tend*8.0);

  }

  for(i=0;i<=2;i++) {

    res = ioctl(frs[i],L3_V1_IOC_STOPMAC,0);

    munmap(v[i],blen[i]);

    close(frs[i]);

  }

}