69 lines
1.8 KiB
Diff
69 lines
1.8 KiB
Diff
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--- a/arch/mips/bcm47xx/sprom.c
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+++ b/arch/mips/bcm47xx/sprom.c
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@@ -28,6 +28,7 @@
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#include <bcm47xx.h>
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#include <bcm47xx_nvram.h>
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+#include <linux/if_ether.h>
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static void create_key(const char *prefix, const char *postfix,
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const char *name, char *buf, int len)
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@@ -631,6 +632,33 @@ static void bcm47xx_fill_sprom_path_r45(
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}
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}
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+static bool bcm47xx_is_valid_mac(u8 *mac)
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+{
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+ return !(mac[0] == 0x00 && mac[1] == 0x90 && mac[2] == 0x4c);
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+}
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+
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+static int bcm47xx_increase_mac_addr(u8 *mac, u8 num)
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+{
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+ u8 *oui = mac + ETH_ALEN/2 - 1;
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+ u8 *p = mac + ETH_ALEN - 1;
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+
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+ do {
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+ (*p) += num;
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+ if (*p > num)
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+ break;
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+ p--;
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+ num = 1;
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+ } while (p != oui);
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+
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+ if (p == oui) {
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+ pr_err("unable to fetch mac address\n");
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+ return -ENOENT;
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+ }
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+ return 0;
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+}
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+
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+static int mac_addr_used = 1;
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+
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static void bcm47xx_fill_sprom_ethernet(struct ssb_sprom *sprom,
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const char *prefix, bool fallback)
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{
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@@ -648,6 +676,23 @@ static void bcm47xx_fill_sprom_ethernet(
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nvram_read_macaddr(prefix, "macaddr", sprom->il0mac, fallback);
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nvram_read_macaddr(prefix, "il0macaddr", sprom->il0mac, fallback);
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+
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+ /* The address prefix 00:90:4C is used by Broadcom in their initial
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+ configuration. When a mac address with the prefix 00:90:4C is used
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+ all devices from the same series are sharing the same mac address.
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+ To prevent mac address collisions we replace them with a mac address
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+ based on the base address. */
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+ if (!bcm47xx_is_valid_mac(sprom->il0mac)) {
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+ u8 mac[6];
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+ nvram_read_macaddr(NULL, "et0macaddr", mac, false);
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+ if (bcm47xx_is_valid_mac(mac)) {
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+ int err = bcm47xx_increase_mac_addr(mac, mac_addr_used);
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+ if (!err) {
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+ memcpy(sprom->il0mac, mac, ETH_ALEN);
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+ mac_addr_used++;
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+ }
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+ }
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+ }
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}
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static void bcm47xx_fill_board_data(struct ssb_sprom *sprom, const char *prefix,
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