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broadcom-wl: fixup mac addresses.

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Some series of devices are using the same mac address, which causes
conflicts for these devices we generate a new mac address based on the
base address. This patch adds this functionality to braodcom-wl.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 41514
This commit is contained in:
Hauke Mehrtens
2014-07-05 19:23:40 +00:00
parent 3fff38f93a
commit 817c56f77c
1 changed files with 92 additions and 0 deletions
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92
package/kernel/broadcom-wl/patches/120-fixup-mac-addresses.patch Normal file
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@@ -0,0 +1,92 @@
--- a/driver/nvram_stub.c
+++ b/driver/nvram_stub.c
@@ -5,6 +5,7 @@
#include <siutils.h>
#include <bcmendian.h>
#include <bcmnvram.h>
+#include <proto/ethernet.h>
#ifdef BCMDBG_ERR
#define NVR_MSG(x) printf x
@@ -24,6 +25,7 @@ typedef struct _vars {
static vars_t *vars = NULL;
static int nvram_init_done = 0;
extern char *nvram_buf[];
+static void fixup_mac_addr(vars_t *new);
int
BCMATTACHFN(nvram_init)(void *si)
@@ -55,6 +57,7 @@ BCMATTACHFN(nvram_init)(void *si)
vars = new;
bcopy((char *)(&nvh[1]), new->vars, nvs);
+ fixup_mac_addr(new);
return 0;
}
@@ -164,3 +167,65 @@ nvram_getall(char *buf, int count)
*buf = '\0';
return 0;
}
+
+static bool nvram_is_valid_mac(struct ether_addr *mac)
+{
+ return mac && !(mac->octet[0] == 0x00 && mac->octet[1] == 0x90 && mac->octet[2] == 0x4c);
+}
+
+static int nvram_increase_mac_addr(struct ether_addr *mac, u8 num)
+{
+ u8 *oui = mac->octet + ETHER_ADDR_LEN/2 - 1;
+ u8 *p = mac->octet + ETHER_ADDR_LEN - 1;
+
+ do {
+ (*p) += num;
+ if (*p > num)
+ break;
+ p--;
+ num = 1;
+ } while (p != oui);
+
+ if (p == oui) {
+ pr_err("unable to fetch mac address\n");
+ return -ENOENT;
+ }
+ return 0;
+}
+
+static void nvram_change_mac_addr(vars_t *new, struct ether_addr *valid, const char *name)
+{
+ char *macaddr_c;
+ struct ether_addr macaddr;
+
+ macaddr_c = findvar(new->vars, new->vars + new->size, name);
+ if (!macaddr_c)
+ return;
+
+ bcm_ether_atoe(macaddr_c, &macaddr);
+ if (nvram_is_valid_mac(&macaddr))
+ return;
+ nvram_increase_mac_addr(valid, 1);
+ bcm_ether_ntoa(valid, macaddr_c);
+}
+
+static void fixup_mac_addr(vars_t *new)
+{
+ char *macaddr_base_c;
+ struct ether_addr macaddr_base;
+
+ macaddr_base_c = findvar(new->vars, new->vars + new->size, "et0macaddr");
+ if (!macaddr_base_c)
+ return;
+
+ bcm_ether_atoe(macaddr_base_c, &macaddr_base);
+ if (!nvram_is_valid_mac(&macaddr_base))
+ return;
+
+ /* jump over the first free address so it can be used for wan */
+ nvram_increase_mac_addr(&macaddr_base, 1);
+ nvram_change_mac_addr(new, &macaddr_base, "pci/1/1/macaddr");
+ nvram_change_mac_addr(new, &macaddr_base, "pci/1/2/macaddr");
+ nvram_change_mac_addr(new, &macaddr_base, "pci/2/1/macaddr");
+ nvram_change_mac_addr(new, &macaddr_base, "sb/1/macaddr");
+}