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////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
// Filename:    manping.cpp
// Filename:    manping.cpp
//
//
// Project:     OpenArty, an entirely open SoC based upon the Arty platform
// Project:     OpenArty, an entirely open SoC based upon the Arty platform
//
//
// Purpose:     To command the network to ping a target.
// Purpose:     To command the network to ping a target.
//
//
//
//
// Creator:     Dan Gisselquist, Ph.D.
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Technology, LLC
//              Gisselquist Technology, LLC
//
//
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
//
//
// This program is free software (firmware): you can redistribute it and/or
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of  the GNU General Public License as published
// modify it under the terms of  the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
// your option) any later version.
//
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
// for more details.
//
//
// You should have received a copy of the GNU General Public License along
// You should have received a copy of the GNU General Public License along
// with this program.  (It's in the $(ROOT)/doc directory, run make with no
// with this program.  (It's in the $(ROOT)/doc directory, run make with no
// target there if the PDF file isn't present.)  If not, see
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
// <http://www.gnu.org/licenses/> for a copy.
//
//
// License:     GPL, v3, as defined and found on www.gnu.org,
// License:     GPL, v3, as defined and found on www.gnu.org,
//              http://www.gnu.org/licenses/gpl.html
//              http://www.gnu.org/licenses/gpl.html
//
//
//
//
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
//
//
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <unistd.h>
#include <unistd.h>
#include <strings.h>
#include <strings.h>
#include <ctype.h>
#include <ctype.h>
#include <string.h>
#include <string.h>
#include <signal.h>
#include <signal.h>
#include <assert.h>
#include <assert.h>
 
 
#include "port.h"
#include "port.h"
#include "regdefs.h"
#include "regdefs.h"
 
 
#define TXGO            0x04000
#define TXGO            0x04000
#define NOHWCRC         0x08000
#define NOHWCRC         0x08000
#define NOHWMAC         0x10000
#define NOHWMAC         0x10000
#define NETRESET        0x20000
#define NETRESET        0x20000
 
 
//
//
// Define DONT_INVERT for debugging only, as it will break the interface
// Define DONT_INVERT for debugging only, as it will break the interface
// test
// test
//
//
// #define      DONT_INVERT
// #define      DONT_INVERT
 
 
 
 
FPGA    *m_fpga;
FPGA    *m_fpga;
void    closeup(int v) {
void    closeup(int v) {
        m_fpga->kill();
        m_fpga->kill();
        exit(0);
        exit(0);
}
}
 
 
void    usage(void) {
void    usage(void) {
        printf("USAGE: manping EN:RX:xx:xx:xx:xx AR:TY:EN:TX:xx:xx de.st.ip.x ar.ty.ip.x\n");
        printf("USAGE: manping EN:RX:xx:xx:xx:xx AR:TY:EN:TX:xx:xx de.st.ip.x ar.ty.ip.x\n");
}
}
 
 
bool    strtoenetaddr(char *s, unsigned char *addr) {
bool    strtoenetaddr(char *s, unsigned char *addr) {
        char    *p, *c;
        char    *p, *c;
 
 
        p = s;
        p = s;
        addr[0] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        addr[0] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        c = strchr(p,':');
        c = strchr(p,':');
        if((!c) || ((c-p)>=3))
        if((!c) || ((c-p)>=3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[1] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        addr[1] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        c = strchr(p,':');
        c = strchr(p,':');
        if((!c) || ((c-p)>=3))
        if((!c) || ((c-p)>=3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[2] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        addr[2] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        c = strchr(p,':');
        c = strchr(p,':');
        if((!c) || ((c-p)>=3))
        if((!c) || ((c-p)>=3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[3] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        addr[3] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        c = strchr(p,':');
        c = strchr(p,':');
        if((!c) || ((c-p)>=3))
        if((!c) || ((c-p)>=3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[4] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        addr[4] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        c = strchr(p,':');
        c = strchr(p,':');
        if((!c) || ((c-p)>=3))
        if((!c) || ((c-p)>=3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[5] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
        addr[5] = (unsigned char)(strtoul(p, NULL, 16)&0x0ff);
 
 
        return true;
        return true;
}
}
 
 
bool    strtoinetaddr(char *s, unsigned char *addr) {
bool    strtoinetaddr(char *s, unsigned char *addr) {
        char    *p, *c;
        char    *p, *c;
 
 
        p = s;
        p = s;
        addr[0] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        addr[0] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        c = strchr(p,'.');
        c = strchr(p,'.');
        if((!c) || ((c-p)>3))
        if((!c) || ((c-p)>3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[1] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        addr[1] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        c = strchr(p,'.');
        c = strchr(p,'.');
        if((!c) || ((c-p)>3))
        if((!c) || ((c-p)>3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[2] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        addr[2] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        c = strchr(p,'.');
        c = strchr(p,'.');
        if((!c) || ((c-p)>3))
        if((!c) || ((c-p)>3))
                return false;
                return false;
 
 
        p = c+1;
        p = c+1;
        addr[3] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
        addr[3] = (unsigned char)(strtoul(p, NULL, 10)&0x0ff);
 
 
        return true;
        return true;
}
}
 
 
unsigned        calccrc(const int bytelen, const unsigned *buf) {
unsigned        calccrc(const int bytelen, const unsigned *buf) {
        const unsigned int      taps = 0xedb88320u;
        const unsigned int      taps = 0xedb88320u;
#ifdef  DONT_INVERT
#ifdef  DONT_INVERT
        unsigned int    crc = 0;
        unsigned int    crc = 0;
#else
#else
        unsigned int    crc = 0xffffffff; // initial value
        unsigned int    crc = 0xffffffff; // initial value
#endif
#endif
        int     bidx;
        int     bidx;
        int     bp = 0;
        int     bp = 0;
 
 
        for(bidx = 0; bidx<bytelen; bidx++) {
        for(bidx = 0; bidx<bytelen; bidx++) {
                if (bidx == 14)
                if (bidx == 14)
                        bidx+=2;
                        bidx+=2;
                unsigned char   byte = buf[(bidx>>2)]>>(24-((bidx&3)<<3));
                unsigned char   byte = buf[(bidx>>2)]>>(24-((bidx&3)<<3));
 
 
                // printf("CRC[%2d]: %02x ([%2d]0x%08x)\n", bidx, byte, (bidx>>2), buf[(bidx>>2)]);
                // printf("CRC[%2d]: %02x ([%2d]0x%08x)\n", bidx, byte, (bidx>>2), buf[(bidx>>2)]);
 
 
                for(int bit=8; --bit>= 0; byte >>= 1) {
                for(int bit=8; --bit>= 0; byte >>= 1) {
                        if ((crc ^ byte) & 1) {
                        if ((crc ^ byte) & 1) {
                                crc >>= 1;
                                crc >>= 1;
                                crc ^= taps;
                                crc ^= taps;
                        } else
                        } else
                                crc >>= 1;
                                crc >>= 1;
                } bp++;
                } bp++;
        }
        }
#ifndef DONT_INVERT
#ifndef DONT_INVERT
        crc ^= 0xffffffff;
        crc ^= 0xffffffff;
#endif
#endif
        // Now, we need to reverse these bytes
        // Now, we need to reverse these bytes
        // ABCD
        // ABCD
        unsigned a,b,c,d;
        unsigned a,b,c,d;
        a = (crc>>24); // &0x0ff;
        a = (crc>>24); // &0x0ff;
        b = (crc>>16)&0x0ff;
        b = (crc>>16)&0x0ff;
        c = (crc>> 8)&0x0ff;
        c = (crc>> 8)&0x0ff;
        d = crc; // (crc    )&0x0ff;
        d = crc; // (crc    )&0x0ff;
        crc = (d<<24)|(c<<16)|(b<<8)|a;
        crc = (d<<24)|(c<<16)|(b<<8)|a;
 
 
        // printf("%d bytes processed\n", bp);
        // printf("%d bytes processed\n", bp);
        return crc;
        return crc;
}
}
 
 
void    ipchecksum(unsigned *packet) {
void    ipchecksum(unsigned *packet) {
        int npkt = (packet[0]>>24)&0x0f;
        int npkt = (packet[0]>>24)&0x0f;
        unsigned checksum = 0;
        unsigned checksum = 0;
 
 
        packet[2] &= 0xffff0000;
        packet[2] &= 0xffff0000;
        printf("PKT[2] set to %08x\n", packet[2]);
        printf("PKT[2] set to %08x\n", packet[2]);
        printf("checksum = %08x\n", checksum);
        printf("checksum = %08x\n", checksum);
        for(int i=0; i<npkt; i++)
        for(int i=0; i<npkt; i++)
                checksum += packet[i] & 0x0ffff;
                checksum += packet[i] & 0x0ffff;
        printf("checksum = %08x\n", checksum);
        printf("checksum = %08x\n", checksum);
        for(int i=0; i<npkt; i++)
        for(int i=0; i<npkt; i++)
                checksum += (packet[i]>>16)&0x0ffff;
                checksum += (packet[i]>>16)&0x0ffff;
        printf("checksum = %08x\n", checksum);
        printf("checksum = %08x\n", checksum);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        packet[2] |= (checksum & 0x0ffff)^0x0ffff;
        packet[2] |= (checksum & 0x0ffff)^0x0ffff;
 
 
        printf("PKT[2] set to 0x%08x\n", packet[2]);
        printf("PKT[2] set to 0x%08x\n", packet[2]);
        checksum = 0;
        checksum = 0;
        for(int i=0; i<npkt; i++)
        for(int i=0; i<npkt; i++)
                checksum += packet[i] & 0x0ffff;
                checksum += packet[i] & 0x0ffff;
        for(int i=0; i<npkt; i++)
        for(int i=0; i<npkt; i++)
                checksum += (packet[i]>>16)&0x0ffff;
                checksum += (packet[i]>>16)&0x0ffff;
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum = (checksum & 0x0ffff) + (checksum >> 16);
        checksum ^= 0x0ffff;
        checksum ^= 0x0ffff;
 
 
        assert(checksum == 0);
        assert(checksum == 0);
}
}
 
 
void    clear_scope(FPGA *fpga) {
void    clear_scope(FPGA *fpga) {
        unsigned        scopev;
        unsigned        scopev;
 
 
        scopev = m_fpga->readio(R_NETSCOPE);
        scopev = m_fpga->readio(R_NETSCOPE);
        int delay = (scopev>>20)&0x0f;
        int delay = (scopev>>20)&0x0f;
        delay = (1<<(delay))-32;
        delay = (1<<(delay))-32;
        m_fpga->writeio(R_NETSCOPE, (delay));
        m_fpga->writeio(R_NETSCOPE, (delay));
}
}
 
 
int main(int argc, char **argv) {
int main(int argc, char **argv) {
        int     skp=0, port = FPGAPORT;
        int     skp=0, port = FPGAPORT;
        bool    config_hw_mac = true, config_hw_crc = true;
        bool    config_hw_mac = true, config_hw_crc = true;
        FPGA::BUSW      txstat;
        FPGA::BUSW      txstat;
        int     argn;
        int     argn;
        unsigned        checksum;
        unsigned        checksum;
        unsigned        urand[16], nu = 0;
        unsigned        urand[16], nu = 0;
 
 
        {
        {
                FILE *fp;
                FILE *fp;
                for(int i=0; i<16; i++)
                for(int i=0; i<16; i++)
                        urand[i] = rand();
                        urand[i] = rand();
 
 
                // Now, see if we can do better than the library random
                // Now, see if we can do better than the library random
                // number generator--but don't fail if we can't.
                // number generator--but don't fail if we can't.
                fp = fopen("/dev/urandom", "r");
                fp = fopen("/dev/urandom", "r");
                if (fp != NULL) {
                if (fp != NULL) {
                        int nr = fread(urand, sizeof(short), 16, fp);
                        int nr = fread(urand, sizeof(short), 16, fp);
                        fclose(fp);
                        fclose(fp);
                }
                }
        }
        }
 
 
 
 
        FPGAOPEN(m_fpga);
        FPGAOPEN(m_fpga);
 
 
        signal(SIGSTOP, closeup);
        signal(SIGSTOP, closeup);
        signal(SIGHUP, closeup);
        signal(SIGHUP, closeup);
 
 
        txstat = m_fpga->readio(R_NET_TXCMD);
        txstat = m_fpga->readio(R_NET_TXCMD);
 
 
        // Take the ethernet out of reset
        // Take the ethernet out of reset
        if ((txstat & NETRESET) != 0)
        if ((txstat & NETRESET) != 0)
                m_fpga->writeio(R_NET_TXCMD, (txstat &=(~NETRESET)));
                m_fpga->writeio(R_NET_TXCMD, (txstat &=(~NETRESET)));
 
 
        unsigned        packet[14];
        unsigned        packet[14];
 
 
        unsigned char   smac[6], dmac[6];
        unsigned char   smac[6], dmac[6];
        unsigned char   sip[4],  dip[4];
        unsigned char   sip[4],  dip[4];
 
 
        // I know the ethernet MAC of the computer I wish to test with
        // I know the ethernet MAC of the computer I wish to test with
        dmac[0] = 0xc8; dmac[1] = 0x3a; dmac[2] = 0x35;
        dmac[0] = 0xc8; dmac[1] = 0x3a; dmac[2] = 0x35;
        dmac[3] = 0xd2; dmac[4] = 0x07; dmac[5] = 0xb1;
        dmac[3] = 0xd2; dmac[4] = 0x07; dmac[5] = 0xb1;
        // And just something from /dev/urandom to create our source address
        // And just something from /dev/urandom to create our source address
        smac[0] = 0xd2; smac[1] = 0xd8; smac[2] = 0x28;
        smac[0] = 0xd2; smac[1] = 0xd8; smac[2] = 0x28;
        smac[3] = 0xe8; smac[4] = 0xb0; smac[5] = 0x96;
        smac[3] = 0xe8; smac[4] = 0xb0; smac[5] = 0x96;
 
 
        // Similarly with the destination IP of the computer I wish to test with
        // Similarly with the destination IP of the computer I wish to test with
        dip[0] = 192; dip[1] = 168; dip[2] = 10; dip[3] = 1;
        dip[0] = 192; dip[1] = 168; dip[2] = 10; dip[3] = 1;
        // and let's pick a source IP just ... somewhere on that network
        // and let's pick a source IP just ... somewhere on that network
        sip[0] = 192; sip[1] = 168; sip[2] = 10; sip[3] = 22;
        sip[0] = 192; sip[1] = 168; sip[2] = 10; sip[3] = 22;
 
 
        clear_scope(m_fpga);
        clear_scope(m_fpga);
 
 
        argn = 1;
        argn = 1;
 
 
        {
        {
                bool    bad_address = false;
                bool    bad_address = false;
                char    *badp = NULL;
                char    *badp = NULL;
                if ((argn<argc)&&(strchr(argv[argn], ':'))) {
                if ((argn<argc)&&(strchr(argv[argn], ':'))) {
                        if (!strtoenetaddr(argv[argn++], dmac)) {
                        if (!strtoenetaddr(argv[argn++], dmac)) {
                                badp = argv[argn-1];
                                badp = argv[argn-1];
                                bad_address = true;
                                bad_address = true;
                        } else if ((argn<argc)&&(strchr(argv[argn], ':'))) {
                        } else if ((argn<argc)&&(strchr(argv[argn], ':'))) {
                                if (!strtoenetaddr(argv[argn++], smac)) {
                                if (!strtoenetaddr(argv[argn++], smac)) {
                                        badp = argv[argn-1];
                                        badp = argv[argn-1];
                                        bad_address = true;
                                        bad_address = true;
                                }
                                }
                        }
                        }
                } if ((argn<argc)&&(!bad_address)&&(strchr(argv[argn], '.'))) {
                } if ((argn<argc)&&(!bad_address)&&(strchr(argv[argn], '.'))) {
                        if (!strtoinetaddr(argv[argn++], dip)) {
                        if (!strtoinetaddr(argv[argn++], dip)) {
                                badp = argv[argn-1];
                                badp = argv[argn-1];
                                bad_address = true;
                                bad_address = true;
                        } else if ((argn<argc)&&(strchr(argv[argn], '.'))) {
                        } else if ((argn<argc)&&(strchr(argv[argn], '.'))) {
                                if (!strtoinetaddr(argv[argn++], sip)) {
                                if (!strtoinetaddr(argv[argn++], sip)) {
                                        badp = argv[argn-1];
                                        badp = argv[argn-1];
                                        bad_address = true;
                                        bad_address = true;
                                }
                                }
                        }
                        }
                }
                }
 
 
                if (bad_address) {
                if (bad_address) {
                        usage();
                        usage();
                        fprintf(stderr, "ERR: could not comprehend address, %s\n", badp);
                        fprintf(stderr, "ERR: could not comprehend address, %s\n", badp);
                        exit(EXIT_FAILURE);
                        exit(EXIT_FAILURE);
                }
                }
        }
        }
 
 
        printf("Building packet\n");
        printf("Building packet\n");
        printf("From %3d.%3d.%3d.%3d [%02x:%02x:%02x:%02x:%02x:%02x]\n",
        printf("From %3d.%3d.%3d.%3d [%02x:%02x:%02x:%02x:%02x:%02x]\n",
                sip[0], sip[1], sip[2], sip[3],
                sip[0], sip[1], sip[2], sip[3],
                smac[0], smac[1], smac[2], smac[3], smac[4], smac[5]);
                smac[0], smac[1], smac[2], smac[3], smac[4], smac[5]);
        printf("To   %3d.%3d.%3d.%3d [%02x:%02x:%02x:%02x:%02x:%02x]\n",
        printf("To   %3d.%3d.%3d.%3d [%02x:%02x:%02x:%02x:%02x:%02x]\n",
                dip[0], dip[1], dip[2], dip[3],
                dip[0], dip[1], dip[2], dip[3],
                dmac[0], dmac[1], dmac[2], dmac[3], dmac[4], dmac[5]);
                dmac[0], dmac[1], dmac[2], dmac[3], dmac[4], dmac[5]);
 
 
 
 
        // Let's build ourselves a ping packet
        // Let's build ourselves a ping packet
        packet[ 0] = (dmac[0]<<24)|(dmac[1]<<16)|(dmac[2]<<8)|(dmac[3]);
        packet[ 0] = (dmac[0]<<24)|(dmac[1]<<16)|(dmac[2]<<8)|(dmac[3]);
        packet[ 1] = (dmac[4]<<24)|(dmac[5]<<16)|(smac[0]<<8)|(smac[1]);
        packet[ 1] = (dmac[4]<<24)|(dmac[5]<<16)|(smac[0]<<8)|(smac[1]);
        packet[ 2] = (smac[2]<<24)|(smac[3]<<16)|(smac[4]<<8)|(smac[5]);
        packet[ 2] = (smac[2]<<24)|(smac[3]<<16)|(smac[4]<<8)|(smac[5]);
        packet[ 3] = 0x08000800;
        packet[ 3] = 0x08000800;
        packet[ 4] = 0x4500001c; // IPv4, 20byte header, type of service = 0
        packet[ 4] = 0x4500001c; // IPv4, 20byte header, type of service = 0
        packet[ 5] = (urand[nu++]&0xffff0000); // Packet ID
        packet[ 5] = (urand[nu++]&0xffff0000); // Packet ID
        packet[ 6] = 0x80010000; // no flags, fragment offset=0, ttl=0, proto=1
        packet[ 6] = 0x80010000; // no flags, fragment offset=0, ttl=0, proto=1
        packet[ 7] = (sip[0]<<24)|(sip[1]<<16)|(sip[2]<<8)|(sip[3]);
        packet[ 7] = (sip[0]<<24)|(sip[1]<<16)|(sip[2]<<8)|(sip[3]);
        packet[ 8] = (dip[0]<<24)|(dip[1]<<16)|(dip[2]<<8)|(dip[3]);
        packet[ 8] = (dip[0]<<24)|(dip[1]<<16)|(dip[2]<<8)|(dip[3]);
        // Ping payload: type = 0x08 (PING, the response will be zero)
        // Ping payload: type = 0x08 (PING, the response will be zero)
        //      CODE = 0
        //      CODE = 0
        //      Checksum will be filled in later
        //      Checksum will be filled in later
        packet[ 9] = 0x08000000;
        packet[ 9] = 0x08000000;
        // This is the PING identifier and sequence number.  For now, we'll
        // This is the PING identifier and sequence number.  For now, we'll
        // just feed it random information--doesn't really matter what
        // just feed it random information--doesn't really matter what
        packet[10] = urand[nu++];
        packet[10] = urand[nu++];
        // Now, the minimum ethernet packet is 16 words.  So, let's flush
        // Now, the minimum ethernet packet is 16 words.  So, let's flush
        // ourselves out to that minimum length.
        // ourselves out to that minimum length.
        packet[11] = 0;
        packet[11] = 0;
        packet[12] = 0;
        packet[12] = 0;
        packet[13] = 0;
        packet[13] = 0;
        packet[14] = 0;
        packet[14] = 0;
 
 
        // Calculate the IP header checksum
        // Calculate the IP header checksum
        ipchecksum(&packet[4]);
        ipchecksum(&packet[4]);
 
 
        // Calculate the PING payload checksum
        // Calculate the PING payload checksum
        checksum  =  packet[ 9] & 0x0ffff;
        checksum  =  packet[ 9] & 0x0ffff;
        checksum += (packet[ 9]>>16)&0x0ffff;
        checksum += (packet[ 9]>>16)&0x0ffff;
        checksum +=  packet[10] & 0x0ffff;
        checksum +=  packet[10] & 0x0ffff;
        checksum += (packet[10]>>16)&0x0ffff;
        checksum += (packet[10]>>16)&0x0ffff;
        checksum  = ((checksum >> 16)&0x0ffff) + (checksum & 0x0ffff);
        checksum  = ((checksum >> 16)&0x0ffff) + (checksum & 0x0ffff);
        checksum  = ((checksum >> 16)&0x0ffff) + (checksum & 0x0ffff);
        checksum  = ((checksum >> 16)&0x0ffff) + (checksum & 0x0ffff);
        packet[ 9] = ((packet[9] & 0xffff0000)|(checksum))^0x0ffff;
        packet[ 9] = ((packet[9] & 0xffff0000)|(checksum))^0x0ffff;
 
 
        // Calculate the CRC--assuming we'll use it.
        // Calculate the CRC--assuming we'll use it.
        packet[15] = calccrc(15*4, packet);
        packet[15] = calccrc(15*4, packet);
 
 
        // Clear any/all pending receiving errors or packets
        // Clear any/all pending receiving errors or packets
        m_fpga->writeio(R_NET_RXCMD, 0x0fffff);
        m_fpga->writeio(R_NET_RXCMD, 0x0fffff);
        if (config_hw_mac) {
        if (config_hw_mac) {
                int ln;
                int ln;
 
 
                m_fpga->writeio(R_NET_MACHI, (smac[0]<<8)|(smac[1]));
                m_fpga->writeio(R_NET_MACHI, (smac[0]<<8)|(smac[1]));
                m_fpga->writeio(R_NET_MACLO, (smac[2]<<24)|(smac[3]<<16)|(smac[4]<<8)|(smac[5]));
                m_fpga->writeio(R_NET_MACLO, (smac[2]<<24)|(smac[3]<<16)|(smac[4]<<8)|(smac[5]));
 
 
                // Now, let's rebuild our packet for the non-hw-mac option,
                // Now, let's rebuild our packet for the non-hw-mac option,
                // now that we know the CRC.  In general, we're just going
                // now that we know the CRC.  In general, we're just going
                // to copy the packet we created earlier, but we need to
                // to copy the packet we created earlier, but we need to
                // shift things as we do so.
                // shift things as we do so.
                packet[ 0] = (dmac[0]<<24)|(dmac[1]<<16)|(dmac[2]<<8)|(dmac[3]);
                packet[ 0] = (dmac[0]<<24)|(dmac[1]<<16)|(dmac[2]<<8)|(dmac[3]);
                packet[ 1] = (dmac[4]<<24)|(dmac[5]<<16)|0x0800;
                packet[ 1] = (dmac[4]<<24)|(dmac[5]<<16)|0x0800;
                packet[ 2] = packet[ 4];
                packet[ 2] = packet[ 4];
                packet[ 3] = packet[ 5];
                packet[ 3] = packet[ 5];
                packet[ 4] = packet[ 6];
                packet[ 4] = packet[ 6];
                packet[ 5] = packet[ 7];
                packet[ 5] = packet[ 7];
                packet[ 6] = packet[ 8];
                packet[ 6] = packet[ 8];
                packet[ 7] = packet[ 9];
                packet[ 7] = packet[ 9];
                packet[ 8] = packet[10];
                packet[ 8] = packet[10];
                packet[ 9] = packet[11];
                packet[ 9] = packet[11];
                packet[10] = packet[12];
                packet[10] = packet[12];
                packet[11] = packet[13];
                packet[11] = packet[13];
                packet[12] = packet[14];
                packet[12] = packet[14];
                packet[13] = packet[15];
                packet[13] = packet[15];
 
 
                ln = (config_hw_crc)?9:14;
                ln = (config_hw_crc)?9:14;
                printf("Packet:\n");
                printf("Packet:\n");
                for(int i=0; i<14; i++)
                for(int i=0; i<14; i++)
                        printf("\t%2d: 0x%08x\n", i, packet[i]);
                        printf("\t%2d: 0x%08x\n", i, packet[i]);
 
 
                // Load the packet into the hardware buffer
                // Load the packet into the hardware buffer
                m_fpga->writei(R_NET_TXBUF, ln, packet);
                m_fpga->writei(R_NET_TXBUF, ln, packet);
 
 
                // And give it the transmit command.
                // And give it the transmit command.
                m_fpga->writeio(R_NET_TXCMD, TXGO|(ln<<2)|((config_hw_crc)?0:NOHWCRC));
                { unsigned cmd;
 
                cmd = TXGO|(ln<<2)|((config_hw_crc)?0:NOHWCRC);
 
                m_fpga->writeio(R_NET_TXCMD, cmd);
 
                printf("Sent TX command: 0x%x\n", cmd);
 
                }
 
 
        } else {
        } else {
                int     ln;
                int     ln;
 
 
                ln = (config_hw_crc)?11:12;
                ln = (config_hw_crc)?11:12;
                printf("Packet:\n");
                printf("Packet:\n");
                for(int i=0; i<15; i++)
                for(int i=0; i<15; i++)
                        printf("\t%3d: 0x%08x\n", i, packet[i]);
                        printf("\t%3d: 0x%08x\n", i, packet[i]);
                printf("\tCRC: 0x%08x\n", packet[15]);
                printf("\tCRC: 0x%08x\n", packet[15]);
 
 
                // Load the packet into the hardware buffer
                // Load the packet into the hardware buffer
                m_fpga->writei(R_NET_TXBUF, ln, packet);
                m_fpga->writei(R_NET_TXBUF, ln, packet);
 
 
                // And give it the transmit command
                // And give it the transmit command
                m_fpga->writeio(R_NET_TXCMD, TXGO|NOHWMAC|(ln<<2)|((config_hw_crc)?0:NOHWCRC));
                m_fpga->writeio(R_NET_TXCMD, TXGO|NOHWMAC|(ln<<2)|((config_hw_crc)?0:NOHWCRC));
        }
        }
 
 
        // First, we need to look for any ARP requests, and we'll need to
        // First, we need to look for any ARP requests, and we'll need to
        // respond to them.  If during this time we get a ping response
        // respond to them.  If during this time we get a ping response
        // packet, we're done.
        // packet, we're done.
 
 
        printf("\nLooking for a response ...\n");
        printf("\nLooking for a response ...\n");
        unsigned rxstat;
        unsigned rxstat;
        int     errcount = 0;
        int     errcount = 0;
        do {
        do {
                rxstat = m_fpga->readio(R_NET_RXCMD);
                rxstat = m_fpga->readio(R_NET_RXCMD);
                if (rxstat & 0x04000) {
                if (rxstat & 0x04000) {
                        int     rxlen;
                        int     rxlen;
                        unsigned *buf;
                        unsigned *buf;
                        printf("RX Status = %08x\n", rxstat);
                        printf("RX Status = %08x\n", rxstat);
                        rxlen = ((rxstat & 0x03fff)+3)>>2;
                        rxlen = ((rxstat & 0x03fff)+3)>>2;
                        buf = new unsigned[rxlen];
                        buf = new unsigned[rxlen];
                        m_fpga->readi(R_NET_RXBUF, rxlen, buf);
                        m_fpga->readi(R_NET_RXBUF, rxlen, buf);
                        for(int i=0; i<rxlen; i++)
                        for(int i=0; i<rxlen; i++)
                                printf("\tRX[%2d]: 0x%08x\n", i, buf[i]);
                                printf("\tRX[%2d]: 0x%08x\n", i, buf[i]);
                        delete[] buf;
                        delete[] buf;
                        m_fpga->writeio(R_NET_RXCMD, 0xffffff);
                        // m_fpga->writeio(R_NET_RXCMD, 0xffffff);
                        break;
                        break;
                }
                }
        } while(((rxstat & 0x04000)==0)&&(errcount++ < 50));
        } while(((rxstat & 0x04000)==0)&&(errcount++ < 500));
 
 
        rxstat = m_fpga->readio(R_NET_RXCMD);
        rxstat = m_fpga->readio(R_NET_RXCMD);
        printf("Final Rx Status = %08x\n", rxstat);
        printf("Final Rx Status = %08x\n", rxstat);
 
 
 
 
        delete  m_fpga;
        delete  m_fpga;
}
}
 
 
 
 

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