Hello,
I'm trying to write an U-Boot command to ping the other interface on my
platform. This is to test the hardware at production, the ping must hit the
wire. I got deeply inspired from this patch:
http://lists.denx.de/pipermail/u-boot/2005-March/009317.html
What changes is that I really want to ping the other interface with a cross
cable and not using a special "home made" device ... The problem is when I send
the ping, it is the same interface that answers (the one that sent the ping),
this is not what I want. I thought by changing the destination MAC address in
the packet and initializing it, the other interface should answer by itself.
Actually this is not the case...
I know a lot of improvement can be done but at the moment I just trying to make
it work, this is why I let a lot of "debug" code and messages...
------------------ Here is some code I wrote in net/net.c ------------------
void
NetReceive(volatile uchar * inpkt, int len)
{
...
switch (x) {
case PROT_ARP:
...
case PROT_TEST:
answerToEthloopTest(pkt, et->et_dest, et->et_src, len);
break;
...
}
/* Prepare and send packet ... */
int EthLoopSend(void)
{
int i;
uchar *pkt;
struct eth_device* thisEth = eth_get_dev_by_index(eth_get_dev_index());
struct eth_device* other = thisEth->next;
bd_t *bd = gd->bd;
/* Choose the destination interface */
if(other->init(other, bd)){
printf("Couldn't initialize other interface, cannot perform test
!\n");
return -1;
}
printf("Using %s as destination device\n", other->name);
for (i=12 ; i<ETHLOOP_LEN ; i++) {
EtherPacket[i] = i;
}
/* set the other interface's MAC address as destination address */
pkt = (uchar *)EtherPacket;
pkt += NetSetEther (pkt, other->enetaddr, PROT_TEST);
(void) eth_send(EtherPacket, ETHLOOP_LEN);
return 1; /* waiting */
}
/* When no answer arrives ... */
static void EthLoopTimeout (void)
{
eth_halt();
NetState = NETLOOP_FAIL; /* we did not get the reply */
}
/* The other interface answers here */
static void answerToEthloopTest(uchar *pkt, unsigned dest, unsigned src,
unsigned len){
int i;
uchar tmp;
pkt = (uchar *)EtherPacket;
printf("Device %s answers ...\n", eth_get_name()); =======>>>> Why is it
ETSEC 0 ??!
// Reverse src dest MAC
for(i = 1 ; i < 6 ; i++){
tmp = EtherPacket[i];
EtherPacket[i] = EtherPacket[i + 6];
EtherPacket[i + 6] = tmp;
}
(void)eth_send(EtherPacket, ETHLOOP_LEN);
eth_get_dev()->halt(eth_get_dev());
}
/* When the source interface got an answer */
static void EthLoopHandler (uchar * pkt, unsigned dest, unsigned src, unsigned
len)
{
int i = 12;
pkt = (uchar *)EtherPacket;
for(i ; i < len ; i++){
printf("Comparing %i with %i at index %i", pkt[i], i, i);
if(pkt[i] != i){
NetState = NETLOOP_FAIL;
break;
}
}
}
/* Initialize the loop test */
static void EthLoopStart(void)
{
printf ("Using %s as source device\n", eth_get_name());
NetSetTimeout (2000, EthLoopTimeout);
NetSetHandler (EthLoopHandler);
EthLoopSend();
}
-------------------------- Here is the output
--------------------------------------
IPSniffer=> ethloop
Speed: 10, half duplex
Using eTSEC0 as source device
Speed: 10, half duplex
Using eTSEC1 as destination device
Device eTSEC0 answers ... ========> NO I WANT ETSEC1 !!!!
loopback test failed
I checked with Wireshark, the packet is correctly build. Maybe my approach is
flawed ! Or maybe do you have another way to perform that kind of test ?
Thanks !
Guy Morand
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