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