target/linux/brcm47xx/patches-3.10/180-generate-mac-address.patch

   1 --- a/arch/mips/bcm47xx/sprom.c
   2 +++ b/arch/mips/bcm47xx/sprom.c
   3 @@ -28,6 +28,7 @@
   4
   5  #include <bcm47xx.h>
   6  #include <bcm47xx_nvram.h>
   7 +#include <linux/if_ether.h>
   8
   9  static void create_key(const char *prefix, const char *postfix,
  10                        const char *name, char *buf, int len)
  11 @@ -631,6 +632,33 @@ static void bcm47xx_fill_sprom_path_r45(
  12         }
  13  }
  14
  15 +static bool bcm47xx_is_valid_mac(u8 *mac)
  16 +{
  17 +       return mac && !(mac[0] == 0x00 && mac[1] == 0x90 && mac[2] == 0x4c);
  18 +}
  19 +
  20 +static int bcm47xx_increase_mac_addr(u8 *mac, u8 num)
  21 +{
  22 +       u8 *oui = mac + ETH_ALEN/2 - 1;
  23 +       u8 *p = mac + ETH_ALEN - 1;
  24 +
  25 +       do {
  26 +               (*p) += num;
  27 +               if (*p > num)
  28 +                       break;
  29 +               p--;
  30 +               num = 1;
  31 +       } while (p != oui);
  32 +
  33 +       if (p == oui) {
  34 +               pr_err("unable to fetch mac address\n");
  35 +               return -ENOENT;
  36 +       }
  37 +       return 0;
  38 +}
  39 +
  40 +static int mac_addr_used = 2;
  41 +
  42  static void bcm47xx_fill_sprom_ethernet(struct ssb_sprom *sprom,
  43                                         const char *prefix, bool fallback)
  44  {
  45 @@ -648,6 +676,23 @@ static void bcm47xx_fill_sprom_ethernet(
  46
  47         nvram_read_macaddr(prefix, "macaddr", sprom->il0mac, fallback);
  48         nvram_read_macaddr(prefix, "il0macaddr", sprom->il0mac, fallback);
  49 +
  50 +       /* The address prefix 00:90:4C is used by Broadcom in their initial
  51 +          configuration. When a mac address with the prefix 00:90:4C is used
  52 +          all devices from the same series are sharing the same mac address.
  53 +          To prevent mac address collisions we replace them with a mac address
  54 +          based on the base address. */
  55 +       if (!bcm47xx_is_valid_mac(sprom->il0mac)) {
  56 +               u8 mac[6];
  57 +               nvram_read_macaddr(NULL, "et0macaddr", mac, false);
  58 +               if (bcm47xx_is_valid_mac(mac)) {
  59 +                       int err = bcm47xx_increase_mac_addr(mac, mac_addr_used);
  60 +                       if (!err) {
  61 +                               memcpy(sprom->il0mac, mac, ETH_ALEN);
  62 +                               mac_addr_used++;
  63 +                       }
  64 +               }
  65 +       }
  66  }
  67
  68  static void bcm47xx_fill_board_data(struct ssb_sprom *sprom, const char *prefix,