Re: R10k O2

[Martin Husemann <martin%duskware.de@localhost>]

On Mon, Feb 25, 2008 at 09:32:52PM +0100, Martin Husemann wrote:
> Nope, it doesn't (or better: they don't persist). I'll borrow some code
> to create a random mac id from tap(4).

Hmm, the tap(4) strategy does not work very well (uptime too short and
deterministic) - I cam up with the evil hack below.

Martin

Index: if_mec.c
===================================================================
RCS file: /cvsroot/src/sys/arch/sgimips/mace/if_mec.c,v
retrieving revision 1.17
diff -c -u -r1.17 if_mec.c
--- if_mec.c    26 Jan 2008 14:28:49 -0000      1.17
+++ if_mec.c    25 Feb 2008 21:39:28 -0000
@@ -452,7 +452,41 @@
                printf(": unable to get MAC address!\n");
                goto fail_4;
        }
-       enaddr_aton(macaddr, sc->sc_enaddr);
+       /*
+        * On some machines the DS2502 chip storing the serial number/
+        * mac address is on the pci riser board - if this board is
+        * missing, ARCBIOS will not know a good ethernet address (but
+        * otherwise the machine will work fine).
+        */
+       if (strcmp(macaddr, "ff:ff:ff:ff:ff:ff") == 0) {
+               uint32_t ui = 0;
+               const char * netaddr =
+                       ARCBIOS->GetEnvironmentVariable("netaddr");
+
+               /*
+                * Create a MAC address by abusing the "netaddr" env var
+                */
+               sc->sc_enaddr[0] = 0xf2;
+               sc->sc_enaddr[1] = 0x0b;
+               sc->sc_enaddr[2] = 0xa4;
+               if (netaddr) {
+                       while (*netaddr) {
+                               int v = 0;
+                               while (*netaddr && *netaddr != '.') {
+                                       if (*netaddr >= '0' && *netaddr <= '9')
+                                               v = v*10 + (*netaddr - '0');
+                                       netaddr++;
+                               }
+                               ui <<= 8;
+                               ui |= v;
+                               if (*netaddr == '.')
+                                       netaddr++;
+                       }
+               }
+               memcpy(sc->sc_enaddr+3, (u_int8_t *)&ui, 3);
+       } else {
+               enaddr_aton(macaddr, sc->sc_enaddr);
+       }
 
        /* set the Ethernet address */
        address = 0;